improve build.sh

Regressed when -Wundef was added

Fixes #210

.github/multiwrapper

@@ -0,0 +1,9 @@
+#!/bin/sh
+
+# symlink this to dropbear/dbclient/dropbearkey next to dropbearmulti
+# good enough for testing purposes.
+
+DIR=$(dirname $0)
+PROG=$(basename $0)
+exec $DIR/dropbearmulti $PROG "$@"
+

.github/workflows/autoconf.yml

@@ -0,0 +1,25 @@
+# Checks that autoconf has been run if configure.ac was updated
+# Assumes that autoconf 2.71 was run, the same as ubuntu 22.04
+name: Autoconf Up To Date
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  autoconf:
+    runs-on: 'ubuntu-22.04'
+
+    steps:
+      - name: deps
+        run: |
+          sudo apt-get -y update
+          sudo apt-get -y install autoconf
+
+      - uses: actions/checkout@v4
+
+      - name: run autoconf
+        run: autoconf && autoheader
+
+      - name: check no difference
+        run: git diff --exit-code

.github/workflows/build.yml

@@ -0,0 +1,290 @@
+# Can be used locally with https://github.com/nektos/act
+# Note the XXX line below.
+
+name: BuildTest
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  build:
+    runs-on: ${{ matrix.os || 'ubuntu-22.04' }}
+    strategy:
+      matrix:
+        # XXX uncomment the line below to work with act, see https://github.com/nektos/act/issues/996
+        # name: []
+
+        # Rather than a boolean False we use eg
+        #   runcheck: 'no'
+        # Otherwise GH expressions will make a None var
+        # compare with False. We want an undefined default of True.
+
+        # MULTI and NOWRITEV are passed as integers to the build
+        include:
+          - name: plain linux
+
+          - name: multi binary
+            multi: 1
+            multilink: 1
+
+          - name: multi binary, dropbearmulti argv0
+            multi: 1
+            multiwrapper: 1
+
+          - name: client only
+            runcheck: 'no'
+            make_target: PROGRAMS=dbclient
+
+          - name: server only
+            runcheck: 'no'
+            make_target: PROGRAMS=dropbear
+
+          - name: bundled libtom, bionic , no writev()
+            # test can use an older distro with bundled libtommath
+            os: ubuntu-20.04
+            configure_flags: --enable-bundled-libtom --enable-werror
+            # NOWRITEV is unrelated, test here to save a job
+            nowritev: 1
+            # our tests expect >= python3.7
+            runcheck: 'no'
+
+          - name: linux clang
+            cc: clang
+
+          # Some platforms only have old compilers, we try to keep
+          # compatibilty. For some reason -std=c89 doesn't enforce
+          # early declarations so we specify it anyway.
+          - name: c89
+            extracflags: -std=c89 -Wdeclaration-after-statement
+            # enable all options
+            nondefault: 1
+            configure_flags: --enable-pam
+
+          - name: macos 14
+            os: macos-14
+            cc: clang
+            # OS X says daemon() and utmp are deprecated.
+            # OS X tests for undefined TARGET_OS_EMBEDDED in libc headers
+            extracflags: -Wno-deprecated-declarations -Wno-undef
+            runcheck: 'no'
+            apt: 'no'
+            # fails with:
+            # .../ranlib: file: libtomcrypt.a(cbc_setiv.o) has no symbols
+            ranlib: ranlib -no_warning_for_no_symbols
+
+          - name: macos 12
+            os: macos-12
+            cc: clang
+            # OS X says daemon() and utmp are deprecated.
+            # OS X tests for undefined TARGET_OS_EMBEDDED in libc headers
+            extracflags: -Wno-deprecated-declarations -Wno-undef
+            runcheck: 'no'
+            apt: 'no'
+            # fails with:
+            # .../ranlib: file: libtomcrypt.a(cbc_setiv.o) has no symbols
+            ranlib: ranlib -no_warning_for_no_symbols
+
+          # Check that debug code doesn't bitrot
+          - name: DEBUG_TRACE
+            nondefault: 1
+            configure_flags: --enable-pam
+            localoptions: |
+              #define DEBUG_TRACE 5
+
+          # Check off-by-default options don't bitrot
+          - name: nondefault options
+            nondefault: 1
+            configure_flags: --enable-pam
+
+          - name: most options disabled
+            configure_flags: --disable-harden --disable-zlib --disable-openpty --disable-lastlog
+            runcheck: 'no'
+            localoptions: |
+              #define DROPBEAR_RSA 0
+              #define INETD_MODE 0
+              #define DROPBEAR_REEXEC 0
+              #define DROPBEAR_SMALL_CODE 0
+              #define DROPBEAR_CLI_LOCALTCPFWD 0
+              #define DROPBEAR_CLI_REMOTETCPFWD 0
+              #define DROPBEAR_SVR_LOCALTCPFWD 0
+              #define DROPBEAR_SVR_REMOTETCPFWD 0
+              #define DROPBEAR_SVR_AGENTFWD 0
+              #define DROPBEAR_CLI_AGENTFWD 0
+              #define DROPBEAR_CLI_PROXYCMD 0
+              #define DROPBEAR_USER_ALGO_LIST 0
+              #define DROPBEAR_AES128 0
+              #define DROPBEAR_AES256 0
+              #define DROPBEAR_ENABLE_CTR_MODE 0
+              #define DROPBEAR_SHA1_HMAC 0
+              #define DROPBEAR_SHA2_256_HMAC 0
+              #define DROPBEAR_RSA 0
+              #define DROPBEAR_ECDSA 0
+              #define DROPBEAR_SK_KEYS 0
+              #define DROPBEAR_DELAY_HOSTKEY 0
+              #define DROPBEAR_DH_GROUP14_SHA1 0
+              #define DROPBEAR_DH_GROUP14_SHA256 0
+              #define DROPBEAR_ECDH 0
+              #define DROPBEAR_DH_GROUP1_CLIENTONLY 0
+              #define DO_MOTD 0
+              #define DROPBEAR_SVR_PUBKEY_AUTH 0
+              #define DROPBEAR_CLI_PASSWORD_AUTH 0
+              #define DROPBEAR_CLI_PUBKEY_AUTH 0
+              #define DROPBEAR_USE_PASSWORD_ENV 0
+              #define DROPBEAR_SFTPSERVER 0
+
+          - name: other algo combos
+            runcheck: 'no'
+            # disables all sha1
+            localoptions: |
+              #define DROPBEAR_SHA1_HMAC 0
+              #define DROPBEAR_RSA_SHA1 0
+              #define DROPBEAR_DH_GROUP14_SHA1 0
+              #define DROPBEAR_ECDSA 0
+              #define DROPBEAR_ED25519 0
+              #define DROPBEAR_SK_KEYS 0
+              #define DROPBEAR_ENABLE_GCM_MODE 1
+              #define DROPBEAR_3DES 1
+              #define DROPBEAR_DH_GROUP16 1
+              #define DROPBEAR_SHA2_512_HMAC 1
+              #define DROPBEAR_CLI_PUBKEY_AUTH 0
+
+          # # Fuzzers run standalone. A bit superfluous with cifuzz, but
+          # # good to run the whole corpus to keep it working.
+          # - name: fuzzing with address sanitizer
+          #   configure_flags: --enable-fuzz --disable-harden --enable-bundled-libtom --enable-werror
+          #   ldflags: -fsanitize=address
+          #   extracflags: -fsanitize=address
+          #   # -fsanitize=address prevents aslr, don't test it
+          #   pytest_addopts: -k "not aslr"
+          #   fuzz: True
+          #   cc: clang
+
+          # # Undefined Behaviour sanitizer
+          # - name: fuzzing with undefined behaviour sanitizer
+          #   configure_flags: --enable-fuzz --disable-harden --enable-bundled-libtom --enable-werror
+          #   ldflags: -fsanitize=undefined
+          #   # don't fail with alignment due to https://github.com/libtom/libtomcrypt/issues/549
+          #   extracflags: -fsanitize=undefined -fno-sanitize-recover=undefined -fsanitize-recover=alignment
+          #   pytest_addopts: -k "not aslr"
+          #   fuzz: True
+          #   cc: clang
+
+    env:
+      MULTI: ${{ matrix.multi }}
+      CC: ${{ matrix.cc || 'gcc' }}
+      LDFLAGS: ${{ matrix.ldflags }}
+      EXTRACFLAGS: ${{ matrix.extracflags }}
+      CONFIGURE_FLAGS: ${{ matrix.configure_flags || '--enable-werror' }}
+      MAKE_TARGET: ${{ matrix.make_target }}
+      # for fuzzing
+      CXX: clang++
+      RANLIB: ${{ matrix.ranlib || 'ranlib' }}
+      # pytest in "make check" recognises this for extra arguments
+      PYTEST_ADDOPTS: ${{ matrix.pytest_addopts }}
+      # some pytests depend on special setup from this file. see authorized_keys below.
+      DBTEST_IN_ACTION: true
+      LOCALOPTIONS: ${{ matrix.localoptions }}
+
+    steps:
+      - name: deps
+        if: ${{ matrix.apt != 'no' }}
+        run: |
+          sudo apt-get -y update
+          sudo apt-get -y install zlib1g-dev libtomcrypt-dev libtommath-dev mercurial python3-venv libpam0g-dev $CC
+
+      - uses: actions/checkout@v4
+
+      - name: configure
+        run: ./configure $CONFIGURE_FLAGS CFLAGS="-O2 -Wall -Wno-pointer-sign $EXTRACFLAGS" --prefix="$HOME/inst" || (cat config.log; exit 1)
+
+      - name: nowritev
+        if: ${{ matrix.nowritev }}
+        run: sed -i -e s/HAVE_WRITEV/DONT_HAVE_WRITEV/ config.h
+
+      - name: localoptions
+        run: |
+          echo "$LOCALOPTIONS" | tee localoptions.h
+
+      - name: nondefault
+        if: ${{ matrix.nondefault }}
+        run: |
+          # Turn on anything that's off by default. Rough but seems sufficient
+          grep ' 0$' src/default_options.h | sed 's/0$/1/' > localoptions.h
+          # PAM clashes with password
+          echo "#define DROPBEAR_SVR_PASSWORD_AUTH 0" >> localoptions.h
+          # 1 second timeout is too short
+          sed -i "s/DEFAULT_IDLE_TIMEOUT 1/DEFAULT_IDLE_TIMEOUT 99/" localoptions.h
+
+      - name: make
+        run: |
+          cat localoptions.h
+          make -j3 $MAKE_TARGET
+
+      - name: multilink
+        if: ${{ matrix.multilink }}
+        run: make multilink
+
+      - name: multi wrapper script
+        if: ${{ matrix.multiwrapper }}
+        run: |
+          cp .github/multiwrapper dropbear
+          cp .github/multiwrapper dbclient
+          cp .github/multiwrapper dropbearkey
+          cp .github/multiwrapper dropbearconvert
+
+      - name: makefuzz
+        run: make fuzzstandalone
+        if: ${{ matrix.fuzz }}
+
+        # avoid concurrent install, osx/freebsd is racey (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208093)
+      - name: make install
+        run: make install
+
+      - name: keys
+        if: ${{ matrix.runcheck != 'no' }}
+        run: |
+          mkdir -p ~/.ssh
+          # remove old files so we can rerun in-place with "act -r" during test development
+          rm -vf ~/.ssh/id_dropbear*
+          ~/inst/bin/dropbearkey -t ecdsa -f ~/.ssh/id_dropbear | grep ^ecdsa > ~/.ssh/authorized_keys
+
+          # to test setting SSH_PUBKEYINFO, replace the trailing comment
+          ~/inst/bin/dropbearkey -t ecdsa -f ~/.ssh/id_dropbear_key2 | grep ^ecdsa | sed 's/[^ ]*$/key2 extra/' >> ~/.ssh/authorized_keys
+          ~/inst/bin/dropbearkey -t ecdsa -f ~/.ssh/id_dropbear_key3 | grep ^ecdsa | sed 's/[^ ]*$/key3%char/' >> ~/.ssh/authorized_keys
+          ~/inst/bin/dropbearkey -t ecdsa -f ~/.ssh/id_dropbear_key4 | grep ^ecdsa | sed 's/[^ ]*$/key4,char/' >> ~/.ssh/authorized_keys
+          chmod 700 ~ ~/.ssh ~/.ssh/authorized_keys
+          ls -ld ~ ~/.ssh ~/.ssh/authorized_keys
+
+        # upload config.log if something has failed
+      - name: config.log
+        if: ${{ !env.ACT && (failure() || cancelled()) }}
+        uses: actions/upload-artifact@v2
+        with:
+          name: config.log
+          path: config.log
+
+      - name: check
+        if: ${{ matrix.runcheck != 'no' }}
+        run: make check
+
+      # Sanity check that the binary runs
+      - name: genrsa
+        if: ${{ matrix.runcheck != 'no' }}
+        run: ~/inst/bin/dropbearkey -t rsa -f testrsa
+      - name: genecdsa256
+        if: ${{ matrix.runcheck != 'no' }}
+        run: ~/inst/bin/dropbearkey -t ecdsa -f testec256 -s 256
+      - name: genecdsa384
+        if: ${{ matrix.runcheck != 'no' }}
+        run: ~/inst/bin/dropbearkey -t ecdsa -f testec384 -s 384
+      - name: genecdsa521
+        if: ${{ matrix.runcheck != 'no' }}
+        run: ~/inst/bin/dropbearkey -t ecdsa -f testec521 -s 521
+      - name: gened25519
+        if: ${{ matrix.runcheck != 'no' }}
+        run: ~/inst/bin/dropbearkey -t ed25519 -f tested25519
+
+      - name: fuzz
+        if: ${{ matrix.fuzz }}
+        run: ./fuzzers_test.sh

.github/workflows/cifuzz.yml

@@ -0,0 +1,30 @@
+# Runs fuzzers for a little while on pull requests.
+# From https://google.github.io/oss-fuzz/getting-started/continuous-integration/
+name: CIFuzz
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  Fuzzing:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Build Fuzzers
+      id: build
+      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'dropbear'
+        dry-run: false
+    - name: Run Fuzzers
+      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
+      with:
+        oss-fuzz-project-name: 'dropbear'
+        fuzz-seconds: 1200
+        dry-run: false
+    - name: Upload Crash
+      uses: actions/upload-artifact@v4
+      if: failure() && steps.build.outcome == 'success'
+      with:
+        name: artifacts
+        path: ./out/artifacts

.github/workflows/outoftree.yml

@@ -0,0 +1,25 @@
+# Can be used locally with https://github.com/nektos/act
+
+name: Out of tree build
+on:
+  pull_request:
+  push:
+    branches:
+      - master
+jobs:
+  outoftree:
+    runs-on: 'ubuntu-22.04'
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: build
+        run: |
+          mkdir build
+          cd build
+          ../configure --enable-fuzz --enable-bundled-libtom --prefix=$PWD/inst
+          make -j3
+          make -j3 fuzzstandalone
+          make install
+          test -x inst/bin/dbclient
+          test -f inst/share/man/man8/dropbear.8

.github/workflows/tarball.yml

@@ -0,0 +1,36 @@
+name: tarball sha256sum
+on:
+  push:
+    branches:
+      - master
+jobs:
+  tarball:
+    runs-on: 'ubuntu-22.04'
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: release.sh
+        run: ./release.sh --testrel | tee log1.txt
+
+      - name: extract output
+        run: |
+          grep ^SHA256 log1.txt | tee sha256sum.txt
+          sed 's/.*= *//' < sha256sum.txt > hash.txt
+          mv `tail -n1 log1.txt` rel.tar.bz2
+
+      - name: sha256sum
+        uses: actions/upload-artifact@v4
+        with:
+          name: sha256sum
+          path: |
+            sha256sum.txt
+            hash.txt
+
+      - name: tarball
+        uses: actions/upload-artifact@v4
+        with:
+          name: tarball
+          # only keep for debugging
+          retention-days: 3
+          path: rel.tar.bz2

.gitignore

@@ -5,6 +5,8 @@
 *.bb
 *.bbg
 *.prof
+.*.swp
+/obj
 /autom4te.cache
 /config.log
 /config.status
@@ -13,10 +15,19 @@
 /dropbearconvert
 /dropbearkey
 /dropbearmulti
+/fuzzcorpus
+/fuzzer-*
+/fuzzer-*.options
 /scp
 /scp-progress
-Makefile
 config.h
-config.h.in
-configure
 default_options_guard.h
+localoptions.h
+Makefile
+tags
+.pytest*
+*.pyc
+/test/venv/
+/test/init/
+/test/fakekey
+.vscode/

.hgsigs

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.hgtags

@@ -1,57 +0,0 @@
-03f65e461915a940939e4cc689fc89721ffc40de DROPBEAR_0.48.1
-0f967bfef5cd0056b7ec60e2305d917e51cbf30d DROPBEAR_0.44
-170329dc8ce5dfcf6298e1ad6699f109bf78e73d DROPBEAR_0.51
-1dbd2473482f320ea59f76ce961385cb3a0150a9 DROPBEAR_0.46
-2098857ab826dd42ae05a9a22c3ce2cc835b9844 DROPBEAR_0.45
-36160290a1b27451178be36752ed038840f59cdd LTC_DB_0.46
-39d5d58461d6e93337636e69d4cdf184a09c8d24 LTC_1.05
-55a99934db873be2e63b5968fb6532e5d9bd02e4 DROPBEAR_0.48
-59400faa4b44708c5d0b595e81193bc621e752d3 libtomcrypt-1.05
-66087d87c3555c78b47cf01f32bb5a32054c3ceb DROPBEAR_0.44test4
-677843bfa734238a67636b461a02c110c462ffaf DROPBEAR_0.44test1
-7faae8f46238e23975430876547b8950b4e75481 t:ltc-0.95-orig
-8220862baae829ebc762587b99c662480d57bb23 DROPBEAR_0.53
-86e0b50a9b588239c3fc9cc9cfe255ef586df17b ltm-0.30-orig
-88e0a1ad951add46b795511dc2698e36b4aee922 DROPBEAR_0.44test3
-8e94663164c6e106ccc5c9e997dedf6e04d77dd2 LTM_DB_0.44
-91fbc376f01084037cd5f6a5bf2e2db4903e8e99 libtommath-0.35
-97db060d0ef5f8cf8e67eb602ef037055a185ca9 libtommath-0.40
-aa2f51a6b81d33de5e9898a7f27c792a173d9b26 DROPBEAR_0.53.1
-ab370c629d363f8c9a3eca512bfa86e362034654 DROPBEAR_0.49
-c2ac796b130eeb6fa840873d8c230544c8ec7e4b DROPBEAR_0.44test2
-cd1143579f00b0248c79f63ca70efee4a35a57e8 LTC_DB_0.44
-ce104c8b0be1ff3f2c2590b7cdc3fd6870c865cd DROPBEAR_0.52
-d5faf4814ddbc5abd9e209409bb9e7a4686c8cd7 libtomcrypt-1.16
-d7da3b1e15401eb234ec866d5eac992fc4cd5878 t:ltc-0.95-db-merge1
-d8254fc979e99560c93ca2cece77a6df31927ea5 LTM_0.35
-e109027b9edfb02f0bdf96ec45bb1cd9ad41e7da LTM_DB_0.46
-e109027b9edfb02f0bdf96ec45bb1cd9ad41e7da LTM_DB_0.47
-e37b160c414cab6466622f63b0c4dcbf6ebc47a9 DROPBEAR_0.47
-e430a26064ee86ab79aef372118d6d03b2441996 DROPBEAR_0.50
-e5d119ea4c63656bc54ecfd865d04591ac2ed225 LTC_DB_0.47
-3f12086c2ef2b9ffe36a822fdb3ff647fcec1831 DROPBEAR_2011.54
-d354464b2aa6f6ba0bf44d43bcae5aa798435393 DROPBEAR_2012.55
-7faae8f46238e23975430876547b8950b4e75481 t:ltc-0.95-orig
-0000000000000000000000000000000000000000 t:ltc-0.95-orig
-d7da3b1e15401eb234ec866d5eac992fc4cd5878 t:ltc-0.95-db-merge1
-0000000000000000000000000000000000000000 t:ltc-0.95-db-merge1
-1b8b2b9d6e94bc3cc5e61b620476ea36cc466e1b DROPBEAR_2013.56
-96b8bcb88017815040949a417caa55686271e8a9 DROPBEAR_2013.57
-e76614145aea67f66e4a4257685c771efba21aa1 DROPBEAR_2013.58
-7b68e581985fd4ea50869f8608ab95cda5d17876 DROPBEAR_2013.59
-a50a1dc743317fad9b3737bc68fbca640659bb6d DROPBEAR_2013.60
-e894dbc015ba7ff4c3bf897ee20e28ca90c55a16 DROPBEAR_2013.61test
-3d1d7d151c0ce3a79da62e86463f5632fa2b144a DROPBEAR_2013.62
-2351b2da8e0d08dcc6e64fcc328b53b9630bda68 DROPBEAR_2014.63
-0d2d39957c029adb7f4327d37fe6b4900f0736d9 DROPBEAR_2014.64
-e9579816f20ea85affc6135e87f8477992808948 DROPBEAR_2014.65
-735511a4c761141416ad0e6728989d2dafa55bc2 DROPBEAR_2014.66
-cbd674d63cd4f3781464a8d4056a5506c8ae926f DROPBEAR_2015.67
-809feaa9408f036734129c77f2b3c7e779d4f099 DROPBEAR_2015.68
-1637dbd262124d113e52967df46afd6c715e4fad DROPBEAR_2015.69
-79a6ef02307d05cb9dda10465cb5b807baa8f62e DROPBEAR_2015.70
-9a944a243f08be6b22d32f166a0690eb4872462b DROPBEAR_2015.71
-78b12b6549be08b0bea3da329b2578060a76ca31 DROPBEAR_2016.72
-309e1c4a87682b6ca7d80b8555a1db416c3cb7ac DROPBEAR_2016.73
-0ed3d2bbf956cb8a9bf0f4b5a86b7dd9688205cb DROPBEAR_2016.74
-c31276613181c5cff7854e7ef586ace03424e55e DROPBEAR_2017.75

.travis.yml

@@ -1,56 +0,0 @@
-language: c
-
-git:
-  depth: 3
-
-matrix:
-  include:
-    # subsequent matrix options use these first settings
-    - os: linux
-      compiler: gcc
-      env: WEXTRAFLAGS=-Werror
-    - env: MULTI=1 WEXTRAFLAGS=-Werror
-    # libtom has some warnings, so no WEXTRAFLAGS
-    - env: BUNDLEDLIBTOM=--enable-bundled-libtom WEXTRAFLAGS=""
-    - env: NOWRITEV=1 WEXTRAFLAGS=-Werror
-    # libtomcrypt 1.18.1 fixes clang problems, distro doesn't have that yet
-    - os: linux
-      compiler: clang
-      env: BUNDLEDLIBTOM=--enable-bundled-libtom WEXTRAFLAGS=""
-    - os: osx
-      compiler: clang
-      env: WEXTRAFLAGS=""
-
-# container-based builds
-sudo: false
-addons:
-  apt:
-    packages:
-    # packages list: https://github.com/travis-ci/apt-package-whitelist/blob/master/ubuntu-precise
-    - zlib1g-dev
-    - libtomcrypt-dev
-    - libtommath-dev
-
-
-before_install:
-  - if [ "$CC" = "clang" ]; then WEXTRAFLAGS="$WEXTRAFLAGS -Wno-error=incompatible-library-redeclaration" ; fi  # workaround
-
-script:
-  - autoconf && autoheader && ./configure "$BUNDLEDLIBTOM" CFLAGS="-O2 -Wall -Wno-pointer-sign $WEXTRAFLAGS" --prefix="$HOME/inst"
-  - if [ "$NOWRITEV" = "1" ]; then sed -i -e s/HAVE_WRITEV/DONT_HAVE_WRITEV/ config.h ; fi
-  - make -j3 
-  # avoid concurrent install, osx/freebsd is racey (https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=208093)
-  - make install 
-
-after_success:
-  - ~/inst/bin/dropbearkey -t rsa -f testrsa
-  - ~/inst/bin/dropbearkey -t dss -f testdss
-  - ~/inst/bin/dropbearkey -t ecdsa -f testec256 -s 256
-  - ~/inst/bin/dropbearkey -t ecdsa -f testec384 -s 384
-  - ~/inst/bin/dropbearkey -t ecdsa -f testec521 -s 521
-
-branches:
-  only:
-    - master
-    - coverity
-

CHANGES

@@ -1,13 +1,494 @@
+2024.85 - 25 April 2024
+
+  This release fixes build regressions in 2024.84
+
+- Fix build failure when SHA1 is disabled, thanks to Peter Krefting
+
+- Fix build failure when DROPBEAR_CLI_PUBKEY_AUTH disabled, thanks to
+  Sergey Ponomarev
+
+- Update debian/ directory with changed paths
+
+2024.84 - 4 April 2024
+
+Features and Changes:
+  Note >> for compatibility/configuration changes
+
+- >> Only use /etc/shadow when a user has :x: as the crypt in /etc/passwd.
+  This is the documented behaviour of passwd(5) so should be consistent with
+  other programs. Thanks to Paulo Cabral for the report.
+  Note that any users without x as the crypt will not be able
+  to log in with /etc/shadow, in cases were the existing configuration
+  differs.
+
+- Support -o StrictHostKeyChecking, patch from Sergey Ponomarev
+
+- Support -o BatchMode, from Sergey Ponomarev and Hans Harder
+
+- Support various other -o options compatible with OpenSSH, from
+  Sergey Ponomarev. Includes -o PasswordAuthentication
+
+- Add dbclient config file support, ~/.ssh/dropbear_config
+  Thanks to tjkolev
+  Disabled by default, set #define DROPBEAR_USE_SSH_CONFIG 1
+
+- Add support for unix socket forwarding (destination) on
+  the server, thanks to WangYi for the implementation
+
+- Add option to bind to interface, from Diederik De Coninck
+
+- Ignore unsupported arguments in dropbearkey, allow running
+  binary as 'ssh-key'. From Sergey Ponomarev
+
+- Save a public key file on generation with dropbearkey.
+  -C can be used for a comment, and choose a default key
+  type (ed25519 first preference).
+  Thanks to Sergey Ponomarev
+
+- Allow inetd to run in non-syslog modes. Thanks to Laurent Bercot
+  for the report
+
+- Allow user's own gid in PTY permissions, lets Dropbear work as non-root
+  even if /dev/pts isn't mounted with gid=5
+
+- src/distrooptions.h can now be used as another config file.
+  This can be used by distributions for customisations (separate
+  to the build directory's localoptions.h)
+
+Fixes:
+
+- "dbclient host >> output" would previously overwrite "output", instead of
+  appending. Thanks for the report from eSotoIoT
+
+- Add "Strict KEX" support. This mitigates a SSH protocol flaw which lets
+  a MITM attacker silently remove packets immediately after the
+  first key exchange. At present the flaw does not seem to reduce Dropbear's
+  security (the only packet affected would be a server-sig-algs extension,
+  which is used for compatibility not security).
+  For Dropbear, chacha20-poly1305 is the only affected cipher.
+  Both sides of the connection must support Strict KEX for it to be used.
+
+  The protocol flaw is tracked as CVE-2023-48795, details
+  at https://terrapin-attack.com . Thanks to the researchers Fabian Bäumer,
+  Marcus Brinkmann, and Jörg Schwenk. Thanks to OpenSSH for specifying
+  strict KEX mode.
+
+- Fix blocking while closing forwarded TCP sessions. Noticable
+  when many connections are being forwarded. Reported and
+  tested by GektorUA. Github #230
+
+- Don't offer RSA (then fail) if there is no RSA key. Regression in 2020.79
+  Github #219
+
+- Fix missing response to remote TCP requests when it is disabled.
+  Patch from Justin Chen. Github #254
+
+- Fix building with DROPBEAR_RSA disabled
+
+- /proc/timer_list is no longer used for entropy, it was a bottleneck.
+  Thanks to Aleksei Plotnikov for the report.
+
+- Don't unconditionally enable DROPBEAR_DSS
+
+- Make banner reading failure non-fatal
+
+- Fix DROPBEAR_SVR_MULTIUSER. This appears to have been broken since when it
+  was added in 2019. If you're using this let me know (it might be removed
+  if I don't hear otherwise). Thanks to davidatrsp
+
+- Fix Y2038 issues
+
+Infrastructure:
+
+- Move source files to src/ subdirectory. Thanks to tjkolev
+
+- Remove more files with "make distclean"
+
+- Add tests for disabled options
+
+2022.83 - 14 November 2022
+
+Features and Changes:
+  Note >> for compatibility/configuration changes
+
+- >> Disable DROPBEAR_DSS by default
+  It is only 1024 bit and uses sha1, most distros disable it by default already.
+
+- Added DROPBEAR_RSA_SHA1 option to allow disabling sha1 rsa signatures.
+  >> RSA with sha1 will be disabled in a future release (rsa keys will continue
+  to work OK, with sha256 signatures used instead).
+
+- Add option for requiring both password and pubkey (-t)
+  Patch from Jackkal
+
+- Add 'no-touch-required' and 'verify-required' options for sk keys
+  Patch from Egor Duda
+
+  - >> DROPBEAR_SK_KEYS config option now replaces separate DROPBEAR_SK_ECDSA
+  and DROPBEAR_SK_ED25519 options.
+
+- Add 'permitopen' option for authorized_keys to restrict forwarded ports
+  Patch from Tuomas Haikarainen
+
+- >> Added LTM_CFLAGS configure argument to set flags for building
+  bundled libtommath. This also restores the previous arguments used
+  in 2020.81 (-O3 -funroll-loops). That gives a big speedup for RSA
+  key generation, which regressed in 2022.82.
+  There is a tradeoff with code size, so -Os can be used if required.
+  https://github.com/mkj/dropbear/issues/174
+  Reported by David Bernard
+
+- Add '-z' flag to disable setting QoS traffic class. This may be necessary
+  to work with broken networks or network drivers, exposed after changes to use
+  AF21 in 2022.82
+  https://github.com/mkj/dropbear/issues/193
+  Reported by yuhongwei380, patch from Petr Štetiar
+
+- Allow overriding user shells with COMPAT_USER_SHELLS
+  Based on a patch from Matt Robinson
+
+- Improve permission error message
+  Patch from k-kurematsu
+
+- >> Remove HMAC_MD5 entirely
+
+Regression fixes from 2022.82:
+
+- Fix X11 build
+
+- Fix build warning
+
+- Fix compilation when disabling pubkey authentication
+  Patch from MaxMougg
+
+- Fix MAX_UNAUTH_CLIENTS regression
+  Reported by ptpt52
+
+- Avoid using slower prime testing in bundled libtomcrypt when DSS is disabled
+  https://github.com/mkj/dropbear/issues/174
+  Suggested by Steffen Jaeckel
+
+- Fix Dropbear plugin support
+  https://github.com/mkj/dropbear/issues/194
+  Reported by Struan Bartlett
+
+Other fixes:
+
+- Fix long standing incorrect compression size check. Dropbear
+  (client or server) would erroneously exit with
+  "bad packet, oversized decompressed"
+  when receiving a compressed packet of exactly the maximum size.
+
+- Fix missing setsid() removed in 2020.79
+  https://github.com/mkj/dropbear/issues/180
+  Reported and debugged by m5jt and David Bernard
+
+- Try keyboard-interactive auth before password, in dbclient.
+  This was unintentionally changed back in 2013
+  https://github.com/mkj/dropbear/pull/190
+  Patch from Michele Giacomoli
+
+- Drain the terminal when reading the fingerprint confirmation response
+  https://github.com/mkj/dropbear/pull/191
+  Patch from Michele Giacomoli
+
+- Fix utx wtmp variable typo. This has been wrong for a long time but
+  only recently became a problem when wtmp was detected.
+  https://github.com/mkj/dropbear/pull/189
+  Patch from Michele Giacomoli
+
+- Improve configure test for hardening options.
+  Fixes building on AIX
+  https://github.com/mkj/dropbear/issues/158
+
+- Fix debian/dropbear.init newline
+  From wulei-student
+
+Infrastructure:
+
+- Test off-by-default compile options
+
+- Set -Wundef to catch typos in #if statements
+
+
+2022.82 - 1 April 2022
+
+Features and Changes:
+  Note >> for compatibility/configuration changes
+
+- Implemented OpenSSH format private key handling for dropbearconvert.
+  Keys can be read in OpenSSH format or the old PEM format.
+  >> Keys are now written in OpenSSH format rather than PEM.
+  ED25519 support is now correct. DSS keys are still PEM format.
+
+- Use SHA256 for key fingerprints
+
+- >> Reworked -v verbose printing, specifying multiple times will increase
+  verbosity. -vvvv is equivalent to the old DEBUG_TRACE -v level, it
+  can be configured at compile time in localoptions.h (see default_options.h)
+  Lower -v options can be used to check connection progress or algorithm
+  negotiation.
+  Thanks to Hans Harder for the implementation
+
+  localoptions.h DEBUG_TRACE should be set to 4 for the same result as the
+  previous DEBUG_TRACE 1.
+
+- Added server support for U2F/FIDO keys (ecdsa-sk and ed25519-sk) in
+  authorized_keys. no-touch-required option isn't allowed yet.
+  Thanks to Egor Duda for the implementation
+
+- autoconf output (configure script etc) is now committed to version control.
+  >> It isn't necessary to run "autoconf" any more on a checkout.
+
+- sha1 will be omitted from the build if KEX/signing/MAC algorithms don't
+  require it. Instead sha256 is used for random number generation.
+  See sysoptions.h to see which algorithms require which hashes.
+
+- Set SSH_PUBKEYINFO environment variable based on the authorized_keys
+  entry used for auth. The first word of the comment after the key is used
+  (must only have characters a-z A-Z 0-9 .,_-+@)
+  Patch from Hans Harder, modified by Matt Johnston
+
+- Let dbclient multihop mode be used with '-J'.
+  Patch from Hans Harder
+
+- Allow home-directory relative paths ~/path for various settings
+  and command line options.
+  *_PRIV_FILENAME DROPBEAR_PIDFILE SFTPSERVER_PATH MOTD_FILENAME
+  Thanks to Begley Brothers Inc
+
+  >> The default DROPBEAR_DEFAULT_CLI_AUTHKEY has now changed, it now needs
+  a tilde prefix.
+
+- LANG environment variable is carried over from the Dropbear server process
+  From Maxim Kochetkov
+
+- Add /usr/sbin and /sbin to $PATH when logging in as root.
+  Patch from Raphaël Hertzog
+  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=903403
+
+- Added client option "-o DisableTrivialAuth". It disallows a server immediately
+  giving successful authentication (without presenting any password/pubkey prompt).
+  This avoids a UI confusion issue where it may appear that the user is accepting
+  a SSH agent prompt from their local machine, but are actually accepting a prompt
+  sent immediately by the remote server. 
+  CVE-2021-36369 though the description there is a bit confused. It only applies
+  to Dropbear as a client.
+  Thanks to Manfred Kaiser from Austrian MilCERT
+
+- Add -q client option to hide remote banner, from Hans Harder
+
+- Add -e option to pass all server environment variables to child processes.
+  This should be used with caution.
+  Patch from Roland Vollgraf (github #118)
+
+- >> Use DSCP for QoS traffic classes. Priority (tty) traffic is now set to
+  AF21 "interactive". Previously TOS classes were used, they are not used by
+  modern traffic classifiers. Non-tty traffic is left at default priority.
+
+- >> Disable dh-group1 key exchange by default. It has been disabled server
+  side by default since 2018.
+
+- >> Removed Twofish cipher
+
+Fixes:
+
+- Fix flushing channel data when pty was allocated (github #85)
+  Data wasn't completely transmitted at channel close.
+  Reported and initial patch thanks to Yousong Zhou
+
+- Dropbear now re-executes itself rather than just forking for each connection
+  (only on Linux). This allows ASLR to randomise address space for each
+  connection as a security mitigation. It should not have any visible impact
+  - if there are any performance impacts in the wild please report it.
+
+- Check authorized_keys permissions as the user, fixes NFS squash root.
+  Patch from Chris Dragan (github #107)
+
+- A missing home directory is now non-fatal, starting in / instead
+
+- Fixed IPv6 [address]:port parsing for dbclient -b
+  Reported by Fabio Molinari
+
+- Improve error logging so that they are logged on the server rather than being
+  sent to the client over the connection
+
+- Max window size is increased to 10MB, more graceful fallback if it's invalid.
+
+- Fix correctness of Dropbear's handling of global requests.
+  Patch from Dirkjan Bussink
+
+- Fix some small bugs found by fuzzers, null pointer dereference crash and leaks
+  (post authentication)
+
+- $HOME variable is used before /etc/passwd when expanding paths such as
+  ~/.ssh/id_dropbear (for the client). Patch from Matt Robinson
+
+- C89 build fixes from Guillaume Picquet
+
+Infrastructure:
+
+- Improvements to fuzzers. Added post-auth fuzzer, and a mutator that can
+  handle the structure of SSH packet streams. Added cifuzz to run on commits
+  and pull requests.
+  Thanks to OSS-Fuzz for the tools/clusters and reward funding.
+
+- Dropbear source tarballs generated by release.sh are now reproducible from a
+  Git or Mercurial checkout, they will be identical on any system. Tested
+  on ubuntu and macos.
+
+- Added some integration testing using pytest. Currently this has tests
+  for various channel handling edge cases, ASLR fork randomisation,
+  dropbearconvert, and SSH_PUBKEYINFO
+
+- Set up github actions. This runs the pytest suite and other checks.
+  - build matrix includes c89, dropbearmulti, bundled libtom, macos, DEBUG_TRACE
+  - test for configure script regeneration
+  - build a tarball for external reproducibility
+
+2020.81 - 29 October 2020
+
+- Fix regression in 2020.79 which prevented connecting with some SSH 
+  implementations. Increase MAX_PROPOSED_ALGO to 50, and print a log 
+  message if the limit is hit. This fixes interoperability with sshj 
+  library (used by PyCharm), and GoAnywhere.
+  Reported by Pirmin Walthert and Piotr Jurkiewicz
+
+- Fix building with non-GCC compilers, reported by Kazuo Kuroi
+
+- Fix potential long delay in dbclient, found by OSS Fuzz
+
+- Fix null pointer dereference crash, found by OSS Fuzz
+
+- libtommath now uses the same random source as Dropbear (in 2020.79 
+  and 2020.80 used getrandom() separately)
+
+- Some fuzzing improvements, start of a dbclient fuzzer
+
+2020.80 - 26 June 2020
+
+- Don't block authorized_keys logins with no-X11-forwarding or no-agent-forwarding 
+  restrictions when X11 or agent forwarding are disabled at compile time.
+  This is more of a problem now X11 is disabled by default, reported by Guilhem Moulin
+
+- Reduce binary size by 4kB (x64) when using bundled libtommath
+
+- Define GNU_SOURCE for getrandom() on uclibc, reported by Laurent Bercot and
+  Fabrice Fontaine
+
+- Improve checking libtomcrypt version compatibility
+
+- Add some style notes to DEVELOPING.md
+
+2020.79 - 15 June 2020
+
+- Support ed25519 hostkeys and authorized_keys, many thanks to Vladislav Grishenko.
+  This also replaces curve25519 with a TweetNaCl implementation that reduces code size.
+
+- Add chacha20-poly1305 authenticated cipher. This will perform faster than AES
+  on many platforms. Thanks to Vladislav Grishenko
+
+- Support using rsa-sha2 signatures. No changes are needed to hostkeys/authorized_keys
+  entries, existing RSA keys can be used with the new signature format (signatures
+  are ephemeral within a session). Old ssh-rsa signatures will no longer
+  be supported by OpenSSH in future so upgrading is recommended.
+
+- Use getrandom() call on Linux to ensure sufficient entropy has been gathered at startup.
+  Dropbear now avoids reading from the random source at startup, instead waiting until
+  the first connection. It is possible that some platforms were running without enough 
+  entropy previously, those could potentially block at first boot generating host keys.
+  The dropbear "-R" option is one way to avoid that.
+
+- Upgrade libtomcrypt to 1.18.2 and libtommath to 1.2.0, many thanks to Steffen Jaeckel for
+  updating Dropbear to use the current API. Dropbear's configure script will check 
+  for sufficient system library versions, otherwise using the bundled versions.
+
+- CBC ciphers, 3DES, hmac-sha1-96, and x11 forwarding are now disabled by default.
+  They can be set in localoptions.h if required.
+  Blowfish has been removed.
+
+- Support AES GCM, patch from Vladislav Grishenko. This is disabled by default,
+  Dropbear doesn't currently use hardware accelerated AES.
+
+- Added an API for specifying user public keys as an authorized_keys replacement.
+  See pubkeyapi.h for details, thanks to Fabrizio Bertocci
+
+- Fix idle detection clashing with keepalives, thanks to jcmathews
+
+- Include IP addresses in more early exit messages making it easier for fail2ban
+  processing. Patch from Kevin Darbyshire-Bryant
+
+- scp fix for CVE-2018-20685 where a server could modify name of output files
+
+- SSH_ORIGINAL_COMMAND is set for "dropbear -c" forced command too
+
+- Fix writing key files on systems without hard links, from Matt Robinson
+
+- Compatibility fixes for IRIX from Kazuo Kuroi
+
+- Re-enable printing MOTD by default, was lost moving from options.h. Thanks to zciendor
+
+- Call fsync() is called on parent directory when writing key files to ensure they are flushed
+
+- Fix "make install" for manpages in out-of-tree builds, from Gabor Z. Papp
+
+- Some notes are added in DEVELOPING.md
+
+2019.78 - 27 March 2019
+
+- Fix dbclient regression in 2019.77. After exiting the terminal would be left
+  in a bad state. Reported by Ryan Woodsmall
+  
+2019.77 - 23 March 2019
+
+- Fix server -R option with ECDSA - only advertise one key size which will be accepted.
+  Reported by Peter Krefting, 2018.76 regression.
+
+- Fix server regression in 2018.76 where multiple client -R forwards were all forwarded 
+  to the first destination. Reported by Iddo Samet.
+
+- Make failure delay more consistent to avoid revealing valid usernames, set server password 
+  limit of 100 characters. Problem reported by usd responsible disclosure team
+
+- Change handling of failed authentication to avoid disclosing valid usernames,
+  CVE-2018-15599. 
+
+- Fix dbclient to reliably return the exit code from the remote server.
+  Reported by W. Mike Petullo
+
+- Fix export of 521-bit ECDSA keys, from Christian Hohnstädt
+
+- Add -o Port=xxx option to work with sshfs, from xcko
+
+- Merged fuzzing code, see FUZZER-NOTES.md
+
+- Add a DROPBEAR_SVR_MULTIUSER=0 compile option to run on 
+  single-user Linux kernels (CONFIG_MULTIUSER disabled). From Patrick Stewart
+
+- Increase allowed username to 100 characters, reported by W. Mike Petullo
+
+- Update config.sub and config.guess, should now work with RISC-V
+
+- Cygwin compile fix from karel-m
+
+- Don't require GNU sed (accidentally in 2018.76), reported by Samuel Hsu
+
+- Fix for IRIX and writev(), reported by Kazuo Kuroi
+
+- Other fixes and cleanups from François Perrad, Andre McCurdy, Konstantin Demin,
+  Michael Jones, Pawel Rapkiewicz
+
+
 2018.76 - 27 February 2018
 
 > > > Configuration/compatibility changes
   IMPORTANT
-  Custom configuration is now specified in local_options.h rather than options.h
+  Custom configuration is now specified in localoptions.h rather than options.h
   Available options and defaults can be seen in default_options.h
 
   To migrate your configuration, compare your customised options.h against the
   upstream options.h from your relevant version. Any customised options should
-  be put in localoptions.h
+  be put in localoptions.h in the build directory.
 
 - "configure --enable-static" should now be used instead of "make STATIC=1"
   This will avoid 'hardened build' flags that conflict with static binaries
@@ -101,7 +582,7 @@
   dropbear is running with -a (Allow connections to forwarded ports from any host)
   This could potentially allow arbitrary code execution as root by an authenticated user.
   Affects versions 2013.56 to 2016.74. Thanks to Mark Shepard for reporting the crash.
-  CVE-2017-9078 https://secure.ucc.asn.au/hg/dropbear/rev/c8114a48837c
+  CVE-2017-9078 https://hg.ucc.asn.au/dropbear/rev/c8114a48837c
 
 - Security: Fix information disclosure with ~/.ssh/authorized_keys symlink.
   Dropbear parsed authorized_keys as root, even if it were a symlink. The fix
@@ -113,7 +594,7 @@
   contents of that file.
   This information disclosure is to an already authenticated user.
   Thanks to Jann Horn of Google Project Zero for reporting this.
-  CVE-2017-9079 https://secure.ucc.asn.au/hg/dropbear/rev/0d889b068123
+  CVE-2017-9079 https://hg.ucc.asn.au/dropbear/rev/0d889b068123
 
 - Generate hostkeys with dropbearkey atomically and flush to disk with fsync
   Thanks to Andrei Gherzan for a patch
@@ -133,23 +614,23 @@
   run arbitrary code as the dbclient user. This could be a problem if scripts
   or webpages pass untrusted input to the dbclient program.
   CVE-2016-7406
-  https://secure.ucc.asn.au/hg/dropbear/rev/b66a483f3dcb
+  https://hg.ucc.asn.au/dropbear/rev/b66a483f3dcb
 
 - Security: dropbearconvert import of OpenSSH keys could run arbitrary code as
   the local dropbearconvert user when parsing malicious key files
   CVE-2016-7407
-  https://secure.ucc.asn.au/hg/dropbear/rev/34e6127ef02e
+  https://hg.ucc.asn.au/dropbear/rev/34e6127ef02e
 
 - Security: dbclient could run arbitrary code as the local dbclient user if
   particular -m or -c arguments are provided. This could be an issue where
   dbclient is used in scripts.
   CVE-2016-7408
-  https://secure.ucc.asn.au/hg/dropbear/rev/eed9376a4ad6
+  https://hg.ucc.asn.au/dropbear/rev/eed9376a4ad6
 
 - Security: dbclient or dropbear server could expose process memory to the
   running user if compiled with DEBUG_TRACE and running with -v
   CVE-2016-7409
-  https://secure.ucc.asn.au/hg/dropbear/rev/6a14b1f6dc04
+  https://hg.ucc.asn.au/dropbear/rev/6a14b1f6dc04
 
   The security issues were reported by an anonymous researcher working with
   Beyond Security's SecuriTeam Secure Disclosure www.beyondsecurity.com/ssd.html
@@ -195,7 +676,7 @@
 
 - Validate X11 forwarding input. Could allow bypass of authorized_keys command= restrictions,
   found by github.com/tintinweb. Thanks for Damien Miller for a patch. CVE-2016-3116
-  https://secure.ucc.asn.au/hg/dropbear/rev/a3e8389e01ff
+  https://hg.ucc.asn.au/dropbear/rev/a3e8389e01ff
 
 2015.71 - 3 December 2015
 
@@ -476,11 +957,11 @@ kernels, from Steve Dover
 - Limit the size of decompressed payloads, avoids memory exhaustion denial
   of service 
   Thanks to Logan Lamb for reporting and investigating it. CVE-2013-4421
-  https://secure.ucc.asn.au/hg/dropbear/rev/0bf76f54de6f
+  https://hg.ucc.asn.au/dropbear/rev/0bf76f54de6f
 
 - Avoid disclosing existence of valid users through inconsistent delays
   Thanks to Logan Lamb for reporting. CVE-2013-4434
-  https://secure.ucc.asn.au/hg/dropbear/rev/d7784616409a
+  https://hg.ucc.asn.au/dropbear/rev/d7784616409a
 
 - Update config.guess and config.sub for newer architectures
 
@@ -583,7 +1064,7 @@ though probably will be soon
   This bug affects releases 0.52 onwards. Ref CVE-2012-0920.
   Thanks to Danny Fullerton of Mantor Organization for reporting
   the bug.
-  https://secure.ucc.asn.au/hg/dropbear/rev/818108bf7749
+  https://hg.ucc.asn.au/dropbear/rev/818108bf7749
 
 - Compile fix, only apply IPV6 socket options if they are available in headers
   Thanks to Gustavo Zacarias for the patch
@@ -627,7 +1108,7 @@ though probably will be soon
 - New version numbering scheme.
 
 Source repository has now migrated to Mercurial at 
-https://secure.ucc.asn.au/hg/dropbear/graph/default
+https://hg.ucc.asn.au/dropbear/graph/default
 
 0.53.1 - Wednesday 2 March 2011
 

DEVELOPING.md

@@ -0,0 +1,88 @@
+## Developer Notes
+
+#### Building
+
+See [INSTALL.md](INSTALL.md) for build instructions.
+[SMALL.md](SMALL.md) has hints for building smaller binaries, also see comments in [default_options.h](./src/default_options.h).
+
+Debug symbols can be generated by adding `-g` to `CFLAGS` environment variable.
+```
+export CFLAGS="$CFLAGS -g"
+```
+
+#### File dependencies
+The GitHub [test build script](./.github/workflows/build.yml) requires the [default_options.h](./src/default_options.h) be at the top of the repository tree.
+The script uses the file to generate `localoptions.h` with various features enabled/disabled.
+
+Following are generated files in the format `<target>: <generator>(<source>)`
+```
+- configure: autoconf(configure.ac)
+- src/config.h.in: autoheader(configure.ac)
+- src/config.h: configure(src/config.h.in)
+- Makefile: configure(Makefile.in)
+- default_options_guard.h: make(default_options.h)
+```
+Although generated, the first two files are checked in as they change very infrequently.
+
+#### Debug printing
+
+Set `#define DEBUG_TRACE 1` in [localoptions.h](./localoptions.h) to enable a `-v` verbose option for dropbear and dbclient.
+Higher numbers can be used to allow increased debug levels, with `-v` argument repeated.
+
+For development running `dropbear -F -E` is useful to run in the foreground.
+You can set `#define DEBUG_NOFORK 1` to make dropbear a one-shot server, easy to run under a debugger.
+
+#### Random sources
+
+Most cryptography requires a good random entropy source, both to generate secret keys and in the course of a session.
+Dropbear uses the Linux kernel's `getrandom()` syscall to ensure that the system RNG has been initialised before using it.
+On some systems there is insufficient entropy gathered during early boot - generating hostkeys then will block for some amount of time.
+Dropbear has a `-R` option to generate hostkeys upon the first connection as required - that will allow the system more time to gather entropy.
+
+#### Algorithms
+
+Default algorithm lists are specified in [common-algo.c](./src/common-algo.c). They are in priority order, the client's first matching choice is used (see [rfc4253](https://www.rfc-editor.org/rfc/rfc4253.html)). Dropbear client has `-c` and `-m` arguments to choose which are enabled at runtime (doesn't work for server as of June 2020).
+
+Enabling/disabling algorithms is done in [localoptions.h](./localoptions.h), see [default_options.h](./src/default_options.h).
+
+#### Style
+
+In general please conform to the current style of the file you are editing.
+
+Source code is indented with tabs, width set to 4 (though width shouldn't matter much).
+Braces are on the same line as functions/loops/if - try to keep consistency with existing code.
+
+All `if` statements should have braces, no exceptions.
+
+Add a single space between flow control statements and their open parenthesis:
+```
+if (...
+for (...
+switch (...
+etc.
+```
+
+Use `snake_case` for variable and function names.
+
+Avoid using pointer arithmetic, instead the functions in [buffer.h](./src/buffer.h) should be used.
+
+Some Dropbear platforms have old compilers.
+Variable declarations must be at the top of a scope and comments must be `/* */` rather than `//`.
+
+Pointer variables should be initialised to NULL - it can reduce the severity of bugs.
+
+#### Third party code
+
+Libtomcrypt and libtommath are periodically synced from upstream, so avoid making changes to that code which will need to be maintained.
+Improvements can be sent upstream to the libtom project.
+
+#### Non-root user
+
+Dropbear server will run fine as a non-root user, allowing logins only for that user.
+Password authentication probably won't work (can't read shadow passwords). You will need to create hostkeys that are readable.
+
+#### Connection setup
+
+Dropbear implements `first_kex_packet_follows` to reduce handshake latency [RFC 4253 7.1](https://www.rfc-editor.org/rfc/rfc4253.html#section-7.1).
+Some less common implementations don't handle that - it can be a cause of problems connecting.
+Note also that Dropbear may send several ssh packets within a single TCP packet - it's just a stream.

Dockerfile

@@ -0,0 +1,14 @@
+FROM alpine:3.17.1 AS builder
+
+RUN apk add --no-cache alpine-sdk
+RUN apk add --no-cache \
+    musl-dev \
+    zlib-dev \
+    tar \
+    bzip2 \
+    bash
+
+RUN mkdir -p /root/dropbear/
+WORKDIR /root/dropbear/
+
+ENTRYPOINT ["bash"]

FUZZER-NOTES.md

@@ -0,0 +1,55 @@
+## Fuzzing Dropbear
+
+Dropbear is process-per-session so it assumes calling `dropbear_exit()` is fine at any point to clean up.
+This makes fuzzing a bit trickier. A few pieces of wrapping infrastructure are used to work around this.
+
+The [libfuzzer](http://llvm.org/docs/LibFuzzer.html#fuzz-target) harness expects a long running process to continually run a test function with a string of crafted input.
+That process should not leak resources or exit.
+
+#### longjmp
+
+When dropbear runs in fuzz mode it sets up a [`setjmp()`](http://man7.org/linux/man-pages/man3/setjmp.3.html) target prior to launching the code to be fuzzed, and then [`dropbear_exit()`](./src/dbutil.c#L125) calls `longjmp()` back there.
+This avoids exiting though it doesn't free memory or other resources.
+
+#### malloc Wrapper
+
+Dropbear normally uses a [`m_malloc()`](./src/dbmalloc.c) function that is the same as `malloc()` but exits if allocation fails.
+In fuzzing mode this is replaced with a tracking allocator that stores all allocations in a linked list.
+After the `longjmp()` occurs the fuzzer target calls [`m_malloc_free_epoch(1, 1)`](./src/dbmalloc.c#L80) to clean up any unreleased memory.
+
+If the fuzz target runs to completion it calls `m_malloc_free_epoch(1, 0)` which will reset the tracked allocations but will not free memory.
+That allows libfuzzer's leak checking to detect leaks in normal operation.
+
+#### File Descriptor Input
+
+As a network process Dropbear reads and writes from a socket.
+The wrappers for `read()`/`write()`/`select()` in [fuzz-wrapfd.c](./fuzz/fuzz-wrapfd.c) will read from the fuzzer input that has been set up with `wrapfd_add()`. `write()` output is currently discarded.
+These also test error paths such as EINTR and short reads with certain probabilities.
+
+This allows running the entire dropbear server process with network input provided by the fuzzer, without many modifications to the main code.
+At the time of writing this only runs the pre-authentication stages, though post-authentication could be run similarly.
+
+#### Encryption and Randomness
+
+When running in fuzzing mode Dropbear uses a [fixed seed](./src/dbrandom.c#L185) every time so that failures can be reproduced.
+
+Since the fuzzer cannot generate valid encrypted input the packet decryption and message authentication calls are disabled, see [packet.c](./src/packet.c).
+MAC failures are set to occur with a low probability to test that error path.
+
+#### Fuzzers
+
+Current fuzzers are:
+
+* [fuzzer-preauth](./fuzz/fuzzer-preauth.c) - the fuzzer input is treated as a stream of session input.
+  This will test key exchange, packet ordering, authentication attempts etc.
+* [fuzzer-preauth_nomaths](./fuzz/fuzzer-preauth_nomaths.c) - the same as fuzzer-preauth but with asymmetric crypto routines replaced with dummies for faster runtime.
+  corpora are shared between fuzzers by [oss-fuzz](https://github.com/google/oss-fuzz) so this will help fuzzer-preauth too.
+* [fuzzer-verify](./fuzz/fuzzer-verify.c) - read a key and signature from fuzzer input and verify that signature.
+  It would not be expected to pass, though some keys with bad parameters are able to validate with a trivial signature - extra checks are added for that.
+* [fuzzer-pubkey](./fuzz/fuzzer-pubkey.c) - test parsing of an `authorized_keys` line.
+* [fuzzer-kexdh](./fuzz/fuzzer-kexdh.c) - test Diffie-Hellman key exchange where the fuzz input is the ephemeral public key that would be received over the network.
+  This is testing `mp_expt_mod()` and and other libtommath routines.
+* [fuzzer-kexecdh](./fuzz/fuzzer-kexecdh.c) - test Elliptic Curve Diffie-Hellman key exchange like fuzzer-kexdh.
+  This is testing libtommath ECC routines.
+* [fuzzer-kexcurve25519](./fuzz/fuzzer-kexcurve25519.c) - test Curve25519 Elliptic Curve Diffie-Hellman key exchange like fuzzer-kexecdh.
+  This is testing `dropbear_curve25519_scalarmult()` and other libtommath routines.

INSTALL

@@ -1,89 +0,0 @@
-Basic Dropbear build instructions:
-
-- Edit localoptions.h to set which features you want. Available options
-  are described in default_options.h, these will be overridden by
-  anything set in localoptions.h
-
-- If using a Mercurial or Git checkout, "autoconf; autoheader"
-
-- Configure for your system:
-  ./configure     (optionally with --disable-zlib or --disable-syslog,
-                  or --help for other options)
-
-- Compile:
-
-  make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
-
-- Optionally install, or copy the binaries another way
-
-  make install (/usr/local/bin is usual default):
-
-  or
-
-  make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install
-
-(you can leave items out of the PROGRAMS list to avoid compiling them. If you
-recompile after changing the PROGRAMS list, you *MUST* "make clean" before
-recompiling - bad things will happen otherwise)
-
-See MULTI for instructions on making all-in-one binaries.
-
-If you want to compile statically use ./configure --enable-static
-
-By default Dropbear adds various build flags that improve robustness 
-against programming bugs (good for security). If these cause problems
-they can be disabled with ./configure --disable-harden
-
-Binaries can be stripped with "make strip"
-
-============================================================================
-
-If you're compiling for a 386-class CPU, you will probably need to add
-CFLAGS=-DLTC_NO_BSWAP so that libtomcrypt doesn't use 486+ instructions.
-
-============================================================================
-
-Compiling with uClibc:
-
-Firstly, make sure you have at least uclibc 0.9.17, as getusershell() in prior
-versions is broken. Also note that you may get strange issues if your uClibc
-headers don't match the library you are running with, ie the headers might
-say that shadow password support exists, but the libraries don't have it.
-
-Compiling for uClibc should be the same as normal, just set CC to the magic
-uClibc toolchain compiler (ie export CC=i386-uclibc-gcc or whatever).
-You can use "make STATIC=1" to make statically linked binaries, and it is
-advisable to strip the binaries too. If you're looking to make a small binary,
-you should remove unneeded ciphers and MD5, by editing options.h
-
-It is possible to compile zlib in, by copying zlib.h and zconf.h into a
-subdirectory (ie zlibincludes), and 
-
-export CFLAGS="-Izlibincludes -I../zlibincludes"
-export LDFLAGS=/usr/lib/libz.a
-
-before ./configure and make.
-
-If you disable zlib, you must explicitly disable compression for the client -
-OpenSSH is possibly buggy in this regard, it seems you need to disable it
-globally in ~/.ssh/config, not just in the host entry in that file.
-
-You may want to manually disable lastlog recording when using uClibc, configure
-with --disable-lastlog.
-
-One common problem is pty allocation. There are a number of types of pty
-allocation which can be used -- if they work properly, the end result is the
-same for each type. Running configure should detect the best type to use
-automatically, however for some systems, this may be incorrect. Some
-things to note:
-
-    If your system expects /dev/pts to be mounted (this is a uClibc option),
-	make sure that it is.
-
-	Make sure that your libc headers match the library version you are using.
-
-	If openpty() is being used (HAVE_OPENPTY defined in config.h) and it fails,
-	you can try compiling with --disable-openpty. You will probably then need
-	to create all the /dev/pty?? and /dev/tty?? devices, which can be
-	problematic for devfs. In general, openpty() is the best way to allocate
-	PTYs, so it's best to try and get it working.

INSTALL.md

@@ -0,0 +1,97 @@
+## Basic Dropbear Build Instructions
+
+### Build Options
+
+Custom build options can be configured in `localoptions.h` in the build directory. This is a local file, not checked in to git.
+
+Available options are described in [`src/default_options.h`](src/default_options.h)
+Options include available cryptographic algorithms, SSH features, and file paths.
+
+In addition, a `src/distrooptions.h` file will be used if it exists, for distributions to set configuration options.
+
+### Configure for your system
+```
+./configure
+```
+Optionally with `--disable-zlib` or `--disable-syslog`.
+Or `--help` for other options.
+
+You'll need to first run `autoconf; autoheader` if you edit `configure.ac`.
+
+### Compile:
+
+```
+make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp"
+```
+
+Optionally install, or copy the binaries another way:
+
+```
+make install
+```
+`/usr/local/bin` is usual default.
+
+or
+
+```
+make PROGRAMS="dropbear dbclient dropbearkey dropbearconvert scp" install
+```
+
+To test the installation targeting a temporary forder set `DESTDIR`:
+```
+make install DESTDIR=/same/temp/location
+```
+
+You can leave items out of the `PROGRAMS` list to avoid compiling them.
+If you recompile after changing the `PROGRAMS` list, you **MUST** `make clean` before recompiling - bad things will happen otherwise.
+
+[DEVELOPING.md](DEVELOPING.md) has some notes on other developer topics, including debugging.
+
+See [MULTI.md](MULTI.md) for instructions on making all-in-one binaries.
+
+If you want to compile statically use
+```
+./configure --enable-static
+```
+
+By default Dropbear adds various build flags that improve robustness against programming bugs (good for security).
+If these cause problems they can be disabled with `./configure --disable-harden`.
+
+Binaries can be stripped with `make strip`.
+
+> **Note**
+> If you're compiling for a 386-class CPU, you will probably need to add CFLAGS=-DLTC_NO_BSWAP so that libtomcrypt doesn't use 486+ instructions.
+
+## Compiling with uClibc
+
+Firstly, make sure you have at least uclibc 0.9.17, as `getusershell()` in prior versions is broken.
+Also note that you may get strange issues if your uClibc headers don't match the library you are running with.
+I.e. the headers might say that shadow password support exists, but the libraries don't have it.
+
+Compiling for uClibc should be the same as normal, just set CC to the magic uClibc toolchain compiler (ie `export CC=i386-uclibc-gcc` or whatever).
+You can use `make STATIC=1` to make statically linked binaries, and it is advisable to strip the binaries too.
+If you're looking to make a small binary, you should remove unneeded ciphers and algorithms, by editing [localoptions.h](./localoptions.h).
+
+It is possible to compile zlib in, by copying zlib.h and zconf.h into a subdirectory (ie zlibincludes), and
+
+```
+export CFLAGS="-Izlibincludes -I../zlibincludes"
+export LDFLAGS=/usr/lib/libz.a
+```
+before `./configure` and `make`.
+
+If you disable zlib, you must explicitly disable compression for the client.
+OpenSSH is possibly buggy in this regard, it seems you need to disable it globally in `~/.ssh/config`, not just in the host entry in that file.
+
+You may want to manually disable lastlog recording when using uClibc, configure with `--disable-lastlog`.
+
+One common problem is pty allocation.
+There are a number of types of pty allocation which can be used -- if they work properly, the end result is the same for each type.
+Running configure should detect the best type to use automatically, however for some systems, this may be incorrect.
+Some things to note:
+
+* If your system expects `/dev/pts` to be mounted (this is a uClibc option), make sure that it is.
+* Make sure that your libc headers match the library version you are using.
+* If `openpty()` is being used (`HAVE_OPENPTY` defined in `config.h`) and it fails, you can try compiling with `--disable-openpty`. 
+  You will probably then need to create all the `/dev/pty??` and `/dev/tty??` devices, which can be problematic for `devfs`.
+  In general, `openpty()` is the best way to allocate PTYs, so it's best to try and get it working.

LICENSE

@@ -8,7 +8,7 @@ The majority of code is written by Matt Johnston, under the license below.
 Portions of the client-mode work are (c) 2004 Mihnea Stoenescu, under the
 same license:
 
-Copyright (c) 2002-2015 Matt Johnston
+Copyright (c) 2002-2020 Matt Johnston
 Portions copyright (c) 2004 Mihnea Stoenescu
 All rights reserved.
 
@@ -32,7 +32,8 @@ SOFTWARE.
 
 =====
 
-LibTomCrypt and LibTomMath are written by Tom St Denis, and are Public Domain.
+LibTomCrypt and LibTomMath are written by Tom St Denis and others, see
+libtomcrypt/LICENSE and libtommath/LICENSE.
 
 =====
 
@@ -90,52 +91,24 @@ WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
 =====
 
-curve25519-donna:
+curve25519.c:
 
-/* Copyright 2008, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * curve25519-donna: Curve25519 elliptic curve, public key function
- *
- * http://code.google.com/p/curve25519-donna/
- *
- * Adam Langley <agl@imperialviolet.org>
- *
- * Derived from public domain C code by Daniel J. Bernstein <djb@cr.yp.to>
- *
- * More information about curve25519 can be found here
- *   http://cr.yp.to/ecdh.html
- *
- * djb's sample implementation of curve25519 is written in a special assembly
- * language called qhasm and uses the floating point registers.
- *
- * This is, almost, a clean room reimplementation from the curve25519 paper. It
- * uses many of the tricks described therein. Only the crecip function is taken
- * from the sample implementation.
- */
+Modified TweetNaCl version 20140427, a self-contained public-domain C library.
+https://tweetnacl.cr.yp.to/
+
+Contributors (alphabetical order)
+Daniel J. Bernstein, University of Illinois at Chicago and Technische
+Universiteit Eindhoven
+Bernard van Gastel, Radboud Universiteit Nijmegen
+Wesley Janssen, Radboud Universiteit Nijmegen
+Tanja Lange, Technische Universiteit Eindhoven
+Peter Schwabe, Radboud Universiteit Nijmegen
+Sjaak Smetsers, Radboud Universiteit Nijmegen
+
+Acknowledgments
+This work was supported by the U.S. National Science Foundation under grant
+1018836. "Any opinions, findings, and conclusions or recommendations expressed
+in this material are those of the author(s) and do not necessarily reflect the
+views of the National Science Foundation."
+This work was supported by the Netherlands Organisation for Scientific
+Research (NWO) under grant 639.073.005 and Veni 2013 project 13114.

MULTI

@@ -1,22 +0,0 @@
-Multi-binary compilation
-========================
-
-To compile for systems without much space (floppy distributions etc), you
-can create a single binary. This will save disk space by avoiding repeated
-code between the various parts.
-If you are familiar with "busybox", it's the same principle.
-
-To compile the multi-binary, first "make clean" (if you've compiled
-previously), then
-
-make PROGRAMS="programs you want here" MULTI=1
-
-To use the binary, symlink it from the desired executable:
-
-ln -s dropbearmulti dropbear
-ln -s dropbearmulti dbclient
-etc
-
-then execute as normal:
-
-./dropbear <options here>

MULTI.md

@@ -0,0 +1,25 @@
+## Multi-Binary Compilation
+
+To compile for systems without much space (floppy distributions etc), you can create a single binary.
+This will save disk space by avoiding repeated code between the various parts.
+If you are familiar with BusyBox, it's the same principle.
+
+To compile the multi-binary, first `make clean` (if you've compiled previously), then
+
+```sh
+make PROGRAMS="programs you want here" MULTI=1
+```
+
+To use the binary, symlink it from the desired executable:
+
+```sh
+ln -s dropbearmulti dropbear
+ln -s dropbearmulti dbclient
+```
+etc.
+
+Then execute as normal:
+
+```
+./dropbear <options here>
+```

Makefile.in

@@ -12,61 +12,97 @@ ifndef PROGRAMS
 	PROGRAMS=dropbear dbclient dropbearkey dropbearconvert
 endif
 
+srcdir=@srcdir@/src
+VPATH=@srcdir@/src
+
 STATIC_LTC=libtomcrypt/libtomcrypt.a
 STATIC_LTM=libtommath/libtommath.a
 
 LIBTOM_LIBS=@LIBTOM_LIBS@
 
 ifeq (@BUNDLED_LIBTOM@, 1)
-LIBTOM_DEPS=$(STATIC_LTC) $(STATIC_LTM) 
-LIBTOM_CLEAN=ltc-clean ltm-clean
-CFLAGS+=-I$(srcdir)/libtomcrypt/src/headers/
-LIBTOM_LIBS=$(STATIC_LTC) $(STATIC_LTM)
+	LIBTOM_DEPS=$(STATIC_LTC) $(STATIC_LTM)
+	LIBTOM_CLEAN=ltc-clean ltm-clean
+	CPPFLAGS+=-I$(srcdir)/../libtomcrypt/src/headers/
+	LIBTOM_LIBS=$(STATIC_LTC) $(STATIC_LTM)
 endif
 
-OPTION_HEADERS = default_options_guard.h sysoptions.h
-ifneq ($(wildcard localoptions.h),)
-CFLAGS+=-DLOCALOPTIONS_H_EXISTS
-OPTION_HEADERS += localoptions.h
+ifneq ($(wildcard ./localoptions.h),)
+	CPPFLAGS+=-DLOCALOPTIONS_H_EXISTS
+endif
+ifneq ($(wildcard $(srcdir)/distrooptions.h),)
+	CPPFLAGS+=-DDISTROOPTIONS_H_EXISTS
 endif
 
-COMMONOBJS=dbutil.o buffer.o dbhelpers.o \
+OBJ_DIR=./obj
+MAN_DIR=@srcdir@/manpages
+
+_COMMONOBJS=dbutil.o buffer.o dbhelpers.o \
 		dss.o bignum.o \
 		signkey.o rsa.o dbrandom.o \
 		queue.o \
 		atomicio.o compat.o fake-rfc2553.o \
-		ltc_prng.o ecc.o ecdsa.o crypto_desc.o \
-		gensignkey.o gendss.o genrsa.o
+		ltc_prng.o ecc.o ecdsa.o sk-ecdsa.o crypto_desc.o \
+		curve25519.o ed25519.o sk-ed25519.o \
+		dbmalloc.o \
+		gensignkey.o gendss.o genrsa.o gened25519.o
+COMMONOBJS = $(patsubst %,$(OBJ_DIR)/%,$(_COMMONOBJS))
 
-SVROBJS=svr-kex.o svr-auth.o sshpty.o \
+_SVROBJS=svr-kex.o svr-auth.o sshpty.o \
 		svr-authpasswd.o svr-authpubkey.o svr-authpubkeyoptions.o svr-session.o svr-service.o \
 		svr-chansession.o svr-runopts.o svr-agentfwd.o svr-main.o svr-x11fwd.o\
 		svr-tcpfwd.o svr-authpam.o
+SVROBJS = $(patsubst %,$(OBJ_DIR)/%,$(_SVROBJS))
 
-CLIOBJS=cli-main.o cli-auth.o cli-authpasswd.o cli-kex.o \
+_CLIOBJS=cli-main.o cli-auth.o cli-authpasswd.o cli-kex.o \
 		cli-session.o cli-runopts.o cli-chansession.o \
 		cli-authpubkey.o cli-tcpfwd.o cli-channel.o cli-authinteract.o \
-		cli-agentfwd.o 
+		cli-agentfwd.o cli-readconf.o
+CLIOBJS = $(patsubst %,$(OBJ_DIR)/%,$(_CLIOBJS))
 
-CLISVROBJS=common-session.o packet.o common-algo.o common-kex.o \
-			common-channel.o common-chansession.o termcodes.o loginrec.o \
-			tcp-accept.o listener.o process-packet.o dh_groups.o \
-			common-runopts.o circbuffer.o curve25519-donna.o list.o netio.o
+_CLISVROBJS=common-session.o packet.o common-algo.o common-kex.o \
+		common-channel.o common-chansession.o termcodes.o loginrec.o \
+		tcp-accept.o listener.o process-packet.o dh_groups.o \
+		common-runopts.o circbuffer.o list.o netio.o chachapoly.o gcm.o
+CLISVROBJS = $(patsubst %,$(OBJ_DIR)/%,$(_CLISVROBJS))
 
-KEYOBJS=dropbearkey.o
+_KEYOBJS=dropbearkey.o
+KEYOBJS = $(patsubst %,$(OBJ_DIR)/%,$(_KEYOBJS))
 
-CONVERTOBJS=dropbearconvert.o keyimport.o
+_CONVERTOBJS=dropbearconvert.o keyimport.o signkey_ossh.o
+CONVERTOBJS = $(patsubst %,$(OBJ_DIR)/%,$(_CONVERTOBJS))
 
-SCPOBJS=scp.o progressmeter.o atomicio.o scpmisc.o compat.o
+_SCPOBJS=scp.o progressmeter.o atomicio.o scpmisc.o compat.o
+SCPOBJS = $(patsubst %,$(OBJ_DIR)/%,$(_SCPOBJS))
 
-dropbearobjs=$(COMMONOBJS) $(CLISVROBJS) $(SVROBJS)
-dbclientobjs=$(COMMONOBJS) $(CLISVROBJS) $(CLIOBJS)
-dropbearkeyobjs=$(COMMONOBJS) $(KEYOBJS)
-dropbearconvertobjs=$(COMMONOBJS) $(CONVERTOBJS)
-scpobjs=$(SCPOBJS)
+ifeq (@DROPBEAR_FUZZ@, 1)
+	allobjs = $(COMMONOBJS) fuzz/fuzz-common.o  fuzz/fuzz-wrapfd.o $(CLISVROBJS) $(CLIOBJS) $(SVROBJS) @CRYPTLIB@
+	allobjs:=$(subst $(OBJ_DIR)/svr-main.o, ,$(allobjs))
+	allobjs:=$(subst $(OBJ_DIR)/cli-main.o, ,$(allobjs))
 
-VPATH=@srcdir@
-srcdir=@srcdir@
+	dropbearobjs=$(allobjs) $(OBJ_DIR)/svr-main.o
+	dbclientobjs=$(allobjs) $(OBJ_DIR)/cli-main.o
+	dropbearkeyobjs=$(allobjs) $(KEYOBJS)
+	dropbearconvertobjs=$(allobjs) $(CONVERTOBJS)
+	# CXX only set when fuzzing
+	CXX=@CXX@
+	FUZZ_CLEAN=fuzz-clean
+else
+	dropbearobjs=$(COMMONOBJS) $(CLISVROBJS) $(SVROBJS)
+	dbclientobjs=$(COMMONOBJS) $(CLISVROBJS) $(CLIOBJS)
+	dropbearkeyobjs=$(COMMONOBJS) $(KEYOBJS)
+	dropbearconvertobjs=$(COMMONOBJS) $(CONVERTOBJS)
+	scpobjs=$(SCPOBJS)
+endif
+
+ifeq (@DROPBEAR_PLUGIN@, 1)
+	# rdynamic makes all the global symbols of dropbear available to all the loaded shared libraries
+	# this allow a plugin to reuse existing crypto/utilities like base64_decode/base64_encode without
+	# the need to rewrite them.
+	PLUGIN_LIBS=-ldl -rdynamic
+else
+	PLUGIN_LIBS=
+endif
 
 prefix=@prefix@
 exec_prefix=@exec_prefix@
@@ -82,8 +118,8 @@ AR=@AR@
 RANLIB=@RANLIB@
 STRIP=@STRIP@
 INSTALL=@INSTALL@
-CPPFLAGS=@CPPFLAGS@
-CFLAGS+=-I. -I$(srcdir) $(CPPFLAGS) @CFLAGS@
+CPPFLAGS+=@CPPFLAGS@ -I. -I$(srcdir)
+CFLAGS+=@CFLAGS@
 LIBS+=@LIBS@
 LDFLAGS=@LDFLAGS@
 
@@ -94,15 +130,16 @@ STATIC=@STATIC@
 # whether we're building client, server, or both for the common objects.
 # evilness so we detect 'dropbear' by itself as a word
 ifneq (,$(strip $(foreach prog, $(PROGRAMS), $(findstring ZdropbearZ, Z$(prog)Z))))
-	CFLAGS+= -DDROPBEAR_SERVER
+	CPPFLAGS+= -DDROPBEAR_SERVER
 endif
 ifneq (,$(strip $(foreach prog, $(PROGRAMS), $(findstring ZdbclientZ, Z$(prog)Z))))
-	CFLAGS+= -DDROPBEAR_CLIENT
+	CPPFLAGS+= -DDROPBEAR_CLIENT
 endif
 
 # these are exported so that libtomcrypt's makefile will use them
 export CC
 export CFLAGS
+export CPPFLAGS
 export RANLIB AR STRIP
 
 ifeq ($(STATIC), 1)
@@ -117,21 +154,30 @@ endif
 
 # for the scp progress meter. The -D doesn't affect anything else.
 ifeq ($(SCPPROGRESS), 1)
-	CFLAGS+=-DPROGRESS_METER
+	CPPFLAGS+=-DPROGRESS_METER
 endif
 
 all: $(TARGETS)
 
 # for simplicity assume all source depends on all headers
-HEADERS=$(wildcard $(srcdir)/*.h *.h) $(OPTION_HEADERS)
-%.o : %.c $(HEADERS)
-	$(CC) -c $(CFLAGS) $(CPPFLAGS) $< -o $@
+HEADERS=$(wildcard $(srcdir)/*.h *.h) default_options_guard.h
 
-default_options_guard.h: default_options.h
+$(OBJ_DIR):
+	mkdir -p $@
+
+$(OBJ_DIR)/%.o: $(srcdir)/%.c $(HEADERS) | $(OBJ_DIR)
+	$(CC) $(CFLAGS) $(CPPFLAGS) $< -o $@ -c
+
+fuzz/%.o: $(srcdir)/../fuzz/%.c $(HEADERS)
+	$(CC) $(CFLAGS) $(CPPFLAGS) $< -o $@ -c
+
+default_options_guard.h: $(srcdir)/default_options.h
 	@echo Creating $@
 	@printf "/*\n > > > Do not edit this file (default_options_guard.h) < < <\nGenerated from "$^"\nLocal customisation goes in localoptions.h\n*/\n\n" > $@.tmp
 	@$(srcdir)/ifndef_wrapper.sh < $^ >> $@.tmp
-	@mv $@.tmp $@
+	mv -v $@.tmp $@
+	pwd
+	ls -l $@
 
 strip: $(TARGETS)
 	$(STRIP) $(addsuffix $(EXEEXT), $(TARGETS))
@@ -141,31 +187,31 @@ install: $(addprefix inst_, $(TARGETS))
 insmultidropbear: dropbearmulti$(EXEEXT)
 	$(INSTALL) -d $(DESTDIR)$(sbindir)
 	-rm -f $(DESTDIR)$(sbindir)/dropbear$(EXEEXT)
-	-ln -s $(bindir)/dropbearmulti$(EXEEXT) $(DESTDIR)$(sbindir)/dropbear$(EXEEXT) 
+	-ln -s $(bindir)/dropbearmulti$(EXEEXT) $(DESTDIR)$(sbindir)/dropbear$(EXEEXT)
 	$(INSTALL) -d $(DESTDIR)$(mandir)/man8
-	$(INSTALL) -m 644 $(srcdir)/dropbear.8  $(DESTDIR)$(mandir)/man8/dropbear.8
+	$(INSTALL) -m 644 $(MAN_DIR)/dropbear.8  $(DESTDIR)$(mandir)/man8/dropbear.8
 
 insmulti%: dropbearmulti$(EXEEXT)
 	$(INSTALL) -d $(DESTDIR)$(bindir)
-	-rm -f $(DESTDIR)$(bindir)/$*$(EXEEXT) 
-	-ln -s $(bindir)/dropbearmulti$(EXEEXT) $(DESTDIR)$(bindir)/$*$(EXEEXT) 
+	-rm -f $(DESTDIR)$(bindir)/$*$(EXEEXT)
+	-ln -s $(bindir)/dropbearmulti$(EXEEXT) $(DESTDIR)$(bindir)/$*$(EXEEXT)
 	$(INSTALL) -d $(DESTDIR)$(mandir)/man1
-	if test -e $*.1; then $(INSTALL) -m 644 $*.1 $(DESTDIR)$(mandir)/man1/$*.1; fi
+	if test -e $(MAN_DIR)/$*.1; then $(INSTALL) -m 644 $(MAN_DIR)/$*.1 $(DESTDIR)$(mandir)/man1/$*.1; fi
 
 # dropbear should go in sbin, so it needs a separate rule
 inst_dropbear: dropbear
 	$(INSTALL) -d $(DESTDIR)$(sbindir)
 	$(INSTALL) dropbear$(EXEEXT) $(DESTDIR)$(sbindir)
 	$(INSTALL) -d $(DESTDIR)$(mandir)/man8
-	$(INSTALL) -m 644 $(srcdir)/dropbear.8 $(DESTDIR)$(mandir)/man8/dropbear.8
+	$(INSTALL) -m 644 $(MAN_DIR)/dropbear.8 $(DESTDIR)$(mandir)/man8/dropbear.8
 
 inst_%: %
 	$(INSTALL) -d $(DESTDIR)$(bindir)
 	$(INSTALL) $*$(EXEEXT) $(DESTDIR)$(bindir)
 	$(INSTALL) -d $(DESTDIR)$(mandir)/man1
-	if test -e $*.1; then $(INSTALL) -m 644 $*.1 $(DESTDIR)$(mandir)/man1/$*.1; fi
+	if test -e $(MAN_DIR)/$*.1; then $(INSTALL) -m 644 $(MAN_DIR)/$*.1 $(DESTDIR)$(mandir)/man1/$*.1; fi
 
-inst_dropbearmulti: $(addprefix insmulti, $(PROGRAMS)) 
+inst_dropbearmulti: $(addprefix insmulti, $(PROGRAMS))
 
 # for some reason the rule further down doesn't like $($@objs) as a prereq.
 dropbear: $(dropbearobjs)
@@ -174,13 +220,13 @@ dropbearkey: $(dropbearkeyobjs)
 dropbearconvert: $(dropbearconvertobjs)
 
 dropbear: $(HEADERS) $(LIBTOM_DEPS) Makefile
-	$(CC) $(LDFLAGS) -o $@$(EXEEXT) $($@objs) $(LIBTOM_LIBS) $(LIBS) @CRYPTLIB@
+	$(CC) $(LDFLAGS) -o $@$(EXEEXT) $($@objs) $(LIBTOM_LIBS) $(LIBS) @CRYPTLIB@ $(PLUGIN_LIBS)
 
 dbclient: $(HEADERS) $(LIBTOM_DEPS) Makefile
 	$(CC) $(LDFLAGS) -o $@$(EXEEXT) $($@objs) $(LIBTOM_LIBS) $(LIBS)
 
 dropbearkey dropbearconvert: $(HEADERS) $(LIBTOM_DEPS) Makefile
-	$(CC) $(LDFLAGS) -o $@$(EXEEXT) $($@objs) $(LIBTOM_LIBS)
+	$(CC) $(LDFLAGS) -o $@$(EXEEXT) $($@objs) $(LIBTOM_LIBS) $(LIBS)
 
 # scp doesn't use the libs so is special.
 scp: $(SCPOBJS)  $(HEADERS) Makefile
@@ -190,8 +236,8 @@ scp: $(SCPOBJS)  $(HEADERS) Makefile
 # multi-binary compilation.
 MULTIOBJS=
 ifeq ($(MULTI),1)
-	MULTIOBJS=dbmulti.o $(sort $(foreach prog, $(PROGRAMS), $($(prog)objs)))
-	CFLAGS+=$(addprefix -DDBMULTI_, $(PROGRAMS)) -DDROPBEAR_MULTI
+	MULTIOBJS=$(OBJ_DIR)/dbmulti.o $(sort $(foreach prog, $(PROGRAMS), $($(prog)objs)))
+	CPPFLAGS+=$(addprefix -DDBMULTI_, $(PROGRAMS)) -DDROPBEAR_MULTI
 endif
 
 dropbearmulti$(EXEEXT): $(HEADERS) $(MULTIOBJS) $(LIBTOM_DEPS) Makefile
@@ -205,13 +251,13 @@ link%:
 	-rm -f $*$(EXEEXT)
 	-ln -s dropbearmulti$(EXEEXT) $*$(EXEEXT)
 
-$(STATIC_LTC): $(OPTION_HEADERS)
+$(STATIC_LTC): $(HEADERS)
 	$(MAKE) -C libtomcrypt
 
-$(STATIC_LTM): $(OPTION_HEADERS)
+$(STATIC_LTM): $(HEADERS)
 	$(MAKE) -C libtommath
 
-.PHONY : clean sizes thisclean distclean tidy ltc-clean ltm-clean
+.PHONY : clean sizes thisclean distclean tidy ltc-clean ltm-clean lint check
 
 ltc-clean:
 	$(MAKE) -C libtomcrypt clean
@@ -222,17 +268,82 @@ ltm-clean:
 sizes: dropbear
 	objdump -t dropbear|grep ".text"|cut -d "." -f 2|sort -rn
 
-clean: $(LIBTOM_CLEAN) thisclean
+clean: $(LIBTOM_CLEAN) $(FUZZ_CLEAN) thisclean
 
 thisclean:
 	-rm -f dropbear$(EXEEXT) dbclient$(EXEEXT) dropbearkey$(EXEEXT) \
 			dropbearconvert$(EXEEXT) scp$(EXEEXT) scp-progress$(EXEEXT) \
-			dropbearmulti$(EXEEXT) *.o *.da *.bb *.bbg *.prof
+			dropbearmulti$(EXEEXT) *.o *.da *.bb *.bbg *.prof \
+			$(OBJ_DIR)/*
 
 distclean: clean tidy
-	-rm -f config.h
-	-rm -f Makefile
+	-rm -f src/config.h config.status config.log
+	-rm -f Makefile test/Makefile
 	-rm -f default_options_guard.h
 
 tidy:
 	-rm -f *~ *.gcov */*~
+
+lint:
+	cd $(srcdir); ./dropbear_lint.sh
+
+check: lint
+	make -C test
+
+## Fuzzing targets
+
+# list of fuzz targets
+FUZZ_TARGETS=fuzzer-preauth fuzzer-pubkey fuzzer-verify fuzzer-preauth_nomaths \
+	fuzzer-kexdh fuzzer-kexecdh fuzzer-kexcurve25519 fuzzer-client fuzzer-client_nomaths \
+	fuzzer-postauth_nomaths fuzzer-cliconf
+
+FUZZER_OPTIONS = $(addsuffix .options, $(FUZZ_TARGETS))
+FUZZ_OBJS = $(addprefix fuzz/,$(addsuffix .o,$(FUZZ_TARGETS))) \
+	fuzz/fuzz-sshpacketmutator.o
+
+list-fuzz-targets:
+	@echo $(FUZZ_TARGETS)
+
+# fuzzers that don't use libfuzzer, just a standalone harness that feeds inputs
+fuzzstandalone: FUZZLIB=fuzz/fuzz-harness.o
+fuzzstandalone: fuzz/fuzz-harness.o fuzz-targets
+
+# Build all the fuzzers. Usually like
+#   make fuzz-targets FUZZLIB=-lFuzzer.a
+# the library provides main(). Otherwise
+#   make fuzzstandalone
+# provides a main in fuzz-harness.c
+fuzz-targets: $(FUZZ_TARGETS) $(FUZZER_OPTIONS)
+
+$(FUZZ_TARGETS): $(LIBTOM_DEPS) $(allobjs) $(FUZZ_OBJS)
+	$(CXX) $(CXXFLAGS) fuzz/$@.o $(LDFLAGS) $(allobjs) -o $@$(EXEEXT) $(LIBTOM_LIBS) $(LIBS) $(FUZZLIB) @CRYPTLIB@
+
+# fuzzers that use the custom mutator - these expect a SSH network stream
+MUTATOR_FUZZERS=fuzzer-client fuzzer-client_nomaths \
+	fuzzer-preauth fuzzer-preauth_nomaths fuzzer-postauth_nomaths
+
+# Skip custom mutators for -fsanitize-memory since libfuzzer doesn't initialise memory
+# Pending fix for it https://github.com/google/oss-fuzz/issues/4605
+ifeq (,$(findstring fsanitize=memory, $(CFLAGS)))
+$(MUTATOR_FUZZERS): allobjs += fuzz/fuzz-sshpacketmutator.o
+endif
+
+fuzzer-%.options: Makefile
+	echo "[libfuzzer]"               > $@
+	echo "max_len = 50000"          >> $@
+
+# run this to update hardcoded hostkeys for for fuzzing.
+# hostkeys.c is checked in to hg.
+fuzz-hostkeys:
+	dropbearkey -t rsa -f keyr
+	dropbearkey -t dss -f keyd
+	dropbearkey -t ecdsa -size 256 -f keye
+	dropbearkey -t ed25519 -f keyed25519
+	echo > hostkeys.c
+	/usr/bin/xxd -i -a keyr >> hostkeys.c
+	/usr/bin/xxd -i -a keye >> hostkeys.c
+	/usr/bin/xxd -i -a keyd >> hostkeys.c
+	/usr/bin/xxd -i -a keyed25519 >> hostkeys.c
+
+fuzz-clean:
+	-rm -f fuzz/*.o $(FUZZ_TARGETS) $(FUZZER_OPTIONS)

README

@@ -1,78 +0,0 @@
-This is Dropbear, a smallish SSH server and client.
-https://matt.ucc.asn.au/dropbear/dropbear.html
-
-INSTALL has compilation instructions.
-
-MULTI has instructions on making a multi-purpose binary (ie a single binary
-which performs multiple tasks, to save disk space)
-
-SMALL has some tips on creating small binaries.
-
-Please contact me if you have any questions/bugs found/features/ideas/comments etc :)
-There is also a mailing list http://lists.ucc.gu.uwa.edu.au/mailman/listinfo/dropbear
-
-Matt Johnston
-matt@ucc.asn.au
-
-
-In the absence of detailed documentation, some notes follow:
-============================================================================
-
-Server public key auth:
-
-You can use ~/.ssh/authorized_keys in the same way as with OpenSSH, just put
-the key entries in that file. They should be of the form:
-
-ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0Nk/yU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname
-
-You must make sure that ~/.ssh, and the key file, are only writable by the
-user. Beware of editors that split the key into multiple lines.
-
-Dropbear supports some options for authorized_keys entries, see the manpage.
-
-============================================================================
-
-Client public key auth:
-
-Dropbear can do public key auth as a client, but you will have to convert
-OpenSSH style keys to Dropbear format, or use dropbearkey to create them.
-
-If you have an OpenSSH-style private key ~/.ssh/id_rsa, you need to do:
-
-dropbearconvert openssh dropbear ~/.ssh/id_rsa  ~/.ssh/id_rsa.db
-dbclient -i ~/.ssh/id_rsa.db <hostname>
-
-Dropbear does not support encrypted hostkeys though can connect to ssh-agent.
-
-============================================================================
-
-If you want to get the public-key portion of a Dropbear private key, look at
-dropbearkey's '-y' option.
-
-============================================================================
-
-To run the server, you need to server keys, this is one-off:
-./dropbearkey -t rsa -f dropbear_rsa_host_key
-./dropbearkey -t dss -f dropbear_dss_host_key
-./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key
-
-or alternatively convert OpenSSH keys to Dropbear:
-./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key
-
-You can also get Dropbear to create keys when the first connection is made -
-this is preferable to generating keys when the system boots. Make sure 
-/etc/dropbear/ exists and then pass '-R' to the dropbear server.
-
-============================================================================
-
-If the server is run as non-root, you most likely won't be able to allocate a
-pty, and you cannot login as any user other than that running the daemon
-(obviously). Shadow passwords will also be unusable as non-root.
-
-============================================================================
-
-The Dropbear distribution includes a standalone version of OpenSSH's scp
-program. You can compile it with "make scp", you may want to change the path
-of the ssh binary, specified by _PATH_SSH_PROGRAM in options.h . By default
-the progress meter isn't compiled in to save space, you can enable it by 
-adding 'SCPPROGRESS=1' to the make commandline.

README.md

@@ -0,0 +1,84 @@
+## Dropbear SSH
+A smallish SSH server and client
+https://matt.ucc.asn.au/dropbear/dropbear.html
+
+[INSTALL.md](INSTALL.md) has compilation instructions.
+
+[MULTI.md](MULTI.md) has instructions on making a multi-purpose binary (ie a single binary which performs multiple tasks, to save disk space).
+
+[SMALL.md](SMALL.md) has some tips on creating small binaries.
+
+A mirror of the Dropbear website and tarballs is available at https://dropbear.nl/mirror/.
+
+Please contact me if you have any questions/bugs found/features/ideas/comments etc
+There is also a mailing list https://lists.ucc.asn.au/mailman/listinfo/dropbear
+
+Matt Johnston
+matt@ucc.asn.au
+
+
+### In the absence of detailed documentation, some notes follow
+
+----
+#### Server public key auth
+
+You can use `~/.ssh/authorized_keys` in the same way as with OpenSSH, just put the key entries in that file.
+They should be of the form:
+
+    ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAIEAwVa6M6cGVmUcLl2cFzkxEoJd06Ub4bVDsYrWvXhvUV+ZAM9uGuewZBDoAqNKJxoIn0Hyd0NkyU99UVv6NWV/5YSHtnf35LKds56j7cuzoQpFIdjNwdxAN0PCET/MG8qyskG/2IE2DPNIaJ3Wy+Ws4IZEgdJgPlTYUBWWtCWOGc= someone@hostname
+
+You must make sure that `~/.ssh`, and the key file, are only writable by the user.
+Beware of editors that split the key into multiple lines.
+
+Dropbear supports some options for authorized_keys entries, see the manpage.
+
+----
+#### Client public key auth
+
+Dropbear can do public key auth as a client.
+But you will have to convert OpenSSH style keys to Dropbear format, or use dropbearkey to create them.
+
+If you have an OpenSSH-style private key `~/.ssh/id_rsa`, you need to do:
+
+```sh
+dropbearconvert openssh dropbear ~/.ssh/id_rsa  ~/.ssh/id_rsa.db
+dbclient -i ~/.ssh/id_rsa.db <hostname>
+```
+
+Dropbear does not support encrypted hostkeys though can connect to ssh-agent.
+
+----
+If you want to get the public-key portion of a Dropbear private key, look at dropbearkey's `-y` option.
+It will print both public key and fingerprint. If you need the pub key only you can grep by a prefix `ssh-`: 
+```sh
+./dropbearkey -y -f ~/.ssh/id_ed25519 | grep "^ssh-" > ~/.ssh/id_ed25519.pub
+```
+
+----
+To run the server, you need to generate server keys, this is one-off:
+
+```sh
+./dropbearkey -t rsa -f dropbear_rsa_host_key
+./dropbearkey -t dss -f dropbear_dss_host_key
+./dropbearkey -t ecdsa -f dropbear_ecdsa_host_key
+./dropbearkey -t ed25519 -f dropbear_ed25519_host_key
+```
+
+Or alternatively convert OpenSSH keys to Dropbear:
+
+```sh
+./dropbearconvert openssh dropbear /etc/ssh/ssh_host_dsa_key dropbear_dss_host_key
+```
+
+You can also get Dropbear to create keys when the first connection is made - this is preferable to generating keys when the system boots.
+Make sure `/etc/dropbear/` exists and then pass `-R` to the dropbear server.
+
+----
+If the server is run as non-root, you most likely won't be able to allocate a pty, and you cannot login as any user other than that running the daemon (obviously).
+Shadow passwords will also be unusable as non-root.
+
+----
+The Dropbear distribution includes a standalone version of OpenSSH's `scp` program.
+You can compile it with `make scp`.
+You may want to change the path of the ssh binary, specified by `_PATH_SSH_PROGRAM` in `options.h`.
+By default the progress meter isn't compiled in to save space, you can enable it by adding `SCPPROGRESS=1` to the `make` commandline.

SMALL

@@ -1,53 +0,0 @@
-Tips for a small system:
-
-If you only want server functionality (for example), compile with
-	make PROGRAMS=dropbear
-rather than just
-	make dropbear
-so that client functionality in shared portions of Dropbear won't be included.
-The same applies if you are compiling just a client.
-
----
-
-The following are set in options.h:
-
-	- You can safely disable blowfish and twofish ciphers, and MD5 hmac, without
-	  affecting interoperability
-
-	- If you're compiling statically, you can turn off host lookups
-
-	- You can disable either password or public-key authentication, though note
-	  that the IETF draft states that pubkey authentication is required.
-
-	- Similarly with DSS and RSA, you can disable one of these if you know that
-	  all clients will be able to support a particular one. The IETF draft
-	  states that DSS is required, however you may prefer to use RSA. 
-	  DON'T disable either of these on systems where you aren't 100% sure about
-	  who will be connecting and what clients they will be using.
-
-	- Disabling the MOTD code and SFTP-SERVER may save a small amount of codesize
-
-	- You can disable x11, tcp and agent forwarding as desired. None of these are
-	  essential, although agent-forwarding is often useful even on firewall boxes.
-
----
-
-If you are compiling statically, you may want to disable zlib, as it will use
-a few tens of kB of binary-size (./configure --disable-zlib).
-
-You can create a combined binary, see the file MULTI, which will put all
-the functions into one binary, avoiding repeated code.
-
-If you're compiling with gcc, you might want to look at gcc's options for
-stripping unused code. The relevant vars to set before configure are:
-
-LDFLAGS=-Wl,--gc-sections
-CFLAGS="-ffunction-sections -fdata-sections"
-
-You can also experiment with optimisation flags such as -Os, note that in some
-cases these flags actually seem to increase size, so experiment before
-deciding.
-
-Of course using small C libraries such as uClibc and dietlibc can also help.
-
-If you have any queries, mail me and I'll see if I can help.

SMALL.md

@@ -0,0 +1,59 @@
+## Tips for a small system
+
+If you only want server functionality, compile with
+
+```
+make PROGRAMS=dropbear
+```
+
+rather than just
+
+```
+make dropbear
+```
+
+so that client functionality in shared portions of Dropbear won't be included.
+The same applies for `PROGRAMS=dbclient`.
+
+---
+The following are set in `localoptions.h`. See `default_options.h` for possibilities.
+
+You can disable either password or public-key authentication.
+
+Various algorithms can be disabled if they are not required by any connecting SSH clients/servers. 
+Disabling many is fine for a local install, though
+builds for public consumption require more consideration.
+
+You can disable x11, tcp and agent forwarding as desired. None of these are essential (depending on use cases).
+
+---
+If you are compiling statically, you may want to disable zlib, as it will use a few tens of kB of binary size
+```
+./configure --disable-zlib
+```
+
+You can create a combined binary, see the file [MULTI.md](MULTI.md), which will put all the functions into one binary, avoiding repeated code.
+
+If you're compiling with gcc, you might want to look at gcc's options for stripping unused code.
+The relevant vars to set before configure are:
+
+```
+LDFLAGS=-Wl,--gc-sections
+CFLAGS="-ffunction-sections -fdata-sections"
+```
+
+You can also experiment with optimisation flags such as `-Os`. Note that in some cases these flags actually seem to increase size, so experiment before
+deciding.
+
+Of course using small C libraries such as musl can also help.
+
+---
+Libtommath has its own default `CFLAGS` to improve speed. You can use
+
+```
+./configure LTM_CFLAGS=-Os
+```
+
+to reduce size at the expense of speed.
+
+If you have any queries, mail me and I'll see if I can help.

_internal_/Dockerfile.python.nonroot

@@ -0,0 +1,21 @@
+FROM nvidia/cuda:11.1.1-cudnn8-devel-ubuntu18.04
+# use an older system (18.04) to avoid opencv incompatibility (issue#3524)
+
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update && apt-get install -y \
+	python3-opencv ca-certificates python3-dev git wget sudo ninja-build
+RUN ln -sv /usr/bin/python3 /usr/bin/python
+
+# create a non-root user
+ARG USER_ID=1000
+RUN useradd -m --no-log-init --system  --uid ${USER_ID} appuser -g sudo
+RUN echo '%sudo ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers
+USER appuser
+WORKDIR /home/appuser
+
+
+ENV PATH="/home/appuser/.local/bin:${PATH}"
+RUN wget https://bootstrap.pypa.io/pip/3.6/get-pip.py && \
+	python3 get-pip.py --user && \
+	rm get-pip.py
+

build.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+docker build -t dropbearbuild -f Dockerfile .
+
+docker run --rm -t -v $(pwd):/root/dropbear dropbearbuild -c "./configure --disable-utmp --disable-wtmp --disable-lastlog --disable-zlib --disable-syslog --enable-static --disable-harden && make clean && make -j4 MULTI=1 PROGRAMS=\"dropbear dropbearconvert dropbearkey\" && mv dropbearmulti dropbearmulti_ && make clean && mv dropbearmulti_ dropbearmulti"
+
+docker image rm dropbearbuild
+
+mkdir build
+cp dropbearmulti ./build

common-runopts.c

@@ -1,113 +0,0 @@
-/*
- * Dropbear - a SSH2 server
- * 
- * Copyright (c) 2002,2003 Matt Johnston
- * All rights reserved.
- * 
- * Permission is hereby granted, free of charge, to any person obtaining a copy
- * of this software and associated documentation files (the "Software"), to deal
- * in the Software without restriction, including without limitation the rights
- * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- * copies of the Software, and to permit persons to whom the Software is
- * furnished to do so, subject to the following conditions:
- * 
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- * 
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- * SOFTWARE. */
-
-#include "includes.h"
-#include "runopts.h"
-#include "signkey.h"
-#include "buffer.h"
-#include "dbutil.h"
-#include "auth.h"
-#include "algo.h"
-#include "dbrandom.h"
-
-runopts opts; /* GLOBAL */
-
-/* returns success or failure, and the keytype in *type. If we want
- * to restrict the type, type can contain a type to return */
-int readhostkey(const char * filename, sign_key * hostkey, 
-	enum signkey_type *type) {
-
-	int ret = DROPBEAR_FAILURE;
-	buffer *buf;
-
-	buf = buf_new(MAX_PRIVKEY_SIZE);
-
-	if (buf_readfile(buf, filename) == DROPBEAR_FAILURE) {
-		goto out;
-	}
-	buf_setpos(buf, 0);
-
-	addrandom(buf_getptr(buf, buf->len), buf->len);
-
-	if (buf_get_priv_key(buf, hostkey, type) == DROPBEAR_FAILURE) {
-		goto out;
-	}
-
-	ret = DROPBEAR_SUCCESS;
-out:
-
-	buf_burn(buf);
-	buf_free(buf);
-	return ret;
-}
-
-#if DROPBEAR_USER_ALGO_LIST
-void
-parse_ciphers_macs()
-{
-	if (opts.cipher_list)
-	{
-		if (strcmp(opts.cipher_list, "help") == 0)
-		{
-			char *ciphers = algolist_string(sshciphers);
-			dropbear_log(LOG_INFO, "Available ciphers:\n%s\n", ciphers);
-			m_free(ciphers);
-			dropbear_exit(".");
-		}
-
-		if (strcmp(opts.cipher_list, "none") == 0)
-		{
-			/* Encryption is required during authentication */
-			opts.cipher_list = "none,aes128-ctr";
-		}
-
-		if (check_user_algos(opts.cipher_list, sshciphers, "cipher") == 0)
-		{
-			dropbear_exit("No valid ciphers specified for '-c'");
-		}
-	}
-
-	if (opts.mac_list)
-	{
-		if (strcmp(opts.mac_list, "help") == 0)
-		{
-			char *macs = algolist_string(sshhashes);
-			dropbear_log(LOG_INFO, "Available MACs:\n%s\n", macs);
-			m_free(macs);
-			dropbear_exit(".");
-		}
-
-		if (check_user_algos(opts.mac_list, sshhashes, "MAC") == 0)
-		{
-			dropbear_exit("No valid MACs specified for '-m'");
-		}
-	}
-}
-#endif
-
-void print_version() {
-	fprintf(stderr, "Dropbear v%s\n", DROPBEAR_VERSION);
-}
-
-

configure.ac

@@ -5,41 +5,64 @@
 # of the platform checks have been taken straight from OpenSSH's configure.ac
 # Huge thanks to them for dealing with the horrible platform-specifics :)
 
-AC_PREREQ(2.59)
+AC_PREREQ([2.59])
 AC_INIT
-AC_CONFIG_SRCDIR(buffer.c)
 
+# Record which revision is being built
+if test -s "`which hg`" && test -d "$srcdir/.hg"; then
+	hgrev=`hg id -i -R "$srcdir"`
+	AC_MSG_NOTICE([Source directory Mercurial base revision $hgrev])
+fi
+
+ORIGCFLAGS="$CFLAGS"
+LATE_CFLAGS=""
 # Checks for programs.
 AC_PROG_CC
 
 if test -z "$LD" ; then
 	LD=$CC
 fi
-AC_SUBST(LD)	
+AC_SUBST(LD)
 
-AC_DEFUN(DB_TRYADDCFLAGS, 
+AC_DEFUN(DB_TRYADDCFLAGS,
 [{
 		OLDFLAGS="$CFLAGS"
 		TESTFLAGS="$1"
-		CFLAGS="$CFLAGS $TESTFLAGS"
-		AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+		CFLAGS="$TESTFLAGS $CFLAGS"
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
 			[AC_MSG_NOTICE([Not setting $TESTFLAGS]); CFLAGS="$OLDFLAGS" ]
 			)
 }])
 
 # set compile flags prior to other tests
-if test -z "$OLDCFLAGS" && test "$GCC" = "yes"; then
+if test -z "$ORIGCFLAGS" && test "$GCC" = "yes"; then
 	AC_MSG_NOTICE(No \$CFLAGS set... using "-Os -W -Wall" for GCC)
 	CFLAGS="-Os -W -Wall"
 fi
 
+# LTM_CFLAGS is given to ./configure by the user, 
+# DROPBEAR_LTM_CFLAGS is substituted in the LTM Makefile.in
+DROPBEAR_LTM_CFLAGS="$LTM_CFLAGS"
+if test -z "$DROPBEAR_LTM_CFLAGS"; then
+	DROPBEAR_LTM_CFLAGS="-O3 -funroll-loops -fomit-frame-pointer"
+fi
+AC_MSG_NOTICE(Setting LTM_CFLAGS to $DROPBEAR_LTM_CFLAGS)
+AC_ARG_VAR(LTM_CFLAGS, CFLAGS for bundled libtommath. Default -O3 -funroll-loops -fomit-frame-pointer)
+AC_SUBST(DROPBEAR_LTM_CFLAGS)
+
 AC_MSG_NOTICE([Checking if compiler '$CC' supports -Wno-pointer-sign])
 DB_TRYADDCFLAGS([-Wno-pointer-sign])
 
 AC_MSG_NOTICE([Checking if compiler '$CC' supports -fno-strict-overflow])
 DB_TRYADDCFLAGS([-fno-strict-overflow])
 
+AC_MSG_NOTICE([Checking if compiler '$CC' supports -Wundef])
+DB_TRYADDCFLAGS([-Wundef])
+
+# needed for various extensions. define early before autoconf tests
+AC_DEFINE([_GNU_SOURCE], [], [Use GNU extensions if glibc])
+
 STATIC=0
 AC_ARG_ENABLE(static,
 	[  --enable-static         Build static binaries],
@@ -70,15 +93,15 @@ if test "$hardenbuild" -eq 1; then
 
 		OLDLDFLAGS="$LDFLAGS"
 		TESTFLAGS="-Wl,-pie"
-		LDFLAGS="$LDFLAGS $TESTFLAGS"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([])], 
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+		LDFLAGS="$TESTFLAGS $LDFLAGS"
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
 			[
 				LDFLAGS="$OLDLDFLAGS"
 				TESTFLAGS="-pie"
-				LDFLAGS="$LDFLAGS $TESTFLAGS"
-				AC_LINK_IFELSE([AC_LANG_PROGRAM([])], 
-					[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+				LDFLAGS="$TESTFLAGS $LDFLAGS"
+				AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+					[AC_MSG_NOTICE([Setting $TESTFLAGS])],
 					[AC_MSG_NOTICE([Not setting $TESTFLAGS]); LDFLAGS="$OLDLDFLAGS" ]
 					)
 			]
@@ -86,24 +109,24 @@ if test "$hardenbuild" -eq 1; then
 		# readonly elf relocation sections (relro)
 		OLDLDFLAGS="$LDFLAGS"
 		TESTFLAGS="-Wl,-z,now -Wl,-z,relro"
-		LDFLAGS="$LDFLAGS $TESTFLAGS"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([])], 
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+		LDFLAGS="$TESTFLAGS $LDFLAGS"
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
 			[AC_MSG_NOTICE([Not setting $TESTFLAGS]); LDFLAGS="$OLDLDFLAGS" ]
 			)
 	fi # non-static
 	# stack protector. -strong is good but only in gcc 4.9 or later
 	OLDCFLAGS="$CFLAGS"
 	TESTFLAGS="-fstack-protector-strong"
-	CFLAGS="$CFLAGS $TESTFLAGS"
-	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
-	    [AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+	CFLAGS="$TESTFLAGS $CFLAGS"
+	AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+	    [AC_MSG_NOTICE([Setting $TESTFLAGS])],
 	    [
 			CFLAGS="$OLDCFLAGS"
 			TESTFLAGS="-fstack-protector --param=ssp-buffer-size=4"
-			CFLAGS="$CFLAGS $TESTFLAGS"
-			AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
-			    [AC_MSG_NOTICE([Setting $TESTFLAGS])], 
+			CFLAGS="$TESTFLAGS $CFLAGS"
+			AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
+			    [AC_MSG_NOTICE([Setting $TESTFLAGS])],
 			    [AC_MSG_NOTICE([Not setting $TESTFLAGS]); CFLAGS="$OLDCFLAGS" ]
 			    )
 	    ]
@@ -117,6 +140,17 @@ if test "$hardenbuild" -eq 1; then
 
 fi
 
+AC_ARG_ENABLE(werror,
+	[  --enable-werror         Set -Werror when building],
+	[
+		if test "x$enableval" = "xyes"; then
+			# -Werror shouldn't be set when configure runs tests.
+			# We add it to the Makefile's CFLAGS
+			LATE_CFLAGS+="$LATE_CFLAGS -Werror"
+			AC_MSG_NOTICE(Enabling -Werror)
+		fi
+	], [])
+
 # large file support is useful for scp
 AC_SYS_LARGEFILE
 
@@ -152,7 +186,7 @@ case "$host" in
 	# OpenSSH thinks it's broken. If it isn't, let me know.
 	AC_DEFINE(BROKEN_GETADDRINFO,1,Broken getaddrinfo)
 	;;
-	
+
 *-*-hpux*)
 	LIBS="$LIBS -lsec"
 	# It's probably broken.
@@ -166,10 +200,10 @@ esac
 AC_CHECK_TOOL(AR, ar, :)
 AC_CHECK_TOOL(RANLIB, ranlib, :)
 AC_CHECK_TOOL(STRIP, strip, :)
-AC_CHECK_TOOL(INSTALL, install, :)
+AC_PROG_INSTALL
 
 dnl Can't use login() or logout() with uclibc
-AC_CHECK_DECL(__UCLIBC__, 
+AC_CHECK_DECL(__UCLIBC__,
 	[
 	no_loginfunc_check=1
 	AC_MSG_NOTICE([Using uClibc - login() and logout() probably don't work, so we won't use them.])
@@ -177,14 +211,14 @@ AC_CHECK_DECL(__UCLIBC__,
 
 dnl We test for crypt() specially. On Linux (and others?) it resides in libcrypt
 dnl but we don't want link all binaries to -lcrypt, just dropbear server.
-dnl OS X doesn't need -lcrypt 
+dnl OS X doesn't need -lcrypt
 AC_CHECK_FUNC(crypt, found_crypt_func=here)
-AC_CHECK_LIB(crypt, crypt, 
+AC_CHECK_LIB(crypt, crypt,
 	[
 	CRYPTLIB="-lcrypt"
 	found_crypt_func=here
 	])
-AC_SUBST(CRYPTLIB)	
+AC_SUBST(CRYPTLIB)
 if test "t$found_crypt_func" = there; then
 AC_DEFINE(HAVE_CRYPT, 1, [crypt() function])
 fi
@@ -315,16 +349,56 @@ AC_ARG_ENABLE(shadow,
 		AC_MSG_NOTICE(Using shadow passwords if available)
 	]
 )
-			
+
+AC_ARG_ENABLE(plugin,
+	[  --enable-plugin         Enable support for External Public Key Authentication plug-in],
+	[
+		AC_DEFINE(DROPBEAR_PLUGIN, 1, External Public Key Authentication)
+		AC_MSG_NOTICE(Enabling support for External Public Key Authentication)
+		DROPBEAR_PLUGIN=1
+	],
+	[
+		AC_DEFINE(DROPBEAR_PLUGIN, 0, External Public Key Authentication)
+		DROPBEAR_PLUGIN=0
+	]
+
+)
+AC_SUBST(DROPBEAR_PLUGIN)
+
+AC_ARG_ENABLE(fuzz,
+	[  --enable-fuzz           Build fuzzing. Not recommended for deployment.],
+	[
+		if test "x$enableval" = "xyes"; then
+            AC_DEFINE(DROPBEAR_FUZZ, 1, Fuzzing)
+            AC_MSG_NOTICE(Enabling fuzzing)
+            DROPBEAR_FUZZ=1
+            # libfuzzer needs linking with c++ libraries
+            AC_PROG_CXX
+			mkdir -pv fuzz
+        else
+            AC_DEFINE(DROPBEAR_FUZZ, 0, Fuzzing)
+            AC_MSG_NOTICE(Disabling fuzzing)
+            DROPBEAR_FUZZ=0
+        fi
+	],
+	[
+		AC_DEFINE(DROPBEAR_FUZZ, 0, Fuzzing)
+		AC_MSG_NOTICE(Disabling fuzzing)
+		DROPBEAR_FUZZ=0
+	]
+
+)
+AC_SUBST(DROPBEAR_FUZZ)
+AC_SUBST(CXX)
 
 # Checks for header files.
-AC_HEADER_STDC
 AC_HEADER_SYS_WAIT
 AC_CHECK_HEADERS([netinet/in.h netinet/tcp.h \
 	crypt.h \
 	pty.h libutil.h libgen.h inttypes.h stropts.h utmp.h \
 	utmpx.h lastlog.h paths.h util.h netdb.h security/pam_appl.h \
-	pam/pam_appl.h netinet/in_systm.h sys/uio.h linux/pkt_sched.h])
+	pam/pam_appl.h netinet/in_systm.h sys/uio.h linux/pkt_sched.h \
+	sys/random.h sys/prctl.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
@@ -332,7 +406,6 @@ AC_TYPE_UID_T
 AC_TYPE_MODE_T
 AC_TYPE_PID_T
 AC_TYPE_SIZE_T
-AC_HEADER_TIME
 
 AC_CHECK_TYPES([uint8_t, u_int8_t, uint16_t, u_int16_t, uint32_t, u_int32_t])
 AC_CHECK_TYPES([struct sockaddr_storage])
@@ -473,37 +546,41 @@ AC_CHECK_FUNCS(endutxent getutxent getutxid getutxline pututxline )
 AC_CHECK_FUNCS(setutxent utmpxname)
 AC_CHECK_FUNCS(logout updwtmp logwtmp)
 
+# POSIX monotonic time
+AC_CHECK_FUNCS(clock_gettime)
+
 # OS X monotonic time
 AC_CHECK_HEADERS([mach/mach_time.h])
 AC_CHECK_FUNCS(mach_absolute_time)
 
-AC_CHECK_FUNCS(explicit_bzero memset_s)
+AC_CHECK_FUNCS(explicit_bzero memset_s getrandom)
 
 AC_ARG_ENABLE(bundled-libtom,
 [  --enable-bundled-libtom       Force using bundled libtomcrypt/libtommath even if a system version exists.
   --disable-bundled-libtom      Force using system libtomcrypt/libtommath, fail if it does not exist.
-                                Default is to use system if available, otherwise bundled.],
+                                Default is to use system if available, otherwise bundled.
+                                Dropbear requires system libtommath >= 1.2.0 and libtomcrypt >= 1.18.0],
 	[
 		if test "x$enableval" = "xyes"; then
 			BUNDLED_LIBTOM=1
 			AC_MSG_NOTICE(Forcing bundled libtom*)
 		else
 			BUNDLED_LIBTOM=0
-			AC_CHECK_LIB(tommath, mp_exptmod, LIBTOM_LIBS="-ltommath $LIBTOM_LIBS",
-				[AC_MSG_ERROR([Missing system libtommath and --disable-bundled-libtom was specified])] )
-			AC_CHECK_LIB(tomcrypt, register_cipher, LIBTOM_LIBS="-ltomcrypt $LIBTOM_LIBS",
-				[AC_MSG_ERROR([Missing system libtomcrypt and --disable-bundled-libtom was specified])] )
+			AC_CHECK_LIB(tommath, mp_to_ubin, LIBTOM_LIBS="-ltommath $LIBTOM_LIBS",
+				[AC_MSG_ERROR([Missing/old system libtommath and --disable-bundled-libtom was specified])] )
+			AC_CHECK_LIB(tomcrypt, poly1305_init, LIBTOM_LIBS="-ltomcrypt $LIBTOM_LIBS",
+				[AC_MSG_ERROR([Missing/old system libtomcrypt and --disable-bundled-libtom was specified])] )
 		fi
 	],
 	[
 		BUNDLED_LIBTOM=0
-		AC_CHECK_LIB(tommath, mp_exptmod, LIBTOM_LIBS="-ltommath $LIBTOM_LIBS", BUNDLED_LIBTOM=1)
-		AC_CHECK_LIB(tomcrypt, register_cipher, LIBTOM_LIBS="-ltomcrypt $LIBTOM_LIBS", BUNDLED_LIBTOM=1)
+		AC_CHECK_LIB(tommath, mp_to_ubin, LIBTOM_LIBS="-ltommath $LIBTOM_LIBS", BUNDLED_LIBTOM=1)
+		AC_CHECK_LIB(tomcrypt, poly1305_init, LIBTOM_LIBS="-ltomcrypt $LIBTOM_LIBS", BUNDLED_LIBTOM=1)
 	]
 )
 
 if test $BUNDLED_LIBTOM = 1 ; then
-	AC_DEFINE(BUNDLED_LIBTOM,1,Use bundled libtom) 
+	AC_DEFINE(BUNDLED_LIBTOM,1,Use bundled libtom)
 fi
 
 AC_SUBST(LIBTOM_LIBS)
@@ -576,7 +653,7 @@ AC_ARG_ENABLE(pututxline,
 AC_ARG_WITH(lastlog,
   [  --with-lastlog=FILE|DIR specify lastlog location [common locations]],
 	[
-		if test "x$withval" = "xno" ; then	
+		if test "x$withval" = "xno" ; then
 			AC_DEFINE(DISABLE_LASTLOG)
 		else
 			conf_lastlog_location=$withval
@@ -651,7 +728,7 @@ fi
 
 if test -n "$conf_lastlog_location"; then
 	AC_DEFINE_UNQUOTED(CONF_LASTLOG_FILE, "$conf_lastlog_location", lastlog file location)
-fi	
+fi
 
 dnl utmp detection
 AC_MSG_CHECKING([if your system defines UTMP_FILE])
@@ -681,7 +758,7 @@ if test -z "$conf_utmp_location"; then
 fi
 if test -n "$conf_utmp_location"; then
 	AC_DEFINE_UNQUOTED(CONF_UTMP_FILE, "$conf_utmp_location", utmp file location)
-fi	
+fi
 
 dnl wtmp detection
 AC_MSG_CHECKING([if your system defines WTMP_FILE])
@@ -713,7 +790,7 @@ if test -z "$conf_wtmp_location"; then
 fi
 if test -n "$conf_wtmp_location"; then
 	AC_DEFINE_UNQUOTED(CONF_WTMP_FILE, "$conf_wtmp_location", wtmp file location)
-fi	
+fi
 
 
 dnl utmpx detection - I don't know any system so perverse as to require
@@ -741,7 +818,7 @@ if test -z "$conf_utmpx_location"; then
 	fi
 else
 	AC_DEFINE_UNQUOTED(CONF_UTMPX_FILE, "$conf_utmpx_location", utmpx file location)
-fi	
+fi
 
 dnl wtmpx detection
 AC_MSG_CHECKING([if your system defines WTMPX_FILE])
@@ -768,7 +845,7 @@ if test -z "$conf_wtmpx_location"; then
 	fi
 else
 	AC_DEFINE_UNQUOTED(CONF_WTMPX_FILE, "$conf_wtmpx_location", wtmpx file location)
-fi	
+fi
 
 # Checks for library functions.
 AC_PROG_GCC_TRADITIONAL
@@ -776,7 +853,7 @@ AC_FUNC_MEMCMP
 AC_FUNC_SELECT_ARGTYPES
 AC_CHECK_FUNCS([getpass getspnam getusershell putenv])
 AC_CHECK_FUNCS([clearenv strlcpy strlcat daemon basename _getpty getaddrinfo ])
-AC_CHECK_FUNCS([freeaddrinfo getnameinfo fork writev getgrouplist])
+AC_CHECK_FUNCS([freeaddrinfo getnameinfo fork writev getgrouplist fexecve])
 
 AC_SEARCH_LIBS(basename, gen, AC_DEFINE(HAVE_BASENAME))
 
@@ -804,12 +881,17 @@ fi
 AC_EXEEXT
 
 if test $BUNDLED_LIBTOM = 1 ; then
-(cd $srcdir; find libtomcrypt -type d) | xargs mkdir -pv 
+(cd $srcdir; find libtomcrypt -type d) | xargs mkdir -pv
 LIBTOM_FILES="libtomcrypt/Makefile libtommath/Makefile"
 fi
 
-AC_CONFIG_HEADER(config.h)
-AC_CONFIG_FILES(Makefile $LIBTOM_FILES)
+# flags that should be set in Makefile but not for configure tests
+CFLAGS="$CFLAGS $LATE_CFLAGS"
+
+AC_CONFIG_AUX_DIR([src])
+
+AC_CONFIG_HEADERS([config.h:src/config.h.in])
+AC_CONFIG_FILES(Makefile $LIBTOM_FILES test/Makefile)
 AC_OUTPUT
 
 AC_MSG_NOTICE()
@@ -831,4 +913,4 @@ AC_MSG_NOTICE([crypt() not available, dropbear server will not have password aut
 fi
 
 AC_MSG_NOTICE()
-AC_MSG_NOTICE([Now edit options.h to choose features.])
+AC_MSG_NOTICE([Now edit localoptions.h to choose features.])

curve25519-donna.c

@@ -1,860 +0,0 @@
-/* Copyright 2008, Google Inc.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *     * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *     * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *     * Neither the name of Google Inc. nor the names of its
- * contributors may be used to endorse or promote products derived from
- * this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * curve25519-donna: Curve25519 elliptic curve, public key function
- *
- * http://code.google.com/p/curve25519-donna/
- *
- * Adam Langley <agl@imperialviolet.org>
- *
- * Derived from public domain C code by Daniel J. Bernstein <djb@cr.yp.to>
- *
- * More information about curve25519 can be found here
- *   http://cr.yp.to/ecdh.html
- *
- * djb's sample implementation of curve25519 is written in a special assembly
- * language called qhasm and uses the floating point registers.
- *
- * This is, almost, a clean room reimplementation from the curve25519 paper. It
- * uses many of the tricks described therein. Only the crecip function is taken
- * from the sample implementation. */
-
-#include <string.h>
-#include <stdint.h>
-
-#ifdef _MSC_VER
-#define inline __inline
-#endif
-
-typedef uint8_t u8;
-typedef int32_t s32;
-typedef int64_t limb;
-
-/* Field element representation:
- *
- * Field elements are written as an array of signed, 64-bit limbs, least
- * significant first. The value of the field element is:
- *   x[0] + 2^26·x[1] + x^51·x[2] + 2^102·x[3] + ...
- *
- * i.e. the limbs are 26, 25, 26, 25, ... bits wide. */
-
-/* Sum two numbers: output += in */
-static void fsum(limb *output, const limb *in) {
-  unsigned i;
-  for (i = 0; i < 10; i += 2) {
-    output[0+i] = output[0+i] + in[0+i];
-    output[1+i] = output[1+i] + in[1+i];
-  }
-}
-
-/* Find the difference of two numbers: output = in - output
- * (note the order of the arguments!). */
-static void fdifference(limb *output, const limb *in) {
-  unsigned i;
-  for (i = 0; i < 10; ++i) {
-    output[i] = in[i] - output[i];
-  }
-}
-
-/* Multiply a number by a scalar: output = in * scalar */
-static void fscalar_product(limb *output, const limb *in, const limb scalar) {
-  unsigned i;
-  for (i = 0; i < 10; ++i) {
-    output[i] = in[i] * scalar;
-  }
-}
-
-/* Multiply two numbers: output = in2 * in
- *
- * output must be distinct to both inputs. The inputs are reduced coefficient
- * form, the output is not.
- *
- * output[x] <= 14 * the largest product of the input limbs. */
-static void fproduct(limb *output, const limb *in2, const limb *in) {
-  output[0] =       ((limb) ((s32) in2[0])) * ((s32) in[0]);
-  output[1] =       ((limb) ((s32) in2[0])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[0]);
-  output[2] =  2 *  ((limb) ((s32) in2[1])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[0]);
-  output[3] =       ((limb) ((s32) in2[1])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[0]);
-  output[4] =       ((limb) ((s32) in2[2])) * ((s32) in[2]) +
-               2 * (((limb) ((s32) in2[1])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[1])) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[0]);
-  output[5] =       ((limb) ((s32) in2[2])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[0]);
-  output[6] =  2 * (((limb) ((s32) in2[3])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[1])) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[0]);
-  output[7] =       ((limb) ((s32) in2[3])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[0]);
-  output[8] =       ((limb) ((s32) in2[4])) * ((s32) in[4]) +
-               2 * (((limb) ((s32) in2[3])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[1])) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[0]);
-  output[9] =       ((limb) ((s32) in2[4])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[2]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[1]) +
-                    ((limb) ((s32) in2[0])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[0]);
-  output[10] = 2 * (((limb) ((s32) in2[5])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[1])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[1])) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[2]);
-  output[11] =      ((limb) ((s32) in2[5])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[4]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[3]) +
-                    ((limb) ((s32) in2[2])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[2]);
-  output[12] =      ((limb) ((s32) in2[6])) * ((s32) in[6]) +
-               2 * (((limb) ((s32) in2[5])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[3])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[3])) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[4]);
-  output[13] =      ((limb) ((s32) in2[6])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[7])) * ((s32) in[6]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[5]) +
-                    ((limb) ((s32) in2[4])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[4]);
-  output[14] = 2 * (((limb) ((s32) in2[7])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[5])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[5])) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[6]);
-  output[15] =      ((limb) ((s32) in2[7])) * ((s32) in[8]) +
-                    ((limb) ((s32) in2[8])) * ((s32) in[7]) +
-                    ((limb) ((s32) in2[6])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[6]);
-  output[16] =      ((limb) ((s32) in2[8])) * ((s32) in[8]) +
-               2 * (((limb) ((s32) in2[7])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[7]));
-  output[17] =      ((limb) ((s32) in2[8])) * ((s32) in[9]) +
-                    ((limb) ((s32) in2[9])) * ((s32) in[8]);
-  output[18] = 2 *  ((limb) ((s32) in2[9])) * ((s32) in[9]);
-}
-
-/* Reduce a long form to a short form by taking the input mod 2^255 - 19.
- *
- * On entry: |output[i]| < 14*2^54
- * On exit: |output[0..8]| < 280*2^54 */
-static void freduce_degree(limb *output) {
-  /* Each of these shifts and adds ends up multiplying the value by 19.
-   *
-   * For output[0..8], the absolute entry value is < 14*2^54 and we add, at
-   * most, 19*14*2^54 thus, on exit, |output[0..8]| < 280*2^54. */
-  output[8] += output[18] << 4;
-  output[8] += output[18] << 1;
-  output[8] += output[18];
-  output[7] += output[17] << 4;
-  output[7] += output[17] << 1;
-  output[7] += output[17];
-  output[6] += output[16] << 4;
-  output[6] += output[16] << 1;
-  output[6] += output[16];
-  output[5] += output[15] << 4;
-  output[5] += output[15] << 1;
-  output[5] += output[15];
-  output[4] += output[14] << 4;
-  output[4] += output[14] << 1;
-  output[4] += output[14];
-  output[3] += output[13] << 4;
-  output[3] += output[13] << 1;
-  output[3] += output[13];
-  output[2] += output[12] << 4;
-  output[2] += output[12] << 1;
-  output[2] += output[12];
-  output[1] += output[11] << 4;
-  output[1] += output[11] << 1;
-  output[1] += output[11];
-  output[0] += output[10] << 4;
-  output[0] += output[10] << 1;
-  output[0] += output[10];
-}
-
-#if (-1 & 3) != 3
-#error "This code only works on a two's complement system"
-#endif
-
-/* return v / 2^26, using only shifts and adds.
- *
- * On entry: v can take any value. */
-static inline limb
-div_by_2_26(const limb v)
-{
-  /* High word of v; no shift needed. */
-  const uint32_t highword = (uint32_t) (((uint64_t) v) >> 32);
-  /* Set to all 1s if v was negative; else set to 0s. */
-  const int32_t sign = ((int32_t) highword) >> 31;
-  /* Set to 0x3ffffff if v was negative; else set to 0. */
-  const int32_t roundoff = ((uint32_t) sign) >> 6;
-  /* Should return v / (1<<26) */
-  return (v + roundoff) >> 26;
-}
-
-/* return v / (2^25), using only shifts and adds.
- *
- * On entry: v can take any value. */
-static inline limb
-div_by_2_25(const limb v)
-{
-  /* High word of v; no shift needed*/
-  const uint32_t highword = (uint32_t) (((uint64_t) v) >> 32);
-  /* Set to all 1s if v was negative; else set to 0s. */
-  const int32_t sign = ((int32_t) highword) >> 31;
-  /* Set to 0x1ffffff if v was negative; else set to 0. */
-  const int32_t roundoff = ((uint32_t) sign) >> 7;
-  /* Should return v / (1<<25) */
-  return (v + roundoff) >> 25;
-}
-
-/* Reduce all coefficients of the short form input so that |x| < 2^26.
- *
- * On entry: |output[i]| < 280*2^54 */
-static void freduce_coefficients(limb *output) {
-  unsigned i;
-
-  output[10] = 0;
-
-  for (i = 0; i < 10; i += 2) {
-    limb over = div_by_2_26(output[i]);
-    /* The entry condition (that |output[i]| < 280*2^54) means that over is, at
-     * most, 280*2^28 in the first iteration of this loop. This is added to the
-     * next limb and we can approximate the resulting bound of that limb by
-     * 281*2^54. */
-    output[i] -= over << 26;
-    output[i+1] += over;
-
-    /* For the first iteration, |output[i+1]| < 281*2^54, thus |over| <
-     * 281*2^29. When this is added to the next limb, the resulting bound can
-     * be approximated as 281*2^54.
-     *
-     * For subsequent iterations of the loop, 281*2^54 remains a conservative
-     * bound and no overflow occurs. */
-    over = div_by_2_25(output[i+1]);
-    output[i+1] -= over << 25;
-    output[i+2] += over;
-  }
-  /* Now |output[10]| < 281*2^29 and all other coefficients are reduced. */
-  output[0] += output[10] << 4;
-  output[0] += output[10] << 1;
-  output[0] += output[10];
-
-  output[10] = 0;
-
-  /* Now output[1..9] are reduced, and |output[0]| < 2^26 + 19*281*2^29
-   * So |over| will be no more than 2^16. */
-  {
-    limb over = div_by_2_26(output[0]);
-    output[0] -= over << 26;
-    output[1] += over;
-  }
-
-  /* Now output[0,2..9] are reduced, and |output[1]| < 2^25 + 2^16 < 2^26. The
-   * bound on |output[1]| is sufficient to meet our needs. */
-}
-
-/* A helpful wrapper around fproduct: output = in * in2.
- *
- * On entry: |in[i]| < 2^27 and |in2[i]| < 2^27.
- *
- * output must be distinct to both inputs. The output is reduced degree
- * (indeed, one need only provide storage for 10 limbs) and |output[i]| < 2^26. */
-static void
-fmul(limb *output, const limb *in, const limb *in2) {
-  limb t[19];
-  fproduct(t, in, in2);
-  /* |t[i]| < 14*2^54 */
-  freduce_degree(t);
-  freduce_coefficients(t);
-  /* |t[i]| < 2^26 */
-  memcpy(output, t, sizeof(limb) * 10);
-}
-
-/* Square a number: output = in**2
- *
- * output must be distinct from the input. The inputs are reduced coefficient
- * form, the output is not.
- *
- * output[x] <= 14 * the largest product of the input limbs. */
-static void fsquare_inner(limb *output, const limb *in) {
-  output[0] =       ((limb) ((s32) in[0])) * ((s32) in[0]);
-  output[1] =  2 *  ((limb) ((s32) in[0])) * ((s32) in[1]);
-  output[2] =  2 * (((limb) ((s32) in[1])) * ((s32) in[1]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[2]));
-  output[3] =  2 * (((limb) ((s32) in[1])) * ((s32) in[2]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[3]));
-  output[4] =       ((limb) ((s32) in[2])) * ((s32) in[2]) +
-               4 *  ((limb) ((s32) in[1])) * ((s32) in[3]) +
-               2 *  ((limb) ((s32) in[0])) * ((s32) in[4]);
-  output[5] =  2 * (((limb) ((s32) in[2])) * ((s32) in[3]) +
-                    ((limb) ((s32) in[1])) * ((s32) in[4]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[5]));
-  output[6] =  2 * (((limb) ((s32) in[3])) * ((s32) in[3]) +
-                    ((limb) ((s32) in[2])) * ((s32) in[4]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[6]) +
-               2 *  ((limb) ((s32) in[1])) * ((s32) in[5]));
-  output[7] =  2 * (((limb) ((s32) in[3])) * ((s32) in[4]) +
-                    ((limb) ((s32) in[2])) * ((s32) in[5]) +
-                    ((limb) ((s32) in[1])) * ((s32) in[6]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[7]));
-  output[8] =       ((limb) ((s32) in[4])) * ((s32) in[4]) +
-               2 * (((limb) ((s32) in[2])) * ((s32) in[6]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[8]) +
-               2 * (((limb) ((s32) in[1])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[3])) * ((s32) in[5])));
-  output[9] =  2 * (((limb) ((s32) in[4])) * ((s32) in[5]) +
-                    ((limb) ((s32) in[3])) * ((s32) in[6]) +
-                    ((limb) ((s32) in[2])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[1])) * ((s32) in[8]) +
-                    ((limb) ((s32) in[0])) * ((s32) in[9]));
-  output[10] = 2 * (((limb) ((s32) in[5])) * ((s32) in[5]) +
-                    ((limb) ((s32) in[4])) * ((s32) in[6]) +
-                    ((limb) ((s32) in[2])) * ((s32) in[8]) +
-               2 * (((limb) ((s32) in[3])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[1])) * ((s32) in[9])));
-  output[11] = 2 * (((limb) ((s32) in[5])) * ((s32) in[6]) +
-                    ((limb) ((s32) in[4])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[3])) * ((s32) in[8]) +
-                    ((limb) ((s32) in[2])) * ((s32) in[9]));
-  output[12] =      ((limb) ((s32) in[6])) * ((s32) in[6]) +
-               2 * (((limb) ((s32) in[4])) * ((s32) in[8]) +
-               2 * (((limb) ((s32) in[5])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[3])) * ((s32) in[9])));
-  output[13] = 2 * (((limb) ((s32) in[6])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[5])) * ((s32) in[8]) +
-                    ((limb) ((s32) in[4])) * ((s32) in[9]));
-  output[14] = 2 * (((limb) ((s32) in[7])) * ((s32) in[7]) +
-                    ((limb) ((s32) in[6])) * ((s32) in[8]) +
-               2 *  ((limb) ((s32) in[5])) * ((s32) in[9]));
-  output[15] = 2 * (((limb) ((s32) in[7])) * ((s32) in[8]) +
-                    ((limb) ((s32) in[6])) * ((s32) in[9]));
-  output[16] =      ((limb) ((s32) in[8])) * ((s32) in[8]) +
-               4 *  ((limb) ((s32) in[7])) * ((s32) in[9]);
-  output[17] = 2 *  ((limb) ((s32) in[8])) * ((s32) in[9]);
-  output[18] = 2 *  ((limb) ((s32) in[9])) * ((s32) in[9]);
-}
-
-/* fsquare sets output = in^2.
- *
- * On entry: The |in| argument is in reduced coefficients form and |in[i]| <
- * 2^27.
- *
- * On exit: The |output| argument is in reduced coefficients form (indeed, one
- * need only provide storage for 10 limbs) and |out[i]| < 2^26. */
-static void
-fsquare(limb *output, const limb *in) {
-  limb t[19];
-  fsquare_inner(t, in);
-  /* |t[i]| < 14*2^54 because the largest product of two limbs will be <
-   * 2^(27+27) and fsquare_inner adds together, at most, 14 of those
-   * products. */
-  freduce_degree(t);
-  freduce_coefficients(t);
-  /* |t[i]| < 2^26 */
-  memcpy(output, t, sizeof(limb) * 10);
-}
-
-/* Take a little-endian, 32-byte number and expand it into polynomial form */
-static void
-fexpand(limb *output, const u8 *input) {
-#define F(n,start,shift,mask) \
-  output[n] = ((((limb) input[start + 0]) | \
-                ((limb) input[start + 1]) << 8 | \
-                ((limb) input[start + 2]) << 16 | \
-                ((limb) input[start + 3]) << 24) >> shift) & mask;
-  F(0, 0, 0, 0x3ffffff);
-  F(1, 3, 2, 0x1ffffff);
-  F(2, 6, 3, 0x3ffffff);
-  F(3, 9, 5, 0x1ffffff);
-  F(4, 12, 6, 0x3ffffff);
-  F(5, 16, 0, 0x1ffffff);
-  F(6, 19, 1, 0x3ffffff);
-  F(7, 22, 3, 0x1ffffff);
-  F(8, 25, 4, 0x3ffffff);
-  F(9, 28, 6, 0x1ffffff);
-#undef F
-}
-
-#if (-32 >> 1) != -16
-#error "This code only works when >> does sign-extension on negative numbers"
-#endif
-
-/* s32_eq returns 0xffffffff iff a == b and zero otherwise. */
-static s32 s32_eq(s32 a, s32 b) {
-  a = ~(a ^ b);
-  a &= a << 16;
-  a &= a << 8;
-  a &= a << 4;
-  a &= a << 2;
-  a &= a << 1;
-  return a >> 31;
-}
-
-/* s32_gte returns 0xffffffff if a >= b and zero otherwise, where a and b are
- * both non-negative. */
-static s32 s32_gte(s32 a, s32 b) {
-  a -= b;
-  /* a >= 0 iff a >= b. */
-  return ~(a >> 31);
-}
-
-/* Take a fully reduced polynomial form number and contract it into a
- * little-endian, 32-byte array.
- *
- * On entry: |input_limbs[i]| < 2^26 */
-static void
-fcontract(u8 *output, limb *input_limbs) {
-  int i;
-  int j;
-  s32 input[10];
-  s32 mask;
-
-  /* |input_limbs[i]| < 2^26, so it's valid to convert to an s32. */
-  for (i = 0; i < 10; i++) {
-    input[i] = input_limbs[i];
-  }
-
-  for (j = 0; j < 2; ++j) {
-    for (i = 0; i < 9; ++i) {
-      if ((i & 1) == 1) {
-        /* This calculation is a time-invariant way to make input[i]
-         * non-negative by borrowing from the next-larger limb. */
-        const s32 mask = input[i] >> 31;
-        const s32 carry = -((input[i] & mask) >> 25);
-        input[i] = input[i] + (carry << 25);
-        input[i+1] = input[i+1] - carry;
-      } else {
-        const s32 mask = input[i] >> 31;
-        const s32 carry = -((input[i] & mask) >> 26);
-        input[i] = input[i] + (carry << 26);
-        input[i+1] = input[i+1] - carry;
-      }
-    }
-
-    /* There's no greater limb for input[9] to borrow from, but we can multiply
-     * by 19 and borrow from input[0], which is valid mod 2^255-19. */
-    {
-      const s32 mask = input[9] >> 31;
-      const s32 carry = -((input[9] & mask) >> 25);
-      input[9] = input[9] + (carry << 25);
-      input[0] = input[0] - (carry * 19);
-    }
-
-    /* After the first iteration, input[1..9] are non-negative and fit within
-     * 25 or 26 bits, depending on position. However, input[0] may be
-     * negative. */
-  }
-
-  /* The first borrow-propagation pass above ended with every limb
-     except (possibly) input[0] non-negative.
-
-     If input[0] was negative after the first pass, then it was because of a
-     carry from input[9]. On entry, input[9] < 2^26 so the carry was, at most,
-     one, since (2**26-1) >> 25 = 1. Thus input[0] >= -19.
-
-     In the second pass, each limb is decreased by at most one. Thus the second
-     borrow-propagation pass could only have wrapped around to decrease
-     input[0] again if the first pass left input[0] negative *and* input[1]
-     through input[9] were all zero.  In that case, input[1] is now 2^25 - 1,
-     and this last borrow-propagation step will leave input[1] non-negative. */
-  {
-    const s32 mask = input[0] >> 31;
-    const s32 carry = -((input[0] & mask) >> 26);
-    input[0] = input[0] + (carry << 26);
-    input[1] = input[1] - carry;
-  }
-
-  /* All input[i] are now non-negative. However, there might be values between
-   * 2^25 and 2^26 in a limb which is, nominally, 25 bits wide. */
-  for (j = 0; j < 2; j++) {
-    for (i = 0; i < 9; i++) {
-      if ((i & 1) == 1) {
-        const s32 carry = input[i] >> 25;
-        input[i] &= 0x1ffffff;
-        input[i+1] += carry;
-      } else {
-        const s32 carry = input[i] >> 26;
-        input[i] &= 0x3ffffff;
-        input[i+1] += carry;
-      }
-    }
-
-    {
-      const s32 carry = input[9] >> 25;
-      input[9] &= 0x1ffffff;
-      input[0] += 19*carry;
-    }
-  }
-
-  /* If the first carry-chain pass, just above, ended up with a carry from
-   * input[9], and that caused input[0] to be out-of-bounds, then input[0] was
-   * < 2^26 + 2*19, because the carry was, at most, two.
-   *
-   * If the second pass carried from input[9] again then input[0] is < 2*19 and
-   * the input[9] -> input[0] carry didn't push input[0] out of bounds. */
-
-  /* It still remains the case that input might be between 2^255-19 and 2^255.
-   * In this case, input[1..9] must take their maximum value and input[0] must
-   * be >= (2^255-19) & 0x3ffffff, which is 0x3ffffed. */
-  mask = s32_gte(input[0], 0x3ffffed);
-  for (i = 1; i < 10; i++) {
-    if ((i & 1) == 1) {
-      mask &= s32_eq(input[i], 0x1ffffff);
-    } else {
-      mask &= s32_eq(input[i], 0x3ffffff);
-    }
-  }
-
-  /* mask is either 0xffffffff (if input >= 2^255-19) and zero otherwise. Thus
-   * this conditionally subtracts 2^255-19. */
-  input[0] -= mask & 0x3ffffed;
-
-  for (i = 1; i < 10; i++) {
-    if ((i & 1) == 1) {
-      input[i] -= mask & 0x1ffffff;
-    } else {
-      input[i] -= mask & 0x3ffffff;
-    }
-  }
-
-  input[1] <<= 2;
-  input[2] <<= 3;
-  input[3] <<= 5;
-  input[4] <<= 6;
-  input[6] <<= 1;
-  input[7] <<= 3;
-  input[8] <<= 4;
-  input[9] <<= 6;
-#define F(i, s) \
-  output[s+0] |=  input[i] & 0xff; \
-  output[s+1]  = (input[i] >> 8) & 0xff; \
-  output[s+2]  = (input[i] >> 16) & 0xff; \
-  output[s+3]  = (input[i] >> 24) & 0xff;
-  output[0] = 0;
-  output[16] = 0;
-  F(0,0);
-  F(1,3);
-  F(2,6);
-  F(3,9);
-  F(4,12);
-  F(5,16);
-  F(6,19);
-  F(7,22);
-  F(8,25);
-  F(9,28);
-#undef F
-}
-
-/* Input: Q, Q', Q-Q'
- * Output: 2Q, Q+Q'
- *
- *   x2 z3: long form
- *   x3 z3: long form
- *   x z: short form, destroyed
- *   xprime zprime: short form, destroyed
- *   qmqp: short form, preserved
- *
- * On entry and exit, the absolute value of the limbs of all inputs and outputs
- * are < 2^26. */
-static void fmonty(limb *x2, limb *z2,  /* output 2Q */
-                   limb *x3, limb *z3,  /* output Q + Q' */
-                   limb *x, limb *z,    /* input Q */
-                   limb *xprime, limb *zprime,  /* input Q' */
-                   const limb *qmqp /* input Q - Q' */) {
-  limb origx[10], origxprime[10], zzz[19], xx[19], zz[19], xxprime[19],
-        zzprime[19], zzzprime[19], xxxprime[19];
-
-  memcpy(origx, x, 10 * sizeof(limb));
-  fsum(x, z);
-  /* |x[i]| < 2^27 */
-  fdifference(z, origx);  /* does x - z */
-  /* |z[i]| < 2^27 */
-
-  memcpy(origxprime, xprime, sizeof(limb) * 10);
-  fsum(xprime, zprime);
-  /* |xprime[i]| < 2^27 */
-  fdifference(zprime, origxprime);
-  /* |zprime[i]| < 2^27 */
-  fproduct(xxprime, xprime, z);
-  /* |xxprime[i]| < 14*2^54: the largest product of two limbs will be <
-   * 2^(27+27) and fproduct adds together, at most, 14 of those products.
-   * (Approximating that to 2^58 doesn't work out.) */
-  fproduct(zzprime, x, zprime);
-  /* |zzprime[i]| < 14*2^54 */
-  freduce_degree(xxprime);
-  freduce_coefficients(xxprime);
-  /* |xxprime[i]| < 2^26 */
-  freduce_degree(zzprime);
-  freduce_coefficients(zzprime);
-  /* |zzprime[i]| < 2^26 */
-  memcpy(origxprime, xxprime, sizeof(limb) * 10);
-  fsum(xxprime, zzprime);
-  /* |xxprime[i]| < 2^27 */
-  fdifference(zzprime, origxprime);
-  /* |zzprime[i]| < 2^27 */
-  fsquare(xxxprime, xxprime);
-  /* |xxxprime[i]| < 2^26 */
-  fsquare(zzzprime, zzprime);
-  /* |zzzprime[i]| < 2^26 */
-  fproduct(zzprime, zzzprime, qmqp);
-  /* |zzprime[i]| < 14*2^52 */
-  freduce_degree(zzprime);
-  freduce_coefficients(zzprime);
-  /* |zzprime[i]| < 2^26 */
-  memcpy(x3, xxxprime, sizeof(limb) * 10);
-  memcpy(z3, zzprime, sizeof(limb) * 10);
-
-  fsquare(xx, x);
-  /* |xx[i]| < 2^26 */
-  fsquare(zz, z);
-  /* |zz[i]| < 2^26 */
-  fproduct(x2, xx, zz);
-  /* |x2[i]| < 14*2^52 */
-  freduce_degree(x2);
-  freduce_coefficients(x2);
-  /* |x2[i]| < 2^26 */
-  fdifference(zz, xx);  /* does zz = xx - zz */
-  /* |zz[i]| < 2^27 */
-  memset(zzz + 10, 0, sizeof(limb) * 9);
-  fscalar_product(zzz, zz, 121665);
-  /* |zzz[i]| < 2^(27+17) */
-  /* No need to call freduce_degree here:
-     fscalar_product doesn't increase the degree of its input. */
-  freduce_coefficients(zzz);
-  /* |zzz[i]| < 2^26 */
-  fsum(zzz, xx);
-  /* |zzz[i]| < 2^27 */
-  fproduct(z2, zz, zzz);
-  /* |z2[i]| < 14*2^(26+27) */
-  freduce_degree(z2);
-  freduce_coefficients(z2);
-  /* |z2|i| < 2^26 */
-}
-
-/* Conditionally swap two reduced-form limb arrays if 'iswap' is 1, but leave
- * them unchanged if 'iswap' is 0.  Runs in data-invariant time to avoid
- * side-channel attacks.
- *
- * NOTE that this function requires that 'iswap' be 1 or 0; other values give
- * wrong results.  Also, the two limb arrays must be in reduced-coefficient,
- * reduced-degree form: the values in a[10..19] or b[10..19] aren't swapped,
- * and all all values in a[0..9],b[0..9] must have magnitude less than
- * INT32_MAX. */
-static void
-swap_conditional(limb a[19], limb b[19], limb iswap) {
-  unsigned i;
-  const s32 swap = (s32) -iswap;
-
-  for (i = 0; i < 10; ++i) {
-    const s32 x = swap & ( ((s32)a[i]) ^ ((s32)b[i]) );
-    a[i] = ((s32)a[i]) ^ x;
-    b[i] = ((s32)b[i]) ^ x;
-  }
-}
-
-/* Calculates nQ where Q is the x-coordinate of a point on the curve
- *
- *   resultx/resultz: the x coordinate of the resulting curve point (short form)
- *   n: a little endian, 32-byte number
- *   q: a point of the curve (short form) */
-static void
-cmult(limb *resultx, limb *resultz, const u8 *n, const limb *q) {
-  limb a[19] = {0}, b[19] = {1}, c[19] = {1}, d[19] = {0};
-  limb *nqpqx = a, *nqpqz = b, *nqx = c, *nqz = d, *t;
-  limb e[19] = {0}, f[19] = {1}, g[19] = {0}, h[19] = {1};
-  limb *nqpqx2 = e, *nqpqz2 = f, *nqx2 = g, *nqz2 = h;
-
-  unsigned i, j;
-
-  memcpy(nqpqx, q, sizeof(limb) * 10);
-
-  for (i = 0; i < 32; ++i) {
-    u8 byte = n[31 - i];
-    for (j = 0; j < 8; ++j) {
-      const limb bit = byte >> 7;
-
-      swap_conditional(nqx, nqpqx, bit);
-      swap_conditional(nqz, nqpqz, bit);
-      fmonty(nqx2, nqz2,
-             nqpqx2, nqpqz2,
-             nqx, nqz,
-             nqpqx, nqpqz,
-             q);
-      swap_conditional(nqx2, nqpqx2, bit);
-      swap_conditional(nqz2, nqpqz2, bit);
-
-      t = nqx;
-      nqx = nqx2;
-      nqx2 = t;
-      t = nqz;
-      nqz = nqz2;
-      nqz2 = t;
-      t = nqpqx;
-      nqpqx = nqpqx2;
-      nqpqx2 = t;
-      t = nqpqz;
-      nqpqz = nqpqz2;
-      nqpqz2 = t;
-
-      byte <<= 1;
-    }
-  }
-
-  memcpy(resultx, nqx, sizeof(limb) * 10);
-  memcpy(resultz, nqz, sizeof(limb) * 10);
-}
-
-/* -----------------------------------------------------------------------------
- * Shamelessly copied from djb's code
- * ----------------------------------------------------------------------------- */
-static void
-crecip(limb *out, const limb *z) {
-  limb z2[10];
-  limb z9[10];
-  limb z11[10];
-  limb z2_5_0[10];
-  limb z2_10_0[10];
-  limb z2_20_0[10];
-  limb z2_50_0[10];
-  limb z2_100_0[10];
-  limb t0[10];
-  limb t1[10];
-  int i;
-
-  /* 2 */ fsquare(z2,z);
-  /* 4 */ fsquare(t1,z2);
-  /* 8 */ fsquare(t0,t1);
-  /* 9 */ fmul(z9,t0,z);
-  /* 11 */ fmul(z11,z9,z2);
-  /* 22 */ fsquare(t0,z11);
-  /* 2^5 - 2^0 = 31 */ fmul(z2_5_0,t0,z9);
-
-  /* 2^6 - 2^1 */ fsquare(t0,z2_5_0);
-  /* 2^7 - 2^2 */ fsquare(t1,t0);
-  /* 2^8 - 2^3 */ fsquare(t0,t1);
-  /* 2^9 - 2^4 */ fsquare(t1,t0);
-  /* 2^10 - 2^5 */ fsquare(t0,t1);
-  /* 2^10 - 2^0 */ fmul(z2_10_0,t0,z2_5_0);
-
-  /* 2^11 - 2^1 */ fsquare(t0,z2_10_0);
-  /* 2^12 - 2^2 */ fsquare(t1,t0);
-  /* 2^20 - 2^10 */ for (i = 2;i < 10;i += 2) { fsquare(t0,t1); fsquare(t1,t0); }
-  /* 2^20 - 2^0 */ fmul(z2_20_0,t1,z2_10_0);
-
-  /* 2^21 - 2^1 */ fsquare(t0,z2_20_0);
-  /* 2^22 - 2^2 */ fsquare(t1,t0);
-  /* 2^40 - 2^20 */ for (i = 2;i < 20;i += 2) { fsquare(t0,t1); fsquare(t1,t0); }
-  /* 2^40 - 2^0 */ fmul(t0,t1,z2_20_0);
-
-  /* 2^41 - 2^1 */ fsquare(t1,t0);
-  /* 2^42 - 2^2 */ fsquare(t0,t1);
-  /* 2^50 - 2^10 */ for (i = 2;i < 10;i += 2) { fsquare(t1,t0); fsquare(t0,t1); }
-  /* 2^50 - 2^0 */ fmul(z2_50_0,t0,z2_10_0);
-
-  /* 2^51 - 2^1 */ fsquare(t0,z2_50_0);
-  /* 2^52 - 2^2 */ fsquare(t1,t0);
-  /* 2^100 - 2^50 */ for (i = 2;i < 50;i += 2) { fsquare(t0,t1); fsquare(t1,t0); }
-  /* 2^100 - 2^0 */ fmul(z2_100_0,t1,z2_50_0);
-
-  /* 2^101 - 2^1 */ fsquare(t1,z2_100_0);
-  /* 2^102 - 2^2 */ fsquare(t0,t1);
-  /* 2^200 - 2^100 */ for (i = 2;i < 100;i += 2) { fsquare(t1,t0); fsquare(t0,t1); }
-  /* 2^200 - 2^0 */ fmul(t1,t0,z2_100_0);
-
-  /* 2^201 - 2^1 */ fsquare(t0,t1);
-  /* 2^202 - 2^2 */ fsquare(t1,t0);
-  /* 2^250 - 2^50 */ for (i = 2;i < 50;i += 2) { fsquare(t0,t1); fsquare(t1,t0); }
-  /* 2^250 - 2^0 */ fmul(t0,t1,z2_50_0);
-
-  /* 2^251 - 2^1 */ fsquare(t1,t0);
-  /* 2^252 - 2^2 */ fsquare(t0,t1);
-  /* 2^253 - 2^3 */ fsquare(t1,t0);
-  /* 2^254 - 2^4 */ fsquare(t0,t1);
-  /* 2^255 - 2^5 */ fsquare(t1,t0);
-  /* 2^255 - 21 */ fmul(out,t1,z11);
-}
-
-int
-curve25519_donna(u8 *mypublic, const u8 *secret, const u8 *basepoint) {
-  limb bp[10], x[10], z[11], zmone[10];
-  uint8_t e[32];
-  int i;
-
-  for (i = 0; i < 32; ++i) e[i] = secret[i];
-  e[0] &= 248;
-  e[31] &= 127;
-  e[31] |= 64;
-
-  fexpand(bp, basepoint);
-  cmult(x, z, e, bp);
-  crecip(zmone, z);
-  fmul(z, x, zmone);
-  fcontract(mypublic, z);
-  return 0;
-}

debian/changelog

@@ -1,3 +1,57 @@
+dropbear (2024.85-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Thu, 25 Apr 2024 22:51:57 +0800
+
+dropbear (2024.84-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Thu, 4 Apr 2024 22:51:57 +0800
+
+dropbear (2022.83-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Mon, 14 Nov 2022 22:51:57 +0800
+
+dropbear (2022.82-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Fri, 1 Apr 2022 22:51:57 +0800
+
+dropbear (2020.81-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Thu, 29 Oct 2020 22:51:57 +0800
+
+dropbear (2020.80-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Fri, 26 Jun 2020 22:51:57 +0800
+
+dropbear (2020.79-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Mon, 15 Jun 2020 22:51:57 +0800
+
+dropbear (2019.78-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Wed, 27 Mar 2019 22:51:57 +0800
+
+dropbear (2019.77-0.1) unstable; urgency=low
+
+  * New upstream release.
+
+ -- Matt Johnston <matt@ucc.asn.au>  Sat, 23 Mar 2019 22:51:57 +0800
+
 dropbear (2018.76-0.1) unstable; urgency=low
 
   * New upstream release.

debian/dropbear.docs

@@ -1,3 +1,3 @@
-README
+README.md
 debian/README.runit
 debian/README.Debian.diet

debian/dropbear.init

@@ -25,7 +25,7 @@ set -e
 cancel() { echo "$1" >&2; exit 0; };
 test ! -r /etc/default/dropbear || . /etc/default/dropbear
 test -x "$DAEMON" || cancel "$DAEMON does not exist or is not executable."
-test ! -x /usr/sbin/update-service || ! update-service --check dropbear ||
+test ! -x /usr/sbin/update-service || ! update-service --check dropbear || \
   cancel 'The dropbear service is controlled through runit, use the sv(8) program'
 
 test -z "$DROPBEAR_BANNER" || \

debian/rules

@@ -77,9 +77,9 @@ install: deb-checkdir deb-checkuid build-stamp
 	# man pages
 	install -d -m0755 '$(DIR)'/usr/share/man/man8
 	install -d -m0755 '$(DIR)'/usr/share/man/man1
-	install -m644 dropbear.8 '$(DIR)'/usr/share/man/man8/
+	install -m644 manpages/dropbear.8 '$(DIR)'/usr/share/man/man8/
 	for i in dbclient.1 dropbearkey.1 dropbearconvert.1; do \
-	  install -m644 $$i '$(DIR)'/usr/share/man/man1/ || exit 1; \
+	  install -m644 manpages/$$i '$(DIR)'/usr/share/man/man1/ || exit 1; \
 	done
 	gzip -9 '$(DIR)'/usr/share/man/man8/*.8
 	gzip -9 '$(DIR)'/usr/share/man/man1/*.1

fuzz/fuzz-common.c

@@ -0,0 +1,398 @@
+#define FUZZ_NO_REPLACE_STDERR
+#define FUZZ_NO_REPLACE_GETPW
+#include "includes.h"
+
+#include "includes.h"
+#include "dbutil.h"
+#include "runopts.h"
+#include "crypto_desc.h"
+#include "session.h"
+#include "dbrandom.h"
+#include "bignum.h"
+#include "atomicio.h"
+#include "fuzz-wrapfd.h"
+#include "fuzz.h"
+
+struct dropbear_fuzz_options fuzz;
+
+static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param);
+static void load_fixed_hostkeys(void);
+static void load_fixed_client_key(void);
+
+// This runs automatically before main, due to contructor attribute in fuzz.h
+void fuzz_early_setup(void) {
+    /* Set stderr to point to normal stderr by default */
+    fuzz.fake_stderr = stderr;
+}
+
+void fuzz_common_setup(void) {
+	disallow_core();
+    fuzz.fuzzing = 1;
+    fuzz.wrapfds = 1;
+    fuzz.do_jmp = 1;
+    fuzz.input = m_malloc(sizeof(buffer));
+    _dropbear_log = fuzz_dropbear_log;
+    crypto_init();
+    fuzz_seed("start", 5);
+    /* let any messages get flushed */
+    setlinebuf(stdout);
+#if DEBUG_TRACE
+    if (debug_trace)
+    {
+        fprintf(stderr, "Dropbear fuzzer: -v specified, not disabling stderr output\n");
+    }
+    else
+#endif
+    if (getenv("DROPBEAR_KEEP_STDERR")) {
+        fprintf(stderr, "Dropbear fuzzer: DROPBEAR_KEEP_STDERR, not disabling stderr output\n");
+    } 
+    else 
+    {
+        fprintf(stderr, "Dropbear fuzzer: Disabling stderr output\n");
+        fuzz.fake_stderr = fopen("/dev/null", "w");
+        assert(fuzz.fake_stderr);
+    }
+}
+
+int fuzz_set_input(const uint8_t *Data, size_t Size) {
+
+    fuzz.input->data = (unsigned char*)Data;
+    fuzz.input->size = Size;
+    fuzz.input->len = Size;
+    fuzz.input->pos = 0;
+
+    memset(&ses, 0x0, sizeof(ses));
+    memset(&svr_ses, 0x0, sizeof(svr_ses));
+    memset(&cli_ses, 0x0, sizeof(cli_ses));
+    wrapfd_setup(fuzz.input);
+    // printhex("input", fuzz.input->data, fuzz.input->len);
+
+    fuzz_seed(fuzz.input->data, MIN(fuzz.input->len, 16));
+
+    return DROPBEAR_SUCCESS;
+}
+
+#if DEBUG_TRACE
+static void fuzz_dropbear_log(int UNUSED(priority), const char* format, va_list param) {
+    if (debug_trace) {
+        char printbuf[1024];
+        vsnprintf(printbuf, sizeof(printbuf), format, param);
+        fprintf(stderr, "%s\n", printbuf);
+    }
+}
+#else
+static void fuzz_dropbear_log(int UNUSED(priority), const char* UNUSED(format), va_list UNUSED(param)) {
+    /* No print */
+}
+#endif /* DEBUG_TRACE */
+
+void fuzz_svr_setup(void) {
+    fuzz_common_setup();
+    
+    _dropbear_exit = svr_dropbear_exit;
+
+    char *argv[] = { 
+		"dropbear",
+        "-E", 
+    };
+
+    int argc = sizeof(argv) / sizeof(*argv);
+    svr_getopts(argc, argv);
+
+    load_fixed_hostkeys();
+}
+
+void fuzz_svr_hook_preloop() {
+    if (fuzz.svr_postauth) {
+        ses.authstate.authdone = 1;
+        fill_passwd("root");
+    }
+}
+
+void fuzz_cli_setup(void) {
+    fuzz_common_setup();
+    
+	_dropbear_exit = cli_dropbear_exit;
+	_dropbear_log = cli_dropbear_log;
+
+    char *argv[] = { 
+		"dbclient",
+		"-y",
+        "localhost",
+        "uptime"
+    };
+
+    int argc = sizeof(argv) / sizeof(*argv);
+    cli_getopts(argc, argv);
+
+    load_fixed_client_key();
+    /* Avoid password prompt */
+    setenv(DROPBEAR_PASSWORD_ENV, "password", 1);
+}
+
+#include "fuzz-hostkeys.c"   
+
+static void load_fixed_client_key(void) {
+
+    buffer *b = buf_new(3000);
+    sign_key *key;
+    enum signkey_type keytype;
+
+    key = new_sign_key();
+    keytype = DROPBEAR_SIGNKEY_ANY;
+    buf_putbytes(b, keyed25519, keyed25519_len);
+    buf_setpos(b, 0);
+    if (buf_get_priv_key(b, key, &keytype) == DROPBEAR_FAILURE) {
+        dropbear_exit("failed fixed ed25519 hostkey");
+    }
+    list_append(cli_opts.privkeys, key);
+
+    buf_free(b);
+}
+
+static void load_fixed_hostkeys(void) {
+
+    buffer *b = buf_new(3000);
+    enum signkey_type type;
+
+    TRACE(("load fixed hostkeys"))
+
+    svr_opts.hostkey = new_sign_key();
+
+    buf_setlen(b, 0);
+    buf_putbytes(b, keyr, keyr_len);
+    buf_setpos(b, 0);
+    type = DROPBEAR_SIGNKEY_RSA;
+    if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
+        dropbear_exit("failed fixed rsa hostkey");
+    }
+
+    buf_setlen(b, 0);
+    buf_putbytes(b, keyd, keyd_len);
+    buf_setpos(b, 0);
+    type = DROPBEAR_SIGNKEY_DSS;
+    if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
+        dropbear_exit("failed fixed dss hostkey");
+    }
+
+    buf_setlen(b, 0);
+    buf_putbytes(b, keye, keye_len);
+    buf_setpos(b, 0);
+    type = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
+    if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
+        dropbear_exit("failed fixed ecdsa hostkey");
+    }
+
+    buf_setlen(b, 0);
+    buf_putbytes(b, keyed25519, keyed25519_len);
+    buf_setpos(b, 0);
+    type = DROPBEAR_SIGNKEY_ED25519;
+    if (buf_get_priv_key(b, svr_opts.hostkey, &type) == DROPBEAR_FAILURE) {
+        dropbear_exit("failed fixed ed25519 hostkey");
+    }
+
+    buf_free(b);
+}
+
+void fuzz_kex_fakealgos(void) {
+    ses.newkeys->recv.crypt_mode = &dropbear_mode_none;
+    ses.newkeys->recv.algo_mac = &dropbear_nohash;
+}
+
+void fuzz_get_socket_address(int UNUSED(fd), char **local_host, char **local_port,
+                        char **remote_host, char **remote_port, int UNUSED(host_lookup)) {
+    if (local_host) {
+        *local_host = m_strdup("fuzzlocalhost");
+    }
+    if (local_port) {
+        *local_port = m_strdup("1234");
+    }
+    if (remote_host) {
+        *remote_host = m_strdup("fuzzremotehost");
+    }
+    if (remote_port) {
+        *remote_port = m_strdup("9876");
+    }
+}
+
+/* cut down version of svr_send_msg_kexdh_reply() that skips slow maths. Still populates structures */
+void fuzz_fake_send_kexdh_reply(void) {
+    assert(!ses.dh_K);
+    m_mp_alloc_init_multi(&ses.dh_K, NULL);
+    mp_set_ul(ses.dh_K, 12345678uL);
+    finish_kexhashbuf();
+}
+
+/* fake version of spawn_command() */
+int fuzz_spawn_command(int *ret_writefd, int *ret_readfd, int *ret_errfd, pid_t *ret_pid) {
+    *ret_writefd = wrapfd_new_dummy();
+    *ret_readfd = wrapfd_new_dummy();
+    if (ret_errfd) {
+        *ret_errfd = wrapfd_new_dummy();
+    }
+    if (*ret_writefd == -1 || *ret_readfd == -1 || (ret_errfd && *ret_errfd == -1)) {
+        m_close(*ret_writefd);
+        m_close(*ret_readfd);
+        if (ret_errfd) {
+            m_close(*ret_errfd);
+        }
+        return DROPBEAR_FAILURE;
+    } else {
+        *ret_pid = 999;
+        return DROPBEAR_SUCCESS;
+
+    }
+}
+
+/* Fake dropbear_listen, always returns failure for now.
+TODO make it sometimes return success with wrapfd_new_dummy() sockets.
+Making the listeners fake a new incoming connection will be harder. */
+/* Listen on address:port. 
+ * Special cases are address of "" listening on everything,
+ * and address of NULL listening on localhost only.
+ * Returns the number of sockets bound on success, or -1 on failure. On
+ * failure, if errstring wasn't NULL, it'll be a newly malloced error
+ * string.*/
+int fuzz_dropbear_listen(const char* UNUSED(address), const char* UNUSED(port),
+        int *UNUSED(socks), unsigned int UNUSED(sockcount), char **errstring, int *UNUSED(maxfd)) {
+    if (errstring) {
+        *errstring = m_strdup("fuzzing can't listen (yet)");
+    }
+    return -1;
+}
+
+int fuzz_run_server(const uint8_t *Data, size_t Size, int skip_kexmaths, int postauth) {
+    static int once = 0;
+    if (!once) {
+        fuzz_svr_setup();
+        fuzz.skip_kexmaths = skip_kexmaths;
+        once = 1;
+    }
+
+    fuzz.svr_postauth = postauth;
+
+    if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+        return 0;
+    }
+
+    uint32_t wrapseed;
+    genrandom((void*)&wrapseed, sizeof(wrapseed));
+    wrapfd_setseed(wrapseed);
+
+    int fakesock = wrapfd_new_fuzzinput();
+
+    m_malloc_set_epoch(1);
+    fuzz.do_jmp = 1;
+    if (setjmp(fuzz.jmp) == 0) {
+        svr_session(fakesock, fakesock);
+        m_malloc_free_epoch(1, 0);
+    } else {
+        fuzz.do_jmp = 0;
+        m_malloc_free_epoch(1, 1);
+        TRACE(("dropbear_exit longjmped"))
+        /* dropbear_exit jumped here */
+    }
+
+    return 0;
+}
+
+int fuzz_run_client(const uint8_t *Data, size_t Size, int skip_kexmaths) {
+    static int once = 0;
+    if (!once) {
+        fuzz_cli_setup();
+        fuzz.skip_kexmaths = skip_kexmaths;
+        once = 1;
+    }
+
+    if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+        return 0;
+    }
+
+    // Allow to proceed sooner
+    ses.kexstate.donefirstkex = 1;
+
+    uint32_t wrapseed;
+    genrandom((void*)&wrapseed, sizeof(wrapseed));
+    wrapfd_setseed(wrapseed);
+
+    int fakesock = wrapfd_new_fuzzinput();
+
+    m_malloc_set_epoch(1);
+    fuzz.do_jmp = 1;
+    if (setjmp(fuzz.jmp) == 0) {
+        cli_session(fakesock, fakesock, NULL, 0);
+        m_malloc_free_epoch(1, 0);
+    } else {
+        fuzz.do_jmp = 0;
+        m_malloc_free_epoch(1, 1);
+        TRACE(("dropbear_exit longjmped"))
+        /* dropbear_exit jumped here */
+    }
+
+    return 0;
+}
+
+const void* fuzz_get_algo(const algo_type *algos, const char* name) {
+    const algo_type *t;
+    for (t = algos; t->name; t++) {
+        if (strcmp(t->name, name) == 0) {
+            return t->data;
+        }
+    }
+    assert(0);
+}
+
+void fuzz_dump(const unsigned char* data, size_t len) {
+    if (fuzz.dumping) {
+        TRACE(("dump %zu", len))
+        assert(atomicio(vwrite, fuzz.recv_dumpfd, (void*)data, len) == len);
+    }
+}
+
+static struct passwd pwd_root = {
+    .pw_name = "root",
+    .pw_passwd = "!",
+    .pw_uid = 0,
+    .pw_gid = 0,
+    .pw_dir = "/root",
+    .pw_shell = "/bin/sh",
+};
+
+static struct passwd pwd_other = {
+    .pw_name = "other",
+    .pw_passwd = "!",
+    .pw_uid = 100,
+    .pw_gid = 100,
+    .pw_dir = "/home/other",
+    .pw_shell = "/bin/sh",
+};
+
+
+/* oss-fuzz runs fuzzers under minijail, without /etc/passwd.
+We provide sufficient values for the fuzzers to run */
+struct passwd* fuzz_getpwnam(const char *login) {
+    if (!fuzz.fuzzing) {
+        return getpwnam(login);
+    }
+    if (strcmp(login, pwd_other.pw_name) == 0) {
+        return &pwd_other;
+    }
+    if (strcmp(login, pwd_root.pw_name) == 0) {
+        return &pwd_root;
+    }
+    return NULL;
+}
+
+struct passwd* fuzz_getpwuid(uid_t uid) {
+    if (!fuzz.fuzzing) {
+        return getpwuid(uid);
+    }
+    if (uid == pwd_other.pw_uid) {
+        return &pwd_other;
+    }
+    if (uid == pwd_root.pw_uid) {
+        return &pwd_root;
+    }
+    return NULL;
+}
+

fuzz/fuzz-harness.c

@@ -0,0 +1,66 @@
+#include "includes.h"
+#include "buffer.h"
+#include "dbutil.h"
+
+extern int LLVMFuzzerTestOneInput(const unsigned char *data, size_t size);
+
+int main(int argc, char ** argv) {
+    int i;
+    buffer *input = buf_new(100000);
+    int quiet = 0;
+
+    for (i = 1; i < argc; i++) {
+#if DEBUG_TRACE
+        if (strcmp(argv[i], "-v") == 0) {
+            debug_trace++;
+            fprintf(stderr, "debug level -> %d\n", debug_trace);
+        }
+#endif
+        if (strcmp(argv[i], "-q") == 0) {
+            printf("Running quiet\n");
+            quiet = 1;
+        }
+    }
+
+    int old_fuzz_wrapfds = 0;
+    for (i = 1; i < argc; i++) {
+        if (argv[i][0] == '-') {
+            /* ignore arguments */
+            continue;
+        }
+
+        char* fn = argv[i];
+        buf_setlen(input, 0);
+        buf_readfile(input, fn);
+        buf_setpos(input, 0);
+
+		/* Run twice to catch problems with statefulness */
+        fuzz.wrapfds = old_fuzz_wrapfds;
+        if (!quiet) {
+            printf("Running %s once \n", fn);
+        }
+        LLVMFuzzerTestOneInput(input->data, input->len);
+        if (!quiet) {
+            printf("Running %s twice \n", fn);
+        }
+        LLVMFuzzerTestOneInput(input->data, input->len);
+        if (!quiet) {
+            printf("Done %s\n", fn);
+        }
+
+        /* Disable wrapfd so it won't interfere with buf_readfile() above */
+        old_fuzz_wrapfds = fuzz.wrapfds;
+        fuzz.wrapfds = 0;
+    }
+
+    printf("Finished\n");
+
+    return 0;
+}
+
+// Just to let it link
+size_t LLVMFuzzerMutate(uint8_t *UNUSED(Data), size_t UNUSED(Size), size_t UNUSED(MaxSize)) {
+    printf("standalone fuzzer harness shouldn't call LLVMFuzzerMutate");
+    abort();
+    return 0;
+}

fuzz/fuzz-hostkeys.c

@@ -0,0 +1,140 @@
+/* To be included in fuzz-common.c */
+
+static unsigned char keyr[] = {
+  0x00, 0x00, 0x00, 0x07, 0x73, 0x73, 0x68, 0x2d, 0x72, 0x73, 0x61, 0x00,
+  0x00, 0x00, 0x03, 0x01, 0x00, 0x01, 0x00, 0x00, 0x01, 0x01, 0x00, 0xb1,
+  0x06, 0x95, 0xc9, 0xa8, 0x38, 0xb9, 0x99, 0x91, 0xb5, 0x17, 0x39, 0xb9,
+  0xfa, 0xa4, 0x49, 0xf8, 0x2a, 0x4c, 0x14, 0xbd, 0xb6, 0x85, 0xdb, 0x38,
+  0x99, 0x44, 0xfa, 0xd6, 0xaa, 0x67, 0xef, 0x00, 0x75, 0x2b, 0x6a, 0x5c,
+  0x1b, 0x50, 0xa8, 0x52, 0xf9, 0xa7, 0xee, 0xe2, 0xb3, 0x80, 0x38, 0x92,
+  0x20, 0x86, 0x7c, 0xe5, 0x89, 0xb3, 0x06, 0xe4, 0x3b, 0xd1, 0xe2, 0x45,
+  0xea, 0xc1, 0xd5, 0x8e, 0x05, 0xfb, 0x90, 0x29, 0xd9, 0x41, 0xb3, 0x05,
+  0x31, 0x1e, 0xcc, 0xeb, 0x89, 0xdc, 0xd2, 0x6a, 0x99, 0x23, 0xbd, 0x7a,
+  0xbe, 0x8c, 0xe3, 0x3f, 0xa1, 0xe8, 0xf5, 0xb4, 0x51, 0x40, 0xb4, 0xb1,
+  0xc1, 0x16, 0x9f, 0x07, 0xbb, 0x99, 0xaa, 0x4b, 0x8f, 0x11, 0x19, 0x3c,
+  0x18, 0xbd, 0x6e, 0xce, 0x14, 0x54, 0x2c, 0x16, 0x4a, 0x5f, 0x89, 0xe4,
+  0x6b, 0x9f, 0x55, 0x68, 0xcc, 0x09, 0x8e, 0x4b, 0x92, 0xc8, 0x87, 0xfe,
+  0x09, 0xed, 0x53, 0x6e, 0xff, 0x5f, 0x15, 0x0d, 0x19, 0x9d, 0xa6, 0x54,
+  0xd2, 0xea, 0x59, 0x4f, 0xa1, 0x7c, 0xf6, 0xf5, 0x7f, 0x32, 0x23, 0xed,
+  0x72, 0xa8, 0x96, 0x17, 0x87, 0x06, 0xf2, 0xc7, 0xcd, 0xda, 0x4a, 0x10,
+  0xd1, 0xfd, 0xb8, 0xf1, 0xaf, 0x25, 0x55, 0x32, 0x45, 0x39, 0x95, 0xec,
+  0x0c, 0xa9, 0xf0, 0x47, 0x8b, 0x66, 0xe0, 0xb7, 0xa2, 0xf6, 0x35, 0x50,
+  0x27, 0xe7, 0x2f, 0x90, 0x35, 0x5b, 0xd5, 0x62, 0x19, 0xb4, 0x41, 0xd4,
+  0x52, 0xe7, 0x7f, 0x97, 0xfc, 0x5b, 0x4a, 0x5b, 0x19, 0x06, 0x65, 0x2d,
+  0x23, 0x29, 0x15, 0x8b, 0x05, 0xaf, 0xbe, 0xd3, 0x4a, 0x27, 0x5b, 0xc9,
+  0xc0, 0xd0, 0xd2, 0xba, 0x8b, 0x00, 0x7a, 0x2f, 0x39, 0xa0, 0x13, 0xb9,
+  0xe6, 0xf5, 0x4b, 0x21, 0x54, 0x57, 0xb3, 0xf9, 0x6c, 0x6f, 0xd0, 0x17,
+  0xf4, 0x50, 0x9d, 0x00, 0x00, 0x01, 0x00, 0x01, 0xf2, 0xda, 0x5f, 0xfb,
+  0xe2, 0xda, 0xfc, 0xe0, 0xdf, 0x3a, 0x0e, 0x14, 0x18, 0xc1, 0xd9, 0x1f,
+  0x43, 0xe3, 0x65, 0x3e, 0x07, 0xe7, 0x8d, 0xdc, 0x1d, 0x11, 0xc1, 0xd6,
+  0xc0, 0xd8, 0xda, 0x53, 0xf5, 0x04, 0x73, 0x51, 0x1b, 0x26, 0xef, 0x4e,
+  0xf5, 0xce, 0x3d, 0x77, 0x21, 0x94, 0xd0, 0xc7, 0xc1, 0xda, 0x19, 0x7d,
+  0xf8, 0xc5, 0x4c, 0xc8, 0xee, 0x7d, 0xd1, 0xbb, 0x02, 0x90, 0x2b, 0xff,
+  0x4e, 0x4d, 0xd7, 0x9d, 0x72, 0x0c, 0x60, 0x0f, 0x4b, 0x83, 0xf5, 0xc2,
+  0x26, 0xd6, 0x22, 0xb8, 0x60, 0x3a, 0xf9, 0x2f, 0x92, 0x2a, 0x2e, 0x14,
+  0xa7, 0x56, 0x1c, 0x56, 0x05, 0x41, 0x92, 0xac, 0xb1, 0x4e, 0x44, 0x1e,
+  0x70, 0x42, 0xda, 0xc7, 0xc8, 0x9c, 0xae, 0x29, 0x2d, 0x0c, 0x3a, 0xff,
+  0x9b, 0xb6, 0xad, 0xb4, 0xfb, 0x49, 0x28, 0x96, 0x74, 0xf5, 0x94, 0x74,
+  0xb7, 0x40, 0x93, 0x2b, 0x34, 0x29, 0xd2, 0x8a, 0xf3, 0x99, 0xf9, 0xe9,
+  0xd8, 0xcc, 0x48, 0x1d, 0x3e, 0xc1, 0x82, 0x35, 0x4f, 0xef, 0xb1, 0x81,
+  0x3c, 0xe1, 0xa1, 0x03, 0x65, 0xac, 0x21, 0x21, 0x40, 0x61, 0xfb, 0xd3,
+  0x54, 0xac, 0xa1, 0xf2, 0xf0, 0x61, 0xd9, 0x01, 0x4e, 0xc2, 0x28, 0xb1,
+  0x7c, 0x27, 0x6e, 0x56, 0x68, 0x69, 0x8f, 0xc5, 0xfd, 0xca, 0x39, 0x6e,
+  0x22, 0x09, 0xf1, 0xb4, 0xd5, 0xac, 0xb8, 0xe0, 0x1b, 0x21, 0x86, 0xf4,
+  0xc8, 0x15, 0xc6, 0x1f, 0x21, 0xae, 0xcb, 0xab, 0x5a, 0x09, 0x30, 0x9e,
+  0xdd, 0x6c, 0x38, 0x59, 0xec, 0x59, 0x3a, 0x08, 0xee, 0x46, 0x7b, 0x78,
+  0x23, 0xbc, 0xfc, 0xe2, 0xda, 0xe8, 0x1a, 0x65, 0xe6, 0xe0, 0x78, 0xd3,
+  0xb0, 0x03, 0x2e, 0xf1, 0xb8, 0xca, 0x8e, 0x90, 0x75, 0xaf, 0xf7, 0xa8,
+  0x48, 0xed, 0x82, 0xc9, 0xcf, 0x44, 0x56, 0xfc, 0x05, 0xfd, 0x6b, 0x00,
+  0x00, 0x00, 0x81, 0x00, 0xfc, 0x94, 0xdf, 0x42, 0xc7, 0x9a, 0xa2, 0xff,
+  0x32, 0xdf, 0x06, 0xb6, 0x4d, 0x90, 0x31, 0x28, 0x28, 0xdb, 0x03, 0xf9,
+  0xa6, 0xb3, 0xa2, 0x91, 0x4c, 0xdf, 0x6e, 0xf6, 0xb9, 0x44, 0x3b, 0xdd,
+  0x17, 0xc1, 0xc8, 0x1d, 0xd1, 0xc0, 0xc0, 0x30, 0x22, 0xbe, 0x24, 0x2e,
+  0x0e, 0xdf, 0xe0, 0x18, 0x37, 0x3e, 0xb8, 0x7f, 0xb2, 0x50, 0x34, 0xc4,
+  0x08, 0x5e, 0x69, 0x1f, 0xd5, 0xc9, 0xce, 0x47, 0x7d, 0x75, 0x5e, 0x3b,
+  0x87, 0xdd, 0x46, 0x35, 0x01, 0x0f, 0x17, 0x8a, 0xf1, 0xf1, 0xc4, 0xa9,
+  0x94, 0xa7, 0x6e, 0xce, 0x80, 0xe3, 0x17, 0x2e, 0xb0, 0xef, 0x63, 0xa7,
+  0x11, 0x86, 0x96, 0x4a, 0x63, 0x2d, 0x9e, 0x92, 0x62, 0x43, 0x43, 0x72,
+  0xa5, 0xdc, 0xa0, 0xcd, 0x19, 0x93, 0xd7, 0xe0, 0x80, 0x41, 0x27, 0xea,
+  0xe4, 0xe8, 0xc1, 0x91, 0x9e, 0x13, 0xb3, 0x9c, 0xd1, 0xed, 0xcb, 0xbf,
+  0x00, 0x00, 0x00, 0x81, 0x00, 0xb3, 0x6b, 0xee, 0xa4, 0x70, 0x4e, 0xfb,
+  0xf9, 0x7e, 0x2e, 0x74, 0x5d, 0x3e, 0x8b, 0x3f, 0xff, 0x8c, 0xde, 0x68,
+  0x38, 0xda, 0xce, 0xc0, 0x66, 0x4b, 0xca, 0x35, 0xc3, 0x97, 0xa8, 0xf0,
+  0x00, 0x8e, 0xb3, 0x46, 0x60, 0xd0, 0x4d, 0x7e, 0x7b, 0xdf, 0x17, 0x7b,
+  0x2f, 0xc4, 0x16, 0xee, 0x45, 0xdb, 0xa5, 0x5d, 0xc0, 0x72, 0xe9, 0xc6,
+  0x91, 0x0f, 0xd9, 0x30, 0x74, 0x6c, 0xde, 0x93, 0xb5, 0xb6, 0xaf, 0x52,
+  0x53, 0x3c, 0x08, 0x55, 0xea, 0xb8, 0x66, 0x07, 0xbe, 0xce, 0xf9, 0x80,
+  0x8d, 0xe0, 0xca, 0xdc, 0x63, 0xe8, 0x58, 0x94, 0x22, 0x4f, 0x08, 0x66,
+  0x13, 0x9e, 0x63, 0x2e, 0x92, 0x7a, 0xb6, 0x66, 0x94, 0x9b, 0x71, 0x66,
+  0xd3, 0x08, 0xc9, 0x89, 0xea, 0x78, 0x35, 0x0d, 0xf2, 0x25, 0x55, 0xd4,
+  0xb0, 0x9b, 0xea, 0x18, 0x77, 0xf6, 0x25, 0x02, 0xb4, 0x5e, 0x71, 0xea,
+  0xa3
+};
+static unsigned int keyr_len = 805;
+static unsigned char keye[] = {
+  0x00, 0x00, 0x00, 0x13, 0x65, 0x63, 0x64, 0x73, 0x61, 0x2d, 0x73, 0x68,
+  0x61, 0x32, 0x2d, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x32, 0x35, 0x36, 0x00,
+  0x00, 0x00, 0x08, 0x6e, 0x69, 0x73, 0x74, 0x70, 0x32, 0x35, 0x36, 0x00,
+  0x00, 0x00, 0x41, 0x04, 0x0a, 0x00, 0x6c, 0x7c, 0x1c, 0xc4, 0x03, 0x44,
+  0x46, 0x70, 0xba, 0x00, 0x7c, 0x79, 0x89, 0x7b, 0xc3, 0xd6, 0x32, 0x98,
+  0x34, 0xe7, 0x1c, 0x60, 0x04, 0x73, 0xd9, 0xb5, 0x7e, 0x94, 0x04, 0x04,
+  0xea, 0xc8, 0xb8, 0xfb, 0xd4, 0x70, 0x9f, 0x29, 0xa7, 0x8d, 0x9a, 0x64,
+  0x3a, 0x8c, 0x45, 0x23, 0x37, 0x5a, 0x2b, 0x4f, 0x54, 0x91, 0x80, 0xf1,
+  0xac, 0x3a, 0xf5, 0x6d, 0xfa, 0xe8, 0x76, 0x20, 0x00, 0x00, 0x00, 0x21,
+  0x00, 0xc2, 0xaf, 0xbe, 0xdc, 0x06, 0xff, 0x3d, 0x08, 0x9b, 0x73, 0xe0,
+  0x3c, 0x58, 0x28, 0x70, 0x9b, 0x23, 0x39, 0x51, 0xd7, 0xbc, 0xa7, 0x1a,
+  0xf5, 0xb4, 0x23, 0xd3, 0xf6, 0x17, 0xa6, 0x9c, 0x02
+};
+static unsigned int keye_len = 141;
+static unsigned char keyd[] = {
+  0x00, 0x00, 0x00, 0x07, 0x73, 0x73, 0x68, 0x2d, 0x64, 0x73, 0x73, 0x00,
+  0x00, 0x00, 0x81, 0x00, 0xb0, 0x02, 0x19, 0x8b, 0xf3, 0x46, 0xf9, 0xc5,
+  0x47, 0x78, 0x3d, 0x7f, 0x04, 0x10, 0x0a, 0x43, 0x8e, 0x00, 0x9e, 0xa4,
+  0x30, 0xfd, 0x47, 0xb9, 0x05, 0x9e, 0x95, 0xaa, 0x37, 0x9a, 0x91, 0xbf,
+  0xf8, 0xb9, 0xe0, 0x8d, 0x97, 0x49, 0x87, 0xe2, 0xe6, 0x90, 0xc1, 0xe4,
+  0x61, 0x57, 0x77, 0xfd, 0x91, 0x1d, 0xe1, 0x4b, 0xa0, 0xb2, 0xbc, 0xa1,
+  0x6a, 0x6a, 0xdd, 0x31, 0xda, 0xe7, 0x54, 0x03, 0xfd, 0x48, 0x62, 0x8a,
+  0x1d, 0x1d, 0xe2, 0x26, 0x76, 0x29, 0x08, 0xab, 0x65, 0x88, 0x74, 0x02,
+  0x1e, 0xa9, 0x29, 0x1b, 0x69, 0x3b, 0xb4, 0x5f, 0x62, 0x80, 0xa3, 0xa6,
+  0x4b, 0xc3, 0x0e, 0x89, 0x24, 0xe4, 0x8a, 0x31, 0xae, 0x89, 0x7a, 0x7a,
+  0x58, 0x44, 0x46, 0x77, 0x62, 0x33, 0xa2, 0x5d, 0x17, 0x0e, 0x0b, 0x64,
+  0xee, 0x1a, 0x02, 0xbd, 0xf8, 0x27, 0x86, 0xe1, 0x87, 0x92, 0x84, 0xc7,
+  0x00, 0x00, 0x00, 0x15, 0x00, 0xb3, 0x8b, 0x81, 0x39, 0x9c, 0xba, 0xe1,
+  0x1d, 0x9a, 0x8b, 0x89, 0xb3, 0x08, 0x9b, 0x12, 0xa8, 0x7b, 0xea, 0x25,
+  0x8d, 0x00, 0x00, 0x00, 0x80, 0x76, 0x3f, 0x72, 0xb2, 0xef, 0xc3, 0x16,
+  0xd8, 0x09, 0x36, 0x23, 0x03, 0xf9, 0x5c, 0xac, 0x8b, 0x51, 0x35, 0x2e,
+  0x36, 0xba, 0x39, 0xd0, 0x57, 0x19, 0x4f, 0x14, 0x8b, 0xea, 0x32, 0xfc,
+  0x86, 0x41, 0xea, 0x85, 0x71, 0x4d, 0x52, 0x0c, 0xff, 0xc1, 0xd3, 0xd5,
+  0xcd, 0x2e, 0x37, 0xcc, 0xe1, 0xcc, 0x22, 0x38, 0xa8, 0x47, 0x16, 0x34,
+  0x3b, 0x32, 0x9c, 0x2f, 0x0f, 0xcd, 0x5f, 0x7f, 0x06, 0x64, 0x89, 0xc5,
+  0x02, 0x4f, 0x9a, 0x70, 0x11, 0xf0, 0xaa, 0xe1, 0x7a, 0x75, 0x49, 0x8d,
+  0x0f, 0x8d, 0x5b, 0x54, 0xe2, 0xe7, 0x10, 0x6e, 0xe5, 0xbd, 0xb7, 0x62,
+  0xf7, 0x40, 0x59, 0x39, 0x31, 0xd9, 0x13, 0x7b, 0xa3, 0xdf, 0x0d, 0x31,
+  0x52, 0x43, 0xe0, 0xaf, 0x19, 0x12, 0x15, 0x12, 0x34, 0x01, 0x6f, 0xcf,
+  0x62, 0x21, 0xe4, 0xc8, 0x34, 0x69, 0xc9, 0x85, 0xe3, 0xde, 0xd7, 0x0c,
+  0xac, 0x00, 0x00, 0x00, 0x80, 0x41, 0xa3, 0xc5, 0xa4, 0x89, 0x86, 0xc8,
+  0x17, 0xf3, 0x8e, 0x68, 0x72, 0xbe, 0x13, 0x8b, 0x63, 0xe3, 0x07, 0xe3,
+  0xd5, 0xa4, 0xa2, 0xd3, 0x2c, 0x2f, 0xbe, 0x16, 0x71, 0xc9, 0x79, 0x64,
+  0x5a, 0x1e, 0x19, 0x82, 0x07, 0xe2, 0x93, 0xda, 0x22, 0xcf, 0x6d, 0xdd,
+  0x38, 0xcb, 0x6e, 0x6b, 0x0f, 0x95, 0x8d, 0xfa, 0x3f, 0xbb, 0xb8, 0x6a,
+  0x7d, 0xc3, 0x22, 0x1e, 0x49, 0xcf, 0x98, 0x73, 0x05, 0x5d, 0x97, 0xfa,
+  0x4c, 0xf2, 0x82, 0x3d, 0x98, 0x61, 0x4e, 0x96, 0x80, 0x26, 0x79, 0xda,
+  0x24, 0xf8, 0xa1, 0x9c, 0x71, 0x82, 0xe6, 0xc7, 0xdc, 0xc2, 0xa5, 0xd0,
+  0xf4, 0x36, 0xba, 0xaa, 0xee, 0xd3, 0x43, 0x46, 0x1d, 0xaa, 0x53, 0xea,
+  0x85, 0x2c, 0x1b, 0xc8, 0x7c, 0x3c, 0xe7, 0x06, 0x44, 0xab, 0x16, 0xad,
+  0xc6, 0x54, 0x91, 0x9a, 0xb9, 0xc0, 0xeb, 0x93, 0x8c, 0xca, 0x39, 0xcf,
+  0x6f, 0x00, 0x00, 0x00, 0x15, 0x00, 0x90, 0x26, 0x0a, 0xfc, 0x15, 0x99,
+  0x7b, 0xac, 0xaa, 0x0c, 0xa2, 0xca, 0x7b, 0xa8, 0xd4, 0xdf, 0x68, 0x56,
+  0xf9, 0x39
+};
+static unsigned int keyd_len = 458;
+static unsigned char keyed25519[] = {
+  0x00, 0x00, 0x00, 0x0b, 0x73, 0x73, 0x68, 0x2d, 0x65, 0x64, 0x32, 0x35,
+  0x35, 0x31, 0x39, 0x00, 0x00, 0x00, 0x40, 0x10, 0xb3, 0x79, 0x06, 0xe5,
+  0x9b, 0xe7, 0xe4, 0x6e, 0xec, 0xfe, 0xa5, 0x39, 0x21, 0x7c, 0xf6, 0x66,
+  0x8c, 0x0b, 0x6a, 0x01, 0x09, 0x05, 0xc7, 0x4f, 0x64, 0xa8, 0x24, 0xd2,
+  0x8d, 0xbd, 0xdd, 0xc6, 0x3c, 0x99, 0x1b, 0x2d, 0x3e, 0x33, 0x90, 0x19,
+  0xa4, 0xd5, 0xe9, 0x23, 0xfe, 0x8e, 0xd6, 0xd4, 0xf9, 0xb1, 0x11, 0x69,
+  0x7c, 0x57, 0x52, 0x0e, 0x41, 0xdb, 0x1b, 0x12, 0x87, 0xfa, 0xc9
+};
+static unsigned int keyed25519_len = 83;

fuzz/fuzz-sshpacketmutator.c

@@ -0,0 +1,306 @@
+/* A mutator/crossover for SSH protocol streams.
+   Attempts to mutate each SSH packet individually, keeping
+   lengths intact.
+   It will prepend a SSH-2.0-dbfuzz\r\n version string.
+
+   Linking this file to a binary will make libfuzzer pick up the custom mutator.
+
+   Care is taken to avoid memory allocation which would otherwise
+   slow exec/s substantially */
+
+#include "fuzz.h"
+#include "dbutil.h"
+
+size_t LLVMFuzzerMutate(uint8_t *Data, size_t Size, size_t MaxSize);
+
+static const char* FIXED_VERSION = "SSH-2.0-dbfuzz\r\n";
+static const char* FIXED_IGNORE_MSG = 
+        "\x00\x00\x00\x10\x06\x02\x00\x00\x00\x00\x11\x22\x33\x44\x55\x66";
+static const unsigned int FIXED_IGNORE_MSG_LEN = 16;
+#define MAX_FUZZ_PACKETS 500
+/* XXX This might need tuning */
+static const size_t MAX_OUT_SIZE = 50000;
+
+/* Splits packets from an input stream buffer "inp".
+The initial SSH version identifier is discarded.
+If packets are not recognised it will increment until an uint32 of valid
+packet length is found. */
+
+/* out_packets an array of num_out_packets*buffer, each of size RECV_MAX_PACKET_LEN */
+static void fuzz_get_packets(buffer *inp, buffer **out_packets, unsigned int *num_out_packets) {
+    /* Skip any existing banner. Format is
+          SSH-protoversion-softwareversion SP comments CR LF
+    so we look for SSH-2. then a subsequent LF */
+    unsigned char* version = memmem(inp->data, inp->len, "SSH-2.", strlen("SSH-2."));
+    if (version) {
+        buf_incrpos(inp, version - inp->data);
+        unsigned char* newline = memchr(&inp->data[inp->pos], '\n', inp->len - inp->pos);
+        if (newline) {
+            buf_incrpos(inp, newline - &inp->data[inp->pos]+1);
+        } else {
+            /* Give up on any version string */
+            buf_setpos(inp, 0);
+        }
+    }
+
+    const unsigned int max_out_packets = *num_out_packets;
+    *num_out_packets = 0;
+    while (1) {
+        if (inp->pos + 4 > inp->len) {
+            /* End of input */
+            break;
+        }
+
+        if (*num_out_packets >= max_out_packets) {
+            /* End of output */
+            break;
+        }
+
+        /* Read packet */
+        unsigned int packet_len = buf_getint(inp);
+        if (packet_len > RECV_MAX_PACKET_LEN-4) {
+            /* Bad length, try skipping a single byte */
+            buf_decrpos(inp, 3);
+            continue;
+        }
+        packet_len = MIN(packet_len, inp->len - inp->pos);
+
+        /* Check the packet length makes sense */
+        if (packet_len >= MIN_PACKET_LEN-4) {
+            /* Copy to output buffer. We're reusing buffers */
+            buffer* new_packet = out_packets[*num_out_packets];
+            (*num_out_packets)++;
+            buf_setlen(new_packet, 0);
+            // packet_len doesn't include itself
+            buf_putint(new_packet, packet_len);
+            buf_putbytes(new_packet, buf_getptr(inp, packet_len), packet_len);
+        }
+        buf_incrpos(inp, packet_len);
+    }
+}
+
+/* Mutate a packet buffer in-place.
+Returns DROPBEAR_FAILURE if it's too short */
+static int buf_llvm_mutate(buffer *buf) {
+    int ret;
+    /* Position it after packet_length and padding_length */
+    const unsigned int offset = 5;
+    buf_setpos(buf, 0);
+    buf_incrwritepos(buf, offset);
+    size_t max_size = buf->size - buf->pos;
+    size_t new_size = LLVMFuzzerMutate(buf_getwriteptr(buf, max_size),
+        buf->len - buf->pos, max_size);
+    size_t new_total = new_size + 1 + 4;
+    // Round down to a block size
+    new_total = new_total - (new_total % dropbear_nocipher.blocksize);
+
+    if (new_total >= 16) {
+        buf_setlen(buf, new_total);
+        // Fix up the length fields
+        buf_setpos(buf, 0);
+        // packet_length doesn't include itself, does include padding_length byte
+        buf_putint(buf, new_size+1);
+        // always just put minimum padding length = 4
+        buf_putbyte(buf, 4);
+        ret = DROPBEAR_SUCCESS;
+    } else {
+        // instead put a fake packet
+        buf_setlen(buf, 0);
+        buf_putbytes(buf, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
+        ret = DROPBEAR_FAILURE;
+    }
+    return ret;
+}
+
+
+/* Persistent buffers to avoid constant allocations */
+static buffer *oup;
+static buffer *alloc_packetA;
+static buffer *alloc_packetB;
+static buffer* packets1[MAX_FUZZ_PACKETS];
+static buffer* packets2[MAX_FUZZ_PACKETS];
+
+/* Allocate buffers once at startup.
+   'constructor' here so it runs before dbmalloc's interceptor */
+static void alloc_static_buffers() __attribute__((constructor));
+static void alloc_static_buffers() {
+
+    int i;
+    oup = buf_new(MAX_OUT_SIZE);
+    alloc_packetA = buf_new(RECV_MAX_PACKET_LEN);
+    alloc_packetB = buf_new(RECV_MAX_PACKET_LEN);
+
+    for (i = 0; i < MAX_FUZZ_PACKETS; i++) {
+        packets1[i] = buf_new(RECV_MAX_PACKET_LEN);
+    }
+    for (i = 0; i < MAX_FUZZ_PACKETS; i++) {
+        packets2[i] = buf_new(RECV_MAX_PACKET_LEN);
+    }
+}
+
+size_t LLVMFuzzerCustomMutator(uint8_t *Data, size_t Size,
+              size_t MaxSize, unsigned int Seed) {
+
+    buf_setlen(alloc_packetA, 0);
+    buf_setlen(alloc_packetB, 0);
+    buf_setlen(oup, 0);
+
+    unsigned int i;
+    size_t ret_len;
+    unsigned short randstate[3] = {0,0,0};
+    memcpy(randstate, &Seed, sizeof(Seed));
+
+    // printhex("mutator input", Data, Size);
+
+    /* 0.1% chance straight llvm mutate */
+    // if (nrand48(randstate) % 1000 == 0) {
+    //     ret_len = LLVMFuzzerMutate(Data, Size, MaxSize);
+    //     // printhex("mutator straight llvm", Data, ret_len);
+    //     return ret_len;
+    // }
+
+    buffer inp_buf = {.data = Data, .size = Size, .len = Size, .pos = 0};
+    buffer *inp = &inp_buf;
+
+    /* Parse packets */
+    unsigned int num_packets = MAX_FUZZ_PACKETS;
+    buffer **packets = packets1;
+    fuzz_get_packets(inp, packets, &num_packets);
+
+    if (num_packets == 0) {
+        // Make up a packet, writing direct to the buffer
+        inp->size = MaxSize;
+        buf_setlen(inp, 0);
+        buf_putbytes(inp, FIXED_VERSION, strlen(FIXED_VERSION));
+        buf_putbytes(inp, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
+        // printhex("mutator no input", Data, inp->len);
+        return inp->len;
+    }
+
+    /* Start output */
+    /* Put a new banner to output */
+    buf_putbytes(oup, FIXED_VERSION, strlen(FIXED_VERSION));
+
+    /* Iterate output */
+    for (i = 0; i < num_packets+1; i++) {
+        // These are pointers to output
+        buffer *out_packetA = NULL, *out_packetB = NULL;
+        buf_setlen(alloc_packetA, 0);
+        buf_setlen(alloc_packetB, 0);
+
+        /* 2% chance each */
+        const int optA = nrand48(randstate) % 50;
+        if (optA == 0) {
+            /* Copy another */
+            unsigned int other = nrand48(randstate) % num_packets;
+            out_packetA = packets[other];
+            // printf("copy another %d / %d len %u\n", other, num_packets, out_packetA->len);
+        }
+        if (optA == 1) {
+            /* Mutate another */
+            unsigned int other = nrand48(randstate) % num_packets;
+            out_packetA = alloc_packetA;
+            buffer *from = packets[other];
+            buf_putbytes(out_packetA, from->data, from->len);
+            if (buf_llvm_mutate(out_packetA) == DROPBEAR_FAILURE) {
+                out_packetA = NULL;
+            }
+            // printf("mutate another %d / %d len %u -> %u\n", other, num_packets, from->len, out_packetA->len);
+        }
+
+        if (i < num_packets) {
+            int optB = nrand48(randstate) % 100;
+            if (optB == 1) {
+                /* small chance of drop */
+                /* Drop it */
+                //printf("%d drop\n", i);
+            } else { 
+                /* Odds of modification are proportional to packet position.
+                First packet has 20% chance, last has 100% chance */
+                int optC = nrand48(randstate) % 1000;
+                int mutate_cutoff = MAX(200, (1000 * (i+1) / num_packets));
+                if (optC < mutate_cutoff) {
+                    // // printf("%d mutate\n", i);
+                    out_packetB = alloc_packetB;
+                    buffer *from = packets[i];
+                    buf_putbytes(out_packetB, from->data, from->len);
+                    if (buf_llvm_mutate(out_packetB) == DROPBEAR_FAILURE) {
+                        out_packetB = from;
+                    }
+                    // printf("mutate self %d / %d len %u -> %u\n", i, num_packets, from->len, out_packetB->len);
+                } else {
+                    /* Copy as-is */
+                    out_packetB = packets[i];
+                    // printf("%d as-is len %u\n", i, out_packetB->len);
+                } 
+            }
+        }
+
+        if (out_packetA && oup->len + out_packetA->len <= oup->size) {
+            buf_putbytes(oup, out_packetA->data, out_packetA->len);
+        }
+        if (out_packetB && oup->len + out_packetB->len <= oup->size) {
+            buf_putbytes(oup, out_packetB->data, out_packetB->len);
+        }
+    }
+
+    ret_len = MIN(MaxSize, oup->len);
+    memcpy(Data, oup->data, ret_len);
+    // printhex("mutator done", Data, ret_len);
+    return ret_len;
+}
+
+size_t LLVMFuzzerCustomCrossOver(const uint8_t *Data1, size_t Size1,
+                                            const uint8_t *Data2, size_t Size2,
+                                            uint8_t *Out, size_t MaxOutSize,
+                                            unsigned int Seed) {
+    unsigned short randstate[3] = {0,0,0};
+    memcpy(randstate, &Seed, sizeof(Seed));
+
+    unsigned int i;
+    buffer inp_buf1 = {.data = (void*)Data1, .size = Size1, .len = Size1, .pos = 0};
+    buffer *inp1 = &inp_buf1;
+    buffer inp_buf2 = {.data = (void*)Data2, .size = Size2, .len = Size2, .pos = 0};
+    buffer *inp2 = &inp_buf2;
+
+    unsigned int num_packets1 = MAX_FUZZ_PACKETS;
+    fuzz_get_packets(inp1, packets1, &num_packets1);
+    unsigned int num_packets2 = MAX_FUZZ_PACKETS;
+    fuzz_get_packets(inp2, packets2, &num_packets2);
+
+    // fprintf(stderr, "input 1 %u packets\n", num_packets1);
+    // printhex("crossover input1", Data1, Size1);
+    // fprintf(stderr, "input 2 %u packets\n", num_packets2);
+    // printhex("crossover input2", Data2, Size2);
+
+    buf_setlen(oup, 0);
+    /* Put a new banner to output */
+    buf_putbytes(oup, FIXED_VERSION, strlen(FIXED_VERSION));
+
+    if (num_packets1 == 0 && num_packets2 == 0) {
+        buf_putbytes(oup, FIXED_IGNORE_MSG, FIXED_IGNORE_MSG_LEN);
+    } else {
+        unsigned int min_out = MIN(num_packets1, num_packets2);
+        unsigned int max_out = num_packets1 + num_packets2;
+        unsigned int num_out = min_out + nrand48(randstate) % (max_out-min_out+1);
+
+        for (i = 0; i < num_out; i++) {
+            unsigned int choose = nrand48(randstate) % (num_packets1 + num_packets2);
+            buffer *p = NULL;
+            if (choose < num_packets1) {
+                p = packets1[choose];
+            } else {
+                p = packets2[choose-num_packets1];
+            }
+            if (oup->len + p->len <= oup->size) {
+                buf_putbytes(oup, p->data, p->len);
+            }
+        }
+    }
+
+    size_t ret_len = MIN(MaxOutSize, oup->len);
+    memcpy(Out, oup->data, ret_len);
+    // printhex("crossover output", Out, ret_len);
+    return ret_len;
+}
+

fuzz/fuzz-wrapfd.c

@@ -0,0 +1,279 @@
+#define FUZZ_SKIP_WRAP 1
+#include "includes.h"
+#include "fuzz-wrapfd.h"
+
+#include "dbutil.h"
+
+#include "fuzz.h"
+
+#define IOWRAP_MAXFD (FD_SETSIZE-1)
+static const int MAX_RANDOM_IN = 50000;
+static const double CHANCE_CLOSE = 1.0 / 600;
+static const double CHANCE_INTR = 1.0 / 900;
+static const double CHANCE_READ1 = 0.96;
+static const double CHANCE_READ2 = 0.5;
+static const double CHANCE_WRITE1 = 0.96;
+static const double CHANCE_WRITE2 = 0.5;
+
+struct fdwrap {
+	enum wrapfd_mode mode;
+	int closein;
+	int closeout;
+};
+
+static struct fdwrap wrap_fds[IOWRAP_MAXFD+1] = {{UNUSED, 0, 0}};
+static int wrapfd_maxfd = -1;
+static unsigned short rand_state[3];
+static buffer *input_buf;
+static int devnull_fd = -1;
+
+static void wrapfd_remove(int fd);
+
+void wrapfd_setup(buffer *buf) {
+	TRACE(("wrapfd_setup"))
+
+	// clean old ones
+	int i;
+	for (i = 0; i <= wrapfd_maxfd; i++) {
+		if (wrap_fds[i].mode != UNUSED) {
+			wrapfd_remove(i);
+		}
+	}
+	wrapfd_maxfd = -1;
+
+	memset(rand_state, 0x0, sizeof(rand_state));
+	wrapfd_setseed(50);
+	input_buf = buf;
+}
+
+void wrapfd_setseed(uint32_t seed) {
+	memcpy(rand_state, &seed, sizeof(seed));
+	nrand48(rand_state);
+}
+
+int wrapfd_new_fuzzinput() {
+	if (devnull_fd == -1) {
+		devnull_fd = open("/dev/null", O_RDONLY);
+		assert(devnull_fd != -1);
+	}
+
+	int fd = dup(devnull_fd);
+	assert(fd != -1);
+	assert(wrap_fds[fd].mode == UNUSED);
+	wrap_fds[fd].mode = COMMONBUF;
+	wrap_fds[fd].closein = 0;
+	wrap_fds[fd].closeout = 0;
+	wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
+
+	return fd;
+}
+
+int wrapfd_new_dummy() {
+	if (devnull_fd == -1) {
+		devnull_fd = open("/dev/null", O_RDONLY);
+		assert(devnull_fd != -1);
+	}
+
+	int fd = dup(devnull_fd);
+	if (fd == -1) {
+		return -1;
+	}
+	if (fd > IOWRAP_MAXFD) {
+		close(fd);
+		errno = EMFILE;
+		return -1;
+	}
+	assert(wrap_fds[fd].mode == UNUSED);
+	wrap_fds[fd].mode = DUMMY;
+	wrap_fds[fd].closein = 0;
+	wrap_fds[fd].closeout = 0;
+	wrapfd_maxfd = MAX(fd, wrapfd_maxfd);
+
+	return fd;
+}
+
+
+static void wrapfd_remove(int fd) {
+	TRACE(("wrapfd_remove %d", fd))
+	assert(fd >= 0);
+	assert(fd <= IOWRAP_MAXFD);
+	assert(wrap_fds[fd].mode != UNUSED);
+	wrap_fds[fd].mode = UNUSED;
+	close(fd);
+}
+
+int wrapfd_close(int fd) {
+	if (fd >= 0 && fd <= IOWRAP_MAXFD && wrap_fds[fd].mode != UNUSED) {
+		wrapfd_remove(fd);
+		return 0;
+	} else {
+		return close(fd);
+	}
+}
+
+int wrapfd_read(int fd, void *out, size_t count) {
+	size_t maxread;
+
+	if (!fuzz.wrapfds) {
+		return read(fd, out, count);
+	}
+
+	if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
+		/* XXX - assertion failure? */
+		TRACE(("Bad read descriptor %d\n", fd))
+		errno = EBADF;
+		return -1;
+	}
+
+	assert(count != 0);
+
+	if (wrap_fds[fd].closein || erand48(rand_state) < CHANCE_CLOSE) {
+		wrap_fds[fd].closein = 1;
+		errno = ECONNRESET;
+		return -1;
+	}
+
+	if (erand48(rand_state) < CHANCE_INTR) {
+		errno = EINTR;
+		return -1;
+	}
+
+	if (input_buf && wrap_fds[fd].mode == COMMONBUF) {
+		maxread = MIN(input_buf->len - input_buf->pos, count);
+		/* returns 0 if buf is EOF, as intended */
+		if (maxread > 0) {
+			maxread = nrand48(rand_state) % maxread + 1;
+		}
+		memcpy(out, buf_getptr(input_buf, maxread), maxread);
+		buf_incrpos(input_buf, maxread);
+		return maxread;
+	}
+
+	// return fixed output, of random length
+	maxread = MIN(MAX_RANDOM_IN, count);
+	maxread = nrand48(rand_state) % maxread + 1;
+	memset(out, 0xef, maxread);
+	return maxread;
+}
+
+int wrapfd_write(int fd, const void* in, size_t count) {
+	unsigned const volatile char* volin = in;
+	unsigned int i;
+
+	if (!fuzz.wrapfds) {
+		return write(fd, in, count);
+	}
+
+	if (fd < 0 || fd > IOWRAP_MAXFD || wrap_fds[fd].mode == UNUSED) {
+		/* XXX - assertion failure? */
+		TRACE(("Bad read descriptor %d\n", fd))
+		errno = EBADF;
+		return -1;
+	}
+
+	assert(count != 0);
+
+	/* force read to exercise sanitisers */
+	for (i = 0; i < count; i++) {
+		(void)volin[i];
+	}
+
+	if (wrap_fds[fd].closeout || erand48(rand_state) < CHANCE_CLOSE) {
+		wrap_fds[fd].closeout = 1;
+		errno = ECONNRESET;
+		return -1;
+	}
+
+	if (erand48(rand_state) < CHANCE_INTR) {
+		errno = EINTR;
+		return -1;
+	}
+
+	return nrand48(rand_state) % (count+1);
+}
+
+int wrapfd_select(int nfds, fd_set *readfds, fd_set *writefds, 
+	fd_set *exceptfds, struct timeval *timeout) {
+	int i, nset, sel;
+	int ret = 0;
+	int fdlist[IOWRAP_MAXFD+1];
+
+	if (!fuzz.wrapfds) {
+		return select(nfds, readfds, writefds, exceptfds, timeout);
+	}
+
+	assert(nfds <= IOWRAP_MAXFD+1);
+
+	if (erand48(rand_state) < CHANCE_INTR) {
+		errno = EINTR;
+		return -1;
+	}
+
+	/* read */
+	if (readfds != NULL && erand48(rand_state) < CHANCE_READ1) {
+		for (i = 0, nset = 0; i < nfds; i++) {
+			if (FD_ISSET(i, readfds)) {
+				assert(wrap_fds[i].mode != UNUSED);
+				fdlist[nset] = i;
+				nset++;
+			}
+		}
+		DROPBEAR_FD_ZERO(readfds);
+
+		if (nset > 0) {
+			/* set one */
+			sel = fdlist[nrand48(rand_state) % nset];
+			FD_SET(sel, readfds);
+			ret++;
+
+			if (erand48(rand_state) < CHANCE_READ2) {
+				sel = fdlist[nrand48(rand_state) % nset];
+				if (!FD_ISSET(sel, readfds)) {
+					FD_SET(sel, readfds);
+					ret++;
+				}
+			}
+		}
+	}
+
+	/* write */
+	if (writefds != NULL && erand48(rand_state) < CHANCE_WRITE1) {
+		for (i = 0, nset = 0; i < nfds; i++) {
+			if (FD_ISSET(i, writefds)) {
+				assert(wrap_fds[i].mode != UNUSED);
+				fdlist[nset] = i;
+				nset++;
+			}
+		}
+		DROPBEAR_FD_ZERO(writefds);
+
+		/* set one */
+		if (nset > 0) {
+			sel = fdlist[nrand48(rand_state) % nset];
+			FD_SET(sel, writefds);
+			ret++;
+
+			if (erand48(rand_state) < CHANCE_WRITE2) {
+				sel = fdlist[nrand48(rand_state) % nset];
+				if (!FD_ISSET(sel, writefds)) {
+					FD_SET(sel, writefds);
+					ret++;
+				}
+			}
+		}
+	}
+	return ret;
+}
+
+int fuzz_kill(pid_t pid, int sig) {
+	if (fuzz.fuzzing) {
+		TRACE(("fuzz_kill ignoring pid %d signal %d", (pid), sig))
+		if (sig >= 0) {
+			return 0;
+		} else {
+			errno = EINVAL;
+			return -1;
+		}
+	}
+	return kill(pid, sig);
+}

fuzz/fuzzer-cliconf.c

@@ -0,0 +1,79 @@
+/* fuzz target for cli-readconf.c */
+
+#include "fuzz.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+#include "runopts.h"
+
+static void setup_fuzzer(void) {
+	fuzz_common_setup();
+	/* Set up commandline args */
+	char* args[2] = { "dbclient", "far" };
+	cli_getopts(2, args);
+}
+
+// Needs to be outside so it doesn't get optimised away for the setjmp().
+// volatile doesn't seem to work, unsure why.
+static FILE *conf_file = NULL;
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	static int once = 0;
+	if (!once) {
+		setup_fuzzer();
+		once = 1;
+	}
+
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+
+		/* remotehost most be set before config parsing */
+		m_free(cli_opts.remotehost);
+		cli_opts.remotehost = m_strdup("far");
+		/* optional arguments */
+		if (buf_getbool(fuzz.input)) {
+			m_free(cli_opts.username);
+			cli_opts.username = m_strdup("someone");
+		}
+		if (buf_getbool(fuzz.input)) {
+			m_free(cli_opts.remoteport);
+			cli_opts.remoteport = m_strdup("999");
+		}
+
+		buffer *conf_buf = buf_getstringbuf(fuzz.input);
+		if (conf_buf->len > 0)
+		{
+			conf_file = fmemopen(conf_buf->data, conf_buf->len, "r");
+			read_config_file("fuzz", conf_file, &cli_opts);
+			fclose(conf_file);
+			conf_file = NULL;
+		}
+		buf_free(conf_buf);
+
+		m_free(cli_opts.remotehost);
+		m_free(cli_opts.remoteport);
+		m_free(cli_opts.username);
+
+		m_malloc_free_epoch(1, 0);
+	} else {
+		// Cleanup
+		if (conf_file) {
+			fclose(conf_file);
+			conf_file = NULL;
+		}
+
+		m_free(cli_opts.remotehost);
+		m_free(cli_opts.remoteport);
+		m_free(cli_opts.username);
+
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzz/fuzzer-client.c

@@ -0,0 +1,6 @@
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	return fuzz_run_client(Data, Size, 0);
+}
+

fuzz/fuzzer-client_nomaths.c

@@ -0,0 +1,6 @@
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	return fuzz_run_client(Data, Size, 1);
+}
+

fuzz/fuzzer-kexcurve25519.c

@@ -0,0 +1,69 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+#include "runopts.h"
+#include "algo.h"
+#include "bignum.h"
+
+static struct key_context* keep_newkeys = NULL;
+/* An arbitrary limit */
+#define NUM_PARAMS 80
+static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
+
+static void setup() __attribute__((constructor));
+// Perform initial setup here to avoid hitting timeouts on first run
+static void setup() {
+	fuzz_common_setup();
+	fuzz_svr_setup();
+
+	keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
+	keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
+	keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
+	ses.newkeys = keep_newkeys;
+
+	/* Pre-generate parameters */
+	int i;
+	for (i = 0; i < NUM_PARAMS; i++) {
+		curve25519_params[i] = gen_kexcurve25519_param();
+	}
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		/* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply() 
+		with DROPBEAR_KEX_CURVE25519 */
+		ses.newkeys = keep_newkeys;
+
+		/* Choose from the collection of curve25519 params */
+		unsigned int e = buf_getint(fuzz.input);
+		struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
+
+		buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
+
+		ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
+		kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
+
+		mp_clear(ses.dh_K);
+		m_free(ses.dh_K);
+		buf_free(ecdh_qs);
+
+		buf_free(ses.hash);
+		buf_free(ses.session_id);
+		/* kexhashbuf is freed in kexdh_comb_key */
+
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzz/fuzzer-kexdh.c

@@ -0,0 +1,72 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+#include "runopts.h"
+#include "algo.h"
+#include "bignum.h"
+
+static struct key_context* keep_newkeys = NULL;
+#define NUM_PARAMS 80
+static struct kex_dh_param *dh_params[NUM_PARAMS];
+
+static void setup() __attribute__((constructor));
+// Perform initial setup here to avoid hitting timeouts on first run
+static void setup() {
+	fuzz_common_setup();
+	fuzz_svr_setup();
+
+	keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
+	keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "diffie-hellman-group14-sha256");
+	keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
+	ses.newkeys = keep_newkeys;
+
+	/* Pre-generate parameters */
+	int i;
+	for (i = 0; i < NUM_PARAMS; i++) {
+		dh_params[i] = gen_kexdh_param();
+	}
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		/* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply() 
+		with DROPBEAR_KEX_NORMAL_DH */
+		ses.newkeys = keep_newkeys;
+
+		/* Choose from the collection of ecdh params */
+		unsigned int e = buf_getint(fuzz.input);
+		struct kex_dh_param * dh_param = dh_params[e % NUM_PARAMS];
+
+		DEF_MP_INT(dh_e);
+		m_mp_init(&dh_e);
+		if (buf_getmpint(fuzz.input, &dh_e) != DROPBEAR_SUCCESS) {
+			dropbear_exit("Bad kex value");
+		}
+
+		ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
+		kexdh_comb_key(dh_param, &dh_e, svr_opts.hostkey);
+
+		mp_clear(ses.dh_K);
+		m_free(ses.dh_K);
+		mp_clear(&dh_e);
+
+		buf_free(ses.hash);
+		buf_free(ses.session_id);
+		/* kexhashbuf is freed in kexdh_comb_key */
+
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzz/fuzzer-kexecdh.c

@@ -0,0 +1,82 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+#include "runopts.h"
+#include "algo.h"
+#include "bignum.h"
+
+static const struct dropbear_kex *ecdh[3]; /* 256, 384, 521 */
+static struct key_context* keep_newkeys = NULL;
+/* number of generated parameters. An arbitrary limit, but will delay startup */
+#define NUM_PARAMS 80
+static struct kex_ecdh_param *ecdh_params[NUM_PARAMS];
+
+static void setup() __attribute__((constructor));
+// Perform initial setup here to avoid hitting timeouts on first run
+static void setup() {
+	fuzz_common_setup();
+	fuzz_svr_setup();
+
+	/* ses gets zeroed by fuzz_set_input */
+	keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
+	ecdh[0] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp256");
+	ecdh[1] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp384");
+	ecdh[2] = fuzz_get_algo(sshkex, "ecdh-sha2-nistp521");
+	assert(ecdh[0]);
+	assert(ecdh[1]);
+	assert(ecdh[2]);
+	keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ECDSA_NISTP256;
+	ses.newkeys = keep_newkeys;
+
+	/* Pre-generate parameters */
+	int i;
+	for (i = 0; i < NUM_PARAMS; i++) {
+		ses.newkeys->algo_kex = ecdh[i % 3];
+		ecdh_params[i] = gen_kexecdh_param();
+	}
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		/* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply() 
+		with DROPBEAR_KEX_ECDH */
+		ses.newkeys = keep_newkeys;
+
+		/* random choice of ecdh 256, 384, 521 */
+		unsigned char b = buf_getbyte(fuzz.input);
+		ses.newkeys->algo_kex = ecdh[b % 3];
+
+		/* Choose from the collection of ecdh params */
+		unsigned int e = buf_getint(fuzz.input);
+		struct kex_ecdh_param *ecdh_param = ecdh_params[e % NUM_PARAMS];
+
+		buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
+
+		ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
+		kexecdh_comb_key(ecdh_param, ecdh_qs, svr_opts.hostkey);
+
+		mp_clear(ses.dh_K);
+		m_free(ses.dh_K);
+		buf_free(ecdh_qs);
+
+		buf_free(ses.hash);
+		buf_free(ses.session_id);
+		/* kexhashbuf is freed in kexdh_comb_key */
+
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzz/fuzzer-postauth_nomaths.c

@@ -0,0 +1,6 @@
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	return fuzz_run_server(Data, Size, 1, 1);
+}
+

fuzz/fuzzer-preauth.c

@@ -0,0 +1,6 @@
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	return fuzz_run_server(Data, Size, 0, 0);
+}
+

fuzz/fuzzer-preauth_nomaths.c

@@ -0,0 +1,6 @@
+#include "fuzz.h"
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	return fuzz_run_server(Data, Size, 1, 0);
+}
+

fuzz/fuzzer-pubkey.c

@@ -0,0 +1,54 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+
+static void setup_fuzzer(void) {
+	fuzz_common_setup();
+}
+
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	static int once = 0;
+	if (!once) {
+		setup_fuzzer();
+		once = 1;
+	}
+
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		buffer *line = buf_getstringbuf(fuzz.input);
+		buffer *keyblob = buf_getstringbuf(fuzz.input);
+
+		unsigned int algolen;
+		char* algoname = buf_getstring(keyblob, &algolen);
+
+		if (signature_type_from_name(algoname, algolen) == DROPBEAR_SIGNATURE_NONE) {
+			dropbear_exit("fuzzer imagined a bogus algorithm");
+		}
+
+		int ret = fuzz_checkpubkey_line(line, 5, "/home/me/authorized_keys",
+			algoname, algolen,
+			keyblob->data, keyblob->len);
+
+		if (ret == DROPBEAR_SUCCESS) {
+			/* fuzz_checkpubkey_line() should have cleaned up for failure */
+			svr_pubkey_options_cleanup();
+		}
+
+		buf_free(line);
+		buf_free(keyblob);
+		m_free(algoname);
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzz/fuzzer-verify.c

@@ -0,0 +1,95 @@
+#include "fuzz.h"
+#include "session.h"
+#include "fuzz-wrapfd.h"
+#include "debug.h"
+#include "dss.h"
+#include "ed25519.h"
+
+static void setup_fuzzer(void) {
+	fuzz_common_setup();
+}
+
+static buffer *verifydata;
+
+/* Tests reading a public key and verifying a signature */
+int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+	static int once = 0;
+	if (!once) {
+		setup_fuzzer();
+		verifydata = buf_new(30);
+		buf_putstring(verifydata, "x", 1);
+		once = 1;
+	}
+
+	if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
+		return 0;
+	}
+
+	m_malloc_set_epoch(1);
+
+	if (setjmp(fuzz.jmp) == 0) {
+		sign_key *key = new_sign_key();
+		enum signkey_type keytype = DROPBEAR_SIGNKEY_ANY;
+		if (buf_get_pub_key(fuzz.input, key, &keytype) == DROPBEAR_SUCCESS) {
+			enum signature_type sigtype;
+			if (keytype == DROPBEAR_SIGNKEY_RSA) {
+				/* Flip a coin to decide rsa signature type */
+				int flag = buf_getbyte(fuzz.input);
+				if (flag & 0x01) {
+					sigtype = DROPBEAR_SIGNATURE_RSA_SHA256;
+				} else {
+					sigtype = DROPBEAR_SIGNATURE_RSA_SHA1;
+				}
+			} else {
+				sigtype = signature_type_from_signkey(keytype);
+			}
+			if (buf_verify(fuzz.input, key, sigtype, verifydata) == DROPBEAR_SUCCESS) {
+				/* The fuzzer is capable of generating keys with a signature to match.
+				We don't want false positives if the key is bogus, since a client/server 
+				wouldn't be trusting a bogus key anyway */
+				int boguskey = 0;
+
+				if (keytype == DROPBEAR_SIGNKEY_DSS) {
+					/* So far have seen dss keys with bad p/q/g domain parameters */
+					int pprime, qprime, trials;
+					trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->p));
+					assert(mp_prime_is_prime(key->dsskey->p, trials, &pprime) == MP_OKAY);
+					trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->q));
+					assert(mp_prime_is_prime(key->dsskey->q, trials, &qprime) == MP_OKAY);
+					boguskey = !(pprime && qprime);
+					/* Could also check g**q mod p == 1 */
+				}
+
+				if (keytype == DROPBEAR_SIGNKEY_SK_ED25519 || keytype == DROPBEAR_SIGNKEY_ED25519) {
+					dropbear_ed25519_key **eck = (dropbear_ed25519_key**)signkey_key_ptr(key, keytype);
+					if (eck && *eck) {
+						int i;
+						/* we've seen all-zero keys validate */
+						boguskey = 1;
+						for (i = 0; i < CURVE25519_LEN; i++) {
+							if ((*eck)->priv[i] != 0x00 || (*eck)->pub[i] != 0x00) {
+								boguskey = 0;
+							}
+						}
+
+					}
+				}
+
+				if (!boguskey) {
+					printf("Random key/signature managed to verify!\n");
+					abort();
+				}
+
+
+			}
+		}
+		sign_key_free(key);
+		m_malloc_free_epoch(1, 0);
+	} else {
+		m_malloc_free_epoch(1, 1);
+		TRACE(("dropbear_exit longjmped"))
+		/* dropbear_exit jumped here */
+	}
+
+	return 0;
+}

fuzzers_test.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# runs fuzz corpus with standalone fuzzers
+
+result=0
+
+test -d fuzzcorpus && hg --repository fuzzcorpus/ pull || hg clone https://hg.ucc.asn.au/dropbear-fuzzcorpus fuzzcorpus || exit 1
+for f in `make list-fuzz-targets`; do
+    # use xargs to split the too-long argument list
+    # -q quiet because travis has a logfile limit
+    echo fuzzcorpus/$f/* | xargs -n 1000 ./$f -q || result=1
+done
+
+exit $result

libtomcrypt/Makefile.in

@@ -42,7 +42,7 @@ ARFLAGS   = r
 EXTRALIBS = ../libtommath/libtommath.a
 
 #Compilation flags
-LTC_CFLAGS  = -Isrc/headers/ -I$(srcdir)/src/headers/ -I../ -I$(srcdir)/../ -DLTC_SOURCE -I../libtommath/ -I$(srcdir)/../libtommath/ $(CFLAGS)
+LTC_CFLAGS  = -Isrc/headers/ -I$(srcdir)/src/headers/ -I../ -I$(srcdir)/../src -DLTC_SOURCE -I../libtommath/ -I$(srcdir)/../libtommath/ $(CFLAGS) $(CPPFLAGS)
 LTC_LDFLAGS = $(LDFLAGS) $(EXTRALIBS)
 VERSION=1.18.1
 

libtomcrypt/changes

@@ -1,3 +1,16 @@
+July 1st, 2018
+v1.18.2
+      -- Fix Side Channel Based ECDSA Key Extraction (CVE-2018-12437) (PR #408)
+      -- Fix potential stack overflow when DER flexi-decoding (CVE-2018-0739) (PR #373)
+      -- Fix two-key 3DES (PR #390)
+      -- Fix accelerated CTR mode (PR #359)
+      -- Fix Fortuna PRNG (PR #363)
+      -- Fix compilation on platforms where cc doesn't point to gcc (PR #382)
+      -- Fix using the wrong environment variable LT instead of LIBTOOL (PR #392)
+      -- Fix build on platforms where the compiler provides __WCHAR_MAX__ but wchar.h is not available (PR #390)
+      -- Fix & re-factor crypt_list_all_sizes() and crypt_list_all_constants() (PR #414)
+      -- Minor fixes (PR's #350 #351 #375 #377 #378 #379)
+
 January 22nd, 2018
 v1.18.1
       -- Fix wrong SHA3 blocksizes, thanks to Claus Fischer for reporting this via Mail (PR #329)

libtomcrypt/demos/constants.c

@@ -65,9 +65,10 @@ int main(int argc, char **argv)
          /* get and print the length of the names (and values) list */
          if (crypt_list_all_constants(NULL, &names_list_len) != 0) exit(EXIT_FAILURE);
          /* get and print the names (and values) list */
-         names_list = malloc(names_list_len);
+         if ((names_list = malloc(names_list_len)) == NULL) exit(EXIT_FAILURE);
          if (crypt_list_all_constants(names_list, &names_list_len) != 0) exit(EXIT_FAILURE);
          printf("%s\n", names_list);
+         free(names_list);
       }
    } else if (argc == 3) {
       if (strcmp(argv[1], "-s") == 0) {

libtomcrypt/demos/sizes.c

@@ -42,9 +42,10 @@ int main(int argc, char **argv)
       printf("  need to allocate %u bytes \n\n", sizes_list_len);
 
       /* get and print the names (and sizes) list */
-      sizes_list = malloc(sizes_list_len);
+      if ((sizes_list = malloc(sizes_list_len)) == NULL) exit(EXIT_FAILURE);
       if (crypt_list_all_sizes(sizes_list, &sizes_list_len) != 0) exit(EXIT_FAILURE);
       printf("  supported sizes:\n\n%s\n\n", sizes_list);
+      free(sizes_list);
    } else if (argc == 2) {
       if (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--help") == 0) {
          char* base = strdup(basename(argv[0]));
@@ -60,9 +61,10 @@ int main(int argc, char **argv)
          /* get and print the length of the names (and sizes) list */
          if (crypt_list_all_sizes(NULL, &sizes_list_len) != 0) exit(EXIT_FAILURE);
          /* get and print the names (and sizes) list */
-         sizes_list = malloc(sizes_list_len);
+         if ((sizes_list = malloc(sizes_list_len)) == NULL) exit(EXIT_FAILURE);
          if (crypt_list_all_sizes(sizes_list, &sizes_list_len) != 0) exit(EXIT_FAILURE);
          printf("%s\n", sizes_list);
+         free(sizes_list);
       }
    } else if (argc == 3) {
       if (strcmp(argv[1], "-s") == 0) {

libtomcrypt/demos/timing.c

@@ -466,7 +466,7 @@ static void time_cipher_lrw(void)
    tally_results(1);
 }
 #else
-static void time_cipher_lrw(void) { fprintf(stderr, "NO LRW\n"); return 0; }
+static void time_cipher_lrw(void) { fprintf(stderr, "NO LRW\n"); }
 #endif
 
 

libtomcrypt/demos/tv_gen.c

@@ -78,7 +78,7 @@ void cipher_gen(void)
             printf("keysize error: %s\n", error_to_string(err));
             exit(EXIT_FAILURE);
          }
-         if (kl == lastkl) break;
+         if (kl == lastkl) continue;
          lastkl = kl;
          fprintf(out, "Key Size: %d bytes\n", kl);
 

libtomcrypt/doc/Doxyfile

@@ -38,7 +38,7 @@ PROJECT_NAME           = LibTomCrypt
 # could be handy for archiving the generated documentation or if some version
 # control system is used.
 
-PROJECT_NUMBER=1.18.1
+PROJECT_NUMBER=1.18.2
 
 # Using the PROJECT_BRIEF tag one can provide an optional one line description
 # for a project that appears at the top of each page and should give viewer a

libtomcrypt/doc/crypt.tex

@@ -3666,11 +3666,15 @@ key, and any hash that produces at least a 256--bit output.  However, to make th
 it has been fixed to those choices.
 
 Fortuna is more secure than Yarrow in the sense that attackers who learn parts of the entropy being
-added to the PRNG learn far less about the state than that of Yarrow.  Without getting into to many
+added to the PRNG learn far less about the state than that of Yarrow.  Without getting into too many
 details Fortuna has the ability to recover from state determination attacks where the attacker starts
 to learn information from the PRNGs output about the internal state.  Yarrow on the other hand, cannot
 recover from that problem until new entropy is added to the pool and put to use through the ready() function.
 
+For detailed information on how the algorithm works and what you have to do to maintain the secure state
+get a copy of the book\footnote{Niels Ferguson and Bruce Schneier, Practical Cryptography. ISBN 0-471-22357-3.} or
+read the paper online\footnote{\url{https://www.schneier.com/academic/paperfiles/fortuna.pdf} [Accessed on 7th Dec. 2017]}.
+
 \subsubsection{RC4}
 
 RC4 is an old stream cipher that can also double duty as a PRNG in a pinch.  You key RC4 by

libtomcrypt/makefile.mingw

@@ -27,7 +27,7 @@ EXTRALIBS = -L../libtommath -ltommath
 #Compilation flags
 LTC_CFLAGS  = -Isrc/headers -Itests -DLTC_SOURCE $(CFLAGS)
 LTC_LDFLAGS = $(LDFLAGS) $(EXTRALIBS)
-VERSION=1.18.1
+VERSION=1.18.2
 
 #Libraries to be created
 LIBMAIN_S =libtomcrypt.a

libtomcrypt/makefile.msvc

@@ -22,7 +22,7 @@ EXTRALIBS = ../libtommath/tommath.lib
 #Compilation flags
 LTC_CFLAGS  = /nologo /Isrc/headers/ /Itests/ /D_CRT_SECURE_NO_WARNINGS /D_CRT_NONSTDC_NO_DEPRECATE /DLTC_SOURCE /W3 $(CFLAGS)
 LTC_LDFLAGS = advapi32.lib $(EXTRALIBS)
-VERSION=1.18.1
+VERSION=1.18.2
 
 #Libraries to be created (this makefile builds only static libraries)
 LIBMAIN_S =tomcrypt.lib

libtomcrypt/makefile.shared

@@ -16,19 +16,19 @@
 
 PLATFORM := $(shell uname | sed -e 's/_.*//')
 
-ifndef LT
+ifndef LIBTOOL
   ifeq ($(PLATFORM), Darwin)
-    LT:=glibtool
+    LIBTOOL:=glibtool
   else
-    LT:=libtool
+    LIBTOOL:=libtool
   endif
 endif
 ifeq ($(PLATFORM), CYGWIN)
   NO_UNDEFINED:=-no-undefined
 endif
-LTCOMPILE = $(LT) --mode=compile --tag=CC $(CC)
-INSTALL_CMD = $(LT) --mode=install install
-UNINSTALL_CMD = $(LT) --mode=uninstall rm
+LTCOMPILE = $(LIBTOOL) --mode=compile --tag=CC $(CC)
+INSTALL_CMD = $(LIBTOOL) --mode=install install
+UNINSTALL_CMD = $(LIBTOOL) --mode=uninstall rm
 
 #Output filenames for various targets.
 ifndef LIBNAME
@@ -49,15 +49,15 @@ src/ciphers/aes/aes_enc.o: src/ciphers/aes/aes.c src/ciphers/aes/aes_tab.c
 LOBJECTS = $(OBJECTS:.o=.lo)
 
 $(LIBNAME): $(OBJECTS)
-	$(LT) --mode=link --tag=CC $(CC) $(LTC_CFLAGS) $(CPPFLAGS) $(LTC_LDFLAGS) $(LOBJECTS) $(EXTRALIBS) -o $@ -rpath $(LIBPATH) -version-info $(VERSION_LT) $(NO_UNDEFINED)
+	$(LIBTOOL) --mode=link --tag=CC $(CC) $(LTC_LDFLAGS) $(LOBJECTS) $(EXTRALIBS) -o $@ -rpath $(LIBPATH) -version-info $(VERSION_LT) $(NO_UNDEFINED)
 
 test: $(call print-help,test,Builds the library and the 'test' application to run all self-tests) $(LIBNAME) $(TOBJECTS)
-	$(LT) --mode=link --tag=CC $(CC) $(LTC_CFLAGS) $(CPPFLAGS) $(LTC_LDFLAGS) -o $(TEST) $(TOBJECTS) $(LIBNAME) $(EXTRALIBS)
+	$(LIBTOOL) --mode=link --tag=CC $(CC) $(LTC_LDFLAGS) -o $(TEST) $(TOBJECTS) $(LIBNAME) $(EXTRALIBS)
 
 # build the demos from a template
 define DEMO_template
 $(1): $(call print-help,$(1),Builds the library and the '$(1)' demo) demos/$(1).o $$(LIBNAME)
-	$$(LT) --mode=link --tag=CC $$(CC) $$(LTC_CFLAGS) $$(CPPFLAGS) $$(LTC_LDFLAGS) $$^ $$(EXTRALIBS) -o $(1)
+	$$(LIBTOOL) --mode=link --tag=CC $$(CC) $$(LTC_LDFLAGS) $$^ $$(EXTRALIBS) -o $(1)
 endef
 
 $(foreach demo, $(strip $(DEMOS)), $(eval $(call DEMO_template,$(demo))))

libtomcrypt/makefile.unix

@@ -39,7 +39,7 @@ EXTRALIBS = ../libtommath/libtommath.a
 #Compilation flags
 LTC_CFLAGS  = -Isrc/headers -Itests -DLTC_SOURCE $(CFLAGS)
 LTC_LDFLAGS = $(LDFLAGS) $(EXTRALIBS)
-VERSION=1.18.1
+VERSION=1.18.2
 
 #Libraries to be created (this makefile builds only static libraries)
 LIBMAIN_S =libtomcrypt.a

libtomcrypt/makefile_include.mk

@@ -3,8 +3,8 @@
 #  (GNU make only)
 
 # The version - BEWARE: VERSION, VERSION_PC and VERSION_LT are updated via ./updatemakes.sh
-VERSION=1.18.1
-VERSION_PC=1.18.1
+VERSION=1.18.2
+VERSION_PC=1.18.2
 # http://www.gnu.org/software/libtool/manual/html_node/Updating-version-info.html
 VERSION_LT=1:1
 
@@ -13,9 +13,23 @@ ifndef CROSS_COMPILE
   CROSS_COMPILE:=
 endif
 
-ifeq ($(CC),cc)
-  CC := $(CROSS_COMPILE)gcc
+# We only need to go through this dance of determining the right compiler if we're using
+# cross compilation, otherwise $(CC) is fine as-is.
+ifneq (,$(CROSS_COMPILE))
+ifeq ($(origin CC),default)
+CSTR := "\#ifdef __clang__\nCLANG\n\#endif\n"
+ifeq ($(PLATFORM),FreeBSD)
+  # XXX: FreeBSD needs extra escaping for some reason
+  CSTR := $$$(CSTR)
 endif
+ifneq (,$(shell echo $(CSTR) | $(CC) -E - | grep CLANG))
+  CC := $(CROSS_COMPILE)clang
+else
+  CC := $(CROSS_COMPILE)gcc
+endif # Clang
+endif # cc is Make's default
+endif # CROSS_COMPILE non-empty
+
 LD:=$(CROSS_COMPILE)ld
 AR:=$(CROSS_COMPILE)ar
 
@@ -24,7 +38,12 @@ AR:=$(CROSS_COMPILE)ar
 ARFLAGS:=r
 
 ifndef MAKE
-  MAKE:=make
+# BSDs refer to GNU Make as gmake
+ifneq (,$(findstring $(PLATFORM),FreeBSD OpenBSD DragonFly NetBSD))
+  MAKE=gmake
+else
+  MAKE=make
+endif
 endif
 
 ifndef INSTALL_CMD
@@ -389,7 +408,7 @@ doc/crypt.pdf: $(call print-help,doc/crypt.pdf,Builds the Developer Manual)
 	$(MAKE) -C doc/ crypt.pdf V=$(V)
 
 
-install_all: $(call print-help,install_all,Install everything - library bins docs tests) install install_bins install_docs install_test
+install_all: $(call print-help,install_all,Install everything - library bins docs tests) install install_bins install_docs
 
 INSTALL_OPTS ?= -m 644
 

libtomcrypt/notes/cipher_tv.txt

@@ -1434,6 +1434,58 @@ Key Size: 8 bytes
 
 
 Cipher: 3des
+Key Size: 16 bytes
+ 0: DF0B6C9C31CD0CE4
+ 1: 9B3503FDF249920B
+ 2: 653924639C39E7FF
+ 3: 6A29E0A7F42025BB
+ 4: 1628B719BC875D20
+ 5: 7D77004A18D0C0B2
+ 6: 4D21684EFE962DC1
+ 7: B6BD7F82B648A364
+ 8: 1F87ABAD83D19E96
+ 9: 3DF3533220C3CDED
+10: D0E7D0ABFBA68747
+11: 109FE5B38D74E6C9
+12: AE12C4B4D523784F
+13: 953CD7F264166764
+14: 70B3A87D72FA0A22
+15: 9C9D09AC66AB8F6D
+16: 4A15AEACB35B76F0
+17: EFA32F95623BCF1A
+18: 679901F7737E195C
+19: 221BB06209DDFCF4
+20: 0889A953C60BB1BF
+21: 88F2249380E2D5D9
+22: 5AB26168B7FA24D5
+23: 934229150997D390
+24: 535E4F4C4DA97062
+25: 03E8D711AC2B8154
+26: CB5EF6E72EA3EC49
+27: 9278A864F488C94A
+28: CB91B77401DAF004
+29: 4D0BA1C9794E0099
+30: 9CFA24A21F48043F
+31: BB6B3A33AEEC01F4
+32: F2A8566E0FF6033D
+33: E6AC213000E955E6
+34: 91F5FF42BBE0B81B
+35: 6506D72ADEA70E12
+36: F9BD8C0506C7CC4E
+37: 89CD85D1C98439ED
+38: 409410E3E7D66B10
+39: 4CA64F96F4F3D216
+40: 383D18FBF8C006BC
+41: 3806A8CB006EC243
+42: EE73C06D903D2FCF
+43: 624BFD3FAD7ED9EB
+44: 1B5457F2731FB5D1
+45: 4EC4632DFAC9D5D6
+46: 8F0B3100FAD612C5
+47: F955FCAD55AC6C90
+48: BEB5F023BD413960
+49: BDC369F3288ED754
+
 Key Size: 24 bytes
  0: 58ED248F77F6B19E
  1: DA5C39983FD34F30

libtomcrypt/src/ciphers/aes/aes.c

@@ -10,8 +10,8 @@
 /* AES implementation by Tom St Denis
  *
  * Derived from the Public Domain source code by
- 
----  
+
+---
   * rijndael-alg-fst.c
   *
   * @version 3.0 (December 2000)
@@ -26,13 +26,13 @@
 /**
   @file aes.c
   Implementation of AES
-*/   
+*/
 
 #include "tomcrypt.h"
 
 #ifdef LTC_RIJNDAEL
 
-#ifndef ENCRYPT_ONLY 
+#ifndef ENCRYPT_ONLY
 
 #define SETUP    rijndael_setup
 #define ECB_ENC  rijndael_ecb_encrypt
@@ -125,20 +125,20 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
     ulong32 temp, *rk;
 #ifndef ENCRYPT_ONLY
     ulong32 *rrk;
-#endif    
+#endif
     LTC_ARGCHK(key  != NULL);
     LTC_ARGCHK(skey != NULL);
-  
+
     if (keylen != 16 && keylen != 24 && keylen != 32) {
        return CRYPT_INVALID_KEYSIZE;
     }
-    
+
     if (num_rounds != 0 && num_rounds != (10 + ((keylen/8)-2)*2)) {
        return CRYPT_INVALID_ROUNDS;
     }
-    
+
     skey->rijndael.Nr = 10 + ((keylen/8)-2)*2;
-        
+
     /* setup the forward key */
     i                 = 0;
     rk                = skey->rijndael.eK;
@@ -163,7 +163,7 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
         LOAD32H(rk[5], key + 20);
         for (;;) {
         #ifdef _MSC_VER
-            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 5]; 
+            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 5];
         #else
             temp = rk[5];
         #endif
@@ -185,7 +185,7 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
         LOAD32H(rk[7], key + 28);
         for (;;) {
         #ifdef _MSC_VER
-            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 7]; 
+            temp = skey->rijndael.eK[rk - skey->rijndael.eK + 7];
         #else
             temp = rk[7];
         #endif
@@ -209,11 +209,11 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
        return CRYPT_ERROR;
     }
 
-#ifndef ENCRYPT_ONLY    
+#ifndef ENCRYPT_ONLY
     /* setup the inverse key now */
     rk   = skey->rijndael.dK;
     rrk  = skey->rijndael.eK + (28 + keylen) - 4;
-    
+
     /* apply the inverse MixColumn transform to all round keys but the first and the last: */
     /* copy first */
     *rk++ = *rrk++;
@@ -221,11 +221,11 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
     *rk++ = *rrk++;
     *rk   = *rrk;
     rk -= 3; rrk -= 3;
-    
+
     for (i = 1; i < skey->rijndael.Nr; i++) {
         rrk -= 4;
         rk  += 4;
-    #ifdef LTC_SMALL_CODE        
+    #ifdef LTC_SMALL_CODE
         temp = rrk[0];
         rk[0] = setup_mix2(temp);
         temp = rrk[1];
@@ -259,8 +259,8 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
             Tks1[byte(temp, 2)] ^
             Tks2[byte(temp, 1)] ^
             Tks3[byte(temp, 0)];
-      #endif            
-     
+      #endif
+
     }
 
     /* copy last */
@@ -272,7 +272,7 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
     *rk   = *rrk;
 #endif /* ENCRYPT_ONLY */
 
-    return CRYPT_OK;   
+    return CRYPT_OK;
 }
 
 /**
@@ -283,21 +283,21 @@ int SETUP(const unsigned char *key, int keylen, int num_rounds, symmetric_key *s
   @return CRYPT_OK if successful
 */
 #ifdef LTC_CLEAN_STACK
-static int _rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) 
+static int _rijndael_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
 #else
 int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
 #endif
 {
     ulong32 s0, s1, s2, s3, t0, t1, t2, t3, *rk;
     int Nr, r;
-   
+
     LTC_ARGCHK(pt != NULL);
     LTC_ARGCHK(ct != NULL);
     LTC_ARGCHK(skey != NULL);
-    
+
     Nr = skey->rijndael.Nr;
     rk = skey->rijndael.eK;
-    
+
     /*
      * map byte array block to cipher state
      * and add initial round key:
@@ -335,7 +335,7 @@ int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
             Te2(byte(s1, 1)) ^
             Te3(byte(s2, 0)) ^
             rk[3];
-        if (r == Nr-2) { 
+        if (r == Nr-2) {
            break;
         }
         s0 = t0; s1 = t1; s2 = t2; s3 = t3;
@@ -436,7 +436,7 @@ int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
         (Te4_3[byte(t3, 3)]) ^
         (Te4_2[byte(t0, 2)]) ^
         (Te4_1[byte(t1, 1)]) ^
-        (Te4_0[byte(t2, 0)]) ^ 
+        (Te4_0[byte(t2, 0)]) ^
         rk[3];
     STORE32H(s3, ct+12);
 
@@ -444,7 +444,7 @@ int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
 }
 
 #ifdef LTC_CLEAN_STACK
-int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey) 
+int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
 {
    int err = _rijndael_ecb_encrypt(pt, ct, skey);
    burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);
@@ -452,17 +452,17 @@ int ECB_ENC(const unsigned char *pt, unsigned char *ct, symmetric_key *skey)
 }
 #endif
 
-#ifndef ENCRYPT_ONLY 
+#ifndef ENCRYPT_ONLY
 
 /**
   Decrypts a block of text with AES
   @param ct The input ciphertext (16 bytes)
   @param pt The output plaintext (16 bytes)
-  @param skey The key as scheduled 
+  @param skey The key as scheduled
   @return CRYPT_OK if successful
 */
 #ifdef LTC_CLEAN_STACK
-static int _rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) 
+static int _rijndael_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
 #else
 int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
 #endif
@@ -473,7 +473,7 @@ int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
     LTC_ARGCHK(pt != NULL);
     LTC_ARGCHK(ct != NULL);
     LTC_ARGCHK(skey != NULL);
-    
+
     Nr = skey->rijndael.Nr;
     rk = skey->rijndael.dK;
 
@@ -514,13 +514,13 @@ int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
             Td3(byte(s0, 0)) ^
             rk[3];
         if (r == Nr-2) {
-           break; 
+           break;
         }
         s0 = t0; s1 = t1; s2 = t2; s3 = t3;
     }
     rk += 4;
 
-#else       
+#else
 
     /*
      * Nr - 1 full rounds:
@@ -624,7 +624,7 @@ int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
 
 
 #ifdef LTC_CLEAN_STACK
-int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey) 
+int ECB_DEC(const unsigned char *ct, unsigned char *pt, symmetric_key *skey)
 {
    int err = _rijndael_ecb_decrypt(ct, pt, skey);
    burn_stack(sizeof(unsigned long)*8 + sizeof(unsigned long*) + sizeof(int)*2);
@@ -640,51 +640,51 @@ int ECB_TEST(void)
 {
  #ifndef LTC_TEST
     return CRYPT_NOP;
- #else    
+ #else
  int err;
  static const struct {
      int keylen;
      unsigned char key[32], pt[16], ct[16];
  } tests[] = {
     { 16,
-      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 
-        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f }, 
+      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+        0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f },
       { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
-      { 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30, 
+      { 0x69, 0xc4, 0xe0, 0xd8, 0x6a, 0x7b, 0x04, 0x30,
         0xd8, 0xcd, 0xb7, 0x80, 0x70, 0xb4, 0xc5, 0x5a }
-    }, { 
+    }, {
       24,
-      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 
+      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
         0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 },
       { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
-      { 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0, 
+      { 0xdd, 0xa9, 0x7c, 0xa4, 0x86, 0x4c, 0xdf, 0xe0,
         0x6e, 0xaf, 0x70, 0xa0, 0xec, 0x0d, 0x71, 0x91 }
     }, {
       32,
-      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 
+      { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
         0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f,
-        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 
+        0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
         0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f },
       { 0x00, 0x11, 0x22, 0x33, 0x44, 0x55, 0x66, 0x77,
         0x88, 0x99, 0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff },
-      { 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf, 
+      { 0x8e, 0xa2, 0xb7, 0xca, 0x51, 0x67, 0x45, 0xbf,
         0xea, 0xfc, 0x49, 0x90, 0x4b, 0x49, 0x60, 0x89 }
     }
  };
- 
- symmetric_key key;
- unsigned char tmp[2][16];
- int i, y;
- 
- for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
+
+  symmetric_key key;
+  unsigned char tmp[2][16];
+  int i, y;
+
+  for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
     zeromem(&key, sizeof(key));
-    if ((err = rijndael_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) { 
+    if ((err = rijndael_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
        return err;
     }
-  
+
     rijndael_ecb_encrypt(tests[i].pt, tmp[0], &key);
     rijndael_ecb_decrypt(tmp[0], tmp[1], &key);
     if (compare_testvector(tmp[0], 16, tests[i].ct, 16, "AES Encrypt", i) ||
@@ -692,20 +692,20 @@ int ECB_TEST(void)
         return CRYPT_FAIL_TESTVECTOR;
     }
 
-      /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
-      for (y = 0; y < 16; y++) tmp[0][y] = 0;
-      for (y = 0; y < 1000; y++) rijndael_ecb_encrypt(tmp[0], tmp[0], &key);
-      for (y = 0; y < 1000; y++) rijndael_ecb_decrypt(tmp[0], tmp[0], &key);
-      for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
- }       
- return CRYPT_OK;
+    /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
+    for (y = 0; y < 16; y++) tmp[0][y] = 0;
+    for (y = 0; y < 1000; y++) rijndael_ecb_encrypt(tmp[0], tmp[0], &key);
+    for (y = 0; y < 1000; y++) rijndael_ecb_decrypt(tmp[0], tmp[0], &key);
+    for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
+  }
+  return CRYPT_OK;
  #endif
 }
 
 #endif /* ENCRYPT_ONLY */
 
 
-/** Terminate the context 
+/** Terminate the context
    @param skey    The scheduled key
 */
 void ECB_DONE(symmetric_key *skey)

libtomcrypt/src/ciphers/aes/aes_tab.c

@@ -94,7 +94,7 @@ static const ulong32 TE0[256] = {
     0x7bb0b0cbUL, 0xa85454fcUL, 0x6dbbbbd6UL, 0x2c16163aUL,
 };
 
-#ifndef PELI_TAB
+#if !defined(PELI_TAB) && defined(LTC_SMALL_CODE)
 static const ulong32 Te4[256] = {
     0x63636363UL, 0x7c7c7c7cUL, 0x77777777UL, 0x7b7b7b7bUL,
     0xf2f2f2f2UL, 0x6b6b6b6bUL, 0x6f6f6f6fUL, 0xc5c5c5c5UL,
@@ -1017,11 +1017,13 @@ static const ulong32 Tks3[] = {
 
 #endif /* SMALL CODE */
 
+#ifndef PELI_TAB
 static const ulong32 rcon[] = {
     0x01000000UL, 0x02000000UL, 0x04000000UL, 0x08000000UL,
     0x10000000UL, 0x20000000UL, 0x40000000UL, 0x80000000UL,
     0x1B000000UL, 0x36000000UL, /* for 128-bit blocks, Rijndael never uses more than 10 rcon values */
 };
+#endif
 
 #endif /* __LTC_AES_TAB_C__ */
 

libtomcrypt/src/ciphers/twofish/twofish.c

@@ -7,9 +7,9 @@
  * guarantee it works.
  */
 
- /** 
+ /**
    @file twofish.c
-   Implementation of Twofish by Tom St Denis 
+   Implementation of Twofish by Tom St Denis
  */
 #include "tomcrypt.h"
 
@@ -145,14 +145,14 @@ static ulong32 gf_mult(ulong32 a, ulong32 b, ulong32 p)
    result = P[0] = B[0] = 0;
 
    /* unrolled branchless GF multiplier */
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1); 
-   result ^= B[a&1]; 
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1]; a >>= 1;  B[1] = P[B[1]>>7] ^ (B[1] << 1);
+   result ^= B[a&1];
 
    return result;
 }
@@ -243,7 +243,7 @@ static void h_func(const unsigned char *in, unsigned char *out, unsigned char *M
   unsigned char y[4];
   for (x = 0; x < 4; x++) {
       y[x] = in[x];
- }
+  }
   switch (k) {
      case 4:
             y[0] = (unsigned char)(sbox(1, (ulong32)y[0]) ^ M[4 * (6 + offset) + 0]);
@@ -439,7 +439,7 @@ int twofish_setup(const unsigned char *key, int keylen, int num_rounds, symmetri
    /* small ram variant */
    switch (k) {
          case 4 : skey->twofish.start = 0; break;
-         case 3 : skey->twofish.start = 1; break; 
+         case 3 : skey->twofish.start = 1; break;
          default: skey->twofish.start = 2; break;
    }
 #endif
@@ -473,18 +473,18 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
     int r;
 #if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
     ulong32 *S1, *S2, *S3, *S4;
-#endif    
+#endif
 
     LTC_ARGCHK(pt   != NULL);
     LTC_ARGCHK(ct   != NULL);
     LTC_ARGCHK(skey != NULL);
-    
+
 #if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
     S1 = skey->twofish.S[0];
     S2 = skey->twofish.S[1];
     S3 = skey->twofish.S[2];
     S4 = skey->twofish.S[3];
-#endif    
+#endif
 
     LOAD32L(a,&pt[0]); LOAD32L(b,&pt[4]);
     LOAD32L(c,&pt[8]); LOAD32L(d,&pt[12]);
@@ -492,20 +492,20 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
     b ^= skey->twofish.K[1];
     c ^= skey->twofish.K[2];
     d ^= skey->twofish.K[3];
-    
+
     k  = skey->twofish.K + 8;
     for (r = 8; r != 0; --r) {
         t2 = g1_func(b, skey);
         t1 = g_func(a, skey) + t2;
         c  = RORc(c ^ (t1 + k[0]), 1);
         d  = ROLc(d, 1) ^ (t2 + t1 + k[1]);
-        
+
         t2 = g1_func(d, skey);
         t1 = g_func(c, skey) + t2;
         a  = RORc(a ^ (t1 + k[2]), 1);
         b  = ROLc(b, 1) ^ (t2 + t1 + k[3]);
         k += 4;
-   }
+    }
 
     /* output with "undo last swap" */
     ta = c ^ skey->twofish.K[4];
@@ -533,7 +533,7 @@ int twofish_ecb_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_ke
   Decrypts a block of text with Twofish
   @param ct The input ciphertext (16 bytes)
   @param pt The output plaintext (16 bytes)
-  @param skey The key as scheduled 
+  @param skey The key as scheduled
   @return CRYPT_OK if successful
 */
 #ifdef LTC_CLEAN_STACK
@@ -546,18 +546,18 @@ int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_ke
     int r;
 #if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
     ulong32 *S1, *S2, *S3, *S4;
-#endif    
+#endif
 
     LTC_ARGCHK(pt   != NULL);
     LTC_ARGCHK(ct   != NULL);
     LTC_ARGCHK(skey != NULL);
-    
+
 #if !defined(LTC_TWOFISH_SMALL) && !defined(__GNUC__)
     S1 = skey->twofish.S[0];
     S2 = skey->twofish.S[1];
     S3 = skey->twofish.S[2];
     S4 = skey->twofish.S[3];
-#endif    
+#endif
 
     /* load input */
     LOAD32L(ta,&ct[0]); LOAD32L(tb,&ct[4]);
@@ -588,7 +588,7 @@ int twofish_ecb_decrypt(const unsigned char *ct, unsigned char *pt, symmetric_ke
     b ^= skey->twofish.K[1];
     c ^= skey->twofish.K[2];
     d ^= skey->twofish.K[3];
-    
+
     /* store */
     STORE32L(a, &pt[0]); STORE32L(b, &pt[4]);
     STORE32L(c, &pt[8]); STORE32L(d, &pt[12]);
@@ -612,8 +612,8 @@ int twofish_test(void)
 {
  #ifndef LTC_TEST
     return CRYPT_NOP;
- #else    
- static const struct { 
+ #else
+ static const struct {
      int keylen;
      unsigned char key[32], pt[16], ct[16];
  } tests[] = {
@@ -633,7 +633,7 @@ int twofish_test(void)
        0x85, 0xB6, 0xDC, 0x07, 0x3C, 0xA3, 0x41, 0xB2 },
      { 0x18, 0x2B, 0x02, 0xD8, 0x14, 0x97, 0xEA, 0x45,
        0xF9, 0xDA, 0xAC, 0xDC, 0x29, 0x19, 0x3A, 0x65 }
-   }, { 
+   }, {
      32,
      { 0xD4, 0x3B, 0xB7, 0x55, 0x6E, 0xA3, 0x2E, 0x46,
        0xF2, 0xA2, 0x82, 0xB7, 0xD4, 0x5B, 0x4E, 0x0D,
@@ -647,11 +647,11 @@ int twofish_test(void)
 };
 
 
- symmetric_key key;
- unsigned char tmp[2][16];
- int err, i, y;
- 
- for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
+  symmetric_key key;
+  unsigned char tmp[2][16];
+  int err, i, y;
+
+  for (i = 0; i < (int)(sizeof(tests)/sizeof(tests[0])); i++) {
     if ((err = twofish_setup(tests[i].key, tests[i].keylen, 0, &key)) != CRYPT_OK) {
        return err;
     }
@@ -661,17 +661,17 @@ int twofish_test(void)
           compare_testvector(tmp[1], 16, tests[i].pt, 16, "Twofish Decrypt", i) != 0) {
        return CRYPT_FAIL_TESTVECTOR;
     }
-      /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
-      for (y = 0; y < 16; y++) tmp[0][y] = 0;
-      for (y = 0; y < 1000; y++) twofish_ecb_encrypt(tmp[0], tmp[0], &key);
-      for (y = 0; y < 1000; y++) twofish_ecb_decrypt(tmp[0], tmp[0], &key);
-      for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
- }    
- return CRYPT_OK;
-#endif 
+    /* now see if we can encrypt all zero bytes 1000 times, decrypt and come back where we started */
+    for (y = 0; y < 16; y++) tmp[0][y] = 0;
+    for (y = 0; y < 1000; y++) twofish_ecb_encrypt(tmp[0], tmp[0], &key);
+    for (y = 0; y < 1000; y++) twofish_ecb_decrypt(tmp[0], tmp[0], &key);
+    for (y = 0; y < 16; y++) if (tmp[0][y] != 0) return CRYPT_FAIL_TESTVECTOR;
+  }
+  return CRYPT_OK;
+#endif
 }
 
-/** Terminate the context 
+/** Terminate the context
    @param skey    The scheduled key
 */
 void twofish_done(symmetric_key *skey)

libtomcrypt/src/encauth/ccm/ccm_memory.c

@@ -52,7 +52,7 @@ int ccm_memory(int cipher,
    int            err;
    unsigned long  len, L, x, y, z, CTRlen;
 #ifdef LTC_FAST
-   LTC_FAST_TYPE fastMask = ~0; /* initialize fastMask at all zeroes */
+   LTC_FAST_TYPE fastMask = ~(LTC_FAST_TYPE)0; /* initialize fastMask at all zeroes */
 #endif
    unsigned char mask = 0xff; /* initialize mask at all zeroes */
 

libtomcrypt/src/hashes/helper/hash_file.c

@@ -9,7 +9,7 @@
 #include "tomcrypt.h"
 
 #ifndef LTC_NO_FILE
-/** 
+/**
   @file hash_file.c
   Hash a file, Tom St Denis
 */
@@ -34,7 +34,7 @@ int hash_file(int hash, const char *fname, unsigned char *out, unsigned long *ou
     }
 
     in = fopen(fname, "rb");
-    if (in == NULL) { 
+    if (in == NULL) {
        return CRYPT_FILE_NOTFOUND;
     }
 

libtomcrypt/src/hashes/helper/hash_filehandle.c

@@ -14,13 +14,13 @@
    Hash open files, Tom St Denis
 */
 
-/** 
-  Hash data from an open file handle.  
+/**
+  Hash data from an open file handle.
   @param hash   The index of the hash you want to use
   @param in     The FILE* handle of the file you want to hash
   @param out    [out] The destination of the digest
   @param outlen [in/out] The max size and resulting size of the digest
-  @result CRYPT_OK if successful   
+  @result CRYPT_OK if successful
 */
 int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outlen)
 {
@@ -57,8 +57,8 @@ int hash_filehandle(int hash, FILE *in, unsigned char *out, unsigned long *outle
         }
     } while (x == LTC_FILE_READ_BUFSIZE);
     if ((err = hash_descriptor[hash].done(&md, out)) == CRYPT_OK) {
-    *outlen = hash_descriptor[hash].hashsize;
-        }
+       *outlen = hash_descriptor[hash].hashsize;
+    }
 
 LBL_CLEANBUF:
     zeromem(buf, LTC_FILE_READ_BUFSIZE);

libtomcrypt/src/headers/tomcrypt.h

@@ -27,14 +27,15 @@ extern "C" {
 
 /* version */
 #define CRYPT   0x0118
-#define SCRYPT  "1.18.1"
+#define SCRYPT  "1.18.2"
 
 /* max size of either a cipher/hash block or symmetric key [largest of the two] */
 #define MAXBLOCKSIZE  128
 
+#ifndef TAB_SIZE
 /* descriptor table size */
-/* Dropbear change - this should be smaller, saves some size */
-#define TAB_SIZE    5
+#define TAB_SIZE      32
+#endif
 
 /* error codes [will be expanded in future releases] */
 enum {

libtomcrypt/src/headers/tomcrypt_argchk.h

@@ -45,7 +45,7 @@ void crypt_argchk(const char *v, const char *s, int d) NORETURN;
 
 #elif ARGTYPE == 3
 
-#define LTC_ARGCHK(x) 
+#define LTC_ARGCHK(x)
 #define LTC_ARGCHKVD(x) LTC_ARGCHK(x)
 
 #elif ARGTYPE == 4

libtomcrypt/src/headers/tomcrypt_custom.h

@@ -12,6 +12,12 @@
 
 #include "tomcrypt_dropbear.h"
 
+#include "dbmalloc.h"
+#define XMALLOC m_malloc
+#define XFREE m_free_direct
+#define XREALLOC m_realloc
+#define XCALLOC m_calloc
+
 /* macros for various libc functions you can change for embedded targets */
 #ifndef XMALLOC
 #define XMALLOC  malloc
@@ -68,8 +74,8 @@
   #define LTC_NO_MODES
   #define LTC_NO_HASHES
   #define LTC_NO_MACS
-   #define LTC_NO_PRNGS
-   #define LTC_NO_PK
+  #define LTC_NO_PRNGS
+  #define LTC_NO_PK
   #define LTC_NO_PKCS
   #define LTC_NO_MISC
 #endif /* LTC_NOTHING */
@@ -474,6 +480,13 @@
 #endif
 #endif
 
+#if defined(LTC_DER)
+   #ifndef LTC_DER_MAX_RECURSION
+      /* Maximum recursion limit when processing nested ASN.1 types. */
+      #define LTC_DER_MAX_RECURSION 30
+   #endif
+#endif
+
 #if defined(LTC_MECC) || defined(LTC_MRSA) || defined(LTC_MDSA) || defined(LTC_MKAT)
    /* Include the MPI functionality?  (required by the PK algorithms) */
    #define LTC_MPI

libtomcrypt/src/headers/tomcrypt_dropbear.h

@@ -10,24 +10,18 @@
 #define LTC_SMALL_CODE
 #endif
 
-#if DROPBEAR_BLOWFISH
-#define LTC_BLOWFISH
-#endif
+/* Fewer entries needed */
+#define TAB_SIZE      5
+
 #if DROPBEAR_AES
 #define LTC_RIJNDAEL
 #endif
-/* _TABLES tells it to use tables during setup, _SMALL means to use the smaller scheduled key format
- * (saves 4KB of ram), _ALL_TABLES enables all tables during setup */
-#if DROPBEAR_TWOFISH
-#define LTC_TWOFISH
-#define LTC_TWOFISH_SMALL
-#endif
 
 #if DROPBEAR_3DES
 #define LTC_DES
 #endif
 
-#if DROPBEAR_ENABLE_CTR_MODE
+#if DROPBEAR_ENABLE_CBC_MODE
 #define LTC_CBC_MODE
 #endif
 
@@ -35,6 +29,14 @@
 #define LTC_CTR_MODE
 #endif
 
+#if DROPBEAR_ENABLE_GCM_MODE
+#define LTC_GCM_MODE
+#endif
+
+#if DROPBEAR_CHACHA20POLY1305
+#define LTC_CHACHA
+#define LTC_POLY1305
+#endif
 
 #if DROPBEAR_SHA512
 #define LTC_SHA512
@@ -48,10 +50,8 @@
 #define LTC_SHA256
 #endif
 
+#if DROPBEAR_SHA1
 #define LTC_SHA1
-
-#if DROPBEAR_MD5
-#define LTC_MD5
 #endif
 
 /* ECC */

libtomcrypt/src/headers/tomcrypt_pk.h

@@ -667,16 +667,16 @@ int der_printable_value_decode(int v);
 
 /* UTF-8 */
 #if (defined(SIZE_MAX) || __STDC_VERSION__ >= 199901L || defined(WCHAR_MAX) || defined(__WCHAR_MAX__) || defined(_WCHAR_T) || defined(_WCHAR_T_DEFINED) || defined (__WCHAR_TYPE__)) && !defined(LTC_NO_WCHAR)
-#include <wchar.h>
-#if defined(__WCHAR_MAX__)
-#define LTC_WCHAR_MAX __WCHAR_MAX__
-#elif defined(WCHAR_MAX)
-#define LTC_WCHAR_MAX WCHAR_MAX
-#endif
+   #if defined(__WCHAR_MAX__)
+      #define LTC_WCHAR_MAX __WCHAR_MAX__
+   #else
+      #include <wchar.h>
+      #define LTC_WCHAR_MAX WCHAR_MAX
+   #endif
 /* please note that it might happen that LTC_WCHAR_MAX is undefined */
 #else
-typedef ulong32 wchar_t;
-#define LTC_WCHAR_MAX 0xFFFFFFFF
+   typedef ulong32 wchar_t;
+   #define LTC_WCHAR_MAX 0xFFFFFFFF
 #endif
 
 int der_encode_utf8_string(const wchar_t *in,  unsigned long inlen,

libtomcrypt/src/mac/blake2/blake2bmac_file.c

@@ -23,6 +23,11 @@
 int blake2bmac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(fname);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(mac);
+   LTC_UNUSED_PARAM(maclen);
    return CRYPT_NOP;
 #else
    blake2bmac_state st;

libtomcrypt/src/mac/blake2/blake2smac_file.c

@@ -23,6 +23,11 @@
 int blake2smac_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(fname);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(mac);
+   LTC_UNUSED_PARAM(maclen);
    return CRYPT_NOP;
 #else
    blake2smac_state st;

libtomcrypt/src/mac/f9/f9_file.c

@@ -31,6 +31,12 @@ int f9_file(int cipher,
                     unsigned char *out, unsigned long *outlen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(cipher);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(fname);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
    return CRYPT_NOP;
 #else
    size_t x;

libtomcrypt/src/mac/hmac/hmac_file.c

@@ -30,7 +30,12 @@ int hmac_file(int hash, const char *fname,
                     unsigned char *out, unsigned long *outlen)
 {
 #ifdef LTC_NO_FILE
-    (void)hash; (void)fname; (void)key; (void)keylen; (void)out; (void)outlen;
+   LTC_UNUSED_PARAM(hash);
+   LTC_UNUSED_PARAM(fname);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
     return CRYPT_NOP;
 #else
    hmac_state hmac;

libtomcrypt/src/mac/hmac/hmac_init.c

@@ -20,7 +20,7 @@
 /**
    Initialize an HMAC context.
    @param hmac     The HMAC state
-   @param hash     The index of the hash you want to use 
+   @param hash     The index of the hash you want to use
    @param key      The secret key
    @param keylen   The length of the secret key (octets)
    @return CRYPT_OK if successful
@@ -64,9 +64,9 @@ int hmac_init(hmac_state *hmac, int hash, const unsigned char *key, unsigned lon
         XMEMCPY(hmac->key, key, (size_t)keylen);
     }
 
-        if(keylen < LTC_HMAC_BLOCKSIZE) {
-            zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
-        }
+    if(keylen < LTC_HMAC_BLOCKSIZE) {
+       zeromem((hmac->key) + keylen, (size_t)(LTC_HMAC_BLOCKSIZE - keylen));
+    }
 
     /* Create the initialization vector for step (3) */
     for(i=0; i < LTC_HMAC_BLOCKSIZE;   i++) {
@@ -89,8 +89,8 @@ done:
 #ifdef LTC_CLEAN_STACK
    zeromem(buf, LTC_HMAC_BLOCKSIZE);
 #endif
- 
-   return err;    
+
+   return err;
 }
 
 #endif

libtomcrypt/src/mac/omac/omac_file.c

@@ -31,6 +31,12 @@ int omac_file(int cipher,
                     unsigned char *out, unsigned long *outlen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(cipher);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(filename);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
    return CRYPT_NOP;
 #else
    size_t x;

libtomcrypt/src/mac/pmac/pmac_file.c

@@ -31,6 +31,12 @@ int pmac_file(int cipher,
                     unsigned char *out, unsigned long *outlen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(cipher);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(filename);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
    return CRYPT_NOP;
 #else
    size_t x;

libtomcrypt/src/mac/poly1305/poly1305_file.c

@@ -28,6 +28,11 @@
 int poly1305_file(const char *fname, const unsigned char *key, unsigned long keylen, unsigned char *mac, unsigned long *maclen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(fname);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(mac);
+   LTC_UNUSED_PARAM(maclen);
    return CRYPT_NOP;
 #else
    poly1305_state st;

libtomcrypt/src/mac/xcbc/xcbc_file.c

@@ -31,6 +31,12 @@ int xcbc_file(int cipher,
                     unsigned char *out, unsigned long *outlen)
 {
 #ifdef LTC_NO_FILE
+   LTC_UNUSED_PARAM(cipher);
+   LTC_UNUSED_PARAM(key);
+   LTC_UNUSED_PARAM(keylen);
+   LTC_UNUSED_PARAM(filename);
+   LTC_UNUSED_PARAM(out);
+   LTC_UNUSED_PARAM(outlen);
    return CRYPT_NOP;
 #else
    size_t x;

libtomcrypt/src/math/ltm_desc.c

@@ -15,11 +15,14 @@
 #include <tommath.h>
 
 static const struct {
-    int mpi_code, ltc_code;
+    mp_err mpi_code;
+    int ltc_code;
 } mpi_to_ltc_codes[] = {
    { MP_OKAY ,  CRYPT_OK},
    { MP_MEM  ,  CRYPT_MEM},
    { MP_VAL  ,  CRYPT_INVALID_ARG},
+   { MP_ITER ,  CRYPT_INVALID_PACKET},
+   { MP_BUF  ,  CRYPT_BUFFER_OVERFLOW},
 };
 
 /**
@@ -27,11 +30,11 @@ static const struct {
    @param err    The error to convert
    @return The equivalent LTC error code or CRYPT_ERROR if none found
 */
-static int mpi_to_ltc_error(int err)
+static int mpi_to_ltc_error(mp_err err)
 {
-   int x;
+   size_t x;
 
-   for (x = 0; x < (int)(sizeof(mpi_to_ltc_codes)/sizeof(mpi_to_ltc_codes[0])); x++) {
+   for (x = 0; x < sizeof(mpi_to_ltc_codes)/sizeof(mpi_to_ltc_codes[0]); x++) {
        if (err == mpi_to_ltc_codes[x].mpi_code) {
           return mpi_to_ltc_codes[x].ltc_code;
        }
@@ -39,17 +42,27 @@ static int mpi_to_ltc_error(int err)
    return CRYPT_ERROR;
 }
 
+static int init_mpi(void **a)
+{
+   LTC_ARGCHK(a != NULL);
+
+   *a = XCALLOC(1, sizeof(mp_int));
+   if (*a == NULL) {
+      return CRYPT_MEM;
+   } else {
+      return CRYPT_OK;
+   }
+}
+
 static int init(void **a)
 {
    int err;
 
    LTC_ARGCHK(a != NULL);
 
-   *a = XCALLOC(1, sizeof(mp_int));
-   if (*a == NULL) {
-      return CRYPT_MEM;
+   if ((err = init_mpi(a)) != CRYPT_OK) {
+      return err;
    }
-
    if ((err = mpi_to_ltc_error(mp_init(*a))) != CRYPT_OK) {
       XFREE(*a);
    }
@@ -79,23 +92,25 @@ static int copy(void *a, void *b)
 
 static int init_copy(void **a, void *b)
 {
-   if (init(a) != CRYPT_OK) {
-      return CRYPT_MEM;
-   }
-   return copy(b, *a);
+   int err;
+   LTC_ARGCHK(a  != NULL);
+   LTC_ARGCHK(b  != NULL);
+   if ((err = init_mpi(a)) != CRYPT_OK) return err;
+   return mpi_to_ltc_error(mp_init_copy(*a, b));
 }
 
 /* ---- trivial ---- */
 static int set_int(void *a, ltc_mp_digit b)
 {
    LTC_ARGCHK(a != NULL);
-   return mpi_to_ltc_error(mp_set_int(a, b));
+   mp_set_u32(a, b);
+   return CRYPT_OK;
 }
 
 static unsigned long get_int(void *a)
 {
    LTC_ARGCHK(a != NULL);
-   return mp_get_int(a);
+   return mp_get_ul(a);
 }
 
 static ltc_mp_digit get_digit(void *a, int n)
@@ -116,11 +131,9 @@ static int get_digit_count(void *a)
 
 static int compare(void *a, void *b)
 {
-   int ret;
    LTC_ARGCHK(a != NULL);
    LTC_ARGCHK(b != NULL);
-   ret = mp_cmp(a, b);
-   switch (ret) {
+   switch (mp_cmp(a, b)) {
       case MP_LT: return LTC_MP_LT;
       case MP_EQ: return LTC_MP_EQ;
       case MP_GT: return LTC_MP_GT;
@@ -130,10 +143,8 @@ static int compare(void *a, void *b)
 
 static int compare_d(void *a, ltc_mp_digit b)
 {
-   int ret;
    LTC_ARGCHK(a != NULL);
-   ret = mp_cmp_d(a, b);
-   switch (ret) {
+   switch (mp_cmp_d(a, b)) {
       case MP_LT: return LTC_MP_LT;
       case MP_EQ: return LTC_MP_EQ;
       case MP_GT: return LTC_MP_GT;
@@ -175,14 +186,14 @@ static int write_radix(void *a, char *b, int radix)
 {
    LTC_ARGCHK(a != NULL);
    LTC_ARGCHK(b != NULL);
-   return mpi_to_ltc_error(mp_toradix(a, b, radix));
+   return mpi_to_ltc_error(mp_to_radix(a, b, SIZE_MAX, NULL, radix));
 }
 
 /* get size as unsigned char string */
 static unsigned long unsigned_size(void *a)
 {
    LTC_ARGCHK(a != NULL);
-   return mp_unsigned_bin_size(a);
+   return (unsigned long)mp_ubin_size(a);
 }
 
 /* store */
@@ -190,7 +201,7 @@ static int unsigned_write(void *a, unsigned char *b)
 {
    LTC_ARGCHK(a != NULL);
    LTC_ARGCHK(b != NULL);
-   return mpi_to_ltc_error(mp_to_unsigned_bin(a, b));
+   return mpi_to_ltc_error(mp_to_ubin(a, b, SIZE_MAX, NULL));
 }
 
 /* read */
@@ -198,7 +209,7 @@ static int unsigned_read(void *a, unsigned char *b, unsigned long len)
 {
    LTC_ARGCHK(a != NULL);
    LTC_ARGCHK(b != NULL);
-   return mpi_to_ltc_error(mp_read_unsigned_bin(a, b, len));
+   return mpi_to_ltc_error(mp_from_ubin(a, b, (size_t)len));
 }
 
 /* add */
@@ -403,9 +414,7 @@ static int isprime(void *a, int b, int *c)
    int err;
    LTC_ARGCHK(a != NULL);
    LTC_ARGCHK(c != NULL);
-   if (b == 0) {
-       b = LTC_MILLER_RABIN_REPS;
-   } /* if */
+   b = mp_prime_rabin_miller_trials(mp_count_bits(a));
    err = mpi_to_ltc_error(mp_prime_is_prime(a, b, c));
    *c = (*c == MP_YES) ? LTC_MP_YES : LTC_MP_NO;
    return err;
@@ -420,7 +429,7 @@ static int set_rand(void *a, int size)
 const ltc_math_descriptor ltm_desc = {
 
    "LibTomMath",
-   (int)DIGIT_BIT,
+   (int)MP_DIGIT_BIT,
 
    &init,
    &init_copy,

libtomcrypt/src/math/multi.c

@@ -67,7 +67,6 @@ void ltc_cleanup_multi(void **a, ...)
       cur = va_arg(args, void**);
    }
    va_end(args);
-   return;
 }
 
 #endif

libtomcrypt/src/math/rand_bn.c

@@ -8,7 +8,7 @@
  */
 #include "tomcrypt.h"
 
-#ifdef LTC_MDSA
+#if defined(LTC_MDSA) || defined(LTC_MECC)
 /**
   Generate a random number N with given bitlength (note: MSB can be 0)
 */

libtomcrypt/src/misc/base64/base64_decode.c

@@ -43,8 +43,8 @@ static const unsigned char map_base64[256] = {
 255, 255, 255, 255 };
 #endif /* LTC_BASE64 */
 
-static const unsigned char map_base64url[] = {
 #if defined(LTC_BASE64_URL)
+static const unsigned char map_base64url[] = {
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
@@ -67,8 +67,8 @@ static const unsigned char map_base64url[] = {
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
 255, 255, 255, 255
-#endif /* LTC_BASE64_URL */
 };
+#endif /* LTC_BASE64_URL */
 
 enum {
    relaxed = 0,
@@ -117,8 +117,14 @@ static int _base64_decode_internal(const unsigned char *in,  unsigned long inlen
    }
 
    if (y != 0) {
+      int allow_b64url = 0;
+#ifdef LTC_BASE64_URL
+      if (map == map_base64url) {
+        allow_b64url = 1;
+      }
+#endif
       if (y == 1) return CRYPT_INVALID_PACKET;
-      if ((y + g) != 4 && is_strict && map != map_base64url) return CRYPT_INVALID_PACKET;
+      if ((y + g) != 4 && is_strict && !allow_b64url) return CRYPT_INVALID_PACKET;
       t = t << (6 * (4 - y));
       if (z + y - 1 > *outlen) return CRYPT_BUFFER_OVERFLOW;
       if (y >= 2) out[z++] = (unsigned char) ((t >> 16) & 255);

libtomcrypt/src/misc/crypt/crypt.c

@@ -399,6 +399,7 @@ const char *crypt_build_settings =
 #endif
 #if defined(LTC_DER)
     " DER "
+    " " NAME_VALUE(LTC_DER_MAX_RECURSION) " "
 #endif
 #if defined(LTC_PKCS_1)
     " PKCS#1 "

libtomcrypt/src/misc/crypt/crypt_constants.c

@@ -111,6 +111,7 @@ static const crypt_constant _crypt_constants[] = {
 
 #ifdef LTC_DER
 /* DER handling */
+    {"LTC_DER", 1},
     _C_STRINGIFY(LTC_ASN1_EOL),
     _C_STRINGIFY(LTC_ASN1_BOOLEAN),
     _C_STRINGIFY(LTC_ASN1_INTEGER),
@@ -132,6 +133,9 @@ static const crypt_constant _crypt_constants[] = {
     _C_STRINGIFY(LTC_ASN1_CONSTRUCTED),
     _C_STRINGIFY(LTC_ASN1_CONTEXT_SPECIFIC),
     _C_STRINGIFY(LTC_ASN1_GENERALIZEDTIME),
+    _C_STRINGIFY(LTC_DER_MAX_RECURSION),
+#else
+    {"LTC_DER", 0},
 #endif
 
 #ifdef LTC_CTR_MODE
@@ -248,20 +252,16 @@ int crypt_get_constant(const char* namein, int *valueout) {
 int crypt_list_all_constants(char *names_list, unsigned int *names_list_size) {
     int i;
     unsigned int total_len = 0;
-    char number[32], *ptr;
+    char *ptr;
     int number_len;
     int count = sizeof(_crypt_constants) / sizeof(_crypt_constants[0]);
 
     /* calculate amount of memory required for the list */
     for (i=0; i<count; i++) {
-        total_len += (unsigned int)strlen(_crypt_constants[i].name) + 1;
-        /* the above +1 is for the commas */
-        number_len = snprintf(number, sizeof(number), "%d", _crypt_constants[i].value);
-        if ((number_len < 0) ||
-            ((unsigned int)number_len >= sizeof(number)))
+        number_len = snprintf(NULL, 0, "%s,%d\n", _crypt_constants[i].name, _crypt_constants[i].value);
+        if (number_len < 0)
           return -1;
-        total_len += number_len + 1;
-        /* this last +1 is for newlines (and ending NULL) */
+        total_len += number_len;
     }
 
     if (names_list == NULL) {
@@ -273,16 +273,11 @@ int crypt_list_all_constants(char *names_list, unsigned int *names_list_size) {
         /* build the names list */
         ptr = names_list;
         for (i=0; i<count; i++) {
-            strcpy(ptr, _crypt_constants[i].name);
-            ptr += strlen(_crypt_constants[i].name);
-            strcpy(ptr, ",");
-            ptr += 1;
-
-            number_len = snprintf(number, sizeof(number), "%d", _crypt_constants[i].value);
-            strcpy(ptr, number);
+            number_len = snprintf(ptr, total_len, "%s,%d\n", _crypt_constants[i].name, _crypt_constants[i].value);
+            if (number_len < 0) return -1;
+            if ((unsigned int)number_len > total_len) return -1;
+            total_len -= number_len;
             ptr += number_len;
-            strcpy(ptr, "\n");
-            ptr += 1;
         }
         /* to remove the trailing new-line */
         ptr -= 1;

libtomcrypt/src/misc/crypt/crypt_sizes.c

@@ -307,19 +307,16 @@ int crypt_get_size(const char* namein, unsigned int *sizeout) {
 int crypt_list_all_sizes(char *names_list, unsigned int *names_list_size) {
     int i;
     unsigned int total_len = 0;
-    char number[32], *ptr;
+    char *ptr;
     int number_len;
     int count = sizeof(_crypt_sizes) / sizeof(_crypt_sizes[0]);
 
     /* calculate amount of memory required for the list */
     for (i=0; i<count; i++) {
-        total_len += (unsigned int)strlen(_crypt_sizes[i].name) + 1;
-        /* the above +1 is for the commas */
-        number_len = snprintf(number, sizeof(number), "%u", _crypt_sizes[i].size);
-        if ((number_len < 0) ||
-            ((unsigned int)number_len >= sizeof(number)))
+        number_len = snprintf(NULL, 0, "%s,%u\n", _crypt_sizes[i].name, _crypt_sizes[i].size);
+        if (number_len < 0)
           return -1;
-        total_len += (unsigned int)strlen(number) + 1;
+        total_len += number_len;
         /* this last +1 is for newlines (and ending NULL) */
     }
 
@@ -332,16 +329,11 @@ int crypt_list_all_sizes(char *names_list, unsigned int *names_list_size) {
         /* build the names list */
         ptr = names_list;
         for (i=0; i<count; i++) {
-            strcpy(ptr, _crypt_sizes[i].name);
-            ptr += strlen(_crypt_sizes[i].name);
-            strcpy(ptr, ",");
-            ptr += 1;
-
-            number_len = snprintf(number, sizeof(number), "%u", _crypt_sizes[i].size);
-            strcpy(ptr, number);
+            number_len = snprintf(ptr, total_len, "%s,%u\n", _crypt_sizes[i].name, _crypt_sizes[i].size);
+            if (number_len < 0) return -1;
+            if ((unsigned int)number_len > total_len) return -1;
+            total_len -= number_len;
             ptr += number_len;
-            strcpy(ptr, "\n");
-            ptr += 1;
         }
         /* to remove the trailing new-line */
         ptr -= 1;

libtomcrypt/src/modes/ctr/ctr_encrypt.c

@@ -17,47 +17,17 @@
 #ifdef LTC_CTR_MODE
 
 /**
-  CTR encrypt
+  CTR encrypt software implementation
   @param pt     Plaintext
   @param ct     [out] Ciphertext
   @param len    Length of plaintext (octets)
   @param ctr    CTR state
   @return CRYPT_OK if successful
 */
-int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
+static int _ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
 {
    int x, err;
 
-   LTC_ARGCHK(pt != NULL);
-   LTC_ARGCHK(ct != NULL);
-   LTC_ARGCHK(ctr != NULL);
-
-   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
-       return err;
-   }
-
-   /* is blocklen/padlen valid? */
-   if (ctr->blocklen < 1 || ctr->blocklen > (int)sizeof(ctr->ctr) ||
-       ctr->padlen   < 0 || ctr->padlen   > (int)sizeof(ctr->pad)) {
-      return CRYPT_INVALID_ARG;
-   }
-
-#ifdef LTC_FAST
-   if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
-      return CRYPT_INVALID_ARG;
-   }
-#endif
-
-   /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
-   if ((ctr->padlen == ctr->blocklen) && cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL && (len >= (unsigned long)ctr->blocklen)) {
-      if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) {
-         return err;
-      }
-      pt += (len / ctr->blocklen) * ctr->blocklen;
-      ct += (len / ctr->blocklen) * ctr->blocklen;
-      len %= ctr->blocklen;
-   }
-
    while (len) {
       /* is the pad empty? */
       if (ctr->padlen == ctr->blocklen) {
@@ -87,7 +57,7 @@ int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, s
          ctr->padlen = 0;
       }
 #ifdef LTC_FAST
-      if (ctr->padlen == 0 && len >= (unsigned long)ctr->blocklen) {
+      if ((ctr->padlen == 0) && (len >= (unsigned long)ctr->blocklen)) {
          for (x = 0; x < ctr->blocklen; x += sizeof(LTC_FAST_TYPE)) {
             *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ct + x)) = *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)pt + x)) ^
                                                            *(LTC_FAST_TYPE_PTR_CAST((unsigned char *)ctr->pad + x));
@@ -105,6 +75,63 @@ int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, s
    return CRYPT_OK;
 }
 
+/**
+  CTR encrypt
+  @param pt     Plaintext
+  @param ct     [out] Ciphertext
+  @param len    Length of plaintext (octets)
+  @param ctr    CTR state
+  @return CRYPT_OK if successful
+*/
+int ctr_encrypt(const unsigned char *pt, unsigned char *ct, unsigned long len, symmetric_CTR *ctr)
+{
+   int err, fr;
+
+   LTC_ARGCHK(pt != NULL);
+   LTC_ARGCHK(ct != NULL);
+   LTC_ARGCHK(ctr != NULL);
+
+   if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
+       return err;
+   }
+
+   /* is blocklen/padlen valid? */
+   if ((ctr->blocklen < 1) || (ctr->blocklen > (int)sizeof(ctr->ctr)) ||
+       (ctr->padlen   < 0) || (ctr->padlen   > (int)sizeof(ctr->pad))) {
+      return CRYPT_INVALID_ARG;
+   }
+
+#ifdef LTC_FAST
+   if (ctr->blocklen % sizeof(LTC_FAST_TYPE)) {
+      return CRYPT_INVALID_ARG;
+   }
+#endif
+
+   /* handle acceleration only if pad is empty, accelerator is present and length is >= a block size */
+   if ((cipher_descriptor[ctr->cipher].accel_ctr_encrypt != NULL) && (len >= (unsigned long)ctr->blocklen)) {
+     if (ctr->padlen < ctr->blocklen) {
+       fr = ctr->blocklen - ctr->padlen;
+       if ((err = _ctr_encrypt(pt, ct, fr, ctr)) != CRYPT_OK) {
+          return err;
+       }
+       pt += fr;
+       ct += fr;
+       len -= fr;
+     }
+
+     if (len >= (unsigned long)ctr->blocklen) {
+       if ((err = cipher_descriptor[ctr->cipher].accel_ctr_encrypt(pt, ct, len/ctr->blocklen, ctr->ctr, ctr->mode, &ctr->key)) != CRYPT_OK) {
+          return err;
+       }
+       pt += (len / ctr->blocklen) * ctr->blocklen;
+       ct += (len / ctr->blocklen) * ctr->blocklen;
+       len %= ctr->blocklen;
+     }
+   }
+
+   return _ctr_encrypt(pt, ct, len, ctr);
+}
+
 #endif
 
 /* ref:         $Format:%D$ */

libtomcrypt/src/pk/asn1/der/sequence/der_decode_sequence_flexi.c

@@ -79,8 +79,8 @@ static int _new_element(ltc_asn1_list **l)
 */
 int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc_asn1_list **out)
 {
-   ltc_asn1_list *l;
-   unsigned long err, type, len, totlen, data_offset;
+   ltc_asn1_list *l, *t;
+   unsigned long err, type, len, totlen, data_offset, len_len;
    void          *realloc_tmp;
 
    LTC_ARGCHK(in    != NULL);
@@ -407,6 +407,17 @@ int der_decode_sequence_flexi(const unsigned char *in, unsigned long *inlen, ltc
                 l->child->parent = l;
              }
 
+             t = l;
+             len_len = 0;
+             while((t != NULL) && (t->child != NULL)) {
+                len_len++;
+                t = t->child;
+             }
+             if (len_len > LTC_DER_MAX_RECURSION) {
+                err = CRYPT_ERROR;
+                goto error;
+             }
+
              break;
 
          case 0x80: /* Context-specific */

libtomcrypt/src/pk/asn1/der/sequence/der_decode_subject_public_key_info.c

@@ -80,7 +80,7 @@ int der_decode_subject_public_key_info(const unsigned char *in, unsigned long in
    }
 
    if ((alg_id[0].size != oid.OIDlen) ||
-        XMEMCMP(oid.OID, alg_id[0].data, oid.OIDlen * sizeof(oid.OID[0]))) {
+        XMEMCMP(oid.OID, alg_id[0].data, oid.OIDlen * sizeof(oid.OID[0])) != 0) {
         /* OID mismatch */
         err = CRYPT_PK_INVALID_TYPE;
         goto LBL_ERR;

libtomcrypt/src/pk/dsa/dsa_export.c

@@ -69,7 +69,7 @@ int dsa_export(unsigned char *out, unsigned long *outlen, int type, dsa_key *key
       }
    } else {
       if (std) {
-          unsigned long tmplen = (mp_count_bits(key->y) / 8) + 8;
+          unsigned long tmplen = (unsigned long)(mp_count_bits(key->y) / 8) + 8;
           unsigned char* tmp = XMALLOC(tmplen);
           ltc_asn1_list int_list[3];