Reduce sk specific code

The application id can be stored in signkey, then we don't need
to call sk-specific functions from svr-authpubkey

.github/multiwrapper

@@ -1,9 +0,0 @@
-#!/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

@@ -1,25 +0,0 @@
-# Checks that autoconf has been run if configure.ac was updated
-# Assumes that autoconf 2.69 was run, the same as ubuntu 20.04
-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@v2
-
-      - name: run autoconf
-        run: autoconf && autoheader
-
-      - name: check no difference
-        run: git diff --exit-code

.github/workflows/build.yml

@@ -1,5 +1,4 @@
 # Can be used locally with https://github.com/nektos/act
-# Note the XXX line below.
 
 name: BuildTest
 on:
@@ -9,12 +8,9 @@ on:
       - master
 jobs:
   build:
-    runs-on: ${{ matrix.os || 'ubuntu-22.04' }}
+    runs-on: ${{ matrix.os || 'ubuntu-20.04' }}
     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
@@ -26,19 +22,6 @@ jobs:
 
           - 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
@@ -52,18 +35,11 @@ jobs:
           - 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
-
-          - name: macos 12
-            os: macos-12
+          - name: macos 10.15
+            os: macos-10.15
             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
+            # OS X says daemon() and utmp are deprecated
+            extracflags: -Wno-deprecated-declarations
             runcheck: 'no'
             apt: 'no'
             # fails with:
@@ -73,65 +49,17 @@ jobs:
           - name: macos 11
             os: macos-11
             cc: clang
-            extracflags: -Wno-deprecated-declarations -Wno-undef
+            extracflags: -Wno-deprecated-declarations
             runcheck: 'no'
             apt: 'no'
             ranlib: ranlib -no_warning_for_no_symbols
 
-          # Check that debug code doesn't bitrot
-          - name: DEBUG_TRACE
-            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
-
           # # 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
 
@@ -141,7 +69,6 @@ jobs:
           #   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
 
@@ -151,22 +78,16 @@ jobs:
       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
+          sudo apt-get -y install zlib1g-dev libtomcrypt-dev libtommath-dev mercurial python3-venv $CC
 
       - uses: actions/checkout@v2
 
@@ -177,37 +98,13 @@ jobs:
         if: ${{ matrix.nowritev }}
         run: sed -i -e s/HAVE_WRITEV/DONT_HAVE_WRITEV/ config.h
 
-      - name: localoptions
-        run: |
-          echo "$LOCALOPTIONS" > localoptions.h
-          echo "#define DROPBEAR_DSS 1" >> localoptions.h
-          cat localoptions.h
-
-      - name: nondefault
-        if: ${{ matrix.nondefault }}
-        run: |
-          # Turn on anything that's off by default. Rough but seems sufficient
-          grep ' 0$' 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: make -j3 $MAKE_TARGET
+        run: make -j3
 
       - name: multilink
-        if: ${{ matrix.multilink }}
+        if: ${{ matrix.multi }}
         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 }}
@@ -217,17 +114,9 @@ jobs:
         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
 
@@ -245,22 +134,16 @@ jobs:
 
       # Sanity check that the binary runs
       - name: genrsa
-        if: ${{ matrix.runcheck != 'no' }}
         run: ~/inst/bin/dropbearkey -t rsa -f testrsa
       - name: gendss
-        if: ${{ matrix.runcheck != 'no' }}
         run: ~/inst/bin/dropbearkey -t dss -f testdss
       - 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

.github/workflows/tarball.yml

@@ -1,36 +0,0 @@
-name: tarball sha256sum
-on:
-  push:
-    branches:
-      - master
-jobs:
-  tarball:
-    runs-on: 'ubuntu-22.04'
-
-    steps:
-      - uses: actions/checkout@v2
-
-      - name: release.sh
-        run: ./release.sh --testrel | tee log1.txt
-
-      - name: extract output
-        run: |
-          grep ^SHA256 log1.txt > sha256sum.txt
-          sed 's/.*= *//' < sha256sum.txt > hash.txt
-          mv `tail -n1 log1.txt` rel.tar.bz2
-
-      - name: sha256sum
-        uses: actions/upload-artifact@v3
-        with:
-          name: sha256sum
-          path: |
-            sha256sum.txt
-            hash.txt
-
-      - name: tarball
-        uses: actions/upload-artifact@v3
-        with:
-          name: tarball
-          # only keep for debugging
-          retention-days: 3
-          path: rel.tar.bz2

.gitignore

@@ -19,10 +19,9 @@
 /fuzzer-*.options
 /scp
 /scp-progress
+Makefile
 config.h
 default_options_guard.h
-localoptions.h
-Makefile
 tags
 .pytest*
 *.pyc

CHANGES

@@ -1,243 +1,3 @@
-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 

INSTALL

@@ -58,7 +58,7 @@ 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
+you should remove unneeded ciphers and MD5, by editing localoptions.h
 
 It is possible to compile zlib in, by copying zlib.h and zconf.h into a
 subdirectory (ie zlibincludes), and 

Makefile.in

@@ -20,13 +20,13 @@ LIBTOM_LIBS=@LIBTOM_LIBS@
 ifeq (@BUNDLED_LIBTOM@, 1)
 LIBTOM_DEPS=$(STATIC_LTC) $(STATIC_LTM) 
 LIBTOM_CLEAN=ltc-clean ltm-clean
-CPPFLAGS+=-I$(srcdir)/libtomcrypt/src/headers/
+CFLAGS+=-I$(srcdir)/libtomcrypt/src/headers/
 LIBTOM_LIBS=$(STATIC_LTC) $(STATIC_LTM)
 endif
 
 OPTION_HEADERS = default_options_guard.h sysoptions.h
 ifneq ($(wildcard localoptions.h),)
-CPPFLAGS+=-DLOCALOPTIONS_H_EXISTS
+CFLAGS+=-DLOCALOPTIONS_H_EXISTS
 OPTION_HEADERS += localoptions.h
 endif
 
@@ -57,7 +57,7 @@ CLISVROBJS=common-session.o packet.o common-algo.o common-kex.o \
 
 KEYOBJS=dropbearkey.o
 
-CONVERTOBJS=dropbearconvert.o keyimport.o signkey_ossh.o
+CONVERTOBJS=dropbearconvert.o keyimport.o
 
 SCPOBJS=scp.o progressmeter.o atomicio.o scpmisc.o compat.o
 
@@ -107,8 +107,8 @@ AR=@AR@
 RANLIB=@RANLIB@
 STRIP=@STRIP@
 INSTALL=@INSTALL@
-CPPFLAGS+=@CPPFLAGS@ -I. -I$(srcdir)
-CFLAGS+=@CFLAGS@
+CPPFLAGS=@CPPFLAGS@
+CFLAGS+=-I. -I$(srcdir) $(CPPFLAGS) @CFLAGS@
 LIBS+=@LIBS@
 LDFLAGS=@LDFLAGS@
 
@@ -119,16 +119,15 @@ 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))))
-	CPPFLAGS+= -DDROPBEAR_SERVER
+	CFLAGS+= -DDROPBEAR_SERVER
 endif
 ifneq (,$(strip $(foreach prog, $(PROGRAMS), $(findstring ZdbclientZ, Z$(prog)Z))))
-	CPPFLAGS+= -DDROPBEAR_CLIENT
+	CFLAGS+= -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)
@@ -143,7 +142,7 @@ endif
 
 # for the scp progress meter. The -D doesn't affect anything else.
 ifeq ($(SCPPROGRESS), 1)
-	CPPFLAGS+=-DPROGRESS_METER
+	CFLAGS+=-DPROGRESS_METER
 endif
 
 all: $(TARGETS)
@@ -217,7 +216,7 @@ scp: $(SCPOBJS)  $(HEADERS) Makefile
 MULTIOBJS=
 ifeq ($(MULTI),1)
 	MULTIOBJS=dbmulti.o $(sort $(foreach prog, $(PROGRAMS), $($(prog)objs)))
-	CPPFLAGS+=$(addprefix -DDBMULTI_, $(PROGRAMS)) -DDROPBEAR_MULTI
+	CFLAGS+=$(addprefix -DDBMULTI_, $(PROGRAMS)) -DDROPBEAR_MULTI
 endif
 
 dropbearmulti$(EXEEXT): $(HEADERS) $(MULTIOBJS) $(LIBTOM_DEPS) Makefile

README

@@ -8,8 +8,6 @@ which performs multiple tasks, to save disk space)
 
 SMALL 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 http://lists.ucc.gu.uwa.edu.au/mailman/listinfo/dropbear
 

SMALL

@@ -9,7 +9,10 @@ The same applies if you are compiling just a client.
 
 ---
 
-The following are set in localoptions.h:
+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
 
@@ -47,10 +50,4 @@ deciding.
 
 Of course using small C libraries such as uClibc and dietlibc 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.

auth.h

@@ -28,7 +28,6 @@
 #include "includes.h"
 #include "signkey.h"
 #include "chansession.h"
-#include "list.h"
 
 void svr_authinitialise(void);
 
@@ -46,7 +45,6 @@ int svr_pubkey_allows_agentfwd(void);
 int svr_pubkey_allows_tcpfwd(void);
 int svr_pubkey_allows_x11fwd(void);
 int svr_pubkey_allows_pty(void);
-int svr_pubkey_allows_local_tcpfwd(const char *host, unsigned int port);
 void svr_pubkey_set_forced_command(struct ChanSess *chansess);
 void svr_pubkey_options_cleanup(void);
 int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filename);
@@ -56,9 +54,6 @@ int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filena
 #define svr_pubkey_allows_tcpfwd() 1
 #define svr_pubkey_allows_x11fwd() 1
 #define svr_pubkey_allows_pty() 1
-static inline int svr_pubkey_allows_local_tcpfwd(const char *host, unsigned int port)
-	{ (void)host; (void)port; return 1; }
-
 static inline void svr_pubkey_set_forced_command(struct ChanSess *chansess) { }
 static inline void svr_pubkey_options_cleanup(void) { }
 #define svr_add_pubkey_options(x,y,z) DROPBEAR_SUCCESS
@@ -98,7 +93,6 @@ void cli_auth_pubkey_cleanup(void);
 #define AUTH_METHOD_INTERACT "keyboard-interactive"
 #define AUTH_METHOD_INTERACT_LEN 20
 
-#define PUBKEY_OPTIONS_ANY_PORT UINT_MAX
 
 
 /* This structure is shared between server and client - it contains
@@ -131,7 +125,6 @@ struct AuthState {
 	char *pw_passwd;
 #if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 	struct PubKeyOptions* pubkey_options;
-	char *pubkey_info;
 #endif
 };
 
@@ -145,18 +138,6 @@ struct PubKeyOptions {
 	int no_pty_flag;
 	/* "command=" option. */
 	char * forced_command;
-	/* "permitopen=" option */
-	m_list *permit_open_destinations;
-	
-#if DROPBEAR_SK_ECDSA || DROPBEAR_SK_ED25519
-	int no_touch_required_flag;
-	int verify_required_flag;
-#endif
-};
-
-struct PermitTCPFwdEntry {
-	char *host;
-	unsigned int port;
 };
 #endif
 

bignum.c

@@ -93,12 +93,12 @@ void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len) {
 
 /* hash the ssh representation of the mp_int mp */
 void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, 
-				hash_state *hs, const mp_int *mp) {
+				hash_state *hs, mp_int *mp) {
 	buffer * buf;
 
 	buf = buf_new(512 + 20); /* max buffer is a 4096 bit key, 
 								plus header + some leeway*/
 	buf_putmpint(buf, mp);
 	hash_desc->process(hs, buf->data, buf->len);
-	buf_burn_free(buf);
+	buf_free(buf);
 }

bignum.h

@@ -33,6 +33,6 @@ void m_mp_alloc_init_multi(mp_int **mp, ...) ATTRIB_SENTINEL;
 void m_mp_free_multi(mp_int **mp, ...)  ATTRIB_SENTINEL;
 void bytes_to_mp(mp_int *mp, const unsigned char* bytes, unsigned int len);
 void hash_process_mp(const struct ltc_hash_descriptor *hash_desc, 
-				hash_state *hs, const mp_int *mp);
+				hash_state *hs, mp_int *mp);
 
 #endif /* DROPBEAR_BIGNUM_H_ */

buffer.c

@@ -55,13 +55,11 @@ void buf_free(buffer* buf) {
 	m_free(buf);
 }
 
-/* overwrite the contents of the buffer then free it */
-void buf_burn_free(buffer* buf) {
+/* overwrite the contents of the buffer to clear it */
+void buf_burn(const buffer* buf) {
 	m_burn(buf->data, buf->size);
-	m_free(buf);
 }
 
-
 /* resize a buffer, pos and len will be repositioned if required when
  * downsizing */
 buffer* buf_resize(buffer *buf, unsigned int newsize) {
@@ -299,7 +297,7 @@ void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len) {
 
 /* for our purposes we only need positive (or 0) numbers, so will
  * fail if we get negative numbers */
-void buf_putmpint(buffer* buf, const mp_int * mp) {
+void buf_putmpint(buffer* buf, mp_int * mp) {
 	size_t written;
 	unsigned int len, pad = 0;
 	TRACE2(("enter buf_putmpint"))

buffer.h

@@ -44,7 +44,7 @@ buffer * buf_new(unsigned int size);
 /* Possibly returns a new buffer*, like realloc() */
 buffer * buf_resize(buffer *buf, unsigned int newsize);
 void buf_free(buffer* buf);
-void buf_burn_free(buffer* buf);
+void buf_burn(const buffer* buf);
 buffer* buf_newcopy(const buffer* buf);
 void buf_setlen(buffer* buf, unsigned int len);
 void buf_incrlen(buffer* buf, unsigned int incr);
@@ -65,7 +65,7 @@ void buf_putint(buffer* buf, unsigned int val);
 void buf_putstring(buffer* buf, const char* str, unsigned int len);
 void buf_putbufstring(buffer *buf, const buffer* buf_str);
 void buf_putbytes(buffer *buf, const unsigned char *bytes, unsigned int len);
-void buf_putmpint(buffer* buf, const mp_int * mp);
+void buf_putmpint(buffer* buf, mp_int * mp);
 int buf_getmpint(buffer* buf, mp_int* mp);
 unsigned int buf_getint(buffer* buf);
 

channel.h

@@ -28,7 +28,6 @@
 #include "includes.h"
 #include "buffer.h"
 #include "circbuffer.h"
-#include "netio.h"
 
 #define SSH_OPEN_ADMINISTRATIVELY_PROHIBITED    1
 #define SSH_OPEN_CONNECT_FAILED                 2
@@ -42,6 +41,13 @@
 
 struct ChanType;
 
+enum dropbear_channel_prio {
+	DROPBEAR_CHANNEL_PRIO_INTERACTIVE, /* pty shell, x11 */
+	DROPBEAR_CHANNEL_PRIO_UNKNOWABLE, /* tcp - can't know what's being forwarded */
+	DROPBEAR_CHANNEL_PRIO_BULK, /* the rest - probably scp or something */
+	DROPBEAR_CHANNEL_PRIO_EARLY, /* channel is still being set up */
+};
+
 struct Channel {
 
 	unsigned int index; /* the local channel index */
@@ -82,7 +88,7 @@ struct Channel {
 
 	const struct ChanType* type;
 
-	enum dropbear_prio prio;
+	enum dropbear_channel_prio prio;
 };
 
 struct ChanType {

cli-auth.c

@@ -82,11 +82,6 @@ void recv_msg_userauth_banner() {
 		return;
 	}
 
-	if (cli_opts.quiet) {
-		TRACE(("not showing banner"))
-		return;
-	}
-
 	banner = buf_getstring(ses.payload, &bannerlen);
 	buf_eatstring(ses.payload); /* The language string */
 
@@ -265,7 +260,7 @@ void recv_msg_userauth_success() {
 	/* This function can validly get called multiple times
 	if DROPBEAR_CLI_IMMEDIATE_AUTH is set */
 
-	DEBUG1(("received msg_userauth_success"))
+	TRACE(("received msg_userauth_success"))
 	if (cli_opts.disable_trivial_auth && cli_ses.is_trivial_auth) {
 		dropbear_exit("trivial authentication not allowed");
 	}
@@ -296,6 +291,18 @@ int cli_auth_try() {
 	}
 #endif
 
+#if DROPBEAR_CLI_PASSWORD_AUTH
+	if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
+		if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
+			fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
+		} else {
+			cli_auth_password();
+			finished = 1;
+			cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
+		}
+	}
+#endif
+
 #if DROPBEAR_CLI_INTERACT_AUTH
 	if (!finished && (ses.authstate.authtypes & AUTH_TYPE_INTERACT)) {
 		if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
@@ -310,18 +317,6 @@ int cli_auth_try() {
 	}
 #endif
 
-#if DROPBEAR_CLI_PASSWORD_AUTH
-	if (!finished && (ses.authstate.authtypes & AUTH_TYPE_PASSWORD)) {
-		if (ses.keys->trans.algo_crypt->cipherdesc == NULL) {
-			fprintf(stderr, "Sorry, I won't let you use password auth unencrypted.\n");
-		} else {
-			cli_auth_password();
-			finished = 1;
-			cli_ses.lastauthtype = AUTH_TYPE_PASSWORD;
-		}
-	}
-#endif
-
 	TRACE(("cli_auth_try lastauthtype %d", cli_ses.lastauthtype))
 
 	if (finished) {

cli-authinteract.c

@@ -114,8 +114,8 @@ void recv_msg_userauth_info_request() {
 	m_free(instruction);
 
 	for (i = 0; i < num_prompts; i++) {
-		unsigned int response_len = 0;
 		cli_ses.is_trivial_auth = 0;
+		unsigned int response_len = 0;
 		prompt = buf_getstring(ses.payload, NULL);
 		cleantext(prompt);
 

cli-authpasswd.c

@@ -120,7 +120,7 @@ void cli_auth_password() {
 	char* password = NULL;
 	char prompt[80];
 
-	DEBUG1(("enter cli_auth_password"))
+	TRACE(("enter cli_auth_password"))
 	CHECKCLEARTOWRITE();
 
 	snprintf(prompt, sizeof(prompt), "%s@%s's password: ", 

cli-authpubkey.c

@@ -147,7 +147,7 @@ static void send_msg_userauth_pubkey(sign_key *key, enum signature_type sigtype,
 	buffer* sigbuf = NULL;
 	enum signkey_type keytype = signkey_type_from_signature(sigtype);
 
-	DEBUG1(("enter send_msg_userauth_pubkey %s", signature_name_from_type(sigtype, NULL)))
+	TRACE(("enter send_msg_userauth_pubkey sigtype %d", sigtype))
 	CHECKCLEARTOWRITE();
 
 	buf_putbyte(ses.writepayload, SSH_MSG_USERAUTH_REQUEST);

cli-chansession.c

@@ -348,6 +348,7 @@ static int cli_init_stdpipe_sess(struct Channel *channel) {
 }
 
 static int cli_init_netcat(struct Channel *channel) {
+	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
 	return cli_init_stdpipe_sess(channel);
 }
 
@@ -360,9 +361,12 @@ static int cli_initchansess(struct Channel *channel) {
 		cli_setup_agent(channel);
 	}
 #endif
+
 	if (cli_opts.wantpty) {
 		send_chansess_pty_req(channel);
-		channel->prio = DROPBEAR_PRIO_LOWDELAY;
+		channel->prio = DROPBEAR_CHANNEL_PRIO_INTERACTIVE;
+	} else {
+		channel->prio = DROPBEAR_CHANNEL_PRIO_BULK;
 	}
 
 	send_chansess_shell_req(channel);
@@ -371,7 +375,7 @@ static int cli_initchansess(struct Channel *channel) {
 		cli_tty_setup();
 		channel->read_mangler = cli_escape_handler;
 		cli_ses.last_char = '\r';
-	}
+	}	
 
 	return 0; /* Success */
 }

cli-kex.c

@@ -229,8 +229,6 @@ static void ask_to_confirm(const unsigned char* keyblob, unsigned int keybloblen
 		fclose(tty);
 	} else {
 		response = getc(stdin);
-		/* flush stdin buffer */
-		while ((getchar()) != '\n');
 	}
 
 	if (response == 'y') {
@@ -373,7 +371,7 @@ static void checkhostkey(const unsigned char* keyblob, unsigned int keybloblen)
 
 		if (ret == DROPBEAR_SUCCESS) {
 			/* Good matching key */
-			DEBUG1(("server match %s", fingerprint))
+			TRACE(("good matching key"))
 			goto out;
 		}
 

cli-main.c

@@ -65,12 +65,8 @@ int main(int argc, char ** argv) {
 	}
 #endif
 
-        if (cli_opts.bind_address) {
-		DEBUG1(("connect to: user=%s host=%s/%s bind_address=%s:%s", cli_opts.username,
-			cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address, cli_opts.bind_port))
-	} else {
-		DEBUG1(("connect to: user=%s host=%s/%s",cli_opts.username,cli_opts.remotehost,cli_opts.remoteport))
-	}
+	TRACE(("user='%s' host='%s' port='%s' bind_address='%s' bind_port='%s'", cli_opts.username,
+				cli_opts.remotehost, cli_opts.remoteport, cli_opts.bind_address, cli_opts.bind_port))
 
 	if (signal(SIGPIPE, SIG_IGN) == SIG_ERR) {
 		dropbear_exit("signal() error");
@@ -88,9 +84,8 @@ int main(int argc, char ** argv) {
 	} else
 #endif
 	{
-		progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport,
-			cli_connected, &ses, cli_opts.bind_address, cli_opts.bind_port,
-			DROPBEAR_PRIO_LOWDELAY);
+		progress = connect_remote(cli_opts.remotehost, cli_opts.remoteport, 
+			cli_connected, &ses, cli_opts.bind_address, cli_opts.bind_port);
 		sock_in = sock_out = -1;
 	}
 
@@ -139,7 +134,6 @@ static void cli_proxy_cmd(int *sock_in, int *sock_out, pid_t *pid_out) {
 
 	ret = spawn_command(exec_proxy_cmd, ex_cmd,
 			sock_out, sock_in, NULL, pid_out);
-	DEBUG1(("cmd: %s  pid=%d", ex_cmd,*pid_out))
 	m_free(ex_cmd);
 	if (ret == DROPBEAR_FAILURE) {
 		dropbear_exit("Failed running proxy command");

cli-runopts.c

@@ -62,7 +62,6 @@ static void printhelp() {
 					"-T    Don't allocate a pty\n"
 					"-N    Don't run a remote command\n"
 					"-f    Run in background after auth\n"
-					"-q    quiet, don't show remote banner\n"
 					"-y    Always accept remote host key if unknown\n"
 					"-y -y Don't perform any remote host key checking (caution)\n"
 					"-s    Request a subsystem (use by external sftp)\n"
@@ -83,7 +82,6 @@ static void printhelp() {
 					"-W <receive_window_buffer> (default %d, larger may be faster, max 10MB)\n"
 					"-K <keepalive>  (0 is never, default %d)\n"
 					"-I <idle_timeout>  (0 is never, default %d)\n"
-					"-z    disable QoS\n"
 #if DROPBEAR_CLI_NETCAT
 					"-B <endhost:endport> Netcat-alike forwarding\n"
 #endif				
@@ -97,7 +95,7 @@ static void printhelp() {
 					"-b    [bind_address][:bind_port]\n"
 					"-V    Version\n"
 #if DEBUG_TRACE
-					"-v    verbose (repeat for more verbose)\n"
+					"-v    verbose (compiled with DEBUG_TRACE)\n"
 #endif
 					,DROPBEAR_VERSION, cli_opts.progname,
 #if DROPBEAR_CLI_PUBKEY_AUTH
@@ -143,7 +141,6 @@ void cli_getopts(int argc, char ** argv) {
 	cli_opts.username = NULL;
 	cli_opts.cmd = NULL;
 	cli_opts.no_cmd = 0;
-	cli_opts.quiet = 0;
 	cli_opts.backgrounded = 0;
 	cli_opts.wantpty = 9; /* 9 means "it hasn't been touched", gets set later */
 	cli_opts.always_accept_key = 0;
@@ -217,9 +214,6 @@ void cli_getopts(int argc, char ** argv) {
 					}
 					cli_opts.always_accept_key = 1;
 					break;
-				case 'q': /* quiet */
-					cli_opts.quiet = 1;
-					break;
 				case 'p': /* remoteport */
 					next = (char**)&cli_opts.remoteport;
 					break;
@@ -303,7 +297,7 @@ void cli_getopts(int argc, char ** argv) {
 #endif
 #if DEBUG_TRACE
 				case 'v':
-					debug_trace++;
+					debug_trace = 1;
 					break;
 #endif
 				case 'F':
@@ -326,9 +320,6 @@ void cli_getopts(int argc, char ** argv) {
 				case 'b':
 					next = &bind_arg;
 					break;
-				case 'z':
-					opts.disable_ip_tos = 1;
-					break;
 				default:
 					fprintf(stderr,
 						"WARNING: Ignoring unknown option -%c\n", c);
@@ -423,7 +414,7 @@ void cli_getopts(int argc, char ** argv) {
 
 	/* And now a few sanity checks and setup */
 
-#if DROPBEAR_CLI_PROXYCMD
+#if DROPBEAR_CLI_PROXYCMD                                                                                                                                   
 	if (cli_opts.proxycmd) {
 		/* To match the common path of m_freeing it */
 		cli_opts.proxycmd = m_strdup(cli_opts.proxycmd);
@@ -435,10 +426,14 @@ void cli_getopts(int argc, char ** argv) {
 	}
 
 	if (bind_arg) {
-		if (split_address_port(bind_arg,
-			&cli_opts.bind_address, &cli_opts.bind_port)
-				== DROPBEAR_FAILURE) {
-			dropbear_exit("Bad -b argument");
+		/* split [host][:port] */
+		char *port = strrchr(bind_arg, ':');
+		if (port) {
+			cli_opts.bind_port = m_strdup(port+1);
+			*port = '\0';
+		}
+		if (strlen(bind_arg) > 0) {
+			cli_opts.bind_address = m_strdup(bind_arg);
 		}
 	}
 
@@ -482,17 +477,6 @@ void cli_getopts(int argc, char ** argv) {
 	}
 #endif
 
-	/* The hostname gets set up last, since
-	 * in multi-hop mode it will require knowledge
-	 * of other flags such as -i */
-#if DROPBEAR_CLI_MULTIHOP
-	parse_multihop_hostname(host_arg, argv[0]);
-#else
-	parse_hostname(host_arg);
-#endif
-
-	/* We don't want to include default id_dropbear as a
-	   -i argument for multihop, so handle it later. */
 #if (DROPBEAR_CLI_PUBKEY_AUTH)
 	{
 		char *expand_path = expand_homedir_path(DROPBEAR_DEFAULT_CLI_AUTHKEY);
@@ -501,6 +485,14 @@ void cli_getopts(int argc, char ** argv) {
 	}
 #endif
 
+	/* The hostname gets set up last, since
+	 * in multi-hop mode it will require knowledge
+	 * of other flags such as -i */
+#if DROPBEAR_CLI_MULTIHOP
+	parse_multihop_hostname(host_arg, argv[0]);
+#else
+	parse_hostname(host_arg);
+#endif
 }
 
 #if DROPBEAR_CLI_PUBKEY_AUTH
@@ -531,11 +523,11 @@ static void loadidentityfile(const char* filename, int warnfail) {
 static char*
 multihop_passthrough_args() {
 	char *ret;
-	unsigned int len, total;
+	int total;
+	unsigned int len = 0;
 	m_list_elem *iter;
 	/* Fill out -i, -y, -W options that make sense for all
 	 * the intermediate processes */
-	len = 30; /* space for "-q -y -y -W <size>\0" */
 #if DROPBEAR_CLI_PUBKEY_AUTH
 	for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
 	{
@@ -543,40 +535,45 @@ multihop_passthrough_args() {
 		len += 3 + strlen(key->filename);
 	}
 #endif /* DROPBEAR_CLI_PUBKEY_AUTH */
-	if (cli_opts.proxycmd) {
-		/* "-J 'cmd'" */
-		len += 6 + strlen(cli_opts.proxycmd);
-	}
 
+	len += 30; /* space for -W <size>, terminator. */
 	ret = m_malloc(len);
 	total = 0;
 
-	if (cli_opts.quiet) {
-		total += m_snprintf(ret+total, len-total, "-q ");
+	if (cli_opts.no_hostkey_check)
+	{
+		int written = snprintf(ret+total, len-total, "-y -y ");
+		total += written;
+	}
+	else if (cli_opts.always_accept_key)
+	{
+		int written = snprintf(ret+total, len-total, "-y ");
+		total += written;
 	}
 
-	if (cli_opts.no_hostkey_check) {
-		total += m_snprintf(ret+total, len-total, "-y -y ");
-	} else if (cli_opts.always_accept_key) {
-		total += m_snprintf(ret+total, len-total, "-y ");
-	}
-
-	if (cli_opts.proxycmd) {
-		total += m_snprintf(ret+total, len-total, "-J '%s' ", cli_opts.proxycmd);
-	}
-
-	if (opts.recv_window != DEFAULT_RECV_WINDOW) {
-		total += m_snprintf(ret+total, len-total, "-W %u ", opts.recv_window);
+	if (opts.recv_window != DEFAULT_RECV_WINDOW)
+	{
+		int written = snprintf(ret+total, len-total, "-W %u ", opts.recv_window);
+		total += written;
 	}
 
 #if DROPBEAR_CLI_PUBKEY_AUTH
 	for (iter = cli_opts.privkeys->first; iter; iter = iter->next)
 	{
 		sign_key * key = (sign_key*)iter->item;
-		total += m_snprintf(ret+total, len-total, "-i %s ", key->filename);
+		const size_t size = len - total;
+		int written = snprintf(ret+total, size, "-i %s ", key->filename);
+		dropbear_assert((unsigned int)written < size);
+		total += written;
 	}
 #endif /* DROPBEAR_CLI_PUBKEY_AUTH */
 
+	/* if args were passed, total will be not zero, and it will have a space at the end, so remove that */
+	if (total > 0) 
+	{
+		total--;
+	}
+
 	return ret;
 }
 
@@ -590,9 +587,6 @@ multihop_passthrough_args() {
  *   dbclient -J "dbclient -B madako:22 wrt" madako
  * etc for as many hosts as we want.
  *
- * Note that "-J" arguments aren't actually used, instead
- * below sets cli_opts.proxycmd directly.
- *
  * Ports for hosts can be specified as host/port.
  */
 static void parse_multihop_hostname(const char* orighostarg, const char* argv0) {
@@ -611,7 +605,7 @@ static void parse_multihop_hostname(const char* orighostarg, const char* argv0)
 			&& strchr(cli_opts.username, '@')) {
 		unsigned int len = strlen(orighostarg) + strlen(cli_opts.username) + 2;
 		hostbuf = m_malloc(len);
-		m_snprintf(hostbuf, len, "%s@%s", cli_opts.username, orighostarg);
+		snprintf(hostbuf, len, "%s@%s", cli_opts.username, orighostarg);
 	} else {
 		hostbuf = m_strdup(orighostarg);
 	}
@@ -634,18 +628,19 @@ static void parse_multihop_hostname(const char* orighostarg, const char* argv0)
 		/* Set up the proxycmd */
 		unsigned int cmd_len = 0;
 		char *passthrough_args = multihop_passthrough_args();
+		if (cli_opts.proxycmd) {
+			dropbear_exit("-J can't be used with multihop mode");
+		}
 		if (cli_opts.remoteport == NULL) {
 			cli_opts.remoteport = "22";
 		}
-		cmd_len = strlen(argv0) + strlen(remainder)
+		cmd_len = strlen(argv0) + strlen(remainder) 
 			+ strlen(cli_opts.remotehost) + strlen(cli_opts.remoteport)
 			+ strlen(passthrough_args)
 			+ 30;
-		/* replace proxycmd. old -J arguments have been copied
-		   to passthrough_args */
-		cli_opts.proxycmd = m_realloc(cli_opts.proxycmd, cmd_len);
-		m_snprintf(cli_opts.proxycmd, cmd_len, "%s -B %s:%s %s %s",
-				argv0, cli_opts.remotehost, cli_opts.remoteport,
+		cli_opts.proxycmd = m_malloc(cmd_len);
+		snprintf(cli_opts.proxycmd, cmd_len, "%s -B %s:%s %s %s", 
+				argv0, cli_opts.remotehost, cli_opts.remoteport, 
 				passthrough_args, remainder);
 #ifndef DISABLE_ZLIB
 		/* The stream will be incompressible since it's encrypted. */

cli-session.c

@@ -102,9 +102,6 @@ void cli_connected(int result, int sock, void* userdata, const char *errstring)
 		dropbear_exit("Connect failed: %s", errstring);
 	}
 	myses->sock_in = myses->sock_out = sock;
-	DEBUG1(("cli_connected"))
-	ses.socket_prio = DROPBEAR_PRIO_NORMAL;
-	/* switches to lowdelay */
 	update_channel_prio();
 }
 

cli-tcpfwd.c

@@ -51,7 +51,7 @@ static int cli_localtcp(const char* listenaddr,
 		unsigned int remoteport);
 static const struct ChanType cli_chan_tcplocal = {
 	"direct-tcpip",
-	NULL,
+	tcp_prio_inithandler,
 	NULL,
 	NULL,
 	NULL,
@@ -272,9 +272,10 @@ static int newtcpforwarded(struct Channel * channel) {
 		goto out;
 	}
 
+	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
+
 	snprintf(portstring, sizeof(portstring), "%u", fwd->connectport);
-	channel->conn_pending = connect_remote(fwd->connectaddr, portstring, channel_connect_done,
-		channel, NULL, NULL, DROPBEAR_PRIO_NORMAL);
+	channel->conn_pending = connect_remote(fwd->connectaddr, portstring, channel_connect_done, channel, NULL, NULL);
 
 	err = SSH_OPEN_IN_PROGRESS;
 

common-algo.c

@@ -64,6 +64,14 @@ static const struct dropbear_cipher dropbear_aes256 =
 static const struct dropbear_cipher dropbear_aes128 = 
 	{&aes_desc, 16, 16};
 #endif
+#if DROPBEAR_TWOFISH256
+static const struct dropbear_cipher dropbear_twofish256 = 
+	{&twofish_desc, 32, 16};
+#endif
+#if DROPBEAR_TWOFISH128
+static const struct dropbear_cipher dropbear_twofish128 = 
+	{&twofish_desc, 16, 16};
+#endif
 #if DROPBEAR_3DES
 static const struct dropbear_cipher dropbear_3des = 
 	{&des3_desc, 24, 8};
@@ -114,6 +122,10 @@ static const struct dropbear_hash dropbear_sha2_256 =
 static const struct dropbear_hash dropbear_sha2_512 =
 	{&sha512_desc, 64, 64};
 #endif
+#if DROPBEAR_MD5_HMAC
+static const struct dropbear_hash dropbear_md5 = 
+	{&md5_desc, 16, 16};
+#endif
 
 const struct dropbear_hash dropbear_nohash =
 	{NULL, 16, 0}; /* used initially */
@@ -144,6 +156,15 @@ algo_type sshciphers[] = {
 #if DROPBEAR_AES256
 	{"aes256-ctr", 0, &dropbear_aes256, 1, &dropbear_mode_ctr},
 #endif
+#if DROPBEAR_TWOFISH_CTR
+/* twofish ctr is conditional as it hasn't been tested for interoperability, see options.h */
+#if DROPBEAR_TWOFISH256
+	{"twofish256-ctr", 0, &dropbear_twofish256, 1, &dropbear_mode_ctr},
+#endif
+#if DROPBEAR_TWOFISH128
+	{"twofish128-ctr", 0, &dropbear_twofish128, 1, &dropbear_mode_ctr},
+#endif
+#endif /* DROPBEAR_TWOFISH_CTR */
 #endif /* DROPBEAR_ENABLE_CTR_MODE */
 
 #if DROPBEAR_ENABLE_CBC_MODE
@@ -153,6 +174,13 @@ algo_type sshciphers[] = {
 #if DROPBEAR_AES256
 	{"aes256-cbc", 0, &dropbear_aes256, 1, &dropbear_mode_cbc},
 #endif
+#if DROPBEAR_TWOFISH256
+	{"twofish256-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
+	{"twofish-cbc", 0, &dropbear_twofish256, 1, &dropbear_mode_cbc},
+#endif
+#if DROPBEAR_TWOFISH128
+	{"twofish128-cbc", 0, &dropbear_twofish128, 1, &dropbear_mode_cbc},
+#endif
 #endif /* DROPBEAR_ENABLE_CBC_MODE */
 
 #if DROPBEAR_3DES
@@ -181,6 +209,9 @@ algo_type sshhashes[] = {
 #endif
 #if DROPBEAR_SHA2_512_HMAC
 	{"hmac-sha2-512", 0, &dropbear_sha2_512, 1, NULL},
+#endif
+#if DROPBEAR_MD5_HMAC
+	{"hmac-md5", 0, (void*)&dropbear_md5, 1, NULL},
 #endif
 	{NULL, 0, NULL, 0, NULL}
 };
@@ -334,7 +365,7 @@ void buf_put_algolist_all(buffer * buf, const algo_type localalgos[], int useall
 	len = buf->pos - startpos - 4;
 	buf_setpos(buf, startpos);
 	buf_putint(buf, len);
-	TRACE(("algolist add %d '%.*s'", len, len, buf_getptr(buf, len)))
+	TRACE(("algolist add %d '%*s'", len, len, buf_getptr(buf, len)))
 	buf_incrwritepos(buf, len);
 }
 
@@ -438,7 +469,7 @@ algo_type * buf_match_algo(buffer* buf, algo_type localalgos[],
 
 	/* get the comma-separated list from the buffer ie "algo1,algo2,algo3" */
 	algolist = buf_getstring(buf, &len);
-	DEBUG3(("buf_match_algo: %s", algolist))
+	TRACE(("buf_match_algo: %s", algolist))
 	remotecount = MAX_PROPOSED_ALGO;
 	get_algolist(algolist, len, remotenames, &remotecount);
 

common-channel.c

@@ -162,7 +162,7 @@ static struct Channel* newchannel(unsigned int remotechan,
 	newchan->recvdonelen = 0;
 	newchan->recvmaxpacket = RECV_MAX_CHANNEL_DATA_LEN;
 
-	newchan->prio = DROPBEAR_PRIO_NORMAL;
+	newchan->prio = DROPBEAR_CHANNEL_PRIO_EARLY; /* inithandler sets it */
 
 	ses.channels[i] = newchan;
 	ses.chancount++;
@@ -955,7 +955,9 @@ void recv_msg_channel_open() {
 		}
 	}
 
-	update_channel_prio();
+	if (channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
+		channel->prio = DROPBEAR_CHANNEL_PRIO_BULK;
+	}
 
 	/* success */
 	send_msg_channel_open_confirmation(channel, channel->recvwindow,
@@ -968,6 +970,8 @@ failure:
 
 cleanup:
 	m_free(type);
+	
+	update_channel_prio();
 
 	TRACE(("leave recv_msg_channel_open"))
 }
@@ -1162,8 +1166,11 @@ void recv_msg_channel_open_confirmation() {
 		}
 	}
 
+	if (channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
+		channel->prio = DROPBEAR_CHANNEL_PRIO_BULK;
+	}
 	update_channel_prio();
-
+	
 	TRACE(("leave recv_msg_channel_open_confirmation"))
 }
 

common-kex.c

@@ -249,7 +249,7 @@ static void kexinitialise() {
 /* Helper function for gen_new_keys, creates a hash. It makes a copy of the
  * already initialised hash_state hs, which should already have processed
  * the dh_K and hash, since these are common. X is the letter 'A', 'B' etc.
- * out must have at least min(hash_size, outlen) bytes allocated.
+ * out must have at least min(SHA1_HASH_SIZE, outlen) bytes allocated.
  *
  * See Section 7.2 of rfc4253 (ssh transport) for details */
 static void hashkeys(unsigned char *out, unsigned int outlen, 
@@ -306,7 +306,8 @@ static void gen_new_keys() {
 	mp_clear(ses.dh_K);
 	m_free(ses.dh_K);
 	hash_desc->process(&hs, ses.hash->data, ses.hash->len);
-	buf_burn_free(ses.hash);
+	buf_burn(ses.hash);
+	buf_free(ses.hash);
 	ses.hash = NULL;
 
 	if (IS_DROPBEAR_CLIENT) {
@@ -802,7 +803,8 @@ void finish_kexhashbuf(void) {
 	}
 #endif
 
-	buf_burn_free(ses.kexhashbuf);
+	buf_burn(ses.kexhashbuf);
+	buf_free(ses.kexhashbuf);
 	m_burn(&hs, sizeof(hash_state));
 	ses.kexhashbuf = NULL;
 	
@@ -867,7 +869,7 @@ static void read_kex_algos() {
 		goto error;
 	}
 	TRACE(("kexguess2 %d", kexguess2))
-	DEBUG3(("kex algo %s", algo->name))
+	TRACE(("kex algo %s", algo->name))
 	ses.newkeys->algo_kex = algo->data;
 
 	/* server_host_key_algorithms */
@@ -877,7 +879,7 @@ static void read_kex_algos() {
 		erralgo = "hostkey";
 		goto error;
 	}
-	DEBUG2(("hostkey algo %s", algo->name))
+	TRACE(("signature algo %s", algo->name))
 	ses.newkeys->algo_signature = algo->val;
 	ses.newkeys->algo_hostkey = signkey_type_from_signature(ses.newkeys->algo_signature);
 
@@ -887,7 +889,7 @@ static void read_kex_algos() {
 		erralgo = "enc c->s";
 		goto error;
 	}
-	DEBUG2(("enc  c2s is %s", c2s_cipher_algo->name))
+	TRACE(("enc c2s is  %s", c2s_cipher_algo->name))
 
 	/* encryption_algorithms_server_to_client */
 	s2c_cipher_algo = buf_match_algo(ses.payload, sshciphers, 0, NULL);
@@ -895,7 +897,7 @@ static void read_kex_algos() {
 		erralgo = "enc s->c";
 		goto error;
 	}
-	DEBUG2(("enc  s2c is %s", s2c_cipher_algo->name))
+	TRACE(("enc s2c is  %s", s2c_cipher_algo->name))
 
 	/* mac_algorithms_client_to_server */
 	c2s_hash_algo = buf_match_algo(ses.payload, sshhashes, 0, NULL);
@@ -908,7 +910,7 @@ static void read_kex_algos() {
 		erralgo = "mac c->s";
 		goto error;
 	}
-	DEBUG2(("hmac c2s is %s", c2s_hash_algo ? c2s_hash_algo->name : "<implicit>"))
+	TRACE(("hash c2s is  %s", c2s_hash_algo ? c2s_hash_algo->name : "<implicit>"))
 
 	/* mac_algorithms_server_to_client */
 	s2c_hash_algo = buf_match_algo(ses.payload, sshhashes, 0, NULL);
@@ -921,7 +923,7 @@ static void read_kex_algos() {
 		erralgo = "mac s->c";
 		goto error;
 	}
-	DEBUG2(("hmac s2c is %s", s2c_hash_algo ? s2c_hash_algo->name : "<implicit>"))
+	TRACE(("hash s2c is  %s", s2c_hash_algo ? s2c_hash_algo->name : "<implicit>"))
 
 	/* compression_algorithms_client_to_server */
 	c2s_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, 0, NULL);
@@ -929,7 +931,7 @@ static void read_kex_algos() {
 		erralgo = "comp c->s";
 		goto error;
 	}
-	DEBUG2(("comp c2s is %s", c2s_comp_algo->name))
+	TRACE(("hash c2s is  %s", c2s_comp_algo->name))
 
 	/* compression_algorithms_server_to_client */
 	s2c_comp_algo = buf_match_algo(ses.payload, ses.compress_algos, 0, NULL);
@@ -937,7 +939,7 @@ static void read_kex_algos() {
 		erralgo = "comp s->c";
 		goto error;
 	}
-	DEBUG2(("comp s2c is %s", s2c_comp_algo->name))
+	TRACE(("hash s2c is  %s", s2c_comp_algo->name))
 
 	/* languages_client_to_server */
 	buf_eatstring(ses.payload);

common-runopts.c

@@ -1,19 +1,19 @@
 /*
  * 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
@@ -35,7 +35,7 @@ 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,
+int readhostkey(const char * filename, sign_key * hostkey, 
 	enum signkey_type *type) {
 
 	int ret = DROPBEAR_FAILURE;
@@ -57,7 +57,8 @@ int readhostkey(const char * filename, sign_key * hostkey,
 	ret = DROPBEAR_SUCCESS;
 out:
 
-	buf_burn_free(buf);
+	buf_burn(buf);
+	buf_free(buf);
 	return ret;
 }
 
@@ -117,57 +118,3 @@ void parse_recv_window(const char* recv_window_arg) {
 
 }
 
-/* Splits addr:port. Handles IPv6 [2001:0011::4]:port style format.
-   Returns first/second parts as malloced strings, second will
-   be NULL if no separator is found.
-   :port  ->  (NULL, "port")
-   port  ->   (port, NULL)
-   addr:port  (addr, port)
-   addr: ->   (addr, "")
-   Returns DROPBEAR_SUCCESS/DROPBEAR_FAILURE */
-int split_address_port(const char* spec, char **first, char ** second) {
-	char *spec_copy = NULL, *addr = NULL, *colon = NULL;
-	int ret = DROPBEAR_FAILURE;
-
-	*first = NULL;
-	*second = NULL;
-	spec_copy = m_strdup(spec);
-	addr = spec_copy;
-
-	if (*addr == '[') {
-		addr++;
-		colon = strchr(addr, ']');
-		if (!colon) {
-			dropbear_log(LOG_WARNING, "Bad address '%s'", spec);
-			goto out;
-		}
-		*colon = '\0';
-		colon++;
-		if (*colon == '\0') {
-			/* No port part */
-			colon = NULL;
-		} else if (*colon != ':') {
-			dropbear_log(LOG_WARNING, "Bad address '%s'", spec);
-			goto out;
-		}
-	} else {
-		/* search for ':', that separates address and port */
-		colon = strrchr(addr, ':');
-	}
-
-	/* colon points to ':' now, or is NULL */
-	if (colon) {
-		/* Split the address/port */
-		*colon = '\0';
-		colon++;
-		*second = m_strdup(colon);
-	}
-	if (strlen(addr)) {
-		*first = m_strdup(addr);
-	}
-	ret = DROPBEAR_SUCCESS;
-
-out:
-	m_free(spec_copy);
-	return ret;
-}

common-session.c

@@ -64,7 +64,7 @@ void common_session_init(int sock_in, int sock_out) {
 		setnonblocking(sock_out);
 	}
 
-	ses.socket_prio = DROPBEAR_PRIO_NORMAL;
+	ses.socket_prio = DROPBEAR_PRIO_DEFAULT;
 	/* Sets it to lowdelay */
 	update_channel_prio();
 
@@ -285,7 +285,8 @@ static void cleanup_buf(buffer **buf) {
 	if (!*buf) {
 		return;
 	}
-	buf_burn_free(*buf);
+	buf_burn(*buf);
+	buf_free(*buf);
 	*buf = NULL;
 }
 
@@ -403,7 +404,7 @@ static void read_session_identification() {
 		dropbear_exit("Incompatible remote version '%s'", ses.remoteident);
 	}
 
-	DEBUG1(("remoteident: %s", ses.remoteident))
+	TRACE(("remoteident: %s", ses.remoteident))
 
 }
 
@@ -519,24 +520,15 @@ static void send_msg_keepalive() {
 	ses.last_packet_time_idle = old_time_idle;
 }
 
-/* Returns the difference in seconds, clamped to LONG_MAX */
-static long elapsed(time_t now, time_t prev) {
-	time_t del = now - prev;
-	if (del > LONG_MAX) {
-		return LONG_MAX;
-	}
-	return (long)del;
-}
-
 /* Check all timeouts which are required. Currently these are the time for
  * user authentication, and the automatic rekeying. */
 static void checktimeouts() {
 
 	time_t now;
 	now = monotonic_now();
-
+	
 	if (IS_DROPBEAR_SERVER && ses.connect_time != 0
-		&& elapsed(now, ses.connect_time) >= AUTH_TIMEOUT) {
+		&& now - ses.connect_time >= AUTH_TIMEOUT) {
 			dropbear_close("Timeout before auth");
 	}
 
@@ -546,47 +538,45 @@ static void checktimeouts() {
 	}
 
 	if (!ses.kexstate.sentkexinit
-			&& (elapsed(now, ses.kexstate.lastkextime) >= KEX_REKEY_TIMEOUT
+			&& (now - ses.kexstate.lastkextime >= KEX_REKEY_TIMEOUT
 			|| ses.kexstate.datarecv+ses.kexstate.datatrans >= KEX_REKEY_DATA)) {
 		TRACE(("rekeying after timeout or max data reached"))
 		send_msg_kexinit();
 	}
-
+	
 	if (opts.keepalive_secs > 0 && ses.authstate.authdone) {
 		/* Avoid sending keepalives prior to auth - those are
 		not valid pre-auth packet types */
 
 		/* Send keepalives if we've been idle */
-		if (elapsed(now, ses.last_packet_time_any_sent) >= opts.keepalive_secs) {
+		if (now - ses.last_packet_time_any_sent >= opts.keepalive_secs) {
 			send_msg_keepalive();
 		}
 
 		/* Also send an explicit keepalive message to trigger a response
 		if the remote end hasn't sent us anything */
-		if (elapsed(now, ses.last_packet_time_keepalive_recv) >= opts.keepalive_secs
-			&& elapsed(now, ses.last_packet_time_keepalive_sent) >= opts.keepalive_secs) {
+		if (now - ses.last_packet_time_keepalive_recv >= opts.keepalive_secs
+			&& now - ses.last_packet_time_keepalive_sent >= opts.keepalive_secs) {
 			send_msg_keepalive();
 		}
 
-		if (elapsed(now, ses.last_packet_time_keepalive_recv)
+		if (now - ses.last_packet_time_keepalive_recv 
 			>= opts.keepalive_secs * DEFAULT_KEEPALIVE_LIMIT) {
 			dropbear_exit("Keepalive timeout");
 		}
 	}
 
-	if (opts.idle_timeout_secs > 0
-			&& elapsed(now, ses.last_packet_time_idle) >= opts.idle_timeout_secs) {
+	if (opts.idle_timeout_secs > 0 
+			&& now - ses.last_packet_time_idle >= opts.idle_timeout_secs) {
 		dropbear_close("Idle timeout");
 	}
 }
 
-static void update_timeout(long limit, time_t now, time_t last_event, long * timeout) {
-	TRACE2(("update_timeout limit %ld, now %llu, last %llu, timeout %ld",
-		limit,
-		(unsigned long long)now,
-		(unsigned long long)last_event, *timeout))
+static void update_timeout(long limit, long now, long last_event, long * timeout) {
+	TRACE2(("update_timeout limit %ld, now %ld, last %ld, timeout %ld",
+		limit, now, last_event, *timeout))
 	if (last_event > 0 && limit > 0) {
-		*timeout = MIN(*timeout, elapsed(now, last_event) + limit);
+		*timeout = MIN(*timeout, last_event+limit-now);
 		TRACE2(("new timeout %ld", *timeout))
 	}
 }
@@ -595,7 +585,7 @@ static long select_timeout() {
 	/* determine the minimum timeout that might be required, so
 	as to avoid waking when unneccessary */
 	long timeout = KEX_REKEY_TIMEOUT;
-	time_t now = monotonic_now();
+	long now = monotonic_now();
 
 	if (!ses.kexstate.sentkexinit) {
 		update_timeout(KEX_REKEY_TIMEOUT, now, ses.kexstate.lastkextime, &timeout);
@@ -607,7 +597,7 @@ static long select_timeout() {
 	}
 
 	if (ses.authstate.authdone) {
-		update_timeout(opts.keepalive_secs, now,
+		update_timeout(opts.keepalive_secs, now, 
 			MAX(ses.last_packet_time_keepalive_recv, ses.last_packet_time_keepalive_sent),
 			&timeout);
 	}
@@ -677,16 +667,26 @@ void update_channel_prio() {
 		return;
 	}
 
-	new_prio = DROPBEAR_PRIO_NORMAL;
+	new_prio = DROPBEAR_PRIO_BULK;
 	for (i = 0; i < ses.chansize; i++) {
 		struct Channel *channel = ses.channels[i];
-		if (!channel) {
+		if (!channel || channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
+			if (channel && channel->prio == DROPBEAR_CHANNEL_PRIO_EARLY) {
+				TRACE(("update_channel_prio: early %d", channel->index))
+			}
 			continue;
 		}
 		any = 1;
-		if (channel->prio == DROPBEAR_PRIO_LOWDELAY) {
+		if (channel->prio == DROPBEAR_CHANNEL_PRIO_INTERACTIVE)
+		{
+			TRACE(("update_channel_prio: lowdelay %d", channel->index))
 			new_prio = DROPBEAR_PRIO_LOWDELAY;
 			break;
+		} else if (channel->prio == DROPBEAR_CHANNEL_PRIO_UNKNOWABLE
+			&& new_prio == DROPBEAR_PRIO_BULK)
+		{
+			TRACE(("update_channel_prio: unknowable %d", channel->index))
+			new_prio = DROPBEAR_PRIO_DEFAULT;
 		}
 	}
 

compat.c

@@ -231,7 +231,8 @@ void setusershell() {
 }
 
 static char **initshells() {
-	static const char *okshells[] = { COMPAT_USER_SHELLS, NULL };
+	/* don't touch this list. */
+	static const char *okshells[] = { "/bin/sh", "/bin/csh", NULL };
 	register char **sp, *cp;
 	register FILE *fp;
 	struct stat statb;

config.h.in

@@ -93,9 +93,6 @@
 /* Define to 1 if you have the `explicit_bzero' function. */
 #undef HAVE_EXPLICIT_BZERO
 
-/* Define to 1 if you have the `fexecve' function. */
-#undef HAVE_FEXECVE
-
 /* Define to 1 if you have the `fork' function. */
 #undef HAVE_FORK
 
@@ -180,6 +177,9 @@
 /* Define to 1 if you have the <mach/mach_time.h> header file. */
 #undef HAVE_MACH_MACH_TIME_H
 
+/* Define to 1 if you have the <memory.h> header file. */
+#undef HAVE_MEMORY_H
+
 /* Define to 1 if you have the `memset_s' function. */
 #undef HAVE_MEMSET_S
 
@@ -234,9 +234,6 @@
 /* Define to 1 if you have the <stdint.h> header file. */
 #undef HAVE_STDINT_H
 
-/* Define to 1 if you have the <stdio.h> header file. */
-#undef HAVE_STDIO_H
-
 /* Define to 1 if you have the <stdlib.h> header file. */
 #undef HAVE_STDLIB_H
 
@@ -321,9 +318,6 @@
 /* Define to 1 if `ut_type' is a member of `struct utmp'. */
 #undef HAVE_STRUCT_UTMP_UT_TYPE
 
-/* Define to 1 if you have the <sys/prctl.h> header file. */
-#undef HAVE_SYS_PRCTL_H
-
 /* Define to 1 if you have the <sys/random.h> header file. */
 #undef HAVE_SYS_RANDOM_H
 
@@ -417,14 +411,17 @@
 /* Define to the type of arg 5 for `select'. */
 #undef SELECT_TYPE_ARG5
 
-/* Define to 1 if all of the C90 standard headers exist (not just the ones
-   required in a freestanding environment). This macro is provided for
-   backward compatibility; new code need not use it. */
+/* Define to 1 if you have the ANSI C header files. */
 #undef STDC_HEADERS
 
 /* Use /dev/ptmx */
 #undef USE_DEV_PTMX
 
+/* Enable large inode numbers on Mac OS X 10.5.  */
+#ifndef _DARWIN_USE_64_BIT_INODE
+# define _DARWIN_USE_64_BIT_INODE 1
+#endif
+
 /* Number of bits in a file offset, on hosts where this is settable. */
 #undef _FILE_OFFSET_BITS
 
@@ -443,7 +440,7 @@
 /* Define to `int' if <sys/types.h> does not define. */
 #undef mode_t
 
-/* Define as a signed integer type capable of holding a process identifier. */
+/* Define to `int' if <sys/types.h> does not define. */
 #undef pid_t
 
 /* Define to `unsigned int' if <sys/types.h> does not define. */

config.sub

@@ -1,14 +1,12 @@
 #! /bin/sh
 # Configuration validation subroutine script.
-#   Copyright 1992-2022 Free Software Foundation, Inc.
+#   Copyright 1992-2021 Free Software Foundation, Inc.
 
-# shellcheck disable=SC2006,SC2268 # see below for rationale
-
-timestamp='2022-09-17'
+timestamp='2021-03-10'
 
 # This file is free software; you can redistribute it and/or modify it
 # under the terms of the GNU General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
+# the Free Software Foundation; either version 3 of the License, or
 # (at your option) any later version.
 #
 # This program is distributed in the hope that it will be useful, but
@@ -52,14 +50,7 @@ timestamp='2022-09-17'
 #	CPU_TYPE-MANUFACTURER-KERNEL-OPERATING_SYSTEM
 # It is wrong to echo any other type of specification.
 
-# The "shellcheck disable" line above the timestamp inhibits complaints
-# about features and limitations of the classic Bourne shell that were
-# superseded or lifted in POSIX.  However, this script identifies a wide
-# variety of pre-POSIX systems that do not have POSIX shells at all, and
-# even some reasonably current systems (Solaris 10 as case-in-point) still
-# have a pre-POSIX /bin/sh.
-
-me=`echo "$0" | sed -e 's,.*/,,'`
+me=$(echo "$0" | sed -e 's,.*/,,')
 
 usage="\
 Usage: $0 [OPTION] CPU-MFR-OPSYS or ALIAS
@@ -76,7 +67,7 @@ Report bugs and patches to <config-patches@gnu.org>."
 version="\
 GNU config.sub ($timestamp)
 
-Copyright 1992-2022 Free Software Foundation, Inc.
+Copyright 1992-2021 Free Software Foundation, Inc.
 
 This is free software; see the source for copying conditions.  There is NO
 warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE."
@@ -121,11 +112,9 @@ esac
 
 # Split fields of configuration type
 # shellcheck disable=SC2162
-saved_IFS=$IFS
 IFS="-" read field1 field2 field3 field4 <<EOF
 $1
 EOF
-IFS=$saved_IFS
 
 # Separate into logical components for further validation
 case $1 in
@@ -145,7 +134,7 @@ case $1 in
 			nto-qnx* | linux-* | uclinux-uclibc* \
 			| uclinux-gnu* | kfreebsd*-gnu* | knetbsd*-gnu* | netbsd*-gnu* \
 			| netbsd*-eabi* | kopensolaris*-gnu* | cloudabi*-eabi* \
-			| storm-chaos* | os2-emx* | rtmk-nova* | managarm-*)
+			| storm-chaos* | os2-emx* | rtmk-nova*)
 				basic_machine=$field1
 				basic_os=$maybe_os
 				;;
@@ -174,10 +163,6 @@ case $1 in
 						basic_machine=$field1
 						basic_os=$field2
 						;;
-					zephyr*)
-						basic_machine=$field1-unknown
-						basic_os=$field2
-						;;
 					# Manufacturers
 					dec* | mips* | sequent* | encore* | pc533* | sgi* | sony* \
 					| att* | 7300* | 3300* | delta* | motorola* | sun[234]* \
@@ -784,22 +769,22 @@ case $basic_machine in
 		vendor=hp
 		;;
 	i*86v32)
-		cpu=`echo "$1" | sed -e 's/86.*/86/'`
+		cpu=$(echo "$1" | sed -e 's/86.*/86/')
 		vendor=pc
 		basic_os=sysv32
 		;;
 	i*86v4*)
-		cpu=`echo "$1" | sed -e 's/86.*/86/'`
+		cpu=$(echo "$1" | sed -e 's/86.*/86/')
 		vendor=pc
 		basic_os=sysv4
 		;;
 	i*86v)
-		cpu=`echo "$1" | sed -e 's/86.*/86/'`
+		cpu=$(echo "$1" | sed -e 's/86.*/86/')
 		vendor=pc
 		basic_os=sysv
 		;;
 	i*86sol2)
-		cpu=`echo "$1" | sed -e 's/86.*/86/'`
+		cpu=$(echo "$1" | sed -e 's/86.*/86/')
 		vendor=pc
 		basic_os=solaris2
 		;;
@@ -932,16 +917,14 @@ case $basic_machine in
 		;;
 	leon-*|leon[3-9]-*)
 		cpu=sparc
-		vendor=`echo "$basic_machine" | sed 's/-.*//'`
+		vendor=$(echo "$basic_machine" | sed 's/-.*//')
 		;;
 
 	*-*)
 		# shellcheck disable=SC2162
-		saved_IFS=$IFS
 		IFS="-" read cpu vendor <<EOF
 $basic_machine
 EOF
-		IFS=$saved_IFS
 		;;
 	# We use `pc' rather than `unknown'
 	# because (1) that's what they normally are, and
@@ -1020,11 +1003,6 @@ case $cpu-$vendor in
 		;;
 
 	# Here we normalize CPU types with a missing or matching vendor
-	armh-unknown | armh-alt)
-		cpu=armv7l
-		vendor=alt
-		basic_os=${basic_os:-linux-gnueabihf}
-		;;
 	dpx20-unknown | dpx20-bull)
 		cpu=rs6000
 		vendor=bull
@@ -1106,7 +1084,7 @@ case $cpu-$vendor in
 		cpu=mipsisa64sb1el
 		;;
 	sh5e[lb]-*)
-		cpu=`echo "$cpu" | sed 's/^\(sh.\)e\(.\)$/\1\2e/'`
+		cpu=$(echo "$cpu" | sed 's/^\(sh.\)e\(.\)$/\1\2e/')
 		;;
 	spur-*)
 		cpu=spur
@@ -1124,9 +1102,9 @@ case $cpu-$vendor in
 		cpu=x86_64
 		;;
 	xscale-* | xscalee[bl]-*)
-		cpu=`echo "$cpu" | sed 's/^xscale/arm/'`
+		cpu=$(echo "$cpu" | sed 's/^xscale/arm/')
 		;;
-	arm64-* | aarch64le-*)
+	arm64-*)
 		cpu=aarch64
 		;;
 
@@ -1187,7 +1165,7 @@ case $cpu-$vendor in
 			| alphapca5[67] | alpha64pca5[67] \
 			| am33_2.0 \
 			| amdgcn \
-			| arc | arceb | arc32 | arc64 \
+			| arc | arceb \
 			| arm | arm[lb]e | arme[lb] | armv* \
 			| avr | avr32 \
 			| asmjs \
@@ -1207,7 +1185,7 @@ case $cpu-$vendor in
 			| k1om \
 			| le32 | le64 \
 			| lm32 \
-			| loongarch32 | loongarch64 \
+			| loongarch32 | loongarch64 | loongarchx32 \
 			| m32c | m32r | m32rle \
 			| m5200 | m68000 | m680[012346]0 | m68360 | m683?2 | m68k \
 			| m6811 | m68hc11 | m6812 | m68hc12 | m68hcs12x \
@@ -1226,13 +1204,9 @@ case $cpu-$vendor in
 			| mips64vr5900 | mips64vr5900el \
 			| mipsisa32 | mipsisa32el \
 			| mipsisa32r2 | mipsisa32r2el \
-			| mipsisa32r3 | mipsisa32r3el \
-			| mipsisa32r5 | mipsisa32r5el \
 			| mipsisa32r6 | mipsisa32r6el \
 			| mipsisa64 | mipsisa64el \
 			| mipsisa64r2 | mipsisa64r2el \
-			| mipsisa64r3 | mipsisa64r3el \
-			| mipsisa64r5 | mipsisa64r5el \
 			| mipsisa64r6 | mipsisa64r6el \
 			| mipsisa64sb1 | mipsisa64sb1el \
 			| mipsisa64sr71k | mipsisa64sr71kel \
@@ -1309,41 +1283,35 @@ esac
 if test x$basic_os != x
 then
 
-# First recognize some ad-hoc cases, or perhaps split kernel-os, or else just
+# First recognize some ad-hoc caes, or perhaps split kernel-os, or else just
 # set os.
 case $basic_os in
 	gnu/linux*)
 		kernel=linux
-		os=`echo "$basic_os" | sed -e 's|gnu/linux|gnu|'`
+		os=$(echo $basic_os | sed -e 's|gnu/linux|gnu|')
 		;;
 	os2-emx)
 		kernel=os2
-		os=`echo "$basic_os" | sed -e 's|os2-emx|emx|'`
+		os=$(echo $basic_os | sed -e 's|os2-emx|emx|')
 		;;
 	nto-qnx*)
 		kernel=nto
-		os=`echo "$basic_os" | sed -e 's|nto-qnx|qnx|'`
+		os=$(echo $basic_os | sed -e 's|nto-qnx|qnx|')
 		;;
 	*-*)
 		# shellcheck disable=SC2162
-		saved_IFS=$IFS
 		IFS="-" read kernel os <<EOF
 $basic_os
 EOF
-		IFS=$saved_IFS
 		;;
 	# Default OS when just kernel was specified
 	nto*)
 		kernel=nto
-		os=`echo "$basic_os" | sed -e 's|nto|qnx|'`
+		os=$(echo $basic_os | sed -e 's|nto|qnx|')
 		;;
 	linux*)
 		kernel=linux
-		os=`echo "$basic_os" | sed -e 's|linux|gnu|'`
-		;;
-	managarm*)
-		kernel=managarm
-		os=`echo "$basic_os" | sed -e 's|managarm|mlibc|'`
+		os=$(echo $basic_os | sed -e 's|linux|gnu|')
 		;;
 	*)
 		kernel=
@@ -1364,7 +1332,7 @@ case $os in
 		os=cnk
 		;;
 	solaris1 | solaris1.*)
-		os=`echo "$os" | sed -e 's|solaris1|sunos4|'`
+		os=$(echo $os | sed -e 's|solaris1|sunos4|')
 		;;
 	solaris)
 		os=solaris2
@@ -1393,7 +1361,7 @@ case $os in
 		os=sco3.2v4
 		;;
 	sco3.2.[4-9]*)
-		os=`echo "$os" | sed -e 's/sco3.2./sco3.2v/'`
+		os=$(echo $os | sed -e 's/sco3.2./sco3.2v/')
 		;;
 	sco*v* | scout)
 		# Don't match below
@@ -1423,7 +1391,7 @@ case $os in
 		os=lynxos
 		;;
 	mac[0-9]*)
-		os=`echo "$os" | sed -e 's|mac|macos|'`
+		os=$(echo "$os" | sed -e 's|mac|macos|')
 		;;
 	opened*)
 		os=openedition
@@ -1432,10 +1400,10 @@ case $os in
 		os=os400
 		;;
 	sunos5*)
-		os=`echo "$os" | sed -e 's|sunos5|solaris2|'`
+		os=$(echo "$os" | sed -e 's|sunos5|solaris2|')
 		;;
 	sunos6*)
-		os=`echo "$os" | sed -e 's|sunos6|solaris3|'`
+		os=$(echo "$os" | sed -e 's|sunos6|solaris3|')
 		;;
 	wince*)
 		os=wince
@@ -1469,7 +1437,7 @@ case $os in
 		;;
 	# Preserve the version number of sinix5.
 	sinix5.*)
-		os=`echo "$os" | sed -e 's|sinix|sysv|'`
+		os=$(echo $os | sed -e 's|sinix|sysv|')
 		;;
 	sinix*)
 		os=sysv4
@@ -1716,7 +1684,7 @@ fi
 # Now, validate our (potentially fixed-up) OS.
 case $os in
 	# Sometimes we do "kernel-libc", so those need to count as OSes.
-	musl* | newlib* | relibc* | uclibc*)
+	musl* | newlib* | uclibc*)
 		;;
 	# Likewise for "kernel-abi"
 	eabi* | gnueabi*)
@@ -1739,7 +1707,7 @@ case $os in
 	     | nindy* | vxsim* | vxworks* | ebmon* | hms* | mvs* \
 	     | clix* | riscos* | uniplus* | iris* | isc* | rtu* | xenix* \
 	     | mirbsd* | netbsd* | dicos* | openedition* | ose* \
-	     | bitrig* | openbsd* | secbsd* | solidbsd* | libertybsd* | os108* \
+	     | bitrig* | openbsd* | solidbsd* | libertybsd* | os108* \
 	     | ekkobsd* | freebsd* | riscix* | lynxos* | os400* \
 	     | bosx* | nextstep* | cxux* | aout* | elf* | oabi* \
 	     | ptx* | coff* | ecoff* | winnt* | domain* | vsta* \
@@ -1757,8 +1725,7 @@ case $os in
 	     | skyos* | haiku* | rdos* | toppers* | drops* | es* \
 	     | onefs* | tirtos* | phoenix* | fuchsia* | redox* | bme* \
 	     | midnightbsd* | amdhsa* | unleashed* | emscripten* | wasi* \
-	     | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx* | zephyr* \
-	     | fiwix* | mlibc* )
+	     | nsk* | powerunix* | genode* | zvmoe* | qnx* | emx*)
 		;;
 	# This one is extra strict with allowed versions
 	sco3.2v2 | sco3.2v[4-9]* | sco5v6*)
@@ -1766,9 +1733,6 @@ case $os in
 		;;
 	none)
 		;;
-	kernel* )
-		# Restricted further below
-		;;
 	*)
 		echo Invalid configuration \`"$1"\': OS \`"$os"\' not recognized 1>&2
 		exit 1
@@ -1778,27 +1742,16 @@ esac
 # As a final step for OS-related things, validate the OS-kernel combination
 # (given a valid OS), if there is a kernel.
 case $kernel-$os in
-	linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib* \
-		   | linux-musl* | linux-relibc* | linux-uclibc* | linux-mlibc* )
+	linux-gnu* | linux-dietlibc* | linux-android* | linux-newlib* | linux-musl* | linux-uclibc* )
 		;;
 	uclinux-uclibc* )
 		;;
-	managarm-mlibc* | managarm-kernel* )
-		;;
-	-dietlibc* | -newlib* | -musl* | -relibc* | -uclibc* | -mlibc* )
+	-dietlibc* | -newlib* | -musl* | -uclibc* )
 		# These are just libc implementations, not actual OSes, and thus
 		# require a kernel.
 		echo "Invalid configuration \`$1': libc \`$os' needs explicit kernel." 1>&2
 		exit 1
 		;;
-	-kernel* )
-		echo "Invalid configuration \`$1': \`$os' needs explicit kernel." 1>&2
-		exit 1
-		;;
-	*-kernel* )
-		echo "Invalid configuration \`$1': \`$kernel' does not support \`$os'." 1>&2
-		exit 1
-		;;
 	kfreebsd*-gnu* | kopensolaris*-gnu*)
 		;;
 	vxworks-simlinux | vxworks-simwindows | vxworks-spe)

configure.ac

@@ -23,15 +23,15 @@ 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="$1"
-		CFLAGS="$TESTFLAGS $CFLAGS"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
+		CFLAGS="$CFLAGS $TESTFLAGS"
+		AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
+			[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
 			[AC_MSG_NOTICE([Not setting $TESTFLAGS]); CFLAGS="$OLDFLAGS" ]
 			)
 }])
@@ -42,25 +42,12 @@ if test -z "$ORIGCFLAGS" && test "$GCC" = "yes"; then
 	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])
 
@@ -94,15 +81,15 @@ if test "$hardenbuild" -eq 1; then
 
 		OLDLDFLAGS="$LDFLAGS"
 		TESTFLAGS="-Wl,-pie"
-		LDFLAGS="$TESTFLAGS $LDFLAGS"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
+		LDFLAGS="$LDFLAGS $TESTFLAGS"
+		AC_LINK_IFELSE([AC_LANG_PROGRAM([])], 
+			[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
 			[
 				LDFLAGS="$OLDLDFLAGS"
 				TESTFLAGS="-pie"
-				LDFLAGS="$TESTFLAGS $LDFLAGS"
-				AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-					[AC_MSG_NOTICE([Setting $TESTFLAGS])],
+				LDFLAGS="$LDFLAGS $TESTFLAGS"
+				AC_LINK_IFELSE([AC_LANG_PROGRAM([])], 
+					[AC_MSG_NOTICE([Setting $TESTFLAGS])], 
 					[AC_MSG_NOTICE([Not setting $TESTFLAGS]); LDFLAGS="$OLDLDFLAGS" ]
 					)
 			]
@@ -110,24 +97,24 @@ if test "$hardenbuild" -eq 1; then
 		# readonly elf relocation sections (relro)
 		OLDLDFLAGS="$LDFLAGS"
 		TESTFLAGS="-Wl,-z,now -Wl,-z,relro"
-		LDFLAGS="$TESTFLAGS $LDFLAGS"
-		AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-			[AC_MSG_NOTICE([Setting $TESTFLAGS])],
+		LDFLAGS="$LDFLAGS $TESTFLAGS"
+		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="$CFLAGS"
 	TESTFLAGS="-fstack-protector-strong"
-	CFLAGS="$TESTFLAGS $CFLAGS"
-	AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-	    [AC_MSG_NOTICE([Setting $TESTFLAGS])],
+	CFLAGS="$CFLAGS $TESTFLAGS"
+	AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
+	    [AC_MSG_NOTICE([Setting $TESTFLAGS])], 
 	    [
 			CFLAGS="$OLDCFLAGS"
 			TESTFLAGS="-fstack-protector --param=ssp-buffer-size=4"
-			CFLAGS="$TESTFLAGS $CFLAGS"
-			AC_LINK_IFELSE([AC_LANG_PROGRAM([])],
-			    [AC_MSG_NOTICE([Setting $TESTFLAGS])],
+			CFLAGS="$CFLAGS $TESTFLAGS"
+			AC_COMPILE_IFELSE([AC_LANG_PROGRAM([])], 
+			    [AC_MSG_NOTICE([Setting $TESTFLAGS])], 
 			    [AC_MSG_NOTICE([Not setting $TESTFLAGS]); CFLAGS="$OLDCFLAGS" ]
 			    )
 	    ]
@@ -187,7 +174,7 @@ 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.
@@ -204,7 +191,7 @@ AC_CHECK_TOOL(STRIP, strip, :)
 AC_CHECK_TOOL(INSTALL, 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.])
@@ -212,14 +199,14 @@ 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
@@ -399,7 +386,7 @@ AC_CHECK_HEADERS([netinet/in.h netinet/tcp.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 \
-	sys/random.h sys/prctl.h])
+	sys/random.h])
 
 # Checks for typedefs, structures, and compiler characteristics.
 AC_C_CONST
@@ -581,7 +568,7 @@ AC_ARG_ENABLE(bundled-libtom,
 )
 
 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)
@@ -654,7 +641,7 @@ 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
@@ -729,7 +716,7 @@ 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])
@@ -759,7 +746,7 @@ 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])
@@ -791,7 +778,7 @@ 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
@@ -819,7 +806,7 @@ 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])
@@ -846,7 +833,7 @@ 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
@@ -854,7 +841,7 @@ 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 fexecve])
+AC_CHECK_FUNCS([freeaddrinfo getnameinfo fork writev getgrouplist])
 
 AC_SEARCH_LIBS(basename, gen, AC_DEFINE(HAVE_BASENAME))
 
@@ -882,7 +869,7 @@ 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
 

crypto_desc.c

@@ -24,6 +24,12 @@ void crypto_init() {
 #if DROPBEAR_AES
 		&aes_desc,
 #endif
+#if DROPBEAR_BLOWFISH
+		&blowfish_desc,
+#endif
+#if DROPBEAR_TWOFISH
+		&twofish_desc,
+#endif
 #if DROPBEAR_3DES
 		&des3_desc,
 #endif
@@ -31,8 +37,10 @@ void crypto_init() {
 	};
 
 	const struct ltc_hash_descriptor *reghashes[] = {
-#if DROPBEAR_SHA1_HMAC
+		/* we need sha1 for hostkey stuff regardless */
 		&sha1_desc,
+#if DROPBEAR_MD5_HMAC
+		&md5_desc,
 #endif
 #if DROPBEAR_SHA256
 		&sha256_desc,
@@ -44,9 +52,9 @@ void crypto_init() {
 		&sha512_desc,
 #endif
 		NULL
-	};
+	};	
 	int i;
-
+	
 	for (i = 0; regciphers[i] != NULL; i++) {
 		if (register_cipher(regciphers[i]) == -1) {
 			dropbear_exit("Error registering crypto");

dbclient.1

@@ -94,18 +94,7 @@ is performed at all, this is usually undesirable.
 .B \-A
 Forward agent connections to the remote host. dbclient will use any
 OpenSSH-style agent program if available ($SSH_AUTH_SOCK will be set) for
-public key authentication.  Forwarding is only enabled if \fI-A\fR is specified.
-
-Beware that a forwarded agent connection will allow the remote server to have
-the same authentication credentials as you have used locally. A compromised
-remote server could use that to log in to other servers. 
-
-In many situations Dropbear's multi-hop mode is a better and more secure alternative
-to agent forwarding, avoiding having to trust the intermediate server.
-
-If the SSH agent program is set to prompt when a key is used, the 
-\fI-o DisableTrivialAuth\fR option can prevent UI confusion.
-
+public key authentication.  Forwarding is only enabled if -A is specified.
 .TP
 .B \-W \fIwindowsize
 Specify the per-channel receive window buffer size. Increasing this 
@@ -122,9 +111,6 @@ if 0 disables keepalives. If no response is received for 3 consecutive keepalive
 .B \-I \fIidle_timeout
 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
 .TP
-.B \-z
-By default Dropbear will send network traffic with the \fBAF21\fR setting for QoS, letting network devices give it higher priority. Some devices may have problems with that, \fI-z\fR can be used to disable it.
-.TP
 
 .\" TODO: how to avoid a line break between these two -J arguments?
 .B \-J \fIproxy_command
@@ -170,13 +156,6 @@ Send dbclient log messages to syslog in addition to stderr.
 .TP
 .B Port
 Specify a listening port, like the \fI-p\fR argument.
-.TP
-.B DisableTrivialAuth
-Disallow 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. 
 .RE
 .TP
 .B \-s 

dbmulti.c

@@ -23,15 +23,20 @@
  * SOFTWARE. */
 
 #include "includes.h"
-#include "dbutil.h"
 
-static int runprog(const char *multipath,
-		const char *progname, int argc, char ** argv, int *match) {
+/* definitions are cleanest if we just put them here */
+int dropbear_main(int argc, char ** argv);
+int cli_main(int argc, char ** argv);
+int dropbearkey_main(int argc, char ** argv);
+int dropbearconvert_main(int argc, char ** argv);
+int scp_main(int argc, char ** argv);
+
+static int runprog(const char *progname, int argc, char ** argv, int *match) {
 	*match = DROPBEAR_SUCCESS;
 
 #ifdef DBMULTI_dropbear
 		if (strcmp(progname, "dropbear") == 0) {
-			return dropbear_main(argc, argv, multipath);
+			return dropbear_main(argc, argv);
 		}
 #endif
 #ifdef DBMULTI_dbclient
@@ -62,16 +67,12 @@ static int runprog(const char *multipath,
 int main(int argc, char ** argv) {
 	int i;
 	for (i = 0; i < 2; i++) {
-		const char* multipath = NULL;
-		if (i == 1) {
-			multipath = argv[0];
-		}
 		/* Try symlink first, then try as an argument eg "dropbearmulti dbclient host ..." */
 		if (argc > i) {
 			int match, res;
 			/* figure which form we're being called as */
 			const char* progname = basename(argv[i]);
-			res = runprog(multipath, progname, argc-i, &argv[i], &match);
+			res = runprog(progname, argc-i, &argv[i], &match);
 			if (match == DROPBEAR_SUCCESS) {
 				return res;
 			}

dbrandom.c

@@ -34,7 +34,7 @@ static uint32_t counter = 0;
 /* the max value for the counter, so it won't integer overflow */
 #define MAX_COUNTER (1<<30)
 
-static unsigned char hashpool[SHA256_HASH_SIZE] = {0};
+static unsigned char hashpool[SHA1_HASH_SIZE] = {0};
 static int donerandinit = 0;
 
 #define INIT_SEED_SIZE 32 /* 256 bits */
@@ -100,7 +100,7 @@ process_file(hash_state *hs, const char *filename,
 			}
 			goto out;
 		}
-		sha256_process(hs, readbuf, readlen);
+		sha1_process(hs, readbuf, readlen);
 		readcount += readlen;
 	}
 	ret = DROPBEAR_SUCCESS;
@@ -120,13 +120,13 @@ void addrandom(const unsigned char * buf, unsigned int len)
 #endif
 
 	/* hash in the new seed data */
-	sha256_init(&hs);
+	sha1_init(&hs);
 	/* existing state (zeroes on startup) */
-	sha256_process(&hs, (void*)hashpool, sizeof(hashpool));
+	sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
 
 	/* new */
-	sha256_process(&hs, buf, len);
-	sha256_done(&hs, hashpool);
+	sha1_process(&hs, buf, len);
+	sha1_done(&hs, hashpool);
 }
 
 static void write_urandom()
@@ -152,10 +152,10 @@ static void write_urandom()
 #if DROPBEAR_FUZZ
 void fuzz_seed(const unsigned char* dat, unsigned int len) {
 	hash_state hs;
-	sha256_init(&hs);
-	sha256_process(&hs, "fuzzfuzzfuzz", strlen("fuzzfuzzfuzz"));
-	sha256_process(&hs, dat, len);
-	sha256_done(&hs, hashpool);
+	sha1_init(&hs);
+	sha1_process(&hs, "fuzzfuzzfuzz", strlen("fuzzfuzzfuzz"));
+	sha1_process(&hs, dat, len);
+	sha1_done(&hs, hashpool);
 	counter = 0;
 	donerandinit = 1;
 }
@@ -209,7 +209,7 @@ static int process_getrandom(hash_state *hs) {
 
 	if (ret == sizeof(buf)) {
 		/* Success, stir in the entropy */
-		sha256_process(hs, (void*)buf, sizeof(buf));
+		sha1_process(hs, (void*)buf, sizeof(buf));
 		return DROPBEAR_SUCCESS;
 	}
 
@@ -221,6 +221,7 @@ static int process_getrandom(hash_state *hs) {
 /* Initialise the prng from /dev/urandom or prngd. This function can
  * be called multiple times */
 void seedrandom() {
+		
 	hash_state hs;
 
 	pid_t pid;
@@ -235,10 +236,10 @@ void seedrandom() {
 #endif
 
 	/* hash in the new seed data */
-	sha256_init(&hs);
+	sha1_init(&hs);
 
 	/* existing state */
-	sha256_process(&hs, (void*)hashpool, sizeof(hashpool));
+	sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
 
 #ifdef HAVE_GETRANDOM
 	if (process_getrandom(&hs) == DROPBEAR_SUCCESS) {
@@ -288,21 +289,21 @@ void seedrandom() {
 #endif
 
 	pid = getpid();
-	sha256_process(&hs, (void*)&pid, sizeof(pid));
+	sha1_process(&hs, (void*)&pid, sizeof(pid));
 
 	/* gettimeofday() doesn't completely fill out struct timeval on 
 	   OS X (10.8.3), avoid valgrind warnings by clearing it first */
 	memset(&tv, 0x0, sizeof(tv));
 	gettimeofday(&tv, NULL);
-	sha256_process(&hs, (void*)&tv, sizeof(tv));
+	sha1_process(&hs, (void*)&tv, sizeof(tv));
 
 	clockval = clock();
-	sha256_process(&hs, (void*)&clockval, sizeof(clockval));
+	sha1_process(&hs, (void*)&clockval, sizeof(clockval));
 
 	/* When a private key is read by the client or server it will
 	 * be added to the hashpool - see runopts.c */
 
-	sha256_done(&hs, hashpool);
+	sha1_done(&hs, hashpool);
 
 	counter = 0;
 	donerandinit = 1;
@@ -316,7 +317,7 @@ void seedrandom() {
 void genrandom(unsigned char* buf, unsigned int len) {
 
 	hash_state hs;
-	unsigned char hash[SHA256_HASH_SIZE];
+	unsigned char hash[SHA1_HASH_SIZE];
 	unsigned int copylen;
 
 	if (!donerandinit) {
@@ -324,17 +325,17 @@ void genrandom(unsigned char* buf, unsigned int len) {
 	}
 
 	while (len > 0) {
-		sha256_init(&hs);
-		sha256_process(&hs, (void*)hashpool, sizeof(hashpool));
-		sha256_process(&hs, (void*)&counter, sizeof(counter));
-		sha256_done(&hs, hash);
+		sha1_init(&hs);
+		sha1_process(&hs, (void*)hashpool, sizeof(hashpool));
+		sha1_process(&hs, (void*)&counter, sizeof(counter));
+		sha1_done(&hs, hash);
 
 		counter++;
 		if (counter > MAX_COUNTER) {
 			seedrandom();
 		}
 
-		copylen = MIN(len, SHA256_HASH_SIZE);
+		copylen = MIN(len, SHA1_HASH_SIZE);
 		memcpy(buf, hash, copylen);
 		len -= copylen;
 		buf += copylen;
@@ -347,7 +348,7 @@ void genrandom(unsigned char* buf, unsigned int len) {
  * rand must be an initialised *mp_int for the result.
  * the result rand satisfies:  0 < rand < max 
  * */
-void gen_random_mpint(const mp_int *max, mp_int *rand) {
+void gen_random_mpint(mp_int *max, mp_int *rand) {
 
 	unsigned char *randbuf = NULL;
 	unsigned int len = 0;

dbrandom.h

@@ -30,6 +30,6 @@
 void seedrandom(void);
 void genrandom(unsigned char* buf, unsigned int len);
 void addrandom(const unsigned char * buf, unsigned int len);
-void gen_random_mpint(const mp_int *max, mp_int *rand);
+void gen_random_mpint(mp_int *max, mp_int *rand);
 
 #endif /* DROPBEAR_RANDOM_H_ */

dbutil.c

@@ -155,7 +155,7 @@ void dropbear_log(int priority, const char* format, ...) {
 }
 
 
-#if DEBUG_TRACE 
+#if DEBUG_TRACE
 
 static double debug_start_time = -1;
 
@@ -185,63 +185,39 @@ static double time_since_start()
 	return nowf - debug_start_time;
 }
 
-static void dropbear_tracelevel(int level, const char *format, va_list param)
-{
-	if (debug_trace == 0 || debug_trace < level) {
+void dropbear_trace(const char* format, ...) {
+	va_list param;
+
+	if (!debug_trace) {
 		return;
 	}
 
-	fprintf(stderr, "TRACE%d (%d) %f: ", level, getpid(), time_since_start());
+	va_start(param, format);
+	fprintf(stderr, "TRACE  (%d) %f: ", getpid(), time_since_start());
 	vfprintf(stderr, format, param);
 	fprintf(stderr, "\n");
-}
-#if (DEBUG_TRACE>=1)
-void dropbear_trace1(const char* format, ...) {
-	va_list param;
-
-	va_start(param, format);
-	dropbear_tracelevel(1, format, param);
 	va_end(param);
 }
-#endif
-#if (DEBUG_TRACE>=2)
+
 void dropbear_trace2(const char* format, ...) {
+	static int trace_env = -1;
 	va_list param;
 
-	va_start(param, format);
-	dropbear_tracelevel(2, format, param);
-	va_end(param);
-}
-#endif
-#if (DEBUG_TRACE>=3)
-void dropbear_trace3(const char* format, ...) {
-	va_list param;
+	if (trace_env == -1) {
+		trace_env = getenv("DROPBEAR_TRACE2") ? 1 : 0;
+	}
+
+	if (!(debug_trace && trace_env)) {
+		return;
+	}
 
 	va_start(param, format);
-	dropbear_tracelevel(3, format, param);
+	fprintf(stderr, "TRACE2 (%d) %f: ", getpid(), time_since_start());
+	vfprintf(stderr, format, param);
+	fprintf(stderr, "\n");
 	va_end(param);
 }
-#endif
-#if (DEBUG_TRACE>=4)
-void dropbear_trace4(const char* format, ...) {
-	va_list param;
-
-	va_start(param, format);
-	dropbear_tracelevel(4, format, param);
-	va_end(param);
-}
-#endif
-#if (DEBUG_TRACE>=5)
-void dropbear_trace5(const char* format, ...) {
-	va_list param;
-
-	va_start(param, format);
-	dropbear_tracelevel(5, format, param);
-	va_end(param);
-}
-#endif
-#endif
-
+#endif /* DEBUG_TRACE */
 
 /* Connect to a given unix socket. The socket is blocking */
 #if ENABLE_CONNECT_UNIX
@@ -442,7 +418,7 @@ void printhex(const char * label, const unsigned char * buf, int len) {
 	}
 }
 
-void printmpint(const char *label, const mp_int *mp) {
+void printmpint(const char *label, mp_int *mp) {
 	buffer *buf = buf_new(1000);
 	buf_putmpint(buf, mp);
 	fprintf(stderr, "%d bits ", mp_count_bits(mp));
@@ -599,14 +575,9 @@ void setnonblocking(int fd) {
 }
 
 void disallow_core() {
-	struct rlimit lim = {0};
-	if (getrlimit(RLIMIT_CORE, &lim) < 0) {
-		TRACE(("getrlimit(RLIMIT_CORE) failed"));
-	}
-	lim.rlim_cur = 0;
-	if (setrlimit(RLIMIT_CORE, &lim) < 0) {
-		TRACE(("setrlimit(RLIMIT_CORE) failed"));
-	}
+	struct rlimit lim;
+	lim.rlim_cur = lim.rlim_max = 0;
+	setrlimit(RLIMIT_CORE, &lim);
 }
 
 /* Returns DROPBEAR_SUCCESS or DROPBEAR_FAILURE, with the result in *val */
@@ -617,7 +588,7 @@ int m_str_to_uint(const char* str, unsigned int *val) {
 	l = strtoul(str, &endp, 10);
 
 	if (endp == str || *endp != '\0') {
-		/* parse error */
+		// parse error
 		return DROPBEAR_FAILURE;
 	}
 
@@ -633,11 +604,11 @@ int m_str_to_uint(const char* str, unsigned int *val) {
 	}
 }
 
-/* Returns malloced path. inpath beginning with '~/' expanded,
-   otherwise returned as-is */
+/* Returns malloced path. inpath beginning with '/' is returned as-is,
+otherwise home directory is prepended */
 char * expand_homedir_path(const char *inpath) {
 	struct passwd *pw = NULL;
-	if (strncmp(inpath, "~/", 2) == 0) {
+	if (inpath[0] != '/') {
 		char *homedir = getenv("HOME");
 
 		if (!homedir) {
@@ -648,9 +619,9 @@ char * expand_homedir_path(const char *inpath) {
 		}
 
 		if (homedir) {
-			int len = strlen(inpath)-2 + strlen(homedir) + 2;
+			int len = strlen(inpath) + strlen(homedir) + 2;
 			char *buf = m_malloc(len);
-			snprintf(buf, len, "%s/%s", homedir, inpath+2);
+			snprintf(buf, len, "%s/%s", homedir, inpath);
 			return buf;
 		}
 	}
@@ -724,7 +695,7 @@ void gettime_wrapper(struct timespec *now) {
 	/* Fallback for everything else - this will sometimes go backwards */
 	gettimeofday(&tv, NULL);
 	now->tv_sec = tv.tv_sec;
-	now->tv_nsec = 1000*(long)tv.tv_usec;
+	now->tv_nsec = 1000*tv.tv_usec;
 }
 
 /* second-resolution monotonic timestamp */
@@ -771,16 +742,3 @@ int fd_read_pending(int fd) {
 		return FD_ISSET(fd, &fds);
 	}
 }
-
-int m_snprintf(char *str, size_t size, const char *format, ...) {
-	va_list param;
-	int ret;
-
-	va_start(param, format);
-	ret = vsnprintf(str, size, format, param);
-	va_end(param);
-	if (ret < 0) {
-		dropbear_exit("snprintf failed");
-	}
-	return ret;
-}

dbutil.h

@@ -47,13 +47,10 @@ void dropbear_log(int priority, const char* format, ...) ATTRIB_PRINTF(2,3) ;
 void fail_assert(const char* expr, const char* file, int line) ATTRIB_NORETURN;
 
 #if DEBUG_TRACE
-void dropbear_trace1(const char* format, ...) ATTRIB_PRINTF(1,2);
+void dropbear_trace(const char* format, ...) ATTRIB_PRINTF(1,2);
 void dropbear_trace2(const char* format, ...) ATTRIB_PRINTF(1,2);
-void dropbear_trace3(const char* format, ...) ATTRIB_PRINTF(1,2);
-void dropbear_trace4(const char* format, ...) ATTRIB_PRINTF(1,2);
-void dropbear_trace5(const char* format, ...) ATTRIB_PRINTF(1,2);
 void printhex(const char * label, const unsigned char * buf, int len);
-void printmpint(const char *label, const mp_int *mp);
+void printmpint(const char *label, mp_int *mp);
 void debug_start_net(void);
 extern int debug_trace;
 #endif
@@ -73,8 +70,6 @@ void m_close(int fd);
 void setnonblocking(int fd);
 void disallow_core(void);
 int m_str_to_uint(const char* str, unsigned int *val);
-/* The same as snprintf() but exits rather than returning negative */
-int m_snprintf(char *str, size_t size, const char *format, ...);
 
 /* Used to force mp_ints to be initialised */
 #define DEF_MP_INT(X) mp_int X = {0, 0, 0, NULL}
@@ -104,12 +99,4 @@ int fd_read_pending(int fd);
 #define DROPBEAR_FD_ZERO(fds) FD_ZERO(fds)
 #endif
 
-/* dropbearmulti entry points */
-int dropbear_main(int argc, char ** argv, const char * multipath);
-int cli_main(int argc, char ** argv);
-int dropbearkey_main(int argc, char ** argv);
-int dropbearconvert_main(int argc, char ** argv);
-int scp_main(int argc, char ** argv);
-
-
 #endif /* DROPBEAR_DBUTIL_H_ */

debian/changelog

@@ -1,15 +1,3 @@
-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.

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" || \

debug.h

@@ -48,43 +48,15 @@
 /*#define DEBUG_KEXHASH*/
 /*#define DEBUG_RSA*/
 
-/* The level of TRACE() statements */
-#define DROPBEAR_VERBOSE_LEVEL 4
-
+/* you don't need to touch this block */
 #if DEBUG_TRACE
 extern int debug_trace;
-#endif
-
-/* Enable debug trace levels.
-   We can't use __VA_ARGS_ here because Dropbear supports 
-   old ~C89 compilers */
-/* Default is to discard output ... */
-#define DEBUG1(X)
-#define DEBUG2(X)
-#define DEBUG3(X)
+#define TRACE(X) dropbear_trace X;
+#define TRACE2(X) dropbear_trace2 X;
+#else /*DEBUG_TRACE*/
 #define TRACE(X)
 #define TRACE2(X)
-/* ... unless DEBUG_TRACE is high enough */
-#if (DEBUG_TRACE>=1)
-#undef DEBUG1
-#define DEBUG1(X) dropbear_trace1 X;
-#endif
-#if (DEBUG_TRACE>=2)
-#undef DEBUG2
-#define DEBUG2(X) dropbear_trace2 X;
-#endif
-#if (DEBUG_TRACE>=3)
-#undef DEBUG3
-#define DEBUG3(X) dropbear_trace3 X;
-#endif
-#if (DEBUG_TRACE>=4)
-#undef TRACE
-#define TRACE(X) dropbear_trace4 X;
-#endif
-#if (DEBUG_TRACE>=5)
-#undef TRACE2
-#define TRACE2(X) dropbear_trace5 X;
-#endif
+#endif /*DEBUG_TRACE*/
 
 /* To debug with GDB it is easier to run with no forking of child processes.
    You will need to pass "-F" as well. */

default_options.h

@@ -6,7 +6,7 @@
 default_options.h  documents compile-time options, and provides default values.
 
 Local customisation should be added to localoptions.h which is
-used if it exists in the build directory. Options defined there will override
+used if it exists in the build directory. Options defined there will override 
 any options in this file.
 
 Options can also be defined with -DDROPBEAR_XXX=[0,1] in Makefile CFLAGS
@@ -18,9 +18,7 @@ IMPORTANT: Some options will require "make clean" after changes */
 /* Listen on all interfaces */
 #define DROPBEAR_DEFADDRESS ""
 
-/* Default hostkey paths - these can be specified on the command line.
- * Homedir is prepended if path begins with ~/
- */
+/* Default hostkey paths - these can be specified on the command line */
 #define DSS_PRIV_FILENAME "/etc/dropbear/dropbear_dss_host_key"
 #define RSA_PRIV_FILENAME "/etc/dropbear/dropbear_rsa_host_key"
 #define ECDSA_PRIV_FILENAME "/etc/dropbear/dropbear_ecdsa_host_key"
@@ -39,18 +37,8 @@ IMPORTANT: Some options will require "make clean" after changes */
 #define NON_INETD_MODE 1
 #define INETD_MODE 1
 
-/* By default Dropbear will re-execute itself for each incoming connection so
-   that memory layout may be re-randomised (ASLR) - exploiting
-   vulnerabilities becomes harder. Re-exec causes slightly more memory use
-   per connection.
-   This option is ignored on non-Linux platforms at present */
-#define DROPBEAR_REEXEC 1
-
-/* Include verbose debug output, enabled with -v at runtime (repeat to increase).
- * define which level of debug output you compile in
- * TRACE1 - TRACE3 = approx 4 Kb (connection, remote identity, algos, auth type info)
- * TRACE4 = approx 17 Kb (detailed before connection)
- * TRACE5 = approx 8 Kb (detailed after connection) */
+/* Include verbose debug output, enabled with -v at runtime. 
+ * This will add a reasonable amount to your executable size. */
 #define DEBUG_TRACE 0
 
 /* Set this if you want to use the DROPBEAR_SMALL_CODE option. This can save
@@ -78,7 +66,7 @@ IMPORTANT: Some options will require "make clean" after changes */
 /* Note: Both DROPBEAR_CLI_PROXYCMD and DROPBEAR_CLI_NETCAT must be set to
  * allow multihop dbclient connections */
 
-/* Allow using -J <proxycommand> to run the connection through a
+/* Allow using -J <proxycommand> to run the connection through a 
    pipe to a program, rather the normal TCP connection */
 #define DROPBEAR_CLI_PROXYCMD 1
 
@@ -92,11 +80,13 @@ IMPORTANT: Some options will require "make clean" after changes */
 /* Encryption - at least one required.
  * AES128 should be enabled, some very old implementations might only
  * support 3DES.
- * Including both AES keysize variants (128 and 256) will result in
+ * Including both AES keysize variants (128 and 256) will result in 
  * a minimal size increase */
 #define DROPBEAR_AES128 1
 #define DROPBEAR_AES256 1
 #define DROPBEAR_3DES 0
+#define DROPBEAR_TWOFISH256 0
+#define DROPBEAR_TWOFISH128 0
 
 /* Enable Chacha20-Poly1305 authenticated encryption mode. This is
  * generally faster than AES256 on CPU w/o dedicated AES instructions,
@@ -118,47 +108,29 @@ IMPORTANT: Some options will require "make clean" after changes */
  * Compiling in will add ~6kB to binary size on x86-64 */
 #define DROPBEAR_ENABLE_GCM_MODE 0
 
-/* Message integrity. sha2-256 is recommended as a default,
+/* Message integrity. sha2-256 is recommended as a default, 
    sha1 for compatibility */
 #define DROPBEAR_SHA1_HMAC 1
 #define DROPBEAR_SHA2_256_HMAC 1
-#define DROPBEAR_SHA2_512_HMAC 0
 #define DROPBEAR_SHA1_96_HMAC 0
 
 /* Hostkey/public key algorithms - at least one required, these are used
  * for hostkey as well as for verifying signatures with pubkey auth.
- * RSA is recommended.
- *
- * See: RSA_PRIV_FILENAME and DSS_PRIV_FILENAME */
+ * Removing either of these won't save very much space.
+ * RSA is recommended
+ * DSS may be necessary to connect to some systems though
+   is not recommended for new keys */
 #define DROPBEAR_RSA 1
-/* Newer SSH implementations use SHA256 for RSA signatures. SHA1
- * support is required to communicate with some older implementations.
- * It will be removed in future due to SHA1 insecurity, it can be
- * disabled with DROPBEAR_RSA_SHA1 set to 0 */
-#define DROPBEAR_RSA_SHA1 1
-
-/* DSS may be necessary to connect to some systems but is not
- * recommended for new keys (1024 bits is small, and it uses SHA1).
- * RSA key generation will be faster with bundled libtommath
- * if DROPBEAR_DSS is disabled.
- * https://github.com/mkj/dropbear/issues/174#issuecomment-1267374858 */
-#define DROPBEAR_DSS 0
+#define DROPBEAR_DSS 1
 /* ECDSA is significantly faster than RSA or DSS. Compiling in ECC
  * code (either ECDSA or ECDH) increases binary size - around 30kB
- * on x86-64.
- * See: ECDSA_PRIV_FILENAME  */
+ * on x86-64 */
 #define DROPBEAR_ECDSA 1
-
+#define DROPBEAR_SK_ECDSA 1
 /* Ed25519 is faster than ECDSA. Compiling in Ed25519 code increases
- * binary size - around 7,5kB on x86-64.
- * See: ED25519_PRIV_FILENAME  */
+   binary size - around 7,5kB on x86-64 */
 #define DROPBEAR_ED25519 1
-
-/* Allow U2F security keys for public key auth, with
- * sk-ecdsa-sha2-nistp256@openssh.com or sk-ssh-ed25519@openssh.com keys.
- * The corresponding DROPBEAR_ECDSA or DROPBEAR_ED25519 also needs to be set.
- * This is currently server-only. */
-#define DROPBEAR_SK_KEYS 1
+#define DROPBEAR_SK_ED25519 1
 
 /* RSA must be >=1024 */
 #define DROPBEAR_DEFAULT_RSA_SIZE 2048
@@ -192,13 +164,13 @@ IMPORTANT: Some options will require "make clean" after changes */
 
  * Small systems should generally include either curve25519 or ecdh for performance.
  * curve25519 is less widely supported but is faster
- */
+ */ 
 #define DROPBEAR_DH_GROUP14_SHA1 1
 #define DROPBEAR_DH_GROUP14_SHA256 1
 #define DROPBEAR_DH_GROUP16 0
 #define DROPBEAR_CURVE25519 1
 #define DROPBEAR_ECDH 1
-#define DROPBEAR_DH_GROUP1 0
+#define DROPBEAR_DH_GROUP1 1
 
 /* When group1 is enabled it will only be allowed by Dropbear client
 not as a server, due to concerns over its strength. Set to 0 to allow
@@ -233,8 +205,7 @@ group1 in Dropbear server too */
  * You can't enable both PASSWORD and PAM. */
 #define DROPBEAR_SVR_PAM_AUTH 0
 
-/* ~/.ssh/authorized_keys authentication.
- * You must define DROPBEAR_SVR_PUBKEY_AUTH in order to use plugins. */
+/* ~/.ssh/authorized_keys authentication */
 #define DROPBEAR_SVR_PUBKEY_AUTH 1
 
 /* Whether to take public key options in 
@@ -250,10 +221,9 @@ group1 in Dropbear server too */
 #define DROPBEAR_CLI_PASSWORD_AUTH 1
 #define DROPBEAR_CLI_PUBKEY_AUTH 1
 
-/* A default argument for dbclient -i <privatekey>.
- * Homedir is prepended if path begins with ~/
- */
-#define DROPBEAR_DEFAULT_CLI_AUTHKEY "~/.ssh/id_dropbear"
+/* A default argument for dbclient -i <privatekey>. 
+Homedir is prepended unless path begins with / */
+#define DROPBEAR_DEFAULT_CLI_AUTHKEY ".ssh/id_dropbear"
 
 /* Allow specifying the password for dbclient via the DROPBEAR_PASSWORD
  * environment variable. */
@@ -295,9 +265,7 @@ group1 in Dropbear server too */
 #define UNAUTH_CLOSE_DELAY 0
 
 /* The default file to store the daemon's process ID, for shutdown
- * scripts etc. This can be overridden with the -P flag.
- * Homedir is prepended if path begins with ~/
- */
+   scripts etc. This can be overridden with the -P flag */
 #define DROPBEAR_PIDFILE "/var/run/dropbear.pid"
 
 /* The command to invoke for xauth when using X11 forwarding.
@@ -305,11 +273,9 @@ group1 in Dropbear server too */
 #define XAUTH_COMMAND "/usr/bin/xauth -q"
 
 
-/* If you want to enable running an sftp server (such as the one included with
- * OpenSSH), set the path below and set DROPBEAR_SFTPSERVER.
- * The sftp-server program is not provided by Dropbear itself.
- * Homedir is prepended if path begins with ~/
- */
+/* if you want to enable running an sftp server (such as the one included with
+ * OpenSSH), set the path below and set DROPBEAR_SFTPSERVER. 
+ * The sftp-server program is not provided by Dropbear itself */
 #define DROPBEAR_SFTPSERVER 1
 #define SFTPSERVER_PATH "/usr/libexec/sftp-server"
 
@@ -352,6 +318,5 @@ be overridden at runtime with -I. 0 disables idle timeouts */
 
 /* The default path. This will often get replaced by the shell */
 #define DEFAULT_PATH "/usr/bin:/bin"
-#define DEFAULT_ROOT_PATH "/usr/sbin:/usr/bin:/sbin:/bin"
 
 #endif /* DROPBEAR_DEFAULT_OPTIONS_H_ */

dropbear.8

@@ -53,10 +53,6 @@ Disable password logins.
 .B \-g
 Disable password logins for root.
 .TP
-.B \-t
-Enable two-factor authentication. Both password login and public key authentication are
-required. Should not be used with the '-s' option.
-.TP
 .B \-j
 Disable local port forwarding.
 .TP
@@ -101,9 +97,6 @@ of 0 disables keepalives. If no response is received for 3 consecutive keepalive
 .B \-I \fIidle_timeout
 Disconnect the session if no traffic is transmitted or received for \fIidle_timeout\fR seconds.
 .TP
-.B \-z
-By default Dropbear will send network traffic with the \fBAF21\fR setting for QoS, letting network devices give it higher priority. Some devices may have problems with that, \fI-z\fR can be used to disable it.
-.TP
 .B \-T \fImax_authentication_attempts
 Set the number of authentication attempts allowed per connection. If unspecified the default is 10 (MAX_AUTH_TRIES)
 .TP
@@ -151,14 +144,6 @@ same functionality with other means even if no-pty is set.
 .B restrict
 Applies all the no- restrictions listed above.
 
-.TP
-.B permitopen=\fR"\fIhost:port\fR"
-Restrict local port forwarding so that connection is allowed only to the
-specified host and port. Multiple permitopen options separated by commas
-can be set in authorized_keys. Wildcard character ('*') may be used in
-port specification for matching any port. Hosts must be literal domain names or
-IP addresses.
-
 .TP
 .B command=\fR"\fIforced_command\fR"
 Disregard the command provided by the user and always run \fIforced_command\fR.

dropbear_lint.sh

@@ -3,6 +3,6 @@
 EXITCODE=0
 
 # #ifdef instead of #if
-grep '#ifdef DROPBEAR' -I -- *.c *.h && EXITCODE=1
+grep '#ifdef DROPBEAR' -I *.c *.h && EXITCODE=1
 
 exit $EXITCODE

dropbearconvert.1

@@ -9,7 +9,7 @@ dropbearconvert \- convert between Dropbear and OpenSSH private key formats
 .I output_file
 .SH DESCRIPTION
 .B Dropbear
-and
+and 
 .B OpenSSH
 SSH implementations have different private key formats.
 .B dropbearconvert
@@ -24,15 +24,15 @@ first.
 .SH ARGUMENTS
 .TP
 .I input_type
-Either
+Either 
 .I dropbear
-or
+or 
 .I openssh
 .TP
 .I output_type
-Either
+Either 
 .I dropbear
-or
+or 
 .I openssh
 .TP
 .I input_file
@@ -40,15 +40,6 @@ An existing Dropbear or OpenSSH private key file
 .TP
 .I output_file
 The path to write the converted private key file. For client authentication ~/.ssh/id_dropbear is loaded by default
-.SH SUPPORTED FORMATS
-.B dropbearconvert
-can read OpenSSH format files, and older PEM format files (
-.B ssh-keygen
-.I -m PEM
-).
-.B dropbearconvert
-will write OpenSSH format files, usable with OpenSSH 6.5 and later.
-Reading OpenSSH format DSS files or PKCS8 files is not currently supported.
 .SH EXAMPLE
  # dropbearconvert openssh dropbear ~/.ssh/id_rsa ~/.ssh/id_dropbear
 .SH AUTHOR

dropbearconvert.c

@@ -69,7 +69,7 @@ int main(int argc, char ** argv) {
 
 #if DEBUG_TRACE
 	/* It's hard for it to get in the way _too_ much */
-	debug_trace = DROPBEAR_VERBOSE_LEVEL;
+	debug_trace = 1;
 #endif
 
 	/* get the commandline options */

dropbearkey.c

@@ -127,19 +127,18 @@ static void check_signkey_bits(enum signkey_type type, int bits)
 #endif
 #if DROPBEAR_RSA
 		case DROPBEAR_SIGNKEY_RSA:
-			if (bits < 1024 || bits > 4096 || (bits % 8 != 0)) {
-				dropbear_exit("Bits must satisfy 1024 <= bits <= 4096, and be a"
+			if (bits < 512 || bits > 4096 || (bits % 8 != 0)) {
+				dropbear_exit("Bits must satisfy 512 <= bits <= 4096, and be a"
 				              " multiple of 8\n");
 			}
 			break;
 #endif
-#if DROPBEAR_DSS
+#if DROPEAR_DSS
 		case DROPBEAR_SIGNKEY_DSS:
 			if (bits != 1024) {
 				dropbear_exit("DSS keys have a fixed size of 1024 bits\n");
 				exit(EXIT_FAILURE);
 			}
-			break;
 #endif
 		default:
 			(void)0; /* quiet, compiler. ecdsa handles checks itself */
@@ -196,7 +195,7 @@ int main(int argc, char ** argv) {
 					break;
 #if DEBUG_TRACE
 				case 'v':
-					debug_trace = DROPBEAR_VERBOSE_LEVEL;
+					debug_trace = 1;
 					break;
 #endif
 				default:
@@ -310,7 +309,8 @@ static int printpubfile(const char* filename) {
 	err = DROPBEAR_SUCCESS;
 
 out:
-	buf_burn_free(buf);
+	buf_burn(buf);
+	buf_free(buf);
 	buf = NULL;
 	if (key) {
 		sign_key_free(key);
@@ -342,7 +342,7 @@ static void printpubkey(sign_key * key, int keytype) {
 	err = base64_encode(buf_getptr(buf, len), len, base64key, &base64len);
 
 	if (err != CRYPT_OK) {
-		dropbear_exit("base64 failed");
+		fprintf(stderr, "base64 failed");
 	}
 
 	typestring = signkey_name_from_type(keytype, NULL);

fuzz/fuzz-harness.c

@@ -12,8 +12,8 @@ int main(int argc, char ** argv) {
     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);
+            debug_trace = 1;
+            TRACE(("debug printing on"))
         }
 #endif
         if (strcmp(argv[i], "-q") == 0) {

fuzz/fuzzer-verify.c

@@ -3,7 +3,6 @@
 #include "fuzz-wrapfd.h"
 #include "debug.h"
 #include "dss.h"
-#include "ed25519.h"
 
 static void setup_fuzzer(void) {
 	fuzz_common_setup();
@@ -60,21 +59,6 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
 					/* 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();

genrsa.c

@@ -34,7 +34,7 @@
 #if DROPBEAR_RSA
 
 static void getrsaprime(mp_int* prime, mp_int *primeminus, 
-		const mp_int* rsa_e, unsigned int size_bytes);
+		mp_int* rsa_e, unsigned int size_bytes);
 
 /* mostly taken from libtomcrypt's rsa key generation routine */
 dropbear_rsa_key * gen_rsa_priv_key(unsigned int size) {
@@ -89,7 +89,7 @@ dropbear_rsa_key * gen_rsa_priv_key(unsigned int size) {
 
 /* return a prime suitable for p or q */
 static void getrsaprime(mp_int* prime, mp_int *primeminus, 
-		const mp_int* rsa_e, unsigned int size_bytes) {
+		mp_int* rsa_e, unsigned int size_bytes) {
 
 	unsigned char *buf;
 	int trials;

gensignkey.c

@@ -181,7 +181,8 @@ int signkey_generate(enum signkey_type keytype, int bits, const char* filename,
 
 out:
 	if (buf) {
-		buf_burn_free(buf);
+		buf_burn(buf);
+		buf_free(buf);
 	}
 	
 	if (fn_temp) {

includes.h

@@ -127,10 +127,6 @@
 #include <sys/random.h>
 #endif
 
-#ifdef HAVE_SYS_PRCTL_H
-#include <sys/prctl.h>
-#endif
-
 #ifdef BUNDLED_LIBTOM
 #include "libtomcrypt/src/headers/tomcrypt.h"
 #include "libtommath/tommath.h"
@@ -175,8 +171,6 @@ typedef u_int32_t uint32_t;
 #include <dlfcn.h>
 #endif
 
-extern char** environ;
-
 #include "fake-rfc2553.h"
 
 #include "fuzz.h"

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) $(CPPFLAGS)
+LTC_CFLAGS  = -Isrc/headers/ -I$(srcdir)/src/headers/ -I../ -I$(srcdir)/../ -DLTC_SOURCE -I../libtommath/ -I$(srcdir)/../libtommath/ $(CFLAGS)
 LTC_LDFLAGS = $(LDFLAGS) $(EXTRALIBS)
 VERSION=1.18.1
 

libtomcrypt/src/headers/tomcrypt_dropbear.h

@@ -16,6 +16,12 @@
 #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
@@ -50,8 +56,10 @@
 #define LTC_SHA256
 #endif
 
-#if DROPBEAR_SHA1
 #define LTC_SHA1
+
+#if DROPBEAR_MD5
+#define LTC_MD5
 #endif
 
 /* ECC */

libtommath/Makefile.in

@@ -8,7 +8,6 @@ srcdir=@srcdir@
 # So that libtommath can include Dropbear headers for options and m_burn()
 CFLAGS += -I$(srcdir) -I../libtomcrypt/src/headers/ -I$(srcdir)/../libtomcrypt/src/headers/ -I../ -I$(srcdir)/../
 CFLAGS += -Wno-deprecated
-CFLAGS += $(CPPFLAGS)
 
 V = 1
 
@@ -25,14 +24,8 @@ endif
 
 coverage: LIBNAME:=-Wl,--whole-archive $(LIBNAME)  -Wl,--no-whole-archive
 
-# Dropbear sets its own flags below
-IGNORE_SPEED=1
-
 include $(srcdir)/makefile_include.mk
 
-# override makefile_include.mk flags
-LTM_CFLAGS += @DROPBEAR_LTM_CFLAGS@
-
 %.o: %.c $(HEADERS)
 ifneq ($V,1)
 	@echo "   * ${CC} $@"

libtommath/makefile_include.mk

@@ -104,7 +104,7 @@ LIBTOOLFLAGS += -no-undefined
 endif
 
 # add in the standard FLAGS
-LTM_CFLAGS := $(CFLAGS) $(LTM_CFLAGS)
+LTM_CFLAGS += $(CFLAGS)
 LTM_LFLAGS += $(LFLAGS)
 LTM_LDFLAGS += $(LDFLAGS)
 LTM_LIBTOOLFLAGS += $(LIBTOOLFLAGS)

loginrec.c

@@ -459,7 +459,6 @@ line_abbrevname(char *dst, const char *src, size_t dstsize)
 void
 set_utmp_time(struct logininfo *li, struct utmp *ut)
 {
-	/* struct utmp in glibc isn't y2038 safe yet */
 # ifdef HAVE_STRUCT_UTMP_UT_TV
 	ut->ut_tv.tv_sec = li->tv_sec;
 	ut->ut_tv.tv_usec = li->tv_usec;
@@ -830,7 +829,7 @@ utmpx_perform_login(struct logininfo *li)
 		return 0;
 	}
 # else
-	if (!utmpx_write_direct(li, &utx)) {
+	if (!utmpx_write_direct(li, &ut)) {
 		dropbear_log(LOG_WARNING, "utmpx_perform_login: utmp_write_direct() failed");
 		return 0;
 	}
@@ -1273,7 +1272,6 @@ lastlog_construct(struct logininfo *li, struct lastlog *last)
 	(void)line_stripname(last->ll_line, li->line, sizeof(last->ll_line));
 	strlcpy(last->ll_host, li->hostname,
 		MIN_SIZEOF(last->ll_host, li->hostname));
-	/* struct lastlog in glibc isn't y2038 safe yet */
 	last->ll_time = li->tv_sec;
 }
 

loginrec.h

@@ -139,8 +139,8 @@ struct logininfo {
 	/* struct timeval (sys/time.h) isn't always available, if it isn't we'll
 	 * use time_t's value as tv_sec and set tv_usec to 0
 	 */
-	time_t tv_sec;
-	suseconds_t tv_usec;
+	unsigned int tv_sec;
+	unsigned int tv_usec;
 	union login_netinfo hostaddr;       /* caller's host address(es) */
 }; /* struct logininfo */
 

netio.c

@@ -3,7 +3,6 @@
 #include "dbutil.h"
 #include "session.h"
 #include "debug.h"
-#include "runopts.h"
 
 struct dropbear_progress_connection {
 	struct addrinfo *res;
@@ -21,7 +20,6 @@ struct dropbear_progress_connection {
 
 	char* errstring;
 	char *bind_address, *bind_port;
-	enum dropbear_prio prio;
 };
 
 /* Deallocate a progress connection. Removes from the pending list if iter!=NULL.
@@ -112,7 +110,6 @@ static void connect_try_next(struct dropbear_progress_connection *c) {
 
 		ses.maxfd = MAX(ses.maxfd, c->sock);
 		set_sock_nodelay(c->sock);
-		set_sock_priority(c->sock, c->prio);
 		setnonblocking(c->sock);
 
 #if DROPBEAR_CLIENT_TCP_FAST_OPEN
@@ -175,8 +172,8 @@ static void connect_try_next(struct dropbear_progress_connection *c) {
 
 /* Connect via TCP to a host. */
 struct dropbear_progress_connection *connect_remote(const char* remotehost, const char* remoteport,
-	connect_callback cb, void* cb_data,
-	const char* bind_address, const char* bind_port, enum dropbear_prio prio)
+	connect_callback cb, void* cb_data, 
+	const char* bind_address, const char* bind_port)
 {
 	struct dropbear_progress_connection *c = NULL;
 	int err;
@@ -188,7 +185,6 @@ struct dropbear_progress_connection *connect_remote(const char* remotehost, cons
 	c->sock = -1;
 	c->cb = cb;
 	c->cb_data = cb_data;
-	c->prio = prio;
 
 	list_append(&ses.conn_pending, c);
 
@@ -367,7 +363,12 @@ void set_listen_fast_open(int sock) {
 void set_sock_priority(int sock, enum dropbear_prio prio) {
 
 	int rc;
-	int val;
+#ifdef IPTOS_LOWDELAY
+	int iptos_val = 0;
+#endif
+#ifdef HAVE_LINUX_PKT_SCHED_H
+	int so_prio_val = 0;
+#endif
 
 #if DROPBEAR_FUZZ
 	if (fuzz.fuzzing) {
@@ -375,53 +376,37 @@ void set_sock_priority(int sock, enum dropbear_prio prio) {
 		return;
 	}
 #endif
+
 	/* Don't log ENOTSOCK errors so that this can harmlessly be called
 	 * on a client '-J' proxy pipe */
 
-	if (opts.disable_ip_tos == 0) {
-#ifdef IP_TOS
-	/* Set the DSCP field for outbound IP packet priority.
-	rfc4594 has some guidance to meanings.
-
-	We set AF21 as "Low-Latency" class for interactive (tty session,
-	also handshake/setup packets). Other traffic is left at the default.
-
-	OpenSSH at present uses AF21/CS1, rationale
-	https://cvsweb.openbsd.org/src/usr.bin/ssh/readconf.c#rev1.284
-
-	Old Dropbear/OpenSSH and Debian/Ubuntu OpenSSH (at Jan 2022) use
-	IPTOS_LOWDELAY/IPTOS_THROUGHPUT
-
-	DSCP constants are from Linux headers, applicable to other platforms
-	such as macos.
-	*/
+	/* set the TOS bit for either ipv4 or ipv6 */
+#ifdef IPTOS_LOWDELAY
 	if (prio == DROPBEAR_PRIO_LOWDELAY) {
-		val = 0x48; /* IPTOS_DSCP_AF21 */
-	} else {
-		val = 0; /* default */
+		iptos_val = IPTOS_LOWDELAY;
+	} else if (prio == DROPBEAR_PRIO_BULK) {
+		iptos_val = IPTOS_THROUGHPUT;
 	}
 #if defined(IPPROTO_IPV6) && defined(IPV6_TCLASS)
-	rc = setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, (void*)&val, sizeof(val));
+	rc = setsockopt(sock, IPPROTO_IPV6, IPV6_TCLASS, (void*)&iptos_val, sizeof(iptos_val));
 	if (rc < 0 && errno != ENOTSOCK) {
 		TRACE(("Couldn't set IPV6_TCLASS (%s)", strerror(errno)));
 	}
 #endif
-	rc = setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&val, sizeof(val));
+	rc = setsockopt(sock, IPPROTO_IP, IP_TOS, (void*)&iptos_val, sizeof(iptos_val));
 	if (rc < 0 && errno != ENOTSOCK) {
 		TRACE(("Couldn't set IP_TOS (%s)", strerror(errno)));
 	}
-#endif /* IP_TOS */
-	}
+#endif
 
 #ifdef HAVE_LINUX_PKT_SCHED_H
-	/* Set scheduling priority within the local Linux network stack */
 	if (prio == DROPBEAR_PRIO_LOWDELAY) {
-		val = TC_PRIO_INTERACTIVE;
-	} else {
-		val = 0;
+		so_prio_val = TC_PRIO_INTERACTIVE;
+	} else if (prio == DROPBEAR_PRIO_BULK) {
+		so_prio_val = TC_PRIO_BULK;
 	}
 	/* linux specific, sets QoS class. see tc-prio(8) */
-	rc = setsockopt(sock, SOL_SOCKET, SO_PRIORITY, (void*) &val, sizeof(val));
+	rc = setsockopt(sock, SOL_SOCKET, SO_PRIORITY, (void*) &so_prio_val, sizeof(so_prio_val));
 	if (rc < 0 && errno != ENOTSOCK) {
 		TRACE(("Couldn't set SO_PRIORITY (%s)", strerror(errno)))
     }

netio.h

@@ -6,8 +6,9 @@
 #include "queue.h"
 
 enum dropbear_prio {
-	DROPBEAR_PRIO_NORMAL = 0, /* the rest - tcp-fwd, scp, rsync, git, etc */
-	DROPBEAR_PRIO_LOWDELAY, /* pty shell, x11 */
+	DROPBEAR_PRIO_DEFAULT = 10,
+	DROPBEAR_PRIO_LOWDELAY = 11,
+	DROPBEAR_PRIO_BULK = 12,
 };
 
 void set_sock_nodelay(int sock);
@@ -29,8 +30,7 @@ typedef void(*connect_callback)(int result, int sock, void* data, const char* er
 
 /* Always returns a progress connection, if it fails it will call the callback at a later point */
 struct dropbear_progress_connection * connect_remote (const char* remotehost, const char* remoteport,
-	connect_callback cb, void *cb_data, const char* bind_address, const char* bind_port,
-	enum dropbear_prio prio);
+	connect_callback cb, void *cb_data, const char* bind_address, const char* bind_port);
 
 /* Sets up for select() */
 void set_connect_fds(fd_set *writefd);

packet.c

@@ -430,32 +430,44 @@ static buffer* buf_decompress(const buffer* buf, unsigned int len) {
 	z_streamp zstream;
 
 	zstream = ses.keys->recv.zstream;
-	/* We use RECV_MAX_PAYLOAD_LEN+1 here to ensure that
-	   we can detect an oversized payload after inflate() */
-	ret = buf_new(RECV_MAX_PAYLOAD_LEN+1);
+	ret = buf_new(len);
 
 	zstream->avail_in = len;
 	zstream->next_in = buf_getptr(buf, len);
-	zstream->avail_out = ret->size;
-	zstream->next_out = ret->data;
 
-	result = inflate(zstream, Z_SYNC_FLUSH);
-	if (result != Z_OK) {
-		dropbear_exit("zlib error");
+	/* decompress the payload, incrementally resizing the output buffer */
+	while (1) {
+
+		zstream->avail_out = ret->size - ret->pos;
+		zstream->next_out = buf_getwriteptr(ret, zstream->avail_out);
+
+		result = inflate(zstream, Z_SYNC_FLUSH);
+
+		buf_setlen(ret, ret->size - zstream->avail_out);
+		buf_setpos(ret, ret->len);
+
+		if (result != Z_BUF_ERROR && result != Z_OK) {
+			dropbear_exit("zlib error");
+		}
+
+		if (zstream->avail_in == 0 &&
+		   		(zstream->avail_out != 0 || result == Z_BUF_ERROR)) {
+			/* we can only exit if avail_out hasn't all been used,
+			 * and there's no remaining input */
+			return ret;
+		}
+
+		if (zstream->avail_out == 0) {
+			int new_size = 0;
+			if (ret->size >= RECV_MAX_PAYLOAD_LEN) {
+				/* Already been increased as large as it can go,
+				 * yet didn't finish up the decompression */
+				dropbear_exit("bad packet, oversized decompressed");
+			}
+			new_size = MIN(RECV_MAX_PAYLOAD_LEN, ret->size + ZLIB_DECOMPRESS_INCR);
+			ret = buf_resize(ret, new_size);
+		}
 	}
-
-	buf_setlen(ret, ret->size - zstream->avail_out);
-
-	if (zstream->avail_in > 0 || ret->len > RECV_MAX_PAYLOAD_LEN) {
-		/* The remote side sent larger than a payload size
-		 * of uncompressed data.
-		 */
-		dropbear_exit("bad packet, oversized decompressed");
-	}
-
-	/* Success. All input was consumed and avail_out > 0 */
-	return ret;
-
 }
 #endif
 

release.sh

@@ -2,38 +2,18 @@
 
 set -e
 
-if [ "$1" = '--testrel' ]; then
-    # --testrel won't check changelog version correctness and will build in a temporary dir
-    TESTREL=1
-else
-    TESTREL=0
+VERSION=$(echo '#include "sysoptions.h"\necho DROPBEAR_VERSION' | cpp - | sh)
+echo Releasing version "$VERSION" ...
+if ! head -n1 CHANGES | grep -q $VERSION ; then
+	echo "CHANGES needs updating"
+	exit 1
 fi
 
-VERSION=$(echo '#include "default_options.h"\n#include "sysoptions.h"\necho DROPBEAR_VERSION' | cpp -DHAVE_CRYPT - | sh)
-
-if [ $TESTREL -eq 1 ]; then
-    echo Making test tarball for "$VERSION" ...
-    echo Not checking version mismatches.
-    WORKDIR=$(mktemp -d)
-    TARSUFFIX="-testrel"
-else
-    echo Releasing version "$VERSION" ...
-    if ! head -n1 CHANGES | grep -q $VERSION ; then
-        echo "CHANGES needs updating"
-        exit 1
-    fi
-
-    if ! head -n1 debian/changelog | grep -q $VERSION ; then
-        echo "debian/changelog needs updating"
-        exit 1
-    fi
-    WORKDIR=$PWD/..
-    TARSUFFIX=""
+if ! head -n1 debian/changelog | grep -q $VERSION ; then
+	echo "debian/changelog needs updating"
+	exit 1
 fi
 
-RELDIR=$WORKDIR/dropbear-$VERSION
-ARCHIVE=${RELDIR}${TARSUFFIX}.tar.bz2
-
 head -n1 CHANGES
 
 if tar --version | grep -q 'GNU tar'; then
@@ -42,6 +22,8 @@ else
 	TAR=gtar
 fi
 
+RELDIR=$PWD/../dropbear-$VERSION
+ARCHIVE=${RELDIR}.tar.bz2
 if test -e $RELDIR; then
 	echo "$RELDIR exists"
 	exit 1
@@ -52,18 +34,11 @@ if test -e $ARCHIVE; then
 	exit 1
 fi
 
-if [ -d .hg ]; then
-    hg archive "$RELDIR"  || exit 2
-    # .hg_archival.txt seems to differ between hg versions, isn't good for reproducibility
-    rm "$RELDIR/.hg_archival.txt"
-elif [ -d .git ]; then
-    git -c tar.umask=0022 archive --format tar -o /dev/stdout --prefix=dropbear-$VERSION/ HEAD | tar xf - -C $WORKDIR || exit 2
-else
-    echo "This isn't a hg or git checkout"
-    exit 1
-fi
+hg archive "$RELDIR"  || exit 2
 
-chmod -R a+rX $RELDIR
+rm "$RELDIR/.hgtags"
+# .hg_archival.txt seems to differ between hg versions, isn't good for reproducibility
+rm "$RELDIR/.hg_archival.txt"
 
 RELDATE=$(head -n1 CHANGES | cut -d - -f 2)
 # timezone keeps it consistent, choose a plausible release time
@@ -77,8 +52,5 @@ ls -l $ARCHIVE
 openssl sha256 $ARCHIVE
 echo Done to
 echo "$ARCHIVE"
-
-if [ $TESTREL -eq 0 ]; then
-    echo Sign it with
-    echo gpg2 --detach-sign -a -u F29C6773 "$ARCHIVE"
-fi
+echo Sign it with
+echo gpg2 --detach-sign -a -u F29C6773 "$ARCHIVE"

runopts.h

@@ -33,14 +33,13 @@
 
 typedef struct runopts {
 
-	int disable_ip_tos;
 #if DROPBEAR_SVR_REMOTETCPFWD || DROPBEAR_CLI_LOCALTCPFWD \
     || DROPBEAR_CLI_REMOTETCPFWD
 	int listen_fwd_all;
 #endif
 	unsigned int recv_window;
-	long keepalive_secs; /* Time between sending keepalives. 0 is off */
-	long idle_timeout_secs; /* Exit if no traffic is sent/received in this time */
+	time_t keepalive_secs; /* Time between sending keepalives. 0 is off */
+	time_t idle_timeout_secs; /* Exit if no traffic is sent/received in this time */
 	int usingsyslog;
 
 #ifndef DISABLE_ZLIB
@@ -73,16 +72,13 @@ typedef struct svr_runopts {
 
 	int forkbg;
 
-	/* ports and addresses are arrays of the portcount
+	/* ports and addresses are arrays of the portcount 
 	listening ports. strings are malloced. */
 	char *ports[DROPBEAR_MAX_PORTS];
 	unsigned int portcount;
 	char *addresses[DROPBEAR_MAX_PORTS];
 
 	int inetdmode;
-	/* Hidden "-2 childpipe_fd" flag indicates it's re-executing itself,
-	   stores the childpipe preauth file descriptor. Set to -1 otherwise. */
-	int reexec_childpipe;
 
 	/* Flags indicating whether to use ipv4 and ipv6 */
 	/* not used yet
@@ -94,6 +90,7 @@ typedef struct svr_runopts {
 	/* whether to print the MOTD */
 	int domotd;
 #endif
+
 	int norootlogin;
 
 #ifdef HAVE_GETGROUPLIST
@@ -107,7 +104,6 @@ typedef struct svr_runopts {
 	int noauthpass;
 	int norootpass;
 	int allowblankpass;
-	int multiauthmethod;
 	unsigned int maxauthtries;
 
 #if DROPBEAR_SVR_REMOTETCPFWD
@@ -130,10 +126,8 @@ typedef struct svr_runopts {
 	char * forced_command;
 
 #if DROPBEAR_PLUGIN 
-	/* malloced */
-	char *pubkey_plugin;
-	/* points into pubkey_plugin */
-	char *pubkey_plugin_options;
+        char *pubkey_plugin;
+        char *pubkey_plugin_options;
 #endif
 
 	int pass_on_env;
@@ -159,7 +153,6 @@ typedef struct cli_runopts {
 	int always_accept_key;
 	int no_hostkey_check;
 	int no_cmd;
-	int quiet;
 	int backgrounded;
 	int is_subsystem;
 #if DROPBEAR_CLI_PUBKEY_AUTH
@@ -203,6 +196,5 @@ void parse_ciphers_macs(void);
 
 void print_version(void);
 void parse_recv_window(const char* recv_window_arg);
-int split_address_port(const char* spec, char **first, char ** second);
 
 #endif /* DROPBEAR_RUNOPTS_H_ */

signkey.c

@@ -120,7 +120,6 @@ enum signkey_type signkey_type_from_name(const char* name, unsigned int namelen)
 /* Special case for rsa-sha2-256. This could be generalised if more 
    signature names are added that aren't 1-1 with public key names */
 const char* signature_name_from_type(enum signature_type type, unsigned int *namelen) {
-#if DROPBEAR_RSA
 #if DROPBEAR_RSA_SHA256
 	if (type == DROPBEAR_SIGNATURE_RSA_SHA256) {
 		if (namelen) {
@@ -137,13 +136,11 @@ const char* signature_name_from_type(enum signature_type type, unsigned int *nam
 		return SSH_SIGNKEY_RSA;
 	}
 #endif
-#endif /* DROPBEAR_RSA */
 	return signkey_name_from_type((enum signkey_type)type, namelen);
 }
 
 /* Returns DROPBEAR_SIGNATURE_NONE if none match */
 enum signature_type signature_type_from_name(const char* name, unsigned int namelen) {
-#if DROPBEAR_RSA
 #if DROPBEAR_RSA_SHA256
 	if (namelen == strlen(SSH_SIGNATURE_RSA_SHA256) 
 		&& memcmp(name, SSH_SIGNATURE_RSA_SHA256, namelen) == 0) {
@@ -156,11 +153,10 @@ enum signature_type signature_type_from_name(const char* name, unsigned int name
 		return DROPBEAR_SIGNATURE_RSA_SHA1;
 	}
 #endif
-#endif /* DROPBEAR_RSA */
 	return (enum signature_type)signkey_type_from_name(name, namelen);
 }
 
-/* Returns the signature type from a key type. Must not be called
+/* Returns the signature type from a key type. Must not be called 
    with RSA keytype */
 enum signature_type signature_type_from_signkey(enum signkey_type keytype) {
 #if DROPBEAR_RSA
@@ -171,7 +167,6 @@ enum signature_type signature_type_from_signkey(enum signkey_type keytype) {
 }
 
 enum signkey_type signkey_type_from_signature(enum signature_type sigtype) {
-#if DROPBEAR_RSA
 #if DROPBEAR_RSA_SHA256
 	if (sigtype == DROPBEAR_SIGNATURE_RSA_SHA256) {
 		return DROPBEAR_SIGNKEY_RSA;
@@ -182,7 +177,6 @@ enum signkey_type signkey_type_from_signature(enum signature_type sigtype) {
 		return DROPBEAR_SIGNKEY_RSA;
 	}
 #endif
-#endif /* DROPBEAR_RSA */
 	assert((int)sigtype < (int)DROPBEAR_SIGNKEY_NUM_NAMED);
 	return (enum signkey_type)sigtype;
 }
@@ -540,52 +534,104 @@ void sign_key_free(sign_key *key) {
 #endif
 
 	m_free(key->filename);
-#if DROPBEAR_SK_ECDSA || DROPBEAR_SK_ED25519
-	if (key->sk_app) {
-		m_free(key->sk_app);
-	}
-#endif
+	m_free(key->sk_app);
 
 	m_free(key);
 	TRACE2(("leave sign_key_free"))
 }
 
-static char * sign_key_sha256_fingerprint(const unsigned char* keyblob,
+static char hexdig(unsigned char x) {
+	if (x > 0xf)
+		return 'X';
+
+	if (x < 10)
+		return '0' + x;
+	else
+		return 'a' + x - 10;
+}
+
+/* Since we're not sure if we'll have md5 or sha1, we present both.
+ * MD5 is used in preference, but sha1 could still be useful */
+#if DROPBEAR_MD5_HMAC
+static char * sign_key_md5_fingerprint(const unsigned char* keyblob,
 		unsigned int keybloblen) {
 
 	char * ret;
 	hash_state hs;
-	unsigned char hash[SHA256_HASH_SIZE];
-	unsigned int b64chars, start;
-	unsigned long b64size;
-	const char *prefix = "SHA256:";
-	int err;
+	unsigned char hash[MD5_HASH_SIZE];
+	unsigned int i;
+	unsigned int buflen;
 
-	sha256_init(&hs);
-	sha256_process(&hs, keyblob, keybloblen);
-	sha256_done(&hs, hash);
+	md5_init(&hs);
 
-	/* eg "SHA256:P9szN0L2ls6KxkVv7Bppv3asnZCn03rY7Msm/c8+ZgA"
-	 * 256/6 = 42.66 => 43 base64 chars. OpenSSH discards
-	 * base64 padding output. */
-	start = strlen(prefix);
-	b64chars = 43;
-	/* space for discarded b64 padding and null terminator */
-	b64size = b64chars + 4;
-	ret = m_malloc(start + b64size);
+	/* skip the size int of the string - this is a bit messy */
+	md5_process(&hs, keyblob, keybloblen);
 
-	memcpy(ret, prefix, start);
-	err = base64_encode(hash, SHA256_HASH_SIZE, &ret[start], &b64size);
-	if (err != CRYPT_OK) {
-		dropbear_exit("base64 failed");
+	md5_done(&hs, hash);
+
+	/* "md5 hexfingerprinthere\0", each hex digit is "AB:" etc */
+	buflen = 4 + 3*MD5_HASH_SIZE;
+	ret = (char*)m_malloc(buflen);
+
+	memset(ret, 'Z', buflen);
+	strcpy(ret, "md5 ");
+
+	for (i = 0; i < MD5_HASH_SIZE; i++) {
+		unsigned int pos = 4 + i*3;
+		ret[pos] = hexdig(hash[i] >> 4);
+		ret[pos+1] = hexdig(hash[i] & 0x0f);
+		ret[pos+2] = ':';
 	}
-	ret[start + b64chars] = '\0';
+	ret[buflen-1] = 0x0;
+
 	return ret;
 }
 
-/* This will return a freshly malloced string */
+#else /* use SHA1 rather than MD5 for fingerprint */
+static char * sign_key_sha1_fingerprint(const unsigned char* keyblob,
+		unsigned int keybloblen) {
+
+	char * ret;
+	hash_state hs;
+	unsigned char hash[SHA1_HASH_SIZE];
+	unsigned int i;
+	unsigned int buflen;
+
+	sha1_init(&hs);
+
+	/* skip the size int of the string - this is a bit messy */
+	sha1_process(&hs, keyblob, keybloblen);
+
+	sha1_done(&hs, hash);
+
+	/* "sha1!! hexfingerprinthere\0", each hex digit is "AB:" etc */
+	buflen = 7 + 3*SHA1_HASH_SIZE;
+	ret = (char*)m_malloc(buflen);
+
+	strcpy(ret, "sha1 ");
+
+	for (i = 0; i < SHA1_HASH_SIZE; i++) {
+		unsigned int pos = 7 + 3*i;
+		ret[pos] = hexdig(hash[i] >> 4);
+		ret[pos+1] = hexdig(hash[i] & 0x0f);
+		ret[pos+2] = ':';
+	}
+	ret[buflen-1] = 0x0;
+
+	return ret;
+}
+
+#endif /* MD5/SHA1 switch */
+
+/* This will return a freshly malloced string, containing a fingerprint
+ * in either sha1 or md5 */
 char * sign_key_fingerprint(const unsigned char* keyblob, unsigned int keybloblen) {
-	return sign_key_sha256_fingerprint(keyblob, keybloblen);
+
+#if DROPBEAR_MD5_HMAC
+	return sign_key_md5_fingerprint(keyblob, keybloblen);
+#else
+	return sign_key_sha1_fingerprint(keyblob, keybloblen);
+#endif
 }
 
 void buf_put_sign(buffer* buf, sign_key *key, enum signature_type sigtype, 
@@ -593,7 +639,7 @@ void buf_put_sign(buffer* buf, sign_key *key, enum signature_type sigtype,
 	buffer *sigblob = buf_new(MAX_PUBKEY_SIZE);
 	enum signkey_type keytype = signkey_type_from_signature(sigtype);
 
-#if DEBUG_TRACE > DROPBEAR_VERBOSE_LEVEL
+#if DEBUG_TRACE
 	{
 		const char* signame = signature_name_from_type(sigtype, NULL);
 		TRACE(("buf_put_sign type %d %s", sigtype, signame));
@@ -647,6 +693,9 @@ int buf_verify(buffer * buf, sign_key *key, enum signature_type expect_sigtype,
 
 	TRACE(("enter buf_verify"))
 
+	printhex("buf", buf->data, buf->pos);
+	printhex("remw", &buf->data[buf->pos], buf->len-buf->pos);
+
 	buf_getint(buf); /* blob length */
 	type_name = buf_getstring(buf, &type_name_len);
 	sigtype = signature_type_from_name(type_name, type_name_len);
@@ -694,7 +743,7 @@ int buf_verify(buffer * buf, sign_key *key, enum signature_type expect_sigtype,
 	if (keytype == DROPBEAR_SIGNKEY_SK_ECDSA_NISTP256) {
 		ecc_key **eck = (ecc_key**)signkey_key_ptr(key, keytype);
 		if (eck && *eck) {
-			return buf_sk_ecdsa_verify(buf, *eck, data_buf, key->sk_app, key->sk_applen, key->sk_flags_mask);
+			return buf_sk_ecdsa_verify(buf, *eck, data_buf, key->sk_app, key->sk_applen);
 		}
 	}
 #endif
@@ -702,7 +751,7 @@ int buf_verify(buffer * buf, sign_key *key, enum signature_type expect_sigtype,
 	if (keytype == DROPBEAR_SIGNKEY_SK_ED25519) {
 		dropbear_ed25519_key **eck = (dropbear_ed25519_key**)signkey_key_ptr(key, keytype);
 		if (eck && *eck) {
-			return buf_sk_ed25519_verify(buf, *eck, data_buf, key->sk_app, key->sk_applen, key->sk_flags_mask);
+			return buf_sk_ed25519_verify(buf, *eck, data_buf, key->sk_app, key->sk_applen);
 		}
 	}
 #endif

signkey.h

@@ -79,14 +79,12 @@ enum signature_type {
 	DROPBEAR_SIGNATURE_SK_ED25519 = DROPBEAR_SIGNKEY_SK_ED25519,
 #endif
 #endif
-#if DROPBEAR_RSA
 #if DROPBEAR_RSA_SHA1
 	DROPBEAR_SIGNATURE_RSA_SHA1 = 100, /* ssh-rsa signature (sha1) */
 #endif
 #if DROPBEAR_RSA_SHA256
 	DROPBEAR_SIGNATURE_RSA_SHA256 = 101, /* rsa-sha2-256 signature. has a ssh-rsa key */
 #endif
-#endif /* DROPBEAR_RSA */
 	DROPBEAR_SIGNATURE_NONE = DROPBEAR_SIGNKEY_NONE,
 };
 
@@ -129,7 +127,6 @@ struct SIGN_key {
 	/* application ID for U2F/FIDO key types, a malloced string */
 	char * sk_app;
 	unsigned int sk_applen;
-	unsigned char sk_flags_mask;
 #endif
 };
 

signkey_ossh.c

@@ -1,161 +0,0 @@
-#include "includes.h"
-#include "dbutil.h"
-#include "ssh.h"
-#include "signkey_ossh.h"
-#include "bignum.h"
-#include "ecdsa.h"
-#include "sk-ecdsa.h"
-#include "sk-ed25519.h"
-#include "rsa.h"
-#include "dss.h"
-#include "ed25519.h"
-
-#if DROPBEAR_RSA
-/* OpenSSH raw private RSA format is
-string       "ssh-rsa"
-mpint        n
-mpint        e
-mpint        d
-mpint        iqmp   (q^-1) mod p
-mpint        p
-mpint        q
-*/
-
-void buf_put_rsa_priv_ossh(buffer *buf, const sign_key *akey) {
-	const dropbear_rsa_key *key = akey->rsakey;
-	mp_int iqmp;
-
-	dropbear_assert(key != NULL);
-	if (!(key->p && key->q)) {
-		dropbear_exit("Pre-0.33 Dropbear keys cannot be converted to OpenSSH keys.\n");
-	}
-
-	m_mp_init(&iqmp);
-	/* iqmp = (q^-1) mod p */
-	if (mp_invmod(key->q, key->p, &iqmp) != MP_OKAY) {
-		dropbear_exit("Bignum error for iqmp\n");
-	}
-	buf_putstring(buf, SSH_SIGNKEY_RSA, SSH_SIGNKEY_RSA_LEN);
-	buf_putmpint(buf, key->n);
-	buf_putmpint(buf, key->e);
-	buf_putmpint(buf, key->d);
-	buf_putmpint(buf, &iqmp);
-	buf_putmpint(buf, key->p);
-	buf_putmpint(buf, key->q);
-	mp_clear(&iqmp);
-}
-
-int buf_get_rsa_priv_ossh(buffer *buf, sign_key *akey) {
-	int ret = DROPBEAR_FAILURE;
-	dropbear_rsa_key *key = NULL;
-	mp_int iqmp;
-
-	rsa_key_free(akey->rsakey);
-	akey->rsakey = m_malloc(sizeof(*akey->rsakey));
-	key = akey->rsakey;
-	m_mp_alloc_init_multi(&key->e, &key->n, &key->d, &key->p, &key->q, NULL);
-
-	buf_eatstring(buf);
-	m_mp_init(&iqmp);
-	if (buf_getmpint(buf, key->n) == DROPBEAR_SUCCESS
-		&& buf_getmpint(buf, key->e) == DROPBEAR_SUCCESS
-		&& buf_getmpint(buf, key->d) == DROPBEAR_SUCCESS
-		&& buf_getmpint(buf, &iqmp) == DROPBEAR_SUCCESS
-		&& buf_getmpint(buf, key->p) == DROPBEAR_SUCCESS
-		&& buf_getmpint(buf, key->q) == DROPBEAR_SUCCESS) {
-		ret = DROPBEAR_SUCCESS;
-	}
-	mp_clear(&iqmp);
-	return ret;
-}
-
-#endif /* DROPBEAR_RSA */
-
-#if DROPBEAR_ED25519
-/* OpenSSH raw private ed25519 format is
-string       "ssh-ed25519"
-uint32       32
-byte[32]     pubkey
-uint32       64
-byte[32]     privkey
-byte[32]     pubkey
-*/
-
-void buf_put_ed25519_priv_ossh(buffer *buf, const sign_key *akey) {
-	const dropbear_ed25519_key *key = akey->ed25519key;
-	dropbear_assert(key != NULL);
-	buf_putstring(buf, SSH_SIGNKEY_ED25519, SSH_SIGNKEY_ED25519_LEN);
-	buf_putint(buf, CURVE25519_LEN);
-	buf_putbytes(buf, key->pub, CURVE25519_LEN);
-	buf_putint(buf, CURVE25519_LEN*2);
-	buf_putbytes(buf, key->priv, CURVE25519_LEN);
-	buf_putbytes(buf, key->pub, CURVE25519_LEN);
-}
-
-int buf_get_ed25519_priv_ossh(buffer *buf, sign_key *akey) {
-	dropbear_ed25519_key *key = NULL;
-	uint32_t len;
-
-	ed25519_key_free(akey->ed25519key);
-	akey->ed25519key = m_malloc(sizeof(*akey->ed25519key));
-	key = akey->ed25519key;
-
-	/* Parse past the first string and pubkey */
-	if (buf_get_ed25519_pub_key(buf, key, DROPBEAR_SIGNKEY_ED25519)
-			== DROPBEAR_FAILURE) {
-		dropbear_log(LOG_ERR, "Error parsing ed25519 key, pubkey");
-		return DROPBEAR_FAILURE;
-	}
-	len = buf_getint(buf);
-	if (len != 2*CURVE25519_LEN) {
-		dropbear_log(LOG_ERR, "Error parsing ed25519 key, bad length");
-		return DROPBEAR_FAILURE;
-	}
-	memcpy(key->priv, buf_getptr(buf, CURVE25519_LEN), CURVE25519_LEN);
-	buf_incrpos(buf, CURVE25519_LEN);
-
-	/* Sanity check */
-	if (memcmp(buf_getptr(buf, CURVE25519_LEN), key->pub,
-				CURVE25519_LEN) != 0) {
-		dropbear_log(LOG_ERR, "Error parsing ed25519 key, mismatch pubkey");
-		return DROPBEAR_FAILURE;
-	}
-	return DROPBEAR_SUCCESS;
-}
-#endif /* DROPBEAR_ED255219 */
-
-#if DROPBEAR_ECDSA
-/* OpenSSH raw private ecdsa format is the same as Dropbear's.
-# First part is the same as the SSH wire pubkey format
-string   "ecdsa-sha2-[identifier]"
-string   [identifier]
-string   Q
-# With private part appended
-mpint    d
-*/
-
-void buf_put_ecdsa_priv_ossh(buffer *buf, const sign_key *key) {
-	ecc_key **eck = (ecc_key**)signkey_key_ptr((sign_key*)key, key->type);
-	if (eck && *eck) {
-		buf_put_ecdsa_priv_key(buf, *eck);
-		return;
-	}
-	dropbear_exit("ecdsa key is not set");
-}
-
-int buf_get_ecdsa_priv_ossh(buffer *buf, sign_key *key) {
-	ecc_key **eck = (ecc_key**)signkey_key_ptr(key, key->type);
-	if (eck) {
-		if (*eck) {
-			ecc_free(*eck);
-			m_free(*eck);
-			*eck = NULL;
-		}
-		*eck = buf_get_ecdsa_priv_key(buf);
-		if (*eck) {
-			return DROPBEAR_SUCCESS;
-		}
-	}
-	return DROPBEAR_FAILURE;
-}
-#endif /* DROPBEAR_ECDSA */

signkey_ossh.h

@@ -1,15 +0,0 @@
-#ifndef DROPBEAR_SIGNKEY_OSSH_H_
-#define DROPBEAR_SIGNKEY_OSSH_H_
-
-#include "signkey.h"
-
-/* Helpers for OpenSSH format keys in dropbearconvert */
-
-void buf_put_rsa_priv_ossh(buffer *buf, const sign_key *akey);
-int buf_get_rsa_priv_ossh(buffer *buf, sign_key *akey);
-void buf_put_ed25519_priv_ossh(buffer *buf, const sign_key *akey);
-int buf_get_ed25519_priv_ossh(buffer *buf, sign_key *akey);
-void buf_put_ecdsa_priv_ossh(buffer *buf, const sign_key *akey);
-int buf_get_ecdsa_priv_ossh(buffer *buf, sign_key *akey);
-
-#endif /* DROPBEAR_SIGNKEY_OSSH_H_ */

sk-ecdsa.c

@@ -6,11 +6,8 @@
 #include "ecc.h"
 #include "ecdsa.h"
 #include "sk-ecdsa.h"
-#include "ssh.h"
 
-int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf,
-			const char* app, unsigned int applen,
-			unsigned char sk_flags_mask) {
+int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen) {
 	hash_state hs;
 	unsigned char subhash[SHA256_HASH_SIZE];
 	buffer *sk_buffer = NULL, *sig_buffer = NULL;
@@ -43,19 +40,6 @@ int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf,
 	buf_free(sk_buffer);
 	buf_free(sig_buffer);
 
-	if (~flags & sk_flags_mask & SSH_SK_USER_PRESENCE_REQD) {
-		if (ret == DROPBEAR_SUCCESS) {
-			dropbear_log(LOG_WARNING, "Rejecting, user-presence not set");
-		}
-		ret = DROPBEAR_FAILURE;
-	}
-	if (~flags & sk_flags_mask & SSH_SK_USER_VERIFICATION_REQD) {
-		if (ret == DROPBEAR_SUCCESS) {
-			dropbear_log(LOG_WARNING, "Rejecting, user-verification not set");
-		}
-		ret = DROPBEAR_FAILURE;
-	}
-
 	TRACE(("leave buf_sk_ecdsa_verify, ret=%d", ret))
 	return ret;
 }

sk-ecdsa.h

@@ -8,9 +8,7 @@
 #include "buffer.h"
 #include "signkey.h"
 
-int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf,
-			const char* app, unsigned int applen,
-			unsigned char sk_flags_mask);
+int buf_sk_ecdsa_verify(buffer *buf, const ecc_key *key, const buffer *data_buf, const char* app, unsigned int applen);
 
 #endif
 

sk-ed25519.c

@@ -6,11 +6,8 @@
 #include "buffer.h"
 #include "curve25519.h"
 #include "ed25519.h"
-#include "ssh.h"
 
-int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf,
-			const char* app, unsigned int applen,
-			unsigned char sk_flags_mask) {
+int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf, const char* app, unsigned int applen) {
 
 	int ret = DROPBEAR_FAILURE;
 	unsigned char *s;
@@ -34,7 +31,6 @@ int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const bu
 
 	flags = buf_getbyte (buf);
 	counter = buf_getint (buf);
-	/* create the message to be signed */
 	sk_buffer = buf_new (2*SHA256_HASH_SIZE+5);
 	sha256_init (&hs);
 	sha256_process (&hs, app, applen);
@@ -54,20 +50,10 @@ int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const bu
 		ret = DROPBEAR_SUCCESS;
 	}
 
-	if (~flags & sk_flags_mask & SSH_SK_USER_PRESENCE_REQD) {
-		if (ret == DROPBEAR_SUCCESS) {
-			dropbear_log(LOG_WARNING, "Rejecting, user-presence not set");
-		}
-		ret = DROPBEAR_FAILURE;
-	}
-	if (~flags & sk_flags_mask & SSH_SK_USER_VERIFICATION_REQD) {
-		if (ret == DROPBEAR_SUCCESS) {
-			dropbear_log(LOG_WARNING, "Rejecting, user-verification not set");
-		}
-		ret = DROPBEAR_FAILURE;
-	}
 out:
-	buf_free(sk_buffer);
+	if (sk_buffer) {
+		buf_free(sk_buffer);
+	}
 	TRACE(("leave buf_sk_ed25519_verify: ret %d", ret))
 	return ret;
 }

sk-ed25519.h

@@ -8,9 +8,7 @@
 #include "buffer.h"
 #include "ed25519.h"
 
-int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf,
-			const char* app, unsigned int applen,
-			unsigned char sk_flags_mask);
+int buf_sk_ed25519_verify(buffer *buf, const dropbear_ed25519_key *key, const buffer *data_buf, const char* app, unsigned int applen);
 
 #endif
 

ssh.h

@@ -126,8 +126,3 @@
 #define SSH2_AGENT_SIGN_RESPONSE		14
 
 #define SSH2_AGENT_FAILURE			30
-
-/* Flags defined by OpenSSH U2F key/signature format */
-#define SSH_SK_USER_PRESENCE_REQD       0x01
-#define SSH_SK_USER_VERIFICATION_REQD   0x04
-#define SSH_SK_RESIDENT_KEY             0x20

sshpty.c

@@ -380,9 +380,7 @@ pty_setowner(struct passwd *pw, const char *tty_name)
 				tty_name, strerror(errno));
 	}
 
-	/* Allow either "tty" gid or user's own gid. On Linux with openpty()
-	 * this varies depending on the devpts mount options */
-	if (st.st_uid != pw->pw_uid || !(st.st_gid == gid || st.st_gid == pw->pw_gid)) {
+	if (st.st_uid != pw->pw_uid || st.st_gid != gid) {
 		if (chown(tty_name, pw->pw_uid, gid) < 0) {
 			if (errno == EROFS &&
 			    (st.st_uid == pw->pw_uid || st.st_uid == 0)) {

svr-auth.c

@@ -389,7 +389,7 @@ void send_msg_userauth_failure(int partial, int incrfail) {
 		Beware of integer overflow if increasing these values */
 		const unsigned int mindelay = 250000000;
 		const unsigned int vardelay = 100000000;
-		suseconds_t rand_delay;
+		unsigned int rand_delay;
 		struct timespec delay;
 
 		gettime_wrapper(&delay);

svr-authpam.c

@@ -30,7 +30,6 @@
 #include "buffer.h"
 #include "dbutil.h"
 #include "auth.h"
-#include "runopts.h"
 
 #if DROPBEAR_SVR_PAM_AUTH
 
@@ -279,22 +278,12 @@ void svr_auth_pam(int valid_user) {
 		goto cleanup;
 	}
 
-	if (svr_opts.multiauthmethod && (ses.authstate.authtypes & ~AUTH_TYPE_PASSWORD)) {
-			/* successful PAM password authentication, but extra auth required */
-			dropbear_log(LOG_NOTICE,
-					"PAM password auth succeeded for '%s' from %s, extra auth required",
-					ses.authstate.pw_name,
-					svr_ses.addrstring);
-			ses.authstate.authtypes &= ~AUTH_TYPE_PASSWORD; /* PAM password auth ok, delete the method flag */
-			send_msg_userauth_failure(1, 0);  /* Send partial success */
-		} else {
-			/* successful authentication */
-			dropbear_log(LOG_NOTICE, "PAM password auth succeeded for '%s' from %s",
-				ses.authstate.pw_name,
-				svr_ses.addrstring);
-			send_msg_userauth_success();
-		}
-		
+	/* successful authentication */
+	dropbear_log(LOG_NOTICE, "PAM password auth succeeded for '%s' from %s",
+			ses.authstate.pw_name,
+			svr_ses.addrstring);
+	send_msg_userauth_success();
+
 cleanup:
 	if (password != NULL) {
 		m_burn(password, passwordlen);

svr-authpasswd.c

@@ -106,22 +106,12 @@ void svr_auth_password(int valid_user) {
 	}
 
 	if (constant_time_strcmp(testcrypt, passwdcrypt) == 0) {
-		if (svr_opts.multiauthmethod && (ses.authstate.authtypes & ~AUTH_TYPE_PASSWORD)) {
-			/* successful password authentication, but extra auth required */
-			dropbear_log(LOG_NOTICE,
-					"Password auth succeeded for '%s' from %s, extra auth required",
-					ses.authstate.pw_name,
-					svr_ses.addrstring);
-			ses.authstate.authtypes &= ~AUTH_TYPE_PASSWORD; /* password auth ok, delete the method flag */
-			send_msg_userauth_failure(1, 0);  /* Send partial success */
-		} else {
-			/* successful authentication */
-			dropbear_log(LOG_NOTICE, 
-					"Password auth succeeded for '%s' from %s",
-					ses.authstate.pw_name,
-					svr_ses.addrstring);
-			send_msg_userauth_success();
-		}
+		/* successful authentication */
+		dropbear_log(LOG_NOTICE, 
+				"Password auth succeeded for '%s' from %s",
+				ses.authstate.pw_name,
+				svr_ses.addrstring);
+		send_msg_userauth_success();
 	} else {
 		dropbear_log(LOG_WARNING,
 				"Bad password attempt for '%s' from %s",

svr-authpubkey.c

@@ -1,19 +1,19 @@
 /*
  * 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
@@ -22,11 +22,11 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  * SOFTWARE. */
 /*
- * This file incorporates work covered by the following copyright and
+ * This file incorporates work covered by the following copyright and  
  * permission notice:
  *
  * 	Copyright (c) 2000 Markus Friedl.  All rights reserved.
- *
+ * 	
  * 	Redistribution and use in source and binary forms, with or without
  * 	modification, are permitted provided that the following conditions
  * 	are met:
@@ -35,7 +35,7 @@
  * 	2. 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.
- *
+ * 	
  * 	THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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.
@@ -48,7 +48,7 @@
  * 	THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  * This copyright and permission notice applies to the code parsing public keys
- * options string which can also be found in OpenSSH auth2-pubkey.c file
+ * options string which can also be found in OpenSSH auth2-pubkey.c file 
  * (user_key_allowed2). It has been adapted to work with buffers.
  *
  */
@@ -64,7 +64,6 @@
 #include "ssh.h"
 #include "packet.h"
 #include "algo.h"
-#include "runopts.h"
 
 #if DROPBEAR_SVR_PUBKEY_AUTH
 
@@ -109,7 +108,7 @@ void svr_auth_pubkey(int valid_user) {
 
 	if (!valid_user) {
 		/* Return failure once we have read the contents of the packet
-		required to validate a public key.
+		required to validate a public key. 
 		Avoids blind user enumeration though it isn't possible to prevent
 		testing for user existence if the public key is known */
 		send_msg_userauth_failure(0, 0);
@@ -131,9 +130,9 @@ void svr_auth_pubkey(int valid_user) {
             if (svr_ses.plugin_instance->checkpubkey(
                         svr_ses.plugin_instance,
                         &ses.plugin_session,
-                        keyalgo,
-                        keyalgolen,
-                        keyblob,
+                        keyalgo, 
+                        keyalgolen, 
+                        keyblob, 
                         keybloblen,
                         ses.authstate.username) == DROPBEAR_SUCCESS) {
                 /* Success */
@@ -142,7 +141,7 @@ void svr_auth_pubkey(int valid_user) {
                 /* Options provided? */
                 options_buf = ses.plugin_session->get_options(ses.plugin_session);
                 if (options_buf) {
-                    struct buf temp_buf = {
+                    struct buf temp_buf = { 
                         .data = (unsigned char *)options_buf,
                         .len = strlen(options_buf),
                         .pos = 0,
@@ -175,7 +174,7 @@ void svr_auth_pubkey(int valid_user) {
 	}
 
 	/* now we can actually verify the signature */
-
+	
 	/* get the key */
 	key = new_sign_key();
 	if (buf_get_pub_key(ses.payload, key, &keytype) == DROPBEAR_FAILURE) {
@@ -183,16 +182,6 @@ void svr_auth_pubkey(int valid_user) {
 		goto out;
 	}
 
-#if DROPBEAR_SK_ECDSA || DROPBEAR_SK_ED25519
-	key->sk_flags_mask = SSH_SK_USER_PRESENCE_REQD;
-	if (ses.authstate.pubkey_options && ses.authstate.pubkey_options->no_touch_required_flag) {
-		key->sk_flags_mask &= ~SSH_SK_USER_PRESENCE_REQD;
-	}
-	if (ses.authstate.pubkey_options && ses.authstate.pubkey_options->verify_required_flag) {
-		key->sk_flags_mask |= SSH_SK_USER_VERIFICATION_REQD;
-	}
-#endif
-
 	/* create the data which has been signed - this a string containing
 	 * session_id, concatenated with the payload packet up to the signature */
 	assert(ses.payload_beginning <= ses.payload->pos);
@@ -202,7 +191,7 @@ void svr_auth_pubkey(int valid_user) {
 
 	/* The entire contents of the payload prior. */
 	buf_setpos(ses.payload, ses.payload_beginning);
-	buf_putbytes(signbuf,
+	buf_putbytes(signbuf, 
 		buf_getptr(ses.payload, sign_payload_length),
 		sign_payload_length);
 	buf_incrpos(ses.payload, sign_payload_length);
@@ -212,30 +201,17 @@ void svr_auth_pubkey(int valid_user) {
 	/* ... and finally verify the signature */
 	fp = sign_key_fingerprint(keyblob, keybloblen);
 	if (buf_verify(ses.payload, key, sigtype, signbuf) == DROPBEAR_SUCCESS) {
-		if (svr_opts.multiauthmethod && (ses.authstate.authtypes & ~AUTH_TYPE_PUBKEY)) {
-			/* successful pubkey authentication, but extra auth required */
-			dropbear_log(LOG_NOTICE,
-					"Pubkey auth succeeded for '%s' with %s key %s from %s, extra auth required",
-					ses.authstate.pw_name,
-					signkey_name_from_type(keytype, NULL), fp,
-					svr_ses.addrstring);
-			ses.authstate.authtypes &= ~AUTH_TYPE_PUBKEY; /* pubkey auth ok, delete the method flag */
-			send_msg_userauth_failure(1, 0); /* Send partial success */
-		} else {
-			/* successful authentication */
-			dropbear_log(LOG_NOTICE,
-					"Pubkey auth succeeded for '%s' with %s key %s from %s",
-					ses.authstate.pw_name,
-					signkey_name_from_type(keytype, NULL), fp,
-					svr_ses.addrstring);
-			send_msg_userauth_success();
-		}
+		dropbear_log(LOG_NOTICE,
+				"Pubkey auth succeeded for '%s' with key %s from %s",
+				ses.authstate.pw_name, fp, svr_ses.addrstring);
+		send_msg_userauth_success();
 #if DROPBEAR_PLUGIN
                 if ((ses.plugin_session != NULL) && (svr_ses.plugin_instance->auth_success != NULL)) {
                     /* Was authenticated through the external plugin. tell plugin that signature verification was ok */
                     svr_ses.plugin_instance->auth_success(ses.plugin_session);
                 }
 #endif
+                
 	} else {
 		dropbear_log(LOG_WARNING,
 				"Pubkey auth bad signature for '%s' with key %s from %s",
@@ -281,15 +257,11 @@ static void send_msg_userauth_pk_ok(const char* sigalgo, unsigned int sigalgolen
 
 }
 
-/* Content for SSH_PUBKEYINFO is optionally returned malloced in ret_info (will be
-   freed if already set */
 static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 		const char* algo, unsigned int algolen,
-		const unsigned char* keyblob, unsigned int keybloblen,
-		char ** ret_info) {
+		const unsigned char* keyblob, unsigned int keybloblen) {
 	buffer *options_buf = NULL;
-	char *info_str = NULL;
-	unsigned int pos, len, infopos, infolen;
+	unsigned int pos, len;
 	int ret = DROPBEAR_FAILURE;
 
 	if (line->len < MIN_AUTHKEYS_LINE || line->len > MAX_AUTHKEYS_LINE) {
@@ -312,7 +284,7 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 		unsigned char *options_start = NULL;
 		int options_len = 0;
 		int escape, quoted;
-
+		
 		/* skip over any comments or leading whitespace */
 		while (line->pos < line->len) {
 			const char c = buf_getbyte(line);
@@ -335,7 +307,7 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 		quoted = 0;
 		escape = 0;
 		options_len = 0;
-
+		
 		/* figure out where the options are */
 		while (line->pos < line->len) {
 			const char c = buf_getbyte(line);
@@ -360,43 +332,18 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 		}
 	}
 	buf_incrpos(line, algolen);
-
+	
 	/* check for space (' ') character */
 	if (buf_getbyte(line) != ' ') {
 		TRACE(("checkpubkey_line: space character expected, isn't there"))
 		goto out;
 	}
 
-	/* find the length of base64 data */
+	/* truncate the line at the space after the base64 data */
 	pos = line->pos;
 	for (len = 0; line->pos < line->len; len++) {
-		if (buf_getbyte(line) == ' ') {
-			break;
-		}
-	}
-
-	/* find out the length of the public key info, stop at the first space */
-	infopos = line->pos;
-	for (infolen = 0; line->pos < line->len; infolen++) {
-		const char c = buf_getbyte(line);
-		if (c == ' ') {
-			break;
-		}
-		/* We have an allowlist - authorized_keys lines can't be fully trusted,
-		some shell scripts may do unsafe things with env var values */
-		if (!(isalnum(c) || strchr(".,_-+@", c))) {
-			TRACE(("Not setting SSH_PUBKEYINFO, special characters"))
-			infolen = 0;
-			break;
-		}
-	}
-	if (infolen > 0) {
-		info_str = m_malloc(infolen + 1);
-		buf_setpos(line, infopos);
-        strncpy(info_str, buf_getptr(line, infolen), infolen);
-	}
-
-	/* truncate to base64 data length */
+		if (buf_getbyte(line) == ' ') break;
+	}	
 	buf_setpos(line, pos);
 	buf_setlen(line, line->pos + len);
 
@@ -404,30 +351,14 @@ static int checkpubkey_line(buffer* line, int line_num, const char* filename,
 
 	ret = cmp_base64_key(keyblob, keybloblen, (const unsigned char *) algo, algolen, line, NULL);
 
-	/* free pubkey_info if it is filled */
-	if (ret_info && *ret_info) {
-		m_free(*ret_info);
-		*ret_info = NULL;
-	}
-
-	if (ret == DROPBEAR_SUCCESS) {
-		if (options_buf) {
-			ret = svr_add_pubkey_options(options_buf, line_num, filename);
-		}
-		if (ret_info) {
-			/* take the (optional) public key information */
-			*ret_info = info_str;
-			info_str = NULL;
-		}
+	if (ret == DROPBEAR_SUCCESS && options_buf) {
+		ret = svr_add_pubkey_options(options_buf, line_num, filename);
 	}
 
 out:
 	if (options_buf) {
 		buf_free(options_buf);
 	}
-	if (info_str) {
-		m_free(info_str);
-	}
 	return ret;
 }
 
@@ -449,8 +380,23 @@ static int checkpubkey(const char* keyalgo, unsigned int keyalgolen,
 
 	TRACE(("enter checkpubkey"))
 
+	/* check file permissions, also whether file exists */
+	if (checkpubkeyperms() == DROPBEAR_FAILURE) {
+		TRACE(("bad authorized_keys permissions, or file doesn't exist"))
+		goto out;
+	}
+
+	/* we don't need to check pw and pw_dir for validity, since
+	 * its been done in checkpubkeyperms. */
+	len = strlen(ses.authstate.pw_dir);
+	/* allocate max required pathname storage,
+	 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
+	filename = m_malloc(len + 22);
+	snprintf(filename, len + 22, "%s/.ssh/authorized_keys", 
+				ses.authstate.pw_dir);
+
 #if DROPBEAR_SVR_MULTIUSER
-	/* access the file as the authenticating user. */
+	/* open the file as the authenticating user. */
 	origuid = getuid();
 	origgid = getgid();
 	if ((setegid(ses.authstate.pw_gid)) < 0 ||
@@ -458,24 +404,9 @@ static int checkpubkey(const char* keyalgo, unsigned int keyalgolen,
 		dropbear_exit("Failed to set euid");
 	}
 #endif
-	/* check file permissions, also whether file exists */
-	if (checkpubkeyperms() == DROPBEAR_FAILURE) {
-		TRACE(("bad authorized_keys permissions, or file doesn't exist"))
-	} else {
-		/* we don't need to check pw and pw_dir for validity, since
-		 * its been done in checkpubkeyperms. */
-		len = strlen(ses.authstate.pw_dir);
-		/* allocate max required pathname storage,
-		 * = path + "/.ssh/authorized_keys" + '\0' = pathlen + 22 */
-		filename = m_malloc(len + 22);
-		snprintf(filename, len + 22, "%s/.ssh/authorized_keys",
-					ses.authstate.pw_dir);
 
-		authfile = fopen(filename, "r");
-		if (!authfile) {
-			TRACE(("checkpubkey: failed opening %s: %s", filename, strerror(errno)))
-		}
-	}
+	authfile = fopen(filename, "r");
+
 #if DROPBEAR_SVR_MULTIUSER
 	if ((seteuid(origuid)) < 0 ||
 		(setegid(origgid)) < 0) {
@@ -500,13 +431,13 @@ static int checkpubkey(const char* keyalgo, unsigned int keyalgolen,
 		}
 		line_num++;
 
-		ret = checkpubkey_line(line, line_num, filename, keyalgo, keyalgolen,
-			keyblob, keybloblen, &ses.authstate.pubkey_info);
+		ret = checkpubkey_line(line, line_num, filename, keyalgo, keyalgolen, keyblob, keybloblen);
 		if (ret == DROPBEAR_SUCCESS) {
 			break;
 		}
 
 		/* We continue to the next line otherwise */
+		
 	} while (1);
 
 out:
@@ -529,7 +460,7 @@ out:
  * g-w, o-w */
 static int checkpubkeyperms() {
 
-	char* filename = NULL;
+	char* filename = NULL; 
 	int ret = DROPBEAR_FAILURE;
 	unsigned int len;
 
@@ -568,7 +499,7 @@ static int checkpubkeyperms() {
 
 	/* file looks ok, return success */
 	ret = DROPBEAR_SUCCESS;
-
+	
 out:
 	m_free(filename);
 
@@ -603,7 +534,7 @@ static int checkfileperm(char * filename) {
 	if (badperm) {
 		if (!ses.authstate.perm_warn) {
 			ses.authstate.perm_warn = 1;
-			dropbear_log(LOG_INFO, "%s must be owned by user or root, and not writable by group or others", filename);
+			dropbear_log(LOG_INFO, "%s must be owned by user or root, and not writable by others", filename);
 		}
 		TRACE(("leave checkfileperm: failure perms/owner"))
 		return DROPBEAR_FAILURE;
@@ -617,7 +548,7 @@ static int checkfileperm(char * filename) {
 int fuzz_checkpubkey_line(buffer* line, int line_num, char* filename,
 		const char* algo, unsigned int algolen,
 		const unsigned char* keyblob, unsigned int keybloblen) {
-	return checkpubkey_line(line, line_num, filename, algo, algolen, keyblob, keybloblen, NULL);
+	return checkpubkey_line(line, line_num, filename, algo, algolen, keyblob, keybloblen);
 }
 #endif
 

svr-authpubkeyoptions.c

@@ -46,7 +46,6 @@
 #include "dbutil.h"
 #include "signkey.h"
 #include "auth.h"
-#include "runopts.h"
 
 #if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
 
@@ -89,29 +88,6 @@ int svr_pubkey_allows_pty() {
 	return 1;
 }
 
-/* Returns 1 if pubkey allows local tcp fowarding to the provided destination,
- * 0 otherwise */
-int svr_pubkey_allows_local_tcpfwd(const char *host, unsigned int port) {
-	if (ses.authstate.pubkey_options
-		&& ses.authstate.pubkey_options->permit_open_destinations) {
-		m_list_elem *iter = ses.authstate.pubkey_options->permit_open_destinations->first;
-		while (iter) {
-			struct PermitTCPFwdEntry *entry = (struct PermitTCPFwdEntry*)iter->item;
-			if (strcmp(entry->host, host) == 0) {
-				if ((entry->port == PUBKEY_OPTIONS_ANY_PORT) || (entry->port == port)) {
-					return 1;
-				}
-			}
-
-			iter = iter->next;
-		}
-
-		return 0;
-	}
-
-	return 1;
-}
-
 /* Set chansession command to the one forced 
  * by any 'command' public key option. */
 void svr_pubkey_set_forced_command(struct ChanSess *chansess) {
@@ -137,21 +113,8 @@ void svr_pubkey_options_cleanup() {
 		if (ses.authstate.pubkey_options->forced_command) {
 			m_free(ses.authstate.pubkey_options->forced_command);
 		}
-		if (ses.authstate.pubkey_options->permit_open_destinations) {
-			m_list_elem *iter = ses.authstate.pubkey_options->permit_open_destinations->first;
-			while (iter) {
-				struct PermitTCPFwdEntry *entry = (struct PermitTCPFwdEntry*)list_remove(iter);
-				m_free(entry->host);
-				m_free(entry);
-				iter = ses.authstate.pubkey_options->permit_open_destinations->first;
-			}
-			m_free(ses.authstate.pubkey_options->permit_open_destinations);
-		}
 		m_free(ses.authstate.pubkey_options);
 	}
-	if (ses.authstate.pubkey_info) {
-		m_free(ses.authstate.pubkey_info);
-	}
 }
 
 /* helper for svr_add_pubkey_options. returns DROPBEAR_SUCCESS if the option is matched,
@@ -240,69 +203,6 @@ int svr_add_pubkey_options(buffer *options_buf, int line_num, const char* filena
 			goto bad_option;
 		}
 
-		if (match_option(options_buf, "permitopen=\"") == DROPBEAR_SUCCESS) {
-			int valid_option = 0;
-			const unsigned char* permitopen_start = buf_getptr(options_buf, 0);
-
-			if (!ses.authstate.pubkey_options->permit_open_destinations) {
-				ses.authstate.pubkey_options->permit_open_destinations = list_new();
-			}
-
-			while (options_buf->pos < options_buf->len) {
-				const char c = buf_getbyte(options_buf);
-				if (c == '"') {
-					char *spec = NULL;
-					char *portstring = NULL;
-					const int permitopen_len = buf_getptr(options_buf, 0) - permitopen_start;
-					struct PermitTCPFwdEntry *entry =
-							(struct PermitTCPFwdEntry*)m_malloc(sizeof(struct PermitTCPFwdEntry));
-
-					list_append(ses.authstate.pubkey_options->permit_open_destinations, entry);
-					spec = m_malloc(permitopen_len);
-					memcpy(spec, permitopen_start, permitopen_len - 1);
-					spec[permitopen_len - 1] = '\0';
-					if ((split_address_port(spec, &entry->host, &portstring) == DROPBEAR_SUCCESS)
-						&& entry->host && portstring) {
-						if (strcmp(portstring, "*") == 0) {
-							valid_option = 1;
-							entry->port = PUBKEY_OPTIONS_ANY_PORT;
-							TRACE(("local port forwarding allowed to host '%s'", entry->host));
-						} else if (m_str_to_uint(portstring, &entry->port) == DROPBEAR_SUCCESS) {
-							valid_option = 1;
-							TRACE(("local port forwarding allowed to host '%s' and port '%u'",
-									entry->host, entry->port));
-						}
-					}
-
-					m_free(spec);
-					m_free(portstring);
-					break;
-				}
-			}
-
-			if (valid_option) {
-				goto next_option;
-			} else {
-				dropbear_log(LOG_WARNING, "Badly formatted permitopen= authorized_keys option");
-				goto bad_option;
-			}
-		}
-
-		if (match_option(options_buf, "no-touch-required") == DROPBEAR_SUCCESS) {
-#if DROPBEAR_SK_ECDSA || DROPBEAR_SK_ED25519
-			dropbear_log(LOG_WARNING, "No user presence check required for U2F/FIDO key.");
-			ses.authstate.pubkey_options->no_touch_required_flag = 1;
-#endif
-			goto next_option;
-		}
-		if (match_option(options_buf, "verify-required") == DROPBEAR_SUCCESS) {
-#if DROPBEAR_SK_ECDSA || DROPBEAR_SK_ED25519
-			dropbear_log(LOG_WARNING, "User verification required for U2F/FIDO key.");
-			ses.authstate.pubkey_options->verify_required_flag = 1;
-#endif
-			goto next_option;
-		}
-
 next_option:
 		/*
 		 * Skip the comma, and move to the next option

svr-chansession.c

@@ -72,6 +72,9 @@ const struct ChanType svrchansess = {
 	cleanupchansess /* cleanup */
 };
 
+/* required to clear environment */
+extern char** environ;
+
 /* Returns whether the channel is ready to close. The child process
    must not be running (has never started, or has exited) */
 static int sesscheckclose(struct Channel *channel) {
@@ -274,8 +277,7 @@ static int newchansess(struct Channel *channel) {
 	chansess->agentdir = NULL;
 #endif
 
-	/* Will drop to DROPBEAR_PRIO_NORMAL if a non-tty command starts */
-	channel->prio = DROPBEAR_PRIO_LOWDELAY;
+	channel->prio = DROPBEAR_CHANNEL_PRIO_INTERACTIVE;
 
 	return 0;
 
@@ -685,10 +687,8 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
 		if (issubsys) {
 #if DROPBEAR_SFTPSERVER
 			if ((cmdlen == 4) && strncmp(chansess->cmd, "sftp", 4) == 0) {
-				char *expand_path = expand_homedir_path(SFTPSERVER_PATH);
 				m_free(chansess->cmd);
-				chansess->cmd = m_strdup(expand_path);
-				m_free(expand_path);
+				chansess->cmd = m_strdup(SFTPSERVER_PATH);
 			} else 
 #endif
 			{
@@ -734,7 +734,7 @@ static int sessioncommand(struct Channel *channel, struct ChanSess *chansess,
 		/* no pty */
 		ret = noptycommand(channel, chansess);
 		if (ret == DROPBEAR_SUCCESS) {
-			channel->prio = DROPBEAR_PRIO_NORMAL;
+			channel->prio = DROPBEAR_CHANNEL_PRIO_BULK;
 			update_channel_prio();
 		}
 	} else {
@@ -851,6 +851,7 @@ static int ptycommand(struct Channel *channel, struct ChanSess *chansess) {
 		 * the wtmp login will not be recorded */
 		li = chansess_login_alloc(chansess);
 		login_login(li);
+		dropbear_log(LOG_WARNING, "bad thing happened");
 		login_free_entry(li);
 
 		/* Can now dup2 stderr. Messages from login_login() have gone
@@ -873,11 +874,9 @@ static int ptycommand(struct Channel *channel, struct ChanSess *chansess) {
 			snprintf(hushpath, len, "%s/.hushlogin", ses.authstate.pw_dir);
 
 			if (stat(hushpath, &sb) < 0) {
-				char *expand_path = NULL;
 				/* more than a screenful is stupid IMHO */
 				motdbuf = buf_new(80 * 25);
-				expand_path = expand_homedir_path(MOTD_FILENAME);
-				if (buf_readfile(motdbuf, expand_path) == DROPBEAR_SUCCESS) {
+				if (buf_readfile(motdbuf, MOTD_FILENAME) == DROPBEAR_SUCCESS) {
 					buf_setpos(motdbuf, 0);
 					while (motdbuf->pos != motdbuf->len) {
 						len = motdbuf->len - motdbuf->pos;
@@ -886,9 +885,7 @@ static int ptycommand(struct Channel *channel, struct ChanSess *chansess) {
 						buf_incrpos(motdbuf, len);
 					}
 				}
-				m_free(expand_path);
 				buf_free(motdbuf);
-
 			}
 			m_free(hushpath);
 		}
@@ -1012,11 +1009,7 @@ static void execchild(const void *user_data) {
 	addnewvar("LOGNAME", ses.authstate.pw_name);
 	addnewvar("HOME", ses.authstate.pw_dir);
 	addnewvar("SHELL", get_user_shell());
-	if (getuid() == 0) {
-		addnewvar("PATH", DEFAULT_ROOT_PATH);
-	} else {
-		addnewvar("PATH", DEFAULT_PATH);
-	}
+	addnewvar("PATH", DEFAULT_PATH);
 	if (cp != NULL) {
 		addnewvar("LANG", cp);
 		m_free(cp);
@@ -1040,22 +1033,12 @@ static void execchild(const void *user_data) {
 	if (chansess->original_command) {
 		addnewvar("SSH_ORIGINAL_COMMAND", chansess->original_command);
 	}
-#if DROPBEAR_SVR_PUBKEY_OPTIONS_BUILT
-	if (ses.authstate.pubkey_info != NULL) {
-		addnewvar("SSH_PUBKEYINFO", ses.authstate.pubkey_info);
-	}
-#endif
 
 	/* change directory */
 	if (chdir(ses.authstate.pw_dir) < 0) {
-		int e = errno;
-		if (chdir("/") < 0) {
-			dropbear_exit("chdir(\"/\") failed");
-		}
-		fprintf(stderr, "Failed chdir '%s': %s\n", ses.authstate.pw_dir, strerror(e));
+		dropbear_exit("Error changing directory");
 	}
 
-
 #if DROPBEAR_X11FWD
 	/* set up X11 forwarding if enabled */
 	x11setauth(chansess);

svr-kex.c

@@ -106,7 +106,6 @@ void recv_msg_kexdh_init() {
 static void svr_ensure_hostkey() {
 
 	const char* fn = NULL;
-	char *expand_fn = NULL;
 	enum signkey_type type = ses.newkeys->algo_hostkey;
 	void **hostkey = signkey_key_ptr(svr_opts.hostkey, type);
 	int ret = DROPBEAR_FAILURE;
@@ -143,19 +142,15 @@ static void svr_ensure_hostkey() {
 			dropbear_assert(0);
 	}
 
-	expand_fn = expand_homedir_path(fn);
-
-	ret = readhostkey(expand_fn, svr_opts.hostkey, &type);
-	if (ret == DROPBEAR_SUCCESS) {
-		goto out;
+	if (readhostkey(fn, svr_opts.hostkey, &type) == DROPBEAR_SUCCESS) {
+		return;
 	}
 
-	if (signkey_generate(type, 0, expand_fn, 1) == DROPBEAR_FAILURE) {
+	if (signkey_generate(type, 0, fn, 1) == DROPBEAR_FAILURE) {
 		goto out;
 	}
 	
-	/* Read what we just generated (or another process raced us) */
-	ret = readhostkey(expand_fn, svr_opts.hostkey, &type);
+	ret = readhostkey(fn, svr_opts.hostkey, &type);
 
 	if (ret == DROPBEAR_SUCCESS) {
 		char *fp = NULL;
@@ -166,16 +161,16 @@ static void svr_ensure_hostkey() {
 		len = key_buf->len - key_buf->pos;
 		fp = sign_key_fingerprint(buf_getptr(key_buf, len), len);
 		dropbear_log(LOG_INFO, "Generated hostkey %s, fingerprint is %s",
-			expand_fn, fp);
+			fn, fp);
 		m_free(fp);
 		buf_free(key_buf);
 	}
 
 out:
-	if (ret == DROPBEAR_FAILURE) {
-		dropbear_exit("Couldn't read or generate hostkey %s", expand_fn);
+	if (ret == DROPBEAR_FAILURE)
+	{
+		dropbear_exit("Couldn't read or generate hostkey %s", fn);
 	}
-    m_free(expand_fn);
 }
 #endif
 	

svr-main.c

@@ -35,30 +35,26 @@ static size_t listensockets(int *sock, size_t sockcount, int *maxfd);
 static void sigchld_handler(int dummy);
 static void sigsegv_handler(int);
 static void sigintterm_handler(int fish);
+#if INETD_MODE
 static void main_inetd(void);
-static void main_noinetd(int argc, char ** argv, const char* multipath);
+#endif
+#if NON_INETD_MODE
+static void main_noinetd(void);
+#endif
 static void commonsetup(void);
 
 #if defined(DBMULTI_dropbear) || !DROPBEAR_MULTI
 #if defined(DBMULTI_dropbear) && DROPBEAR_MULTI
-int dropbear_main(int argc, char ** argv, const char* multipath)
+int dropbear_main(int argc, char ** argv)
 #else
 int main(int argc, char ** argv)
 #endif
 {
-#if !DROPBEAR_MULTI
-	const char* multipath = NULL;
-#endif
-
 	_dropbear_exit = svr_dropbear_exit;
 	_dropbear_log = svr_dropbear_log;
 
 	disallow_core();
 
-	if (argc < 1) {
-		dropbear_exit("Bad argc");
-	}
-
 	/* get commandline options */
 	svr_getopts(argc, argv);
 
@@ -70,21 +66,8 @@ int main(int argc, char ** argv)
 	}
 #endif
 
-#if DROPBEAR_DO_REEXEC
-	if (svr_opts.reexec_childpipe >= 0) {
-#ifdef PR_SET_NAME
-		/* Fix the "Name:" in /proc/pid/status, otherwise it's
-		a FD number from fexecve.
-		Failure doesn't really matter, it's mostly aesthetic */
-		prctl(PR_SET_NAME, basename(argv[0]), 0, 0);
-#endif
-		main_inetd();
-		/* notreached */
-	}
-#endif
-
 #if NON_INETD_MODE
-	main_noinetd(argc, argv, multipath);
+	main_noinetd();
 	/* notreached */
 #endif
 
@@ -93,7 +76,7 @@ int main(int argc, char ** argv)
 }
 #endif
 
-#if INETD_MODE || DROPBEAR_DO_REEXEC
+#if INETD_MODE
 static void main_inetd() {
 	char *host, *port = NULL;
 
@@ -102,28 +85,35 @@ static void main_inetd() {
 
 	seedrandom();
 
-	if (svr_opts.reexec_childpipe < 0) {
-		/* In case our inetd was lax in logging source addresses */
-		get_socket_address(0, NULL, NULL, &host, &port, 0);
-			dropbear_log(LOG_INFO, "Child connection from %s:%s", host, port);
-		m_free(host);
-		m_free(port);
-
-		/* Don't check the return value - it may just fail since inetd has
-		 * already done setsid() after forking (xinetd on Darwin appears to do
-		 * this */
-		setsid();
+#if DEBUG_TRACE
+	if (debug_trace) {
+		/* -v output goes to stderr which would get sent over the inetd network socket */
+		dropbear_exit("Dropbear inetd mode is incompatible with debug -v");
 	}
+#endif
 
-	/* -1 for childpipe in the inetd case is discarded */
-	svr_session(0, svr_opts.reexec_childpipe);
+	/* In case our inetd was lax in logging source addresses */
+	get_socket_address(0, NULL, NULL, &host, &port, 0);
+	dropbear_log(LOG_INFO, "Child connection from %s:%s", host, port);
+	m_free(host);
+	m_free(port);
+
+	/* Don't check the return value - it may just fail since inetd has
+	 * already done setsid() after forking (xinetd on Darwin appears to do
+	 * this */
+	setsid();
+
+	/* Start service program 
+	 * -1 is a dummy childpipe, just something we can close() without 
+	 * mattering. */
+	svr_session(0, -1);
 
 	/* notreached */
 }
 #endif /* INETD_MODE */
 
 #if NON_INETD_MODE
-static void main_noinetd(int argc, char ** argv, const char* multipath) {
+static void main_noinetd() {
 	fd_set fds;
 	unsigned int i, j;
 	int val;
@@ -131,7 +121,6 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 	int listensocks[MAX_LISTEN_ADDR];
 	size_t listensockcount = 0;
 	FILE *pidfile = NULL;
-	int execfd = -1;
 
 	int childpipes[MAX_UNAUTH_CLIENTS];
 	char * preauth_addrs[MAX_UNAUTH_CLIENTS];
@@ -139,10 +128,6 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 	int childsock;
 	int childpipe[2];
 
-	(void)argc;
-	(void)argv;
-	(void)multipath;
-
 	/* Note: commonsetup() must happen before we daemon()ise. Otherwise
 	   daemon() will chdir("/"), and we won't be able to find local-dir
 	   hostkeys. */
@@ -153,7 +138,7 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 		childpipes[i] = -1;
 	}
 	memset(preauth_addrs, 0x0, sizeof(preauth_addrs));
-
+	
 	/* Set up the listening sockets */
 	listensockcount = listensockets(listensocks, MAX_LISTEN_ADDR, &maxsock);
 	if (listensockcount == 0)
@@ -165,18 +150,6 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 		FD_SET(listensocks[i], &fds);
 	}
 
-#if DROPBEAR_DO_REEXEC
-	if (multipath) {
-		execfd = open(multipath, O_CLOEXEC|O_RDONLY);
-	} else {
-		execfd = open(argv[0], O_CLOEXEC|O_RDONLY);
-	}
-	if (execfd < 0) {
-		/* Just fallback to straight fork */
-		TRACE(("Couldn't open own binary %s, disabling re-exec: %s", argv[0], strerror(errno)))
-	}
-#endif
-
 	/* fork */
 	if (svr_opts.forkbg) {
 		int closefds = 0;
@@ -208,7 +181,7 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 	for(;;) {
 
 		DROPBEAR_FD_ZERO(&fds);
-
+		
 		/* listening sockets */
 		for (i = 0; i < listensockcount; i++) {
 			FD_SET(listensocks[i], &fds);
@@ -228,7 +201,7 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 			unlink(svr_opts.pidfile);
 			dropbear_exit("Terminated by signal");
 		}
-
+		
 		if (val == 0) {
 			/* timeout reached - shouldn't happen. eh */
 			continue;
@@ -313,7 +286,7 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 			}
 
 			addrandom((void*)&fork_ret, sizeof(fork_ret));
-
+			
 			if (fork_ret > 0) {
 
 				/* parent */
@@ -330,7 +303,7 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 				m_free(remote_host);
 				m_free(remote_port);
 
-#if !DEBUG_NOFORK
+#ifndef DEBUG_NOFORK
 				if (setsid() < 0) {
 					dropbear_exit("setsid: %s", strerror(errno));
 				}
@@ -343,44 +316,6 @@ static void main_noinetd(int argc, char ** argv, const char* multipath) {
 
 				m_close(childpipe[0]);
 
-				if (execfd >= 0) {
-#if DROPBEAR_DO_REEXEC
-					/* Add "-2 childpipe[1]" to the args and re-execute ourself. */
-					char **new_argv = m_malloc(sizeof(char*) * (argc+4));
-					char buf[10];
-					int pos0 = 0, new_argc = argc+2;
-
-					/* We need to specially handle "dropbearmulti dropbear". */
-					if (multipath) {
-						new_argv[0] = (char*)multipath;
-						pos0 = 1;
-						new_argc++;
-					}
-
-					memcpy(&new_argv[pos0], argv, sizeof(char*) * argc);
-					new_argv[new_argc-2] = "-2";
-					snprintf(buf, sizeof(buf), "%d", childpipe[1]);
-					new_argv[new_argc-1] = buf;
-					new_argv[new_argc] = NULL;
-
-					if ((dup2(childsock, STDIN_FILENO) < 0)) {
-						dropbear_exit("dup2 failed: %s", strerror(errno));
-					}
-					if (fcntl(childsock, F_SETFD, FD_CLOEXEC) < 0) {
-						TRACE(("cloexec for childsock %d failed: %s", childsock, strerror(errno)))
-					}
-					/* Re-execute ourself */
-					fexecve(execfd, new_argv, environ);
-					/* Not reached on success */
-
-					/* Fall back on plain fork otherwise.
-					 * To be removed in future once re-exec has been well tested */
-					dropbear_log(LOG_WARNING, "fexecve failed, disabling re-exec: %s", strerror(errno));
-					m_close(STDIN_FILENO);
-					m_free(new_argv);
-#endif /* DROPBEAR_DO_REEXEC */
-				}
-
 				/* start the session */
 				svr_session(childsock, childpipe[1]);
 				/* don't return */

svr-runopts.c

@@ -81,7 +81,6 @@ static void printhelp(const char * progname) {
 					"-s		Disable password logins\n"
 					"-g		Disable password logins for root\n"
 					"-B		Allow blank password logins\n"
-					"-t		Enable two-factor authentication (both password and public key required)\n"
 #endif
 					"-T		Maximum authentication tries (default %d)\n"
 #if DROPBEAR_SVR_LOCALTCPFWD
@@ -104,14 +103,13 @@ static void printhelp(const char * progname) {
 					"-W <receive_window_buffer> (default %d, larger may be faster, max 10MB)\n"
 					"-K <keepalive>  (0 is never, default %d, in seconds)\n"
 					"-I <idle_timeout>  (0 is never, default %d, in seconds)\n"
-					"-z    disable QoS\n"
 #if DROPBEAR_PLUGIN
                                         "-A <authplugin>[,<options>]\n"
                                         "               Enable external public key auth through <authplugin>\n"
 #endif
 					"-V    Version\n"
 #if DEBUG_TRACE
-					"-v    verbose (repeat for more verbose)\n"
+					"-v		verbose (compiled with DEBUG_TRACE)\n"
 #endif
 					,DROPBEAR_VERSION, progname,
 #if DROPBEAR_DSS
@@ -140,7 +138,6 @@ void svr_getopts(int argc, char ** argv) {
 	char* keepalive_arg = NULL;
 	char* idle_timeout_arg = NULL;
 	char* maxauthtries_arg = NULL;
-	char* reexec_fd_arg = NULL;
 	char* keyfile = NULL;
 	char c;
 #if DROPBEAR_PLUGIN
@@ -161,13 +158,12 @@ void svr_getopts(int argc, char ** argv) {
 	svr_opts.noauthpass = 0;
 	svr_opts.norootpass = 0;
 	svr_opts.allowblankpass = 0;
-	svr_opts.multiauthmethod = 0;
 	svr_opts.maxauthtries = MAX_AUTH_TRIES;
 	svr_opts.inetdmode = 0;
 	svr_opts.portcount = 0;
 	svr_opts.hostkey = NULL;
 	svr_opts.delay_hostkey = 0;
-	svr_opts.pidfile = expand_homedir_path(DROPBEAR_PIDFILE);
+	svr_opts.pidfile = DROPBEAR_PIDFILE;
 #if DROPBEAR_SVR_LOCALTCPFWD
 	svr_opts.nolocaltcp = 0;
 #endif
@@ -179,7 +175,6 @@ void svr_getopts(int argc, char ** argv) {
         svr_opts.pubkey_plugin_options = NULL;
 #endif
 	svr_opts.pass_on_env = 0;
-	svr_opts.reexec_childpipe = -1;
 
 #ifndef DISABLE_ZLIB
 	opts.compress_mode = DROPBEAR_COMPRESS_DELAYED;
@@ -202,7 +197,6 @@ void svr_getopts(int argc, char ** argv) {
 #if DROPBEAR_SVR_REMOTETCPFWD
 	opts.listen_fwd_all = 0;
 #endif
-	opts.disable_ip_tos = 0;
 
 	for (i = 1; i < (unsigned int)argc; i++) {
 		if (argv[i][0] != '-' || argv[i][1] == '\0')
@@ -252,16 +246,10 @@ void svr_getopts(int argc, char ** argv) {
 				case 'i':
 					svr_opts.inetdmode = 1;
 					break;
-#endif
-#if DROPBEAR_DO_REEXEC && NON_INETD_MODE
-				/* For internal use by re-exec */
-				case '2':
-					next = &reexec_fd_arg;
-					break;
 #endif
 				case 'p':
-					nextisport = 1;
-					break;
+				  nextisport = 1;
+				  break;
 				case 'P':
 					next = &svr_opts.pidfile;
 					break;
@@ -301,9 +289,6 @@ void svr_getopts(int argc, char ** argv) {
 				case 'B':
 					svr_opts.allowblankpass = 1;
 					break;
-				case 't':
-					svr_opts.multiauthmethod = 1;
-					break;
 #endif
 				case 'h':
 					printhelp(argv[0]);
@@ -319,16 +304,13 @@ void svr_getopts(int argc, char ** argv) {
 #endif
 #if DEBUG_TRACE
 				case 'v':
-					debug_trace++;
+					debug_trace = 1;
 					break;
 #endif
 				case 'V':
 					print_version();
 					exit(EXIT_SUCCESS);
 					break;
-				case 'z':
-					opts.disable_ip_tos = 1;
-					break;
 				default:
 					fprintf(stderr, "Invalid option -%c\n", c);
 					printhelp(argv[0]);
@@ -437,72 +419,70 @@ void svr_getopts(int argc, char ** argv) {
 	if (svr_opts.forced_command) {
 		dropbear_log(LOG_INFO, "Forced command set to '%s'", svr_opts.forced_command);
 	}
-
-	if (reexec_fd_arg) {
-		if (m_str_to_uint(reexec_fd_arg, &svr_opts.reexec_childpipe) == DROPBEAR_FAILURE
-			|| svr_opts.reexec_childpipe < 0) {
-			dropbear_exit("Bad -2");
-		}
-	}
-
-#if INETD_MODE
-	if (svr_opts.inetdmode && (
-		opts.usingsyslog == 0
-#if DEBUG_TRACE
-		|| debug_trace
-#endif
-		)) {
-		/* log output goes to stderr which would get sent over the inetd network socket */
-		dropbear_exit("Dropbear inetd mode is incompatible with debug -v or non-syslog");
-	}
-#endif
-
-	if (svr_opts.multiauthmethod && svr_opts.noauthpass) {
-		dropbear_exit("-t and -s are incompatible");
-	}
-
 #if DROPBEAR_PLUGIN
-	if (pubkey_plugin) {
-		svr_opts.pubkey_plugin = m_strdup(pubkey_plugin);
-		char *args = strchr(svr_opts.pubkey_plugin, ',');
-		if (args) {
-			*args='\0';
-			++args;
-		}
-		svr_opts.pubkey_plugin_options = args;
-	}
+        if (pubkey_plugin) {
+            char *args = strchr(pubkey_plugin, ',');
+            if (args) {
+                *args='\0';
+                ++args;
+            }
+            svr_opts.pubkey_plugin = pubkey_plugin;
+            svr_opts.pubkey_plugin_options = args;
+        }
 #endif
 }
 
 static void addportandaddress(const char* spec) {
-	char *port = NULL, *address = NULL;
+	char *spec_copy = NULL, *myspec = NULL, *port = NULL, *address = NULL;
 
-	if (svr_opts.portcount >= DROPBEAR_MAX_PORTS) {
-		return;
-	}
+	if (svr_opts.portcount < DROPBEAR_MAX_PORTS) {
 
-	if (split_address_port(spec, &address, &port) == DROPBEAR_FAILURE) {
-		dropbear_exit("Bad -p argument");
-	}
+		/* We don't free it, it becomes part of the runopt state */
+		spec_copy = m_strdup(spec);
+		myspec = spec_copy;
 
-	/* A bare port */
-	if (!port) {
-		port = address;
-		address = NULL;
-	}
+		if (myspec[0] == '[') {
+			myspec++;
+			port = strchr(myspec, ']');
+			if (!port) {
+				/* Unmatched [ -> exit */
+				dropbear_exit("Bad listen address");
+			}
+			port[0] = '\0';
+			port++;
+			if (port[0] != ':') {
+				/* Missing port -> exit */
+				dropbear_exit("Missing port");
+			}
+		} else {
+			/* search for ':', that separates address and port */
+			port = strrchr(myspec, ':');
+		}
 
-	if (!address) {
-		/* no address given -> fill in the default address */
-		address = m_strdup(DROPBEAR_DEFADDRESS);
-	}
+		if (!port) {
+			/* no ':' -> the whole string specifies just a port */
+			port = myspec;
+		} else {
+			/* Split the address/port */
+			port[0] = '\0'; 
+			port++;
+			address = myspec;
+		}
 
-	if (port[0] == '\0') {
-		/* empty port -> exit */
-		dropbear_exit("Bad port");
+		if (!address) {
+			/* no address given -> fill in the default address */
+			address = DROPBEAR_DEFADDRESS;
+		}
+
+		if (port[0] == '\0') {
+			/* empty port -> exit */
+			dropbear_exit("Bad port");
+		}
+		svr_opts.ports[svr_opts.portcount] = m_strdup(port);
+		svr_opts.addresses[svr_opts.portcount] = m_strdup(address);
+		svr_opts.portcount++;
+		m_free(spec_copy);
 	}
-	svr_opts.ports[svr_opts.portcount] = port;
-	svr_opts.addresses[svr_opts.portcount] = address;
-	svr_opts.portcount++;
 }
 
 static void disablekey(int type) {
@@ -531,14 +511,12 @@ static void loadhostkey_helper(const char *name, void** src, void** dst, int fat
 /* Must be called after syslog/etc is working */
 static void loadhostkey(const char *keyfile, int fatal_duplicate) {
 	sign_key * read_key = new_sign_key();
-	char *expand_path = expand_homedir_path(keyfile);
 	enum signkey_type type = DROPBEAR_SIGNKEY_ANY;
-	if (readhostkey(expand_path, read_key, &type) == DROPBEAR_FAILURE) {
+	if (readhostkey(keyfile, read_key, &type) == DROPBEAR_FAILURE) {
 		if (!svr_opts.delay_hostkey) {
-			dropbear_log(LOG_WARNING, "Failed loading %s", expand_path);
+			dropbear_log(LOG_WARNING, "Failed loading %s", keyfile);
 		}
 	}
-	m_free(expand_path);
 
 #if DROPBEAR_RSA
 	if (type == DROPBEAR_SIGNKEY_RSA) {

svr-session.c

@@ -208,7 +208,7 @@ void svr_session(int sock, int childpipe) {
 
 }
 
-/* cleanup and exit - format must be <= 100 chars */
+/* failure exit - format must be <= 100 chars */
 void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
 	char exitmsg[150];
 	char fullmsg[300];
@@ -217,12 +217,10 @@ void svr_dropbear_exit(int exitcode, const char* format, va_list param) {
 	int add_delay = 0;
 
 #if DROPBEAR_PLUGIN
-	if ((ses.plugin_session != NULL)) {
-		svr_ses.plugin_instance->delete_session(ses.plugin_session);
-	}
-	ses.plugin_session = NULL;
-	svr_opts.pubkey_plugin_options = NULL;
-	m_free(svr_opts.pubkey_plugin);
+        if ((ses.plugin_session != NULL)) {
+            svr_ses.plugin_instance->delete_session(ses.plugin_session);
+        }
+        ses.plugin_session = NULL;
 #endif
 
 	/* Render the formatted exit message */

svr-tcpfwd.c

@@ -60,7 +60,7 @@ static int newtcpdirect(struct Channel * channel);
 #if DROPBEAR_SVR_REMOTETCPFWD
 static const struct ChanType svr_chan_tcpremote = {
 	"forwarded-tcpip",
-	NULL,
+	tcp_prio_inithandler,
 	NULL,
 	NULL,
 	NULL,
@@ -289,15 +289,11 @@ static int newtcpdirect(struct Channel * channel) {
 		goto out;
 	}
 
-	if (!svr_pubkey_allows_local_tcpfwd(desthost, destport)) {
-		TRACE(("leave newtcpdirect: local tcp forwarding not permitted to requested destination"));
-		goto out;
-	}
+	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
 
 	snprintf(portstring, sizeof(portstring), "%u", destport);
-	channel->conn_pending = connect_remote(desthost, portstring, channel_connect_done,
-		channel, NULL, NULL, DROPBEAR_PRIO_NORMAL);
-
+	channel->conn_pending = connect_remote(desthost, portstring, channel_connect_done, channel, NULL, NULL);
+	
 	err = SSH_OPEN_IN_PROGRESS;
 
 out:

svr-x11fwd.c

@@ -206,7 +206,7 @@ void x11cleanup(struct ChanSess *chansess) {
 }
 
 static int x11_inithandler(struct Channel *channel) {
-	channel->prio = DROPBEAR_PRIO_LOWDELAY;
+	channel->prio = DROPBEAR_CHANNEL_PRIO_INTERACTIVE;
 	return 0;
 }
 

sysoptions.h

@@ -1,23 +1,15 @@
 /*******************************************************************
- * You shouldn't edit this file unless you know you need to.
+ * You shouldn't edit this file unless you know you need to. 
  * This file is only included from options.h
  *******************************************************************/
 
 #ifndef DROPBEAR_VERSION
-#define DROPBEAR_VERSION "2022.83"
+#define DROPBEAR_VERSION "2020.81"
 #endif
 
 #define LOCAL_IDENT "SSH-2.0-dropbear_" DROPBEAR_VERSION
 #define PROGNAME "dropbear"
 
-#ifndef DROPBEAR_CLIENT
-#define DROPBEAR_CLIENT 0
-#endif
-
-#ifndef DROPBEAR_SERVER
-#define DROPBEAR_SERVER 0
-#endif
-
 /* Spec recommends after one hour or 1 gigabyte of data. One hour
  * is a bit too verbose, so we try 8 hours */
 #ifndef KEX_REKEY_TIMEOUT
@@ -37,13 +29,6 @@
 	#error "NON_INETD_MODE or INETD_MODE (or both) must be enabled."
 #endif
 
-/* Would probably work on freebsd but hasn't been tested */
-#if defined(HAVE_FEXECVE) && DROPBEAR_REEXEC && defined(__linux__)
-#define DROPBEAR_DO_REEXEC 1
-#else
-#define DROPBEAR_DO_REEXEC 0
-#endif
-
 /* A client should try and send an initial key exchange packet guessing
  * the algorithm that will match - saves a round trip connecting, has little
  * overhead if the guess was "wrong". */
@@ -76,6 +61,7 @@
 #define MAX_TERM_LEN 200 /* max length of TERM name */
 
 #define MAX_HOST_LEN 254 /* max hostname len for tcp fwding */
+#define MAX_IP_LEN 15 /* strlen("255.255.255.255") == 15 */
 
 #define DROPBEAR_MAX_PORTS 10 /* max number of ports which can be specified,
 								 ipv4 and ipv6 don't count twice */
@@ -87,21 +73,12 @@
 
 #define _PATH_CP "/bin/cp"
 
-/* Default contents of /etc/shells if system getusershell() doesn't exist.
- * Paths taken from getusershell(3) manpage. These can be customised
- * on other platforms. One the commandline for CFLAGS it would look like eg
-  -DCOMPAT_USER_SHELLS='"/bin/sh","/apps/bin/sh","/data/bin/zsh"'
- */
-#ifndef COMPAT_USER_SHELLS
-#define COMPAT_USER_SHELLS "/bin/sh","/bin/csh"
-#endif
-
 #define DROPBEAR_ESCAPE_CHAR '~'
 
 /* success/failure defines */
 #define DROPBEAR_SUCCESS 0
 #define DROPBEAR_FAILURE -1
-
+ 
 #define DROPBEAR_PASSWORD_ENV "DROPBEAR_PASSWORD"
 
 #define DROPBEAR_NGROUP_MAX 1024
@@ -119,6 +96,7 @@
 
 #define SHA1_HASH_SIZE 20
 #define SHA256_HASH_SIZE 32
+#define MD5_HASH_SIZE 16
 #define MAX_HASH_SIZE 64 /* sha512 */
 
 #if DROPBEAR_CHACHA20POLY1305
@@ -141,11 +119,24 @@
 #define DROPBEAR_SHA2_512_HMAC 0
 #endif
 
+/* might be needed for compatibility with very old implementations */
+#ifndef DROPBEAR_MD5_HMAC
+#define DROPBEAR_MD5_HMAC 0
+#endif
+
+/* Twofish counter mode is disabled by default because it 
+has not been tested for interoperability with other SSH implementations.
+If you test it please contact the Dropbear author */
+#ifndef DROPBEAR_TWOFISH_CTR
+#define DROPBEAR_TWOFISH_CTR 0
+#endif
+
+
 #define DROPBEAR_ECC ((DROPBEAR_ECDH) || (DROPBEAR_ECDSA))
 
 /* Debian doesn't define this in system headers */
 #if !defined(LTM_DESC) && (DROPBEAR_ECC)
-#define LTM_DESC
+#define LTM_DESC 
 #endif
 
 #define DROPBEAR_ECC_256 (DROPBEAR_ECC)
@@ -159,42 +150,28 @@
  * signing operations slightly slower. */
 #define DROPBEAR_RSA_BLINDING 1
 
+#ifndef DROPBEAR_RSA_SHA1
+#define DROPBEAR_RSA_SHA1 DROPBEAR_RSA
+#endif
 #ifndef DROPBEAR_RSA_SHA256
 #define DROPBEAR_RSA_SHA256 DROPBEAR_RSA
 #endif
 
-/* Miller-Rabin primality testing is sufficient for RSA but not DSS.
- * It's a compile-time setting for libtommath, we can get a speedup
- * for key generation if DSS is disabled.
- * https://github.com/mkj/dropbear/issues/174#issuecomment-1267374858
- */
-#if !DROPBEAR_DSS
-#define LTM_USE_ONLY_MR 1
-#endif
-
 /* hashes which will be linked and registered */
-#define DROPBEAR_SHA1 (DROPBEAR_RSA_SHA1 || DROPBEAR_DSS \
-				|| DROPBEAR_SHA1_HMAC || DROPBEAR_SHA1_96_HMAC \
-				|| DROPBEAR_DH_GROUP1 || DROPBEAR_DH_GROUP14_SHA1 )
-/* sha256 is always used for fingerprints and dbrandom */
-#define DROPBEAR_SHA256 1
+#define DROPBEAR_SHA256 ((DROPBEAR_SHA2_256_HMAC) || (DROPBEAR_ECC_256) \
+ 			|| (DROPBEAR_CURVE25519) || (DROPBEAR_DH_GROUP14_SHA256) \
+			|| (DROPBEAR_RSA_SHA256))
 #define DROPBEAR_SHA384 (DROPBEAR_ECC_384)
 /* LTC SHA384 depends on SHA512 */
 #define DROPBEAR_SHA512 ((DROPBEAR_SHA2_512_HMAC) || (DROPBEAR_ECC_521) \
 			|| (DROPBEAR_SHA384) || (DROPBEAR_DH_GROUP16) \
 			|| (DROPBEAR_ED25519))
+#define DROPBEAR_MD5 (DROPBEAR_MD5_HMAC)
 
 #define DROPBEAR_DH_GROUP14 ((DROPBEAR_DH_GROUP14_SHA256) || (DROPBEAR_DH_GROUP14_SHA1))
 
 #define DROPBEAR_NORMAL_DH ((DROPBEAR_DH_GROUP1) || (DROPBEAR_DH_GROUP14) || (DROPBEAR_DH_GROUP16))
 
-#ifndef DROPBEAR_SK_ECDSA
-#define DROPBEAR_SK_ECDSA DROPBEAR_SK_KEYS
-#endif
-#ifndef DROPBEAR_SK_ED25519
-#define DROPBEAR_SK_ED25519 DROPBEAR_SK_KEYS
-#endif
-
 /* Dropbear only uses server-sig-algs, only needed if we have rsa-sha256 pubkey auth */
 #define DROPBEAR_EXT_INFO ((DROPBEAR_RSA_SHA256) \
 		&& ((DROPBEAR_CLI_PUBKEY_AUTH) || (DROPBEAR_SVR_PUBKEY_AUTH)))
@@ -251,6 +228,8 @@
 
 #define DROPBEAR_AES ((DROPBEAR_AES256) || (DROPBEAR_AES128))
 
+#define DROPBEAR_TWOFISH ((DROPBEAR_TWOFISH256) || (DROPBEAR_TWOFISH128))
+
 #define DROPBEAR_AEAD_MODE ((DROPBEAR_CHACHA20POLY1305) || (DROPBEAR_ENABLE_GCM_MODE))
 
 #define DROPBEAR_CLI_ANYTCPFWD ((DROPBEAR_CLI_REMOTETCPFWD) || (DROPBEAR_CLI_LOCALTCPFWD))
@@ -294,7 +273,8 @@
 	#error "You must define DROPBEAR_SVR_PUBKEY_AUTH in order to use plugins"
 #endif
 
-#if !(DROPBEAR_AES128 || DROPBEAR_3DES || DROPBEAR_AES256 || DROPBEAR_CHACHA20POLY1305)
+#if !(DROPBEAR_AES128 || DROPBEAR_3DES || DROPBEAR_AES256 || DROPBEAR_BLOWFISH \
+      || DROPBEAR_TWOFISH256 || DROPBEAR_TWOFISH128 || DROPBEAR_CHACHA20POLY1305)
 	#error "At least one encryption algorithm must be enabled. AES128 is recommended."
 #endif
 
@@ -379,20 +359,5 @@
 #define DROPBEAR_MSAN 0
 #endif
 
-#ifndef DEBUG_DSS_VERIFY
-#define DEBUG_DSS_VERIFY 0
-#endif
-
-#ifndef DROPBEAR_MULTI
-#define DROPBEAR_MULTI 0
-#endif
-
-/* Fuzzing expects all key types to be enabled */
-#if DROPBEAR_FUZZ
-#if defined(DROPBEAR_DSS)
-#undef DROPBEAR_DSS
-#endif
-#define DROPBEAR_DSS 1
-#endif
 
 /* no include guard for this file */

tcp-accept.c

@@ -45,6 +45,13 @@ static void cleanup_tcp(const struct Listener *listener) {
 	m_free(tcpinfo);
 }
 
+int tcp_prio_inithandler(struct Channel* channel)
+{
+	TRACE(("tcp_prio_inithandler channel %d", channel->index))
+	channel->prio = DROPBEAR_CHANNEL_PRIO_UNKNOWABLE;
+	return 0;
+}
+
 static void tcp_acceptor(const struct Listener *listener, int sock) {
 
 	int fd;

tcpfwd.h

@@ -71,6 +71,7 @@ void cli_recv_msg_request_failure(void);
 
 /* Common */
 int listen_tcpfwd(struct TCPListener* tcpinfo, struct Listener **ret_listener);
+int tcp_prio_inithandler(struct Channel* chan);
 
 /* A random identifier */
 #define CHANNEL_ID_TCPFORWARDED 0x43612c67

test/Makefile.in

@@ -1,14 +1,12 @@
 srcdir=@srcdir@
 
-SHELL=bash
-
 all: test
 
 test: venv/bin/pytest fakekey
-	(source ./venv/bin/activate; pytest --hostkey=fakekey --dbclient=../dbclient --dropbear=../dropbear $(srcdir) )
+	./venv/bin/pytest --hostkey=fakekey --dbclient=../dbclient --dropbear=../dropbear $(srcdir)
 
 one: venv/bin/pytest fakekey
-	(source ./venv/bin/activate; pytest --hostkey=fakekey --dbclient=../dbclient --dropbear=../dropbear $(srcdir) -k exit)
+	./venv/bin/pytest --hostkey=fakekey --dbclient=../dbclient --dropbear=../dropbear $(srcdir) -k exit
 
 fakekey:
 	../dropbearkey -t ecdsa -f $@

test/conftest.py

@@ -2,12 +2,9 @@ def pytest_addoption(parser):
     parser.addoption("--port", type=str, help="default is 2244 local, 22 remote")
     parser.addoption("--dbclient", type=str, default="../dbclient")
     parser.addoption("--dropbear", type=str, default="../dropbear")
-    parser.addoption("--dropbearconvert", type=str, default="../dropbearconvert")
-    parser.addoption("--dropbearkey", type=str, default="../dropbearkey")
     parser.addoption("--hostkey", type=str, help="required unless --remote")
     parser.addoption("--remote", type=str, help="remote host")
     parser.addoption("--user", type=str, help="optional username")
-    parser.addoption("--ssh-keygen", type=str, default="ssh-keygen")
 
 def pytest_configure(config):
     opt = config.option

test/parent_dropbear_map.py

@@ -1,41 +0,0 @@
-#!/usr/bin/env python3
-
-import os
-import sys
-import time
-import psutil
-
-from pathlib import Path
-
-
-want_name = "dropbear"
-# Walks up the parent process tree, prints a r-xp line of /proc/pid/maps when
-# it finds the wanted name
-
-def main():
-
-	try:
-		for p in psutil.Process().parents():
-			print(p.pid, file=sys.stderr)
-			print(p.name(), file=sys.stderr)
-			print(p.cmdline(), file=sys.stderr)
-
-			if want_name in p.name():
-				with (Path('/proc') / str(p.pid) / "maps").open() as f:
-					for i, l in enumerate(f, 1):
-						if ' r-xp ' in l:
-							print(l.rstrip())
-							break
-				return
-
-		raise RuntimeError(f"Couldn't find parent {want_name} process")
-	except Exception as e:
-		print(psutil.Process().parents())
-		for p in psutil.Process().parents():
-			print(p.name())
-		print(e)
-		# time.sleep(100)
-		raise
-
-if __name__ == "__main__":
-	main()

test/requirements.txt

@@ -6,4 +6,3 @@ py==1.10.0
 pyparsing==2.4.7
 pytest==6.2.5
 toml==0.10.2
-psutil==5.9.0

test/test_aslr.py

@@ -1,37 +0,0 @@
-from pathlib import Path
-import sys
-
-from test_dropbear import *
-
-def test_reexec(request, dropbear):
-	"""
-	Tests that two consecutive connections have different address layouts.
-	This indicates that re-exec makes ASLR work
-	"""
-	map_script = (Path(request.node.fspath).parent / "parent_dropbear_map.py").resolve()
-	# run within the same venv, for python deps
-	activate = own_venv_command()
-	cmd = f"{activate}; {map_script}"
-	print(cmd)
-	r = dbclient(request, cmd, capture_output=True, text=True)
-	map1 = r.stdout.rstrip()
-	print(r.stderr, file=sys.stderr)
-	r.check_returncode()
-
-	r = dbclient(request, cmd, capture_output=True, text=True)
-	map2 = r.stdout.rstrip()
-	print(r.stderr, file=sys.stderr)
-	r.check_returncode()
-
-	print(map1)
-	print(map2)
-	# expect something like
-	# "563174d59000-563174d5d000 r--p 00000000 00:29 4242372                    /home/matt/src/dropbear/build/dropbear"
-	assert map1.endswith('/dropbear') or map1.endswith('/dropbearmulti')
-	a1 = map1.split()[0]
-	a2 = map2.split()[0]
-	print(a1)
-	print(a2)
-	# relocation addresses should differ
-	assert a1 != a2
-