mirror of
https://github.com/clearml/dropbear
synced 2025-01-31 02:46:58 +00:00
b8352f8164
Hopefully this can avoid hitting AFL timeouts https://github.com/google/oss-fuzz/pull/2474
70 lines
1.8 KiB
C
70 lines
1.8 KiB
C
#include "fuzz.h"
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#include "session.h"
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#include "fuzz-wrapfd.h"
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#include "debug.h"
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#include "runopts.h"
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#include "algo.h"
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#include "bignum.h"
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static struct key_context* keep_newkeys = NULL;
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/* An arbitrary limit */
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#define NUM_PARAMS 80
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static struct kex_curve25519_param *curve25519_params[NUM_PARAMS];
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static void setup() __attribute__((constructor));
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// Perform initial setup here to avoid hitting timeouts on first run
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static void setup() {
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fuzz_common_setup();
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fuzz_svr_setup();
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keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context));
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keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256");
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keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519;
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ses.newkeys = keep_newkeys;
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/* Pre-generate parameters */
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int i;
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for (i = 0; i < NUM_PARAMS; i++) {
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curve25519_params[i] = gen_kexcurve25519_param();
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}
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}
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int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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return 0;
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}
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m_malloc_set_epoch(1);
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if (setjmp(fuzz.jmp) == 0) {
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/* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply()
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with DROPBEAR_KEX_CURVE25519 */
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ses.newkeys = keep_newkeys;
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/* Choose from the collection of curve25519 params */
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unsigned int e = buf_getint(fuzz.input);
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struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS];
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buffer * ecdh_qs = buf_getstringbuf(fuzz.input);
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ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS);
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kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey);
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mp_clear(ses.dh_K);
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m_free(ses.dh_K);
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buf_free(ecdh_qs);
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buf_free(ses.hash);
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buf_free(ses.session_id);
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/* kexhashbuf is freed in kexdh_comb_key */
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m_malloc_free_epoch(1, 0);
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} else {
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m_malloc_free_epoch(1, 1);
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TRACE(("dropbear_exit longjmped"))
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/* dropbear_exit jumped here */
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}
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return 0;
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}
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