Mercurial > dropbear
view fuzz/fuzzer-kexcurve25519.c @ 1779:36d4c027cba7
fuzzing: add workaround getpwuid/getpwnam
author | Matt Johnston <matt@ucc.asn.au> |
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date | Mon, 16 Nov 2020 22:44:30 +0800 |
parents | 0cc85b4a4abb |
children |
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#include "fuzz.h" #include "session.h" #include "fuzz-wrapfd.h" #include "debug.h" #include "runopts.h" #include "algo.h" #include "bignum.h" static struct key_context* keep_newkeys = NULL; /* An arbitrary limit */ #define NUM_PARAMS 80 static struct kex_curve25519_param *curve25519_params[NUM_PARAMS]; static void setup() __attribute__((constructor)); // Perform initial setup here to avoid hitting timeouts on first run static void setup() { fuzz_common_setup(); fuzz_svr_setup(); keep_newkeys = (struct key_context*)m_malloc(sizeof(struct key_context)); keep_newkeys->algo_kex = fuzz_get_algo(sshkex, "curve25519-sha256"); keep_newkeys->algo_hostkey = DROPBEAR_SIGNKEY_ED25519; ses.newkeys = keep_newkeys; /* Pre-generate parameters */ int i; for (i = 0; i < NUM_PARAMS; i++) { curve25519_params[i] = gen_kexcurve25519_param(); } } int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) { return 0; } m_malloc_set_epoch(1); if (setjmp(fuzz.jmp) == 0) { /* Based on recv_msg_kexdh_init()/send_msg_kexdh_reply() with DROPBEAR_KEX_CURVE25519 */ ses.newkeys = keep_newkeys; /* Choose from the collection of curve25519 params */ unsigned int e = buf_getint(fuzz.input); struct kex_curve25519_param *curve25519_param = curve25519_params[e % NUM_PARAMS]; buffer * ecdh_qs = buf_getstringbuf(fuzz.input); ses.kexhashbuf = buf_new(KEXHASHBUF_MAX_INTS); kexcurve25519_comb_key(curve25519_param, ecdh_qs, svr_opts.hostkey); mp_clear(ses.dh_K); m_free(ses.dh_K); buf_free(ecdh_qs); buf_free(ses.hash); buf_free(ses.session_id); /* kexhashbuf is freed in kexdh_comb_key */ m_malloc_free_epoch(1, 0); } else { m_malloc_free_epoch(1, 1); TRACE(("dropbear_exit longjmped")) /* dropbear_exit jumped here */ } return 0; }