Mercurial > dropbear
view fuzzer-verify.c @ 1665:7c17995bcdfb
Improve address logging on early exit messages (#83)
Change 'Early exit' and 'Exit before auth' messages to include the IP
address & port as part of the message.
This allows log scanning utilities such as 'fail2ban' to obtain the
offending IP address as part of the failure event instead of extracting
the PID from the message and then scanning the log again for match
'child connection from' messages
Signed-off-by: Kevin Darbyshire-Bryant <[email protected]>
author | Kevin Darbyshire-Bryant <6500011+ldir-EDB0@users.noreply.github.com> |
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date | Wed, 18 Mar 2020 15:28:56 +0000 |
parents | f52919ffd3b1 |
children | ae41624c2198 |
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#include "fuzz.h" #include "session.h" #include "fuzz-wrapfd.h" #include "debug.h" static void setup_fuzzer(void) { fuzz_common_setup(); } static buffer *verifydata; /* Tests reading a public key and verifying a signature */ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) { static int once = 0; if (!once) { setup_fuzzer(); verifydata = buf_new(30); buf_putstring(verifydata, "x", 1); once = 1; } if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) { return 0; } m_malloc_set_epoch(1); if (setjmp(fuzz.jmp) == 0) { sign_key *key = new_sign_key(); enum signkey_type type = DROPBEAR_SIGNKEY_ANY; if (buf_get_pub_key(fuzz.input, key, &type) == DROPBEAR_SUCCESS) { if (buf_verify(fuzz.input, key, verifydata) == DROPBEAR_SUCCESS) { /* The fuzzer is capable of generating keys with a signature to match. We don't want false positives if the key is bogus, since a client/server wouldn't be trusting a bogus key anyway */ int boguskey = 0; if (type == DROPBEAR_SIGNKEY_DSS) { /* So far have seen dss keys with bad p/q/g domain parameters */ int pprime, qprime, trials; trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->p)); assert(mp_prime_is_prime(key->dsskey->p, trials, &pprime) == MP_OKAY); trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->q)); assert(mp_prime_is_prime(key->dsskey->q, trials, &qprime) == MP_OKAY); boguskey = !(pprime && qprime); /* Could also check g**q mod p == 1 */ } if (!boguskey) { printf("Random key/signature managed to verify!\n"); abort(); } } } sign_key_free(key); m_malloc_free_epoch(1, 0); } else { m_malloc_free_epoch(1, 1); TRACE(("dropbear_exit longjmped")) /* dropbear_exit jumped here */ } return 0; }