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annotate fuzzer-verify.c @ 1676:d5cdc60db08e

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ext-info handling for server-sig-algs only client side is handled
author Matt Johnston <matt@ucc.asn.au>
date Tue, 19 May 2020 00:31:41 +0800
parents ae41624c2198
children e01f9ec6d177
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1 #include "fuzz.h"
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2 #include "session.h"
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3 #include "fuzz-wrapfd.h"
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4 #include "debug.h"
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5
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6 static void setup_fuzzer(void) {
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7 fuzz_common_setup();
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8 }
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9
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10 static buffer *verifydata;
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11
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12 /* Tests reading a public key and verifying a signature */
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13 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
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14 static int once = 0;
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15 if (!once) {
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16 setup_fuzzer();
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17 verifydata = buf_new(30);
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18 buf_putstring(verifydata, "x", 1);
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19 once = 1;
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20 }
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21
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22 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
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23 return 0;
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24 }
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25
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26 m_malloc_set_epoch(1);
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27
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28 if (setjmp(fuzz.jmp) == 0) {
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29 sign_key *key = new_sign_key();
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30 enum signkey_type keytype = DROPBEAR_SIGNKEY_ANY;
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31 if (buf_get_pub_key(fuzz.input, key, &keytype) == DROPBEAR_SUCCESS) {
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32 enum signature_type sigtype;
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33 if (keytype == DROPBEAR_SIGNKEY_RSA) {
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34 /* Flip a coin to decide rsa signature type */
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35 int flag = buf_getbyte(fuzz_input);
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36 if (flag & 0x01) {
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37 sigtype = DROPBEAR_SIGNATURE_RSA_SHA256;
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38 } else {
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39 sigtype = DROPBEAR_SIGNATURE_RSA_SHA1;
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40 }
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41 } else {
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42 sigtype = signature_type_from_signkey(keytype);
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43 }
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44 if (buf_verify(fuzz.input, key, sigtype, verifydata) == DROPBEAR_SUCCESS) {
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45 /* The fuzzer is capable of generating keys with a signature to match.
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46 We don't want false positives if the key is bogus, since a client/server
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47 wouldn't be trusting a bogus key anyway */
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48 int boguskey = 0;
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49
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50 if (keytype == DROPBEAR_SIGNKEY_DSS) {
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51 /* So far have seen dss keys with bad p/q/g domain parameters */
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52 int pprime, qprime, trials;
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53 trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->p));
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54 assert(mp_prime_is_prime(key->dsskey->p, trials, &pprime) == MP_OKAY);
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55 trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->q));
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56 assert(mp_prime_is_prime(key->dsskey->q, trials, &qprime) == MP_OKAY);
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57 boguskey = !(pprime && qprime);
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58 /* Could also check g**q mod p == 1 */
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59 }
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60
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61 if (!boguskey) {
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62 printf("Random key/signature managed to verify!\n");
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63 abort();
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64 }
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66
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67 }
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68 }
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69 sign_key_free(key);
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70 m_malloc_free_epoch(1, 0);
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71 } else {
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72 m_malloc_free_epoch(1, 1);
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73 TRACE(("dropbear_exit longjmped"))
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74 /* dropbear_exit jumped here */
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75 }
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76
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77 return 0;
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78 }