Mercurial > dropbear

annotate fuzzer-verify.c @ 1675:ae41624c2198

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
split signkey_type and signature_type for RSA sha1 vs sha256
author Matt Johnston <matt@ucc.asn.au>
date Sun, 17 May 2020 23:58:31 +0800
parents f52919ffd3b1
children d5cdc60db08e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1380
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 #include "fuzz.h"
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 #include "session.h"
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 #include "fuzz-wrapfd.h"
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 #include "debug.h"
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 static void setup_fuzzer(void) {
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1380
diff changeset
7 fuzz_common_setup();
1380
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 }
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 static buffer *verifydata;
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12 /* Tests reading a public key and verifying a signature */
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14 static int once = 0;
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 if (!once) {
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16 setup_fuzzer();
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 verifydata = buf_new(30);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 buf_putstring(verifydata, "x", 1);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 once = 1;
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 }
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21
1456
a90fdd2d2ed8 add fuzzer-preauth_nomaths
Matt Johnston <matt@ucc.asn.au>
parents: 1380
diff changeset
22 if (fuzz_set_input(Data, Size) == DROPBEAR_FAILURE) {
1380
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 return 0;
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24 }
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 m_malloc_set_epoch(1);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28 if (setjmp(fuzz.jmp) == 0) {
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 sign_key *key = new_sign_key();
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
30 enum signkey_type keytype = DROPBEAR_SIGNKEY_ANY;
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
31 if (buf_get_pub_key(fuzz.input, key, &keytype) == DROPBEAR_SUCCESS) {
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
32 enum signature_type sigtype = (enum signature_type)keytype;
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
33 if (keytype == DROPBEAR_SIGNKEY_RSA) {
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
34 /* Flip a coin to decide rsa signature type */
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
35 int flag = buf_getbyte(fuzz_input);
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
36 if (flag & 0x01) {
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
37 sigtype = DROPBEAR_SIGNATURE_RSA_SHA256;
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
38 } else {
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
39 sigtype = DROPBEAR_SIGNATURE_RSA_SHA1;
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
40 }
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
41 }
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
42 if (buf_verify(fuzz.input, key, sigtype, verifydata) == DROPBEAR_SUCCESS) {
1529
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
43 /* The fuzzer is capable of generating keys with a signature to match.
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
44 We don't want false positives if the key is bogus, since a client/server
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
45 wouldn't be trusting a bogus key anyway */
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
46 int boguskey = 0;
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
47
1675
ae41624c2198 split signkey_type and signature_type for RSA sha1 vs sha256
Matt Johnston <matt@ucc.asn.au>
parents: 1655
diff changeset
48 if (keytype == DROPBEAR_SIGNKEY_DSS) {
1529
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
49 /* So far have seen dss keys with bad p/q/g domain parameters */
1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
50 int pprime, qprime, trials;
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
51 trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->p));
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
52 assert(mp_prime_is_prime(key->dsskey->p, trials, &pprime) == MP_OKAY);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
53 trials = mp_prime_rabin_miller_trials(mp_count_bits(key->dsskey->q));
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
54 assert(mp_prime_is_prime(key->dsskey->q, trials, &qprime) == MP_OKAY);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
55 boguskey = !(pprime && qprime);
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1559
diff changeset
56 /* Could also check g**q mod p == 1 */
1529
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
57 }
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
58
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
59 if (!boguskey) {
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
60 printf("Random key/signature managed to verify!\n");
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
61 abort();
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
62 }
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
63
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
64
66a1a2547133 The fuzzer has managed to generated DSS key/signature pairs that
Matt Johnston <matt@ucc.asn.au>
parents: 1456
diff changeset
65 }
1380
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 }
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67 sign_key_free(key);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 m_malloc_free_epoch(1, 0);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69 } else {
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 m_malloc_free_epoch(1, 1);
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 TRACE(("dropbear_exit longjmped"))
1559
92c93b4a3646 Fix to be able to compile normal(ish) binaries with --enable-fuzz
Matt Johnston <matt@ucc.asn.au>
parents: 1529
diff changeset
72 /* dropbear_exit jumped here */
1380
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 }
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75 return 0;
d201105df2ed add fuzzer-verify
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 }