1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <assert.h>
#include <stdint.h>
#include <memory>
#include "blapi.h"
#include "prinit.h"
#include "ssl.h"
#include "shared.h"
#include "tls_client_config.h"
#include "tls_common.h"
#include "tls_mutators.h"
#include "tls_socket.h"
#ifdef IS_DTLS
__attribute__((constructor)) static void set_is_dtls() {
TlsMutators::SetIsDTLS();
}
#endif
PRFileDesc* ImportFD(PRFileDesc* model, PRFileDesc* fd) {
#ifdef IS_DTLS
return DTLS_ImportFD(model, fd);
#else
return SSL_ImportFD(model, fd);
#endif
}
static SECStatus AuthCertificateHook(void* arg, PRFileDesc* fd, PRBool checksig,
PRBool isServer) {
assert(!isServer);
auto config = reinterpret_cast<ClientConfig*>(arg);
return config->FailCertificateAuthentication() ? SECFailure : SECSuccess;
}
static void SetSocketOptions(PRFileDesc* fd,
std::unique_ptr<ClientConfig>& config) {
SECStatus rv = SSL_OptionSet(fd, SSL_NO_CACHE, config->EnableCache());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_ENABLE_EXTENDED_MASTER_SECRET,
config->EnableExtendedMasterSecret());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_REQUIRE_DH_NAMED_GROUPS,
config->RequireDhNamedGroups());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_ENABLE_FALSE_START, config->EnableFalseStart());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_ENABLE_DEFLATE, config->EnableDeflate());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_CBC_RANDOM_IV, config->EnableCbcRandomIv());
assert(rv == SECSuccess);
rv = SSL_OptionSet(fd, SSL_REQUIRE_SAFE_NEGOTIATION,
config->RequireSafeNegotiation());
assert(rv == SECSuccess);
#ifndef IS_DTLS
rv =
SSL_OptionSet(fd, SSL_ENABLE_RENEGOTIATION, SSL_RENEGOTIATE_UNRESTRICTED);
assert(rv == SECSuccess);
#endif
}
// This is only called when we set SSL_ENABLE_FALSE_START=1,
// so we can always just set *canFalseStart=true.
static SECStatus CanFalseStartCallback(PRFileDesc* fd, void* arg,
PRBool* canFalseStart) {
*canFalseStart = true;
return SECSuccess;
}
static void SetupCallbacks(PRFileDesc* fd, ClientConfig* config) {
SECStatus rv = SSL_AuthCertificateHook(fd, AuthCertificateHook, config);
assert(rv == SECSuccess);
rv = SSL_SetCanFalseStartCallback(fd, CanFalseStartCallback, nullptr);
assert(rv == SECSuccess);
}
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t len) {
static std::unique_ptr<NSSDatabase> db(new NSSDatabase());
assert(db != nullptr);
EnableAllProtocolVersions();
std::unique_ptr<ClientConfig> config(new ClientConfig(data, len));
// Clear the cache. We never want to resume as we couldn't reproduce that.
SSL_ClearSessionCache();
// Reset the RNG state.
assert(RNG_RandomUpdate(NULL, 0) == SECSuccess);
// Create and import dummy socket.
std::unique_ptr<DummyPrSocket> socket(new DummyPrSocket(data, len));
static PRDescIdentity id = PR_GetUniqueIdentity("fuzz-client");
ScopedPRFileDesc fd(DummyIOLayerMethods::CreateFD(id, socket.get()));
PRFileDesc* ssl_fd = ImportFD(nullptr, fd.get());
assert(ssl_fd == fd.get());
// Probably not too important for clients.
SSL_SetURL(ssl_fd, "server");
SetSocketOptions(ssl_fd, config);
EnableAllCipherSuites(ssl_fd);
SetupCallbacks(ssl_fd, config.get());
DoHandshake(ssl_fd, false);
return 0;
}
extern "C" size_t LLVMFuzzerCustomMutator(uint8_t* data, size_t size,
size_t max_size, unsigned int seed) {
using namespace TlsMutators;
return CustomMutate({DropRecord, ShuffleRecords, DuplicateRecord,
TruncateRecord, FragmentRecord},
data, size, max_size, seed);
}
extern "C" size_t LLVMFuzzerCustomCrossOver(const uint8_t* data1, size_t size1,
const uint8_t* data2, size_t size2,
uint8_t* out, size_t max_out_size,
unsigned int seed) {
return TlsMutators::CrossOver(data1, size1, data2, size2, out, max_out_size,
seed);
}
|
