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/* 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) {
std::unique_ptr<NSSDatabase> db(new NSSDatabase());
assert(db != nullptr);
EnableAllProtocolVersions();
std::unique_ptr<ClientConfig> config(new ClientConfig(data, len));
// 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);
// Release all SIDs.
SSL_ClearSessionCache();
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);
}
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