1 files changed, 134 insertions, 0 deletions
diff --git a/nss/fuzz/tls_client_target.cc b/nss/fuzz/tls_client_target.cc
new file mode 100644
index 0000000..e595509
--- /dev/null
+++ b/nss/fuzz/tls_client_target.cc
@@ -0,0 +1,134 @@
+/* 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);
+}