1 files changed, 126 insertions, 0 deletions
diff --git a/test/core/security/ssl_server_fuzzer.cc b/test/core/security/ssl_server_fuzzer.cc
new file mode 100644
index 0000000000..5c5153b505
--- /dev/null
+++ b/test/core/security/ssl_server_fuzzer.cc
@@ -0,0 +1,126 @@
+/*
+ *
+ * Copyright 2016 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <grpc/grpc.h>
+#include <grpc/grpc_security.h>
+#include <grpc/support/log.h>
+
+#include "src/core/lib/iomgr/load_file.h"
+#include "src/core/lib/security/credentials/credentials.h"
+#include "src/core/lib/security/transport/security_connector.h"
+#include "test/core/end2end/data/ssl_test_data.h"
+#include "test/core/util/memory_counters.h"
+#include "test/core/util/mock_endpoint.h"
+
+bool squelch = true;
+// ssl has an array of global gpr_mu's that are never released.
+// Turning this on will fail the leak check.
+bool leak_check = false;
+
+static void discard_write(grpc_slice slice) {}
+
+static void dont_log(gpr_log_func_args* args) {}
+
+struct handshake_state {
+  bool done_callback_called;
+};
+
+static void on_handshake_done(grpc_exec_ctx* exec_ctx, void* arg,
+                              grpc_error* error) {
+  grpc_handshaker_args* args = static_cast<grpc_handshaker_args*>(arg);
+  struct handshake_state* state =
+      static_cast<struct handshake_state*>(args->user_data);
+  GPR_ASSERT(state->done_callback_called == false);
+  state->done_callback_called = true;
+  // The fuzzer should not pass the handshake.
+  GPR_ASSERT(error != GRPC_ERROR_NONE);
+}
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
+  struct grpc_memory_counters counters;
+  if (squelch) gpr_set_log_function(dont_log);
+  if (leak_check) grpc_memory_counters_init();
+  grpc_init();
+  grpc_exec_ctx exec_ctx = GRPC_EXEC_CTX_INIT;
+
+  grpc_resource_quota* resource_quota =
+      grpc_resource_quota_create("ssl_server_fuzzer");
+  grpc_endpoint* mock_endpoint =
+      grpc_mock_endpoint_create(discard_write, resource_quota);
+  grpc_resource_quota_unref_internal(&exec_ctx, resource_quota);
+
+  grpc_mock_endpoint_put_read(
+      &exec_ctx, mock_endpoint,
+      grpc_slice_from_copied_buffer((const char*)data, size));
+
+  // Load key pair and establish server SSL credentials.
+  grpc_ssl_pem_key_cert_pair pem_key_cert_pair;
+  grpc_slice ca_slice, cert_slice, key_slice;
+  ca_slice = grpc_slice_from_static_string(test_root_cert);
+  cert_slice = grpc_slice_from_static_string(test_server1_cert);
+  key_slice = grpc_slice_from_static_string(test_server1_key);
+  const char* ca_cert = (const char*)GRPC_SLICE_START_PTR(ca_slice);
+  pem_key_cert_pair.private_key = (const char*)GRPC_SLICE_START_PTR(key_slice);
+  pem_key_cert_pair.cert_chain = (const char*)GRPC_SLICE_START_PTR(cert_slice);
+  grpc_server_credentials* creds = grpc_ssl_server_credentials_create(
+      ca_cert, &pem_key_cert_pair, 1, 0, NULL);
+
+  // Create security connector
+  grpc_server_security_connector* sc = NULL;
+  grpc_security_status status =
+      grpc_server_credentials_create_security_connector(&exec_ctx, creds, &sc);
+  GPR_ASSERT(status == GRPC_SECURITY_OK);
+  grpc_millis deadline = GPR_MS_PER_SEC + grpc_exec_ctx_now(&exec_ctx);
+
+  struct handshake_state state;
+  state.done_callback_called = false;
+  grpc_handshake_manager* handshake_mgr = grpc_handshake_manager_create();
+  grpc_server_security_connector_add_handshakers(&exec_ctx, sc, handshake_mgr);
+  grpc_handshake_manager_do_handshake(
+      &exec_ctx, handshake_mgr, mock_endpoint, NULL /* channel_args */,
+      deadline, NULL /* acceptor */, on_handshake_done, &state);
+  grpc_exec_ctx_flush(&exec_ctx);
+
+  // If the given string happens to be part of the correct client hello, the
+  // server will wait for more data. Explicitly fail the server by shutting down
+  // the endpoint.
+  if (!state.done_callback_called) {
+    grpc_endpoint_shutdown(
+        &exec_ctx, mock_endpoint,
+        GRPC_ERROR_CREATE_FROM_STATIC_STRING("Explicit close"));
+    grpc_exec_ctx_flush(&exec_ctx);
+  }
+
+  GPR_ASSERT(state.done_callback_called);
+
+  grpc_handshake_manager_destroy(&exec_ctx, handshake_mgr);
+  GRPC_SECURITY_CONNECTOR_UNREF(&exec_ctx, &sc->base, "test");
+  grpc_server_credentials_release(creds);
+  grpc_slice_unref(cert_slice);
+  grpc_slice_unref(key_slice);
+  grpc_slice_unref(ca_slice);
+  grpc_exec_ctx_flush(&exec_ctx);
+
+  grpc_shutdown();
+  if (leak_check) {
+    counters = grpc_memory_counters_snapshot();
+    grpc_memory_counters_destroy();
+    GPR_ASSERT(counters.total_size_relative == 0);
+  }
+  return 0;
+}