| /* |
| * |
| * Copyright 2016, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #include <arpa/inet.h> |
| #include <openssl/err.h> |
| #include <openssl/ssl.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <unistd.h> |
| |
| #include <grpc/grpc.h> |
| #include <grpc/grpc_security.h> |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/thd.h> |
| #include "src/core/lib/iomgr/load_file.h" |
| #include "test/core/util/port.h" |
| #include "test/core/util/test_config.h" |
| |
| #define SSL_CERT_PATH "src/core/lib/tsi/test_creds/server1.pem" |
| #define SSL_KEY_PATH "src/core/lib/tsi/test_creds/server1.key" |
| #define SSL_CA_PATH "src/core/lib/tsi/test_creds/ca.pem" |
| |
| // Arguments for TLS server thread. |
| typedef struct { |
| int socket; |
| char *alpn_preferred; |
| } server_args; |
| |
| // From https://wiki.openssl.org/index.php/Simple_TLS_Server. |
| static int create_socket(int port) { |
| int s; |
| struct sockaddr_in addr; |
| |
| addr.sin_family = AF_INET; |
| addr.sin_port = htons((uint16_t)port); |
| addr.sin_addr.s_addr = htonl(INADDR_ANY); |
| |
| s = socket(AF_INET, SOCK_STREAM, 0); |
| if (s < 0) { |
| perror("Unable to create socket"); |
| return -1; |
| } |
| |
| if (bind(s, (struct sockaddr *)&addr, sizeof(addr)) < 0) { |
| perror("Unable to bind"); |
| gpr_log(GPR_ERROR, "Unable to bind to %d", port); |
| close(s); |
| return -1; |
| } |
| |
| if (listen(s, 1) < 0) { |
| perror("Unable to listen"); |
| close(s); |
| return -1; |
| } |
| |
| return s; |
| } |
| |
| // Server callback during ALPN negotiation. See man page for |
| // SSL_CTX_set_alpn_select_cb. |
| static int alpn_select_cb(SSL *ssl, const uint8_t **out, uint8_t *out_len, |
| const uint8_t *in, unsigned in_len, void *arg) { |
| const uint8_t *alpn_preferred = (const uint8_t *)arg; |
| |
| *out = alpn_preferred; |
| *out_len = (uint8_t)strlen((char *)alpn_preferred); |
| |
| // Validate that the ALPN list includes "h2" and "grpc-exp", that "grpc-exp" |
| // precedes "h2". |
| bool grpc_exp_seen = false; |
| bool h2_seen = false; |
| const char *inp = (const char *)in; |
| for (int i = 0; i < (int)in_len; ++i) { |
| const size_t length = (size_t)*inp++; |
| if (length == strlen("grpc-exp") && strncmp(inp, "grpc-exp", length) == 0) { |
| grpc_exp_seen = true; |
| GPR_ASSERT(!h2_seen); |
| } |
| if (length == strlen("h2") && strncmp(inp, "h2", length) == 0) { |
| h2_seen = true; |
| GPR_ASSERT(grpc_exp_seen); |
| } |
| inp += length; |
| } |
| |
| GPR_ASSERT(grpc_exp_seen); |
| GPR_ASSERT(h2_seen); |
| |
| return SSL_TLSEXT_ERR_OK; |
| } |
| |
| // Minimal TLS server. This is largely based on the example at |
| // https://wiki.openssl.org/index.php/Simple_TLS_Server and the gRPC core |
| // internals in src/core/lib/tsi/ssl_transport_security.c. |
| static void server_thread(void *arg) { |
| const server_args *args = (server_args *)arg; |
| |
| SSL_load_error_strings(); |
| OpenSSL_add_ssl_algorithms(); |
| |
| const SSL_METHOD *method = TLSv1_2_server_method(); |
| SSL_CTX *ctx = SSL_CTX_new(method); |
| if (!ctx) { |
| perror("Unable to create SSL context"); |
| ERR_print_errors_fp(stderr); |
| abort(); |
| } |
| |
| // Load key pair. |
| if (SSL_CTX_use_certificate_file(ctx, SSL_CERT_PATH, SSL_FILETYPE_PEM) < 0) { |
| ERR_print_errors_fp(stderr); |
| abort(); |
| } |
| if (SSL_CTX_use_PrivateKey_file(ctx, SSL_KEY_PATH, SSL_FILETYPE_PEM) < 0) { |
| ERR_print_errors_fp(stderr); |
| abort(); |
| } |
| |
| // Set the cipher list to match the one expressed in |
| // src/core/lib/tsi/ssl_transport_security.c. |
| const char *cipher_list = |
| "ECDHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-" |
| "SHA384:ECDHE-RSA-AES256-GCM-SHA384"; |
| if (!SSL_CTX_set_cipher_list(ctx, cipher_list)) { |
| ERR_print_errors_fp(stderr); |
| gpr_log(GPR_ERROR, "Couldn't set server cipher list."); |
| abort(); |
| } |
| |
| // Register the ALPN selection callback. |
| SSL_CTX_set_alpn_select_cb(ctx, alpn_select_cb, args->alpn_preferred); |
| |
| // bind/listen/accept at TCP layer. |
| const int sock = args->socket; |
| gpr_log(GPR_INFO, "Server listening"); |
| struct sockaddr_in addr; |
| socklen_t len = sizeof(addr); |
| const int client = accept(sock, (struct sockaddr *)&addr, &len); |
| if (client < 0) { |
| perror("Unable to accept"); |
| abort(); |
| } |
| |
| // Establish a SSL* and accept at SSL layer. |
| SSL *ssl = SSL_new(ctx); |
| GPR_ASSERT(ssl); |
| SSL_set_fd(ssl, client); |
| if (SSL_accept(ssl) <= 0) { |
| ERR_print_errors_fp(stderr); |
| gpr_log(GPR_ERROR, "Handshake failed."); |
| } else { |
| gpr_log(GPR_INFO, "Handshake successful."); |
| } |
| |
| // Wait until the client drops its connection. |
| char buf; |
| while (SSL_read(ssl, &buf, sizeof(buf)) > 0) |
| ; |
| |
| SSL_free(ssl); |
| close(client); |
| close(sock); |
| SSL_CTX_free(ctx); |
| EVP_cleanup(); |
| } |
| |
| // This test launches a minimal TLS server on a separate thread and then |
| // establishes a TLS handshake via the core library to the server. The TLS |
| // server validates ALPN aspects of the handshake and supplies the protocol |
| // specified in the server_alpn_preferred argument to the client. |
| static bool client_ssl_test(char *server_alpn_preferred) { |
| bool success = true; |
| |
| grpc_init(); |
| |
| // Find a port we can bind to. Retries added to handle flakes in port server |
| // and port picking. |
| int port = -1; |
| int server_socket = -1; |
| int socket_retries = 10; |
| while (server_socket == -1 && socket_retries-- > 0) { |
| port = grpc_pick_unused_port_or_die(); |
| server_socket = create_socket(port); |
| if (server_socket == -1) { |
| sleep(1); |
| } |
| } |
| GPR_ASSERT(server_socket > 0); |
| |
| // Launch the TLS server thread. |
| gpr_thd_options thdopt = gpr_thd_options_default(); |
| gpr_thd_id thdid; |
| gpr_thd_options_set_joinable(&thdopt); |
| server_args args = {.socket = server_socket, |
| .alpn_preferred = server_alpn_preferred}; |
| GPR_ASSERT(gpr_thd_new(&thdid, server_thread, &args, &thdopt)); |
| |
| // Load key pair and establish client SSL credentials. |
| grpc_ssl_pem_key_cert_pair pem_key_cert_pair; |
| gpr_slice ca_slice, cert_slice, key_slice; |
| GPR_ASSERT(GRPC_LOG_IF_ERROR("load_file", |
| grpc_load_file(SSL_CA_PATH, 1, &ca_slice))); |
| GPR_ASSERT(GRPC_LOG_IF_ERROR("load_file", |
| grpc_load_file(SSL_CERT_PATH, 1, &cert_slice))); |
| GPR_ASSERT(GRPC_LOG_IF_ERROR("load_file", |
| grpc_load_file(SSL_KEY_PATH, 1, &key_slice))); |
| const char *ca_cert = (const char *)GPR_SLICE_START_PTR(ca_slice); |
| pem_key_cert_pair.private_key = (const char *)GPR_SLICE_START_PTR(key_slice); |
| pem_key_cert_pair.cert_chain = (const char *)GPR_SLICE_START_PTR(cert_slice); |
| grpc_channel_credentials *ssl_creds = |
| grpc_ssl_credentials_create(ca_cert, &pem_key_cert_pair, NULL); |
| |
| // Establish a channel pointing at the TLS server. Since the gRPC runtime is |
| // lazy, this won't necessarily establish a connection yet. |
| char *target; |
| gpr_asprintf(&target, "127.0.0.1:%d", port); |
| grpc_arg ssl_name_override = {GRPC_ARG_STRING, |
| GRPC_SSL_TARGET_NAME_OVERRIDE_ARG, |
| {"foo.test.google.fr"}}; |
| grpc_channel_args grpc_args; |
| grpc_args.num_args = 1; |
| grpc_args.args = &ssl_name_override; |
| grpc_channel *channel = |
| grpc_secure_channel_create(ssl_creds, target, &grpc_args, NULL); |
| GPR_ASSERT(channel); |
| gpr_free(target); |
| |
| // Initially the channel will be idle, the |
| // grpc_channel_check_connectivity_state triggers an attempt to connect. |
| GPR_ASSERT(grpc_channel_check_connectivity_state( |
| channel, 1 /* try_to_connect */) == GRPC_CHANNEL_IDLE); |
| |
| // Wait a bounded number of times for the channel to be ready. When the |
| // channel is ready, the initial TLS handshake will have successfully |
| // completed and we know that the client's ALPN list satisfied the server. |
| int retries = 10; |
| grpc_connectivity_state state = GRPC_CHANNEL_IDLE; |
| grpc_completion_queue *cq = grpc_completion_queue_create(NULL); |
| while (state != GRPC_CHANNEL_READY && retries-- > 0) { |
| grpc_channel_watch_connectivity_state( |
| channel, state, GRPC_TIMEOUT_SECONDS_TO_DEADLINE(3), cq, NULL); |
| gpr_timespec cq_deadline = GRPC_TIMEOUT_SECONDS_TO_DEADLINE(5); |
| grpc_event ev = grpc_completion_queue_next(cq, cq_deadline, NULL); |
| GPR_ASSERT(ev.type == GRPC_OP_COMPLETE); |
| state = |
| grpc_channel_check_connectivity_state(channel, 0 /* try_to_connect */); |
| } |
| grpc_completion_queue_destroy(cq); |
| if (retries < 0) { |
| success = false; |
| } |
| |
| grpc_channel_destroy(channel); |
| grpc_channel_credentials_release(ssl_creds); |
| gpr_slice_unref(cert_slice); |
| gpr_slice_unref(key_slice); |
| gpr_slice_unref(ca_slice); |
| |
| gpr_thd_join(thdid); |
| |
| grpc_shutdown(); |
| |
| return success; |
| } |
| |
| int main(int argc, char *argv[]) { |
| // Handshake succeeeds when the server has grpc-exp as the ALPN preference. |
| GPR_ASSERT(client_ssl_test("grpc-exp")); |
| // Handshake succeeeds when the server has h2 as the ALPN preference. This |
| // covers legacy gRPC servers which don't support grpc-exp. |
| GPR_ASSERT(client_ssl_test("h2")); |
| // Handshake fails when the server uses a fake protocol as its ALPN |
| // preference. This validates the client is correctly validating ALPN returns |
| // and sanity checks the client_ssl_test. |
| GPR_ASSERT(!client_ssl_test("foo")); |
| return 0; |
| } |