aboutsummaryrefslogtreecommitdiffhomepage
path: root/test/core/handshake/server_ssl.cc
blob: 69c4fdc11b68105198db92cacaebf7b42f0bad38 (plain)
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
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
/*
 *
 * 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 <arpa/inet.h>
#include <openssl/err.h>
#include <openssl/ssl.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/sync.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/tsi/test_creds/server1.pem"
#define SSL_KEY_PATH "src/core/tsi/test_creds/server1.key"
#define SSL_CA_PATH "src/core/tsi/test_creds/ca.pem"

// Handshake completed signal to server thread.
static gpr_event client_handshake_complete;

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 (connect(s, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
    perror("Unable to connect");
    return -1;
  }

  return s;
}

// Simple gRPC server. This listens until client_handshake_complete occurs.
static void server_thread(void* arg) {
  const int port = *(int*)arg;

  // 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;
  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*)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* ssl_creds = grpc_ssl_server_credentials_create(
      ca_cert, &pem_key_cert_pair, 1, 0, nullptr);

  // Start server listening on local port.
  char* addr;
  gpr_asprintf(&addr, "127.0.0.1:%d", port);
  grpc_server* server = grpc_server_create(nullptr, nullptr);
  GPR_ASSERT(grpc_server_add_secure_http2_port(server, addr, ssl_creds));
  free(addr);

  grpc_completion_queue* cq = grpc_completion_queue_create_for_next(nullptr);

  grpc_server_register_completion_queue(server, cq, nullptr);
  grpc_server_start(server);

  // Wait a bounded number of time until client_handshake_complete is set,
  // sleeping between polls.
  int retries = 10;
  while (!gpr_event_get(&client_handshake_complete) && retries-- > 0) {
    const gpr_timespec cq_deadline = grpc_timeout_seconds_to_deadline(1);
    grpc_event ev = grpc_completion_queue_next(cq, cq_deadline, nullptr);
    GPR_ASSERT(ev.type == GRPC_QUEUE_TIMEOUT);
  }

  gpr_log(GPR_INFO, "Shutting down server");
  grpc_server_shutdown_and_notify(server, cq, nullptr);
  grpc_completion_queue_shutdown(cq);

  const gpr_timespec cq_deadline = grpc_timeout_seconds_to_deadline(5);
  grpc_event ev = grpc_completion_queue_next(cq, cq_deadline, nullptr);
  GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);

  grpc_server_destroy(server);
  grpc_completion_queue_destroy(cq);
  grpc_server_credentials_release(ssl_creds);
  grpc_slice_unref(cert_slice);
  grpc_slice_unref(key_slice);
  grpc_slice_unref(ca_slice);
}

// This test launches a gRPC server on a separate thread and then establishes a
// TLS handshake via a minimal TLS client. The TLS client has configurable (via
// alpn_list) ALPN settings and can probe at the supported ALPN preferences
// using this (via alpn_expected).
static bool server_ssl_test(const char* alpn_list[], unsigned int alpn_list_len,
                            const char* alpn_expected) {
  bool success = true;

  grpc_init();
  int port = grpc_pick_unused_port_or_die();
  gpr_event_init(&client_handshake_complete);

  // Launch the gRPC server thread.
  gpr_thd_options thdopt = gpr_thd_options_default();
  gpr_thd_id thdid;
  gpr_thd_options_set_joinable(&thdopt);
  GPR_ASSERT(gpr_thd_new(&thdid, server_thread, &port, &thdopt));

  SSL_load_error_strings();
  OpenSSL_add_ssl_algorithms();

  const SSL_METHOD* method = TLSv1_2_client_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/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();
  }

  // Configure ALPN list the client will send to the server. This must match the
  // wire format, see documentation for SSL_CTX_set_alpn_protos.
  unsigned int alpn_protos_len = alpn_list_len;
  for (unsigned int i = 0; i < alpn_list_len; ++i) {
    alpn_protos_len += (unsigned int)strlen(alpn_list[i]);
  }
  unsigned char* alpn_protos =
      static_cast<unsigned char*>(gpr_malloc(alpn_protos_len));
  unsigned char* p = alpn_protos;
  for (unsigned int i = 0; i < alpn_list_len; ++i) {
    const uint8_t len = (uint8_t)strlen(alpn_list[i]);
    *p++ = len;
    memcpy(p, alpn_list[i], len);
    p += len;
  }
  GPR_ASSERT(SSL_CTX_set_alpn_protos(ctx, alpn_protos, alpn_protos_len) == 0);

  // Try and connect to server. We allow a bounded number of retries as we might
  // be racing with the server setup on its separate thread.
  int retries = 10;
  int sock = -1;
  while (sock == -1 && retries-- > 0) {
    sock = create_socket(port);
    if (sock < 0) {
      sleep(1);
    }
  }
  GPR_ASSERT(sock > 0);
  gpr_log(GPR_INFO, "Connected to server on port %d", port);

  // Establish a SSL* and connect at SSL layer.
  SSL* ssl = SSL_new(ctx);
  GPR_ASSERT(ssl);
  SSL_set_fd(ssl, sock);
  if (SSL_connect(ssl) <= 0) {
    ERR_print_errors_fp(stderr);
    gpr_log(GPR_ERROR, "Handshake failed.");
    success = false;
  } else {
    gpr_log(GPR_INFO, "Handshake successful.");
    // Validate ALPN preferred by server matches alpn_expected.
    const unsigned char* alpn_selected;
    unsigned int alpn_selected_len;
    SSL_get0_alpn_selected(ssl, &alpn_selected, &alpn_selected_len);
    if (strlen(alpn_expected) != alpn_selected_len ||
        strncmp((const char*)alpn_selected, alpn_expected, alpn_selected_len) !=
            0) {
      gpr_log(GPR_ERROR, "Unexpected ALPN protocol preference");
      success = false;
    }
  }
  gpr_event_set(&client_handshake_complete, &client_handshake_complete);

  SSL_free(ssl);
  gpr_free(alpn_protos);
  SSL_CTX_free(ctx);
  EVP_cleanup();
  close(sock);

  gpr_thd_join(thdid);

  grpc_shutdown();

  return success;
}

int main(int argc, char* argv[]) {
  // Handshake succeeeds when the client supplies the standard ALPN list.
  const char* full_alpn_list[] = {"grpc-exp", "h2"};
  GPR_ASSERT(server_ssl_test(full_alpn_list, 2, "grpc-exp"));
  // Handshake succeeeds when the client supplies only h2 as the ALPN list. This
  // covers legacy gRPC clients which don't support grpc-exp.
  const char* h2_only_alpn_list[] = {"h2"};
  GPR_ASSERT(server_ssl_test(h2_only_alpn_list, 1, "h2"));
  // Handshake succeeds when the client supplies superfluous ALPN entries and
  // also when h2 precedes gprc-exp.
  const char* extra_alpn_list[] = {"foo", "h2", "bar", "grpc-exp"};
  GPR_ASSERT(server_ssl_test(extra_alpn_list, 4, "h2"));
  // Handshake fails when the client uses a fake protocol as its only ALPN
  // preference. This validates the server is correctly validating ALPN
  // and sanity checks the server_ssl_test.
  const char* fake_alpn_list[] = {"foo"};
  GPR_ASSERT(!server_ssl_test(fake_alpn_list, 1, "foo"));
  return 0;
}