1 /*
2 * SSL server demonstration program using pthread for handling multiple
3 * clients.
4 *
5 * Copyright The Mbed TLS Contributors
6 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
7 */
8
9 #include "mbedtls/build_info.h"
10
11 #include "mbedtls/platform.h"
12
13 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
14 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_SRV_C) || \
15 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
16 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
17 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_THREADING_C) || \
18 !defined(MBEDTLS_THREADING_PTHREAD) || !defined(MBEDTLS_PEM_PARSE_C)
main(void)19 int main(void)
20 {
21 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C "
22 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
23 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
24 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
25 "MBEDTLS_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
26 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
27 mbedtls_exit(0);
28 }
29 #else
30
31 #include <stdlib.h>
32 #include <string.h>
33
34 #if defined(_WIN32)
35 #include <windows.h>
36 #endif
37
38 #include "mbedtls/entropy.h"
39 #include "mbedtls/ctr_drbg.h"
40 #include "mbedtls/x509.h"
41 #include "mbedtls/ssl.h"
42 #include "mbedtls/net_sockets.h"
43 #include "mbedtls/error.h"
44 #include "test/certs.h"
45
46 #if defined(MBEDTLS_SSL_CACHE_C)
47 #include "mbedtls/ssl_cache.h"
48 #endif
49
50 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
51 #include "mbedtls/memory_buffer_alloc.h"
52 #endif
53
54
55 #define HTTP_RESPONSE \
56 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
57 "<h2>Mbed TLS Test Server</h2>\r\n" \
58 "<p>Successful connection using: %s</p>\r\n"
59
60 #define DEBUG_LEVEL 0
61
62 #define MAX_NUM_THREADS 5
63
64 mbedtls_threading_mutex_t debug_mutex;
65
my_mutexed_debug(void * ctx,int level,const char * file,int line,const char * str)66 static void my_mutexed_debug(void *ctx, int level,
67 const char *file, int line,
68 const char *str)
69 {
70 long int thread_id = (long int) pthread_self();
71
72 mbedtls_mutex_lock(&debug_mutex);
73
74 ((void) level);
75 mbedtls_fprintf((FILE *) ctx, "%s:%04d: [ #%ld ] %s",
76 file, line, thread_id, str);
77 fflush((FILE *) ctx);
78
79 mbedtls_mutex_unlock(&debug_mutex);
80 }
81
82 typedef struct {
83 mbedtls_net_context client_fd;
84 int thread_complete;
85 const mbedtls_ssl_config *config;
86 } thread_info_t;
87
88 typedef struct {
89 int active;
90 thread_info_t data;
91 pthread_t thread;
92 } pthread_info_t;
93
94 static thread_info_t base_info;
95 static pthread_info_t threads[MAX_NUM_THREADS];
96
handle_ssl_connection(void * data)97 static void *handle_ssl_connection(void *data)
98 {
99 int ret, len;
100 thread_info_t *thread_info = (thread_info_t *) data;
101 mbedtls_net_context *client_fd = &thread_info->client_fd;
102 long int thread_id = (long int) pthread_self();
103 unsigned char buf[1024];
104 mbedtls_ssl_context ssl;
105
106 /* Make sure memory references are valid */
107 mbedtls_ssl_init(&ssl);
108
109 mbedtls_printf(" [ #%ld ] Setting up SSL/TLS data\n", thread_id);
110
111 /*
112 * 4. Get the SSL context ready
113 */
114 if ((ret = mbedtls_ssl_setup(&ssl, thread_info->config)) != 0) {
115 mbedtls_printf(" [ #%ld ] failed: mbedtls_ssl_setup returned -0x%04x\n",
116 thread_id, (unsigned int) -ret);
117 goto thread_exit;
118 }
119
120 mbedtls_ssl_set_bio(&ssl, client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
121
122 /*
123 * 5. Handshake
124 */
125 mbedtls_printf(" [ #%ld ] Performing the SSL/TLS handshake\n", thread_id);
126
127 while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
128 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
129 mbedtls_printf(" [ #%ld ] failed: mbedtls_ssl_handshake returned -0x%04x\n",
130 thread_id, (unsigned int) -ret);
131 goto thread_exit;
132 }
133 }
134
135 mbedtls_printf(" [ #%ld ] ok\n", thread_id);
136
137 /*
138 * 6. Read the HTTP Request
139 */
140 mbedtls_printf(" [ #%ld ] < Read from client\n", thread_id);
141
142 do {
143 len = sizeof(buf) - 1;
144 memset(buf, 0, sizeof(buf));
145 ret = mbedtls_ssl_read(&ssl, buf, len);
146
147 if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
148 continue;
149 }
150
151 if (ret <= 0) {
152 switch (ret) {
153 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
154 mbedtls_printf(" [ #%ld ] connection was closed gracefully\n",
155 thread_id);
156 goto thread_exit;
157
158 case MBEDTLS_ERR_NET_CONN_RESET:
159 mbedtls_printf(" [ #%ld ] connection was reset by peer\n",
160 thread_id);
161 goto thread_exit;
162
163 default:
164 mbedtls_printf(" [ #%ld ] mbedtls_ssl_read returned -0x%04x\n",
165 thread_id, (unsigned int) -ret);
166 goto thread_exit;
167 }
168 }
169
170 len = ret;
171 mbedtls_printf(" [ #%ld ] %d bytes read\n=====\n%s\n=====\n",
172 thread_id, len, (char *) buf);
173
174 if (ret > 0) {
175 break;
176 }
177 } while (1);
178
179 /*
180 * 7. Write the 200 Response
181 */
182 mbedtls_printf(" [ #%ld ] > Write to client:\n", thread_id);
183
184 len = sprintf((char *) buf, HTTP_RESPONSE,
185 mbedtls_ssl_get_ciphersuite(&ssl));
186
187 while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
188 if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
189 mbedtls_printf(" [ #%ld ] failed: peer closed the connection\n",
190 thread_id);
191 goto thread_exit;
192 }
193
194 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
195 mbedtls_printf(" [ #%ld ] failed: mbedtls_ssl_write returned -0x%04x\n",
196 thread_id, (unsigned int) ret);
197 goto thread_exit;
198 }
199 }
200
201 len = ret;
202 mbedtls_printf(" [ #%ld ] %d bytes written\n=====\n%s\n=====\n",
203 thread_id, len, (char *) buf);
204
205 mbedtls_printf(" [ #%ld ] . Closing the connection...", thread_id);
206
207 while ((ret = mbedtls_ssl_close_notify(&ssl)) < 0) {
208 if (ret != MBEDTLS_ERR_SSL_WANT_READ &&
209 ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
210 mbedtls_printf(" [ #%ld ] failed: mbedtls_ssl_close_notify returned -0x%04x\n",
211 thread_id, (unsigned int) ret);
212 goto thread_exit;
213 }
214 }
215
216 mbedtls_printf(" ok\n");
217
218 ret = 0;
219
220 thread_exit:
221
222 #ifdef MBEDTLS_ERROR_C
223 if (ret != 0) {
224 char error_buf[100];
225 mbedtls_strerror(ret, error_buf, 100);
226 mbedtls_printf(" [ #%ld ] Last error was: -0x%04x - %s\n\n",
227 thread_id, (unsigned int) -ret, error_buf);
228 }
229 #endif
230
231 mbedtls_net_free(client_fd);
232 mbedtls_ssl_free(&ssl);
233
234 thread_info->thread_complete = 1;
235
236 return NULL;
237 }
238
thread_create(mbedtls_net_context * client_fd)239 static int thread_create(mbedtls_net_context *client_fd)
240 {
241 int ret, i;
242
243 /*
244 * Find in-active or finished thread slot
245 */
246 for (i = 0; i < MAX_NUM_THREADS; i++) {
247 if (threads[i].active == 0) {
248 break;
249 }
250
251 if (threads[i].data.thread_complete == 1) {
252 mbedtls_printf(" [ main ] Cleaning up thread %d\n", i);
253 pthread_join(threads[i].thread, NULL);
254 memset(&threads[i], 0, sizeof(pthread_info_t));
255 break;
256 }
257 }
258
259 if (i == MAX_NUM_THREADS) {
260 return -1;
261 }
262
263 /*
264 * Fill thread-info for thread
265 */
266 memcpy(&threads[i].data, &base_info, sizeof(base_info));
267 threads[i].active = 1;
268 memcpy(&threads[i].data.client_fd, client_fd, sizeof(mbedtls_net_context));
269
270 if ((ret = pthread_create(&threads[i].thread, NULL, handle_ssl_connection,
271 &threads[i].data)) != 0) {
272 return ret;
273 }
274
275 return 0;
276 }
277
main(void)278 int main(void)
279 {
280 int ret;
281 mbedtls_net_context listen_fd, client_fd;
282 const char pers[] = "ssl_pthread_server";
283
284 mbedtls_entropy_context entropy;
285 mbedtls_ctr_drbg_context ctr_drbg;
286 mbedtls_ssl_config conf;
287 mbedtls_x509_crt srvcert;
288 mbedtls_x509_crt cachain;
289 mbedtls_pk_context pkey;
290 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
291 unsigned char alloc_buf[100000];
292 #endif
293 #if defined(MBEDTLS_SSL_CACHE_C)
294 mbedtls_ssl_cache_context cache;
295 #endif
296
297 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
298 mbedtls_memory_buffer_alloc_init(alloc_buf, sizeof(alloc_buf));
299 #endif
300
301 #if defined(MBEDTLS_SSL_CACHE_C)
302 mbedtls_ssl_cache_init(&cache);
303 #endif
304
305 mbedtls_x509_crt_init(&srvcert);
306 mbedtls_x509_crt_init(&cachain);
307
308 mbedtls_ssl_config_init(&conf);
309 mbedtls_ctr_drbg_init(&ctr_drbg);
310 memset(threads, 0, sizeof(threads));
311 mbedtls_net_init(&listen_fd);
312 mbedtls_net_init(&client_fd);
313
314 mbedtls_mutex_init(&debug_mutex);
315
316 base_info.config = &conf;
317
318 /*
319 * We use only a single entropy source that is used in all the threads.
320 */
321 mbedtls_entropy_init(&entropy);
322
323 #if defined(MBEDTLS_USE_PSA_CRYPTO)
324 psa_status_t status = psa_crypto_init();
325 if (status != PSA_SUCCESS) {
326 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
327 (int) status);
328 ret = MBEDTLS_ERR_SSL_HW_ACCEL_FAILED;
329 goto exit;
330 }
331 #endif /* MBEDTLS_USE_PSA_CRYPTO */
332
333 /*
334 * 1a. Seed the random number generator
335 */
336 mbedtls_printf(" . Seeding the random number generator...");
337
338 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
339 (const unsigned char *) pers,
340 strlen(pers))) != 0) {
341 mbedtls_printf(" failed: mbedtls_ctr_drbg_seed returned -0x%04x\n",
342 (unsigned int) -ret);
343 goto exit;
344 }
345
346 mbedtls_printf(" ok\n");
347
348 /*
349 * 1b. Load the certificates and private RSA key
350 */
351 mbedtls_printf("\n . Loading the server cert. and key...");
352 fflush(stdout);
353
354 /*
355 * This demonstration program uses embedded test certificates.
356 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
357 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
358 */
359 ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_srv_crt,
360 mbedtls_test_srv_crt_len);
361 if (ret != 0) {
362 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret);
363 goto exit;
364 }
365
366 ret = mbedtls_x509_crt_parse(&cachain, (const unsigned char *) mbedtls_test_cas_pem,
367 mbedtls_test_cas_pem_len);
368 if (ret != 0) {
369 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret);
370 goto exit;
371 }
372
373 mbedtls_pk_init(&pkey);
374 ret = mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
375 mbedtls_test_srv_key_len, NULL, 0,
376 mbedtls_ctr_drbg_random, &ctr_drbg);
377 if (ret != 0) {
378 mbedtls_printf(" failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret);
379 goto exit;
380 }
381
382 mbedtls_printf(" ok\n");
383
384 /*
385 * 1c. Prepare SSL configuration
386 */
387 mbedtls_printf(" . Setting up the SSL data....");
388
389 if ((ret = mbedtls_ssl_config_defaults(&conf,
390 MBEDTLS_SSL_IS_SERVER,
391 MBEDTLS_SSL_TRANSPORT_STREAM,
392 MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
393 mbedtls_printf(" failed: mbedtls_ssl_config_defaults returned -0x%04x\n",
394 (unsigned int) -ret);
395 goto exit;
396 }
397
398 mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
399 mbedtls_ssl_conf_dbg(&conf, my_mutexed_debug, stdout);
400
401 /* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
402 * MBEDTLS_THREADING_C is set.
403 */
404 #if defined(MBEDTLS_SSL_CACHE_C)
405 mbedtls_ssl_conf_session_cache(&conf, &cache,
406 mbedtls_ssl_cache_get,
407 mbedtls_ssl_cache_set);
408 #endif
409
410 mbedtls_ssl_conf_ca_chain(&conf, &cachain, NULL);
411 if ((ret = mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey)) != 0) {
412 mbedtls_printf(" failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret);
413 goto exit;
414 }
415
416 mbedtls_printf(" ok\n");
417
418 /*
419 * 2. Setup the listening TCP socket
420 */
421 mbedtls_printf(" . Bind on https://localhost:4433/ ...");
422 fflush(stdout);
423
424 if ((ret = mbedtls_net_bind(&listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP)) != 0) {
425 mbedtls_printf(" failed\n ! mbedtls_net_bind returned %d\n\n", ret);
426 goto exit;
427 }
428
429 mbedtls_printf(" ok\n");
430
431 reset:
432 #ifdef MBEDTLS_ERROR_C
433 if (ret != 0) {
434 char error_buf[100];
435 mbedtls_strerror(ret, error_buf, 100);
436 mbedtls_printf(" [ main ] Last error was: -0x%04x - %s\n", (unsigned int) -ret,
437 error_buf);
438 }
439 #endif
440
441 /*
442 * 3. Wait until a client connects
443 */
444 mbedtls_printf(" [ main ] Waiting for a remote connection\n");
445
446 if ((ret = mbedtls_net_accept(&listen_fd, &client_fd,
447 NULL, 0, NULL)) != 0) {
448 mbedtls_printf(" [ main ] failed: mbedtls_net_accept returned -0x%04x\n",
449 (unsigned int) ret);
450 goto exit;
451 }
452
453 mbedtls_printf(" [ main ] ok\n");
454 mbedtls_printf(" [ main ] Creating a new thread\n");
455
456 if ((ret = thread_create(&client_fd)) != 0) {
457 mbedtls_printf(" [ main ] failed: thread_create returned %d\n", ret);
458 mbedtls_net_free(&client_fd);
459 goto reset;
460 }
461
462 ret = 0;
463 goto reset;
464
465 exit:
466 mbedtls_x509_crt_free(&srvcert);
467 mbedtls_pk_free(&pkey);
468 #if defined(MBEDTLS_SSL_CACHE_C)
469 mbedtls_ssl_cache_free(&cache);
470 #endif
471 mbedtls_ctr_drbg_free(&ctr_drbg);
472 mbedtls_entropy_free(&entropy);
473 mbedtls_ssl_config_free(&conf);
474 mbedtls_net_free(&listen_fd);
475 mbedtls_mutex_free(&debug_mutex);
476 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
477 mbedtls_memory_buffer_alloc_free();
478 #endif
479 #if defined(MBEDTLS_USE_PSA_CRYPTO)
480 mbedtls_psa_crypto_free();
481 #endif /* MBEDTLS_USE_PSA_CRYPTO */
482
483 mbedtls_exit(ret);
484 }
485
486 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
487 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
488 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_THREADING_C &&
489 MBEDTLS_THREADING_PTHREAD && MBEDTLS_PEM_PARSE_C */
490
