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
7 *
8 * Licensed under the Apache License, Version 2.0 (the "License"); you may
9 * not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
11 *
12 * http://www.apache.org/licenses/LICENSE-2.0
13 *
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
16 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
19 */
20
21 #if !defined(MBEDTLS_CONFIG_FILE)
22 #include "mbedtls/config.h"
23 #else
24 #include MBEDTLS_CONFIG_FILE
25 #endif
26
27 #if defined(MBEDTLS_PLATFORM_C)
28 #include "mbedtls/platform.h"
29 #else
30 #include <stdio.h>
31 #include <stdlib.h>
32 #define mbedtls_fprintf fprintf
33 #define mbedtls_printf printf
34 #define mbedtls_snprintf snprintf
35 #define mbedtls_exit exit
36 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
37 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38 #endif
39
40 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) || \
41 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
42 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
43 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
44 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
45 !defined(MBEDTLS_THREADING_C) || !defined(MBEDTLS_THREADING_PTHREAD) || \
46 !defined(MBEDTLS_PEM_PARSE_C)
main(void)47 int main( void )
48 {
49 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
50 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
51 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
52 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
53 "MBEDTLS_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
54 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
55 mbedtls_exit( 0 );
56 }
57 #else
58
59 #include <stdlib.h>
60 #include <string.h>
61
62 #if defined(_WIN32)
63 #include <windows.h>
64 #endif
65
66 #include "mbedtls/entropy.h"
67 #include "mbedtls/ctr_drbg.h"
68 #include "mbedtls/certs.h"
69 #include "mbedtls/x509.h"
70 #include "mbedtls/ssl.h"
71 #include "mbedtls/net_sockets.h"
72 #include "mbedtls/error.h"
73
74 #if defined(MBEDTLS_SSL_CACHE_C)
75 #include "mbedtls/ssl_cache.h"
76 #endif
77
78 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
79 #include "mbedtls/memory_buffer_alloc.h"
80 #endif
81
82
83 #define HTTP_RESPONSE \
84 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
85 "<h2>mbed TLS Test Server</h2>\r\n" \
86 "<p>Successful connection using: %s</p>\r\n"
87
88 #define DEBUG_LEVEL 0
89
90 #define MAX_NUM_THREADS 5
91
92 mbedtls_threading_mutex_t debug_mutex;
93
my_mutexed_debug(void * ctx,int level,const char * file,int line,const char * str)94 static void my_mutexed_debug( void *ctx, int level,
95 const char *file, int line,
96 const char *str )
97 {
98 long int thread_id = (long int) pthread_self();
99
100 mbedtls_mutex_lock( &debug_mutex );
101
102 ((void) level);
103 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: [ #%ld ] %s",
104 file, line, thread_id, str );
105 fflush( (FILE *) ctx );
106
107 mbedtls_mutex_unlock( &debug_mutex );
108 }
109
110 typedef struct {
111 mbedtls_net_context client_fd;
112 int thread_complete;
113 const mbedtls_ssl_config *config;
114 } thread_info_t;
115
116 typedef struct {
117 int active;
118 thread_info_t data;
119 pthread_t thread;
120 } pthread_info_t;
121
122 static thread_info_t base_info;
123 static pthread_info_t threads[MAX_NUM_THREADS];
124
handle_ssl_connection(void * data)125 static void *handle_ssl_connection( void *data )
126 {
127 int ret, len;
128 thread_info_t *thread_info = (thread_info_t *) data;
129 mbedtls_net_context *client_fd = &thread_info->client_fd;
130 long int thread_id = (long int) pthread_self();
131 unsigned char buf[1024];
132 mbedtls_ssl_context ssl;
133
134 /* Make sure memory references are valid */
135 mbedtls_ssl_init( &ssl );
136
137 mbedtls_printf( " [ #%ld ] Setting up SSL/TLS data\n", thread_id );
138
139 /*
140 * 4. Get the SSL context ready
141 */
142 if( ( ret = mbedtls_ssl_setup( &ssl, thread_info->config ) ) != 0 )
143 {
144 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_setup returned -0x%04x\n",
145 thread_id, ( unsigned int ) -ret );
146 goto thread_exit;
147 }
148
149 mbedtls_ssl_set_bio( &ssl, client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
150
151 /*
152 * 5. Handshake
153 */
154 mbedtls_printf( " [ #%ld ] Performing the SSL/TLS handshake\n", thread_id );
155
156 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
157 {
158 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
159 {
160 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_handshake returned -0x%04x\n",
161 thread_id, ( unsigned int ) -ret );
162 goto thread_exit;
163 }
164 }
165
166 mbedtls_printf( " [ #%ld ] ok\n", thread_id );
167
168 /*
169 * 6. Read the HTTP Request
170 */
171 mbedtls_printf( " [ #%ld ] < Read from client\n", thread_id );
172
173 do
174 {
175 len = sizeof( buf ) - 1;
176 memset( buf, 0, sizeof( buf ) );
177 ret = mbedtls_ssl_read( &ssl, buf, len );
178
179 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
180 continue;
181
182 if( ret <= 0 )
183 {
184 switch( ret )
185 {
186 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
187 mbedtls_printf( " [ #%ld ] connection was closed gracefully\n",
188 thread_id );
189 goto thread_exit;
190
191 case MBEDTLS_ERR_NET_CONN_RESET:
192 mbedtls_printf( " [ #%ld ] connection was reset by peer\n",
193 thread_id );
194 goto thread_exit;
195
196 default:
197 mbedtls_printf( " [ #%ld ] mbedtls_ssl_read returned -0x%04x\n",
198 thread_id, ( unsigned int ) -ret );
199 goto thread_exit;
200 }
201 }
202
203 len = ret;
204 mbedtls_printf( " [ #%ld ] %d bytes read\n=====\n%s\n=====\n",
205 thread_id, len, (char *) buf );
206
207 if( ret > 0 )
208 break;
209 }
210 while( 1 );
211
212 /*
213 * 7. Write the 200 Response
214 */
215 mbedtls_printf( " [ #%ld ] > Write to client:\n", thread_id );
216
217 len = sprintf( (char *) buf, HTTP_RESPONSE,
218 mbedtls_ssl_get_ciphersuite( &ssl ) );
219
220 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
221 {
222 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
223 {
224 mbedtls_printf( " [ #%ld ] failed: peer closed the connection\n",
225 thread_id );
226 goto thread_exit;
227 }
228
229 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
230 {
231 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_write returned -0x%04x\n",
232 thread_id, ( unsigned int ) ret );
233 goto thread_exit;
234 }
235 }
236
237 len = ret;
238 mbedtls_printf( " [ #%ld ] %d bytes written\n=====\n%s\n=====\n",
239 thread_id, len, (char *) buf );
240
241 mbedtls_printf( " [ #%ld ] . Closing the connection...", thread_id );
242
243 while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
244 {
245 if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
246 ret != MBEDTLS_ERR_SSL_WANT_WRITE )
247 {
248 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_close_notify returned -0x%04x\n",
249 thread_id, ( unsigned int ) ret );
250 goto thread_exit;
251 }
252 }
253
254 mbedtls_printf( " ok\n" );
255
256 ret = 0;
257
258 thread_exit:
259
260 #ifdef MBEDTLS_ERROR_C
261 if( ret != 0 )
262 {
263 char error_buf[100];
264 mbedtls_strerror( ret, error_buf, 100 );
265 mbedtls_printf(" [ #%ld ] Last error was: -0x%04x - %s\n\n",
266 thread_id, ( unsigned int ) -ret, error_buf );
267 }
268 #endif
269
270 mbedtls_net_free( client_fd );
271 mbedtls_ssl_free( &ssl );
272
273 thread_info->thread_complete = 1;
274
275 return( NULL );
276 }
277
thread_create(mbedtls_net_context * client_fd)278 static int thread_create( mbedtls_net_context *client_fd )
279 {
280 int ret, i;
281
282 /*
283 * Find in-active or finished thread slot
284 */
285 for( i = 0; i < MAX_NUM_THREADS; i++ )
286 {
287 if( threads[i].active == 0 )
288 break;
289
290 if( threads[i].data.thread_complete == 1 )
291 {
292 mbedtls_printf( " [ main ] Cleaning up thread %d\n", i );
293 pthread_join(threads[i].thread, NULL );
294 memset( &threads[i], 0, sizeof(pthread_info_t) );
295 break;
296 }
297 }
298
299 if( i == MAX_NUM_THREADS )
300 return( -1 );
301
302 /*
303 * Fill thread-info for thread
304 */
305 memcpy( &threads[i].data, &base_info, sizeof(base_info) );
306 threads[i].active = 1;
307 memcpy( &threads[i].data.client_fd, client_fd, sizeof( mbedtls_net_context ) );
308
309 if( ( ret = pthread_create( &threads[i].thread, NULL, handle_ssl_connection,
310 &threads[i].data ) ) != 0 )
311 {
312 return( ret );
313 }
314
315 return( 0 );
316 }
317
main(void)318 int main( void )
319 {
320 int ret;
321 mbedtls_net_context listen_fd, client_fd;
322 const char pers[] = "ssl_pthread_server";
323
324 mbedtls_entropy_context entropy;
325 mbedtls_ctr_drbg_context ctr_drbg;
326 mbedtls_ssl_config conf;
327 mbedtls_x509_crt srvcert;
328 mbedtls_x509_crt cachain;
329 mbedtls_pk_context pkey;
330 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
331 unsigned char alloc_buf[100000];
332 #endif
333 #if defined(MBEDTLS_SSL_CACHE_C)
334 mbedtls_ssl_cache_context cache;
335 #endif
336
337 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
338 mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
339 #endif
340
341 #if defined(MBEDTLS_SSL_CACHE_C)
342 mbedtls_ssl_cache_init( &cache );
343 #endif
344
345 mbedtls_x509_crt_init( &srvcert );
346 mbedtls_x509_crt_init( &cachain );
347
348 mbedtls_ssl_config_init( &conf );
349 mbedtls_ctr_drbg_init( &ctr_drbg );
350 memset( threads, 0, sizeof(threads) );
351 mbedtls_net_init( &listen_fd );
352 mbedtls_net_init( &client_fd );
353
354 mbedtls_mutex_init( &debug_mutex );
355
356 base_info.config = &conf;
357
358 /*
359 * We use only a single entropy source that is used in all the threads.
360 */
361 mbedtls_entropy_init( &entropy );
362
363 /*
364 * 1. Load the certificates and private RSA key
365 */
366 mbedtls_printf( "\n . Loading the server cert. and key..." );
367 fflush( stdout );
368
369 /*
370 * This demonstration program uses embedded test certificates.
371 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
372 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
373 */
374 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
375 mbedtls_test_srv_crt_len );
376 if( ret != 0 )
377 {
378 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
379 goto exit;
380 }
381
382 ret = mbedtls_x509_crt_parse( &cachain, (const unsigned char *) mbedtls_test_cas_pem,
383 mbedtls_test_cas_pem_len );
384 if( ret != 0 )
385 {
386 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
387 goto exit;
388 }
389
390 mbedtls_pk_init( &pkey );
391 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
392 mbedtls_test_srv_key_len, NULL, 0 );
393 if( ret != 0 )
394 {
395 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
396 goto exit;
397 }
398
399 mbedtls_printf( " ok\n" );
400
401 /*
402 * 1b. Seed the random number generator
403 */
404 mbedtls_printf( " . Seeding the random number generator..." );
405
406 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
407 (const unsigned char *) pers,
408 strlen( pers ) ) ) != 0 )
409 {
410 mbedtls_printf( " failed: mbedtls_ctr_drbg_seed returned -0x%04x\n",
411 ( unsigned int ) -ret );
412 goto exit;
413 }
414
415 mbedtls_printf( " ok\n" );
416
417 /*
418 * 1c. Prepare SSL configuration
419 */
420 mbedtls_printf( " . Setting up the SSL data...." );
421
422 if( ( ret = mbedtls_ssl_config_defaults( &conf,
423 MBEDTLS_SSL_IS_SERVER,
424 MBEDTLS_SSL_TRANSPORT_STREAM,
425 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
426 {
427 mbedtls_printf( " failed: mbedtls_ssl_config_defaults returned -0x%04x\n",
428 ( unsigned int ) -ret );
429 goto exit;
430 }
431
432 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
433 mbedtls_ssl_conf_dbg( &conf, my_mutexed_debug, stdout );
434
435 /* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
436 * MBEDTLS_THREADING_C is set.
437 */
438 #if defined(MBEDTLS_SSL_CACHE_C)
439 mbedtls_ssl_conf_session_cache( &conf, &cache,
440 mbedtls_ssl_cache_get,
441 mbedtls_ssl_cache_set );
442 #endif
443
444 mbedtls_ssl_conf_ca_chain( &conf, &cachain, NULL );
445 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
446 {
447 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
448 goto exit;
449 }
450
451 mbedtls_printf( " ok\n" );
452
453 /*
454 * 2. Setup the listening TCP socket
455 */
456 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
457 fflush( stdout );
458
459 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
460 {
461 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
462 goto exit;
463 }
464
465 mbedtls_printf( " ok\n" );
466
467 reset:
468 #ifdef MBEDTLS_ERROR_C
469 if( ret != 0 )
470 {
471 char error_buf[100];
472 mbedtls_strerror( ret, error_buf, 100 );
473 mbedtls_printf( " [ main ] Last error was: -0x%04x - %s\n", ( unsigned int ) -ret,
474 error_buf );
475 }
476 #endif
477
478 /*
479 * 3. Wait until a client connects
480 */
481 mbedtls_printf( " [ main ] Waiting for a remote connection\n" );
482
483 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
484 NULL, 0, NULL ) ) != 0 )
485 {
486 mbedtls_printf( " [ main ] failed: mbedtls_net_accept returned -0x%04x\n",
487 ( unsigned int ) ret );
488 goto exit;
489 }
490
491 mbedtls_printf( " [ main ] ok\n" );
492 mbedtls_printf( " [ main ] Creating a new thread\n" );
493
494 if( ( ret = thread_create( &client_fd ) ) != 0 )
495 {
496 mbedtls_printf( " [ main ] failed: thread_create returned %d\n", ret );
497 mbedtls_net_free( &client_fd );
498 goto reset;
499 }
500
501 ret = 0;
502 goto reset;
503
504 exit:
505 mbedtls_x509_crt_free( &srvcert );
506 mbedtls_pk_free( &pkey );
507 #if defined(MBEDTLS_SSL_CACHE_C)
508 mbedtls_ssl_cache_free( &cache );
509 #endif
510 mbedtls_ctr_drbg_free( &ctr_drbg );
511 mbedtls_entropy_free( &entropy );
512 mbedtls_ssl_config_free( &conf );
513
514 mbedtls_net_free( &listen_fd );
515
516 mbedtls_mutex_free( &debug_mutex );
517
518 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
519 mbedtls_memory_buffer_alloc_free();
520 #endif
521
522 #if defined(_WIN32)
523 mbedtls_printf( " Press Enter to exit this program.\n" );
524 fflush( stdout ); getchar();
525 #endif
526
527 mbedtls_exit( ret );
528 }
529
530 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
531 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
532 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_THREADING_C &&
533 MBEDTLS_THREADING_PTHREAD && MBEDTLS_PEM_PARSE_C */
534
