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 * This file is provided under the Apache License 2.0, or the
9 * GNU General Public License v2.0 or later.
10 *
11 * **********
12 * Apache License 2.0:
13 *
14 * Licensed under the Apache License, Version 2.0 (the "License"); you may
15 * not use this file except in compliance with the License.
16 * You may obtain a copy of the License at
17 *
18 * http://www.apache.org/licenses/LICENSE-2.0
19 *
20 * Unless required by applicable law or agreed to in writing, software
21 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
22 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
23 * See the License for the specific language governing permissions and
24 * limitations under the License.
25 *
26 * **********
27 *
28 * **********
29 * GNU General Public License v2.0 or later:
30 *
31 * This program is free software; you can redistribute it and/or modify
32 * it under the terms of the GNU General Public License as published by
33 * the Free Software Foundation; either version 2 of the License, or
34 * (at your option) any later version.
35 *
36 * This program is distributed in the hope that it will be useful,
37 * but WITHOUT ANY WARRANTY; without even the implied warranty of
38 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
39 * GNU General Public License for more details.
40 *
41 * You should have received a copy of the GNU General Public License along
42 * with this program; if not, write to the Free Software Foundation, Inc.,
43 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
44 *
45 * **********
46 */
47
48 #if !defined(MBEDTLS_CONFIG_FILE)
49 #include "mbedtls/config.h"
50 #else
51 #include MBEDTLS_CONFIG_FILE
52 #endif
53
54 #if defined(MBEDTLS_PLATFORM_C)
55 #include "mbedtls/platform.h"
56 #else
57 #include <stdio.h>
58 #include <stdlib.h>
59 #define mbedtls_fprintf fprintf
60 #define mbedtls_printf printf
61 #define mbedtls_snprintf snprintf
62 #define mbedtls_exit exit
63 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
64 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
65 #endif
66
67 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) || \
68 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
69 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
70 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
71 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
72 !defined(MBEDTLS_THREADING_C) || !defined(MBEDTLS_THREADING_PTHREAD) || \
73 !defined(MBEDTLS_PEM_PARSE_C)
main(void)74 int main( void )
75 {
76 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
77 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
78 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
79 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
80 "MBEDTLS_THREADING_C and/or MBEDTLS_THREADING_PTHREAD "
81 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
82 mbedtls_exit( 0 );
83 }
84 #else
85
86 #include <stdlib.h>
87 #include <string.h>
88
89 #if defined(_WIN32)
90 #include <windows.h>
91 #endif
92
93 #include "mbedtls/entropy.h"
94 #include "mbedtls/ctr_drbg.h"
95 #include "mbedtls/certs.h"
96 #include "mbedtls/x509.h"
97 #include "mbedtls/ssl.h"
98 #include "mbedtls/net_sockets.h"
99 #include "mbedtls/error.h"
100
101 #if defined(MBEDTLS_SSL_CACHE_C)
102 #include "mbedtls/ssl_cache.h"
103 #endif
104
105 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
106 #include "mbedtls/memory_buffer_alloc.h"
107 #endif
108
109
110 #define HTTP_RESPONSE \
111 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
112 "<h2>mbed TLS Test Server</h2>\r\n" \
113 "<p>Successful connection using: %s</p>\r\n"
114
115 #define DEBUG_LEVEL 0
116
117 #define MAX_NUM_THREADS 5
118
119 mbedtls_threading_mutex_t debug_mutex;
120
my_mutexed_debug(void * ctx,int level,const char * file,int line,const char * str)121 static void my_mutexed_debug( void *ctx, int level,
122 const char *file, int line,
123 const char *str )
124 {
125 long int thread_id = (long int) pthread_self();
126
127 mbedtls_mutex_lock( &debug_mutex );
128
129 ((void) level);
130 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: [ #%ld ] %s",
131 file, line, thread_id, str );
132 fflush( (FILE *) ctx );
133
134 mbedtls_mutex_unlock( &debug_mutex );
135 }
136
137 typedef struct {
138 mbedtls_net_context client_fd;
139 int thread_complete;
140 const mbedtls_ssl_config *config;
141 } thread_info_t;
142
143 typedef struct {
144 int active;
145 thread_info_t data;
146 pthread_t thread;
147 } pthread_info_t;
148
149 static thread_info_t base_info;
150 static pthread_info_t threads[MAX_NUM_THREADS];
151
handle_ssl_connection(void * data)152 static void *handle_ssl_connection( void *data )
153 {
154 int ret, len;
155 thread_info_t *thread_info = (thread_info_t *) data;
156 mbedtls_net_context *client_fd = &thread_info->client_fd;
157 long int thread_id = (long int) pthread_self();
158 unsigned char buf[1024];
159 mbedtls_ssl_context ssl;
160
161 /* Make sure memory references are valid */
162 mbedtls_ssl_init( &ssl );
163
164 mbedtls_printf( " [ #%ld ] Setting up SSL/TLS data\n", thread_id );
165
166 /*
167 * 4. Get the SSL context ready
168 */
169 if( ( ret = mbedtls_ssl_setup( &ssl, thread_info->config ) ) != 0 )
170 {
171 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_setup returned -0x%04x\n",
172 thread_id, -ret );
173 goto thread_exit;
174 }
175
176 mbedtls_ssl_set_bio( &ssl, client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
177
178 /*
179 * 5. Handshake
180 */
181 mbedtls_printf( " [ #%ld ] Performing the SSL/TLS handshake\n", thread_id );
182
183 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
184 {
185 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
186 {
187 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_handshake returned -0x%04x\n",
188 thread_id, -ret );
189 goto thread_exit;
190 }
191 }
192
193 mbedtls_printf( " [ #%ld ] ok\n", thread_id );
194
195 /*
196 * 6. Read the HTTP Request
197 */
198 mbedtls_printf( " [ #%ld ] < Read from client\n", thread_id );
199
200 do
201 {
202 len = sizeof( buf ) - 1;
203 memset( buf, 0, sizeof( buf ) );
204 ret = mbedtls_ssl_read( &ssl, buf, len );
205
206 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
207 continue;
208
209 if( ret <= 0 )
210 {
211 switch( ret )
212 {
213 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
214 mbedtls_printf( " [ #%ld ] connection was closed gracefully\n",
215 thread_id );
216 goto thread_exit;
217
218 case MBEDTLS_ERR_NET_CONN_RESET:
219 mbedtls_printf( " [ #%ld ] connection was reset by peer\n",
220 thread_id );
221 goto thread_exit;
222
223 default:
224 mbedtls_printf( " [ #%ld ] mbedtls_ssl_read returned -0x%04x\n",
225 thread_id, -ret );
226 goto thread_exit;
227 }
228 }
229
230 len = ret;
231 mbedtls_printf( " [ #%ld ] %d bytes read\n=====\n%s\n=====\n",
232 thread_id, len, (char *) buf );
233
234 if( ret > 0 )
235 break;
236 }
237 while( 1 );
238
239 /*
240 * 7. Write the 200 Response
241 */
242 mbedtls_printf( " [ #%ld ] > Write to client:\n", thread_id );
243
244 len = sprintf( (char *) buf, HTTP_RESPONSE,
245 mbedtls_ssl_get_ciphersuite( &ssl ) );
246
247 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
248 {
249 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
250 {
251 mbedtls_printf( " [ #%ld ] failed: peer closed the connection\n",
252 thread_id );
253 goto thread_exit;
254 }
255
256 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
257 {
258 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_write returned -0x%04x\n",
259 thread_id, ret );
260 goto thread_exit;
261 }
262 }
263
264 len = ret;
265 mbedtls_printf( " [ #%ld ] %d bytes written\n=====\n%s\n=====\n",
266 thread_id, len, (char *) buf );
267
268 mbedtls_printf( " [ #%ld ] . Closing the connection...", thread_id );
269
270 while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
271 {
272 if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
273 ret != MBEDTLS_ERR_SSL_WANT_WRITE )
274 {
275 mbedtls_printf( " [ #%ld ] failed: mbedtls_ssl_close_notify returned -0x%04x\n",
276 thread_id, ret );
277 goto thread_exit;
278 }
279 }
280
281 mbedtls_printf( " ok\n" );
282
283 ret = 0;
284
285 thread_exit:
286
287 #ifdef MBEDTLS_ERROR_C
288 if( ret != 0 )
289 {
290 char error_buf[100];
291 mbedtls_strerror( ret, error_buf, 100 );
292 mbedtls_printf(" [ #%ld ] Last error was: -0x%04x - %s\n\n",
293 thread_id, -ret, error_buf );
294 }
295 #endif
296
297 mbedtls_net_free( client_fd );
298 mbedtls_ssl_free( &ssl );
299
300 thread_info->thread_complete = 1;
301
302 return( NULL );
303 }
304
thread_create(mbedtls_net_context * client_fd)305 static int thread_create( mbedtls_net_context *client_fd )
306 {
307 int ret, i;
308
309 /*
310 * Find in-active or finished thread slot
311 */
312 for( i = 0; i < MAX_NUM_THREADS; i++ )
313 {
314 if( threads[i].active == 0 )
315 break;
316
317 if( threads[i].data.thread_complete == 1 )
318 {
319 mbedtls_printf( " [ main ] Cleaning up thread %d\n", i );
320 pthread_join(threads[i].thread, NULL );
321 memset( &threads[i], 0, sizeof(pthread_info_t) );
322 break;
323 }
324 }
325
326 if( i == MAX_NUM_THREADS )
327 return( -1 );
328
329 /*
330 * Fill thread-info for thread
331 */
332 memcpy( &threads[i].data, &base_info, sizeof(base_info) );
333 threads[i].active = 1;
334 memcpy( &threads[i].data.client_fd, client_fd, sizeof( mbedtls_net_context ) );
335
336 if( ( ret = pthread_create( &threads[i].thread, NULL, handle_ssl_connection,
337 &threads[i].data ) ) != 0 )
338 {
339 return( ret );
340 }
341
342 return( 0 );
343 }
344
main(void)345 int main( void )
346 {
347 int ret;
348 mbedtls_net_context listen_fd, client_fd;
349 const char pers[] = "ssl_pthread_server";
350
351 mbedtls_entropy_context entropy;
352 mbedtls_ctr_drbg_context ctr_drbg;
353 mbedtls_ssl_config conf;
354 mbedtls_x509_crt srvcert;
355 mbedtls_x509_crt cachain;
356 mbedtls_pk_context pkey;
357 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
358 unsigned char alloc_buf[100000];
359 #endif
360 #if defined(MBEDTLS_SSL_CACHE_C)
361 mbedtls_ssl_cache_context cache;
362 #endif
363
364 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
365 mbedtls_memory_buffer_alloc_init( alloc_buf, sizeof(alloc_buf) );
366 #endif
367
368 #if defined(MBEDTLS_SSL_CACHE_C)
369 mbedtls_ssl_cache_init( &cache );
370 #endif
371
372 mbedtls_x509_crt_init( &srvcert );
373 mbedtls_x509_crt_init( &cachain );
374
375 mbedtls_ssl_config_init( &conf );
376 mbedtls_ctr_drbg_init( &ctr_drbg );
377 memset( threads, 0, sizeof(threads) );
378 mbedtls_net_init( &listen_fd );
379 mbedtls_net_init( &client_fd );
380
381 mbedtls_mutex_init( &debug_mutex );
382
383 base_info.config = &conf;
384
385 /*
386 * We use only a single entropy source that is used in all the threads.
387 */
388 mbedtls_entropy_init( &entropy );
389
390 /*
391 * 1. Load the certificates and private RSA key
392 */
393 mbedtls_printf( "\n . Loading the server cert. and key..." );
394 fflush( stdout );
395
396 /*
397 * This demonstration program uses embedded test certificates.
398 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
399 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
400 */
401 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
402 mbedtls_test_srv_crt_len );
403 if( ret != 0 )
404 {
405 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
406 goto exit;
407 }
408
409 ret = mbedtls_x509_crt_parse( &cachain, (const unsigned char *) mbedtls_test_cas_pem,
410 mbedtls_test_cas_pem_len );
411 if( ret != 0 )
412 {
413 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
414 goto exit;
415 }
416
417 mbedtls_pk_init( &pkey );
418 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
419 mbedtls_test_srv_key_len, NULL, 0 );
420 if( ret != 0 )
421 {
422 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
423 goto exit;
424 }
425
426 mbedtls_printf( " ok\n" );
427
428 /*
429 * 1b. Seed the random number generator
430 */
431 mbedtls_printf( " . Seeding the random number generator..." );
432
433 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
434 (const unsigned char *) pers,
435 strlen( pers ) ) ) != 0 )
436 {
437 mbedtls_printf( " failed: mbedtls_ctr_drbg_seed returned -0x%04x\n",
438 -ret );
439 goto exit;
440 }
441
442 mbedtls_printf( " ok\n" );
443
444 /*
445 * 1c. Prepare SSL configuration
446 */
447 mbedtls_printf( " . Setting up the SSL data...." );
448
449 if( ( ret = mbedtls_ssl_config_defaults( &conf,
450 MBEDTLS_SSL_IS_SERVER,
451 MBEDTLS_SSL_TRANSPORT_STREAM,
452 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
453 {
454 mbedtls_printf( " failed: mbedtls_ssl_config_defaults returned -0x%04x\n",
455 -ret );
456 goto exit;
457 }
458
459 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
460 mbedtls_ssl_conf_dbg( &conf, my_mutexed_debug, stdout );
461
462 /* mbedtls_ssl_cache_get() and mbedtls_ssl_cache_set() are thread-safe if
463 * MBEDTLS_THREADING_C is set.
464 */
465 #if defined(MBEDTLS_SSL_CACHE_C)
466 mbedtls_ssl_conf_session_cache( &conf, &cache,
467 mbedtls_ssl_cache_get,
468 mbedtls_ssl_cache_set );
469 #endif
470
471 mbedtls_ssl_conf_ca_chain( &conf, &cachain, NULL );
472 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
473 {
474 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
475 goto exit;
476 }
477
478 mbedtls_printf( " ok\n" );
479
480 /*
481 * 2. Setup the listening TCP socket
482 */
483 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
484 fflush( stdout );
485
486 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
487 {
488 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
489 goto exit;
490 }
491
492 mbedtls_printf( " ok\n" );
493
494 reset:
495 #ifdef MBEDTLS_ERROR_C
496 if( ret != 0 )
497 {
498 char error_buf[100];
499 mbedtls_strerror( ret, error_buf, 100 );
500 mbedtls_printf( " [ main ] Last error was: -0x%04x - %s\n", -ret, error_buf );
501 }
502 #endif
503
504 /*
505 * 3. Wait until a client connects
506 */
507 mbedtls_printf( " [ main ] Waiting for a remote connection\n" );
508
509 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
510 NULL, 0, NULL ) ) != 0 )
511 {
512 mbedtls_printf( " [ main ] failed: mbedtls_net_accept returned -0x%04x\n", ret );
513 goto exit;
514 }
515
516 mbedtls_printf( " [ main ] ok\n" );
517 mbedtls_printf( " [ main ] Creating a new thread\n" );
518
519 if( ( ret = thread_create( &client_fd ) ) != 0 )
520 {
521 mbedtls_printf( " [ main ] failed: thread_create returned %d\n", ret );
522 mbedtls_net_free( &client_fd );
523 goto reset;
524 }
525
526 ret = 0;
527 goto reset;
528
529 exit:
530 mbedtls_x509_crt_free( &srvcert );
531 mbedtls_pk_free( &pkey );
532 #if defined(MBEDTLS_SSL_CACHE_C)
533 mbedtls_ssl_cache_free( &cache );
534 #endif
535 mbedtls_ctr_drbg_free( &ctr_drbg );
536 mbedtls_entropy_free( &entropy );
537 mbedtls_ssl_config_free( &conf );
538
539 mbedtls_net_free( &listen_fd );
540
541 mbedtls_mutex_free( &debug_mutex );
542
543 #if defined(MBEDTLS_MEMORY_BUFFER_ALLOC_C)
544 mbedtls_memory_buffer_alloc_free();
545 #endif
546
547 #if defined(_WIN32)
548 mbedtls_printf( " Press Enter to exit this program.\n" );
549 fflush( stdout ); getchar();
550 #endif
551
552 mbedtls_exit( ret );
553 }
554
555 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
556 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
557 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_THREADING_C &&
558 MBEDTLS_THREADING_PTHREAD && MBEDTLS_PEM_PARSE_C */
559