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