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