1 /*
2 * SSL server demonstration program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 *
7 * This file is provided under the Apache License 2.0, or the
8 * GNU General Public License v2.0 or later.
9 *
10 * **********
11 * Apache License 2.0:
12 *
13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
14 * not use this file except in compliance with the License.
15 * You may obtain a copy of the License at
16 *
17 * http://www.apache.org/licenses/LICENSE-2.0
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
24 *
25 * **********
26 *
27 * **********
28 * GNU General Public License v2.0 or later:
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
43 *
44 * **********
45 */
46
47 #if !defined(MBEDTLS_CONFIG_FILE)
48 #include "mbedtls/config.h"
49 #else
50 #include MBEDTLS_CONFIG_FILE
51 #endif
52
53 #if defined(MBEDTLS_PLATFORM_C)
54 #include "mbedtls/platform.h"
55 #else
56 #include <stdio.h>
57 #include <stdlib.h>
58 #define mbedtls_time time
59 #define mbedtls_time_t time_t
60 #define mbedtls_fprintf fprintf
61 #define mbedtls_printf printf
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_PEM_PARSE_C)
main(void)73 int main( void )
74 {
75 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
76 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
77 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
78 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
79 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
80 mbedtls_exit( 0 );
81 }
82 #else
83
84 #include <stdlib.h>
85 #include <string.h>
86
87 #if defined(_WIN32)
88 #include <windows.h>
89 #endif
90
91 #include "mbedtls/entropy.h"
92 #include "mbedtls/ctr_drbg.h"
93 #include "mbedtls/certs.h"
94 #include "mbedtls/x509.h"
95 #include "mbedtls/ssl.h"
96 #include "mbedtls/net_sockets.h"
97 #include "mbedtls/error.h"
98 #include "mbedtls/debug.h"
99
100 #if defined(MBEDTLS_SSL_CACHE_C)
101 #include "mbedtls/ssl_cache.h"
102 #endif
103
104 #define HTTP_RESPONSE \
105 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
106 "<h2>mbed TLS Test Server</h2>\r\n" \
107 "<p>Successful connection using: %s</p>\r\n"
108
109 #define DEBUG_LEVEL 0
110
111
my_debug(void * ctx,int level,const char * file,int line,const char * str)112 static void my_debug( void *ctx, int level,
113 const char *file, int line,
114 const char *str )
115 {
116 ((void) level);
117
118 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
119 fflush( (FILE *) ctx );
120 }
121
main(void)122 int main( void )
123 {
124 int ret, len;
125 mbedtls_net_context listen_fd, client_fd;
126 unsigned char buf[1024];
127 const char *pers = "ssl_server";
128
129 mbedtls_entropy_context entropy;
130 mbedtls_ctr_drbg_context ctr_drbg;
131 mbedtls_ssl_context ssl;
132 mbedtls_ssl_config conf;
133 mbedtls_x509_crt srvcert;
134 mbedtls_pk_context pkey;
135 #if defined(MBEDTLS_SSL_CACHE_C)
136 mbedtls_ssl_cache_context cache;
137 #endif
138
139 mbedtls_net_init( &listen_fd );
140 mbedtls_net_init( &client_fd );
141 mbedtls_ssl_init( &ssl );
142 mbedtls_ssl_config_init( &conf );
143 #if defined(MBEDTLS_SSL_CACHE_C)
144 mbedtls_ssl_cache_init( &cache );
145 #endif
146 mbedtls_x509_crt_init( &srvcert );
147 mbedtls_pk_init( &pkey );
148 mbedtls_entropy_init( &entropy );
149 mbedtls_ctr_drbg_init( &ctr_drbg );
150
151 #if defined(MBEDTLS_DEBUG_C)
152 mbedtls_debug_set_threshold( DEBUG_LEVEL );
153 #endif
154
155 /*
156 * 1. Load the certificates and private RSA key
157 */
158 mbedtls_printf( "\n . Loading the server cert. and key..." );
159 fflush( stdout );
160
161 /*
162 * This demonstration program uses embedded test certificates.
163 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
164 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
165 */
166 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
167 mbedtls_test_srv_crt_len );
168 if( ret != 0 )
169 {
170 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
171 goto exit;
172 }
173
174 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
175 mbedtls_test_cas_pem_len );
176 if( ret != 0 )
177 {
178 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
179 goto exit;
180 }
181
182 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
183 mbedtls_test_srv_key_len, NULL, 0 );
184 if( ret != 0 )
185 {
186 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
187 goto exit;
188 }
189
190 mbedtls_printf( " ok\n" );
191
192 /*
193 * 2. Setup the listening TCP socket
194 */
195 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
196 fflush( stdout );
197
198 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
199 {
200 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
201 goto exit;
202 }
203
204 mbedtls_printf( " ok\n" );
205
206 /*
207 * 3. Seed the RNG
208 */
209 mbedtls_printf( " . Seeding the random number generator..." );
210 fflush( stdout );
211
212 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
213 (const unsigned char *) pers,
214 strlen( pers ) ) ) != 0 )
215 {
216 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
217 goto exit;
218 }
219
220 mbedtls_printf( " ok\n" );
221
222 /*
223 * 4. Setup stuff
224 */
225 mbedtls_printf( " . Setting up the SSL data...." );
226 fflush( stdout );
227
228 if( ( ret = mbedtls_ssl_config_defaults( &conf,
229 MBEDTLS_SSL_IS_SERVER,
230 MBEDTLS_SSL_TRANSPORT_STREAM,
231 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
232 {
233 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
234 goto exit;
235 }
236
237 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
238 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
239
240 #if defined(MBEDTLS_SSL_CACHE_C)
241 mbedtls_ssl_conf_session_cache( &conf, &cache,
242 mbedtls_ssl_cache_get,
243 mbedtls_ssl_cache_set );
244 #endif
245
246 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
247 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
248 {
249 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
250 goto exit;
251 }
252
253 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
254 {
255 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
256 goto exit;
257 }
258
259 mbedtls_printf( " ok\n" );
260
261 reset:
262 #ifdef MBEDTLS_ERROR_C
263 if( ret != 0 )
264 {
265 char error_buf[100];
266 mbedtls_strerror( ret, error_buf, 100 );
267 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
268 }
269 #endif
270
271 mbedtls_net_free( &client_fd );
272
273 mbedtls_ssl_session_reset( &ssl );
274
275 /*
276 * 3. Wait until a client connects
277 */
278 mbedtls_printf( " . Waiting for a remote connection ..." );
279 fflush( stdout );
280
281 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
282 NULL, 0, NULL ) ) != 0 )
283 {
284 mbedtls_printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
285 goto exit;
286 }
287
288 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
289
290 mbedtls_printf( " ok\n" );
291
292 /*
293 * 5. Handshake
294 */
295 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
296 fflush( stdout );
297
298 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
299 {
300 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
301 {
302 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
303 goto reset;
304 }
305 }
306
307 mbedtls_printf( " ok\n" );
308
309 /*
310 * 6. Read the HTTP Request
311 */
312 mbedtls_printf( " < Read from client:" );
313 fflush( stdout );
314
315 do
316 {
317 len = sizeof( buf ) - 1;
318 memset( buf, 0, sizeof( buf ) );
319 ret = mbedtls_ssl_read( &ssl, buf, len );
320
321 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
322 continue;
323
324 if( ret <= 0 )
325 {
326 switch( ret )
327 {
328 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
329 mbedtls_printf( " connection was closed gracefully\n" );
330 break;
331
332 case MBEDTLS_ERR_NET_CONN_RESET:
333 mbedtls_printf( " connection was reset by peer\n" );
334 break;
335
336 default:
337 mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", -ret );
338 break;
339 }
340
341 break;
342 }
343
344 len = ret;
345 mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
346
347 if( ret > 0 )
348 break;
349 }
350 while( 1 );
351
352 /*
353 * 7. Write the 200 Response
354 */
355 mbedtls_printf( " > Write to client:" );
356 fflush( stdout );
357
358 len = sprintf( (char *) buf, HTTP_RESPONSE,
359 mbedtls_ssl_get_ciphersuite( &ssl ) );
360
361 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
362 {
363 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
364 {
365 mbedtls_printf( " failed\n ! peer closed the connection\n\n" );
366 goto reset;
367 }
368
369 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
370 {
371 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
372 goto exit;
373 }
374 }
375
376 len = ret;
377 mbedtls_printf( " %d bytes written\n\n%s\n", len, (char *) buf );
378
379 mbedtls_printf( " . Closing the connection..." );
380
381 while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
382 {
383 if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
384 ret != MBEDTLS_ERR_SSL_WANT_WRITE )
385 {
386 mbedtls_printf( " failed\n ! mbedtls_ssl_close_notify returned %d\n\n", ret );
387 goto reset;
388 }
389 }
390
391 mbedtls_printf( " ok\n" );
392
393 ret = 0;
394 goto reset;
395
396 exit:
397
398 #ifdef MBEDTLS_ERROR_C
399 if( ret != 0 )
400 {
401 char error_buf[100];
402 mbedtls_strerror( ret, error_buf, 100 );
403 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
404 }
405 #endif
406
407 mbedtls_net_free( &client_fd );
408 mbedtls_net_free( &listen_fd );
409
410 mbedtls_x509_crt_free( &srvcert );
411 mbedtls_pk_free( &pkey );
412 mbedtls_ssl_free( &ssl );
413 mbedtls_ssl_config_free( &conf );
414 #if defined(MBEDTLS_SSL_CACHE_C)
415 mbedtls_ssl_cache_free( &cache );
416 #endif
417 mbedtls_ctr_drbg_free( &ctr_drbg );
418 mbedtls_entropy_free( &entropy );
419
420 #if defined(_WIN32)
421 mbedtls_printf( " Press Enter to exit this program.\n" );
422 fflush( stdout ); getchar();
423 #endif
424
425 mbedtls_exit( ret );
426 }
427 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
428 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
429 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
430 && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
431