1 /*
2 * SSL server demonstration program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 #include "mbedtls/build_info.h"
21
22 #if defined(MBEDTLS_PLATFORM_C)
23 #include "mbedtls/platform.h"
24 #else
25 #include <stdio.h>
26 #include <stdlib.h>
27 #define mbedtls_time time
28 #define mbedtls_time_t time_t
29 #define mbedtls_fprintf fprintf
30 #define mbedtls_printf printf
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_PEM_PARSE_C) || \
37 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
38 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
39 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
40 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO)
main(void)41 int main( void )
42 {
43 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C "
44 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
45 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
46 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
47 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
48 mbedtls_exit( 0 );
49 }
50 #else
51
52 #include <stdlib.h>
53 #include <string.h>
54
55 #if defined(_WIN32)
56 #include <windows.h>
57 #endif
58
59 #include "mbedtls/entropy.h"
60 #include "mbedtls/ctr_drbg.h"
61 #include "mbedtls/x509.h"
62 #include "mbedtls/ssl.h"
63 #include "mbedtls/net_sockets.h"
64 #include "mbedtls/error.h"
65 #include "mbedtls/debug.h"
66 #include "test/certs.h"
67
68 #if defined(MBEDTLS_SSL_CACHE_C)
69 #include "mbedtls/ssl_cache.h"
70 #endif
71
72 #define HTTP_RESPONSE \
73 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
74 "<h2>mbed TLS Test Server</h2>\r\n" \
75 "<p>Successful connection using: %s</p>\r\n"
76
77 #define DEBUG_LEVEL 0
78
79
my_debug(void * ctx,int level,const char * file,int line,const char * str)80 static void my_debug( void *ctx, int level,
81 const char *file, int line,
82 const char *str )
83 {
84 ((void) level);
85
86 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
87 fflush( (FILE *) ctx );
88 }
89
main(void)90 int main( void )
91 {
92 int ret, len;
93 mbedtls_net_context listen_fd, client_fd;
94 unsigned char buf[1024];
95 const char *pers = "ssl_server";
96
97 mbedtls_entropy_context entropy;
98 mbedtls_ctr_drbg_context ctr_drbg;
99 mbedtls_ssl_context ssl;
100 mbedtls_ssl_config conf;
101 mbedtls_x509_crt srvcert;
102 mbedtls_pk_context pkey;
103 #if defined(MBEDTLS_SSL_CACHE_C)
104 mbedtls_ssl_cache_context cache;
105 #endif
106
107 mbedtls_net_init( &listen_fd );
108 mbedtls_net_init( &client_fd );
109 mbedtls_ssl_init( &ssl );
110 mbedtls_ssl_config_init( &conf );
111 #if defined(MBEDTLS_SSL_CACHE_C)
112 mbedtls_ssl_cache_init( &cache );
113 #endif
114 mbedtls_x509_crt_init( &srvcert );
115 mbedtls_pk_init( &pkey );
116 mbedtls_entropy_init( &entropy );
117 mbedtls_ctr_drbg_init( &ctr_drbg );
118
119 #if defined(MBEDTLS_DEBUG_C)
120 mbedtls_debug_set_threshold( DEBUG_LEVEL );
121 #endif
122
123 /*
124 * 1. Seed the RNG
125 */
126 mbedtls_printf( " . Seeding the random number generator..." );
127 fflush( stdout );
128
129 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
130 (const unsigned char *) pers,
131 strlen( pers ) ) ) != 0 )
132 {
133 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
134 goto exit;
135 }
136
137 mbedtls_printf( " ok\n" );
138
139 /*
140 * 2. Load the certificates and private RSA key
141 */
142 mbedtls_printf( "\n . Loading the server cert. and key..." );
143 fflush( stdout );
144
145 /*
146 * This demonstration program uses embedded test certificates.
147 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
148 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
149 */
150 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
151 mbedtls_test_srv_crt_len );
152 if( ret != 0 )
153 {
154 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
155 goto exit;
156 }
157
158 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
159 mbedtls_test_cas_pem_len );
160 if( ret != 0 )
161 {
162 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
163 goto exit;
164 }
165
166 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
167 mbedtls_test_srv_key_len, NULL, 0,
168 mbedtls_ctr_drbg_random, &ctr_drbg );
169 if( ret != 0 )
170 {
171 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
172 goto exit;
173 }
174
175 mbedtls_printf( " ok\n" );
176
177 /*
178 * 3. Setup the listening TCP socket
179 */
180 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
181 fflush( stdout );
182
183 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
184 {
185 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
186 goto exit;
187 }
188
189 mbedtls_printf( " ok\n" );
190
191 /*
192 * 4. Setup stuff
193 */
194 mbedtls_printf( " . Setting up the SSL data...." );
195 fflush( stdout );
196
197 if( ( ret = mbedtls_ssl_config_defaults( &conf,
198 MBEDTLS_SSL_IS_SERVER,
199 MBEDTLS_SSL_TRANSPORT_STREAM,
200 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
201 {
202 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
203 goto exit;
204 }
205
206 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
207 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
208
209 #if defined(MBEDTLS_SSL_CACHE_C)
210 mbedtls_ssl_conf_session_cache( &conf, &cache,
211 mbedtls_ssl_cache_get,
212 mbedtls_ssl_cache_set );
213 #endif
214
215 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
216 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
217 {
218 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
219 goto exit;
220 }
221
222 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
223 {
224 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
225 goto exit;
226 }
227
228 mbedtls_printf( " ok\n" );
229
230 reset:
231 #ifdef MBEDTLS_ERROR_C
232 if( ret != 0 )
233 {
234 char error_buf[100];
235 mbedtls_strerror( ret, error_buf, 100 );
236 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
237 }
238 #endif
239
240 mbedtls_net_free( &client_fd );
241
242 mbedtls_ssl_session_reset( &ssl );
243
244 /*
245 * 3. Wait until a client connects
246 */
247 mbedtls_printf( " . Waiting for a remote connection ..." );
248 fflush( stdout );
249
250 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
251 NULL, 0, NULL ) ) != 0 )
252 {
253 mbedtls_printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
254 goto exit;
255 }
256
257 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
258
259 mbedtls_printf( " ok\n" );
260
261 /*
262 * 5. Handshake
263 */
264 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
265 fflush( stdout );
266
267 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
268 {
269 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
270 {
271 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
272 goto reset;
273 }
274 }
275
276 mbedtls_printf( " ok\n" );
277
278 /*
279 * 6. Read the HTTP Request
280 */
281 mbedtls_printf( " < Read from client:" );
282 fflush( stdout );
283
284 do
285 {
286 len = sizeof( buf ) - 1;
287 memset( buf, 0, sizeof( buf ) );
288 ret = mbedtls_ssl_read( &ssl, buf, len );
289
290 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
291 continue;
292
293 if( ret <= 0 )
294 {
295 switch( ret )
296 {
297 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
298 mbedtls_printf( " connection was closed gracefully\n" );
299 break;
300
301 case MBEDTLS_ERR_NET_CONN_RESET:
302 mbedtls_printf( " connection was reset by peer\n" );
303 break;
304
305 default:
306 mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
307 break;
308 }
309
310 break;
311 }
312
313 len = ret;
314 mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
315
316 if( ret > 0 )
317 break;
318 }
319 while( 1 );
320
321 /*
322 * 7. Write the 200 Response
323 */
324 mbedtls_printf( " > Write to client:" );
325 fflush( stdout );
326
327 len = sprintf( (char *) buf, HTTP_RESPONSE,
328 mbedtls_ssl_get_ciphersuite( &ssl ) );
329
330 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
331 {
332 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
333 {
334 mbedtls_printf( " failed\n ! peer closed the connection\n\n" );
335 goto reset;
336 }
337
338 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
339 {
340 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
341 goto exit;
342 }
343 }
344
345 len = ret;
346 mbedtls_printf( " %d bytes written\n\n%s\n", len, (char *) buf );
347
348 mbedtls_printf( " . Closing the connection..." );
349
350 while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
351 {
352 if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
353 ret != MBEDTLS_ERR_SSL_WANT_WRITE )
354 {
355 mbedtls_printf( " failed\n ! mbedtls_ssl_close_notify returned %d\n\n", ret );
356 goto reset;
357 }
358 }
359
360 mbedtls_printf( " ok\n" );
361
362 ret = 0;
363 goto reset;
364
365 exit:
366
367 #ifdef MBEDTLS_ERROR_C
368 if( ret != 0 )
369 {
370 char error_buf[100];
371 mbedtls_strerror( ret, error_buf, 100 );
372 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
373 }
374 #endif
375
376 mbedtls_net_free( &client_fd );
377 mbedtls_net_free( &listen_fd );
378
379 mbedtls_x509_crt_free( &srvcert );
380 mbedtls_pk_free( &pkey );
381 mbedtls_ssl_free( &ssl );
382 mbedtls_ssl_config_free( &conf );
383 #if defined(MBEDTLS_SSL_CACHE_C)
384 mbedtls_ssl_cache_free( &cache );
385 #endif
386 mbedtls_ctr_drbg_free( &ctr_drbg );
387 mbedtls_entropy_free( &entropy );
388
389 #if defined(_WIN32)
390 mbedtls_printf( " Press Enter to exit this program.\n" );
391 fflush( stdout ); getchar();
392 #endif
393
394 mbedtls_exit( ret );
395 }
396 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
397 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
398 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
399 && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
400