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 #include "mbedtls/platform.h"
23
24 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
25 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
26 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
27 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
28 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO)
main(void)29 int main( void )
30 {
31 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C "
32 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
33 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
34 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
35 "and/or MBEDTLS_PEM_PARSE_C not defined.\n");
36 mbedtls_exit( 0 );
37 }
38 #else
39
40 #include <stdlib.h>
41 #include <string.h>
42
43 #if defined(_WIN32)
44 #include <windows.h>
45 #endif
46
47 #include "mbedtls/entropy.h"
48 #include "mbedtls/ctr_drbg.h"
49 #include "mbedtls/x509.h"
50 #include "mbedtls/ssl.h"
51 #include "mbedtls/net_sockets.h"
52 #include "mbedtls/error.h"
53 #include "mbedtls/debug.h"
54 #include "test/certs.h"
55
56 #if defined(MBEDTLS_SSL_CACHE_C)
57 #include "mbedtls/ssl_cache.h"
58 #endif
59
60 #define HTTP_RESPONSE \
61 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
62 "<h2>mbed TLS Test Server</h2>\r\n" \
63 "<p>Successful connection using: %s</p>\r\n"
64
65 #define DEBUG_LEVEL 0
66
67
my_debug(void * ctx,int level,const char * file,int line,const char * str)68 static void my_debug( void *ctx, int level,
69 const char *file, int line,
70 const char *str )
71 {
72 ((void) level);
73
74 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
75 fflush( (FILE *) ctx );
76 }
77
main(void)78 int main( void )
79 {
80 int ret, len;
81 mbedtls_net_context listen_fd, client_fd;
82 unsigned char buf[1024];
83 const char *pers = "ssl_server";
84
85 mbedtls_entropy_context entropy;
86 mbedtls_ctr_drbg_context ctr_drbg;
87 mbedtls_ssl_context ssl;
88 mbedtls_ssl_config conf;
89 mbedtls_x509_crt srvcert;
90 mbedtls_pk_context pkey;
91 #if defined(MBEDTLS_SSL_CACHE_C)
92 mbedtls_ssl_cache_context cache;
93 #endif
94
95 mbedtls_net_init( &listen_fd );
96 mbedtls_net_init( &client_fd );
97 mbedtls_ssl_init( &ssl );
98 mbedtls_ssl_config_init( &conf );
99 #if defined(MBEDTLS_SSL_CACHE_C)
100 mbedtls_ssl_cache_init( &cache );
101 #endif
102 mbedtls_x509_crt_init( &srvcert );
103 mbedtls_pk_init( &pkey );
104 mbedtls_entropy_init( &entropy );
105 mbedtls_ctr_drbg_init( &ctr_drbg );
106
107 #if defined(MBEDTLS_DEBUG_C)
108 mbedtls_debug_set_threshold( DEBUG_LEVEL );
109 #endif
110
111 /*
112 * 1. Seed the RNG
113 */
114 mbedtls_printf( " . Seeding the random number generator..." );
115 fflush( stdout );
116
117 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
118 (const unsigned char *) pers,
119 strlen( pers ) ) ) != 0 )
120 {
121 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
122 goto exit;
123 }
124
125 mbedtls_printf( " ok\n" );
126
127 /*
128 * 2. Load the certificates and private RSA key
129 */
130 mbedtls_printf( "\n . Loading the server cert. and key..." );
131 fflush( stdout );
132
133 /*
134 * This demonstration program uses embedded test certificates.
135 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
136 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
137 */
138 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
139 mbedtls_test_srv_crt_len );
140 if( ret != 0 )
141 {
142 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
143 goto exit;
144 }
145
146 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
147 mbedtls_test_cas_pem_len );
148 if( ret != 0 )
149 {
150 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
151 goto exit;
152 }
153
154 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
155 mbedtls_test_srv_key_len, NULL, 0,
156 mbedtls_ctr_drbg_random, &ctr_drbg );
157 if( ret != 0 )
158 {
159 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
160 goto exit;
161 }
162
163 mbedtls_printf( " ok\n" );
164
165 /*
166 * 3. Setup the listening TCP socket
167 */
168 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
169 fflush( stdout );
170
171 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
172 {
173 mbedtls_printf( " failed\n ! mbedtls_net_bind returned %d\n\n", ret );
174 goto exit;
175 }
176
177 mbedtls_printf( " ok\n" );
178
179 /*
180 * 4. Setup stuff
181 */
182 mbedtls_printf( " . Setting up the SSL data...." );
183 fflush( stdout );
184
185 if( ( ret = mbedtls_ssl_config_defaults( &conf,
186 MBEDTLS_SSL_IS_SERVER,
187 MBEDTLS_SSL_TRANSPORT_STREAM,
188 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
189 {
190 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
191 goto exit;
192 }
193
194 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
195 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
196
197 #if defined(MBEDTLS_SSL_CACHE_C)
198 mbedtls_ssl_conf_session_cache( &conf, &cache,
199 mbedtls_ssl_cache_get,
200 mbedtls_ssl_cache_set );
201 #endif
202
203 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
204 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
205 {
206 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
207 goto exit;
208 }
209
210 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
211 {
212 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
213 goto exit;
214 }
215
216 mbedtls_printf( " ok\n" );
217
218 reset:
219 #ifdef MBEDTLS_ERROR_C
220 if( ret != 0 )
221 {
222 char error_buf[100];
223 mbedtls_strerror( ret, error_buf, 100 );
224 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
225 }
226 #endif
227
228 mbedtls_net_free( &client_fd );
229
230 mbedtls_ssl_session_reset( &ssl );
231
232 /*
233 * 3. Wait until a client connects
234 */
235 mbedtls_printf( " . Waiting for a remote connection ..." );
236 fflush( stdout );
237
238 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
239 NULL, 0, NULL ) ) != 0 )
240 {
241 mbedtls_printf( " failed\n ! mbedtls_net_accept returned %d\n\n", ret );
242 goto exit;
243 }
244
245 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
246
247 mbedtls_printf( " ok\n" );
248
249 /*
250 * 5. Handshake
251 */
252 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
253 fflush( stdout );
254
255 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
256 {
257 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
258 {
259 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
260 goto reset;
261 }
262 }
263
264 mbedtls_printf( " ok\n" );
265
266 /*
267 * 6. Read the HTTP Request
268 */
269 mbedtls_printf( " < Read from client:" );
270 fflush( stdout );
271
272 do
273 {
274 len = sizeof( buf ) - 1;
275 memset( buf, 0, sizeof( buf ) );
276 ret = mbedtls_ssl_read( &ssl, buf, len );
277
278 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
279 continue;
280
281 if( ret <= 0 )
282 {
283 switch( ret )
284 {
285 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
286 mbedtls_printf( " connection was closed gracefully\n" );
287 break;
288
289 case MBEDTLS_ERR_NET_CONN_RESET:
290 mbedtls_printf( " connection was reset by peer\n" );
291 break;
292
293 default:
294 mbedtls_printf( " mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret );
295 break;
296 }
297
298 break;
299 }
300
301 len = ret;
302 mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
303
304 if( ret > 0 )
305 break;
306 }
307 while( 1 );
308
309 /*
310 * 7. Write the 200 Response
311 */
312 mbedtls_printf( " > Write to client:" );
313 fflush( stdout );
314
315 len = sprintf( (char *) buf, HTTP_RESPONSE,
316 mbedtls_ssl_get_ciphersuite( &ssl ) );
317
318 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
319 {
320 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
321 {
322 mbedtls_printf( " failed\n ! peer closed the connection\n\n" );
323 goto reset;
324 }
325
326 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
327 {
328 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
329 goto exit;
330 }
331 }
332
333 len = ret;
334 mbedtls_printf( " %d bytes written\n\n%s\n", len, (char *) buf );
335
336 mbedtls_printf( " . Closing the connection..." );
337
338 while( ( ret = mbedtls_ssl_close_notify( &ssl ) ) < 0 )
339 {
340 if( ret != MBEDTLS_ERR_SSL_WANT_READ &&
341 ret != MBEDTLS_ERR_SSL_WANT_WRITE )
342 {
343 mbedtls_printf( " failed\n ! mbedtls_ssl_close_notify returned %d\n\n", ret );
344 goto reset;
345 }
346 }
347
348 mbedtls_printf( " ok\n" );
349
350 ret = 0;
351 goto reset;
352
353 exit:
354
355 #ifdef MBEDTLS_ERROR_C
356 if( ret != 0 )
357 {
358 char error_buf[100];
359 mbedtls_strerror( ret, error_buf, 100 );
360 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
361 }
362 #endif
363
364 mbedtls_net_free( &client_fd );
365 mbedtls_net_free( &listen_fd );
366
367 mbedtls_x509_crt_free( &srvcert );
368 mbedtls_pk_free( &pkey );
369 mbedtls_ssl_free( &ssl );
370 mbedtls_ssl_config_free( &conf );
371 #if defined(MBEDTLS_SSL_CACHE_C)
372 mbedtls_ssl_cache_free( &cache );
373 #endif
374 mbedtls_ctr_drbg_free( &ctr_drbg );
375 mbedtls_entropy_free( &entropy );
376
377 mbedtls_exit( ret );
378 }
379 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
380 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
381 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
382 && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
383
