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 mbedtls_printf(" failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret);
121 goto exit;
122 }
123
124 mbedtls_printf(" ok\n");
125
126 /*
127 * 2. Load the certificates and private RSA key
128 */
129 mbedtls_printf("\n . Loading the server cert. and key...");
130 fflush(stdout);
131
132 /*
133 * This demonstration program uses embedded test certificates.
134 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
135 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
136 */
137 ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_srv_crt,
138 mbedtls_test_srv_crt_len);
139 if (ret != 0) {
140 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret);
141 goto exit;
142 }
143
144 ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_cas_pem,
145 mbedtls_test_cas_pem_len);
146 if (ret != 0) {
147 mbedtls_printf(" failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret);
148 goto exit;
149 }
150
151 ret = mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
152 mbedtls_test_srv_key_len, NULL, 0,
153 mbedtls_ctr_drbg_random, &ctr_drbg);
154 if (ret != 0) {
155 mbedtls_printf(" failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret);
156 goto exit;
157 }
158
159 mbedtls_printf(" ok\n");
160
161 /*
162 * 3. Setup the listening TCP socket
163 */
164 mbedtls_printf(" . Bind on https://localhost:4433/ ...");
165 fflush(stdout);
166
167 if ((ret = mbedtls_net_bind(&listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP)) != 0) {
168 mbedtls_printf(" failed\n ! mbedtls_net_bind returned %d\n\n", ret);
169 goto exit;
170 }
171
172 mbedtls_printf(" ok\n");
173
174 /*
175 * 4. Setup stuff
176 */
177 mbedtls_printf(" . Setting up the SSL data....");
178 fflush(stdout);
179
180 if ((ret = mbedtls_ssl_config_defaults(&conf,
181 MBEDTLS_SSL_IS_SERVER,
182 MBEDTLS_SSL_TRANSPORT_STREAM,
183 MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
184 mbedtls_printf(" failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret);
185 goto exit;
186 }
187
188 mbedtls_ssl_conf_rng(&conf, mbedtls_ctr_drbg_random, &ctr_drbg);
189 mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
190
191 #if defined(MBEDTLS_SSL_CACHE_C)
192 mbedtls_ssl_conf_session_cache(&conf, &cache,
193 mbedtls_ssl_cache_get,
194 mbedtls_ssl_cache_set);
195 #endif
196
197 mbedtls_ssl_conf_ca_chain(&conf, srvcert.next, NULL);
198 if ((ret = mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey)) != 0) {
199 mbedtls_printf(" failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret);
200 goto exit;
201 }
202
203 if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
204 mbedtls_printf(" failed\n ! mbedtls_ssl_setup returned %d\n\n", ret);
205 goto exit;
206 }
207
208 mbedtls_printf(" ok\n");
209
210 reset:
211 #ifdef MBEDTLS_ERROR_C
212 if (ret != 0) {
213 char error_buf[100];
214 mbedtls_strerror(ret, error_buf, 100);
215 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
216 }
217 #endif
218
219 mbedtls_net_free(&client_fd);
220
221 mbedtls_ssl_session_reset(&ssl);
222
223 /*
224 * 3. Wait until a client connects
225 */
226 mbedtls_printf(" . Waiting for a remote connection ...");
227 fflush(stdout);
228
229 if ((ret = mbedtls_net_accept(&listen_fd, &client_fd,
230 NULL, 0, NULL)) != 0) {
231 mbedtls_printf(" failed\n ! mbedtls_net_accept returned %d\n\n", ret);
232 goto exit;
233 }
234
235 mbedtls_ssl_set_bio(&ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL);
236
237 mbedtls_printf(" ok\n");
238
239 /*
240 * 5. Handshake
241 */
242 mbedtls_printf(" . Performing the SSL/TLS handshake...");
243 fflush(stdout);
244
245 while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
246 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
247 mbedtls_printf(" failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret);
248 goto reset;
249 }
250 }
251
252 mbedtls_printf(" ok\n");
253
254 /*
255 * 6. Read the HTTP Request
256 */
257 mbedtls_printf(" < Read from client:");
258 fflush(stdout);
259
260 do {
261 len = sizeof(buf) - 1;
262 memset(buf, 0, sizeof(buf));
263 ret = mbedtls_ssl_read(&ssl, buf, len);
264
265 if (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE) {
266 continue;
267 }
268
269 if (ret <= 0) {
270 switch (ret) {
271 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
272 mbedtls_printf(" connection was closed gracefully\n");
273 break;
274
275 case MBEDTLS_ERR_NET_CONN_RESET:
276 mbedtls_printf(" connection was reset by peer\n");
277 break;
278
279 default:
280 mbedtls_printf(" mbedtls_ssl_read returned -0x%x\n", (unsigned int) -ret);
281 break;
282 }
283
284 break;
285 }
286
287 len = ret;
288 mbedtls_printf(" %d bytes read\n\n%s", len, (char *) buf);
289
290 if (ret > 0) {
291 break;
292 }
293 } while (1);
294
295 /*
296 * 7. Write the 200 Response
297 */
298 mbedtls_printf(" > Write to client:");
299 fflush(stdout);
300
301 len = sprintf((char *) buf, HTTP_RESPONSE,
302 mbedtls_ssl_get_ciphersuite(&ssl));
303
304 while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
305 if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
306 mbedtls_printf(" failed\n ! peer closed the connection\n\n");
307 goto reset;
308 }
309
310 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
311 mbedtls_printf(" failed\n ! mbedtls_ssl_write returned %d\n\n", ret);
312 goto exit;
313 }
314 }
315
316 len = ret;
317 mbedtls_printf(" %d bytes written\n\n%s\n", len, (char *) buf);
318
319 mbedtls_printf(" . Closing the connection...");
320
321 while ((ret = mbedtls_ssl_close_notify(&ssl)) < 0) {
322 if (ret != MBEDTLS_ERR_SSL_WANT_READ &&
323 ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
324 mbedtls_printf(" failed\n ! mbedtls_ssl_close_notify returned %d\n\n", ret);
325 goto reset;
326 }
327 }
328
329 mbedtls_printf(" ok\n");
330
331 ret = 0;
332 goto reset;
333
334 exit:
335
336 #ifdef MBEDTLS_ERROR_C
337 if (ret != 0) {
338 char error_buf[100];
339 mbedtls_strerror(ret, error_buf, 100);
340 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf);
341 }
342 #endif
343
344 mbedtls_net_free(&client_fd);
345 mbedtls_net_free(&listen_fd);
346
347 mbedtls_x509_crt_free(&srvcert);
348 mbedtls_pk_free(&pkey);
349 mbedtls_ssl_free(&ssl);
350 mbedtls_ssl_config_free(&conf);
351 #if defined(MBEDTLS_SSL_CACHE_C)
352 mbedtls_ssl_cache_free(&cache);
353 #endif
354 mbedtls_ctr_drbg_free(&ctr_drbg);
355 mbedtls_entropy_free(&entropy);
356
357 mbedtls_exit(ret);
358 }
359 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
360 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
361 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C
362 && MBEDTLS_FS_IO && MBEDTLS_PEM_PARSE_C */
363
