1 /*
2 * SSL server demonstration program using fork() for handling multiple clients
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 */
7
8 #define MBEDTLS_DECLARE_PRIVATE_IDENTIFIERS
9
10 #include "mbedtls/build_info.h"
11
12 #include "mbedtls/platform.h"
13
14 #if !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
15 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_SSL_SRV_C) || \
16 !defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
main(void)17 int main(void)
18 {
19 mbedtls_printf("MBEDTLS_ENTROPY_C and/or MBEDTLS_CTR_DRBG_C and/or "
20 "MBEDTLS_NET_C and/or MBEDTLS_SSL_SRV_C and/or "
21 "MBEDTLS_PEM_PARSE_C and/or MBEDTLS_X509_CRT_PARSE_C "
22 "not defined.\n");
23 mbedtls_exit(0);
24 }
25 #elif defined(_WIN32)
main(void)26 int main(void)
27 {
28 mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
29 "to work correctly.\n");
30 mbedtls_exit(0);
31 }
32 #else
33
34 #include "mbedtls/entropy.h"
35 #include "mbedtls/ctr_drbg.h"
36 #include "test/certs.h"
37 #include "mbedtls/x509.h"
38 #include "mbedtls/ssl.h"
39 #include "mbedtls/net_sockets.h"
40 #include "mbedtls/timing.h"
41
42 #include <string.h>
43 #include <signal.h>
44
45 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
46 #include <unistd.h>
47 #endif
48
49 #define HTTP_RESPONSE \
50 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
51 "<h2>Mbed TLS Test Server</h2>\r\n" \
52 "<p>Successful connection using: %s</p>\r\n"
53
54 #define DEBUG_LEVEL 0
55
56
my_debug(void * ctx,int level,const char * file,int line,const char * str)57 static void my_debug(void *ctx, int level,
58 const char *file, int line,
59 const char *str)
60 {
61 ((void) level);
62
63 mbedtls_fprintf((FILE *) ctx, "%s:%04d: %s", file, line, str);
64 fflush((FILE *) ctx);
65 }
66
main(void)67 int main(void)
68 {
69 int ret = 1, len, cnt = 0, pid;
70 int exit_code = MBEDTLS_EXIT_FAILURE;
71 mbedtls_net_context listen_fd, client_fd;
72 unsigned char buf[1024];
73 const char *pers = "ssl_fork_server";
74
75 mbedtls_entropy_context entropy;
76 mbedtls_ctr_drbg_context ctr_drbg;
77 mbedtls_ssl_context ssl;
78 mbedtls_ssl_config conf;
79 mbedtls_x509_crt srvcert;
80 mbedtls_pk_context pkey;
81
82 mbedtls_net_init(&listen_fd);
83 mbedtls_net_init(&client_fd);
84 mbedtls_ssl_init(&ssl);
85 mbedtls_ssl_config_init(&conf);
86 mbedtls_entropy_init(&entropy);
87 mbedtls_pk_init(&pkey);
88 mbedtls_x509_crt_init(&srvcert);
89 mbedtls_ctr_drbg_init(&ctr_drbg);
90
91 psa_status_t status = psa_crypto_init();
92 if (status != PSA_SUCCESS) {
93 mbedtls_fprintf(stderr, "Failed to initialize PSA Crypto implementation: %d\n",
94 (int) status);
95 goto exit;
96 }
97
98 signal(SIGCHLD, SIG_IGN);
99
100 /*
101 * 0. Initial seeding of the RNG
102 */
103 mbedtls_printf("\n . Initial seeding of the random generator...");
104 fflush(stdout);
105
106 if ((ret = mbedtls_ctr_drbg_seed(&ctr_drbg, mbedtls_entropy_func, &entropy,
107 (const unsigned char *) pers,
108 strlen(pers))) != 0) {
109 mbedtls_printf(" failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret);
110 goto exit;
111 }
112
113 mbedtls_printf(" ok\n");
114
115 /*
116 * 1. Load the certificates and private RSA key
117 */
118 mbedtls_printf(" . Loading the server cert. and key...");
119 fflush(stdout);
120
121 /*
122 * This demonstration program uses embedded test certificates.
123 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
124 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
125 */
126 ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_srv_crt,
127 mbedtls_test_srv_crt_len);
128 if (ret != 0) {
129 mbedtls_printf(" failed! mbedtls_x509_crt_parse returned %d\n\n", ret);
130 goto exit;
131 }
132
133 ret = mbedtls_x509_crt_parse(&srvcert, (const unsigned char *) mbedtls_test_cas_pem,
134 mbedtls_test_cas_pem_len);
135 if (ret != 0) {
136 mbedtls_printf(" failed! mbedtls_x509_crt_parse returned %d\n\n", ret);
137 goto exit;
138 }
139
140 ret = mbedtls_pk_parse_key(&pkey, (const unsigned char *) mbedtls_test_srv_key,
141 mbedtls_test_srv_key_len, NULL, 0);
142 if (ret != 0) {
143 mbedtls_printf(" failed! mbedtls_pk_parse_key returned %d\n\n", ret);
144 goto exit;
145 }
146
147 mbedtls_printf(" ok\n");
148
149 /*
150 * 1b. Prepare SSL configuration
151 */
152 mbedtls_printf(" . Configuring SSL...");
153 fflush(stdout);
154
155 if ((ret = mbedtls_ssl_config_defaults(&conf,
156 MBEDTLS_SSL_IS_SERVER,
157 MBEDTLS_SSL_TRANSPORT_STREAM,
158 MBEDTLS_SSL_PRESET_DEFAULT)) != 0) {
159 mbedtls_printf(" failed! mbedtls_ssl_config_defaults returned %d\n\n", ret);
160 goto exit;
161 }
162
163 mbedtls_ssl_conf_dbg(&conf, my_debug, stdout);
164
165 mbedtls_ssl_conf_ca_chain(&conf, srvcert.next, NULL);
166 if ((ret = mbedtls_ssl_conf_own_cert(&conf, &srvcert, &pkey)) != 0) {
167 mbedtls_printf(" failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret);
168 goto exit;
169 }
170
171 mbedtls_printf(" ok\n");
172
173 /*
174 * 2. Setup the listening TCP socket
175 */
176 mbedtls_printf(" . Bind on https://localhost:4433/ ...");
177 fflush(stdout);
178
179 if ((ret = mbedtls_net_bind(&listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP)) != 0) {
180 mbedtls_printf(" failed! mbedtls_net_bind returned %d\n\n", ret);
181 goto exit;
182 }
183
184 mbedtls_printf(" ok\n");
185
186 while (1) {
187 /*
188 * 3. Wait until a client connects
189 */
190 mbedtls_net_init(&client_fd);
191 mbedtls_ssl_init(&ssl);
192
193 mbedtls_printf(" . Waiting for a remote connection ...\n");
194 fflush(stdout);
195
196 if ((ret = mbedtls_net_accept(&listen_fd, &client_fd,
197 NULL, 0, NULL)) != 0) {
198 mbedtls_printf(" failed! mbedtls_net_accept returned %d\n\n", ret);
199 goto exit;
200 }
201
202 /*
203 * 3.5. Forking server thread
204 */
205
206 mbedtls_printf(" . Forking to handle connection ...");
207 fflush(stdout);
208
209 pid = fork();
210
211 if (pid < 0) {
212 mbedtls_printf(" failed! fork returned %d\n\n", pid);
213 goto exit;
214 }
215
216 if (pid != 0) {
217 mbedtls_printf(" ok\n");
218 mbedtls_net_close(&client_fd);
219 fflush(stdout);
220
221 if ((ret = mbedtls_ctr_drbg_reseed(&ctr_drbg,
222 (const unsigned char *) "parent",
223 6)) != 0) {
224 mbedtls_printf(" failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret);
225 goto exit;
226 }
227
228 continue;
229 }
230
231 mbedtls_net_close(&listen_fd);
232
233 pid = getpid();
234
235 /*
236 * 4. Setup stuff
237 */
238 mbedtls_printf("pid %d: Setting up the SSL data.\n", pid);
239 fflush(stdout);
240
241 if ((ret = mbedtls_ctr_drbg_reseed(&ctr_drbg,
242 (const unsigned char *) "child",
243 5)) != 0) {
244 mbedtls_printf(
245 "pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
246 pid, ret);
247 goto exit;
248 }
249
250 if ((ret = mbedtls_ssl_setup(&ssl, &conf)) != 0) {
251 mbedtls_printf(
252 "pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
253 pid, 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("pid %d: SSL setup ok\n", pid);
260
261 /*
262 * 5. Handshake
263 */
264 mbedtls_printf("pid %d: Performing the SSL/TLS handshake.\n", pid);
265 fflush(stdout);
266
267 while ((ret = mbedtls_ssl_handshake(&ssl)) != 0) {
268 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
269 mbedtls_printf(
270 "pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
271 pid, ret);
272 goto exit;
273 }
274 }
275
276 mbedtls_printf("pid %d: SSL handshake ok\n", pid);
277 fflush(stdout);
278
279 /*
280 * 6. Read the HTTP Request
281 */
282 mbedtls_printf("pid %d: Start reading from client.\n", pid);
283 fflush(stdout);
284
285 do {
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
294 if (ret <= 0) {
295 switch (ret) {
296 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
297 mbedtls_printf("pid %d: connection was closed gracefully\n", pid);
298 break;
299
300 case MBEDTLS_ERR_NET_CONN_RESET:
301 mbedtls_printf("pid %d: connection was reset by peer\n", pid);
302 break;
303
304 default:
305 mbedtls_printf("pid %d: mbedtls_ssl_read returned %d\n", pid, ret);
306 break;
307 }
308 fflush(stdout);
309
310 break;
311 }
312
313 len = ret;
314 mbedtls_printf("pid %d: %d bytes read\n\n%s", pid, len, (char *) buf);
315 fflush(stdout);
316
317 if (ret > 0) {
318 break;
319 }
320 } while (1);
321
322 /*
323 * 7. Write the 200 Response
324 */
325 mbedtls_printf("pid %d: Start writing to client.\n", pid);
326 fflush(stdout);
327
328 len = sprintf((char *) buf, HTTP_RESPONSE,
329 mbedtls_ssl_get_ciphersuite(&ssl));
330
331 while (cnt++ < 10) {
332 while ((ret = mbedtls_ssl_write(&ssl, buf, len)) <= 0) {
333 if (ret == MBEDTLS_ERR_NET_CONN_RESET) {
334 mbedtls_printf(
335 "pid %d: Write failed! peer closed the connection\n\n", pid);
336 goto exit;
337 }
338
339 if (ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE) {
340 mbedtls_printf(
341 "pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
342 pid, ret);
343 goto exit;
344 }
345 }
346 len = ret;
347 mbedtls_printf("pid %d: %d bytes written (cnt=%d)\n\n%s\n",
348 pid, len, cnt, (char *) buf);
349 fflush(stdout);
350
351 mbedtls_net_usleep(1000000);
352 }
353
354 mbedtls_ssl_close_notify(&ssl);
355 mbedtls_printf("pid %d: shutting down\n", pid);
356 fflush(stdout);
357 goto exit;
358 }
359
360 exit:
361 mbedtls_net_free(&client_fd);
362 mbedtls_net_free(&listen_fd);
363 mbedtls_x509_crt_free(&srvcert);
364 mbedtls_pk_free(&pkey);
365 mbedtls_ssl_free(&ssl);
366 mbedtls_ssl_config_free(&conf);
367 mbedtls_ctr_drbg_free(&ctr_drbg);
368 mbedtls_entropy_free(&entropy);
369 mbedtls_psa_crypto_free();
370
371 mbedtls_exit(exit_code);
372 }
373 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
374 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
375 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
376 ! _WIN32 */
377