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
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_fprintf fprintf
28 #define mbedtls_printf printf
29 #define mbedtls_time_t time_t
30 #define mbedtls_exit exit
31 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
32 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
33 #endif /* MBEDTLS_PLATFORM_C */
34
35 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
36 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_SRV_C) || \
37 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
38 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
39 !defined(MBEDTLS_TIMING_C) || !defined(MBEDTLS_FS_IO) || \
40 !defined(MBEDTLS_PEM_PARSE_C)
main(int argc,char * argv[])41 int main( int argc, char *argv[] )
42 {
43 ((void) argc);
44 ((void) argv);
45
46 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C "
47 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
48 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
49 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
50 "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
51 mbedtls_exit( 0 );
52 }
53 #elif defined(_WIN32)
main(void)54 int main( void )
55 {
56 mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
57 "to work correctly.\n");
58 mbedtls_exit( 0 );
59 }
60 #else
61
62 #include "mbedtls/entropy.h"
63 #include "mbedtls/ctr_drbg.h"
64 #include "test/certs.h"
65 #include "mbedtls/x509.h"
66 #include "mbedtls/ssl.h"
67 #include "mbedtls/net_sockets.h"
68 #include "mbedtls/timing.h"
69
70 #include <string.h>
71 #include <signal.h>
72
73 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
74 #include <unistd.h>
75 #endif
76
77 #define HTTP_RESPONSE \
78 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
79 "<h2>mbed TLS Test Server</h2>\r\n" \
80 "<p>Successful connection using: %s</p>\r\n"
81
82 #define DEBUG_LEVEL 0
83
84
my_debug(void * ctx,int level,const char * file,int line,const char * str)85 static void my_debug( void *ctx, int level,
86 const char *file, int line,
87 const char *str )
88 {
89 ((void) level);
90
91 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
92 fflush( (FILE *) ctx );
93 }
94
main(void)95 int main( void )
96 {
97 int ret = 1, len, cnt = 0, pid;
98 int exit_code = MBEDTLS_EXIT_FAILURE;
99 mbedtls_net_context listen_fd, client_fd;
100 unsigned char buf[1024];
101 const char *pers = "ssl_fork_server";
102
103 mbedtls_entropy_context entropy;
104 mbedtls_ctr_drbg_context ctr_drbg;
105 mbedtls_ssl_context ssl;
106 mbedtls_ssl_config conf;
107 mbedtls_x509_crt srvcert;
108 mbedtls_pk_context pkey;
109
110 mbedtls_net_init( &listen_fd );
111 mbedtls_net_init( &client_fd );
112 mbedtls_ssl_init( &ssl );
113 mbedtls_ssl_config_init( &conf );
114 mbedtls_entropy_init( &entropy );
115 mbedtls_pk_init( &pkey );
116 mbedtls_x509_crt_init( &srvcert );
117 mbedtls_ctr_drbg_init( &ctr_drbg );
118
119 signal( SIGCHLD, SIG_IGN );
120
121 /*
122 * 0. Initial seeding of the RNG
123 */
124 mbedtls_printf( "\n . Initial seeding of the random generator..." );
125 fflush( stdout );
126
127 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
128 (const unsigned char *) pers,
129 strlen( pers ) ) ) != 0 )
130 {
131 mbedtls_printf( " failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret );
132 goto exit;
133 }
134
135 mbedtls_printf( " ok\n" );
136
137 /*
138 * 1. Load the certificates and private RSA key
139 */
140 mbedtls_printf( " . Loading the server cert. and key..." );
141 fflush( stdout );
142
143 /*
144 * This demonstration program uses embedded test certificates.
145 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
146 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
147 */
148 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
149 mbedtls_test_srv_crt_len );
150 if( ret != 0 )
151 {
152 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
153 goto exit;
154 }
155
156 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
157 mbedtls_test_cas_pem_len );
158 if( ret != 0 )
159 {
160 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
161 goto exit;
162 }
163
164 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
165 mbedtls_test_srv_key_len, NULL, 0,
166 mbedtls_ctr_drbg_random, &ctr_drbg );
167 if( ret != 0 )
168 {
169 mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
170 goto exit;
171 }
172
173 mbedtls_printf( " ok\n" );
174
175 /*
176 * 1b. Prepare SSL configuration
177 */
178 mbedtls_printf( " . Configuring SSL..." );
179 fflush( stdout );
180
181 if( ( ret = mbedtls_ssl_config_defaults( &conf,
182 MBEDTLS_SSL_IS_SERVER,
183 MBEDTLS_SSL_TRANSPORT_STREAM,
184 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
185 {
186 mbedtls_printf( " failed! mbedtls_ssl_config_defaults returned %d\n\n", ret );
187 goto exit;
188 }
189
190 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
191 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
192
193 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
194 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
195 {
196 mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
197 goto exit;
198 }
199
200 mbedtls_printf( " ok\n" );
201
202 /*
203 * 2. Setup the listening TCP socket
204 */
205 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
206 fflush( stdout );
207
208 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
209 {
210 mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
211 goto exit;
212 }
213
214 mbedtls_printf( " ok\n" );
215
216 while( 1 )
217 {
218 /*
219 * 3. Wait until a client connects
220 */
221 mbedtls_net_init( &client_fd );
222 mbedtls_ssl_init( &ssl );
223
224 mbedtls_printf( " . Waiting for a remote connection ...\n" );
225 fflush( stdout );
226
227 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
228 NULL, 0, NULL ) ) != 0 )
229 {
230 mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
231 goto exit;
232 }
233
234 /*
235 * 3.5. Forking server thread
236 */
237
238 mbedtls_printf( " . Forking to handle connection ..." );
239 fflush( stdout );
240
241 pid = fork();
242
243 if( pid < 0 )
244 {
245 mbedtls_printf(" failed! fork returned %d\n\n", pid );
246 goto exit;
247 }
248
249 if( pid != 0 )
250 {
251 mbedtls_printf( " ok\n" );
252 mbedtls_net_close( &client_fd );
253
254 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
255 (const unsigned char *) "parent",
256 6 ) ) != 0 )
257 {
258 mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
259 goto exit;
260 }
261
262 continue;
263 }
264
265 mbedtls_net_close( &listen_fd );
266
267 pid = getpid();
268
269 /*
270 * 4. Setup stuff
271 */
272 mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
273 fflush( stdout );
274
275 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
276 (const unsigned char *) "child",
277 5 ) ) != 0 )
278 {
279 mbedtls_printf(
280 "pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
281 pid, ret );
282 goto exit;
283 }
284
285 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
286 {
287 mbedtls_printf(
288 "pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
289 pid, ret );
290 goto exit;
291 }
292
293 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
294
295 mbedtls_printf( "pid %d: SSL setup ok\n", pid );
296
297 /*
298 * 5. Handshake
299 */
300 mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
301 fflush( stdout );
302
303 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
304 {
305 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
306 {
307 mbedtls_printf(
308 "pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
309 pid, ret );
310 goto exit;
311 }
312 }
313
314 mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
315
316 /*
317 * 6. Read the HTTP Request
318 */
319 mbedtls_printf( "pid %d: Start reading from client.\n", pid );
320 fflush( stdout );
321
322 do
323 {
324 len = sizeof( buf ) - 1;
325 memset( buf, 0, sizeof( buf ) );
326 ret = mbedtls_ssl_read( &ssl, buf, len );
327
328 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
329 continue;
330
331 if( ret <= 0 )
332 {
333 switch( ret )
334 {
335 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
336 mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
337 break;
338
339 case MBEDTLS_ERR_NET_CONN_RESET:
340 mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
341 break;
342
343 default:
344 mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
345 break;
346 }
347
348 break;
349 }
350
351 len = ret;
352 mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
353
354 if( ret > 0 )
355 break;
356 }
357 while( 1 );
358
359 /*
360 * 7. Write the 200 Response
361 */
362 mbedtls_printf( "pid %d: Start writing to client.\n", pid );
363 fflush( stdout );
364
365 len = sprintf( (char *) buf, HTTP_RESPONSE,
366 mbedtls_ssl_get_ciphersuite( &ssl ) );
367
368 while( cnt++ < 100 )
369 {
370 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
371 {
372 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
373 {
374 mbedtls_printf(
375 "pid %d: Write failed! peer closed the connection\n\n", pid );
376 goto exit;
377 }
378
379 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
380 {
381 mbedtls_printf(
382 "pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
383 pid, ret );
384 goto exit;
385 }
386 }
387 len = ret;
388 mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
389
390 mbedtls_net_usleep( 1000000 );
391 }
392
393 mbedtls_ssl_close_notify( &ssl );
394 goto exit;
395 }
396
397 exit_code = MBEDTLS_EXIT_SUCCESS;
398
399 exit:
400 mbedtls_net_free( &client_fd );
401 mbedtls_net_free( &listen_fd );
402
403 mbedtls_x509_crt_free( &srvcert );
404 mbedtls_pk_free( &pkey );
405 mbedtls_ssl_free( &ssl );
406 mbedtls_ssl_config_free( &conf );
407 mbedtls_ctr_drbg_free( &ctr_drbg );
408 mbedtls_entropy_free( &entropy );
409
410 #if defined(_WIN32)
411 mbedtls_printf( " Press Enter to exit this program.\n" );
412 fflush( stdout ); getchar();
413 #endif
414
415 mbedtls_exit( exit_code );
416 }
417 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C &&
418 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
419 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
420 ! _WIN32 */
421