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 #if !defined(MBEDTLS_CONFIG_FILE)
21 #include "mbedtls/config.h"
22 #else
23 #include MBEDTLS_CONFIG_FILE
24 #endif
25
26 #if defined(MBEDTLS_PLATFORM_C)
27 #include "mbedtls/platform.h"
28 #else
29 #include <stdio.h>
30 #include <stdlib.h>
31 #define mbedtls_fprintf fprintf
32 #define mbedtls_printf printf
33 #define mbedtls_time_t time_t
34 #define mbedtls_exit exit
35 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
36 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
37 #endif /* MBEDTLS_PLATFORM_C */
38
39 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) || \
40 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
41 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
42 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
43 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
44 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C)
main(int argc,char * argv[])45 int main( int argc, char *argv[] )
46 {
47 ((void) argc);
48 ((void) argv);
49
50 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
51 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
52 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
53 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
54 "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
55 mbedtls_exit( 0 );
56 }
57 #elif defined(_WIN32)
main(void)58 int main( void )
59 {
60 mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
61 "to work correctly.\n");
62 mbedtls_exit( 0 );
63 }
64 #else
65
66 #include "mbedtls/entropy.h"
67 #include "mbedtls/ctr_drbg.h"
68 #include "mbedtls/certs.h"
69 #include "mbedtls/x509.h"
70 #include "mbedtls/ssl.h"
71 #include "mbedtls/net_sockets.h"
72 #include "mbedtls/timing.h"
73
74 #include <string.h>
75 #include <signal.h>
76
77 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
78 #include <unistd.h>
79 #endif
80
81 #define HTTP_RESPONSE \
82 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
83 "<h2>mbed TLS Test Server</h2>\r\n" \
84 "<p>Successful connection using: %s</p>\r\n"
85
86 #define DEBUG_LEVEL 0
87
88
my_debug(void * ctx,int level,const char * file,int line,const char * str)89 static void my_debug( void *ctx, int level,
90 const char *file, int line,
91 const char *str )
92 {
93 ((void) level);
94
95 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
96 fflush( (FILE *) ctx );
97 }
98
main(void)99 int main( void )
100 {
101 int ret = 1, len, cnt = 0, pid;
102 int exit_code = MBEDTLS_EXIT_FAILURE;
103 mbedtls_net_context listen_fd, client_fd;
104 unsigned char buf[1024];
105 const char *pers = "ssl_fork_server";
106
107 mbedtls_entropy_context entropy;
108 mbedtls_ctr_drbg_context ctr_drbg;
109 mbedtls_ssl_context ssl;
110 mbedtls_ssl_config conf;
111 mbedtls_x509_crt srvcert;
112 mbedtls_pk_context pkey;
113
114 mbedtls_net_init( &listen_fd );
115 mbedtls_net_init( &client_fd );
116 mbedtls_ssl_init( &ssl );
117 mbedtls_ssl_config_init( &conf );
118 mbedtls_entropy_init( &entropy );
119 mbedtls_pk_init( &pkey );
120 mbedtls_x509_crt_init( &srvcert );
121 mbedtls_ctr_drbg_init( &ctr_drbg );
122
123 signal( SIGCHLD, SIG_IGN );
124
125 /*
126 * 0. Initial seeding of the RNG
127 */
128 mbedtls_printf( "\n . Initial seeding of the random generator..." );
129 fflush( stdout );
130
131 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
132 (const unsigned char *) pers,
133 strlen( pers ) ) ) != 0 )
134 {
135 mbedtls_printf( " failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret );
136 goto exit;
137 }
138
139 mbedtls_printf( " ok\n" );
140
141 /*
142 * 1. Load the certificates and private RSA key
143 */
144 mbedtls_printf( " . Loading the server cert. and key..." );
145 fflush( stdout );
146
147 /*
148 * This demonstration program uses embedded test certificates.
149 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
150 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
151 */
152 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
153 mbedtls_test_srv_crt_len );
154 if( ret != 0 )
155 {
156 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
157 goto exit;
158 }
159
160 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
161 mbedtls_test_cas_pem_len );
162 if( ret != 0 )
163 {
164 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
165 goto exit;
166 }
167
168 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
169 mbedtls_test_srv_key_len, NULL, 0 );
170 if( ret != 0 )
171 {
172 mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
173 goto exit;
174 }
175
176 mbedtls_printf( " ok\n" );
177
178 /*
179 * 1b. Prepare SSL configuration
180 */
181 mbedtls_printf( " . Configuring SSL..." );
182 fflush( stdout );
183
184 if( ( ret = mbedtls_ssl_config_defaults( &conf,
185 MBEDTLS_SSL_IS_SERVER,
186 MBEDTLS_SSL_TRANSPORT_STREAM,
187 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
188 {
189 mbedtls_printf( " failed! mbedtls_ssl_config_defaults returned %d\n\n", ret );
190 goto exit;
191 }
192
193 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
194 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
195
196 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
197 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
198 {
199 mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
200 goto exit;
201 }
202
203 mbedtls_printf( " ok\n" );
204
205 /*
206 * 2. Setup the listening TCP socket
207 */
208 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
209 fflush( stdout );
210
211 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
212 {
213 mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
214 goto exit;
215 }
216
217 mbedtls_printf( " ok\n" );
218
219 while( 1 )
220 {
221 /*
222 * 3. Wait until a client connects
223 */
224 mbedtls_net_init( &client_fd );
225 mbedtls_ssl_init( &ssl );
226
227 mbedtls_printf( " . Waiting for a remote connection ...\n" );
228 fflush( stdout );
229
230 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
231 NULL, 0, NULL ) ) != 0 )
232 {
233 mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
234 goto exit;
235 }
236
237 /*
238 * 3.5. Forking server thread
239 */
240
241 mbedtls_printf( " . Forking to handle connection ..." );
242 fflush( stdout );
243
244 pid = fork();
245
246 if( pid < 0 )
247 {
248 mbedtls_printf(" failed! fork returned %d\n\n", pid );
249 goto exit;
250 }
251
252 if( pid != 0 )
253 {
254 mbedtls_printf( " ok\n" );
255 mbedtls_net_close( &client_fd );
256
257 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
258 (const unsigned char *) "parent",
259 6 ) ) != 0 )
260 {
261 mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
262 goto exit;
263 }
264
265 continue;
266 }
267
268 mbedtls_net_close( &listen_fd );
269
270 pid = getpid();
271
272 /*
273 * 4. Setup stuff
274 */
275 mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
276 fflush( stdout );
277
278 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
279 (const unsigned char *) "child",
280 5 ) ) != 0 )
281 {
282 mbedtls_printf(
283 "pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
284 pid, ret );
285 goto exit;
286 }
287
288 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
289 {
290 mbedtls_printf(
291 "pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
292 pid, ret );
293 goto exit;
294 }
295
296 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
297
298 mbedtls_printf( "pid %d: SSL setup ok\n", pid );
299
300 /*
301 * 5. Handshake
302 */
303 mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
304 fflush( stdout );
305
306 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
307 {
308 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
309 {
310 mbedtls_printf(
311 "pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
312 pid, ret );
313 goto exit;
314 }
315 }
316
317 mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
318
319 /*
320 * 6. Read the HTTP Request
321 */
322 mbedtls_printf( "pid %d: Start reading from client.\n", pid );
323 fflush( stdout );
324
325 do
326 {
327 len = sizeof( buf ) - 1;
328 memset( buf, 0, sizeof( buf ) );
329 ret = mbedtls_ssl_read( &ssl, buf, len );
330
331 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
332 continue;
333
334 if( ret <= 0 )
335 {
336 switch( ret )
337 {
338 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
339 mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
340 break;
341
342 case MBEDTLS_ERR_NET_CONN_RESET:
343 mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
344 break;
345
346 default:
347 mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
348 break;
349 }
350
351 break;
352 }
353
354 len = ret;
355 mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
356
357 if( ret > 0 )
358 break;
359 }
360 while( 1 );
361
362 /*
363 * 7. Write the 200 Response
364 */
365 mbedtls_printf( "pid %d: Start writing to client.\n", pid );
366 fflush( stdout );
367
368 len = sprintf( (char *) buf, HTTP_RESPONSE,
369 mbedtls_ssl_get_ciphersuite( &ssl ) );
370
371 while( cnt++ < 100 )
372 {
373 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
374 {
375 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
376 {
377 mbedtls_printf(
378 "pid %d: Write failed! peer closed the connection\n\n", pid );
379 goto exit;
380 }
381
382 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
383 {
384 mbedtls_printf(
385 "pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
386 pid, ret );
387 goto exit;
388 }
389 }
390 len = ret;
391 mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
392
393 mbedtls_net_usleep( 1000000 );
394 }
395
396 mbedtls_ssl_close_notify( &ssl );
397 goto exit;
398 }
399
400 exit_code = MBEDTLS_EXIT_SUCCESS;
401
402 exit:
403 mbedtls_net_free( &client_fd );
404 mbedtls_net_free( &listen_fd );
405
406 mbedtls_x509_crt_free( &srvcert );
407 mbedtls_pk_free( &pkey );
408 mbedtls_ssl_free( &ssl );
409 mbedtls_ssl_config_free( &conf );
410 mbedtls_ctr_drbg_free( &ctr_drbg );
411 mbedtls_entropy_free( &entropy );
412
413 #if defined(_WIN32)
414 mbedtls_printf( " Press Enter to exit this program.\n" );
415 fflush( stdout ); getchar();
416 #endif
417
418 mbedtls_exit( exit_code );
419 }
420 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
421 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
422 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
423 ! _WIN32 */
424
