1 /*
2 * SSL server demonstration program using fork() for handling multiple clients
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 #if !defined(MBEDTLS_CONFIG_FILE)
23 #include "mbedtls/config.h"
24 #else
25 #include MBEDTLS_CONFIG_FILE
26 #endif
27
28 #if defined(MBEDTLS_PLATFORM_C)
29 #include "mbedtls/platform.h"
30 #else
31 #include <stdio.h>
32 #define mbedtls_fprintf fprintf
33 #define mbedtls_printf printf
34 #define mbedtls_time_t time_t
35 #endif
36
37 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) || \
38 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
39 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
40 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
41 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
42 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C)
main(int argc,char * argv[])43 int main( int argc, char *argv[] )
44 {
45 ((void) argc);
46 ((void) argv);
47
48 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
49 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
50 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
51 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
52 "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
53 return( 0 );
54 }
55 #elif defined(_WIN32)
main(void)56 int main( void )
57 {
58 mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
59 "to work correctly.\n");
60 return( 0 );
61 }
62 #else
63
64 #include "mbedtls/entropy.h"
65 #include "mbedtls/ctr_drbg.h"
66 #include "mbedtls/certs.h"
67 #include "mbedtls/x509.h"
68 #include "mbedtls/ssl.h"
69 #include "mbedtls/net_sockets.h"
70 #include "mbedtls/timing.h"
71
72 #include <string.h>
73 #include <signal.h>
74
75 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
76 #include <unistd.h>
77 #endif
78
79 #define HTTP_RESPONSE \
80 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
81 "<h2>mbed TLS Test Server</h2>\r\n" \
82 "<p>Successful connection using: %s</p>\r\n"
83
84 #define DEBUG_LEVEL 0
85
my_debug(void * ctx,int level,const char * file,int line,const char * str)86 static void my_debug( void *ctx, int level,
87 const char *file, int line,
88 const char *str )
89 {
90 ((void) level);
91
92 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
93 fflush( (FILE *) ctx );
94 }
95
main(void)96 int main( void )
97 {
98 int ret, len, cnt = 0, pid;
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 if( ret != 0 )
167 {
168 mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
169 goto exit;
170 }
171
172 mbedtls_printf( " ok\n" );
173
174 /*
175 * 1b. Prepare SSL configuration
176 */
177 mbedtls_printf( " . Configuring SSL..." );
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 {
185 mbedtls_printf( " failed! mbedtls_ssl_config_defaults returned %d\n\n", ret );
186 goto exit;
187 }
188
189 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
190 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
191
192 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
193 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
194 {
195 mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
196 goto exit;
197 }
198
199 mbedtls_printf( " ok\n" );
200
201 /*
202 * 2. Setup the listening TCP socket
203 */
204 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
205 fflush( stdout );
206
207 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
208 {
209 mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
210 goto exit;
211 }
212
213 mbedtls_printf( " ok\n" );
214
215 while( 1 )
216 {
217 /*
218 * 3. Wait until a client connects
219 */
220 mbedtls_net_init( &client_fd );
221 mbedtls_ssl_init( &ssl );
222
223 mbedtls_printf( " . Waiting for a remote connection ...\n" );
224 fflush( stdout );
225
226 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
227 NULL, 0, NULL ) ) != 0 )
228 {
229 mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
230 goto exit;
231 }
232
233 /*
234 * 3.5. Forking server thread
235 */
236
237 mbedtls_printf( " . Forking to handle connection ..." );
238 fflush( stdout );
239
240 pid = fork();
241
242 if( pid < 0 )
243 {
244 mbedtls_printf(" failed! fork returned %d\n\n", pid );
245 goto exit;
246 }
247
248 if( pid != 0 )
249 {
250 mbedtls_printf( " ok\n" );
251
252 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
253 (const unsigned char *) "parent",
254 6 ) ) != 0 )
255 {
256 mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
257 goto exit;
258 }
259
260 continue;
261 }
262
263 mbedtls_net_init( &listen_fd );
264
265 pid = getpid();
266
267 /*
268 * 4. Setup stuff
269 */
270 mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
271 fflush( stdout );
272
273 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
274 (const unsigned char *) "child",
275 5 ) ) != 0 )
276 {
277 mbedtls_printf(
278 "pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
279 pid, ret );
280 goto exit;
281 }
282
283 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
284 {
285 mbedtls_printf(
286 "pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
287 pid, ret );
288 goto exit;
289 }
290
291 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
292
293 mbedtls_printf( "pid %d: SSL setup ok\n", pid );
294
295 /*
296 * 5. Handshake
297 */
298 mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
299 fflush( stdout );
300
301 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
302 {
303 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
304 {
305 mbedtls_printf(
306 "pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
307 pid, ret );
308 goto exit;
309 }
310 }
311
312 mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
313
314 /*
315 * 6. Read the HTTP Request
316 */
317 mbedtls_printf( "pid %d: Start reading from client.\n", pid );
318 fflush( stdout );
319
320 do
321 {
322 len = sizeof( buf ) - 1;
323 memset( buf, 0, sizeof( buf ) );
324 ret = mbedtls_ssl_read( &ssl, buf, len );
325
326 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
327 continue;
328
329 if( ret <= 0 )
330 {
331 switch( ret )
332 {
333 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
334 mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
335 break;
336
337 case MBEDTLS_ERR_NET_CONN_RESET:
338 mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
339 break;
340
341 default:
342 mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
343 break;
344 }
345
346 break;
347 }
348
349 len = ret;
350 mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
351
352 if( ret > 0 )
353 break;
354 }
355 while( 1 );
356
357 /*
358 * 7. Write the 200 Response
359 */
360 mbedtls_printf( "pid %d: Start writing to client.\n", pid );
361 fflush( stdout );
362
363 len = sprintf( (char *) buf, HTTP_RESPONSE,
364 mbedtls_ssl_get_ciphersuite( &ssl ) );
365
366 while( cnt++ < 100 )
367 {
368 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
369 {
370 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
371 {
372 mbedtls_printf(
373 "pid %d: Write failed! peer closed the connection\n\n", pid );
374 goto exit;
375 }
376
377 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
378 {
379 mbedtls_printf(
380 "pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
381 pid, ret );
382 goto exit;
383 }
384 }
385 len = ret;
386 mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
387
388 mbedtls_net_usleep( 1000000 );
389 }
390
391 mbedtls_ssl_close_notify( &ssl );
392 goto exit;
393 }
394
395 exit:
396 mbedtls_net_free( &client_fd );
397 mbedtls_net_free( &listen_fd );
398
399 mbedtls_x509_crt_free( &srvcert );
400 mbedtls_pk_free( &pkey );
401 mbedtls_ssl_free( &ssl );
402 mbedtls_ssl_config_free( &conf );
403 mbedtls_ctr_drbg_free( &ctr_drbg );
404 mbedtls_entropy_free( &entropy );
405
406 #if defined(_WIN32)
407 mbedtls_printf( " Press Enter to exit this program.\n" );
408 fflush( stdout ); getchar();
409 #endif
410
411 return( ret );
412 }
413 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
414 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
415 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
416 ! _WIN32 */
417
