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 #include <stdlib.h>
33 #define mbedtls_fprintf fprintf
34 #define mbedtls_printf printf
35 #define mbedtls_time_t time_t
36 #define mbedtls_exit exit
37 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
38 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
39 #endif /* MBEDTLS_PLATFORM_C */
40
41 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_CERTS_C) || \
42 !defined(MBEDTLS_ENTROPY_C) || !defined(MBEDTLS_SSL_TLS_C) || \
43 !defined(MBEDTLS_SSL_SRV_C) || !defined(MBEDTLS_NET_C) || \
44 !defined(MBEDTLS_RSA_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
45 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_TIMING_C) || \
46 !defined(MBEDTLS_FS_IO) || !defined(MBEDTLS_PEM_PARSE_C)
main(int argc,char * argv[])47 int main( int argc, char *argv[] )
48 {
49 ((void) argc);
50 ((void) argv);
51
52 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_CERTS_C and/or MBEDTLS_ENTROPY_C "
53 "and/or MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_SRV_C and/or "
54 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
55 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C and/or "
56 "MBEDTLS_TIMING_C and/or MBEDTLS_PEM_PARSE_C not defined.\n");
57 return( 0 );
58 }
59 #elif defined(_WIN32)
main(void)60 int main( void )
61 {
62 mbedtls_printf("_WIN32 defined. This application requires fork() and signals "
63 "to work correctly.\n");
64 return( 0 );
65 }
66 #else
67
68 #include "mbedtls/entropy.h"
69 #include "mbedtls/ctr_drbg.h"
70 #include "mbedtls/certs.h"
71 #include "mbedtls/x509.h"
72 #include "mbedtls/ssl.h"
73 #include "mbedtls/net_sockets.h"
74 #include "mbedtls/timing.h"
75
76 #include <string.h>
77 #include <signal.h>
78
79 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
80 #include <unistd.h>
81 #endif
82
83 #define HTTP_RESPONSE \
84 "HTTP/1.0 200 OK\r\nContent-Type: text/html\r\n\r\n" \
85 "<h2>mbed TLS Test Server</h2>\r\n" \
86 "<p>Successful connection using: %s</p>\r\n"
87
88 #define DEBUG_LEVEL 0
89
90 #if defined(MBEDTLS_CHECK_PARAMS)
91 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)92 void mbedtls_param_failed( const char *failure_condition,
93 const char *file,
94 int line )
95 {
96 mbedtls_printf( "%s:%i: Input param failed - %s\n",
97 file, line, failure_condition );
98 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
99 }
100 #endif
101
my_debug(void * ctx,int level,const char * file,int line,const char * str)102 static void my_debug( void *ctx, int level,
103 const char *file, int line,
104 const char *str )
105 {
106 ((void) level);
107
108 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
109 fflush( (FILE *) ctx );
110 }
111
main(void)112 int main( void )
113 {
114 int ret = 1, len, cnt = 0, pid;
115 int exit_code = MBEDTLS_EXIT_FAILURE;
116 mbedtls_net_context listen_fd, client_fd;
117 unsigned char buf[1024];
118 const char *pers = "ssl_fork_server";
119
120 mbedtls_entropy_context entropy;
121 mbedtls_ctr_drbg_context ctr_drbg;
122 mbedtls_ssl_context ssl;
123 mbedtls_ssl_config conf;
124 mbedtls_x509_crt srvcert;
125 mbedtls_pk_context pkey;
126
127 mbedtls_net_init( &listen_fd );
128 mbedtls_net_init( &client_fd );
129 mbedtls_ssl_init( &ssl );
130 mbedtls_ssl_config_init( &conf );
131 mbedtls_entropy_init( &entropy );
132 mbedtls_pk_init( &pkey );
133 mbedtls_x509_crt_init( &srvcert );
134 mbedtls_ctr_drbg_init( &ctr_drbg );
135
136 signal( SIGCHLD, SIG_IGN );
137
138 /*
139 * 0. Initial seeding of the RNG
140 */
141 mbedtls_printf( "\n . Initial seeding of the random generator..." );
142 fflush( stdout );
143
144 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
145 (const unsigned char *) pers,
146 strlen( pers ) ) ) != 0 )
147 {
148 mbedtls_printf( " failed! mbedtls_ctr_drbg_seed returned %d\n\n", ret );
149 goto exit;
150 }
151
152 mbedtls_printf( " ok\n" );
153
154 /*
155 * 1. Load the certificates and private RSA key
156 */
157 mbedtls_printf( " . Loading the server cert. and key..." );
158 fflush( stdout );
159
160 /*
161 * This demonstration program uses embedded test certificates.
162 * Instead, you may want to use mbedtls_x509_crt_parse_file() to read the
163 * server and CA certificates, as well as mbedtls_pk_parse_keyfile().
164 */
165 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_srv_crt,
166 mbedtls_test_srv_crt_len );
167 if( ret != 0 )
168 {
169 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
170 goto exit;
171 }
172
173 ret = mbedtls_x509_crt_parse( &srvcert, (const unsigned char *) mbedtls_test_cas_pem,
174 mbedtls_test_cas_pem_len );
175 if( ret != 0 )
176 {
177 mbedtls_printf( " failed! mbedtls_x509_crt_parse returned %d\n\n", ret );
178 goto exit;
179 }
180
181 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_srv_key,
182 mbedtls_test_srv_key_len, NULL, 0 );
183 if( ret != 0 )
184 {
185 mbedtls_printf( " failed! mbedtls_pk_parse_key returned %d\n\n", ret );
186 goto exit;
187 }
188
189 mbedtls_printf( " ok\n" );
190
191 /*
192 * 1b. Prepare SSL configuration
193 */
194 mbedtls_printf( " . Configuring SSL..." );
195 fflush( stdout );
196
197 if( ( ret = mbedtls_ssl_config_defaults( &conf,
198 MBEDTLS_SSL_IS_SERVER,
199 MBEDTLS_SSL_TRANSPORT_STREAM,
200 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
201 {
202 mbedtls_printf( " failed! mbedtls_ssl_config_defaults returned %d\n\n", ret );
203 goto exit;
204 }
205
206 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
207 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
208
209 mbedtls_ssl_conf_ca_chain( &conf, srvcert.next, NULL );
210 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &srvcert, &pkey ) ) != 0 )
211 {
212 mbedtls_printf( " failed! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
213 goto exit;
214 }
215
216 mbedtls_printf( " ok\n" );
217
218 /*
219 * 2. Setup the listening TCP socket
220 */
221 mbedtls_printf( " . Bind on https://localhost:4433/ ..." );
222 fflush( stdout );
223
224 if( ( ret = mbedtls_net_bind( &listen_fd, NULL, "4433", MBEDTLS_NET_PROTO_TCP ) ) != 0 )
225 {
226 mbedtls_printf( " failed! mbedtls_net_bind returned %d\n\n", ret );
227 goto exit;
228 }
229
230 mbedtls_printf( " ok\n" );
231
232 while( 1 )
233 {
234 /*
235 * 3. Wait until a client connects
236 */
237 mbedtls_net_init( &client_fd );
238 mbedtls_ssl_init( &ssl );
239
240 mbedtls_printf( " . Waiting for a remote connection ...\n" );
241 fflush( stdout );
242
243 if( ( ret = mbedtls_net_accept( &listen_fd, &client_fd,
244 NULL, 0, NULL ) ) != 0 )
245 {
246 mbedtls_printf( " failed! mbedtls_net_accept returned %d\n\n", ret );
247 goto exit;
248 }
249
250 /*
251 * 3.5. Forking server thread
252 */
253
254 mbedtls_printf( " . Forking to handle connection ..." );
255 fflush( stdout );
256
257 pid = fork();
258
259 if( pid < 0 )
260 {
261 mbedtls_printf(" failed! fork returned %d\n\n", pid );
262 goto exit;
263 }
264
265 if( pid != 0 )
266 {
267 mbedtls_printf( " ok\n" );
268
269 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
270 (const unsigned char *) "parent",
271 6 ) ) != 0 )
272 {
273 mbedtls_printf( " failed! mbedtls_ctr_drbg_reseed returned %d\n\n", ret );
274 goto exit;
275 }
276
277 continue;
278 }
279
280 mbedtls_net_init( &listen_fd );
281
282 pid = getpid();
283
284 /*
285 * 4. Setup stuff
286 */
287 mbedtls_printf( "pid %d: Setting up the SSL data.\n", pid );
288 fflush( stdout );
289
290 if( ( ret = mbedtls_ctr_drbg_reseed( &ctr_drbg,
291 (const unsigned char *) "child",
292 5 ) ) != 0 )
293 {
294 mbedtls_printf(
295 "pid %d: SSL setup failed! mbedtls_ctr_drbg_reseed returned %d\n\n",
296 pid, ret );
297 goto exit;
298 }
299
300 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
301 {
302 mbedtls_printf(
303 "pid %d: SSL setup failed! mbedtls_ssl_setup returned %d\n\n",
304 pid, ret );
305 goto exit;
306 }
307
308 mbedtls_ssl_set_bio( &ssl, &client_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
309
310 mbedtls_printf( "pid %d: SSL setup ok\n", pid );
311
312 /*
313 * 5. Handshake
314 */
315 mbedtls_printf( "pid %d: Performing the SSL/TLS handshake.\n", pid );
316 fflush( stdout );
317
318 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
319 {
320 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
321 {
322 mbedtls_printf(
323 "pid %d: SSL handshake failed! mbedtls_ssl_handshake returned %d\n\n",
324 pid, ret );
325 goto exit;
326 }
327 }
328
329 mbedtls_printf( "pid %d: SSL handshake ok\n", pid );
330
331 /*
332 * 6. Read the HTTP Request
333 */
334 mbedtls_printf( "pid %d: Start reading from client.\n", pid );
335 fflush( stdout );
336
337 do
338 {
339 len = sizeof( buf ) - 1;
340 memset( buf, 0, sizeof( buf ) );
341 ret = mbedtls_ssl_read( &ssl, buf, len );
342
343 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
344 continue;
345
346 if( ret <= 0 )
347 {
348 switch( ret )
349 {
350 case MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY:
351 mbedtls_printf( "pid %d: connection was closed gracefully\n", pid );
352 break;
353
354 case MBEDTLS_ERR_NET_CONN_RESET:
355 mbedtls_printf( "pid %d: connection was reset by peer\n", pid );
356 break;
357
358 default:
359 mbedtls_printf( "pid %d: mbedtls_ssl_read returned %d\n", pid, ret );
360 break;
361 }
362
363 break;
364 }
365
366 len = ret;
367 mbedtls_printf( "pid %d: %d bytes read\n\n%s", pid, len, (char *) buf );
368
369 if( ret > 0 )
370 break;
371 }
372 while( 1 );
373
374 /*
375 * 7. Write the 200 Response
376 */
377 mbedtls_printf( "pid %d: Start writing to client.\n", pid );
378 fflush( stdout );
379
380 len = sprintf( (char *) buf, HTTP_RESPONSE,
381 mbedtls_ssl_get_ciphersuite( &ssl ) );
382
383 while( cnt++ < 100 )
384 {
385 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
386 {
387 if( ret == MBEDTLS_ERR_NET_CONN_RESET )
388 {
389 mbedtls_printf(
390 "pid %d: Write failed! peer closed the connection\n\n", pid );
391 goto exit;
392 }
393
394 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
395 {
396 mbedtls_printf(
397 "pid %d: Write failed! mbedtls_ssl_write returned %d\n\n",
398 pid, ret );
399 goto exit;
400 }
401 }
402 len = ret;
403 mbedtls_printf( "pid %d: %d bytes written\n\n%s\n", pid, len, (char *) buf );
404
405 mbedtls_net_usleep( 1000000 );
406 }
407
408 mbedtls_ssl_close_notify( &ssl );
409 goto exit;
410 }
411
412 exit_code = MBEDTLS_EXIT_SUCCESS;
413
414 exit:
415 mbedtls_net_free( &client_fd );
416 mbedtls_net_free( &listen_fd );
417
418 mbedtls_x509_crt_free( &srvcert );
419 mbedtls_pk_free( &pkey );
420 mbedtls_ssl_free( &ssl );
421 mbedtls_ssl_config_free( &conf );
422 mbedtls_ctr_drbg_free( &ctr_drbg );
423 mbedtls_entropy_free( &entropy );
424
425 #if defined(_WIN32)
426 mbedtls_printf( " Press Enter to exit this program.\n" );
427 fflush( stdout ); getchar();
428 #endif
429
430 return( exit_code );
431 }
432 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_CERTS_C && MBEDTLS_ENTROPY_C &&
433 MBEDTLS_SSL_TLS_C && MBEDTLS_SSL_SRV_C && MBEDTLS_NET_C &&
434 MBEDTLS_RSA_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_PEM_PARSE_C &&
435 ! _WIN32 */
436