1 /*
2 * SSL client demonstration program
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
6 *
7 * This file is provided under the Apache License 2.0, or the
8 * GNU General Public License v2.0 or later.
9 *
10 * **********
11 * Apache License 2.0:
12 *
13 * Licensed under the Apache License, Version 2.0 (the "License"); you may
14 * not use this file except in compliance with the License.
15 * You may obtain a copy of the License at
16 *
17 * http://www.apache.org/licenses/LICENSE-2.0
18 *
19 * Unless required by applicable law or agreed to in writing, software
20 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
21 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
22 * See the License for the specific language governing permissions and
23 * limitations under the License.
24 *
25 * **********
26 *
27 * **********
28 * GNU General Public License v2.0 or later:
29 *
30 * This program is free software; you can redistribute it and/or modify
31 * it under the terms of the GNU General Public License as published by
32 * the Free Software Foundation; either version 2 of the License, or
33 * (at your option) any later version.
34 *
35 * This program is distributed in the hope that it will be useful,
36 * but WITHOUT ANY WARRANTY; without even the implied warranty of
37 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
38 * GNU General Public License for more details.
39 *
40 * You should have received a copy of the GNU General Public License along
41 * with this program; if not, write to the Free Software Foundation, Inc.,
42 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
43 *
44 * **********
45 */
46
47 #if !defined(MBEDTLS_CONFIG_FILE)
48 #include "mbedtls/config.h"
49 #else
50 #include MBEDTLS_CONFIG_FILE
51 #endif
52
53 #if defined(MBEDTLS_PLATFORM_C)
54 #include "mbedtls/platform.h"
55 #else
56 #include <stdio.h>
57 #include <stdlib.h>
58 #define mbedtls_time time
59 #define mbedtls_time_t time_t
60 #define mbedtls_fprintf fprintf
61 #define mbedtls_printf printf
62 #define mbedtls_exit exit
63 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
64 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
65 #endif /* MBEDTLS_PLATFORM_C */
66
67 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
68 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
69 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
70 !defined(MBEDTLS_CERTS_C) || !defined(MBEDTLS_PEM_PARSE_C) || \
71 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C)
main(void)72 int main( void )
73 {
74 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
75 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
76 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
77 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
78 "not defined.\n");
79 mbedtls_exit( 0 );
80 }
81 #else
82
83 #include "mbedtls/net_sockets.h"
84 #include "mbedtls/debug.h"
85 #include "mbedtls/ssl.h"
86 #include "mbedtls/entropy.h"
87 #include "mbedtls/ctr_drbg.h"
88 #include "mbedtls/error.h"
89 #include "mbedtls/certs.h"
90
91 #include <string.h>
92
93 #define SERVER_PORT "4433"
94 #define SERVER_NAME "localhost"
95 #define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
96
97 #define DEBUG_LEVEL 1
98
99
my_debug(void * ctx,int level,const char * file,int line,const char * str)100 static void my_debug( void *ctx, int level,
101 const char *file, int line,
102 const char *str )
103 {
104 ((void) level);
105
106 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
107 fflush( (FILE *) ctx );
108 }
109
main(void)110 int main( void )
111 {
112 int ret = 1, len;
113 int exit_code = MBEDTLS_EXIT_FAILURE;
114 mbedtls_net_context server_fd;
115 uint32_t flags;
116 unsigned char buf[1024];
117 const char *pers = "ssl_client1";
118
119 mbedtls_entropy_context entropy;
120 mbedtls_ctr_drbg_context ctr_drbg;
121 mbedtls_ssl_context ssl;
122 mbedtls_ssl_config conf;
123 mbedtls_x509_crt cacert;
124
125 #if defined(MBEDTLS_DEBUG_C)
126 mbedtls_debug_set_threshold( DEBUG_LEVEL );
127 #endif
128
129 /*
130 * 0. Initialize the RNG and the session data
131 */
132 mbedtls_net_init( &server_fd );
133 mbedtls_ssl_init( &ssl );
134 mbedtls_ssl_config_init( &conf );
135 mbedtls_x509_crt_init( &cacert );
136 mbedtls_ctr_drbg_init( &ctr_drbg );
137
138 mbedtls_printf( "\n . Seeding the random number generator..." );
139 fflush( stdout );
140
141 mbedtls_entropy_init( &entropy );
142 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
143 (const unsigned char *) pers,
144 strlen( pers ) ) ) != 0 )
145 {
146 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
147 goto exit;
148 }
149
150 mbedtls_printf( " ok\n" );
151
152 /*
153 * 0. Initialize certificates
154 */
155 mbedtls_printf( " . Loading the CA root certificate ..." );
156 fflush( stdout );
157
158 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
159 mbedtls_test_cas_pem_len );
160 if( ret < 0 )
161 {
162 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned -0x%x\n\n", -ret );
163 goto exit;
164 }
165
166 mbedtls_printf( " ok (%d skipped)\n", ret );
167
168 /*
169 * 1. Start the connection
170 */
171 mbedtls_printf( " . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT );
172 fflush( stdout );
173
174 if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
175 SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
176 {
177 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
178 goto exit;
179 }
180
181 mbedtls_printf( " ok\n" );
182
183 /*
184 * 2. Setup stuff
185 */
186 mbedtls_printf( " . Setting up the SSL/TLS structure..." );
187 fflush( stdout );
188
189 if( ( ret = mbedtls_ssl_config_defaults( &conf,
190 MBEDTLS_SSL_IS_CLIENT,
191 MBEDTLS_SSL_TRANSPORT_STREAM,
192 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
193 {
194 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
195 goto exit;
196 }
197
198 mbedtls_printf( " ok\n" );
199
200 /* OPTIONAL is not optimal for security,
201 * but makes interop easier in this simplified example */
202 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
203 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
204 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
205 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
206
207 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
208 {
209 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
210 goto exit;
211 }
212
213 if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
214 {
215 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
216 goto exit;
217 }
218
219 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
220
221 /*
222 * 4. Handshake
223 */
224 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
225 fflush( stdout );
226
227 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
228 {
229 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
230 {
231 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", -ret );
232 goto exit;
233 }
234 }
235
236 mbedtls_printf( " ok\n" );
237
238 /*
239 * 5. Verify the server certificate
240 */
241 mbedtls_printf( " . Verifying peer X.509 certificate..." );
242
243 /* In real life, we probably want to bail out when ret != 0 */
244 if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
245 {
246 char vrfy_buf[512];
247
248 mbedtls_printf( " failed\n" );
249
250 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
251
252 mbedtls_printf( "%s\n", vrfy_buf );
253 }
254 else
255 mbedtls_printf( " ok\n" );
256
257 /*
258 * 3. Write the GET request
259 */
260 mbedtls_printf( " > Write to server:" );
261 fflush( stdout );
262
263 len = sprintf( (char *) buf, GET_REQUEST );
264
265 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
266 {
267 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
268 {
269 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
270 goto exit;
271 }
272 }
273
274 len = ret;
275 mbedtls_printf( " %d bytes written\n\n%s", len, (char *) buf );
276
277 /*
278 * 7. Read the HTTP response
279 */
280 mbedtls_printf( " < Read from server:" );
281 fflush( stdout );
282
283 do
284 {
285 len = sizeof( buf ) - 1;
286 memset( buf, 0, sizeof( buf ) );
287 ret = mbedtls_ssl_read( &ssl, buf, len );
288
289 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
290 continue;
291
292 if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
293 break;
294
295 if( ret < 0 )
296 {
297 mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
298 break;
299 }
300
301 if( ret == 0 )
302 {
303 mbedtls_printf( "\n\nEOF\n\n" );
304 break;
305 }
306
307 len = ret;
308 mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
309 }
310 while( 1 );
311
312 mbedtls_ssl_close_notify( &ssl );
313
314 exit_code = MBEDTLS_EXIT_SUCCESS;
315
316 exit:
317
318 #ifdef MBEDTLS_ERROR_C
319 if( exit_code != MBEDTLS_EXIT_SUCCESS )
320 {
321 char error_buf[100];
322 mbedtls_strerror( ret, error_buf, 100 );
323 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
324 }
325 #endif
326
327 mbedtls_net_free( &server_fd );
328
329 mbedtls_x509_crt_free( &cacert );
330 mbedtls_ssl_free( &ssl );
331 mbedtls_ssl_config_free( &conf );
332 mbedtls_ctr_drbg_free( &ctr_drbg );
333 mbedtls_entropy_free( &entropy );
334
335 #if defined(_WIN32)
336 mbedtls_printf( " + Press Enter to exit this program.\n" );
337 fflush( stdout ); getchar();
338 #endif
339
340 mbedtls_exit( exit_code );
341 }
342 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
343 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
344 MBEDTLS_CERTS_C && MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C &&
345 MBEDTLS_X509_CRT_PARSE_C */
346