1 /*
2 * SSL client demonstration program
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_time time
28 #define mbedtls_time_t time_t
29 #define mbedtls_fprintf fprintf
30 #define mbedtls_printf printf
31 #define mbedtls_exit exit
32 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
33 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
34 #endif /* MBEDTLS_PLATFORM_C */
35
36 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
37 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
38 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
39 !defined(MBEDTLS_PEM_PARSE_C) || !defined(MBEDTLS_CTR_DRBG_C) || \
40 !defined(MBEDTLS_X509_CRT_PARSE_C)
main(void)41 int main( void )
42 {
43 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
44 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
45 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
46 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
47 "not defined.\n");
48 mbedtls_exit( 0 );
49 }
50 #else
51
52 #include "mbedtls/net_sockets.h"
53 #include "mbedtls/debug.h"
54 #include "mbedtls/ssl.h"
55 #include "mbedtls/entropy.h"
56 #include "mbedtls/ctr_drbg.h"
57 #include "mbedtls/error.h"
58 #include "test/certs.h"
59
60 #include <string.h>
61
62 #define SERVER_PORT "4433"
63 #define SERVER_NAME "localhost"
64 #define GET_REQUEST "GET / HTTP/1.0\r\n\r\n"
65
66 #define DEBUG_LEVEL 1
67
68
my_debug(void * ctx,int level,const char * file,int line,const char * str)69 static void my_debug( void *ctx, int level,
70 const char *file, int line,
71 const char *str )
72 {
73 ((void) level);
74
75 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
76 fflush( (FILE *) ctx );
77 }
78
main(void)79 int main( void )
80 {
81 int ret = 1, len;
82 int exit_code = MBEDTLS_EXIT_FAILURE;
83 mbedtls_net_context server_fd;
84 uint32_t flags;
85 unsigned char buf[1024];
86 const char *pers = "ssl_client1";
87
88 mbedtls_entropy_context entropy;
89 mbedtls_ctr_drbg_context ctr_drbg;
90 mbedtls_ssl_context ssl;
91 mbedtls_ssl_config conf;
92 mbedtls_x509_crt cacert;
93
94 #if defined(MBEDTLS_DEBUG_C)
95 mbedtls_debug_set_threshold( DEBUG_LEVEL );
96 #endif
97
98 /*
99 * 0. Initialize the RNG and the session data
100 */
101 mbedtls_net_init( &server_fd );
102 mbedtls_ssl_init( &ssl );
103 mbedtls_ssl_config_init( &conf );
104 mbedtls_x509_crt_init( &cacert );
105 mbedtls_ctr_drbg_init( &ctr_drbg );
106
107 mbedtls_printf( "\n . Seeding the random number generator..." );
108 fflush( stdout );
109
110 mbedtls_entropy_init( &entropy );
111 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
112 (const unsigned char *) pers,
113 strlen( pers ) ) ) != 0 )
114 {
115 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
116 goto exit;
117 }
118
119 mbedtls_printf( " ok\n" );
120
121 /*
122 * 0. Initialize certificates
123 */
124 mbedtls_printf( " . Loading the CA root certificate ..." );
125 fflush( stdout );
126
127 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
128 mbedtls_test_cas_pem_len );
129 if( ret < 0 )
130 {
131 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned -0x%x\n\n", (unsigned int) -ret );
132 goto exit;
133 }
134
135 mbedtls_printf( " ok (%d skipped)\n", ret );
136
137 /*
138 * 1. Start the connection
139 */
140 mbedtls_printf( " . Connecting to tcp/%s/%s...", SERVER_NAME, SERVER_PORT );
141 fflush( stdout );
142
143 if( ( ret = mbedtls_net_connect( &server_fd, SERVER_NAME,
144 SERVER_PORT, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
145 {
146 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
147 goto exit;
148 }
149
150 mbedtls_printf( " ok\n" );
151
152 /*
153 * 2. Setup stuff
154 */
155 mbedtls_printf( " . Setting up the SSL/TLS structure..." );
156 fflush( stdout );
157
158 if( ( ret = mbedtls_ssl_config_defaults( &conf,
159 MBEDTLS_SSL_IS_CLIENT,
160 MBEDTLS_SSL_TRANSPORT_STREAM,
161 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
162 {
163 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
164 goto exit;
165 }
166
167 mbedtls_printf( " ok\n" );
168
169 /* OPTIONAL is not optimal for security,
170 * but makes interop easier in this simplified example */
171 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
172 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
173 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
174 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
175
176 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
177 {
178 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
179 goto exit;
180 }
181
182 if( ( ret = mbedtls_ssl_set_hostname( &ssl, SERVER_NAME ) ) != 0 )
183 {
184 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
185 goto exit;
186 }
187
188 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
189
190 /*
191 * 4. Handshake
192 */
193 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
194 fflush( stdout );
195
196 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
197 {
198 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
199 {
200 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned -0x%x\n\n", (unsigned int) -ret );
201 goto exit;
202 }
203 }
204
205 mbedtls_printf( " ok\n" );
206
207 /*
208 * 5. Verify the server certificate
209 */
210 mbedtls_printf( " . Verifying peer X.509 certificate..." );
211
212 /* In real life, we probably want to bail out when ret != 0 */
213 if( ( flags = mbedtls_ssl_get_verify_result( &ssl ) ) != 0 )
214 {
215 #if !defined(MBEDTLS_X509_REMOVE_INFO)
216 char vrfy_buf[512];
217 #endif
218
219 mbedtls_printf( " failed\n" );
220
221 #if !defined(MBEDTLS_X509_REMOVE_INFO)
222 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
223
224 mbedtls_printf( "%s\n", vrfy_buf );
225 #endif
226 }
227 else
228 mbedtls_printf( " ok\n" );
229
230 /*
231 * 3. Write the GET request
232 */
233 mbedtls_printf( " > Write to server:" );
234 fflush( stdout );
235
236 len = sprintf( (char *) buf, GET_REQUEST );
237
238 while( ( ret = mbedtls_ssl_write( &ssl, buf, len ) ) <= 0 )
239 {
240 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
241 {
242 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
243 goto exit;
244 }
245 }
246
247 len = ret;
248 mbedtls_printf( " %d bytes written\n\n%s", len, (char *) buf );
249
250 /*
251 * 7. Read the HTTP response
252 */
253 mbedtls_printf( " < Read from server:" );
254 fflush( stdout );
255
256 do
257 {
258 len = sizeof( buf ) - 1;
259 memset( buf, 0, sizeof( buf ) );
260 ret = mbedtls_ssl_read( &ssl, buf, len );
261
262 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
263 continue;
264
265 if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
266 break;
267
268 if( ret < 0 )
269 {
270 mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
271 break;
272 }
273
274 if( ret == 0 )
275 {
276 mbedtls_printf( "\n\nEOF\n\n" );
277 break;
278 }
279
280 len = ret;
281 mbedtls_printf( " %d bytes read\n\n%s", len, (char *) buf );
282 }
283 while( 1 );
284
285 mbedtls_ssl_close_notify( &ssl );
286
287 exit_code = MBEDTLS_EXIT_SUCCESS;
288
289 exit:
290
291 #ifdef MBEDTLS_ERROR_C
292 if( exit_code != MBEDTLS_EXIT_SUCCESS )
293 {
294 char error_buf[100];
295 mbedtls_strerror( ret, error_buf, 100 );
296 mbedtls_printf("Last error was: %d - %s\n\n", ret, error_buf );
297 }
298 #endif
299
300 mbedtls_net_free( &server_fd );
301
302 mbedtls_x509_crt_free( &cacert );
303 mbedtls_ssl_free( &ssl );
304 mbedtls_ssl_config_free( &conf );
305 mbedtls_ctr_drbg_free( &ctr_drbg );
306 mbedtls_entropy_free( &entropy );
307
308 #if defined(_WIN32)
309 mbedtls_printf( " + Press Enter to exit this program.\n" );
310 fflush( stdout ); getchar();
311 #endif
312
313 mbedtls_exit( exit_code );
314 }
315 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
316 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
317 MBEDTLS_PEM_PARSE_C && MBEDTLS_CTR_DRBG_C && MBEDTLS_X509_CRT_PARSE_C */
318