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