1 /*
2 * Certificate reading application
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 #include "mbedtls/platform.h"
23
24 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
25 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
26 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
27 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
28 !defined(MBEDTLS_CTR_DRBG_C) || defined(MBEDTLS_X509_REMOVE_INFO)
main(void)29 int main( void )
30 {
31 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
32 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
33 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
34 "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
35 "MBEDTLS_CTR_DRBG_C not defined and/or MBEDTLS_X509_REMOVE_INFO defined.\n");
36 mbedtls_exit( 0 );
37 }
38 #else
39
40 #include "mbedtls/entropy.h"
41 #include "mbedtls/ctr_drbg.h"
42 #include "mbedtls/net_sockets.h"
43 #include "mbedtls/ssl.h"
44 #include "mbedtls/x509.h"
45 #include "mbedtls/debug.h"
46
47 #include <stdio.h>
48 #include <stdlib.h>
49 #include <string.h>
50
51 #define MODE_NONE 0
52 #define MODE_FILE 1
53 #define MODE_SSL 2
54
55 #define DFL_MODE MODE_NONE
56 #define DFL_FILENAME "cert.crt"
57 #define DFL_CA_FILE ""
58 #define DFL_CRL_FILE ""
59 #define DFL_CA_PATH ""
60 #define DFL_SERVER_NAME "localhost"
61 #define DFL_SERVER_PORT "4433"
62 #define DFL_DEBUG_LEVEL 0
63 #define DFL_PERMISSIVE 0
64
65 #define USAGE_IO \
66 " ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
67 " default: \"\" (none)\n" \
68 " crl_file=%%s The single CRL file you want to use\n" \
69 " default: \"\" (none)\n" \
70 " ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
71 " default: \"\" (none) (overrides ca_file)\n"
72
73 #define USAGE \
74 "\n usage: cert_app param=<>...\n" \
75 "\n acceptable parameters:\n" \
76 " mode=file|ssl default: none\n" \
77 " filename=%%s default: cert.crt\n" \
78 USAGE_IO \
79 " server_name=%%s default: localhost\n" \
80 " server_port=%%d default: 4433\n" \
81 " debug_level=%%d default: 0 (disabled)\n" \
82 " permissive=%%d default: 0 (disabled)\n" \
83 "\n"
84
85
86 /*
87 * global options
88 */
89 struct options
90 {
91 int mode; /* the mode to run the application in */
92 const char *filename; /* filename of the certificate file */
93 const char *ca_file; /* the file with the CA certificate(s) */
94 const char *crl_file; /* the file with the CRL to use */
95 const char *ca_path; /* the path with the CA certificate(s) reside */
96 const char *server_name; /* hostname of the server (client only) */
97 const char *server_port; /* port on which the ssl service runs */
98 int debug_level; /* level of debugging */
99 int permissive; /* permissive parsing */
100 } opt;
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
my_verify(void * data,mbedtls_x509_crt * crt,int depth,uint32_t * flags)112 static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
113 {
114 char buf[1024];
115 ((void) data);
116
117 mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
118 mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
119 mbedtls_printf( "%s", buf );
120
121 if ( ( *flags ) == 0 )
122 mbedtls_printf( " This certificate has no flags\n" );
123 else
124 {
125 mbedtls_x509_crt_verify_info( buf, sizeof( buf ), " ! ", *flags );
126 mbedtls_printf( "%s\n", buf );
127 }
128
129 return( 0 );
130 }
131
main(int argc,char * argv[])132 int main( int argc, char *argv[] )
133 {
134 int ret = 1;
135 int exit_code = MBEDTLS_EXIT_FAILURE;
136 mbedtls_net_context server_fd;
137 unsigned char buf[1024];
138 mbedtls_entropy_context entropy;
139 mbedtls_ctr_drbg_context ctr_drbg;
140 mbedtls_ssl_context ssl;
141 mbedtls_ssl_config conf;
142 mbedtls_x509_crt cacert;
143 mbedtls_x509_crl cacrl;
144 int i, j;
145 uint32_t flags;
146 int verify = 0;
147 char *p, *q;
148 const char *pers = "cert_app";
149
150 /*
151 * Set to sane values
152 */
153 mbedtls_net_init( &server_fd );
154 mbedtls_ctr_drbg_init( &ctr_drbg );
155 mbedtls_ssl_init( &ssl );
156 mbedtls_ssl_config_init( &conf );
157 mbedtls_x509_crt_init( &cacert );
158 #if defined(MBEDTLS_X509_CRL_PARSE_C)
159 mbedtls_x509_crl_init( &cacrl );
160 #else
161 /* Zeroize structure as CRL parsing is not supported and we have to pass
162 it to the verify function */
163 memset( &cacrl, 0, sizeof(mbedtls_x509_crl) );
164 #endif
165
166 if( argc == 0 )
167 {
168 usage:
169 mbedtls_printf( USAGE );
170 goto exit;
171 }
172
173 opt.mode = DFL_MODE;
174 opt.filename = DFL_FILENAME;
175 opt.ca_file = DFL_CA_FILE;
176 opt.crl_file = DFL_CRL_FILE;
177 opt.ca_path = DFL_CA_PATH;
178 opt.server_name = DFL_SERVER_NAME;
179 opt.server_port = DFL_SERVER_PORT;
180 opt.debug_level = DFL_DEBUG_LEVEL;
181 opt.permissive = DFL_PERMISSIVE;
182
183 for( i = 1; i < argc; i++ )
184 {
185 p = argv[i];
186 if( ( q = strchr( p, '=' ) ) == NULL )
187 goto usage;
188 *q++ = '\0';
189
190 for( j = 0; p + j < q; j++ )
191 {
192 if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
193 argv[i][j] |= 0x20;
194 }
195
196 if( strcmp( p, "mode" ) == 0 )
197 {
198 if( strcmp( q, "file" ) == 0 )
199 opt.mode = MODE_FILE;
200 else if( strcmp( q, "ssl" ) == 0 )
201 opt.mode = MODE_SSL;
202 else
203 goto usage;
204 }
205 else if( strcmp( p, "filename" ) == 0 )
206 opt.filename = q;
207 else if( strcmp( p, "ca_file" ) == 0 )
208 opt.ca_file = q;
209 else if( strcmp( p, "crl_file" ) == 0 )
210 opt.crl_file = q;
211 else if( strcmp( p, "ca_path" ) == 0 )
212 opt.ca_path = q;
213 else if( strcmp( p, "server_name" ) == 0 )
214 opt.server_name = q;
215 else if( strcmp( p, "server_port" ) == 0 )
216 opt.server_port = q;
217 else if( strcmp( p, "debug_level" ) == 0 )
218 {
219 opt.debug_level = atoi( q );
220 if( opt.debug_level < 0 || opt.debug_level > 65535 )
221 goto usage;
222 }
223 else if( strcmp( p, "permissive" ) == 0 )
224 {
225 opt.permissive = atoi( q );
226 if( opt.permissive < 0 || opt.permissive > 1 )
227 goto usage;
228 }
229 else
230 goto usage;
231 }
232
233 /*
234 * 1.1. Load the trusted CA
235 */
236 mbedtls_printf( " . Loading the CA root certificate ..." );
237 fflush( stdout );
238
239 if( strlen( opt.ca_path ) )
240 {
241 if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
242 {
243 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n", (unsigned int) -ret );
244 goto exit;
245 }
246
247 verify = 1;
248 }
249 else if( strlen( opt.ca_file ) )
250 {
251 if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
252 {
253 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n", (unsigned int) -ret );
254 goto exit;
255 }
256
257 verify = 1;
258 }
259
260 mbedtls_printf( " ok (%d skipped)\n", ret );
261
262 #if defined(MBEDTLS_X509_CRL_PARSE_C)
263 if( strlen( opt.crl_file ) )
264 {
265 if( ( ret = mbedtls_x509_crl_parse_file( &cacrl, opt.crl_file ) ) != 0 )
266 {
267 mbedtls_printf( " failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n", (unsigned int) -ret );
268 goto exit;
269 }
270
271 verify = 1;
272 }
273 #endif
274
275 if( opt.mode == MODE_FILE )
276 {
277 mbedtls_x509_crt crt;
278 mbedtls_x509_crt *cur = &crt;
279 mbedtls_x509_crt_init( &crt );
280
281 /*
282 * 1.1. Load the certificate(s)
283 */
284 mbedtls_printf( "\n . Loading the certificate(s) ..." );
285 fflush( stdout );
286
287 ret = mbedtls_x509_crt_parse_file( &crt, opt.filename );
288
289 if( ret < 0 )
290 {
291 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret );
292 mbedtls_x509_crt_free( &crt );
293 goto exit;
294 }
295
296 if( opt.permissive == 0 && ret > 0 )
297 {
298 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n", ret );
299 mbedtls_x509_crt_free( &crt );
300 goto exit;
301 }
302
303 mbedtls_printf( " ok\n" );
304
305 /*
306 * 1.2 Print the certificate(s)
307 */
308 while( cur != NULL )
309 {
310 mbedtls_printf( " . Peer certificate information ...\n" );
311 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
312 cur );
313 if( ret == -1 )
314 {
315 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
316 mbedtls_x509_crt_free( &crt );
317 goto exit;
318 }
319
320 mbedtls_printf( "%s\n", buf );
321
322 cur = cur->next;
323 }
324
325 /*
326 * 1.3 Verify the certificate
327 */
328 if( verify )
329 {
330 mbedtls_printf( " . Verifying X.509 certificate..." );
331
332 if( ( ret = mbedtls_x509_crt_verify( &crt, &cacert, &cacrl, NULL, &flags,
333 my_verify, NULL ) ) != 0 )
334 {
335 char vrfy_buf[512];
336
337 mbedtls_printf( " failed\n" );
338
339 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
340
341 mbedtls_printf( "%s\n", vrfy_buf );
342 }
343 else
344 mbedtls_printf( " ok\n" );
345 }
346
347 mbedtls_x509_crt_free( &crt );
348 }
349 else if( opt.mode == MODE_SSL )
350 {
351 /*
352 * 1. Initialize the RNG and the session data
353 */
354 mbedtls_printf( "\n . Seeding the random number generator..." );
355 fflush( stdout );
356
357 mbedtls_entropy_init( &entropy );
358 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
359 (const unsigned char *) pers,
360 strlen( pers ) ) ) != 0 )
361 {
362 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
363 goto ssl_exit;
364 }
365
366 mbedtls_printf( " ok\n" );
367
368 #if defined(MBEDTLS_DEBUG_C)
369 mbedtls_debug_set_threshold( opt.debug_level );
370 #endif
371
372 /*
373 * 2. Start the connection
374 */
375 mbedtls_printf( " . SSL connection to tcp/%s/%s...", opt.server_name,
376 opt.server_port );
377 fflush( stdout );
378
379 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
380 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
381 {
382 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
383 goto ssl_exit;
384 }
385
386 /*
387 * 3. Setup stuff
388 */
389 if( ( ret = mbedtls_ssl_config_defaults( &conf,
390 MBEDTLS_SSL_IS_CLIENT,
391 MBEDTLS_SSL_TRANSPORT_STREAM,
392 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
393 {
394 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
395 goto exit;
396 }
397
398 if( verify )
399 {
400 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
401 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
402 mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
403 }
404 else
405 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
406
407 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
408 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
409
410 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
411 {
412 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
413 goto ssl_exit;
414 }
415
416 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
417 {
418 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
419 goto ssl_exit;
420 }
421
422 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
423
424 /*
425 * 4. Handshake
426 */
427 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
428 {
429 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
430 {
431 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
432 goto ssl_exit;
433 }
434 }
435
436 mbedtls_printf( " ok\n" );
437
438 /*
439 * 5. Print the certificate
440 */
441 #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
442 mbedtls_printf( " . Peer certificate information ... skipped\n" );
443 #else
444 mbedtls_printf( " . Peer certificate information ...\n" );
445 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
446 mbedtls_ssl_get_peer_cert( &ssl ) );
447 if( ret == -1 )
448 {
449 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
450 goto ssl_exit;
451 }
452
453 mbedtls_printf( "%s\n", buf );
454 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
455
456 mbedtls_ssl_close_notify( &ssl );
457
458 ssl_exit:
459 mbedtls_ssl_free( &ssl );
460 mbedtls_ssl_config_free( &conf );
461 }
462 else
463 goto usage;
464
465 exit_code = MBEDTLS_EXIT_SUCCESS;
466
467 exit:
468
469 mbedtls_net_free( &server_fd );
470 mbedtls_x509_crt_free( &cacert );
471 #if defined(MBEDTLS_X509_CRL_PARSE_C)
472 mbedtls_x509_crl_free( &cacrl );
473 #endif
474 mbedtls_ctr_drbg_free( &ctr_drbg );
475 mbedtls_entropy_free( &entropy );
476
477 mbedtls_exit( exit_code );
478 }
479 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
480 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
481 MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
482
