1 /*
2 * Certificate reading application
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_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
71 !defined(MBEDTLS_CTR_DRBG_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_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
78 "MBEDTLS_CTR_DRBG_C not defined.\n");
79 mbedtls_exit( 0 );
80 }
81 #else
82
83 #include "mbedtls/entropy.h"
84 #include "mbedtls/ctr_drbg.h"
85 #include "mbedtls/net_sockets.h"
86 #include "mbedtls/ssl.h"
87 #include "mbedtls/x509.h"
88 #include "mbedtls/debug.h"
89
90 #include <stdio.h>
91 #include <stdlib.h>
92 #include <string.h>
93
94 #define MODE_NONE 0
95 #define MODE_FILE 1
96 #define MODE_SSL 2
97
98 #define DFL_MODE MODE_NONE
99 #define DFL_FILENAME "cert.crt"
100 #define DFL_CA_FILE ""
101 #define DFL_CRL_FILE ""
102 #define DFL_CA_PATH ""
103 #define DFL_SERVER_NAME "localhost"
104 #define DFL_SERVER_PORT "4433"
105 #define DFL_DEBUG_LEVEL 0
106 #define DFL_PERMISSIVE 0
107
108 #define USAGE_IO \
109 " ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
110 " default: \"\" (none)\n" \
111 " crl_file=%%s The single CRL file you want to use\n" \
112 " default: \"\" (none)\n" \
113 " ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
114 " default: \"\" (none) (overrides ca_file)\n"
115
116 #define USAGE \
117 "\n usage: cert_app param=<>...\n" \
118 "\n acceptable parameters:\n" \
119 " mode=file|ssl default: none\n" \
120 " filename=%%s default: cert.crt\n" \
121 USAGE_IO \
122 " server_name=%%s default: localhost\n" \
123 " server_port=%%d default: 4433\n" \
124 " debug_level=%%d default: 0 (disabled)\n" \
125 " permissive=%%d default: 0 (disabled)\n" \
126 "\n"
127
128
129 /*
130 * global options
131 */
132 struct options
133 {
134 int mode; /* the mode to run the application in */
135 const char *filename; /* filename of the certificate file */
136 const char *ca_file; /* the file with the CA certificate(s) */
137 const char *crl_file; /* the file with the CRL to use */
138 const char *ca_path; /* the path with the CA certificate(s) reside */
139 const char *server_name; /* hostname of the server (client only) */
140 const char *server_port; /* port on which the ssl service runs */
141 int debug_level; /* level of debugging */
142 int permissive; /* permissive parsing */
143 } opt;
144
my_debug(void * ctx,int level,const char * file,int line,const char * str)145 static void my_debug( void *ctx, int level,
146 const char *file, int line,
147 const char *str )
148 {
149 ((void) level);
150
151 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
152 fflush( (FILE *) ctx );
153 }
154
my_verify(void * data,mbedtls_x509_crt * crt,int depth,uint32_t * flags)155 static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
156 {
157 char buf[1024];
158 ((void) data);
159
160 mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
161 mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
162 mbedtls_printf( "%s", buf );
163
164 if ( ( *flags ) == 0 )
165 mbedtls_printf( " This certificate has no flags\n" );
166 else
167 {
168 mbedtls_x509_crt_verify_info( buf, sizeof( buf ), " ! ", *flags );
169 mbedtls_printf( "%s\n", buf );
170 }
171
172 return( 0 );
173 }
174
main(int argc,char * argv[])175 int main( int argc, char *argv[] )
176 {
177 int ret = 1;
178 int exit_code = MBEDTLS_EXIT_FAILURE;
179 mbedtls_net_context server_fd;
180 unsigned char buf[1024];
181 mbedtls_entropy_context entropy;
182 mbedtls_ctr_drbg_context ctr_drbg;
183 mbedtls_ssl_context ssl;
184 mbedtls_ssl_config conf;
185 mbedtls_x509_crt cacert;
186 mbedtls_x509_crl cacrl;
187 int i, j;
188 uint32_t flags;
189 int verify = 0;
190 char *p, *q;
191 const char *pers = "cert_app";
192
193 /*
194 * Set to sane values
195 */
196 mbedtls_net_init( &server_fd );
197 mbedtls_ctr_drbg_init( &ctr_drbg );
198 mbedtls_ssl_init( &ssl );
199 mbedtls_ssl_config_init( &conf );
200 mbedtls_x509_crt_init( &cacert );
201 #if defined(MBEDTLS_X509_CRL_PARSE_C)
202 mbedtls_x509_crl_init( &cacrl );
203 #else
204 /* Zeroize structure as CRL parsing is not supported and we have to pass
205 it to the verify function */
206 memset( &cacrl, 0, sizeof(mbedtls_x509_crl) );
207 #endif
208
209 if( argc == 0 )
210 {
211 usage:
212 mbedtls_printf( USAGE );
213 goto exit;
214 }
215
216 opt.mode = DFL_MODE;
217 opt.filename = DFL_FILENAME;
218 opt.ca_file = DFL_CA_FILE;
219 opt.crl_file = DFL_CRL_FILE;
220 opt.ca_path = DFL_CA_PATH;
221 opt.server_name = DFL_SERVER_NAME;
222 opt.server_port = DFL_SERVER_PORT;
223 opt.debug_level = DFL_DEBUG_LEVEL;
224 opt.permissive = DFL_PERMISSIVE;
225
226 for( i = 1; i < argc; i++ )
227 {
228 p = argv[i];
229 if( ( q = strchr( p, '=' ) ) == NULL )
230 goto usage;
231 *q++ = '\0';
232
233 for( j = 0; p + j < q; j++ )
234 {
235 if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
236 argv[i][j] |= 0x20;
237 }
238
239 if( strcmp( p, "mode" ) == 0 )
240 {
241 if( strcmp( q, "file" ) == 0 )
242 opt.mode = MODE_FILE;
243 else if( strcmp( q, "ssl" ) == 0 )
244 opt.mode = MODE_SSL;
245 else
246 goto usage;
247 }
248 else if( strcmp( p, "filename" ) == 0 )
249 opt.filename = q;
250 else if( strcmp( p, "ca_file" ) == 0 )
251 opt.ca_file = q;
252 else if( strcmp( p, "crl_file" ) == 0 )
253 opt.crl_file = q;
254 else if( strcmp( p, "ca_path" ) == 0 )
255 opt.ca_path = q;
256 else if( strcmp( p, "server_name" ) == 0 )
257 opt.server_name = q;
258 else if( strcmp( p, "server_port" ) == 0 )
259 opt.server_port = q;
260 else if( strcmp( p, "debug_level" ) == 0 )
261 {
262 opt.debug_level = atoi( q );
263 if( opt.debug_level < 0 || opt.debug_level > 65535 )
264 goto usage;
265 }
266 else if( strcmp( p, "permissive" ) == 0 )
267 {
268 opt.permissive = atoi( q );
269 if( opt.permissive < 0 || opt.permissive > 1 )
270 goto usage;
271 }
272 else
273 goto usage;
274 }
275
276 /*
277 * 1.1. Load the trusted CA
278 */
279 mbedtls_printf( " . Loading the CA root certificate ..." );
280 fflush( stdout );
281
282 if( strlen( opt.ca_path ) )
283 {
284 if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
285 {
286 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n", -ret );
287 goto exit;
288 }
289
290 verify = 1;
291 }
292 else if( strlen( opt.ca_file ) )
293 {
294 if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
295 {
296 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n", -ret );
297 goto exit;
298 }
299
300 verify = 1;
301 }
302
303 mbedtls_printf( " ok (%d skipped)\n", ret );
304
305 #if defined(MBEDTLS_X509_CRL_PARSE_C)
306 if( strlen( opt.crl_file ) )
307 {
308 if( ( ret = mbedtls_x509_crl_parse_file( &cacrl, opt.crl_file ) ) != 0 )
309 {
310 mbedtls_printf( " failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n", -ret );
311 goto exit;
312 }
313
314 verify = 1;
315 }
316 #endif
317
318 if( opt.mode == MODE_FILE )
319 {
320 mbedtls_x509_crt crt;
321 mbedtls_x509_crt *cur = &crt;
322 mbedtls_x509_crt_init( &crt );
323
324 /*
325 * 1.1. Load the certificate(s)
326 */
327 mbedtls_printf( "\n . Loading the certificate(s) ..." );
328 fflush( stdout );
329
330 ret = mbedtls_x509_crt_parse_file( &crt, opt.filename );
331
332 if( ret < 0 )
333 {
334 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret );
335 mbedtls_x509_crt_free( &crt );
336 goto exit;
337 }
338
339 if( opt.permissive == 0 && ret > 0 )
340 {
341 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n", ret );
342 mbedtls_x509_crt_free( &crt );
343 goto exit;
344 }
345
346 mbedtls_printf( " ok\n" );
347
348 /*
349 * 1.2 Print the certificate(s)
350 */
351 while( cur != NULL )
352 {
353 mbedtls_printf( " . Peer certificate information ...\n" );
354 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
355 cur );
356 if( ret == -1 )
357 {
358 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
359 mbedtls_x509_crt_free( &crt );
360 goto exit;
361 }
362
363 mbedtls_printf( "%s\n", buf );
364
365 cur = cur->next;
366 }
367
368 /*
369 * 1.3 Verify the certificate
370 */
371 if( verify )
372 {
373 mbedtls_printf( " . Verifying X.509 certificate..." );
374
375 if( ( ret = mbedtls_x509_crt_verify( &crt, &cacert, &cacrl, NULL, &flags,
376 my_verify, NULL ) ) != 0 )
377 {
378 char vrfy_buf[512];
379
380 mbedtls_printf( " failed\n" );
381
382 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
383
384 mbedtls_printf( "%s\n", vrfy_buf );
385 }
386 else
387 mbedtls_printf( " ok\n" );
388 }
389
390 mbedtls_x509_crt_free( &crt );
391 }
392 else if( opt.mode == MODE_SSL )
393 {
394 /*
395 * 1. Initialize the RNG and the session data
396 */
397 mbedtls_printf( "\n . Seeding the random number generator..." );
398 fflush( stdout );
399
400 mbedtls_entropy_init( &entropy );
401 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
402 (const unsigned char *) pers,
403 strlen( pers ) ) ) != 0 )
404 {
405 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
406 goto ssl_exit;
407 }
408
409 mbedtls_printf( " ok\n" );
410
411 #if defined(MBEDTLS_DEBUG_C)
412 mbedtls_debug_set_threshold( opt.debug_level );
413 #endif
414
415 /*
416 * 2. Start the connection
417 */
418 mbedtls_printf( " . SSL connection to tcp/%s/%s...", opt.server_name,
419 opt.server_port );
420 fflush( stdout );
421
422 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
423 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
424 {
425 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
426 goto ssl_exit;
427 }
428
429 /*
430 * 3. Setup stuff
431 */
432 if( ( ret = mbedtls_ssl_config_defaults( &conf,
433 MBEDTLS_SSL_IS_CLIENT,
434 MBEDTLS_SSL_TRANSPORT_STREAM,
435 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
436 {
437 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
438 goto exit;
439 }
440
441 if( verify )
442 {
443 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
444 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
445 mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
446 }
447 else
448 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
449
450 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
451 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
452
453 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
454 {
455 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
456 goto ssl_exit;
457 }
458
459 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
460 {
461 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
462 goto ssl_exit;
463 }
464
465 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
466
467 /*
468 * 4. Handshake
469 */
470 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
471 {
472 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
473 {
474 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
475 goto ssl_exit;
476 }
477 }
478
479 mbedtls_printf( " ok\n" );
480
481 /*
482 * 5. Print the certificate
483 */
484 mbedtls_printf( " . Peer certificate information ...\n" );
485 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
486 ssl.session->peer_cert );
487 if( ret == -1 )
488 {
489 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
490 goto ssl_exit;
491 }
492
493 mbedtls_printf( "%s\n", buf );
494
495 mbedtls_ssl_close_notify( &ssl );
496
497 ssl_exit:
498 mbedtls_ssl_free( &ssl );
499 mbedtls_ssl_config_free( &conf );
500 }
501 else
502 goto usage;
503
504 exit_code = MBEDTLS_EXIT_SUCCESS;
505
506 exit:
507
508 mbedtls_net_free( &server_fd );
509 mbedtls_x509_crt_free( &cacert );
510 #if defined(MBEDTLS_X509_CRL_PARSE_C)
511 mbedtls_x509_crl_free( &cacrl );
512 #endif
513 mbedtls_ctr_drbg_free( &ctr_drbg );
514 mbedtls_entropy_free( &entropy );
515
516 #if defined(_WIN32)
517 mbedtls_printf( " + Press Enter to exit this program.\n" );
518 fflush( stdout ); getchar();
519 #endif
520
521 mbedtls_exit( exit_code );
522 }
523 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
524 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
525 MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
526