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 #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_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
40 !defined(MBEDTLS_CTR_DRBG_C) || defined(MBEDTLS_X509_REMOVE_INFO)
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_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
47 "MBEDTLS_CTR_DRBG_C not defined and/or MBEDTLS_X509_REMOVE_INFO defined.\n");
48 mbedtls_exit( 0 );
49 }
50 #else
51
52 #include "mbedtls/entropy.h"
53 #include "mbedtls/ctr_drbg.h"
54 #include "mbedtls/net_sockets.h"
55 #include "mbedtls/ssl.h"
56 #include "mbedtls/x509.h"
57 #include "mbedtls/debug.h"
58
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <string.h>
62
63 #define MODE_NONE 0
64 #define MODE_FILE 1
65 #define MODE_SSL 2
66
67 #define DFL_MODE MODE_NONE
68 #define DFL_FILENAME "cert.crt"
69 #define DFL_CA_FILE ""
70 #define DFL_CRL_FILE ""
71 #define DFL_CA_PATH ""
72 #define DFL_SERVER_NAME "localhost"
73 #define DFL_SERVER_PORT "4433"
74 #define DFL_DEBUG_LEVEL 0
75 #define DFL_PERMISSIVE 0
76
77 #define USAGE_IO \
78 " ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
79 " default: \"\" (none)\n" \
80 " crl_file=%%s The single CRL file you want to use\n" \
81 " default: \"\" (none)\n" \
82 " ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
83 " default: \"\" (none) (overrides ca_file)\n"
84
85 #define USAGE \
86 "\n usage: cert_app param=<>...\n" \
87 "\n acceptable parameters:\n" \
88 " mode=file|ssl default: none\n" \
89 " filename=%%s default: cert.crt\n" \
90 USAGE_IO \
91 " server_name=%%s default: localhost\n" \
92 " server_port=%%d default: 4433\n" \
93 " debug_level=%%d default: 0 (disabled)\n" \
94 " permissive=%%d default: 0 (disabled)\n" \
95 "\n"
96
97
98 /*
99 * global options
100 */
101 struct options
102 {
103 int mode; /* the mode to run the application in */
104 const char *filename; /* filename of the certificate file */
105 const char *ca_file; /* the file with the CA certificate(s) */
106 const char *crl_file; /* the file with the CRL to use */
107 const char *ca_path; /* the path with the CA certificate(s) reside */
108 const char *server_name; /* hostname of the server (client only) */
109 const char *server_port; /* port on which the ssl service runs */
110 int debug_level; /* level of debugging */
111 int permissive; /* permissive parsing */
112 } opt;
113
my_debug(void * ctx,int level,const char * file,int line,const char * str)114 static void my_debug( void *ctx, int level,
115 const char *file, int line,
116 const char *str )
117 {
118 ((void) level);
119
120 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
121 fflush( (FILE *) ctx );
122 }
123
my_verify(void * data,mbedtls_x509_crt * crt,int depth,uint32_t * flags)124 static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
125 {
126 char buf[1024];
127 ((void) data);
128
129 mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
130 mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
131 mbedtls_printf( "%s", buf );
132
133 if ( ( *flags ) == 0 )
134 mbedtls_printf( " This certificate has no flags\n" );
135 else
136 {
137 mbedtls_x509_crt_verify_info( buf, sizeof( buf ), " ! ", *flags );
138 mbedtls_printf( "%s\n", buf );
139 }
140
141 return( 0 );
142 }
143
main(int argc,char * argv[])144 int main( int argc, char *argv[] )
145 {
146 int ret = 1;
147 int exit_code = MBEDTLS_EXIT_FAILURE;
148 mbedtls_net_context server_fd;
149 unsigned char buf[1024];
150 mbedtls_entropy_context entropy;
151 mbedtls_ctr_drbg_context ctr_drbg;
152 mbedtls_ssl_context ssl;
153 mbedtls_ssl_config conf;
154 mbedtls_x509_crt cacert;
155 mbedtls_x509_crl cacrl;
156 int i, j;
157 uint32_t flags;
158 int verify = 0;
159 char *p, *q;
160 const char *pers = "cert_app";
161
162 /*
163 * Set to sane values
164 */
165 mbedtls_net_init( &server_fd );
166 mbedtls_ctr_drbg_init( &ctr_drbg );
167 mbedtls_ssl_init( &ssl );
168 mbedtls_ssl_config_init( &conf );
169 mbedtls_x509_crt_init( &cacert );
170 #if defined(MBEDTLS_X509_CRL_PARSE_C)
171 mbedtls_x509_crl_init( &cacrl );
172 #else
173 /* Zeroize structure as CRL parsing is not supported and we have to pass
174 it to the verify function */
175 memset( &cacrl, 0, sizeof(mbedtls_x509_crl) );
176 #endif
177
178 if( argc == 0 )
179 {
180 usage:
181 mbedtls_printf( USAGE );
182 goto exit;
183 }
184
185 opt.mode = DFL_MODE;
186 opt.filename = DFL_FILENAME;
187 opt.ca_file = DFL_CA_FILE;
188 opt.crl_file = DFL_CRL_FILE;
189 opt.ca_path = DFL_CA_PATH;
190 opt.server_name = DFL_SERVER_NAME;
191 opt.server_port = DFL_SERVER_PORT;
192 opt.debug_level = DFL_DEBUG_LEVEL;
193 opt.permissive = DFL_PERMISSIVE;
194
195 for( i = 1; i < argc; i++ )
196 {
197 p = argv[i];
198 if( ( q = strchr( p, '=' ) ) == NULL )
199 goto usage;
200 *q++ = '\0';
201
202 for( j = 0; p + j < q; j++ )
203 {
204 if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
205 argv[i][j] |= 0x20;
206 }
207
208 if( strcmp( p, "mode" ) == 0 )
209 {
210 if( strcmp( q, "file" ) == 0 )
211 opt.mode = MODE_FILE;
212 else if( strcmp( q, "ssl" ) == 0 )
213 opt.mode = MODE_SSL;
214 else
215 goto usage;
216 }
217 else if( strcmp( p, "filename" ) == 0 )
218 opt.filename = q;
219 else if( strcmp( p, "ca_file" ) == 0 )
220 opt.ca_file = q;
221 else if( strcmp( p, "crl_file" ) == 0 )
222 opt.crl_file = q;
223 else if( strcmp( p, "ca_path" ) == 0 )
224 opt.ca_path = q;
225 else if( strcmp( p, "server_name" ) == 0 )
226 opt.server_name = q;
227 else if( strcmp( p, "server_port" ) == 0 )
228 opt.server_port = q;
229 else if( strcmp( p, "debug_level" ) == 0 )
230 {
231 opt.debug_level = atoi( q );
232 if( opt.debug_level < 0 || opt.debug_level > 65535 )
233 goto usage;
234 }
235 else if( strcmp( p, "permissive" ) == 0 )
236 {
237 opt.permissive = atoi( q );
238 if( opt.permissive < 0 || opt.permissive > 1 )
239 goto usage;
240 }
241 else
242 goto usage;
243 }
244
245 /*
246 * 1.1. Load the trusted CA
247 */
248 mbedtls_printf( " . Loading the CA root certificate ..." );
249 fflush( stdout );
250
251 if( strlen( opt.ca_path ) )
252 {
253 if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
254 {
255 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n", (unsigned int) -ret );
256 goto exit;
257 }
258
259 verify = 1;
260 }
261 else if( strlen( opt.ca_file ) )
262 {
263 if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
264 {
265 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n", (unsigned int) -ret );
266 goto exit;
267 }
268
269 verify = 1;
270 }
271
272 mbedtls_printf( " ok (%d skipped)\n", ret );
273
274 #if defined(MBEDTLS_X509_CRL_PARSE_C)
275 if( strlen( opt.crl_file ) )
276 {
277 if( ( ret = mbedtls_x509_crl_parse_file( &cacrl, opt.crl_file ) ) != 0 )
278 {
279 mbedtls_printf( " failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n", (unsigned int) -ret );
280 goto exit;
281 }
282
283 verify = 1;
284 }
285 #endif
286
287 if( opt.mode == MODE_FILE )
288 {
289 mbedtls_x509_crt crt;
290 mbedtls_x509_crt *cur = &crt;
291 mbedtls_x509_crt_init( &crt );
292
293 /*
294 * 1.1. Load the certificate(s)
295 */
296 mbedtls_printf( "\n . Loading the certificate(s) ..." );
297 fflush( stdout );
298
299 ret = mbedtls_x509_crt_parse_file( &crt, opt.filename );
300
301 if( ret < 0 )
302 {
303 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret );
304 mbedtls_x509_crt_free( &crt );
305 goto exit;
306 }
307
308 if( opt.permissive == 0 && ret > 0 )
309 {
310 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n", ret );
311 mbedtls_x509_crt_free( &crt );
312 goto exit;
313 }
314
315 mbedtls_printf( " ok\n" );
316
317 /*
318 * 1.2 Print the certificate(s)
319 */
320 while( cur != NULL )
321 {
322 mbedtls_printf( " . Peer certificate information ...\n" );
323 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
324 cur );
325 if( ret == -1 )
326 {
327 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
328 mbedtls_x509_crt_free( &crt );
329 goto exit;
330 }
331
332 mbedtls_printf( "%s\n", buf );
333
334 cur = cur->next;
335 }
336
337 /*
338 * 1.3 Verify the certificate
339 */
340 if( verify )
341 {
342 mbedtls_printf( " . Verifying X.509 certificate..." );
343
344 if( ( ret = mbedtls_x509_crt_verify( &crt, &cacert, &cacrl, NULL, &flags,
345 my_verify, NULL ) ) != 0 )
346 {
347 char vrfy_buf[512];
348
349 mbedtls_printf( " failed\n" );
350
351 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
352
353 mbedtls_printf( "%s\n", vrfy_buf );
354 }
355 else
356 mbedtls_printf( " ok\n" );
357 }
358
359 mbedtls_x509_crt_free( &crt );
360 }
361 else if( opt.mode == MODE_SSL )
362 {
363 /*
364 * 1. Initialize the RNG and the session data
365 */
366 mbedtls_printf( "\n . Seeding the random number generator..." );
367 fflush( stdout );
368
369 mbedtls_entropy_init( &entropy );
370 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
371 (const unsigned char *) pers,
372 strlen( pers ) ) ) != 0 )
373 {
374 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
375 goto ssl_exit;
376 }
377
378 mbedtls_printf( " ok\n" );
379
380 #if defined(MBEDTLS_DEBUG_C)
381 mbedtls_debug_set_threshold( opt.debug_level );
382 #endif
383
384 /*
385 * 2. Start the connection
386 */
387 mbedtls_printf( " . SSL connection to tcp/%s/%s...", opt.server_name,
388 opt.server_port );
389 fflush( stdout );
390
391 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
392 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
393 {
394 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
395 goto ssl_exit;
396 }
397
398 /*
399 * 3. Setup stuff
400 */
401 if( ( ret = mbedtls_ssl_config_defaults( &conf,
402 MBEDTLS_SSL_IS_CLIENT,
403 MBEDTLS_SSL_TRANSPORT_STREAM,
404 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
405 {
406 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
407 goto exit;
408 }
409
410 if( verify )
411 {
412 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
413 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
414 mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
415 }
416 else
417 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
418
419 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
420 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
421
422 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
423 {
424 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
425 goto ssl_exit;
426 }
427
428 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
429 {
430 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
431 goto ssl_exit;
432 }
433
434 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
435
436 /*
437 * 4. Handshake
438 */
439 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
440 {
441 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
442 {
443 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
444 goto ssl_exit;
445 }
446 }
447
448 mbedtls_printf( " ok\n" );
449
450 /*
451 * 5. Print the certificate
452 */
453 #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
454 mbedtls_printf( " . Peer certificate information ... skipped\n" );
455 #else
456 mbedtls_printf( " . Peer certificate information ...\n" );
457 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
458 mbedtls_ssl_get_peer_cert( &ssl ) );
459 if( ret == -1 )
460 {
461 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
462 goto ssl_exit;
463 }
464
465 mbedtls_printf( "%s\n", buf );
466 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
467
468 mbedtls_ssl_close_notify( &ssl );
469
470 ssl_exit:
471 mbedtls_ssl_free( &ssl );
472 mbedtls_ssl_config_free( &conf );
473 }
474 else
475 goto usage;
476
477 exit_code = MBEDTLS_EXIT_SUCCESS;
478
479 exit:
480
481 mbedtls_net_free( &server_fd );
482 mbedtls_x509_crt_free( &cacert );
483 #if defined(MBEDTLS_X509_CRL_PARSE_C)
484 mbedtls_x509_crl_free( &cacrl );
485 #endif
486 mbedtls_ctr_drbg_free( &ctr_drbg );
487 mbedtls_entropy_free( &entropy );
488
489 #if defined(_WIN32)
490 mbedtls_printf( " + Press Enter to exit this program.\n" );
491 fflush( stdout ); getchar();
492 #endif
493
494 mbedtls_exit( exit_code );
495 }
496 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
497 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
498 MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
499