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 #if !defined(MBEDTLS_CONFIG_FILE)
21 #include "mbedtls/config.h"
22 #else
23 #include MBEDTLS_CONFIG_FILE
24 #endif
25
26 #if defined(MBEDTLS_PLATFORM_C)
27 #include "mbedtls/platform.h"
28 #else
29 #include <stdio.h>
30 #include <stdlib.h>
31 #define mbedtls_time time
32 #define mbedtls_time_t time_t
33 #define mbedtls_fprintf fprintf
34 #define mbedtls_printf printf
35 #define mbedtls_exit exit
36 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
37 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
38 #endif /* MBEDTLS_PLATFORM_C */
39
40 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
41 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
42 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
43 !defined(MBEDTLS_X509_CRT_PARSE_C) || !defined(MBEDTLS_FS_IO) || \
44 !defined(MBEDTLS_CTR_DRBG_C)
main(void)45 int main( void )
46 {
47 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
48 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
49 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
50 "MBEDTLS_X509_CRT_PARSE_C and/or MBEDTLS_FS_IO and/or "
51 "MBEDTLS_CTR_DRBG_C not defined.\n");
52 mbedtls_exit( 0 );
53 }
54 #else
55
56 #include "mbedtls/entropy.h"
57 #include "mbedtls/ctr_drbg.h"
58 #include "mbedtls/net_sockets.h"
59 #include "mbedtls/ssl.h"
60 #include "mbedtls/x509.h"
61 #include "mbedtls/debug.h"
62
63 #include <stdio.h>
64 #include <stdlib.h>
65 #include <string.h>
66
67 #define MODE_NONE 0
68 #define MODE_FILE 1
69 #define MODE_SSL 2
70
71 #define DFL_MODE MODE_NONE
72 #define DFL_FILENAME "cert.crt"
73 #define DFL_CA_FILE ""
74 #define DFL_CRL_FILE ""
75 #define DFL_CA_PATH ""
76 #define DFL_SERVER_NAME "localhost"
77 #define DFL_SERVER_PORT "4433"
78 #define DFL_DEBUG_LEVEL 0
79 #define DFL_PERMISSIVE 0
80
81 #define USAGE_IO \
82 " ca_file=%%s The single file containing the top-level CA(s) you fully trust\n" \
83 " default: \"\" (none)\n" \
84 " crl_file=%%s The single CRL file you want to use\n" \
85 " default: \"\" (none)\n" \
86 " ca_path=%%s The path containing the top-level CA(s) you fully trust\n" \
87 " default: \"\" (none) (overrides ca_file)\n"
88
89 #define USAGE \
90 "\n usage: cert_app param=<>...\n" \
91 "\n acceptable parameters:\n" \
92 " mode=file|ssl default: none\n" \
93 " filename=%%s default: cert.crt\n" \
94 USAGE_IO \
95 " server_name=%%s default: localhost\n" \
96 " server_port=%%d default: 4433\n" \
97 " debug_level=%%d default: 0 (disabled)\n" \
98 " permissive=%%d default: 0 (disabled)\n" \
99 "\n"
100
101
102 /*
103 * global options
104 */
105 struct options
106 {
107 int mode; /* the mode to run the application in */
108 const char *filename; /* filename of the certificate file */
109 const char *ca_file; /* the file with the CA certificate(s) */
110 const char *crl_file; /* the file with the CRL to use */
111 const char *ca_path; /* the path with the CA certificate(s) reside */
112 const char *server_name; /* hostname of the server (client only) */
113 const char *server_port; /* port on which the ssl service runs */
114 int debug_level; /* level of debugging */
115 int permissive; /* permissive parsing */
116 } opt;
117
my_debug(void * ctx,int level,const char * file,int line,const char * str)118 static void my_debug( void *ctx, int level,
119 const char *file, int line,
120 const char *str )
121 {
122 ((void) level);
123
124 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
125 fflush( (FILE *) ctx );
126 }
127
my_verify(void * data,mbedtls_x509_crt * crt,int depth,uint32_t * flags)128 static int my_verify( void *data, mbedtls_x509_crt *crt, int depth, uint32_t *flags )
129 {
130 char buf[1024];
131 ((void) data);
132
133 mbedtls_printf( "\nVerify requested for (Depth %d):\n", depth );
134 mbedtls_x509_crt_info( buf, sizeof( buf ) - 1, "", crt );
135 mbedtls_printf( "%s", buf );
136
137 if ( ( *flags ) == 0 )
138 mbedtls_printf( " This certificate has no flags\n" );
139 else
140 {
141 mbedtls_x509_crt_verify_info( buf, sizeof( buf ), " ! ", *flags );
142 mbedtls_printf( "%s\n", buf );
143 }
144
145 return( 0 );
146 }
147
main(int argc,char * argv[])148 int main( int argc, char *argv[] )
149 {
150 int ret = 1;
151 int exit_code = MBEDTLS_EXIT_FAILURE;
152 mbedtls_net_context server_fd;
153 unsigned char buf[1024];
154 mbedtls_entropy_context entropy;
155 mbedtls_ctr_drbg_context ctr_drbg;
156 mbedtls_ssl_context ssl;
157 mbedtls_ssl_config conf;
158 mbedtls_x509_crt cacert;
159 mbedtls_x509_crl cacrl;
160 int i, j;
161 uint32_t flags;
162 int verify = 0;
163 char *p, *q;
164 const char *pers = "cert_app";
165
166 /*
167 * Set to sane values
168 */
169 mbedtls_net_init( &server_fd );
170 mbedtls_ctr_drbg_init( &ctr_drbg );
171 mbedtls_ssl_init( &ssl );
172 mbedtls_ssl_config_init( &conf );
173 mbedtls_x509_crt_init( &cacert );
174 #if defined(MBEDTLS_X509_CRL_PARSE_C)
175 mbedtls_x509_crl_init( &cacrl );
176 #else
177 /* Zeroize structure as CRL parsing is not supported and we have to pass
178 it to the verify function */
179 memset( &cacrl, 0, sizeof(mbedtls_x509_crl) );
180 #endif
181
182 if( argc == 0 )
183 {
184 usage:
185 mbedtls_printf( USAGE );
186 goto exit;
187 }
188
189 opt.mode = DFL_MODE;
190 opt.filename = DFL_FILENAME;
191 opt.ca_file = DFL_CA_FILE;
192 opt.crl_file = DFL_CRL_FILE;
193 opt.ca_path = DFL_CA_PATH;
194 opt.server_name = DFL_SERVER_NAME;
195 opt.server_port = DFL_SERVER_PORT;
196 opt.debug_level = DFL_DEBUG_LEVEL;
197 opt.permissive = DFL_PERMISSIVE;
198
199 for( i = 1; i < argc; i++ )
200 {
201 p = argv[i];
202 if( ( q = strchr( p, '=' ) ) == NULL )
203 goto usage;
204 *q++ = '\0';
205
206 for( j = 0; p + j < q; j++ )
207 {
208 if( argv[i][j] >= 'A' && argv[i][j] <= 'Z' )
209 argv[i][j] |= 0x20;
210 }
211
212 if( strcmp( p, "mode" ) == 0 )
213 {
214 if( strcmp( q, "file" ) == 0 )
215 opt.mode = MODE_FILE;
216 else if( strcmp( q, "ssl" ) == 0 )
217 opt.mode = MODE_SSL;
218 else
219 goto usage;
220 }
221 else if( strcmp( p, "filename" ) == 0 )
222 opt.filename = q;
223 else if( strcmp( p, "ca_file" ) == 0 )
224 opt.ca_file = q;
225 else if( strcmp( p, "crl_file" ) == 0 )
226 opt.crl_file = q;
227 else if( strcmp( p, "ca_path" ) == 0 )
228 opt.ca_path = q;
229 else if( strcmp( p, "server_name" ) == 0 )
230 opt.server_name = q;
231 else if( strcmp( p, "server_port" ) == 0 )
232 opt.server_port = q;
233 else if( strcmp( p, "debug_level" ) == 0 )
234 {
235 opt.debug_level = atoi( q );
236 if( opt.debug_level < 0 || opt.debug_level > 65535 )
237 goto usage;
238 }
239 else if( strcmp( p, "permissive" ) == 0 )
240 {
241 opt.permissive = atoi( q );
242 if( opt.permissive < 0 || opt.permissive > 1 )
243 goto usage;
244 }
245 else
246 goto usage;
247 }
248
249 /*
250 * 1.1. Load the trusted CA
251 */
252 mbedtls_printf( " . Loading the CA root certificate ..." );
253 fflush( stdout );
254
255 if( strlen( opt.ca_path ) )
256 {
257 if( ( ret = mbedtls_x509_crt_parse_path( &cacert, opt.ca_path ) ) < 0 )
258 {
259 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_path returned -0x%x\n\n", (unsigned int) -ret );
260 goto exit;
261 }
262
263 verify = 1;
264 }
265 else if( strlen( opt.ca_file ) )
266 {
267 if( ( ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file ) ) < 0 )
268 {
269 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned -0x%x\n\n", (unsigned int) -ret );
270 goto exit;
271 }
272
273 verify = 1;
274 }
275
276 mbedtls_printf( " ok (%d skipped)\n", ret );
277
278 #if defined(MBEDTLS_X509_CRL_PARSE_C)
279 if( strlen( opt.crl_file ) )
280 {
281 if( ( ret = mbedtls_x509_crl_parse_file( &cacrl, opt.crl_file ) ) != 0 )
282 {
283 mbedtls_printf( " failed\n ! mbedtls_x509_crl_parse returned -0x%x\n\n", (unsigned int) -ret );
284 goto exit;
285 }
286
287 verify = 1;
288 }
289 #endif
290
291 if( opt.mode == MODE_FILE )
292 {
293 mbedtls_x509_crt crt;
294 mbedtls_x509_crt *cur = &crt;
295 mbedtls_x509_crt_init( &crt );
296
297 /*
298 * 1.1. Load the certificate(s)
299 */
300 mbedtls_printf( "\n . Loading the certificate(s) ..." );
301 fflush( stdout );
302
303 ret = mbedtls_x509_crt_parse_file( &crt, opt.filename );
304
305 if( ret < 0 )
306 {
307 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse_file returned %d\n\n", ret );
308 mbedtls_x509_crt_free( &crt );
309 goto exit;
310 }
311
312 if( opt.permissive == 0 && ret > 0 )
313 {
314 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse failed to parse %d certificates\n\n", ret );
315 mbedtls_x509_crt_free( &crt );
316 goto exit;
317 }
318
319 mbedtls_printf( " ok\n" );
320
321 /*
322 * 1.2 Print the certificate(s)
323 */
324 while( cur != NULL )
325 {
326 mbedtls_printf( " . Peer certificate information ...\n" );
327 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
328 cur );
329 if( ret == -1 )
330 {
331 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
332 mbedtls_x509_crt_free( &crt );
333 goto exit;
334 }
335
336 mbedtls_printf( "%s\n", buf );
337
338 cur = cur->next;
339 }
340
341 /*
342 * 1.3 Verify the certificate
343 */
344 if( verify )
345 {
346 mbedtls_printf( " . Verifying X.509 certificate..." );
347
348 if( ( ret = mbedtls_x509_crt_verify( &crt, &cacert, &cacrl, NULL, &flags,
349 my_verify, NULL ) ) != 0 )
350 {
351 char vrfy_buf[512];
352
353 mbedtls_printf( " failed\n" );
354
355 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
356
357 mbedtls_printf( "%s\n", vrfy_buf );
358 }
359 else
360 mbedtls_printf( " ok\n" );
361 }
362
363 mbedtls_x509_crt_free( &crt );
364 }
365 else if( opt.mode == MODE_SSL )
366 {
367 /*
368 * 1. Initialize the RNG and the session data
369 */
370 mbedtls_printf( "\n . Seeding the random number generator..." );
371 fflush( stdout );
372
373 mbedtls_entropy_init( &entropy );
374 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
375 (const unsigned char *) pers,
376 strlen( pers ) ) ) != 0 )
377 {
378 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
379 goto ssl_exit;
380 }
381
382 mbedtls_printf( " ok\n" );
383
384 #if defined(MBEDTLS_DEBUG_C)
385 mbedtls_debug_set_threshold( opt.debug_level );
386 #endif
387
388 /*
389 * 2. Start the connection
390 */
391 mbedtls_printf( " . SSL connection to tcp/%s/%s...", opt.server_name,
392 opt.server_port );
393 fflush( stdout );
394
395 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
396 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
397 {
398 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
399 goto ssl_exit;
400 }
401
402 /*
403 * 3. Setup stuff
404 */
405 if( ( ret = mbedtls_ssl_config_defaults( &conf,
406 MBEDTLS_SSL_IS_CLIENT,
407 MBEDTLS_SSL_TRANSPORT_STREAM,
408 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
409 {
410 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
411 goto exit;
412 }
413
414 if( verify )
415 {
416 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_REQUIRED );
417 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
418 mbedtls_ssl_conf_verify( &conf, my_verify, NULL );
419 }
420 else
421 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_NONE );
422
423 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
424 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
425
426 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
427 {
428 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
429 goto ssl_exit;
430 }
431
432 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
433 {
434 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
435 goto ssl_exit;
436 }
437
438 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
439
440 /*
441 * 4. Handshake
442 */
443 while( ( ret = mbedtls_ssl_handshake( &ssl ) ) != 0 )
444 {
445 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
446 {
447 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d\n\n", ret );
448 goto ssl_exit;
449 }
450 }
451
452 mbedtls_printf( " ok\n" );
453
454 /*
455 * 5. Print the certificate
456 */
457 #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
458 mbedtls_printf( " . Peer certificate information ... skipped\n" );
459 #else
460 mbedtls_printf( " . Peer certificate information ...\n" );
461 ret = mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
462 mbedtls_ssl_get_peer_cert( &ssl ) );
463 if( ret == -1 )
464 {
465 mbedtls_printf( " failed\n ! mbedtls_x509_crt_info returned %d\n\n", ret );
466 goto ssl_exit;
467 }
468
469 mbedtls_printf( "%s\n", buf );
470 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
471
472 mbedtls_ssl_close_notify( &ssl );
473
474 ssl_exit:
475 mbedtls_ssl_free( &ssl );
476 mbedtls_ssl_config_free( &conf );
477 }
478 else
479 goto usage;
480
481 exit_code = MBEDTLS_EXIT_SUCCESS;
482
483 exit:
484
485 mbedtls_net_free( &server_fd );
486 mbedtls_x509_crt_free( &cacert );
487 #if defined(MBEDTLS_X509_CRL_PARSE_C)
488 mbedtls_x509_crl_free( &cacrl );
489 #endif
490 mbedtls_ctr_drbg_free( &ctr_drbg );
491 mbedtls_entropy_free( &entropy );
492
493 #if defined(_WIN32)
494 mbedtls_printf( " + Press Enter to exit this program.\n" );
495 fflush( stdout ); getchar();
496 #endif
497
498 mbedtls_exit( exit_code );
499 }
500 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
501 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C &&
502 MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_FS_IO && MBEDTLS_CTR_DRBG_C */
503