]> git.zerfleddert.de Git - proxmark3-svn/blob - common/mbedtls/x509.c
projects / proxmark3-svn / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
blame | history | raw | HEAD
Ndef and MAD (#801)
[proxmark3-svn] / common / mbedtls / x509.c
1 /*
2 * X.509 common functions for parsing and verification
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: GPL-2.0
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * This file is part of mbed TLS (https://tls.mbed.org)
22 */
23 /*
24 * The ITU-T X.509 standard defines a certificate format for PKI.
25 *
26 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
27 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
28 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
29 *
30 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
31 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
32 */
33
34 /* Ensure gmtime_r is available even with -std=c99; must be included before
35 * config.h, which pulls in glibc's features.h. Harmless on other platforms. */
36 #define _POSIX_C_SOURCE 200112L
37
38 #if !defined(MBEDTLS_CONFIG_FILE)
39 #include "mbedtls/config.h"
40 #else
41 #include MBEDTLS_CONFIG_FILE
42 #endif
43
44 #if defined(MBEDTLS_X509_USE_C)
45
46 #include "mbedtls/x509.h"
47 #include "mbedtls/asn1.h"
48 #include "mbedtls/oid.h"
49
50 #include <stdio.h>
51 #include <string.h>
52
53 #if defined(MBEDTLS_PEM_PARSE_C)
54 #include "mbedtls/pem.h"
55 #endif
56
57 #if defined(MBEDTLS_PLATFORM_C)
58 #include "mbedtls/platform.h"
59 #else
60 #include <stdio.h>
61 #include <stdlib.h>
62 #define mbedtls_free free
63 #define mbedtls_calloc calloc
64 #define mbedtls_printf printf
65 #define mbedtls_snprintf snprintf
66 #endif
67
68 #if defined(MBEDTLS_HAVE_TIME)
69 #include "mbedtls/platform_time.h"
70 #endif
71 #if defined(MBEDTLS_HAVE_TIME_DATE)
72 #include <time.h>
73 #endif
74
75 #define CHECK(code) if( ( ret = code ) != 0 ){ return( ret ); }
76 #define CHECK_RANGE(min, max, val) if( val < min || val > max ){ return( ret ); }
77
78 /*
79 * CertificateSerialNumber ::= INTEGER
80 */
81 int mbedtls_x509_get_serial( unsigned char **p, const unsigned char *end,
82 mbedtls_x509_buf *serial )
83 {
84 int ret;
85
86 if( ( end - *p ) < 1 )
87 return( MBEDTLS_ERR_X509_INVALID_SERIAL +
88 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
89
90 if( **p != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_PRIMITIVE | 2 ) &&
91 **p != MBEDTLS_ASN1_INTEGER )
92 return( MBEDTLS_ERR_X509_INVALID_SERIAL +
93 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
94
95 serial->tag = *(*p)++;
96
97 if( ( ret = mbedtls_asn1_get_len( p, end, &serial->len ) ) != 0 )
98 return( MBEDTLS_ERR_X509_INVALID_SERIAL + ret );
99
100 serial->p = *p;
101 *p += serial->len;
102
103 return( 0 );
104 }
105
106 /* Get an algorithm identifier without parameters (eg for signatures)
107 *
108 * AlgorithmIdentifier ::= SEQUENCE {
109 * algorithm OBJECT IDENTIFIER,
110 * parameters ANY DEFINED BY algorithm OPTIONAL }
111 */
112 int mbedtls_x509_get_alg_null( unsigned char **p, const unsigned char *end,
113 mbedtls_x509_buf *alg )
114 {
115 int ret;
116
117 if( ( ret = mbedtls_asn1_get_alg_null( p, end, alg ) ) != 0 )
118 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
119
120 return( 0 );
121 }
122
123 /*
124 * Parse an algorithm identifier with (optional) paramaters
125 */
126 int mbedtls_x509_get_alg( unsigned char **p, const unsigned char *end,
127 mbedtls_x509_buf *alg, mbedtls_x509_buf *params )
128 {
129 int ret;
130
131 if( ( ret = mbedtls_asn1_get_alg( p, end, alg, params ) ) != 0 )
132 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
133
134 return( 0 );
135 }
136
137 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
138 /*
139 * HashAlgorithm ::= AlgorithmIdentifier
140 *
141 * AlgorithmIdentifier ::= SEQUENCE {
142 * algorithm OBJECT IDENTIFIER,
143 * parameters ANY DEFINED BY algorithm OPTIONAL }
144 *
145 * For HashAlgorithm, parameters MUST be NULL or absent.
146 */
147 static int x509_get_hash_alg( const mbedtls_x509_buf *alg, mbedtls_md_type_t *md_alg )
148 {
149 int ret;
150 unsigned char *p;
151 const unsigned char *end;
152 mbedtls_x509_buf md_oid;
153 size_t len;
154
155 /* Make sure we got a SEQUENCE and setup bounds */
156 if( alg->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
157 return( MBEDTLS_ERR_X509_INVALID_ALG +
158 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
159
160 p = (unsigned char *) alg->p;
161 end = p + alg->len;
162
163 if( p >= end )
164 return( MBEDTLS_ERR_X509_INVALID_ALG +
165 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
166
167 /* Parse md_oid */
168 md_oid.tag = *p;
169
170 if( ( ret = mbedtls_asn1_get_tag( &p, end, &md_oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
171 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
172
173 md_oid.p = p;
174 p += md_oid.len;
175
176 /* Get md_alg from md_oid */
177 if( ( ret = mbedtls_oid_get_md_alg( &md_oid, md_alg ) ) != 0 )
178 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
179
180 /* Make sure params is absent of NULL */
181 if( p == end )
182 return( 0 );
183
184 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_NULL ) ) != 0 || len != 0 )
185 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
186
187 if( p != end )
188 return( MBEDTLS_ERR_X509_INVALID_ALG +
189 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
190
191 return( 0 );
192 }
193
194 /*
195 * RSASSA-PSS-params ::= SEQUENCE {
196 * hashAlgorithm [0] HashAlgorithm DEFAULT sha1Identifier,
197 * maskGenAlgorithm [1] MaskGenAlgorithm DEFAULT mgf1SHA1Identifier,
198 * saltLength [2] INTEGER DEFAULT 20,
199 * trailerField [3] INTEGER DEFAULT 1 }
200 * -- Note that the tags in this Sequence are explicit.
201 *
202 * RFC 4055 (which defines use of RSASSA-PSS in PKIX) states that the value
203 * of trailerField MUST be 1, and PKCS#1 v2.2 doesn't even define any other
204 * option. Enfore this at parsing time.
205 */
206 int mbedtls_x509_get_rsassa_pss_params( const mbedtls_x509_buf *params,
207 mbedtls_md_type_t *md_alg, mbedtls_md_type_t *mgf_md,
208 int *salt_len )
209 {
210 int ret;
211 unsigned char *p;
212 const unsigned char *end, *end2;
213 size_t len;
214 mbedtls_x509_buf alg_id, alg_params;
215
216 /* First set everything to defaults */
217 *md_alg = MBEDTLS_MD_SHA1;
218 *mgf_md = MBEDTLS_MD_SHA1;
219 *salt_len = 20;
220
221 /* Make sure params is a SEQUENCE and setup bounds */
222 if( params->tag != ( MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) )
223 return( MBEDTLS_ERR_X509_INVALID_ALG +
224 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
225
226 p = (unsigned char *) params->p;
227 end = p + params->len;
228
229 if( p == end )
230 return( 0 );
231
232 /*
233 * HashAlgorithm
234 */
235 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
236 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) == 0 )
237 {
238 end2 = p + len;
239
240 /* HashAlgorithm ::= AlgorithmIdentifier (without parameters) */
241 if( ( ret = mbedtls_x509_get_alg_null( &p, end2, &alg_id ) ) != 0 )
242 return( ret );
243
244 if( ( ret = mbedtls_oid_get_md_alg( &alg_id, md_alg ) ) != 0 )
245 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
246
247 if( p != end2 )
248 return( MBEDTLS_ERR_X509_INVALID_ALG +
249 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
250 }
251 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
252 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
253
254 if( p == end )
255 return( 0 );
256
257 /*
258 * MaskGenAlgorithm
259 */
260 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
261 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 1 ) ) == 0 )
262 {
263 end2 = p + len;
264
265 /* MaskGenAlgorithm ::= AlgorithmIdentifier (params = HashAlgorithm) */
266 if( ( ret = mbedtls_x509_get_alg( &p, end2, &alg_id, &alg_params ) ) != 0 )
267 return( ret );
268
269 /* Only MFG1 is recognised for now */
270 if( MBEDTLS_OID_CMP( MBEDTLS_OID_MGF1, &alg_id ) != 0 )
271 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE +
272 MBEDTLS_ERR_OID_NOT_FOUND );
273
274 /* Parse HashAlgorithm */
275 if( ( ret = x509_get_hash_alg( &alg_params, mgf_md ) ) != 0 )
276 return( ret );
277
278 if( p != end2 )
279 return( MBEDTLS_ERR_X509_INVALID_ALG +
280 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
281 }
282 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
283 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
284
285 if( p == end )
286 return( 0 );
287
288 /*
289 * salt_len
290 */
291 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
292 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 2 ) ) == 0 )
293 {
294 end2 = p + len;
295
296 if( ( ret = mbedtls_asn1_get_int( &p, end2, salt_len ) ) != 0 )
297 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
298
299 if( p != end2 )
300 return( MBEDTLS_ERR_X509_INVALID_ALG +
301 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
302 }
303 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
304 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
305
306 if( p == end )
307 return( 0 );
308
309 /*
310 * trailer_field (if present, must be 1)
311 */
312 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
313 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 3 ) ) == 0 )
314 {
315 int trailer_field;
316
317 end2 = p + len;
318
319 if( ( ret = mbedtls_asn1_get_int( &p, end2, &trailer_field ) ) != 0 )
320 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
321
322 if( p != end2 )
323 return( MBEDTLS_ERR_X509_INVALID_ALG +
324 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
325
326 if( trailer_field != 1 )
327 return( MBEDTLS_ERR_X509_INVALID_ALG );
328 }
329 else if( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
330 return( MBEDTLS_ERR_X509_INVALID_ALG + ret );
331
332 if( p != end )
333 return( MBEDTLS_ERR_X509_INVALID_ALG +
334 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
335
336 return( 0 );
337 }
338 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
339
340 /*
341 * AttributeTypeAndValue ::= SEQUENCE {
342 * type AttributeType,
343 * value AttributeValue }
344 *
345 * AttributeType ::= OBJECT IDENTIFIER
346 *
347 * AttributeValue ::= ANY DEFINED BY AttributeType
348 */
349 static int x509_get_attr_type_value( unsigned char **p,
350 const unsigned char *end,
351 mbedtls_x509_name *cur )
352 {
353 int ret;
354 size_t len;
355 mbedtls_x509_buf *oid;
356 mbedtls_x509_buf *val;
357
358 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
359 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
360 return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
361
362 if( ( end - *p ) < 1 )
363 return( MBEDTLS_ERR_X509_INVALID_NAME +
364 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
365
366 oid = &cur->oid;
367 oid->tag = **p;
368
369 if( ( ret = mbedtls_asn1_get_tag( p, end, &oid->len, MBEDTLS_ASN1_OID ) ) != 0 )
370 return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
371
372 oid->p = *p;
373 *p += oid->len;
374
375 if( ( end - *p ) < 1 )
376 return( MBEDTLS_ERR_X509_INVALID_NAME +
377 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
378
379 if( **p != MBEDTLS_ASN1_BMP_STRING && **p != MBEDTLS_ASN1_UTF8_STRING &&
380 **p != MBEDTLS_ASN1_T61_STRING && **p != MBEDTLS_ASN1_PRINTABLE_STRING &&
381 **p != MBEDTLS_ASN1_IA5_STRING && **p != MBEDTLS_ASN1_UNIVERSAL_STRING &&
382 **p != MBEDTLS_ASN1_BIT_STRING )
383 return( MBEDTLS_ERR_X509_INVALID_NAME +
384 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
385
386 val = &cur->val;
387 val->tag = *(*p)++;
388
389 if( ( ret = mbedtls_asn1_get_len( p, end, &val->len ) ) != 0 )
390 return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
391
392 val->p = *p;
393 *p += val->len;
394
395 cur->next = NULL;
396
397 return( 0 );
398 }
399
400 /*
401 * Name ::= CHOICE { -- only one possibility for now --
402 * rdnSequence RDNSequence }
403 *
404 * RDNSequence ::= SEQUENCE OF RelativeDistinguishedName
405 *
406 * RelativeDistinguishedName ::=
407 * SET OF AttributeTypeAndValue
408 *
409 * AttributeTypeAndValue ::= SEQUENCE {
410 * type AttributeType,
411 * value AttributeValue }
412 *
413 * AttributeType ::= OBJECT IDENTIFIER
414 *
415 * AttributeValue ::= ANY DEFINED BY AttributeType
416 *
417 * The data structure is optimized for the common case where each RDN has only
418 * one element, which is represented as a list of AttributeTypeAndValue.
419 * For the general case we still use a flat list, but we mark elements of the
420 * same set so that they are "merged" together in the functions that consume
421 * this list, eg mbedtls_x509_dn_gets().
422 */
423 int mbedtls_x509_get_name( unsigned char **p, const unsigned char *end,
424 mbedtls_x509_name *cur )
425 {
426 int ret;
427 size_t set_len;
428 const unsigned char *end_set;
429
430 /* don't use recursion, we'd risk stack overflow if not optimized */
431 while( 1 )
432 {
433 /*
434 * parse SET
435 */
436 if( ( ret = mbedtls_asn1_get_tag( p, end, &set_len,
437 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET ) ) != 0 )
438 return( MBEDTLS_ERR_X509_INVALID_NAME + ret );
439
440 end_set = *p + set_len;
441
442 while( 1 )
443 {
444 if( ( ret = x509_get_attr_type_value( p, end_set, cur ) ) != 0 )
445 return( ret );
446
447 if( *p == end_set )
448 break;
449
450 /* Mark this item as being no the only one in a set */
451 cur->next_merged = 1;
452
453 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
454
455 if( cur->next == NULL )
456 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
457
458 cur = cur->next;
459 }
460
461 /*
462 * continue until end of SEQUENCE is reached
463 */
464 if( *p == end )
465 return( 0 );
466
467 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_name ) );
468
469 if( cur->next == NULL )
470 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
471
472 cur = cur->next;
473 }
474 }
475
476 static int x509_parse_int( unsigned char **p, size_t n, int *res )
477 {
478 *res = 0;
479
480 for( ; n > 0; --n )
481 {
482 if( ( **p < '0') || ( **p > '9' ) )
483 return ( MBEDTLS_ERR_X509_INVALID_DATE );
484
485 *res *= 10;
486 *res += ( *(*p)++ - '0' );
487 }
488
489 return( 0 );
490 }
491
492 static int x509_date_is_valid(const mbedtls_x509_time *t )
493 {
494 int ret = MBEDTLS_ERR_X509_INVALID_DATE;
495 int month_len;
496
497 CHECK_RANGE( 0, 9999, t->year );
498 CHECK_RANGE( 0, 23, t->hour );
499 CHECK_RANGE( 0, 59, t->min );
500 CHECK_RANGE( 0, 59, t->sec );
501
502 switch( t->mon )
503 {
504 case 1: case 3: case 5: case 7: case 8: case 10: case 12:
505 month_len = 31;
506 break;
507 case 4: case 6: case 9: case 11:
508 month_len = 30;
509 break;
510 case 2:
511 if( ( !( t->year % 4 ) && t->year % 100 ) ||
512 !( t->year % 400 ) )
513 month_len = 29;
514 else
515 month_len = 28;
516 break;
517 default:
518 return( ret );
519 }
520 CHECK_RANGE( 1, month_len, t->day );
521
522 return( 0 );
523 }
524
525 /*
526 * Parse an ASN1_UTC_TIME (yearlen=2) or ASN1_GENERALIZED_TIME (yearlen=4)
527 * field.
528 */
529 static int x509_parse_time( unsigned char **p, size_t len, size_t yearlen,
530 mbedtls_x509_time *tm )
531 {
532 int ret;
533
534 /*
535 * Minimum length is 10 or 12 depending on yearlen
536 */
537 if ( len < yearlen + 8 )
538 return ( MBEDTLS_ERR_X509_INVALID_DATE );
539 len -= yearlen + 8;
540
541 /*
542 * Parse year, month, day, hour, minute
543 */
544 CHECK( x509_parse_int( p, yearlen, &tm->year ) );
545 if ( 2 == yearlen )
546 {
547 if ( tm->year < 50 )
548 tm->year += 100;
549
550 tm->year += 1900;
551 }
552
553 CHECK( x509_parse_int( p, 2, &tm->mon ) );
554 CHECK( x509_parse_int( p, 2, &tm->day ) );
555 CHECK( x509_parse_int( p, 2, &tm->hour ) );
556 CHECK( x509_parse_int( p, 2, &tm->min ) );
557
558 /*
559 * Parse seconds if present
560 */
561 if ( len >= 2 )
562 {
563 CHECK( x509_parse_int( p, 2, &tm->sec ) );
564 len -= 2;
565 }
566 else
567 return ( MBEDTLS_ERR_X509_INVALID_DATE );
568
569 /*
570 * Parse trailing 'Z' if present
571 */
572 if ( 1 == len && 'Z' == **p )
573 {
574 (*p)++;
575 len--;
576 }
577
578 /*
579 * We should have parsed all characters at this point
580 */
581 if ( 0 != len )
582 return ( MBEDTLS_ERR_X509_INVALID_DATE );
583
584 CHECK( x509_date_is_valid( tm ) );
585
586 return ( 0 );
587 }
588
589 /*
590 * Time ::= CHOICE {
591 * utcTime UTCTime,
592 * generalTime GeneralizedTime }
593 */
594 int mbedtls_x509_get_time( unsigned char **p, const unsigned char *end,
595 mbedtls_x509_time *tm )
596 {
597 int ret;
598 size_t len, year_len;
599 unsigned char tag;
600
601 if( ( end - *p ) < 1 )
602 return( MBEDTLS_ERR_X509_INVALID_DATE +
603 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
604
605 tag = **p;
606
607 if( tag == MBEDTLS_ASN1_UTC_TIME )
608 year_len = 2;
609 else if( tag == MBEDTLS_ASN1_GENERALIZED_TIME )
610 year_len = 4;
611 else
612 return( MBEDTLS_ERR_X509_INVALID_DATE +
613 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
614
615 (*p)++;
616 ret = mbedtls_asn1_get_len( p, end, &len );
617
618 if( ret != 0 )
619 return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
620
621 return x509_parse_time( p, len, year_len, tm );
622 }
623
624 int mbedtls_x509_get_sig( unsigned char **p, const unsigned char *end, mbedtls_x509_buf *sig )
625 {
626 int ret;
627 size_t len;
628 int tag_type;
629
630 if( ( end - *p ) < 1 )
631 return( MBEDTLS_ERR_X509_INVALID_SIGNATURE +
632 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
633
634 tag_type = **p;
635
636 if( ( ret = mbedtls_asn1_get_bitstring_null( p, end, &len ) ) != 0 )
637 return( MBEDTLS_ERR_X509_INVALID_SIGNATURE + ret );
638
639 sig->tag = tag_type;
640 sig->len = len;
641 sig->p = *p;
642
643 *p += len;
644
645 return( 0 );
646 }
647
648 /*
649 * Get signature algorithm from alg OID and optional parameters
650 */
651 int mbedtls_x509_get_sig_alg( const mbedtls_x509_buf *sig_oid, const mbedtls_x509_buf *sig_params,
652 mbedtls_md_type_t *md_alg, mbedtls_pk_type_t *pk_alg,
653 void **sig_opts )
654 {
655 int ret;
656
657 if( *sig_opts != NULL )
658 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
659
660 if( ( ret = mbedtls_oid_get_sig_alg( sig_oid, md_alg, pk_alg ) ) != 0 )
661 return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + ret );
662
663 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
664 if( *pk_alg == MBEDTLS_PK_RSASSA_PSS )
665 {
666 mbedtls_pk_rsassa_pss_options *pss_opts;
667
668 pss_opts = mbedtls_calloc( 1, sizeof( mbedtls_pk_rsassa_pss_options ) );
669 if( pss_opts == NULL )
670 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
671
672 ret = mbedtls_x509_get_rsassa_pss_params( sig_params,
673 md_alg,
674 &pss_opts->mgf1_hash_id,
675 &pss_opts->expected_salt_len );
676 if( ret != 0 )
677 {
678 mbedtls_free( pss_opts );
679 return( ret );
680 }
681
682 *sig_opts = (void *) pss_opts;
683 }
684 else
685 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
686 {
687 /* Make sure parameters are absent or NULL */
688 if( ( sig_params->tag != MBEDTLS_ASN1_NULL && sig_params->tag != 0 ) ||
689 sig_params->len != 0 )
690 return( MBEDTLS_ERR_X509_INVALID_ALG );
691 }
692
693 return( 0 );
694 }
695
696 /*
697 * X.509 Extensions (No parsing of extensions, pointer should
698 * be either manually updated or extensions should be parsed!)
699 */
700 int mbedtls_x509_get_ext( unsigned char **p, const unsigned char *end,
701 mbedtls_x509_buf *ext, int tag )
702 {
703 int ret;
704 size_t len;
705
706 if( *p == end )
707 return( 0 );
708
709 ext->tag = **p;
710
711 if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
712 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | tag ) ) != 0 )
713 return( ret );
714
715 ext->p = *p;
716 end = *p + ext->len;
717
718 /*
719 * Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
720 *
721 * Extension ::= SEQUENCE {
722 * extnID OBJECT IDENTIFIER,
723 * critical BOOLEAN DEFAULT FALSE,
724 * extnValue OCTET STRING }
725 */
726 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
727 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
728 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
729
730 if( end != *p + len )
731 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
732 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
733
734 return( 0 );
735 }
736
737 /*
738 * Store the name in printable form into buf; no more
739 * than size characters will be written
740 */
741 int mbedtls_x509_dn_gets( char *buf, size_t size, const mbedtls_x509_name *dn )
742 {
743 int ret;
744 size_t i, n;
745 unsigned char c, merge = 0;
746 const mbedtls_x509_name *name;
747 const char *short_name = NULL;
748 char s[MBEDTLS_X509_MAX_DN_NAME_SIZE], *p;
749
750 memset( s, 0, sizeof( s ) );
751
752 name = dn;
753 p = buf;
754 n = size;
755
756 while( name != NULL )
757 {
758 if( !name->oid.p )
759 {
760 name = name->next;
761 continue;
762 }
763
764 if( name != dn )
765 {
766 ret = mbedtls_snprintf( p, n, merge ? " + " : ", " );
767 MBEDTLS_X509_SAFE_SNPRINTF;
768 }
769
770 ret = mbedtls_oid_get_attr_short_name( &name->oid, &short_name );
771
772 if( ret == 0 )
773 ret = mbedtls_snprintf( p, n, "%s=", short_name );
774 else
775 ret = mbedtls_snprintf( p, n, "\?\?=" );
776 MBEDTLS_X509_SAFE_SNPRINTF;
777
778 for( i = 0; i < name->val.len; i++ )
779 {
780 if( i >= sizeof( s ) - 1 )
781 break;
782
783 c = name->val.p[i];
784 if( c < 32 || c == 127 || ( c > 128 && c < 160 ) )
785 s[i] = '?';
786 else s[i] = c;
787 }
788 s[i] = '\0';
789 ret = mbedtls_snprintf( p, n, "%s", s );
790 MBEDTLS_X509_SAFE_SNPRINTF;
791
792 merge = name->next_merged;
793 name = name->next;
794 }
795
796 return( (int) ( size - n ) );
797 }
798
799 /*
800 * Store the serial in printable form into buf; no more
801 * than size characters will be written
802 */
803 int mbedtls_x509_serial_gets( char *buf, size_t size, const mbedtls_x509_buf *serial )
804 {
805 int ret;
806 size_t i, n, nr;
807 char *p;
808
809 p = buf;
810 n = size;
811
812 nr = ( serial->len <= 32 )
813 ? serial->len : 28;
814
815 for( i = 0; i < nr; i++ )
816 {
817 if( i == 0 && nr > 1 && serial->p[i] == 0x0 )
818 continue;
819
820 ret = mbedtls_snprintf( p, n, "%02X%s",
821 serial->p[i], ( i < nr - 1 ) ? ":" : "" );
822 MBEDTLS_X509_SAFE_SNPRINTF;
823 }
824
825 if( nr != serial->len )
826 {
827 ret = mbedtls_snprintf( p, n, "...." );
828 MBEDTLS_X509_SAFE_SNPRINTF;
829 }
830
831 return( (int) ( size - n ) );
832 }
833
834 /*
835 * Helper for writing signature algorithms
836 */
837 int mbedtls_x509_sig_alg_gets( char *buf, size_t size, const mbedtls_x509_buf *sig_oid,
838 mbedtls_pk_type_t pk_alg, mbedtls_md_type_t md_alg,
839 const void *sig_opts )
840 {
841 int ret;
842 char *p = buf;
843 size_t n = size;
844 const char *desc = NULL;
845
846 ret = mbedtls_oid_get_sig_alg_desc( sig_oid, &desc );
847 if( ret != 0 )
848 ret = mbedtls_snprintf( p, n, "???" );
849 else
850 ret = mbedtls_snprintf( p, n, "%s", desc );
851 MBEDTLS_X509_SAFE_SNPRINTF;
852
853 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
854 if( pk_alg == MBEDTLS_PK_RSASSA_PSS )
855 {
856 const mbedtls_pk_rsassa_pss_options *pss_opts;
857 const mbedtls_md_info_t *md_info, *mgf_md_info;
858
859 pss_opts = (const mbedtls_pk_rsassa_pss_options *) sig_opts;
860
861 md_info = mbedtls_md_info_from_type( md_alg );
862 mgf_md_info = mbedtls_md_info_from_type( pss_opts->mgf1_hash_id );
863
864 ret = mbedtls_snprintf( p, n, " (%s, MGF1-%s, 0x%02X)",
865 md_info ? mbedtls_md_get_name( md_info ) : "???",
866 mgf_md_info ? mbedtls_md_get_name( mgf_md_info ) : "???",
867 pss_opts->expected_salt_len );
868 MBEDTLS_X509_SAFE_SNPRINTF;
869 }
870 #else
871 ((void) pk_alg);
872 ((void) md_alg);
873 ((void) sig_opts);
874 #endif /* MBEDTLS_X509_RSASSA_PSS_SUPPORT */
875
876 return( (int)( size - n ) );
877 }
878
879 /*
880 * Helper for writing "RSA key size", "EC key size", etc
881 */
882 int mbedtls_x509_key_size_helper( char *buf, size_t buf_size, const char *name )
883 {
884 char *p = buf;
885 size_t n = buf_size;
886 int ret;
887
888 ret = mbedtls_snprintf( p, n, "%s key size", name );
889 MBEDTLS_X509_SAFE_SNPRINTF;
890
891 return( 0 );
892 }
893
894 #if defined(MBEDTLS_HAVE_TIME_DATE)
895 /*
896 * Set the time structure to the current time.
897 * Return 0 on success, non-zero on failure.
898 */
899 static int x509_get_current_time( mbedtls_x509_time *now )
900 {
901 struct tm *lt, tm_buf;
902 mbedtls_time_t tt;
903 int ret = 0;
904
905 tt = mbedtls_time( NULL );
906 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
907 lt = gmtime_s( &tm_buf, &tt ) == 0 ? &tm_buf : NULL;
908 #else
909 lt = gmtime_r( &tt, &tm_buf );
910 #endif
911
912 if( lt == NULL )
913 ret = -1;
914 else
915 {
916 now->year = lt->tm_year + 1900;
917 now->mon = lt->tm_mon + 1;
918 now->day = lt->tm_mday;
919 now->hour = lt->tm_hour;
920 now->min = lt->tm_min;
921 now->sec = lt->tm_sec;
922 }
923
924 return( ret );
925 }
926
927 /*
928 * Return 0 if before <= after, 1 otherwise
929 */
930 static int x509_check_time( const mbedtls_x509_time *before, const mbedtls_x509_time *after )
931 {
932 if( before->year > after->year )
933 return( 1 );
934
935 if( before->year == after->year &&
936 before->mon > after->mon )
937 return( 1 );
938
939 if( before->year == after->year &&
940 before->mon == after->mon &&
941 before->day > after->day )
942 return( 1 );
943
944 if( before->year == after->year &&
945 before->mon == after->mon &&
946 before->day == after->day &&
947 before->hour > after->hour )
948 return( 1 );
949
950 if( before->year == after->year &&
951 before->mon == after->mon &&
952 before->day == after->day &&
953 before->hour == after->hour &&
954 before->min > after->min )
955 return( 1 );
956
957 if( before->year == after->year &&
958 before->mon == after->mon &&
959 before->day == after->day &&
960 before->hour == after->hour &&
961 before->min == after->min &&
962 before->sec > after->sec )
963 return( 1 );
964
965 return( 0 );
966 }
967
968 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
969 {
970 mbedtls_x509_time now;
971
972 if( x509_get_current_time( &now ) != 0 )
973 return( 1 );
974
975 return( x509_check_time( &now, to ) );
976 }
977
978 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
979 {
980 mbedtls_x509_time now;
981
982 if( x509_get_current_time( &now ) != 0 )
983 return( 1 );
984
985 return( x509_check_time( from, &now ) );
986 }
987
988 #else /* MBEDTLS_HAVE_TIME_DATE */
989
990 int mbedtls_x509_time_is_past( const mbedtls_x509_time *to )
991 {
992 ((void) to);
993 return( 0 );
994 }
995
996 int mbedtls_x509_time_is_future( const mbedtls_x509_time *from )
997 {
998 ((void) from);
999 return( 0 );
1000 }
1001 #endif /* MBEDTLS_HAVE_TIME_DATE */
1002
1003 #if defined(MBEDTLS_SELF_TEST)
1004
1005 #include "mbedtls/x509_crt.h"
1006 #include "mbedtls/certs.h"
1007
1008 /*
1009 * Checkup routine
1010 */
1011 int mbedtls_x509_self_test( int verbose )
1012 {
1013 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_SHA256_C)
1014 int ret;
1015 uint32_t flags;
1016 mbedtls_x509_crt cacert;
1017 mbedtls_x509_crt clicert;
1018
1019 if( verbose != 0 )
1020 mbedtls_printf( " X.509 certificate load: " );
1021
1022 mbedtls_x509_crt_init( &clicert );
1023
1024 ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
1025 mbedtls_test_cli_crt_len );
1026 if( ret != 0 )
1027 {
1028 if( verbose != 0 )
1029 mbedtls_printf( "failed\n" );
1030
1031 return( ret );
1032 }
1033
1034 mbedtls_x509_crt_init( &cacert );
1035
1036 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_ca_crt,
1037 mbedtls_test_ca_crt_len );
1038 if( ret != 0 )
1039 {
1040 if( verbose != 0 )
1041 mbedtls_printf( "failed\n" );
1042
1043 return( ret );
1044 }
1045
1046 if( verbose != 0 )
1047 mbedtls_printf( "passed\n X.509 signature verify: ");
1048
1049 ret = mbedtls_x509_crt_verify( &clicert, &cacert, NULL, NULL, &flags, NULL, NULL );
1050 if( ret != 0 )
1051 {
1052 if( verbose != 0 )
1053 mbedtls_printf( "failed\n" );
1054
1055 return( ret );
1056 }
1057
1058 if( verbose != 0 )
1059 mbedtls_printf( "passed\n\n");
1060
1061 mbedtls_x509_crt_free( &cacert );
1062 mbedtls_x509_crt_free( &clicert );
1063
1064 return( 0 );
1065 #else
1066 ((void) verbose);
1067 return( 0 );
1068 #endif /* MBEDTLS_CERTS_C && MBEDTLS_SHA1_C */
1069 }
1070
1071 #endif /* MBEDTLS_SELF_TEST */
1072
1073 #endif /* MBEDTLS_X509_USE_C */
Proxmark3 GIT tracking
Impressum, Datenschutz