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5728c6aa MW |
1 | /* |
2 | * Copyright (C) 2010 Martin Willi | |
3 | * Copyright (C) 2010 revosec AG | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License as published by the | |
7 | * Free Software Foundation; either version 2 of the License, or (at your | |
8 | * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY | |
12 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
13 | * for more details. | |
14 | */ | |
15 | ||
16 | /* | |
17 | * Copyright (C) 2010 secunet Security Networks AG | |
18 | * Copyright (C) 2010 Thomas Egerer | |
19 | * | |
20 | * Permission is hereby granted, free of charge, to any person obtaining a copy | |
21 | * of this software and associated documentation files (the "Software"), to deal | |
22 | * in the Software without restriction, including without limitation the rights | |
23 | * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | |
24 | * copies of the Software, and to permit persons to whom the Software is | |
25 | * furnished to do so, subject to the following conditions: | |
26 | * | |
27 | * The above copyright notice and this permission notice shall be included in | |
28 | * all copies or substantial portions of the Software. | |
29 | * | |
30 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
31 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
32 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
33 | * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
34 | * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
35 | * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | |
36 | * THE SOFTWARE. | |
37 | */ | |
38 | ||
39 | #define _GNU_SOURCE | |
40 | #include <stdio.h> | |
41 | #include <openssl/x509.h> | |
42 | #include <openssl/x509v3.h> | |
43 | ||
44 | #include "openssl_x509.h" | |
45 | #include "openssl_util.h" | |
46 | ||
47 | #include <debug.h> | |
48 | #include <asn1/oid.h> | |
49 | #include <utils/linked_list.h> | |
50 | ||
51 | ||
52 | typedef struct private_openssl_x509_t private_openssl_x509_t; | |
53 | ||
54 | /** | |
55 | * Private data of an openssl_x509_t object. | |
56 | */ | |
57 | struct private_openssl_x509_t { | |
58 | ||
59 | /** | |
60 | * Public openssl_x509_t interface. | |
61 | */ | |
62 | openssl_x509_t public; | |
63 | ||
64 | /** | |
65 | * OpenSSL certificate representation | |
66 | */ | |
67 | X509 *x509; | |
68 | ||
69 | /** | |
70 | * DER encoded certificate | |
71 | */ | |
72 | chunk_t encoding; | |
73 | ||
74 | /** | |
75 | * SHA1 hash of the certificate | |
76 | */ | |
77 | chunk_t hash; | |
78 | ||
79 | /** | |
80 | * X509 flags | |
81 | */ | |
82 | x509_flag_t flags; | |
83 | ||
84 | /** | |
85 | * Pathlen constraint | |
86 | */ | |
87 | int pathlen; | |
88 | ||
89 | /** | |
90 | * certificate subject | |
91 | */ | |
92 | identification_t *subject; | |
93 | ||
94 | /** | |
95 | * certificate issuer | |
96 | */ | |
97 | identification_t *issuer; | |
98 | ||
99 | /** | |
100 | * Certificates public key | |
101 | */ | |
102 | public_key_t *pubkey; | |
103 | ||
104 | /** | |
105 | * subjectKeyIdentifier as read from cert | |
106 | */ | |
107 | chunk_t subjectKeyIdentifier; | |
108 | ||
109 | /** | |
110 | * authorityKeyIdentifier as read from cert | |
111 | */ | |
112 | chunk_t authKeyIdentifier; | |
113 | ||
114 | /** | |
115 | * Start time of certificate validity | |
116 | */ | |
117 | time_t notBefore; | |
118 | ||
119 | /** | |
120 | * End time of certificate validity | |
121 | */ | |
122 | time_t notAfter; | |
123 | ||
124 | /** | |
125 | * Signature scheme of the certificate | |
126 | */ | |
127 | signature_scheme_t scheme; | |
128 | ||
129 | /** | |
130 | * subjectAltNames | |
131 | */ | |
132 | linked_list_t *subjectAltNames; | |
133 | ||
134 | /** | |
135 | * issuerAltNames | |
136 | */ | |
137 | linked_list_t *issuerAltNames; | |
138 | ||
139 | /** | |
4e508517 | 140 | * List of CRL URIs, as crl_uri_t |
5728c6aa MW |
141 | */ |
142 | linked_list_t *crl_uris; | |
143 | ||
144 | /** | |
145 | * List of OCSP URIs | |
146 | */ | |
147 | linked_list_t *ocsp_uris; | |
148 | ||
149 | /** | |
150 | * References to this cert | |
151 | */ | |
152 | refcount_t ref; | |
153 | }; | |
154 | ||
4e508517 MW |
155 | /** |
156 | * CRL URIs with associated issuer | |
157 | */ | |
158 | typedef struct { | |
159 | identification_t *issuer; | |
160 | linked_list_t *uris; | |
161 | } crl_uri_t; | |
162 | ||
163 | /** | |
164 | * Create a new issuer entry | |
165 | */ | |
166 | static crl_uri_t *crl_uri_create() | |
167 | { | |
168 | crl_uri_t *this; | |
169 | ||
170 | INIT(this, | |
171 | .uris = linked_list_create(), | |
172 | ); | |
173 | return this; | |
174 | } | |
175 | ||
176 | /** | |
177 | * Destroy a CRL URI struct | |
178 | */ | |
179 | static void crl_uri_destroy(crl_uri_t *this) | |
180 | { | |
181 | this->uris->destroy_function(this->uris, free); | |
182 | DESTROY_IF(this->issuer); | |
183 | free(this); | |
184 | } | |
185 | ||
5728c6aa MW |
186 | /** |
187 | * Convert a GeneralName to an identification_t. | |
188 | */ | |
189 | static identification_t *general_name2id(GENERAL_NAME *name) | |
190 | { | |
191 | if (!name) | |
192 | { | |
193 | return NULL; | |
194 | } | |
195 | switch (name->type) | |
196 | { | |
197 | case GEN_EMAIL: | |
198 | return identification_create_from_encoding(ID_RFC822_ADDR, | |
199 | openssl_asn1_str2chunk(name->d.rfc822Name)); | |
200 | case GEN_DNS: | |
201 | return identification_create_from_encoding(ID_FQDN, | |
202 | openssl_asn1_str2chunk(name->d.dNSName)); | |
203 | case GEN_URI: | |
204 | return identification_create_from_encoding(ID_DER_ASN1_GN_URI, | |
205 | openssl_asn1_str2chunk(name->d.uniformResourceIdentifier)); | |
206 | case GEN_IPADD: | |
07c5aacc MW |
207 | { |
208 | chunk_t chunk = openssl_asn1_str2chunk(name->d.iPAddress); | |
209 | if (chunk.len == 4) | |
210 | { | |
211 | return identification_create_from_encoding(ID_IPV4_ADDR, chunk); | |
212 | } | |
213 | if (chunk.len == 16) | |
214 | { | |
215 | return identification_create_from_encoding(ID_IPV6_ADDR, chunk); | |
216 | } | |
217 | return NULL; | |
218 | } | |
5728c6aa MW |
219 | case GEN_DIRNAME : |
220 | return openssl_x509_name2id(name->d.directoryName); | |
a0a8aaaf MW |
221 | case GEN_OTHERNAME: |
222 | if (OBJ_obj2nid(name->d.otherName->type_id) == NID_ms_upn && | |
223 | name->d.otherName->value->type == V_ASN1_UTF8STRING) | |
224 | { | |
225 | return identification_create_from_encoding(ID_RFC822_ADDR, | |
226 | openssl_asn1_str2chunk( | |
227 | name->d.otherName->value->value.utf8string)); | |
228 | } | |
229 | return NULL; | |
5728c6aa MW |
230 | default: |
231 | return NULL; | |
232 | } | |
233 | } | |
234 | ||
235 | METHOD(x509_t, get_flags, x509_flag_t, | |
236 | private_openssl_x509_t *this) | |
237 | { | |
238 | return this->flags; | |
239 | } | |
240 | ||
241 | METHOD(x509_t, get_serial, chunk_t, | |
242 | private_openssl_x509_t *this) | |
243 | { | |
244 | return openssl_asn1_str2chunk(X509_get_serialNumber(this->x509)); | |
245 | } | |
246 | ||
247 | METHOD(x509_t, get_subjectKeyIdentifier, chunk_t, | |
248 | private_openssl_x509_t *this) | |
249 | { | |
250 | chunk_t fingerprint; | |
251 | ||
252 | if (this->subjectKeyIdentifier.len) | |
253 | { | |
254 | return this->subjectKeyIdentifier; | |
255 | } | |
da9724e6 | 256 | if (this->pubkey->get_fingerprint(this->pubkey, KEYID_PUBKEY_SHA1, |
5728c6aa MW |
257 | &fingerprint)) |
258 | { | |
259 | return fingerprint; | |
260 | } | |
261 | return chunk_empty; | |
262 | } | |
263 | ||
264 | METHOD(x509_t, get_authKeyIdentifier, chunk_t, | |
265 | private_openssl_x509_t *this) | |
266 | { | |
267 | if (this->authKeyIdentifier.len) | |
268 | { | |
269 | return this->authKeyIdentifier; | |
270 | } | |
271 | return chunk_empty; | |
272 | } | |
273 | ||
274 | METHOD(x509_t, get_pathLenConstraint, int, | |
275 | private_openssl_x509_t *this) | |
276 | { | |
277 | return this->pathlen; | |
278 | } | |
279 | ||
280 | METHOD(x509_t, create_subjectAltName_enumerator, enumerator_t*, | |
281 | private_openssl_x509_t *this) | |
282 | { | |
283 | return this->subjectAltNames->create_enumerator(this->subjectAltNames); | |
284 | } | |
285 | ||
4e508517 MW |
286 | /** |
287 | * Convert enumerator value from entry to (uri, issuer) | |
288 | */ | |
289 | static bool crl_enum_filter(identification_t *issuer_in, | |
290 | char **uri_in, char **uri_out, | |
291 | void *none_in, identification_t **issuer_out) | |
292 | { | |
293 | *uri_out = *uri_in; | |
294 | if (issuer_out) | |
295 | { | |
296 | *issuer_out = issuer_in; | |
297 | } | |
298 | return TRUE; | |
299 | } | |
300 | ||
301 | /** | |
302 | * Create inner enumerator over URIs | |
303 | */ | |
304 | static enumerator_t *crl_enum_create(crl_uri_t *entry) | |
305 | { | |
306 | return enumerator_create_filter(entry->uris->create_enumerator(entry->uris), | |
307 | (void*)crl_enum_filter, entry->issuer, NULL); | |
308 | } | |
309 | ||
5728c6aa MW |
310 | METHOD(x509_t, create_crl_uri_enumerator, enumerator_t*, |
311 | private_openssl_x509_t *this) | |
312 | { | |
4e508517 MW |
313 | return enumerator_create_nested( |
314 | this->crl_uris->create_enumerator(this->crl_uris), | |
315 | (void*)crl_enum_create, NULL, NULL); | |
5728c6aa MW |
316 | } |
317 | ||
318 | METHOD(x509_t, create_ocsp_uri_enumerator, enumerator_t*, | |
319 | private_openssl_x509_t *this) | |
320 | { | |
321 | return this->ocsp_uris->create_enumerator(this->ocsp_uris); | |
322 | } | |
323 | ||
5728c6aa MW |
324 | METHOD(certificate_t, get_type, certificate_type_t, |
325 | private_openssl_x509_t *this) | |
326 | { | |
327 | return CERT_X509; | |
328 | } | |
329 | ||
330 | METHOD(certificate_t, get_subject, identification_t*, | |
331 | private_openssl_x509_t *this) | |
332 | { | |
333 | return this->subject; | |
334 | } | |
335 | ||
336 | METHOD(certificate_t, get_issuer, identification_t*, | |
337 | private_openssl_x509_t *this) | |
338 | { | |
339 | return this->issuer; | |
340 | } | |
341 | ||
342 | METHOD(certificate_t, has_subject, id_match_t, | |
343 | private_openssl_x509_t *this, identification_t *subject) | |
344 | { | |
345 | identification_t *current; | |
346 | enumerator_t *enumerator; | |
347 | id_match_t match, best; | |
663e7355 | 348 | chunk_t encoding; |
5728c6aa MW |
349 | |
350 | if (subject->get_type(subject) == ID_KEY_ID) | |
351 | { | |
663e7355 MW |
352 | encoding = subject->get_encoding(subject); |
353 | ||
354 | if (chunk_equals(this->hash, encoding)) | |
355 | { | |
356 | return ID_MATCH_PERFECT; | |
357 | } | |
358 | if (this->subjectKeyIdentifier.len && | |
359 | chunk_equals(this->subjectKeyIdentifier, encoding)) | |
360 | { | |
361 | return ID_MATCH_PERFECT; | |
362 | } | |
363 | if (this->pubkey && | |
364 | this->pubkey->has_fingerprint(this->pubkey, encoding)) | |
5728c6aa MW |
365 | { |
366 | return ID_MATCH_PERFECT; | |
367 | } | |
368 | } | |
369 | best = this->subject->matches(this->subject, subject); | |
370 | enumerator = create_subjectAltName_enumerator(this); | |
371 | while (enumerator->enumerate(enumerator, ¤t)) | |
372 | { | |
373 | match = current->matches(current, subject); | |
374 | if (match > best) | |
375 | { | |
376 | best = match; | |
377 | } | |
378 | } | |
379 | enumerator->destroy(enumerator); | |
380 | return best; | |
381 | } | |
382 | ||
383 | METHOD(certificate_t, has_issuer, id_match_t, | |
384 | private_openssl_x509_t *this, identification_t *issuer) | |
385 | { | |
386 | /* issuerAltNames currently not supported */ | |
387 | return this->issuer->matches(this->issuer, issuer); | |
388 | } | |
389 | ||
390 | METHOD(certificate_t, issued_by, bool, | |
391 | private_openssl_x509_t *this, certificate_t *issuer) | |
392 | { | |
393 | public_key_t *key; | |
394 | bool valid; | |
395 | x509_t *x509 = (x509_t*)issuer; | |
396 | chunk_t tbs; | |
397 | ||
398 | if (&this->public.x509.interface == issuer) | |
399 | { | |
400 | if (this->flags & X509_SELF_SIGNED) | |
401 | { | |
402 | return TRUE; | |
403 | } | |
404 | } | |
405 | else | |
406 | { | |
407 | if (issuer->get_type(issuer) != CERT_X509) | |
408 | { | |
409 | return FALSE; | |
410 | } | |
411 | if (!(x509->get_flags(x509) & X509_CA)) | |
412 | { | |
413 | return FALSE; | |
414 | } | |
415 | if (!this->issuer->equals(this->issuer, issuer->get_subject(issuer))) | |
416 | { | |
417 | return FALSE; | |
418 | } | |
419 | } | |
420 | if (this->scheme == SIGN_UNKNOWN) | |
421 | { | |
422 | return FALSE; | |
423 | } | |
424 | key = issuer->get_public_key(issuer); | |
425 | if (!key) | |
426 | { | |
427 | return FALSE; | |
428 | } | |
429 | tbs = openssl_i2chunk(X509_CINF, this->x509->cert_info); | |
430 | valid = key->verify(key, this->scheme, tbs, | |
431 | openssl_asn1_str2chunk(this->x509->signature)); | |
432 | free(tbs.ptr); | |
433 | key->destroy(key); | |
434 | return valid; | |
435 | } | |
436 | ||
437 | METHOD(certificate_t, get_public_key, public_key_t*, | |
438 | private_openssl_x509_t *this) | |
439 | { | |
440 | return this->pubkey->get_ref(this->pubkey); | |
441 | } | |
442 | ||
443 | METHOD(certificate_t, get_validity, bool, | |
444 | private_openssl_x509_t *this, | |
445 | time_t *when, time_t *not_before, time_t *not_after) | |
446 | { | |
447 | time_t t; | |
448 | ||
449 | if (when) | |
450 | { | |
451 | t = *when; | |
452 | } | |
453 | else | |
454 | { | |
455 | t = time(NULL); | |
456 | } | |
457 | if (not_before) | |
458 | { | |
459 | *not_before = this->notBefore; | |
460 | } | |
461 | if (not_after) | |
462 | { | |
463 | *not_after = this->notAfter; | |
464 | } | |
465 | return (t >= this->notBefore && t <= this->notAfter); | |
466 | } | |
467 | ||
0406eeaa MW |
468 | METHOD(certificate_t, get_encoding, bool, |
469 | private_openssl_x509_t *this, cred_encoding_type_t type, chunk_t *encoding) | |
5728c6aa | 470 | { |
0406eeaa MW |
471 | if (type == CERT_ASN1_DER) |
472 | { | |
473 | *encoding = chunk_clone(this->encoding); | |
474 | return TRUE; | |
475 | } | |
476 | return lib->encoding->encode(lib->encoding, type, NULL, encoding, | |
477 | CRED_PART_X509_ASN1_DER, this->encoding, CRED_PART_END); | |
5728c6aa MW |
478 | } |
479 | ||
0406eeaa | 480 | |
5728c6aa MW |
481 | METHOD(certificate_t, equals, bool, |
482 | private_openssl_x509_t *this, certificate_t *other) | |
483 | { | |
484 | chunk_t encoding; | |
485 | bool equal; | |
486 | ||
487 | if (this == (private_openssl_x509_t*)other) | |
488 | { | |
489 | return TRUE; | |
490 | } | |
491 | if (other->get_type(other) != CERT_X509) | |
492 | { | |
493 | return FALSE; | |
494 | } | |
495 | if (other->equals == (void*)equals) | |
496 | { /* skip allocation if we have the same implementation */ | |
497 | encoding = ((private_openssl_x509_t*)other)->encoding; | |
498 | return chunk_equals(this->encoding, encoding); | |
499 | } | |
0406eeaa MW |
500 | if (!other->get_encoding(other, CERT_ASN1_DER, &encoding)) |
501 | { | |
502 | return FALSE; | |
503 | } | |
5728c6aa MW |
504 | equal = chunk_equals(this->encoding, encoding); |
505 | free(encoding.ptr); | |
506 | return equal; | |
507 | } | |
508 | ||
509 | METHOD(certificate_t, get_ref, certificate_t*, | |
510 | private_openssl_x509_t *this) | |
511 | { | |
512 | ref_get(&this->ref); | |
513 | return &this->public.x509.interface; | |
514 | } | |
515 | ||
516 | METHOD(certificate_t, destroy, void, | |
517 | private_openssl_x509_t *this) | |
518 | { | |
519 | if (ref_put(&this->ref)) | |
520 | { | |
521 | if (this->x509) | |
522 | { | |
523 | X509_free(this->x509); | |
524 | } | |
525 | DESTROY_IF(this->subject); | |
526 | DESTROY_IF(this->issuer); | |
527 | DESTROY_IF(this->pubkey); | |
528 | free(this->subjectKeyIdentifier.ptr); | |
529 | free(this->authKeyIdentifier.ptr); | |
530 | free(this->encoding.ptr); | |
531 | free(this->hash.ptr); | |
532 | this->subjectAltNames->destroy_offset(this->subjectAltNames, | |
533 | offsetof(identification_t, destroy)); | |
534 | this->issuerAltNames->destroy_offset(this->issuerAltNames, | |
535 | offsetof(identification_t, destroy)); | |
4e508517 | 536 | this->crl_uris->destroy_function(this->crl_uris, (void*)crl_uri_destroy); |
5728c6aa MW |
537 | this->ocsp_uris->destroy_function(this->ocsp_uris, free); |
538 | free(this); | |
539 | } | |
540 | } | |
541 | ||
542 | /** | |
543 | * Create an empty certificate | |
544 | */ | |
545 | static private_openssl_x509_t *create_empty() | |
546 | { | |
547 | private_openssl_x509_t *this; | |
548 | ||
549 | INIT(this, | |
550 | .public = { | |
551 | .x509 = { | |
552 | .interface = { | |
553 | .get_type = _get_type, | |
554 | .get_subject = _get_subject, | |
555 | .get_issuer = _get_issuer, | |
556 | .has_subject = _has_subject, | |
557 | .has_issuer = _has_issuer, | |
558 | .issued_by = _issued_by, | |
559 | .get_public_key = _get_public_key, | |
560 | .get_validity = _get_validity, | |
5728c6aa MW |
561 | .get_encoding = _get_encoding, |
562 | .equals = _equals, | |
563 | .get_ref = _get_ref, | |
564 | .destroy = _destroy, | |
565 | }, | |
566 | .get_flags = _get_flags, | |
567 | .get_serial = _get_serial, | |
568 | .get_subjectKeyIdentifier = _get_subjectKeyIdentifier, | |
569 | .get_authKeyIdentifier = _get_authKeyIdentifier, | |
570 | .get_pathLenConstraint = _get_pathLenConstraint, | |
571 | .create_subjectAltName_enumerator = _create_subjectAltName_enumerator, | |
572 | .create_crl_uri_enumerator = _create_crl_uri_enumerator, | |
573 | .create_ocsp_uri_enumerator = _create_ocsp_uri_enumerator, | |
20bd7810 | 574 | .create_ipAddrBlock_enumerator = (void*)enumerator_create_empty, |
dbfbbec3 | 575 | .create_name_constraint_enumerator = (void*)enumerator_create_empty, |
20bd7810 | 576 | .create_cert_policy_enumerator = (void*)enumerator_create_empty, |
5a0caa4b | 577 | .create_policy_mapping_enumerator = (void*)enumerator_create_empty, |
5728c6aa MW |
578 | }, |
579 | }, | |
580 | .subjectAltNames = linked_list_create(), | |
581 | .issuerAltNames = linked_list_create(), | |
582 | .crl_uris = linked_list_create(), | |
583 | .ocsp_uris = linked_list_create(), | |
5dba5852 | 584 | .pathlen = X509_NO_CONSTRAINT, |
5728c6aa MW |
585 | .ref = 1, |
586 | ); | |
587 | ||
588 | return this; | |
589 | } | |
590 | ||
591 | /** | |
592 | * parse an extionsion containing GENERAL_NAMES into a list | |
593 | */ | |
594 | static bool parse_generalNames_ext(linked_list_t *list, | |
595 | X509_EXTENSION *ext) | |
596 | { | |
597 | GENERAL_NAMES *names; | |
598 | GENERAL_NAME *name; | |
599 | identification_t *id; | |
600 | int i, num; | |
601 | ||
602 | names = X509V3_EXT_d2i(ext); | |
603 | if (!names) | |
604 | { | |
605 | return FALSE; | |
606 | } | |
607 | ||
608 | num = sk_GENERAL_NAME_num(names); | |
609 | for (i = 0; i < num; i++) | |
610 | { | |
611 | name = sk_GENERAL_NAME_value(names, i); | |
612 | id = general_name2id(name); | |
613 | if (id) | |
614 | { | |
615 | list->insert_last(list, id); | |
616 | } | |
617 | GENERAL_NAME_free(name); | |
618 | } | |
619 | sk_GENERAL_NAME_free(names); | |
620 | return TRUE; | |
621 | } | |
622 | ||
623 | /** | |
624 | * parse basic constraints | |
625 | */ | |
626 | static bool parse_basicConstraints_ext(private_openssl_x509_t *this, | |
627 | X509_EXTENSION *ext) | |
628 | { | |
629 | BASIC_CONSTRAINTS *constraints; | |
630 | ||
631 | constraints = (BASIC_CONSTRAINTS*)X509V3_EXT_d2i(ext); | |
632 | if (constraints) | |
633 | { | |
634 | if (constraints->ca) | |
635 | { | |
636 | this->flags |= X509_CA; | |
637 | } | |
638 | if (constraints->pathlen) | |
639 | { | |
640 | this->pathlen = ASN1_INTEGER_get(constraints->pathlen); | |
641 | } | |
642 | BASIC_CONSTRAINTS_free(constraints); | |
643 | return TRUE; | |
644 | } | |
645 | return FALSE; | |
646 | } | |
647 | ||
648 | /** | |
649 | * Parse CRL distribution points | |
650 | */ | |
651 | static bool parse_crlDistributionPoints_ext(private_openssl_x509_t *this, | |
652 | X509_EXTENSION *ext) | |
653 | { | |
654 | CRL_DIST_POINTS *cdps; | |
655 | DIST_POINT *cdp; | |
656 | identification_t *id; | |
657 | char *uri; | |
658 | int i, j, point_num, name_num; | |
659 | ||
660 | cdps = X509V3_EXT_d2i(ext); | |
661 | if (!cdps) | |
662 | { | |
663 | return FALSE; | |
664 | } | |
665 | point_num = sk_DIST_POINT_num(cdps); | |
666 | for (i = 0; i < point_num; i++) | |
667 | { | |
668 | cdp = sk_DIST_POINT_value(cdps, i); | |
669 | if (cdp) | |
670 | { | |
4e508517 MW |
671 | crl_uri_t *entry; |
672 | ||
673 | entry = crl_uri_create(); | |
674 | this->crl_uris->insert_last(this->crl_uris, entry); | |
675 | ||
5728c6aa MW |
676 | if (cdp->distpoint && cdp->distpoint->type == 0 && |
677 | cdp->distpoint->name.fullname) | |
678 | { | |
679 | name_num = sk_GENERAL_NAME_num(cdp->distpoint->name.fullname); | |
680 | for (j = 0; j < name_num; j++) | |
681 | { | |
682 | id = general_name2id(sk_GENERAL_NAME_value( | |
683 | cdp->distpoint->name.fullname, j)); | |
684 | if (id) | |
685 | { | |
686 | if (asprintf(&uri, "%Y", id) > 0) | |
687 | { | |
4e508517 | 688 | entry->uris->insert_last(entry->uris, uri); |
5728c6aa MW |
689 | } |
690 | id->destroy(id); | |
691 | } | |
692 | } | |
693 | } | |
4e508517 MW |
694 | if (cdp->CRLissuer) |
695 | { | |
696 | name_num = sk_GENERAL_NAME_num(cdp->CRLissuer); | |
697 | for (j = 0; j < name_num; j++) | |
698 | { | |
699 | id = general_name2id(sk_GENERAL_NAME_value(cdp->CRLissuer, j)); | |
700 | if (id) | |
701 | { /* get only one */ | |
702 | entry->issuer = id; | |
703 | break; | |
704 | } | |
705 | } | |
706 | } | |
5728c6aa MW |
707 | DIST_POINT_free(cdp); |
708 | } | |
709 | } | |
710 | sk_DIST_POINT_free(cdps); | |
711 | return TRUE; | |
712 | } | |
713 | ||
714 | /** | |
715 | * Parse authorityInfoAccess with OCSP URIs | |
716 | */ | |
717 | static bool parse_authorityInfoAccess_ext(private_openssl_x509_t *this, | |
718 | X509_EXTENSION *ext) | |
719 | { | |
720 | AUTHORITY_INFO_ACCESS *infos; | |
721 | ACCESS_DESCRIPTION *desc; | |
722 | identification_t *id; | |
723 | int i, num; | |
724 | char *uri; | |
725 | ||
726 | infos = X509V3_EXT_d2i(ext); | |
727 | if (!infos) | |
728 | { | |
729 | return FALSE; | |
730 | } | |
731 | num = sk_ACCESS_DESCRIPTION_num(infos); | |
732 | for (i = 0; i < num; i++) | |
733 | { | |
734 | desc = sk_ACCESS_DESCRIPTION_value(infos, i); | |
735 | if (desc) | |
736 | { | |
737 | if (openssl_asn1_known_oid(desc->method) == OID_OCSP) | |
738 | { | |
739 | id = general_name2id(desc->location); | |
740 | if (id) | |
741 | { | |
742 | if (asprintf(&uri, "%Y", id) > 0) | |
743 | { | |
744 | this->ocsp_uris->insert_first(this->ocsp_uris, uri); | |
745 | } | |
746 | id->destroy(id); | |
747 | } | |
748 | } | |
749 | ACCESS_DESCRIPTION_free(desc); | |
750 | } | |
751 | } | |
752 | sk_ACCESS_DESCRIPTION_free(infos); | |
753 | return TRUE; | |
754 | } | |
755 | ||
756 | /** | |
757 | * Parse authorityKeyIdentifier extension | |
758 | */ | |
759 | static bool parse_authKeyIdentifier_ext(private_openssl_x509_t *this, | |
760 | X509_EXTENSION *ext) | |
761 | { | |
762 | AUTHORITY_KEYID *keyid; | |
763 | ||
764 | keyid = (AUTHORITY_KEYID*)X509V3_EXT_d2i(ext); | |
765 | if (keyid) | |
766 | { | |
767 | free(this->authKeyIdentifier.ptr); | |
768 | this->authKeyIdentifier = chunk_clone( | |
769 | openssl_asn1_str2chunk(keyid->keyid)); | |
770 | AUTHORITY_KEYID_free(keyid); | |
771 | return TRUE; | |
772 | } | |
773 | return FALSE; | |
774 | } | |
775 | ||
776 | /** | |
777 | * Parse subjectKeyIdentifier extension | |
778 | */ | |
779 | static bool parse_subjectKeyIdentifier_ext(private_openssl_x509_t *this, | |
780 | X509_EXTENSION *ext) | |
781 | { | |
f00a1015 MW |
782 | chunk_t ostr; |
783 | ||
784 | ostr = openssl_asn1_str2chunk(X509_EXTENSION_get_data(ext)); | |
785 | /* quick and dirty unwrap of octet string */ | |
786 | if (ostr.len > 2 && | |
787 | ostr.ptr[0] == V_ASN1_OCTET_STRING && ostr.ptr[1] == ostr.len - 2) | |
788 | { | |
789 | free(this->subjectKeyIdentifier.ptr); | |
790 | this->subjectKeyIdentifier = chunk_clone(chunk_skip(ostr, 2)); | |
791 | return TRUE; | |
792 | } | |
793 | return FALSE; | |
5728c6aa MW |
794 | } |
795 | ||
796 | /** | |
797 | * Parse X509 extensions we are interested in | |
798 | */ | |
799 | static bool parse_extensions(private_openssl_x509_t *this) | |
800 | { | |
801 | STACK_OF(X509_EXTENSION) *extensions; | |
802 | int i, num; | |
803 | ||
804 | extensions = this->x509->cert_info->extensions; | |
805 | if (extensions) | |
806 | { | |
807 | num = sk_X509_EXTENSION_num(extensions); | |
808 | ||
809 | for (i = 0; i < num; i++) | |
810 | { | |
811 | X509_EXTENSION *ext; | |
812 | bool ok; | |
813 | ||
814 | ext = sk_X509_EXTENSION_value(extensions, i); | |
815 | switch (OBJ_obj2nid(X509_EXTENSION_get_object(ext))) | |
816 | { | |
817 | case NID_info_access: | |
818 | ok = parse_authorityInfoAccess_ext(this, ext); | |
819 | break; | |
820 | case NID_authority_key_identifier: | |
821 | ok = parse_authKeyIdentifier_ext(this, ext); | |
822 | break; | |
823 | case NID_subject_key_identifier: | |
824 | ok = parse_subjectKeyIdentifier_ext(this, ext); | |
825 | break; | |
826 | case NID_subject_alt_name: | |
827 | ok = parse_generalNames_ext(this->subjectAltNames, ext); | |
828 | break; | |
829 | case NID_issuer_alt_name: | |
830 | ok = parse_generalNames_ext(this->issuerAltNames, ext); | |
831 | break; | |
832 | case NID_basic_constraints: | |
833 | ok = parse_basicConstraints_ext(this, ext); | |
834 | break; | |
835 | case NID_crl_distribution_points: | |
836 | ok = parse_crlDistributionPoints_ext(this, ext); | |
837 | break; | |
838 | default: | |
b0892d09 MW |
839 | ok = X509_EXTENSION_get_critical(ext) != 0; |
840 | if (!ok) | |
841 | { | |
842 | DBG1(DBG_LIB, "found unsupported critical X.509 extension"); | |
843 | } | |
5728c6aa MW |
844 | break; |
845 | } | |
846 | if (!ok) | |
847 | { | |
848 | return FALSE; | |
849 | } | |
850 | } | |
851 | } | |
852 | return TRUE; | |
853 | } | |
854 | ||
07d2b391 MW |
855 | /** |
856 | * Parse ExtendedKeyUsage | |
857 | */ | |
858 | static void parse_extKeyUsage(private_openssl_x509_t *this) | |
859 | { | |
860 | EXTENDED_KEY_USAGE *usage; | |
861 | int i; | |
862 | ||
863 | usage = X509_get_ext_d2i(this->x509, NID_ext_key_usage, NULL, NULL); | |
864 | if (usage) | |
865 | { | |
866 | for (i = 0; i < sk_ASN1_OBJECT_num(usage); i++) | |
867 | { | |
868 | switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(usage, i))) | |
869 | { | |
870 | case NID_server_auth: | |
871 | this->flags |= X509_SERVER_AUTH; | |
872 | break; | |
873 | case NID_client_auth: | |
874 | this->flags |= X509_CLIENT_AUTH; | |
875 | break; | |
876 | case NID_OCSP_sign: | |
877 | this->flags |= X509_OCSP_SIGNER; | |
878 | break; | |
879 | default: | |
880 | break; | |
881 | } | |
882 | } | |
883 | sk_ASN1_OBJECT_pop_free(usage, ASN1_OBJECT_free); | |
884 | } | |
885 | } | |
886 | ||
5728c6aa MW |
887 | /** |
888 | * Parse a DER encoded x509 certificate | |
889 | */ | |
890 | static bool parse_certificate(private_openssl_x509_t *this) | |
891 | { | |
892 | const unsigned char *ptr = this->encoding.ptr; | |
893 | hasher_t *hasher; | |
894 | chunk_t chunk; | |
895 | ||
896 | this->x509 = d2i_X509(NULL, &ptr, this->encoding.len); | |
897 | if (!this->x509) | |
898 | { | |
899 | return FALSE; | |
900 | } | |
a6850b84 MW |
901 | if (X509_get_version(this->x509) < 0 || X509_get_version(this->x509) > 2) |
902 | { | |
903 | DBG1(DBG_LIB, "unsupported x509 version: %d", | |
904 | X509_get_version(this->x509) + 1); | |
905 | return FALSE; | |
906 | } | |
907 | ||
5728c6aa MW |
908 | this->subject = openssl_x509_name2id(X509_get_subject_name(this->x509)); |
909 | this->issuer = openssl_x509_name2id(X509_get_issuer_name(this->x509)); | |
910 | ||
911 | switch (openssl_asn1_known_oid(this->x509->cert_info->key->algor->algorithm)) | |
912 | { | |
913 | case OID_RSA_ENCRYPTION: | |
914 | this->pubkey = lib->creds->create(lib->creds, | |
915 | CRED_PUBLIC_KEY, KEY_RSA, BUILD_BLOB_ASN1_DER, | |
916 | openssl_asn1_str2chunk(X509_get0_pubkey_bitstr(this->x509)), | |
917 | BUILD_END); | |
918 | break; | |
919 | case OID_EC_PUBLICKEY: | |
920 | /* for ECDSA, we need the full subjectPublicKeyInfo, as it contains | |
921 | * the curve parameters. */ | |
922 | chunk = openssl_i2chunk(X509_PUBKEY, X509_get_X509_PUBKEY(this->x509)); | |
923 | this->pubkey = lib->creds->create(lib->creds, | |
924 | CRED_PUBLIC_KEY, KEY_ECDSA, BUILD_BLOB_ASN1_DER, | |
925 | chunk, BUILD_END); | |
926 | free(chunk.ptr); | |
927 | break; | |
928 | default: | |
929 | DBG1(DBG_LIB, "unsupported public key algorithm"); | |
930 | break; | |
931 | } | |
932 | if (!this->subject || !this->issuer || !this->pubkey) | |
933 | { | |
934 | return FALSE; | |
935 | } | |
936 | ||
937 | this->notBefore = openssl_asn1_to_time(X509_get_notBefore(this->x509)); | |
938 | this->notAfter = openssl_asn1_to_time(X509_get_notAfter(this->x509)); | |
939 | ||
940 | if (!chunk_equals( | |
941 | openssl_asn1_obj2chunk(this->x509->cert_info->signature->algorithm), | |
942 | openssl_asn1_obj2chunk(this->x509->sig_alg->algorithm))) | |
943 | { | |
944 | return FALSE; | |
945 | } | |
946 | this->scheme = signature_scheme_from_oid(openssl_asn1_known_oid( | |
947 | this->x509->sig_alg->algorithm)); | |
948 | ||
949 | if (!parse_extensions(this)) | |
950 | { | |
951 | return TRUE; | |
952 | } | |
07d2b391 | 953 | parse_extKeyUsage(this); |
5728c6aa MW |
954 | |
955 | hasher = lib->crypto->create_hasher(lib->crypto, HASH_SHA1); | |
956 | if (!hasher) | |
957 | { | |
958 | return FALSE; | |
959 | } | |
960 | hasher->allocate_hash(hasher, this->encoding, &this->hash); | |
961 | hasher->destroy(hasher); | |
962 | ||
963 | if (issued_by(this, &this->public.x509.interface)) | |
964 | { | |
965 | this->flags |= X509_SELF_SIGNED; | |
966 | } | |
967 | return TRUE; | |
968 | } | |
969 | ||
970 | openssl_x509_t *openssl_x509_load(certificate_type_t type, va_list args) | |
971 | { | |
972 | chunk_t blob = chunk_empty; | |
973 | x509_flag_t flags = 0; | |
974 | ||
975 | while (TRUE) | |
976 | { | |
977 | switch (va_arg(args, builder_part_t)) | |
978 | { | |
979 | case BUILD_BLOB_ASN1_DER: | |
980 | blob = va_arg(args, chunk_t); | |
981 | continue; | |
982 | case BUILD_X509_FLAG: | |
983 | flags |= va_arg(args, x509_flag_t); | |
984 | continue; | |
985 | case BUILD_END: | |
986 | break; | |
987 | default: | |
988 | return NULL; | |
989 | } | |
990 | break; | |
991 | } | |
992 | ||
993 | if (blob.ptr) | |
994 | { | |
995 | private_openssl_x509_t *this; | |
996 | ||
997 | this = create_empty(); | |
998 | this->encoding = chunk_clone(blob); | |
999 | this->flags |= flags; | |
1000 | if (parse_certificate(this)) | |
1001 | { | |
1002 | return &this->public; | |
1003 | } | |
1004 | DBG1(DBG_LIB, "OpenSSL X.509 parsing failed"); | |
1005 | destroy(this); | |
1006 | } | |
1007 | return NULL; | |
1008 | } |