1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/asn1.h>
58#include <openssl/asn1t.h>
59#include <openssl/digest.h>
60#include <openssl/err.h>
61#include <openssl/mem.h>
62#include <openssl/obj.h>
63#include <openssl/stack.h>
64#include <openssl/thread.h>
65#include <openssl/x509.h>
66#include <openssl/x509v3.h>
67
68#include "../internal.h"
69
70/*
71 * Method to handle CRL access. In general a CRL could be very large (several
72 * Mb) and can consume large amounts of resources if stored in memory by
73 * multiple processes. This method allows general CRL operations to be
74 * redirected to more efficient callbacks: for example a CRL entry database.
75 */
76
77#define X509_CRL_METHOD_DYNAMIC 1
78
79struct x509_crl_method_st {
80 int flags;
81 int (*crl_init) (X509_CRL *crl);
82 int (*crl_free) (X509_CRL *crl);
83 int (*crl_lookup) (X509_CRL *crl, X509_REVOKED **ret,
84 ASN1_INTEGER *ser, X509_NAME *issuer);
85 int (*crl_verify) (X509_CRL *crl, EVP_PKEY *pk);
86};
87
88static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b);
89static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
90
91ASN1_SEQUENCE(X509_REVOKED) = {
92 ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
93 ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
94 ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
95} ASN1_SEQUENCE_END(X509_REVOKED)
96
97static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
98static int def_crl_lookup(X509_CRL *crl,
99 X509_REVOKED **ret, ASN1_INTEGER *serial,
100 X509_NAME *issuer);
101
102static const X509_CRL_METHOD int_crl_meth = {
103 0,
104 0, 0,
105 def_crl_lookup,
106 def_crl_verify
107};
108
109static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
110
111/*
112 * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
113 * the original encoding the signature wont be affected by reordering of the
114 * revoked field.
115 */
116static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
117 void *exarg)
118{
119 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
120
121 if (!a || !a->revoked)
122 return 1;
123 switch (operation) {
124 /*
125 * Just set cmp function here. We don't sort because that would
126 * affect the output of X509_CRL_print().
127 */
128 case ASN1_OP_D2I_POST:
129 (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
130 break;
131 }
132 return 1;
133}
134
135
136ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
137 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
138 ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
139 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
140 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
141 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
142 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
143 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
144} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
145
146/*
147 * Set CRL entry issuer according to CRL certificate issuer extension. Check
148 * for unhandled critical CRL entry extensions.
149 */
150
151static int crl_set_issuers(X509_CRL *crl)
152{
153
154 size_t i, k;
155 int j;
156 GENERAL_NAMES *gens, *gtmp;
157 STACK_OF(X509_REVOKED) *revoked;
158
159 revoked = X509_CRL_get_REVOKED(crl);
160
161 gens = NULL;
162 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
163 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
164 STACK_OF(X509_EXTENSION) *exts;
165 ASN1_ENUMERATED *reason;
166 X509_EXTENSION *ext;
167 gtmp = X509_REVOKED_get_ext_d2i(rev,
168 NID_certificate_issuer, &j, NULL);
169 if (!gtmp && (j != -1)) {
170 crl->flags |= EXFLAG_INVALID;
171 return 1;
172 }
173
174 if (gtmp) {
175 gens = gtmp;
176 if (!crl->issuers) {
177 crl->issuers = sk_GENERAL_NAMES_new_null();
178 if (!crl->issuers)
179 return 0;
180 }
181 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
182 return 0;
183 }
184 rev->issuer = gens;
185
186 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
187 if (!reason && (j != -1)) {
188 crl->flags |= EXFLAG_INVALID;
189 return 1;
190 }
191
192 if (reason) {
193 rev->reason = ASN1_ENUMERATED_get(reason);
194 ASN1_ENUMERATED_free(reason);
195 } else
196 rev->reason = CRL_REASON_NONE;
197
198 /* Check for critical CRL entry extensions */
199
200 exts = rev->extensions;
201
202 for (k = 0; k < sk_X509_EXTENSION_num(exts); k++) {
203 ext = sk_X509_EXTENSION_value(exts, k);
204 if (ext->critical > 0) {
205 if (OBJ_obj2nid(ext->object) == NID_certificate_issuer)
206 continue;
207 crl->flags |= EXFLAG_CRITICAL;
208 break;
209 }
210 }
211
212 }
213
214 return 1;
215
216}
217
218/*
219 * The X509_CRL structure needs a bit of customisation. Cache some extensions
220 * and hash of the whole CRL.
221 */
222static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
223 void *exarg)
224{
225 X509_CRL *crl = (X509_CRL *)*pval;
226 STACK_OF(X509_EXTENSION) *exts;
227 X509_EXTENSION *ext;
228 size_t idx;
229
230 switch (operation) {
231 case ASN1_OP_NEW_POST:
232 crl->idp = NULL;
233 crl->akid = NULL;
234 crl->flags = 0;
235 crl->idp_flags = 0;
236 crl->idp_reasons = CRLDP_ALL_REASONS;
237 crl->meth = default_crl_method;
238 crl->meth_data = NULL;
239 crl->issuers = NULL;
240 crl->crl_number = NULL;
241 crl->base_crl_number = NULL;
242 break;
243
244 case ASN1_OP_D2I_POST:
245 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
246 crl->idp = X509_CRL_get_ext_d2i(crl,
247 NID_issuing_distribution_point, NULL,
248 NULL);
249 if (crl->idp)
250 setup_idp(crl, crl->idp);
251
252 crl->akid = X509_CRL_get_ext_d2i(crl,
253 NID_authority_key_identifier, NULL,
254 NULL);
255
256 crl->crl_number = X509_CRL_get_ext_d2i(crl,
257 NID_crl_number, NULL, NULL);
258
259 crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
260 NID_delta_crl, NULL,
261 NULL);
262 /* Delta CRLs must have CRL number */
263 if (crl->base_crl_number && !crl->crl_number)
264 crl->flags |= EXFLAG_INVALID;
265
266 /*
267 * See if we have any unhandled critical CRL extensions and indicate
268 * this in a flag. We only currently handle IDP so anything else
269 * critical sets the flag. This code accesses the X509_CRL structure
270 * directly: applications shouldn't do this.
271 */
272
273 exts = crl->crl->extensions;
274
275 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
276 int nid;
277 ext = sk_X509_EXTENSION_value(exts, idx);
278 nid = OBJ_obj2nid(ext->object);
279 if (nid == NID_freshest_crl)
280 crl->flags |= EXFLAG_FRESHEST;
281 if (ext->critical > 0) {
282 /* We handle IDP and deltas */
283 if ((nid == NID_issuing_distribution_point)
284 || (nid == NID_authority_key_identifier)
285 || (nid == NID_delta_crl))
286 continue;
287 crl->flags |= EXFLAG_CRITICAL;
288 break;
289 }
290 }
291
292 if (!crl_set_issuers(crl))
293 return 0;
294
295 if (crl->meth->crl_init) {
296 if (crl->meth->crl_init(crl) == 0)
297 return 0;
298 }
299 break;
300
301 case ASN1_OP_FREE_POST:
302 /* |crl->meth| may be NULL if constructing the object failed before
303 * |ASN1_OP_NEW_POST| was run. */
304 if (crl->meth && crl->meth->crl_free) {
305 if (!crl->meth->crl_free(crl))
306 return 0;
307 }
308 if (crl->akid)
309 AUTHORITY_KEYID_free(crl->akid);
310 if (crl->idp)
311 ISSUING_DIST_POINT_free(crl->idp);
312 ASN1_INTEGER_free(crl->crl_number);
313 ASN1_INTEGER_free(crl->base_crl_number);
314 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
315 break;
316 }
317 return 1;
318}
319
320/* Convert IDP into a more convenient form */
321
322static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
323{
324 int idp_only = 0;
325 /* Set various flags according to IDP */
326 crl->idp_flags |= IDP_PRESENT;
327 if (idp->onlyuser > 0) {
328 idp_only++;
329 crl->idp_flags |= IDP_ONLYUSER;
330 }
331 if (idp->onlyCA > 0) {
332 idp_only++;
333 crl->idp_flags |= IDP_ONLYCA;
334 }
335 if (idp->onlyattr > 0) {
336 idp_only++;
337 crl->idp_flags |= IDP_ONLYATTR;
338 }
339
340 if (idp_only > 1)
341 crl->idp_flags |= IDP_INVALID;
342
343 if (idp->indirectCRL > 0)
344 crl->idp_flags |= IDP_INDIRECT;
345
346 if (idp->onlysomereasons) {
347 crl->idp_flags |= IDP_REASONS;
348 if (idp->onlysomereasons->length > 0)
349 crl->idp_reasons = idp->onlysomereasons->data[0];
350 if (idp->onlysomereasons->length > 1)
351 crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
352 crl->idp_reasons &= CRLDP_ALL_REASONS;
353 }
354
355 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
356}
357
358ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
359 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
360 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
361 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
362} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
363
364IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
365
366IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
367
368IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
369IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
370IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
371
372static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b)
373{
374 return (ASN1_STRING_cmp((ASN1_STRING *)(*a)->serialNumber,
375 (ASN1_STRING *)(*b)->serialNumber));
376}
377
378int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
379{
380 X509_CRL_INFO *inf;
381 inf = crl->crl;
382 if (!inf->revoked)
383 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
384 if (!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
385 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
386 return 0;
387 }
388 inf->enc.modified = 1;
389 return 1;
390}
391
392int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
393{
394 if (crl->meth->crl_verify)
395 return crl->meth->crl_verify(crl, r);
396 return 0;
397}
398
399int X509_CRL_get0_by_serial(X509_CRL *crl,
400 X509_REVOKED **ret, ASN1_INTEGER *serial)
401{
402 if (crl->meth->crl_lookup)
403 return crl->meth->crl_lookup(crl, ret, serial, NULL);
404 return 0;
405}
406
407int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
408{
409 if (crl->meth->crl_lookup)
410 return crl->meth->crl_lookup(crl, ret,
411 X509_get_serialNumber(x),
412 X509_get_issuer_name(x));
413 return 0;
414}
415
416static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
417{
418 return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
419 crl->sig_alg, crl->signature, crl->crl, r));
420}
421
422static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
423 X509_REVOKED *rev)
424{
425 size_t i;
426
427 if (!rev->issuer) {
428 if (!nm)
429 return 1;
430 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
431 return 1;
432 return 0;
433 }
434
435 if (!nm)
436 nm = X509_CRL_get_issuer(crl);
437
438 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
439 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
440 if (gen->type != GEN_DIRNAME)
441 continue;
442 if (!X509_NAME_cmp(nm, gen->d.directoryName))
443 return 1;
444 }
445 return 0;
446
447}
448
449static struct CRYPTO_STATIC_MUTEX g_crl_sort_lock = CRYPTO_STATIC_MUTEX_INIT;
450
451static int def_crl_lookup(X509_CRL *crl,
452 X509_REVOKED **ret, ASN1_INTEGER *serial,
453 X509_NAME *issuer)
454{
455 X509_REVOKED rtmp, *rev;
456 size_t idx;
457 rtmp.serialNumber = serial;
458 /*
459 * Sort revoked into serial number order if not already sorted. Do this
460 * under a lock to avoid race condition.
461 */
462
463 CRYPTO_STATIC_MUTEX_lock_read(&g_crl_sort_lock);
464 const int is_sorted = sk_X509_REVOKED_is_sorted(crl->crl->revoked);
465 CRYPTO_STATIC_MUTEX_unlock_read(&g_crl_sort_lock);
466
467 if (!is_sorted) {
468 CRYPTO_STATIC_MUTEX_lock_write(&g_crl_sort_lock);
469 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) {
470 sk_X509_REVOKED_sort(crl->crl->revoked);
471 }
472 CRYPTO_STATIC_MUTEX_unlock_write(&g_crl_sort_lock);
473 }
474
475 if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp))
476 return 0;
477 /* Need to look for matching name */
478 for (; idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) {
479 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
480 if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
481 return 0;
482 if (crl_revoked_issuer_match(crl, issuer, rev)) {
483 if (ret)
484 *ret = rev;
485 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
486 return 2;
487 return 1;
488 }
489 }
490 return 0;
491}
492
493void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
494{
495 if (meth == NULL)
496 default_crl_method = &int_crl_meth;
497 else
498 default_crl_method = meth;
499}
500
501X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
502 int (*crl_free) (X509_CRL *crl),
503 int (*crl_lookup) (X509_CRL *crl,
504 X509_REVOKED **ret,
505 ASN1_INTEGER *ser,
506 X509_NAME *issuer),
507 int (*crl_verify) (X509_CRL *crl,
508 EVP_PKEY *pk))
509{
510 X509_CRL_METHOD *m;
511 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
512 if (!m)
513 return NULL;
514 m->crl_init = crl_init;
515 m->crl_free = crl_free;
516 m->crl_lookup = crl_lookup;
517 m->crl_verify = crl_verify;
518 m->flags = X509_CRL_METHOD_DYNAMIC;
519 return m;
520}
521
522void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
523{
524 if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
525 return;
526 OPENSSL_free(m);
527}
528
529void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
530{
531 crl->meth_data = dat;
532}
533
534void *X509_CRL_get_meth_data(X509_CRL *crl)
535{
536 return crl->meth_data;
537}
538
539IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
540
541IMPLEMENT_ASN1_SET_OF(X509_CRL)
542