1 /*
2 * Copyright 1995-2025 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include "internal/cryptlib.h"
12 #include <openssl/asn1t.h>
13 #include <openssl/x509.h>
14 #include "crypto/x509.h"
15 #include <openssl/x509v3.h>
16 #include "x509_local.h"
17
18 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
19 const X509_REVOKED *const *b);
20 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
21
22 ASN1_SEQUENCE(X509_REVOKED) = {
23 ASN1_EMBED(X509_REVOKED, serialNumber, ASN1_INTEGER),
24 ASN1_SIMPLE(X509_REVOKED, revocationDate, ASN1_TIME),
25 ASN1_SEQUENCE_OF_OPT(X509_REVOKED, extensions, X509_EXTENSION)
26 } ASN1_SEQUENCE_END(X509_REVOKED)
27
28 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
29 static int def_crl_lookup(X509_CRL *crl,
30 X509_REVOKED **ret, const ASN1_INTEGER *serial,
31 const X509_NAME *issuer);
32
33 static X509_CRL_METHOD int_crl_meth = {
34 0,
35 0, 0,
36 def_crl_lookup,
37 def_crl_verify
38 };
39
40 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
41
42 /*
43 * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
44 * the original encoding the signature won't be affected by reordering of the
45 * revoked field.
46 */
crl_inf_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)47 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
48 void *exarg)
49 {
50 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
51
52 if (!a || !a->revoked)
53 return 1;
54 switch (operation) {
55 /*
56 * Just set cmp function here. We don't sort because that would
57 * affect the output of X509_CRL_print().
58 */
59 case ASN1_OP_D2I_POST:
60 (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
61 break;
62 }
63 return 1;
64 }
65
66
67 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
68 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
69 ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
70 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
71 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
72 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
73 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
74 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
75 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
76
77 /*
78 * Set CRL entry issuer according to CRL certificate issuer extension. Check
79 * for unhandled critical CRL entry extensions.
80 */
81
82 static int crl_set_issuers(X509_CRL *crl)
83 {
84
85 int i, j;
86 GENERAL_NAMES *gens, *gtmp;
87 STACK_OF(X509_REVOKED) *revoked;
88
89 revoked = X509_CRL_get_REVOKED(crl);
90
91 gens = NULL;
92 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
93 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
94 STACK_OF(X509_EXTENSION) *exts;
95 ASN1_ENUMERATED *reason;
96 X509_EXTENSION *ext;
97
98 gtmp = X509_REVOKED_get_ext_d2i(rev,
99 NID_certificate_issuer, &j, NULL);
100 if (gtmp == NULL && j != -1) {
101 crl->flags |= EXFLAG_INVALID;
102 return 1;
103 }
104
105 if (gtmp != NULL) {
106 if (crl->issuers == NULL) {
107 crl->issuers = sk_GENERAL_NAMES_new_null();
108 if (crl->issuers == NULL) {
109 GENERAL_NAMES_free(gtmp);
110 return 0;
111 }
112 }
113 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) {
114 GENERAL_NAMES_free(gtmp);
115 return 0;
116 }
117 gens = gtmp;
118 }
119 rev->issuer = gens;
120
121 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
122 if (reason == NULL && j != -1) {
123 crl->flags |= EXFLAG_INVALID;
124 return 1;
125 }
126
127 if (reason != NULL) {
128 rev->reason = ASN1_ENUMERATED_get(reason);
129 ASN1_ENUMERATED_free(reason);
130 } else
131 rev->reason = CRL_REASON_NONE;
132
133 /* Check for critical CRL entry extensions */
134
135 exts = rev->extensions;
136
137 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
138 ext = sk_X509_EXTENSION_value(exts, j);
139 if (X509_EXTENSION_get_critical(ext)) {
140 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext))
141 == NID_certificate_issuer)
142 continue;
143 crl->flags |= EXFLAG_CRITICAL;
144 break;
145 }
146 }
147
148 }
149
150 return 1;
151
152 }
153
154 /*
155 * The X509_CRL structure needs a bit of customisation. Cache some extensions
156 * and hash of the whole CRL or set EXFLAG_NO_FINGERPRINT if this fails.
157 */
crl_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)158 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
159 void *exarg)
160 {
161 X509_CRL *crl = (X509_CRL *)*pval;
162 STACK_OF(X509_EXTENSION) *exts;
163 X509_EXTENSION *ext;
164 int idx, i;
165
166 switch (operation) {
167 case ASN1_OP_D2I_PRE:
168 if (crl->meth->crl_free) {
169 if (!crl->meth->crl_free(crl))
170 return 0;
171 }
172 AUTHORITY_KEYID_free(crl->akid);
173 ISSUING_DIST_POINT_free(crl->idp);
174 ASN1_INTEGER_free(crl->crl_number);
175 ASN1_INTEGER_free(crl->base_crl_number);
176 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
177 /* fall through */
178
179 case ASN1_OP_NEW_POST:
180 crl->idp = NULL;
181 crl->akid = NULL;
182 crl->flags = 0;
183 crl->idp_flags = 0;
184 crl->idp_reasons = CRLDP_ALL_REASONS;
185 crl->meth = default_crl_method;
186 crl->meth_data = NULL;
187 crl->issuers = NULL;
188 crl->crl_number = NULL;
189 crl->base_crl_number = NULL;
190 break;
191
192 case ASN1_OP_D2I_POST:
193 if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL))
194 crl->flags |= EXFLAG_NO_FINGERPRINT;
195 crl->idp = X509_CRL_get_ext_d2i(crl,
196 NID_issuing_distribution_point, &i,
197 NULL);
198 if (crl->idp != NULL) {
199 if (!setup_idp(crl, crl->idp))
200 crl->flags |= EXFLAG_INVALID;
201 }
202 else if (i != -1) {
203 crl->flags |= EXFLAG_INVALID;
204 }
205
206 crl->akid = X509_CRL_get_ext_d2i(crl,
207 NID_authority_key_identifier, &i,
208 NULL);
209 if (crl->akid == NULL && i != -1)
210 crl->flags |= EXFLAG_INVALID;
211
212 crl->crl_number = X509_CRL_get_ext_d2i(crl,
213 NID_crl_number, &i, NULL);
214 if (crl->crl_number == NULL && i != -1)
215 crl->flags |= EXFLAG_INVALID;
216
217 crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
218 NID_delta_crl, &i,
219 NULL);
220 if (crl->base_crl_number == NULL && i != -1)
221 crl->flags |= EXFLAG_INVALID;
222 /* Delta CRLs must have CRL number */
223 if (crl->base_crl_number && !crl->crl_number)
224 crl->flags |= EXFLAG_INVALID;
225
226 /*
227 * See if we have any unhandled critical CRL extensions and indicate
228 * this in a flag. We only currently handle IDP so anything else
229 * critical sets the flag. This code accesses the X509_CRL structure
230 * directly: applications shouldn't do this.
231 */
232
233 exts = crl->crl.extensions;
234
235 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
236 int nid;
237 ext = sk_X509_EXTENSION_value(exts, idx);
238 nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
239 if (nid == NID_freshest_crl)
240 crl->flags |= EXFLAG_FRESHEST;
241 if (X509_EXTENSION_get_critical(ext)) {
242 /* We handle IDP and deltas */
243 if ((nid == NID_issuing_distribution_point)
244 || (nid == NID_authority_key_identifier)
245 || (nid == NID_delta_crl))
246 continue;
247 crl->flags |= EXFLAG_CRITICAL;
248 break;
249 }
250 }
251
252 if (!crl_set_issuers(crl))
253 return 0;
254
255 if (crl->meth->crl_init) {
256 if (crl->meth->crl_init(crl) == 0)
257 return 0;
258 }
259
260 crl->flags |= EXFLAG_SET;
261 break;
262
263 case ASN1_OP_FREE_POST:
264 if (crl->meth != NULL && crl->meth->crl_free != NULL) {
265 if (!crl->meth->crl_free(crl))
266 return 0;
267 }
268 AUTHORITY_KEYID_free(crl->akid);
269 ISSUING_DIST_POINT_free(crl->idp);
270 ASN1_INTEGER_free(crl->crl_number);
271 ASN1_INTEGER_free(crl->base_crl_number);
272 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
273 OPENSSL_free(crl->propq);
274 break;
275 case ASN1_OP_DUP_POST:
276 {
277 X509_CRL *old = exarg;
278
279 if (!ossl_x509_crl_set0_libctx(crl, old->libctx, old->propq))
280 return 0;
281 }
282 break;
283 }
284 return 1;
285 }
286
287 /* Convert IDP into a more convenient form */
288
setup_idp(X509_CRL * crl,ISSUING_DIST_POINT * idp)289 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
290 {
291 int idp_only = 0;
292 int ret = 0;
293
294 /* Set various flags according to IDP */
295 crl->idp_flags |= IDP_PRESENT;
296 if (idp->onlyuser > 0) {
297 idp_only++;
298 crl->idp_flags |= IDP_ONLYUSER;
299 }
300 if (idp->onlyCA > 0) {
301 idp_only++;
302 crl->idp_flags |= IDP_ONLYCA;
303 }
304 if (idp->onlyattr > 0) {
305 idp_only++;
306 crl->idp_flags |= IDP_ONLYATTR;
307 }
308
309 if (idp_only > 1)
310 crl->idp_flags |= IDP_INVALID;
311
312 if (idp->indirectCRL > 0)
313 crl->idp_flags |= IDP_INDIRECT;
314
315 if (idp->onlysomereasons) {
316 crl->idp_flags |= IDP_REASONS;
317 if (idp->onlysomereasons->length > 0)
318 crl->idp_reasons = idp->onlysomereasons->data[0];
319 if (idp->onlysomereasons->length > 1)
320 crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
321 crl->idp_reasons &= CRLDP_ALL_REASONS;
322 }
323
324 ret = DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
325
326 /*
327 * RFC5280 specifies that if onlyContainsUserCerts, onlyContainsCACerts,
328 * indirectCRL, and OnlyContainsAttributeCerts are all FALSE, there must
329 * be either a distributionPoint field or an onlySomeReasons field present.
330 */
331 if (crl->idp_flags == IDP_PRESENT && idp->distpoint == NULL)
332 crl->idp_flags |= IDP_INVALID;
333
334 return ret;
335 }
336
337 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
338 ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
339 ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
340 ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
341 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
342
343 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
344
345 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
346
347 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
348
349 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
350
351 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
352
353 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
354 const X509_REVOKED *const *b)
355 {
356 return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
357 (ASN1_STRING *)&(*b)->serialNumber));
358 }
359
X509_CRL_new_ex(OSSL_LIB_CTX * libctx,const char * propq)360 X509_CRL *X509_CRL_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
361 {
362 X509_CRL *crl = NULL;
363
364 crl = (X509_CRL *)ASN1_item_new((X509_CRL_it()));
365 if (!ossl_x509_crl_set0_libctx(crl, libctx, propq)) {
366 X509_CRL_free(crl);
367 crl = NULL;
368 }
369 return crl;
370 }
371
X509_CRL_add0_revoked(X509_CRL * crl,X509_REVOKED * rev)372 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
373 {
374 X509_CRL_INFO *inf;
375
376 inf = &crl->crl;
377 if (inf->revoked == NULL)
378 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
379 if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
380 ERR_raise(ERR_LIB_ASN1, ERR_R_CRYPTO_LIB);
381 return 0;
382 }
383 inf->enc.modified = 1;
384 return 1;
385 }
386
X509_CRL_verify(X509_CRL * crl,EVP_PKEY * r)387 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
388 {
389 if (crl->meth->crl_verify)
390 return crl->meth->crl_verify(crl, r);
391 return 0;
392 }
393
X509_CRL_get0_by_serial(X509_CRL * crl,X509_REVOKED ** ret,const ASN1_INTEGER * serial)394 int X509_CRL_get0_by_serial(X509_CRL *crl,
395 X509_REVOKED **ret, const ASN1_INTEGER *serial)
396 {
397 if (crl->meth->crl_lookup)
398 return crl->meth->crl_lookup(crl, ret, serial, NULL);
399 return 0;
400 }
401
X509_CRL_get0_by_cert(X509_CRL * crl,X509_REVOKED ** ret,X509 * x)402 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
403 {
404 if (crl->meth->crl_lookup)
405 return crl->meth->crl_lookup(crl, ret,
406 X509_get0_serialNumber(x),
407 X509_get_issuer_name(x));
408 return 0;
409 }
410
def_crl_verify(X509_CRL * crl,EVP_PKEY * r)411 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
412 {
413 return ASN1_item_verify_ex(ASN1_ITEM_rptr(X509_CRL_INFO),
414 &crl->sig_alg, &crl->signature, &crl->crl, NULL,
415 r, crl->libctx, crl->propq);
416 }
417
crl_revoked_issuer_match(X509_CRL * crl,const X509_NAME * nm,X509_REVOKED * rev)418 static int crl_revoked_issuer_match(X509_CRL *crl, const X509_NAME *nm,
419 X509_REVOKED *rev)
420 {
421 int i;
422
423 if (!rev->issuer) {
424 if (!nm)
425 return 1;
426 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
427 return 1;
428 return 0;
429 }
430
431 if (!nm)
432 nm = X509_CRL_get_issuer(crl);
433
434 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
435 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
436 if (gen->type != GEN_DIRNAME)
437 continue;
438 if (!X509_NAME_cmp(nm, gen->d.directoryName))
439 return 1;
440 }
441 return 0;
442
443 }
444
def_crl_lookup(X509_CRL * crl,X509_REVOKED ** ret,const ASN1_INTEGER * serial,const X509_NAME * issuer)445 static int def_crl_lookup(X509_CRL *crl,
446 X509_REVOKED **ret, const ASN1_INTEGER *serial,
447 const X509_NAME *issuer)
448 {
449 X509_REVOKED rtmp, *rev;
450 int idx, num;
451
452 if (crl->crl.revoked == NULL)
453 return 0;
454
455 /*
456 * Sort revoked into serial number order if not already sorted. Do this
457 * under a lock to avoid race condition.
458 */
459 if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
460 if (!CRYPTO_THREAD_write_lock(crl->lock))
461 return 0;
462 sk_X509_REVOKED_sort(crl->crl.revoked);
463 CRYPTO_THREAD_unlock(crl->lock);
464 }
465 rtmp.serialNumber = *serial;
466 idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
467 if (idx < 0)
468 return 0;
469 /* Need to look for matching name */
470 for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
471 rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
472 if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
473 return 0;
474 if (crl_revoked_issuer_match(crl, issuer, rev)) {
475 if (ret)
476 *ret = rev;
477 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
478 return 2;
479 return 1;
480 }
481 }
482 return 0;
483 }
484
X509_CRL_set_default_method(const X509_CRL_METHOD * meth)485 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
486 {
487 if (meth == NULL)
488 default_crl_method = &int_crl_meth;
489 else
490 default_crl_method = meth;
491 }
492
X509_CRL_METHOD_new(int (* crl_init)(X509_CRL * crl),int (* crl_free)(X509_CRL * crl),int (* crl_lookup)(X509_CRL * crl,X509_REVOKED ** ret,const ASN1_INTEGER * ser,const X509_NAME * issuer),int (* crl_verify)(X509_CRL * crl,EVP_PKEY * pk))493 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
494 int (*crl_free) (X509_CRL *crl),
495 int (*crl_lookup) (X509_CRL *crl,
496 X509_REVOKED **ret,
497 const ASN1_INTEGER *ser,
498 const X509_NAME *issuer),
499 int (*crl_verify) (X509_CRL *crl,
500 EVP_PKEY *pk))
501 {
502 X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
503
504 if (m == NULL)
505 return NULL;
506 m->crl_init = crl_init;
507 m->crl_free = crl_free;
508 m->crl_lookup = crl_lookup;
509 m->crl_verify = crl_verify;
510 m->flags = X509_CRL_METHOD_DYNAMIC;
511 return m;
512 }
513
X509_CRL_METHOD_free(X509_CRL_METHOD * m)514 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
515 {
516 if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
517 return;
518 OPENSSL_free(m);
519 }
520
X509_CRL_set_meth_data(X509_CRL * crl,void * dat)521 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
522 {
523 crl->meth_data = dat;
524 }
525
X509_CRL_get_meth_data(X509_CRL * crl)526 void *X509_CRL_get_meth_data(X509_CRL *crl)
527 {
528 return crl->meth_data;
529 }
530
ossl_x509_crl_set0_libctx(X509_CRL * x,OSSL_LIB_CTX * libctx,const char * propq)531 int ossl_x509_crl_set0_libctx(X509_CRL *x, OSSL_LIB_CTX *libctx,
532 const char *propq)
533 {
534 if (x != NULL) {
535 x->libctx = libctx;
536 OPENSSL_free(x->propq);
537 x->propq = NULL;
538 if (propq != NULL) {
539 x->propq = OPENSSL_strdup(propq);
540 if (x->propq == NULL)
541 return 0;
542 }
543 }
544 return 1;
545 }
546