1 /*
2 * Copyright 1995-2022 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 gtmp = X509_REVOKED_get_ext_d2i(rev,
98 NID_certificate_issuer, &j, NULL);
99 if (!gtmp && (j != -1)) {
100 crl->flags |= EXFLAG_INVALID;
101 return 1;
102 }
103
104 if (gtmp) {
105 gens = gtmp;
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 }
118 rev->issuer = gens;
119
120 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
121 if (!reason && (j != -1)) {
122 crl->flags |= EXFLAG_INVALID;
123 return 1;
124 }
125
126 if (reason) {
127 rev->reason = ASN1_ENUMERATED_get(reason);
128 ASN1_ENUMERATED_free(reason);
129 } else
130 rev->reason = CRL_REASON_NONE;
131
132 /* Check for critical CRL entry extensions */
133
134 exts = rev->extensions;
135
136 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
137 ext = sk_X509_EXTENSION_value(exts, j);
138 if (X509_EXTENSION_get_critical(ext)) {
139 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
140 continue;
141 crl->flags |= EXFLAG_CRITICAL;
142 break;
143 }
144 }
145
146 }
147
148 return 1;
149
150 }
151
152 /*
153 * The X509_CRL structure needs a bit of customisation. Cache some extensions
154 * and hash of the whole CRL or set EXFLAG_NO_FINGERPRINT if this fails.
155 */
crl_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)156 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
157 void *exarg)
158 {
159 X509_CRL *crl = (X509_CRL *)*pval;
160 STACK_OF(X509_EXTENSION) *exts;
161 X509_EXTENSION *ext;
162 int idx, i;
163
164 switch (operation) {
165 case ASN1_OP_D2I_PRE:
166 if (crl->meth->crl_free) {
167 if (!crl->meth->crl_free(crl))
168 return 0;
169 }
170 AUTHORITY_KEYID_free(crl->akid);
171 ISSUING_DIST_POINT_free(crl->idp);
172 ASN1_INTEGER_free(crl->crl_number);
173 ASN1_INTEGER_free(crl->base_crl_number);
174 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
175 /* fall thru */
176
177 case ASN1_OP_NEW_POST:
178 crl->idp = NULL;
179 crl->akid = NULL;
180 crl->flags = 0;
181 crl->idp_flags = 0;
182 crl->idp_reasons = CRLDP_ALL_REASONS;
183 crl->meth = default_crl_method;
184 crl->meth_data = NULL;
185 crl->issuers = NULL;
186 crl->crl_number = NULL;
187 crl->base_crl_number = NULL;
188 break;
189
190 case ASN1_OP_D2I_POST:
191 if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL))
192 crl->flags |= EXFLAG_NO_FINGERPRINT;
193 crl->idp = X509_CRL_get_ext_d2i(crl,
194 NID_issuing_distribution_point, &i,
195 NULL);
196 if (crl->idp != NULL) {
197 if (!setup_idp(crl, crl->idp))
198 crl->flags |= EXFLAG_INVALID;
199 }
200 else if (i != -1) {
201 crl->flags |= EXFLAG_INVALID;
202 }
203
204 crl->akid = X509_CRL_get_ext_d2i(crl,
205 NID_authority_key_identifier, &i,
206 NULL);
207 if (crl->akid == NULL && i != -1)
208 crl->flags |= EXFLAG_INVALID;
209
210 crl->crl_number = X509_CRL_get_ext_d2i(crl,
211 NID_crl_number, &i, NULL);
212 if (crl->crl_number == NULL && i != -1)
213 crl->flags |= EXFLAG_INVALID;
214
215 crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
216 NID_delta_crl, &i,
217 NULL);
218 if (crl->base_crl_number == NULL && i != -1)
219 crl->flags |= EXFLAG_INVALID;
220 /* Delta CRLs must have CRL number */
221 if (crl->base_crl_number && !crl->crl_number)
222 crl->flags |= EXFLAG_INVALID;
223
224 /*
225 * See if we have any unhandled critical CRL extensions and indicate
226 * this in a flag. We only currently handle IDP so anything else
227 * critical sets the flag. This code accesses the X509_CRL structure
228 * directly: applications shouldn't do this.
229 */
230
231 exts = crl->crl.extensions;
232
233 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
234 int nid;
235 ext = sk_X509_EXTENSION_value(exts, idx);
236 nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
237 if (nid == NID_freshest_crl)
238 crl->flags |= EXFLAG_FRESHEST;
239 if (X509_EXTENSION_get_critical(ext)) {
240 /* We handle IDP and deltas */
241 if ((nid == NID_issuing_distribution_point)
242 || (nid == NID_authority_key_identifier)
243 || (nid == NID_delta_crl))
244 continue;
245 crl->flags |= EXFLAG_CRITICAL;
246 break;
247 }
248 }
249
250 if (!crl_set_issuers(crl))
251 return 0;
252
253 if (crl->meth->crl_init) {
254 if (crl->meth->crl_init(crl) == 0)
255 return 0;
256 }
257
258 crl->flags |= EXFLAG_SET;
259 break;
260
261 case ASN1_OP_FREE_POST:
262 if (crl->meth != NULL && crl->meth->crl_free != NULL) {
263 if (!crl->meth->crl_free(crl))
264 return 0;
265 }
266 AUTHORITY_KEYID_free(crl->akid);
267 ISSUING_DIST_POINT_free(crl->idp);
268 ASN1_INTEGER_free(crl->crl_number);
269 ASN1_INTEGER_free(crl->base_crl_number);
270 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
271 OPENSSL_free(crl->propq);
272 break;
273 case ASN1_OP_DUP_POST:
274 {
275 X509_CRL *old = exarg;
276
277 if (!ossl_x509_crl_set0_libctx(crl, old->libctx, old->propq))
278 return 0;
279 }
280 break;
281 }
282 return 1;
283 }
284
285 /* Convert IDP into a more convenient form */
286
setup_idp(X509_CRL * crl,ISSUING_DIST_POINT * idp)287 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
288 {
289 int idp_only = 0;
290
291 /* Set various flags according to IDP */
292 crl->idp_flags |= IDP_PRESENT;
293 if (idp->onlyuser > 0) {
294 idp_only++;
295 crl->idp_flags |= IDP_ONLYUSER;
296 }
297 if (idp->onlyCA > 0) {
298 idp_only++;
299 crl->idp_flags |= IDP_ONLYCA;
300 }
301 if (idp->onlyattr > 0) {
302 idp_only++;
303 crl->idp_flags |= IDP_ONLYATTR;
304 }
305
306 if (idp_only > 1)
307 crl->idp_flags |= IDP_INVALID;
308
309 if (idp->indirectCRL > 0)
310 crl->idp_flags |= IDP_INDIRECT;
311
312 if (idp->onlysomereasons) {
313 crl->idp_flags |= IDP_REASONS;
314 if (idp->onlysomereasons->length > 0)
315 crl->idp_reasons = idp->onlysomereasons->data[0];
316 if (idp->onlysomereasons->length > 1)
317 crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
318 crl->idp_reasons &= CRLDP_ALL_REASONS;
319 }
320
321 return DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
322 }
323
324 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
325 ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
326 ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
327 ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
328 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
329
330 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
331
332 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
333
334 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
335
336 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
337
338 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
339
340 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
341 const X509_REVOKED *const *b)
342 {
343 return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
344 (ASN1_STRING *)&(*b)->serialNumber));
345 }
346
X509_CRL_new_ex(OSSL_LIB_CTX * libctx,const char * propq)347 X509_CRL *X509_CRL_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
348 {
349 X509_CRL *crl = NULL;
350
351 crl = (X509_CRL *)ASN1_item_new((X509_CRL_it()));
352 if (!ossl_x509_crl_set0_libctx(crl, libctx, propq)) {
353 X509_CRL_free(crl);
354 crl = NULL;
355 }
356 return crl;
357 }
358
X509_CRL_add0_revoked(X509_CRL * crl,X509_REVOKED * rev)359 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
360 {
361 X509_CRL_INFO *inf;
362
363 inf = &crl->crl;
364 if (inf->revoked == NULL)
365 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
366 if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
367 ERR_raise(ERR_LIB_ASN1, ERR_R_MALLOC_FAILURE);
368 return 0;
369 }
370 inf->enc.modified = 1;
371 return 1;
372 }
373
X509_CRL_verify(X509_CRL * crl,EVP_PKEY * r)374 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
375 {
376 if (crl->meth->crl_verify)
377 return crl->meth->crl_verify(crl, r);
378 return 0;
379 }
380
X509_CRL_get0_by_serial(X509_CRL * crl,X509_REVOKED ** ret,const ASN1_INTEGER * serial)381 int X509_CRL_get0_by_serial(X509_CRL *crl,
382 X509_REVOKED **ret, const ASN1_INTEGER *serial)
383 {
384 if (crl->meth->crl_lookup)
385 return crl->meth->crl_lookup(crl, ret, serial, NULL);
386 return 0;
387 }
388
X509_CRL_get0_by_cert(X509_CRL * crl,X509_REVOKED ** ret,X509 * x)389 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
390 {
391 if (crl->meth->crl_lookup)
392 return crl->meth->crl_lookup(crl, ret,
393 X509_get0_serialNumber(x),
394 X509_get_issuer_name(x));
395 return 0;
396 }
397
def_crl_verify(X509_CRL * crl,EVP_PKEY * r)398 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
399 {
400 return ASN1_item_verify_ex(ASN1_ITEM_rptr(X509_CRL_INFO),
401 &crl->sig_alg, &crl->signature, &crl->crl, NULL,
402 r, crl->libctx, crl->propq);
403 }
404
crl_revoked_issuer_match(X509_CRL * crl,const X509_NAME * nm,X509_REVOKED * rev)405 static int crl_revoked_issuer_match(X509_CRL *crl, const X509_NAME *nm,
406 X509_REVOKED *rev)
407 {
408 int i;
409
410 if (!rev->issuer) {
411 if (!nm)
412 return 1;
413 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
414 return 1;
415 return 0;
416 }
417
418 if (!nm)
419 nm = X509_CRL_get_issuer(crl);
420
421 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
422 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
423 if (gen->type != GEN_DIRNAME)
424 continue;
425 if (!X509_NAME_cmp(nm, gen->d.directoryName))
426 return 1;
427 }
428 return 0;
429
430 }
431
def_crl_lookup(X509_CRL * crl,X509_REVOKED ** ret,const ASN1_INTEGER * serial,const X509_NAME * issuer)432 static int def_crl_lookup(X509_CRL *crl,
433 X509_REVOKED **ret, const ASN1_INTEGER *serial,
434 const X509_NAME *issuer)
435 {
436 X509_REVOKED rtmp, *rev;
437 int idx, num;
438
439 if (crl->crl.revoked == NULL)
440 return 0;
441
442 /*
443 * Sort revoked into serial number order if not already sorted. Do this
444 * under a lock to avoid race condition.
445 */
446 if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
447 if (!CRYPTO_THREAD_write_lock(crl->lock))
448 return 0;
449 sk_X509_REVOKED_sort(crl->crl.revoked);
450 CRYPTO_THREAD_unlock(crl->lock);
451 }
452 rtmp.serialNumber = *serial;
453 idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
454 if (idx < 0)
455 return 0;
456 /* Need to look for matching name */
457 for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
458 rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
459 if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
460 return 0;
461 if (crl_revoked_issuer_match(crl, issuer, rev)) {
462 if (ret)
463 *ret = rev;
464 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
465 return 2;
466 return 1;
467 }
468 }
469 return 0;
470 }
471
X509_CRL_set_default_method(const X509_CRL_METHOD * meth)472 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
473 {
474 if (meth == NULL)
475 default_crl_method = &int_crl_meth;
476 else
477 default_crl_method = meth;
478 }
479
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))480 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
481 int (*crl_free) (X509_CRL *crl),
482 int (*crl_lookup) (X509_CRL *crl,
483 X509_REVOKED **ret,
484 const ASN1_INTEGER *ser,
485 const X509_NAME *issuer),
486 int (*crl_verify) (X509_CRL *crl,
487 EVP_PKEY *pk))
488 {
489 X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
490
491 if (m == NULL) {
492 ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
493 return NULL;
494 }
495 m->crl_init = crl_init;
496 m->crl_free = crl_free;
497 m->crl_lookup = crl_lookup;
498 m->crl_verify = crl_verify;
499 m->flags = X509_CRL_METHOD_DYNAMIC;
500 return m;
501 }
502
X509_CRL_METHOD_free(X509_CRL_METHOD * m)503 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
504 {
505 if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
506 return;
507 OPENSSL_free(m);
508 }
509
X509_CRL_set_meth_data(X509_CRL * crl,void * dat)510 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
511 {
512 crl->meth_data = dat;
513 }
514
X509_CRL_get_meth_data(X509_CRL * crl)515 void *X509_CRL_get_meth_data(X509_CRL *crl)
516 {
517 return crl->meth_data;
518 }
519
ossl_x509_crl_set0_libctx(X509_CRL * x,OSSL_LIB_CTX * libctx,const char * propq)520 int ossl_x509_crl_set0_libctx(X509_CRL *x, OSSL_LIB_CTX *libctx,
521 const char *propq)
522 {
523 if (x != NULL) {
524 x->libctx = libctx;
525 OPENSSL_free(x->propq);
526 x->propq = NULL;
527 if (propq != NULL) {
528 x->propq = OPENSSL_strdup(propq);
529 if (x->propq == NULL)
530 return 0;
531 }
532 }
533 return 1;
534 }
535