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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
58 #include <stdio.h>
59 #include "internal/cryptlib.h"
60 #include <openssl/asn1t.h>
61 #include <openssl/x509.h>
62 #include "internal/x509_int.h"
63 #include <openssl/x509v3.h>
64 #include "x509_lcl.h"
65
66 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
67 const X509_REVOKED *const *b);
68 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
69
70 ASN1_SEQUENCE(X509_REVOKED) = {
71 ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
72 ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
73 ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
74 } ASN1_SEQUENCE_END(X509_REVOKED)
75
76 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
77 static int def_crl_lookup(X509_CRL *crl,
78 X509_REVOKED **ret, ASN1_INTEGER *serial,
79 X509_NAME *issuer);
80
81 static X509_CRL_METHOD int_crl_meth = {
82 0,
83 0, 0,
84 def_crl_lookup,
85 def_crl_verify
86 };
87
88 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
89
90 /*
91 * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
92 * the original encoding the signature wont be affected by reordering of the
93 * revoked field.
94 */
95 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
96 void *exarg)
97 {
98 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
99
100 if (!a || !a->revoked)
101 return 1;
102 switch (operation) {
103 /*
104 * Just set cmp function here. We don't sort because that would
105 * affect the output of X509_CRL_print().
106 */
107 case ASN1_OP_D2I_POST:
108 (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
109 break;
110 }
111 return 1;
112 }
113
114
115 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
116 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
117 ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
118 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
119 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
120 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
121 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
122 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
123 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
124
125 /*
126 * Set CRL entry issuer according to CRL certificate issuer extension. Check
127 * for unhandled critical CRL entry extensions.
128 */
129
130 static int crl_set_issuers(X509_CRL *crl)
131 {
132
133 int i, j;
134 GENERAL_NAMES *gens, *gtmp;
135 STACK_OF(X509_REVOKED) *revoked;
136
137 revoked = X509_CRL_get_REVOKED(crl);
138
139 gens = NULL;
140 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
141 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
142 STACK_OF(X509_EXTENSION) *exts;
143 ASN1_ENUMERATED *reason;
144 X509_EXTENSION *ext;
145 gtmp = X509_REVOKED_get_ext_d2i(rev,
146 NID_certificate_issuer, &j, NULL);
147 if (!gtmp && (j != -1)) {
148 crl->flags |= EXFLAG_INVALID;
149 return 1;
150 }
151
152 if (gtmp) {
153 gens = gtmp;
154 if (!crl->issuers) {
155 crl->issuers = sk_GENERAL_NAMES_new_null();
156 if (!crl->issuers)
157 return 0;
158 }
159 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
160 return 0;
161 }
162 rev->issuer = gens;
163
164 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
165 if (!reason && (j != -1)) {
166 crl->flags |= EXFLAG_INVALID;
167 return 1;
168 }
169
170 if (reason) {
171 rev->reason = ASN1_ENUMERATED_get(reason);
172 ASN1_ENUMERATED_free(reason);
173 } else
174 rev->reason = CRL_REASON_NONE;
175
176 /* Check for critical CRL entry extensions */
177
178 exts = rev->extensions;
179
180 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
181 ext = sk_X509_EXTENSION_value(exts, j);
182 if (X509_EXTENSION_get_critical(ext)) {
183 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
184 continue;
185 crl->flags |= EXFLAG_CRITICAL;
186 break;
187 }
188 }
189
190 }
191
192 return 1;
193
194 }
195
196 /*
197 * The X509_CRL structure needs a bit of customisation. Cache some extensions
198 * and hash of the whole CRL.
199 */
200 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
201 void *exarg)
202 {
203 X509_CRL *crl = (X509_CRL *)*pval;
204 STACK_OF(X509_EXTENSION) *exts;
205 X509_EXTENSION *ext;
206 int idx;
207
208 switch (operation) {
209 case ASN1_OP_NEW_POST:
210 crl->idp = NULL;
211 crl->akid = NULL;
212 crl->flags = 0;
213 crl->idp_flags = 0;
214 crl->idp_reasons = CRLDP_ALL_REASONS;
215 crl->meth = default_crl_method;
216 crl->meth_data = NULL;
217 crl->issuers = NULL;
218 crl->crl_number = NULL;
219 crl->base_crl_number = NULL;
220 break;
221
222 case ASN1_OP_D2I_POST:
223 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
224 crl->idp = X509_CRL_get_ext_d2i(crl,
225 NID_issuing_distribution_point, NULL,
226 NULL);
227 if (crl->idp)
228 setup_idp(crl, crl->idp);
229
230 crl->akid = X509_CRL_get_ext_d2i(crl,
231 NID_authority_key_identifier, NULL,
232 NULL);
233
234 crl->crl_number = X509_CRL_get_ext_d2i(crl,
235 NID_crl_number, NULL, NULL);
236
237 crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
238 NID_delta_crl, NULL,
239 NULL);
240 /* Delta CRLs must have CRL number */
241 if (crl->base_crl_number && !crl->crl_number)
242 crl->flags |= EXFLAG_INVALID;
243
244 /*
245 * See if we have any unhandled critical CRL extensions and indicate
246 * this in a flag. We only currently handle IDP so anything else
247 * critical sets the flag. This code accesses the X509_CRL structure
248 * directly: applications shouldn't do this.
249 */
250
251 exts = crl->crl.extensions;
252
253 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
254 int nid;
255 ext = sk_X509_EXTENSION_value(exts, idx);
256 nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
257 if (nid == NID_freshest_crl)
258 crl->flags |= EXFLAG_FRESHEST;
259 if (X509_EXTENSION_get_critical(ext)) {
260 /* We handle IDP and deltas */
261 if ((nid == NID_issuing_distribution_point)
262 || (nid == NID_authority_key_identifier)
263 || (nid == NID_delta_crl))
264 break;;
265 crl->flags |= EXFLAG_CRITICAL;
266 break;
267 }
268 }
269
270 if (!crl_set_issuers(crl))
271 return 0;
272
273 if (crl->meth->crl_init) {
274 if (crl->meth->crl_init(crl) == 0)
275 return 0;
276 }
277 break;
278
279 case ASN1_OP_FREE_POST:
280 if (crl->meth->crl_free) {
281 if (!crl->meth->crl_free(crl))
282 return 0;
283 }
284 AUTHORITY_KEYID_free(crl->akid);
285 ISSUING_DIST_POINT_free(crl->idp);
286 ASN1_INTEGER_free(crl->crl_number);
287 ASN1_INTEGER_free(crl->base_crl_number);
288 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
289 break;
290 }
291 return 1;
292 }
293
294 /* Convert IDP into a more convenient form */
295
296 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
297 {
298 int idp_only = 0;
299 /* Set various flags according to IDP */
300 crl->idp_flags |= IDP_PRESENT;
301 if (idp->onlyuser > 0) {
302 idp_only++;
303 crl->idp_flags |= IDP_ONLYUSER;
304 }
305 if (idp->onlyCA > 0) {
306 idp_only++;
307 crl->idp_flags |= IDP_ONLYCA;
308 }
309 if (idp->onlyattr > 0) {
310 idp_only++;
311 crl->idp_flags |= IDP_ONLYATTR;
312 }
313
314 if (idp_only > 1)
315 crl->idp_flags |= IDP_INVALID;
316
317 if (idp->indirectCRL > 0)
318 crl->idp_flags |= IDP_INDIRECT;
319
320 if (idp->onlysomereasons) {
321 crl->idp_flags |= IDP_REASONS;
322 if (idp->onlysomereasons->length > 0)
323 crl->idp_reasons = idp->onlysomereasons->data[0];
324 if (idp->onlysomereasons->length > 1)
325 crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
326 crl->idp_reasons &= CRLDP_ALL_REASONS;
327 }
328
329 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
330 }
331
332 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
333 ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
334 ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
335 ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
336 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
337
338 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
339
340 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
341
342 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
343
344 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
345
346 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
347
348 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
349 const X509_REVOKED *const *b)
350 {
351 return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
352 (ASN1_STRING *)&(*b)->serialNumber));
353 }
354
355 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
356 {
357 X509_CRL_INFO *inf;
358 inf = &crl->crl;
359 if (inf->revoked == NULL)
360 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
361 if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
362 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
363 return 0;
364 }
365 inf->enc.modified = 1;
366 return 1;
367 }
368
369 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
370 {
371 if (crl->meth->crl_verify)
372 return crl->meth->crl_verify(crl, r);
373 return 0;
374 }
375
376 int X509_CRL_get0_by_serial(X509_CRL *crl,
377 X509_REVOKED **ret, ASN1_INTEGER *serial)
378 {
379 if (crl->meth->crl_lookup)
380 return crl->meth->crl_lookup(crl, ret, serial, NULL);
381 return 0;
382 }
383
384 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
385 {
386 if (crl->meth->crl_lookup)
387 return crl->meth->crl_lookup(crl, ret,
388 X509_get_serialNumber(x),
389 X509_get_issuer_name(x));
390 return 0;
391 }
392
393 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
394 {
395 return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
396 &crl->sig_alg, &crl->signature, &crl->crl, r));
397 }
398
399 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
400 X509_REVOKED *rev)
401 {
402 int i;
403
404 if (!rev->issuer) {
405 if (!nm)
406 return 1;
407 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
408 return 1;
409 return 0;
410 }
411
412 if (!nm)
413 nm = X509_CRL_get_issuer(crl);
414
415 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
416 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
417 if (gen->type != GEN_DIRNAME)
418 continue;
419 if (!X509_NAME_cmp(nm, gen->d.directoryName))
420 return 1;
421 }
422 return 0;
423
424 }
425
426 static int def_crl_lookup(X509_CRL *crl,
427 X509_REVOKED **ret, ASN1_INTEGER *serial,
428 X509_NAME *issuer)
429 {
430 X509_REVOKED rtmp, *rev;
431 int idx;
432 rtmp.serialNumber = *serial;
433 /*
434 * Sort revoked into serial number order if not already sorted. Do this
435 * under a lock to avoid race condition.
436 */
437 if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
438 CRYPTO_THREAD_write_lock(crl->lock);
439 sk_X509_REVOKED_sort(crl->crl.revoked);
440 CRYPTO_THREAD_unlock(crl->lock);
441 }
442 idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
443 if (idx < 0)
444 return 0;
445 /* Need to look for matching name */
446 for (; idx < sk_X509_REVOKED_num(crl->crl.revoked); idx++) {
447 rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
448 if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
449 return 0;
450 if (crl_revoked_issuer_match(crl, issuer, rev)) {
451 if (ret)
452 *ret = rev;
453 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
454 return 2;
455 return 1;
456 }
457 }
458 return 0;
459 }
460
461 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
462 {
463 if (meth == NULL)
464 default_crl_method = &int_crl_meth;
465 else
466 default_crl_method = meth;
467 }
468
469 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
470 int (*crl_free) (X509_CRL *crl),
471 int (*crl_lookup) (X509_CRL *crl,
472 X509_REVOKED **ret,
473 ASN1_INTEGER *ser,
474 X509_NAME *issuer),
475 int (*crl_verify) (X509_CRL *crl,
476 EVP_PKEY *pk))
477 {
478 X509_CRL_METHOD *m;
479 m = OPENSSL_malloc(sizeof(*m));
480 if (m == NULL)
481 return NULL;
482 m->crl_init = crl_init;
483 m->crl_free = crl_free;
484 m->crl_lookup = crl_lookup;
485 m->crl_verify = crl_verify;
486 m->flags = X509_CRL_METHOD_DYNAMIC;
487 return m;
488 }
489
490 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
491 {
492 if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
493 return;
494 OPENSSL_free(m);
495 }
496
497 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
498 {
499 crl->meth_data = dat;
500 }
501
502 void *X509_CRL_get_meth_data(X509_CRL *crl)
503 {
504 return crl->meth_data;
505 }