1 /* crypto/asn1/x_crl.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59 #include <stdio.h>
60 #include "cryptlib.h"
61 #include "asn1_locl.h"
62 #include <openssl/asn1t.h>
63 #include <openssl/x509.h>
64 #include <openssl/x509v3.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_SIMPLE(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, X509_NAME *issuer);
79
80 static X509_CRL_METHOD int_crl_meth =
81 {
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 /* The X509_CRL_INFO structure needs a bit of customisation.
91 * Since we cache the original encoding the signature wont be affected by
92 * reordering of the revoked field.
93 */
94 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
95 void *exarg)
96 {
97 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
98
99 if(!a || !a->revoked) return 1;
100 switch(operation) {
101 /* Just set cmp function here. We don't sort because that
102 * would affect the output of X509_CRL_print().
103 */
104 case ASN1_OP_D2I_POST:
105 (void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp);
106 break;
107 }
108 return 1;
109 }
110
111
112 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
113 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
114 ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
115 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
116 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
117 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
118 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
119 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
120 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
121
122 /* Set CRL entry issuer according to CRL certificate issuer extension.
123 * Check for unhandled critical CRL entry extensions.
124 */
125
126 static int crl_set_issuers(X509_CRL *crl)
127 {
128
129 int i, j;
130 GENERAL_NAMES *gens, *gtmp;
131 STACK_OF(X509_REVOKED) *revoked;
132
133 revoked = X509_CRL_get_REVOKED(crl);
134
135 gens = NULL;
136 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++)
137 {
138 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
139 STACK_OF(X509_EXTENSION) *exts;
140 ASN1_ENUMERATED *reason;
141 X509_EXTENSION *ext;
142 gtmp = X509_REVOKED_get_ext_d2i(rev,
143 NID_certificate_issuer,
144 &j, NULL);
145 if (!gtmp && (j != -1))
146 {
147 crl->flags |= EXFLAG_INVALID;
148 return 1;
149 }
150
151 if (gtmp)
152 {
153 gens = gtmp;
154 if (!crl->issuers)
155 {
156 crl->issuers = sk_GENERAL_NAMES_new_null();
157 if (!crl->issuers)
158 return 0;
159 }
160 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
161 return 0;
162 }
163 rev->issuer = gens;
164
165 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason,
166 &j, NULL);
167 if (!reason && (j != -1))
168 {
169 crl->flags |= EXFLAG_INVALID;
170 return 1;
171 }
172
173 if (reason)
174 {
175 rev->reason = ASN1_ENUMERATED_get(reason);
176 ASN1_ENUMERATED_free(reason);
177 }
178 else
179 rev->reason = CRL_REASON_NONE;
180
181 /* Check for critical CRL entry extensions */
182
183 exts = rev->extensions;
184
185 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
186 {
187 ext = sk_X509_EXTENSION_value(exts, j);
188 if (ext->critical > 0)
189 {
190 if (OBJ_obj2nid(ext->object) ==
191 NID_certificate_issuer)
192 continue;
193 crl->flags |= EXFLAG_CRITICAL;
194 break;
195 }
196 }
197
198
199 }
200
201 return 1;
202
203 }
204
205 /* The X509_CRL structure needs a bit of customisation. Cache some extensions
206 * and hash of the whole CRL.
207 */
208 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
209 void *exarg)
210 {
211 X509_CRL *crl = (X509_CRL *)*pval;
212 STACK_OF(X509_EXTENSION) *exts;
213 X509_EXTENSION *ext;
214 int idx;
215
216 switch(operation)
217 {
218 case ASN1_OP_NEW_POST:
219 crl->idp = NULL;
220 crl->akid = NULL;
221 crl->flags = 0;
222 crl->idp_flags = 0;
223 crl->idp_reasons = CRLDP_ALL_REASONS;
224 crl->meth = default_crl_method;
225 crl->meth_data = NULL;
226 crl->issuers = NULL;
227 crl->crl_number = NULL;
228 crl->base_crl_number = NULL;
229 break;
230
231 case ASN1_OP_D2I_POST:
232 #ifndef OPENSSL_NO_SHA
233 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
234 #endif
235 crl->idp = X509_CRL_get_ext_d2i(crl,
236 NID_issuing_distribution_point, NULL, NULL);
237 if (crl->idp)
238 setup_idp(crl, crl->idp);
239
240 crl->akid = X509_CRL_get_ext_d2i(crl,
241 NID_authority_key_identifier, NULL, NULL);
242
243 crl->crl_number = X509_CRL_get_ext_d2i(crl,
244 NID_crl_number, NULL, NULL);
245
246 crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
247 NID_delta_crl, NULL, NULL);
248 /* Delta CRLs must have CRL number */
249 if (crl->base_crl_number && !crl->crl_number)
250 crl->flags |= EXFLAG_INVALID;
251
252 /* See if we have any unhandled critical CRL extensions and
253 * indicate this in a flag. We only currently handle IDP so
254 * anything else critical sets the flag.
255 *
256 * This code accesses the X509_CRL structure directly:
257 * applications shouldn't do this.
258 */
259
260 exts = crl->crl->extensions;
261
262 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
263 {
264 int nid;
265 ext = sk_X509_EXTENSION_value(exts, idx);
266 nid = OBJ_obj2nid(ext->object);
267 if (nid == NID_freshest_crl)
268 crl->flags |= EXFLAG_FRESHEST;
269 if (ext->critical > 0)
270 {
271 /* We handle IDP and deltas */
272 if ((nid == NID_issuing_distribution_point)
273 || (nid == NID_authority_key_identifier)
274 || (nid == NID_delta_crl))
275 break;;
276 crl->flags |= EXFLAG_CRITICAL;
277 break;
278 }
279 }
280
281
282 if (!crl_set_issuers(crl))
283 return 0;
284
285 if (crl->meth->crl_init)
286 {
287 if (crl->meth->crl_init(crl) == 0)
288 return 0;
289 }
290 break;
291
292 case ASN1_OP_FREE_POST:
293 if (crl->meth->crl_free)
294 {
295 if (!crl->meth->crl_free(crl))
296 return 0;
297 }
298 if (crl->akid)
299 AUTHORITY_KEYID_free(crl->akid);
300 if (crl->idp)
301 ISSUING_DIST_POINT_free(crl->idp);
302 ASN1_INTEGER_free(crl->crl_number);
303 ASN1_INTEGER_free(crl->base_crl_number);
304 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
305 break;
306 }
307 return 1;
308 }
309
310 /* Convert IDP into a more convenient form */
311
312 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
313 {
314 int idp_only = 0;
315 /* Set various flags according to IDP */
316 crl->idp_flags |= IDP_PRESENT;
317 if (idp->onlyuser > 0)
318 {
319 idp_only++;
320 crl->idp_flags |= IDP_ONLYUSER;
321 }
322 if (idp->onlyCA > 0)
323 {
324 idp_only++;
325 crl->idp_flags |= IDP_ONLYCA;
326 }
327 if (idp->onlyattr > 0)
328 {
329 idp_only++;
330 crl->idp_flags |= IDP_ONLYATTR;
331 }
332
333 if (idp_only > 1)
334 crl->idp_flags |= IDP_INVALID;
335
336 if (idp->indirectCRL > 0)
337 crl->idp_flags |= IDP_INDIRECT;
338
339 if (idp->onlysomereasons)
340 {
341 crl->idp_flags |= IDP_REASONS;
342 if (idp->onlysomereasons->length > 0)
343 crl->idp_reasons = idp->onlysomereasons->data[0];
344 if (idp->onlysomereasons->length > 1)
345 crl->idp_reasons |=
346 (idp->onlysomereasons->data[1] << 8);
347 crl->idp_reasons &= CRLDP_ALL_REASONS;
348 }
349
350 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
351 }
352
353 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
354 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
355 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
356 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
357 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
358
359 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
360 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
361 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
362 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
363
364 static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
365 const X509_REVOKED * const *b)
366 {
367 return(ASN1_STRING_cmp(
368 (ASN1_STRING *)(*a)->serialNumber,
369 (ASN1_STRING *)(*b)->serialNumber));
370 }
371
372 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
373 {
374 X509_CRL_INFO *inf;
375 inf = crl->crl;
376 if(!inf->revoked)
377 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
378 if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
379 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
380 return 0;
381 }
382 inf->enc.modified = 1;
383 return 1;
384 }
385
386 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
387 {
388 if (crl->meth->crl_verify)
389 return crl->meth->crl_verify(crl, r);
390 return 0;
391 }
392
393 int X509_CRL_get0_by_serial(X509_CRL *crl,
394 X509_REVOKED **ret, ASN1_INTEGER *serial)
395 {
396 if (crl->meth->crl_lookup)
397 return crl->meth->crl_lookup(crl, ret, serial, NULL);
398 return 0;
399 }
400
401 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
402 {
403 if (crl->meth->crl_lookup)
404 return crl->meth->crl_lookup(crl, ret,
405 X509_get_serialNumber(x),
406 X509_get_issuer_name(x));
407 return 0;
408 }
409
410 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
411 {
412 return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
413 crl->sig_alg, crl->signature,crl->crl,r));
414 }
415
416 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
417 X509_REVOKED *rev)
418 {
419 int i;
420
421 if (!rev->issuer)
422 {
423 if (!nm)
424 return 1;
425 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
426 return 1;
427 return 0;
428 }
429
430 if (!nm)
431 nm = X509_CRL_get_issuer(crl);
432
433 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
434 {
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
445 static int def_crl_lookup(X509_CRL *crl,
446 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
447 {
448 X509_REVOKED rtmp, *rev;
449 int idx;
450 rtmp.serialNumber = serial;
451 /* Sort revoked into serial number order if not already sorted.
452 * Do this under a lock to avoid race condition.
453 */
454 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
455 {
456 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
457 sk_X509_REVOKED_sort(crl->crl->revoked);
458 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
459 }
460 idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
461 if(idx < 0)
462 return 0;
463 /* Need to look for matching name */
464 for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
465 {
466 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
467 if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
468 return 0;
469 if (crl_revoked_issuer_match(crl, issuer, rev))
470 {
471 if (ret)
472 *ret = rev;
473 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
474 return 2;
475 return 1;
476 }
477 }
478 return 0;
479 }
480
481 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
482 {
483 if (meth == NULL)
484 default_crl_method = &int_crl_meth;
485 else
486 default_crl_method = meth;
487 }
488
489 X509_CRL_METHOD *X509_CRL_METHOD_new(
490 int (*crl_init)(X509_CRL *crl),
491 int (*crl_free)(X509_CRL *crl),
492 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
493 ASN1_INTEGER *ser, X509_NAME *issuer),
494 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
495 {
496 X509_CRL_METHOD *m;
497 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
498 if (!m)
499 return NULL;
500 m->crl_init = crl_init;
501 m->crl_free = crl_free;
502 m->crl_lookup = crl_lookup;
503 m->crl_verify = crl_verify;
504 m->flags = X509_CRL_METHOD_DYNAMIC;
505 return m;
506 }
507
508 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
509 {
510 if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
511 return;
512 OPENSSL_free(m);
513 }
514
515 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
516 {
517 crl->meth_data = dat;
518 }
519
520 void *X509_CRL_get_meth_data(X509_CRL *crl)
521 {
522 return crl->meth_data;
523 }
524
525 IMPLEMENT_STACK_OF(X509_REVOKED)
526 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
527 IMPLEMENT_STACK_OF(X509_CRL)
528 IMPLEMENT_ASN1_SET_OF(X509_CRL)