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_delta_crl))
274 break;;
275 crl->flags |= EXFLAG_CRITICAL;
276 break;
277 }
278 }
279
280
281 if (!crl_set_issuers(crl))
282 return 0;
283
284 if (crl->meth->crl_init)
285 {
286 if (crl->meth->crl_init(crl) == 0)
287 return 0;
288 }
289 break;
290
291 case ASN1_OP_FREE_POST:
292 if (crl->meth->crl_free)
293 {
294 if (!crl->meth->crl_free(crl))
295 return 0;
296 }
297 if (crl->akid)
298 AUTHORITY_KEYID_free(crl->akid);
299 if (crl->idp)
300 ISSUING_DIST_POINT_free(crl->idp);
301 ASN1_INTEGER_free(crl->crl_number);
302 ASN1_INTEGER_free(crl->base_crl_number);
303 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
304 break;
305 }
306 return 1;
307 }
308
309 /* Convert IDP into a more convenient form */
310
311 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
312 {
313 int idp_only = 0;
314 /* Set various flags according to IDP */
315 crl->idp_flags |= IDP_PRESENT;
316 if (idp->onlyuser > 0)
317 {
318 idp_only++;
319 crl->idp_flags |= IDP_ONLYUSER;
320 }
321 if (idp->onlyCA > 0)
322 {
323 idp_only++;
324 crl->idp_flags |= IDP_ONLYCA;
325 }
326 if (idp->onlyattr > 0)
327 {
328 idp_only++;
329 crl->idp_flags |= IDP_ONLYATTR;
330 }
331
332 if (idp_only > 1)
333 crl->idp_flags |= IDP_INVALID;
334
335 if (idp->indirectCRL > 0)
336 crl->idp_flags |= IDP_INDIRECT;
337
338 if (idp->onlysomereasons)
339 {
340 crl->idp_flags |= IDP_REASONS;
341 if (idp->onlysomereasons->length > 0)
342 crl->idp_reasons = idp->onlysomereasons->data[0];
343 if (idp->onlysomereasons->length > 1)
344 crl->idp_reasons |=
345 (idp->onlysomereasons->data[1] << 8);
346 crl->idp_reasons &= CRLDP_ALL_REASONS;
347 }
348
349 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
350 }
351
352 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
353 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
354 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
355 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
356 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
357
358 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
359 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
360 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
361 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
362
363 static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
364 const X509_REVOKED * const *b)
365 {
366 return(ASN1_STRING_cmp(
367 (ASN1_STRING *)(*a)->serialNumber,
368 (ASN1_STRING *)(*b)->serialNumber));
369 }
370
371 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
372 {
373 X509_CRL_INFO *inf;
374 inf = crl->crl;
375 if(!inf->revoked)
376 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
377 if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
378 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
379 return 0;
380 }
381 inf->enc.modified = 1;
382 return 1;
383 }
384
385 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
386 {
387 if (crl->meth->crl_verify)
388 return crl->meth->crl_verify(crl, r);
389 return 0;
390 }
391
392 int X509_CRL_get0_by_serial(X509_CRL *crl,
393 X509_REVOKED **ret, ASN1_INTEGER *serial)
394 {
395 if (crl->meth->crl_lookup)
396 return crl->meth->crl_lookup(crl, ret, serial, NULL);
397 return 0;
398 }
399
400 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
401 {
402 if (crl->meth->crl_lookup)
403 return crl->meth->crl_lookup(crl, ret,
404 X509_get_serialNumber(x),
405 X509_get_issuer_name(x));
406 return 0;
407 }
408
409 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
410 {
411 return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
412 crl->sig_alg, crl->signature,crl->crl,r));
413 }
414
415 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
416 X509_REVOKED *rev)
417 {
418 int i;
419
420 if (!rev->issuer)
421 {
422 if (!nm)
423 return 1;
424 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
425 return 1;
426 return 0;
427 }
428
429 if (!nm)
430 nm = X509_CRL_get_issuer(crl);
431
432 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
433 {
434 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
435 if (gen->type != GEN_DIRNAME)
436 continue;
437 if (!X509_NAME_cmp(nm, gen->d.directoryName))
438 return 1;
439 }
440 return 0;
441
442 }
443
444 static int def_crl_lookup(X509_CRL *crl,
445 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
446 {
447 X509_REVOKED rtmp, *rev;
448 int idx;
449 rtmp.serialNumber = serial;
450 /* Sort revoked into serial number order if not already sorted.
451 * Do this under a lock to avoid race condition.
452 */
453 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
454 {
455 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
456 sk_X509_REVOKED_sort(crl->crl->revoked);
457 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
458 }
459 idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
460 if(idx < 0)
461 return 0;
462 /* Need to look for matching name */
463 for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
464 {
465 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
466 if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
467 return 0;
468 if (crl_revoked_issuer_match(crl, issuer, rev))
469 {
470 if (ret)
471 *ret = rev;
472 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
473 return 2;
474 return 1;
475 }
476 }
477 return 0;
478 }
479
480 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
481 {
482 if (meth == NULL)
483 default_crl_method = &int_crl_meth;
484 else
485 default_crl_method = meth;
486 }
487
488 X509_CRL_METHOD *X509_CRL_METHOD_new(
489 int (*crl_init)(X509_CRL *crl),
490 int (*crl_free)(X509_CRL *crl),
491 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
492 ASN1_INTEGER *ser, X509_NAME *issuer),
493 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
494 {
495 X509_CRL_METHOD *m;
496 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
497 if (!m)
498 return NULL;
499 m->crl_init = crl_init;
500 m->crl_free = crl_free;
501 m->crl_lookup = crl_lookup;
502 m->crl_verify = crl_verify;
503 m->flags = X509_CRL_METHOD_DYNAMIC;
504 return m;
505 }
506
507 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
508 {
509 if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
510 return;
511 OPENSSL_free(m);
512 }
513
514 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
515 {
516 crl->meth_data = dat;
517 }
518
519 void *X509_CRL_get_meth_data(X509_CRL *crl)
520 {
521 return crl->meth_data;
522 }
523
524 IMPLEMENT_STACK_OF(X509_REVOKED)
525 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
526 IMPLEMENT_STACK_OF(X509_CRL)
527 IMPLEMENT_ASN1_SET_OF(X509_CRL)