Initial support for delta CRLs. If "use deltas" flag is set attempt to find
[openssl.git] / crypto / asn1 / x_crl.c
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)