Initial indirect CRL support.
[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
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24  * modification, are permitted provided that the following conditions
25  * are met:
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30  *    documentation and/or other materials provided with the distribution.
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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 :-).
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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
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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.
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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                 X509_EXTENSION *ext;
141                 gtmp = X509_REVOKED_get_ext_d2i(rev, 
142                                                 NID_certificate_issuer,
143                                                 &j, NULL);
144                 if (!gtmp && (j != -1))
145                         {
146                         crl->flags |= EXFLAG_INVALID;
147                         return 1;
148                         }
149
150                 if (gtmp)
151                         {
152                         gens = gtmp;
153                         if (!crl->issuers)
154                                 {
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                 /* Check for critical CRL entry extensions */
165
166                 exts = rev->extensions;
167
168                 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
169                         {
170                         ext = sk_X509_EXTENSION_value(exts, j);
171                         if (ext->critical > 0)
172                                 {
173                                 if (OBJ_obj2nid(ext->object) ==
174                                         NID_certificate_issuer)
175                                         continue;
176                                 crl->flags |= EXFLAG_CRITICAL;
177                                 break;
178                                 }
179                         }
180
181
182                 }
183
184         return 1;
185
186         }
187
188 /* The X509_CRL structure needs a bit of customisation. Cache some extensions
189  * and hash of the whole CRL.
190  */
191 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
192                                                                 void *exarg)
193         {
194         X509_CRL *crl = (X509_CRL *)*pval;
195         STACK_OF(X509_EXTENSION) *exts;
196         X509_EXTENSION *ext;
197         int idx;
198
199         switch(operation)
200                 {
201                 case ASN1_OP_NEW_POST:
202                 crl->idp = NULL;
203                 crl->akid = NULL;
204                 crl->flags = 0;
205                 crl->idp_flags = 0;
206                 crl->meth = default_crl_method;
207                 crl->meth_data = NULL;
208                 crl->issuers = NULL;
209                 break;
210
211                 case ASN1_OP_D2I_POST:
212 #ifndef OPENSSL_NO_SHA
213                 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
214 #endif
215                 crl->idp = X509_CRL_get_ext_d2i(crl,
216                                 NID_issuing_distribution_point, NULL, NULL);
217                 if (crl->idp)
218                         setup_idp(crl, crl->idp);
219
220                 crl->akid = X509_CRL_get_ext_d2i(crl,
221                                 NID_authority_key_identifier, NULL, NULL);      
222
223                 /* See if we have any unhandled critical CRL extensions and 
224                  * indicate this in a flag. We only currently handle IDP so
225                  * anything else critical sets the flag.
226                  *
227                  * This code accesses the X509_CRL structure directly:
228                  * 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                         {
235                         ext = sk_X509_EXTENSION_value(exts, idx);
236                         if (ext->critical > 0)
237                                 {
238                                 /* We handle IDP now so permit it */
239                                 if (OBJ_obj2nid(ext->object) ==
240                                         NID_issuing_distribution_point)
241                                         continue;
242                                 crl->flags |= EXFLAG_CRITICAL;
243                                 break;
244                                 }
245                         }
246
247
248                 if (!crl_set_issuers(crl))
249                         return 0;
250
251                 if (crl->meth->crl_init)
252                         {
253                         if (crl->meth->crl_init(crl) == 0)
254                                 return 0;
255                         }
256                 break;
257
258                 case ASN1_OP_FREE_POST:
259                 if (crl->meth->crl_free)
260                         {
261                         if (!crl->meth->crl_free(crl))
262                                 return 0;
263                         }
264                 if (crl->akid)
265                         AUTHORITY_KEYID_free(crl->akid);
266                 if (crl->idp)
267                         ISSUING_DIST_POINT_free(crl->idp);
268                 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
269                 break;
270                 }
271         return 1;
272         }
273
274 /* Convert IDP into a more convenient form */
275
276 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
277         {
278         int idp_only = 0;
279         /* Set various flags according to IDP */
280         crl->idp_flags |= IDP_PRESENT;
281         if (idp->onlyuser > 0)
282                 {
283                 idp_only++;
284                 crl->idp_flags |= IDP_ONLYUSER;
285                 }
286         if (idp->onlyCA > 0)
287                 {
288                 idp_only++;
289                 crl->idp_flags |= IDP_ONLYCA;
290                 }
291         if (idp->onlyattr > 0)
292                 {
293                 idp_only++;
294                 crl->idp_flags |= IDP_ONLYATTR;
295                 }
296
297         if (idp_only > 1)
298                 crl->idp_flags |= IDP_INVALID;
299
300         if (idp->indirectCRL > 0)
301                 crl->idp_flags |= IDP_INDIRECT;
302
303         if (idp->onlysomereasons)
304                 {
305                 crl->idp_flags |= IDP_REASONS;
306                 if (idp->onlysomereasons->length > 0)
307                         crl->idp_reasons = idp->onlysomereasons->data[0];
308                 if (idp->onlysomereasons->length > 1)
309                         crl->idp_reasons |=
310                                 (idp->onlysomereasons->data[1] << 8);
311                 }
312
313         DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
314         }
315
316 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
317         ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
318         ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
319         ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
320 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
321
322 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
323 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
324 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
325 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
326
327 static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
328                         const X509_REVOKED * const *b)
329         {
330         return(ASN1_STRING_cmp(
331                 (ASN1_STRING *)(*a)->serialNumber,
332                 (ASN1_STRING *)(*b)->serialNumber));
333         }
334
335 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
336 {
337         X509_CRL_INFO *inf;
338         inf = crl->crl;
339         if(!inf->revoked)
340                 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
341         if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
342                 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
343                 return 0;
344         }
345         inf->enc.modified = 1;
346         return 1;
347 }
348
349 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
350         {
351         if (crl->meth->crl_verify)
352                 return crl->meth->crl_verify(crl, r);
353         return 0;
354         }
355
356 int X509_CRL_get0_by_serial(X509_CRL *crl,
357                 X509_REVOKED **ret, ASN1_INTEGER *serial)
358         {
359         if (crl->meth->crl_lookup)
360                 return crl->meth->crl_lookup(crl, ret, serial, NULL);
361         return 0;
362         }
363
364 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
365         {
366         if (crl->meth->crl_lookup)
367                 return crl->meth->crl_lookup(crl, ret,
368                                                 X509_get_serialNumber(x),
369                                                 X509_get_issuer_name(x));
370         return 0;
371         }
372
373 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
374         {
375         return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
376                 crl->sig_alg, crl->signature,crl->crl,r));
377         }
378
379 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
380                                                 X509_REVOKED *rev)
381         {
382         int i;
383
384         if (!rev->issuer)
385                 {
386                 if (!nm)
387                         return 1;
388                 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
389                         return 1;
390                 return 0;
391                 }
392
393         if (!nm)
394                 nm = X509_CRL_get_issuer(crl);
395
396         for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
397                 {
398                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
399                 if (gen->type != GEN_DIRNAME)
400                         continue;
401                 if (!X509_NAME_cmp(nm, gen->d.directoryName))
402                         return 1;
403                 }
404         return 0;
405
406         }
407
408 static int def_crl_lookup(X509_CRL *crl,
409                 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
410         {
411         X509_REVOKED rtmp, *rev;
412         int idx;
413         rtmp.serialNumber = serial;
414         /* Sort revoked into serial number order if not already sorted.
415          * Do this under a lock to avoid race condition.
416          */
417         if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
418                 {
419                 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
420                 sk_X509_REVOKED_sort(crl->crl->revoked);
421                 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
422                 }
423         idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
424         if(idx < 0)
425                 return 0;
426         /* Need to look for matching name */
427         for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
428                 {
429                 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
430                 if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
431                         return 0;
432                 if (crl_revoked_issuer_match(crl, issuer, rev))
433                         {
434                         if (ret)
435                                 *ret = rev;
436                         return 1;
437                         }
438                 }
439         return 0;
440         }
441
442 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
443         {
444         if (meth == NULL)
445                 default_crl_method = &int_crl_meth;
446         else 
447                 default_crl_method = meth;
448         }
449
450 X509_CRL_METHOD *X509_CRL_METHOD_new(
451         int (*crl_init)(X509_CRL *crl),
452         int (*crl_free)(X509_CRL *crl),
453         int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
454                                 ASN1_INTEGER *ser, X509_NAME *issuer),
455         int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
456         {
457         X509_CRL_METHOD *m;
458         m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
459         if (!m)
460                 return NULL;
461         m->crl_init = crl_init;
462         m->crl_free = crl_free;
463         m->crl_lookup = crl_lookup;
464         m->crl_verify = crl_verify;
465         m->flags = X509_CRL_METHOD_DYNAMIC;
466         return m;
467         }
468
469 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
470         {
471         if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
472                 return;
473         OPENSSL_free(m);
474         }
475
476 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
477         {
478         crl->meth_data = dat;
479         }
480
481 void *X509_CRL_get_meth_data(X509_CRL *crl)
482         {
483         return crl->meth_data;
484         }
485
486 IMPLEMENT_STACK_OF(X509_REVOKED)
487 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
488 IMPLEMENT_STACK_OF(X509_CRL)
489 IMPLEMENT_ASN1_SET_OF(X509_CRL)