• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 #include <openssl/asn1.h>
58 #include <openssl/asn1t.h>
59 #include <openssl/digest.h>
60 #include <openssl/err.h>
61 #include <openssl/mem.h>
62 #include <openssl/obj.h>
63 #include <openssl/stack.h>
64 #include <openssl/thread.h>
65 #include <openssl/x509.h>
66 #include <openssl/x509v3.h>
67 
68 #include "../internal.h"
69 
70 /*
71  * Method to handle CRL access. In general a CRL could be very large (several
72  * Mb) and can consume large amounts of resources if stored in memory by
73  * multiple processes. This method allows general CRL operations to be
74  * redirected to more efficient callbacks: for example a CRL entry database.
75  */
76 
77 #define X509_CRL_METHOD_DYNAMIC         1
78 
79 struct x509_crl_method_st {
80     int flags;
81     int (*crl_init) (X509_CRL *crl);
82     int (*crl_free) (X509_CRL *crl);
83     int (*crl_lookup) (X509_CRL *crl, X509_REVOKED **ret,
84                        ASN1_INTEGER *ser, X509_NAME *issuer);
85     int (*crl_verify) (X509_CRL *crl, EVP_PKEY *pk);
86 };
87 
88 static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b);
89 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
90 
91 ASN1_SEQUENCE(X509_REVOKED) = {
92         ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER),
93         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
94         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
95 } ASN1_SEQUENCE_END(X509_REVOKED)
96 
97 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
98 static int def_crl_lookup(X509_CRL *crl,
99                           X509_REVOKED **ret, ASN1_INTEGER *serial,
100                           X509_NAME *issuer);
101 
102 static const X509_CRL_METHOD int_crl_meth = {
103     0,
104     0, 0,
105     def_crl_lookup,
106     def_crl_verify
107 };
108 
109 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
110 
111 /*
112  * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
113  * the original encoding the signature wont be affected by reordering of the
114  * revoked field.
115  */
crl_inf_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)116 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
117                       void *exarg)
118 {
119     X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
120 
121     if (!a || !a->revoked)
122         return 1;
123     switch (operation) {
124         /*
125          * Just set cmp function here. We don't sort because that would
126          * affect the output of X509_CRL_print().
127          */
128     case ASN1_OP_D2I_POST:
129         (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
130         break;
131     }
132     return 1;
133 }
134 
135 
136 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
137         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
138         ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR),
139         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
140         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
141         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
142         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
143         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
144 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
145 
146 /*
147  * Set CRL entry issuer according to CRL certificate issuer extension. Check
148  * for unhandled critical CRL entry extensions.
149  */
150 
151 static int crl_set_issuers(X509_CRL *crl)
152 {
153 
154     size_t i, k;
155     int j;
156     GENERAL_NAMES *gens, *gtmp;
157     STACK_OF(X509_REVOKED) *revoked;
158 
159     revoked = X509_CRL_get_REVOKED(crl);
160 
161     gens = NULL;
162     for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
163         X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
164         STACK_OF(X509_EXTENSION) *exts;
165         ASN1_ENUMERATED *reason;
166         X509_EXTENSION *ext;
167         gtmp = X509_REVOKED_get_ext_d2i(rev,
168                                         NID_certificate_issuer, &j, NULL);
169         if (!gtmp && (j != -1)) {
170             crl->flags |= EXFLAG_INVALID;
171             return 1;
172         }
173 
174         if (gtmp) {
175             gens = gtmp;
176             if (!crl->issuers) {
177                 crl->issuers = sk_GENERAL_NAMES_new_null();
178                 if (!crl->issuers)
179                     return 0;
180             }
181             if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
182                 return 0;
183         }
184         rev->issuer = gens;
185 
186         reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
187         if (!reason && (j != -1)) {
188             crl->flags |= EXFLAG_INVALID;
189             return 1;
190         }
191 
192         if (reason) {
193             rev->reason = ASN1_ENUMERATED_get(reason);
194             ASN1_ENUMERATED_free(reason);
195         } else
196             rev->reason = CRL_REASON_NONE;
197 
198         /* Check for critical CRL entry extensions */
199 
200         exts = rev->extensions;
201 
202         for (k = 0; k < sk_X509_EXTENSION_num(exts); k++) {
203             ext = sk_X509_EXTENSION_value(exts, k);
204             if (ext->critical > 0) {
205                 if (OBJ_obj2nid(ext->object) == NID_certificate_issuer)
206                     continue;
207                 crl->flags |= EXFLAG_CRITICAL;
208                 break;
209             }
210         }
211 
212     }
213 
214     return 1;
215 
216 }
217 
218 /*
219  * The X509_CRL structure needs a bit of customisation. Cache some extensions
220  * and hash of the whole CRL.
221  */
crl_cb(int operation,ASN1_VALUE ** pval,const ASN1_ITEM * it,void * exarg)222 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
223                   void *exarg)
224 {
225     X509_CRL *crl = (X509_CRL *)*pval;
226     STACK_OF(X509_EXTENSION) *exts;
227     X509_EXTENSION *ext;
228     size_t idx;
229 
230     switch (operation) {
231     case ASN1_OP_NEW_POST:
232         crl->idp = NULL;
233         crl->akid = NULL;
234         crl->flags = 0;
235         crl->idp_flags = 0;
236         crl->idp_reasons = CRLDP_ALL_REASONS;
237         crl->meth = default_crl_method;
238         crl->meth_data = NULL;
239         crl->issuers = NULL;
240         crl->crl_number = NULL;
241         crl->base_crl_number = NULL;
242         break;
243 
244     case ASN1_OP_D2I_POST:
245         X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
246         crl->idp = X509_CRL_get_ext_d2i(crl,
247                                         NID_issuing_distribution_point, NULL,
248                                         NULL);
249         if (crl->idp)
250             setup_idp(crl, crl->idp);
251 
252         crl->akid = X509_CRL_get_ext_d2i(crl,
253                                          NID_authority_key_identifier, NULL,
254                                          NULL);
255 
256         crl->crl_number = X509_CRL_get_ext_d2i(crl,
257                                                NID_crl_number, NULL, NULL);
258 
259         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
260                                                     NID_delta_crl, NULL,
261                                                     NULL);
262         /* Delta CRLs must have CRL number */
263         if (crl->base_crl_number && !crl->crl_number)
264             crl->flags |= EXFLAG_INVALID;
265 
266         /*
267          * See if we have any unhandled critical CRL extensions and indicate
268          * this in a flag. We only currently handle IDP so anything else
269          * critical sets the flag. This code accesses the X509_CRL structure
270          * directly: applications shouldn't do this.
271          */
272 
273         exts = crl->crl->extensions;
274 
275         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
276             int nid;
277             ext = sk_X509_EXTENSION_value(exts, idx);
278             nid = OBJ_obj2nid(ext->object);
279             if (nid == NID_freshest_crl)
280                 crl->flags |= EXFLAG_FRESHEST;
281             if (ext->critical > 0) {
282                 /* We handle IDP and deltas */
283                 if ((nid == NID_issuing_distribution_point)
284                     || (nid == NID_authority_key_identifier)
285                     || (nid == NID_delta_crl))
286                     continue;
287                 crl->flags |= EXFLAG_CRITICAL;
288                 break;
289             }
290         }
291 
292         if (!crl_set_issuers(crl))
293             return 0;
294 
295         if (crl->meth->crl_init) {
296             if (crl->meth->crl_init(crl) == 0)
297                 return 0;
298         }
299         break;
300 
301     case ASN1_OP_FREE_POST:
302         /* |crl->meth| may be NULL if constructing the object failed before
303          * |ASN1_OP_NEW_POST| was run. */
304         if (crl->meth && crl->meth->crl_free) {
305             if (!crl->meth->crl_free(crl))
306                 return 0;
307         }
308         if (crl->akid)
309             AUTHORITY_KEYID_free(crl->akid);
310         if (crl->idp)
311             ISSUING_DIST_POINT_free(crl->idp);
312         ASN1_INTEGER_free(crl->crl_number);
313         ASN1_INTEGER_free(crl->base_crl_number);
314         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
315         break;
316     }
317     return 1;
318 }
319 
320 /* Convert IDP into a more convenient form */
321 
setup_idp(X509_CRL * crl,ISSUING_DIST_POINT * idp)322 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
323 {
324     int idp_only = 0;
325     /* Set various flags according to IDP */
326     crl->idp_flags |= IDP_PRESENT;
327     if (idp->onlyuser > 0) {
328         idp_only++;
329         crl->idp_flags |= IDP_ONLYUSER;
330     }
331     if (idp->onlyCA > 0) {
332         idp_only++;
333         crl->idp_flags |= IDP_ONLYCA;
334     }
335     if (idp->onlyattr > 0) {
336         idp_only++;
337         crl->idp_flags |= IDP_ONLYATTR;
338     }
339 
340     if (idp_only > 1)
341         crl->idp_flags |= IDP_INVALID;
342 
343     if (idp->indirectCRL > 0)
344         crl->idp_flags |= IDP_INDIRECT;
345 
346     if (idp->onlysomereasons) {
347         crl->idp_flags |= IDP_REASONS;
348         if (idp->onlysomereasons->length > 0)
349             crl->idp_reasons = idp->onlysomereasons->data[0];
350         if (idp->onlysomereasons->length > 1)
351             crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
352         crl->idp_reasons &= CRLDP_ALL_REASONS;
353     }
354 
355     DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
356 }
357 
358 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
359         ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
360         ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
361         ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
362 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
363 
364 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
365 
366 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
367 
368 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
369 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
370 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
371 
372 static int X509_REVOKED_cmp(const X509_REVOKED **a, const X509_REVOKED **b)
373 {
374     return (ASN1_STRING_cmp((ASN1_STRING *)(*a)->serialNumber,
375                             (ASN1_STRING *)(*b)->serialNumber));
376 }
377 
X509_CRL_add0_revoked(X509_CRL * crl,X509_REVOKED * rev)378 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
379 {
380     X509_CRL_INFO *inf;
381     inf = crl->crl;
382     if (!inf->revoked)
383         inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
384     if (!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
385         OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
386         return 0;
387     }
388     inf->enc.modified = 1;
389     return 1;
390 }
391 
X509_CRL_verify(X509_CRL * crl,EVP_PKEY * r)392 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
393 {
394     if (crl->meth->crl_verify)
395         return crl->meth->crl_verify(crl, r);
396     return 0;
397 }
398 
X509_CRL_get0_by_serial(X509_CRL * crl,X509_REVOKED ** ret,ASN1_INTEGER * serial)399 int X509_CRL_get0_by_serial(X509_CRL *crl,
400                             X509_REVOKED **ret, ASN1_INTEGER *serial)
401 {
402     if (crl->meth->crl_lookup)
403         return crl->meth->crl_lookup(crl, ret, serial, NULL);
404     return 0;
405 }
406 
X509_CRL_get0_by_cert(X509_CRL * crl,X509_REVOKED ** ret,X509 * x)407 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
408 {
409     if (crl->meth->crl_lookup)
410         return crl->meth->crl_lookup(crl, ret,
411                                      X509_get_serialNumber(x),
412                                      X509_get_issuer_name(x));
413     return 0;
414 }
415 
def_crl_verify(X509_CRL * crl,EVP_PKEY * r)416 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
417 {
418     return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
419                              crl->sig_alg, crl->signature, crl->crl, r));
420 }
421 
crl_revoked_issuer_match(X509_CRL * crl,X509_NAME * nm,X509_REVOKED * rev)422 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
423                                     X509_REVOKED *rev)
424 {
425     size_t i;
426 
427     if (!rev->issuer) {
428         if (!nm)
429             return 1;
430         if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
431             return 1;
432         return 0;
433     }
434 
435     if (!nm)
436         nm = X509_CRL_get_issuer(crl);
437 
438     for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
439         GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
440         if (gen->type != GEN_DIRNAME)
441             continue;
442         if (!X509_NAME_cmp(nm, gen->d.directoryName))
443             return 1;
444     }
445     return 0;
446 
447 }
448 
449 static struct CRYPTO_STATIC_MUTEX g_crl_sort_lock = CRYPTO_STATIC_MUTEX_INIT;
450 
def_crl_lookup(X509_CRL * crl,X509_REVOKED ** ret,ASN1_INTEGER * serial,X509_NAME * issuer)451 static int def_crl_lookup(X509_CRL *crl,
452                           X509_REVOKED **ret, ASN1_INTEGER *serial,
453                           X509_NAME *issuer)
454 {
455     X509_REVOKED rtmp, *rev;
456     size_t idx;
457     rtmp.serialNumber = serial;
458     /*
459      * Sort revoked into serial number order if not already sorted. Do this
460      * under a lock to avoid race condition.
461      */
462 
463     CRYPTO_STATIC_MUTEX_lock_read(&g_crl_sort_lock);
464     const int is_sorted = sk_X509_REVOKED_is_sorted(crl->crl->revoked);
465     CRYPTO_STATIC_MUTEX_unlock_read(&g_crl_sort_lock);
466 
467     if (!is_sorted) {
468         CRYPTO_STATIC_MUTEX_lock_write(&g_crl_sort_lock);
469         if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) {
470             sk_X509_REVOKED_sort(crl->crl->revoked);
471         }
472         CRYPTO_STATIC_MUTEX_unlock_write(&g_crl_sort_lock);
473     }
474 
475     if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp))
476         return 0;
477     /* Need to look for matching name */
478     for (; idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) {
479         rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
480         if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
481             return 0;
482         if (crl_revoked_issuer_match(crl, issuer, rev)) {
483             if (ret)
484                 *ret = rev;
485             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
486                 return 2;
487             return 1;
488         }
489     }
490     return 0;
491 }
492 
X509_CRL_set_default_method(const X509_CRL_METHOD * meth)493 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
494 {
495     if (meth == NULL)
496         default_crl_method = &int_crl_meth;
497     else
498         default_crl_method = meth;
499 }
500 
X509_CRL_METHOD_new(int (* crl_init)(X509_CRL * crl),int (* crl_free)(X509_CRL * crl),int (* crl_lookup)(X509_CRL * crl,X509_REVOKED ** ret,ASN1_INTEGER * ser,X509_NAME * issuer),int (* crl_verify)(X509_CRL * crl,EVP_PKEY * pk))501 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
502                                      int (*crl_free) (X509_CRL *crl),
503                                      int (*crl_lookup) (X509_CRL *crl,
504                                                         X509_REVOKED **ret,
505                                                         ASN1_INTEGER *ser,
506                                                         X509_NAME *issuer),
507                                      int (*crl_verify) (X509_CRL *crl,
508                                                         EVP_PKEY *pk))
509 {
510     X509_CRL_METHOD *m;
511     m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
512     if (!m)
513         return NULL;
514     m->crl_init = crl_init;
515     m->crl_free = crl_free;
516     m->crl_lookup = crl_lookup;
517     m->crl_verify = crl_verify;
518     m->flags = X509_CRL_METHOD_DYNAMIC;
519     return m;
520 }
521 
X509_CRL_METHOD_free(X509_CRL_METHOD * m)522 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
523 {
524     if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
525         return;
526     OPENSSL_free(m);
527 }
528 
X509_CRL_set_meth_data(X509_CRL * crl,void * dat)529 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
530 {
531     crl->meth_data = dat;
532 }
533 
X509_CRL_get_meth_data(X509_CRL * crl)534 void *X509_CRL_get_meth_data(X509_CRL *crl)
535 {
536     return crl->meth_data;
537 }
538 
539 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
540 
541 IMPLEMENT_ASN1_SET_OF(X509_CRL)
542