0381c4a5028543d7473a5d281a235728a4299189
[openssl.git] / crypto / x509 / x509_vfy.c
1 /* crypto/x509/x509_vfy.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 <time.h>
61 #include <errno.h>
62
63 #include "cryptlib.h"
64 #include <openssl/crypto.h>
65 #include <openssl/lhash.h>
66 #include <openssl/buffer.h>
67 #include <openssl/evp.h>
68 #include <openssl/asn1.h>
69 #include <openssl/x509.h>
70 #include <openssl/x509v3.h>
71 #include <openssl/objects.h>
72
73 /* CRL score values */
74
75 /* No unhandled critical extensions */
76
77 #define CRL_SCORE_NOCRITICAL    0x100
78
79 /* certificate is within CRL scope */
80
81 #define CRL_SCORE_SCOPE         0x080
82
83 /* CRL times valid */
84
85 #define CRL_SCORE_TIME          0x040
86
87 /* Issuer name matches certificate */
88
89 #define CRL_SCORE_ISSUER_NAME   0x020
90
91 /* If this score or above CRL is probably valid */
92
93 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
94
95 /* CRL issuer is certificate issuer */
96
97 #define CRL_SCORE_ISSUER_CERT   0x018
98
99 /* CRL issuer is on certificate path */
100
101 #define CRL_SCORE_SAME_PATH     0x008
102
103 /* CRL issuer matches CRL AKID */
104
105 #define CRL_SCORE_AKID          0x004
106
107 /* Have a delta CRL with valid times */
108
109 #define CRL_SCORE_TIME_DELTA    0x002
110
111 static int null_callback(int ok,X509_STORE_CTX *e);
112 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
113 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
114 static int check_chain_extensions(X509_STORE_CTX *ctx);
115 static int check_name_constraints(X509_STORE_CTX *ctx);
116 static int check_trust(X509_STORE_CTX *ctx);
117 static int check_revocation(X509_STORE_CTX *ctx);
118 static int check_cert(X509_STORE_CTX *ctx);
119 static int check_policy(X509_STORE_CTX *ctx);
120
121 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
122                         unsigned int *preasons,
123                         X509_CRL *crl, X509 *x);
124 static int get_crl_delta(X509_STORE_CTX *ctx,
125                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
126 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pcrl_score,
127                         X509_CRL *base, STACK_OF(X509_CRL) *crls);
128 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
129                                 X509 **pissuer, int *pcrl_score);
130 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
131                                 unsigned int *preasons);
132 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
133 static int check_crl_chain(X509_STORE_CTX *ctx,
134                         STACK_OF(X509) *cert_path,
135                         STACK_OF(X509) *crl_path);
136
137 static int internal_verify(X509_STORE_CTX *ctx);
138 const char X509_version[]="X.509" OPENSSL_VERSION_PTEXT;
139
140
141 static int null_callback(int ok, X509_STORE_CTX *e)
142         {
143         return ok;
144         }
145
146 #if 0
147 static int x509_subject_cmp(X509 **a, X509 **b)
148         {
149         return X509_subject_name_cmp(*a,*b);
150         }
151 #endif
152
153 int X509_verify_cert(X509_STORE_CTX *ctx)
154         {
155         X509 *x,*xtmp,*chain_ss=NULL;
156         int bad_chain = 0;
157         X509_VERIFY_PARAM *param = ctx->param;
158         int depth,i,ok=0;
159         int num;
160         int (*cb)(int xok,X509_STORE_CTX *xctx);
161         STACK_OF(X509) *sktmp=NULL;
162         if (ctx->cert == NULL)
163                 {
164                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
165                 return -1;
166                 }
167
168         cb=ctx->verify_cb;
169
170         /* first we make sure the chain we are going to build is
171          * present and that the first entry is in place */
172         if (ctx->chain == NULL)
173                 {
174                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
175                         (!sk_X509_push(ctx->chain,ctx->cert)))
176                         {
177                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
178                         goto end;
179                         }
180                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
181                 ctx->last_untrusted=1;
182                 }
183
184         /* We use a temporary STACK so we can chop and hack at it */
185         if (ctx->untrusted != NULL
186             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
187                 {
188                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
189                 goto end;
190                 }
191
192         num=sk_X509_num(ctx->chain);
193         x=sk_X509_value(ctx->chain,num-1);
194         depth=param->depth;
195
196
197         for (;;)
198                 {
199                 /* If we have enough, we break */
200                 if (depth < num) break; /* FIXME: If this happens, we should take
201                                          * note of it and, if appropriate, use the
202                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
203                                          * code later.
204                                          */
205
206                 /* If we are self signed, we break */
207                 if (ctx->check_issued(ctx, x,x)) break;
208
209                 /* If we were passed a cert chain, use it first */
210                 if (ctx->untrusted != NULL)
211                         {
212                         xtmp=find_issuer(ctx, sktmp,x);
213                         if (xtmp != NULL)
214                                 {
215                                 if (!sk_X509_push(ctx->chain,xtmp))
216                                         {
217                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
218                                         goto end;
219                                         }
220                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
221                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
222                                 ctx->last_untrusted++;
223                                 x=xtmp;
224                                 num++;
225                                 /* reparse the full chain for
226                                  * the next one */
227                                 continue;
228                                 }
229                         }
230                 break;
231                 }
232
233         /* at this point, chain should contain a list of untrusted
234          * certificates.  We now need to add at least one trusted one,
235          * if possible, otherwise we complain. */
236
237         /* Examine last certificate in chain and see if it
238          * is self signed.
239          */
240
241         i=sk_X509_num(ctx->chain);
242         x=sk_X509_value(ctx->chain,i-1);
243         if (ctx->check_issued(ctx, x, x))
244                 {
245                 /* we have a self signed certificate */
246                 if (sk_X509_num(ctx->chain) == 1)
247                         {
248                         /* We have a single self signed certificate: see if
249                          * we can find it in the store. We must have an exact
250                          * match to avoid possible impersonation.
251                          */
252                         ok = ctx->get_issuer(&xtmp, ctx, x);
253                         if ((ok <= 0) || X509_cmp(x, xtmp)) 
254                                 {
255                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
256                                 ctx->current_cert=x;
257                                 ctx->error_depth=i-1;
258                                 if (ok == 1) X509_free(xtmp);
259                                 bad_chain = 1;
260                                 ok=cb(0,ctx);
261                                 if (!ok) goto end;
262                                 }
263                         else 
264                                 {
265                                 /* We have a match: replace certificate with store version
266                                  * so we get any trust settings.
267                                  */
268                                 X509_free(x);
269                                 x = xtmp;
270                                 (void)sk_X509_set(ctx->chain, i - 1, x);
271                                 ctx->last_untrusted=0;
272                                 }
273                         }
274                 else
275                         {
276                         /* extract and save self signed certificate for later use */
277                         chain_ss=sk_X509_pop(ctx->chain);
278                         ctx->last_untrusted--;
279                         num--;
280                         x=sk_X509_value(ctx->chain,num-1);
281                         }
282                 }
283
284         /* We now lookup certs from the certificate store */
285         for (;;)
286                 {
287                 /* If we have enough, we break */
288                 if (depth < num) break;
289
290                 /* If we are self signed, we break */
291                 if (ctx->check_issued(ctx,x,x)) break;
292
293                 ok = ctx->get_issuer(&xtmp, ctx, x);
294
295                 if (ok < 0) return ok;
296                 if (ok == 0) break;
297
298                 x = xtmp;
299                 if (!sk_X509_push(ctx->chain,x))
300                         {
301                         X509_free(xtmp);
302                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
303                         return 0;
304                         }
305                 num++;
306                 }
307
308         /* we now have our chain, lets check it... */
309
310         /* Is last certificate looked up self signed? */
311         if (!ctx->check_issued(ctx,x,x))
312                 {
313                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
314                         {
315                         if (ctx->last_untrusted >= num)
316                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
317                         else
318                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
319                         ctx->current_cert=x;
320                         }
321                 else
322                         {
323
324                         sk_X509_push(ctx->chain,chain_ss);
325                         num++;
326                         ctx->last_untrusted=num;
327                         ctx->current_cert=chain_ss;
328                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
329                         chain_ss=NULL;
330                         }
331
332                 ctx->error_depth=num-1;
333                 bad_chain = 1;
334                 ok=cb(0,ctx);
335                 if (!ok) goto end;
336                 }
337
338         /* We have the chain complete: now we need to check its purpose */
339         ok = check_chain_extensions(ctx);
340
341         if (!ok) goto end;
342
343         /* Check name constraints */
344
345         ok = check_name_constraints(ctx);
346         
347         if (!ok) goto end;
348
349         /* The chain extensions are OK: check trust */
350
351         if (param->trust > 0) ok = check_trust(ctx);
352
353         if (!ok) goto end;
354
355         /* We may as well copy down any DSA parameters that are required */
356         X509_get_pubkey_parameters(NULL,ctx->chain);
357
358         /* Check revocation status: we do this after copying parameters
359          * because they may be needed for CRL signature verification.
360          */
361
362         ok = ctx->check_revocation(ctx);
363         if(!ok) goto end;
364
365         /* At this point, we have a chain and need to verify it */
366         if (ctx->verify != NULL)
367                 ok=ctx->verify(ctx);
368         else
369                 ok=internal_verify(ctx);
370         if(!ok) goto end;
371
372 #ifndef OPENSSL_NO_RFC3779
373         /* RFC 3779 path validation, now that CRL check has been done */
374         ok = v3_asid_validate_path(ctx);
375         if (!ok) goto end;
376         ok = v3_addr_validate_path(ctx);
377         if (!ok) goto end;
378 #endif
379
380         /* If we get this far evaluate policies */
381         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
382                 ok = ctx->check_policy(ctx);
383         if(!ok) goto end;
384         if (0)
385                 {
386 end:
387                 X509_get_pubkey_parameters(NULL,ctx->chain);
388                 }
389         if (sktmp != NULL) sk_X509_free(sktmp);
390         if (chain_ss != NULL) X509_free(chain_ss);
391         return ok;
392         }
393
394
395 /* Given a STACK_OF(X509) find the issuer of cert (if any)
396  */
397
398 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
399 {
400         int i;
401         X509 *issuer;
402         for (i = 0; i < sk_X509_num(sk); i++)
403                 {
404                 issuer = sk_X509_value(sk, i);
405                 if (ctx->check_issued(ctx, x, issuer))
406                         return issuer;
407                 }
408         return NULL;
409 }
410
411 /* Given a possible certificate and issuer check them */
412
413 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
414 {
415         int ret;
416         ret = X509_check_issued(issuer, x);
417         if (ret == X509_V_OK)
418                 return 1;
419         /* If we haven't asked for issuer errors don't set ctx */
420         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
421                 return 0;
422
423         ctx->error = ret;
424         ctx->current_cert = x;
425         ctx->current_issuer = issuer;
426         return ctx->verify_cb(0, ctx);
427         return 0;
428 }
429
430 /* Alternative lookup method: look from a STACK stored in other_ctx */
431
432 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
433 {
434         *issuer = find_issuer(ctx, ctx->other_ctx, x);
435         if (*issuer)
436                 {
437                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
438                 return 1;
439                 }
440         else
441                 return 0;
442 }
443         
444
445 /* Check a certificate chains extensions for consistency
446  * with the supplied purpose
447  */
448
449 static int check_chain_extensions(X509_STORE_CTX *ctx)
450 {
451 #ifdef OPENSSL_NO_CHAIN_VERIFY
452         return 1;
453 #else
454         int i, ok=0, must_be_ca, plen = 0;
455         X509 *x;
456         int (*cb)(int xok,X509_STORE_CTX *xctx);
457         int proxy_path_length = 0;
458         int purpose;
459         int allow_proxy_certs;
460         cb=ctx->verify_cb;
461
462         /* must_be_ca can have 1 of 3 values:
463            -1: we accept both CA and non-CA certificates, to allow direct
464                use of self-signed certificates (which are marked as CA).
465            0:  we only accept non-CA certificates.  This is currently not
466                used, but the possibility is present for future extensions.
467            1:  we only accept CA certificates.  This is currently used for
468                all certificates in the chain except the leaf certificate.
469         */
470         must_be_ca = -1;
471
472         /* CRL path validation */
473         if (ctx->parent)
474                 {
475                 allow_proxy_certs = 0;
476                 purpose = X509_PURPOSE_CRL_SIGN;
477                 }
478         else
479                 {
480                 allow_proxy_certs =
481                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
482                 /* A hack to keep people who don't want to modify their
483                    software happy */
484                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
485                         allow_proxy_certs = 1;
486                 purpose = ctx->param->purpose;
487                 }
488
489         /* Check all untrusted certificates */
490         for (i = 0; i < ctx->last_untrusted; i++)
491                 {
492                 int ret;
493                 x = sk_X509_value(ctx->chain, i);
494                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
495                         && (x->ex_flags & EXFLAG_CRITICAL))
496                         {
497                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
498                         ctx->error_depth = i;
499                         ctx->current_cert = x;
500                         ok=cb(0,ctx);
501                         if (!ok) goto end;
502                         }
503                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
504                         {
505                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
506                         ctx->error_depth = i;
507                         ctx->current_cert = x;
508                         ok=cb(0,ctx);
509                         if (!ok) goto end;
510                         }
511                 ret = X509_check_ca(x);
512                 switch(must_be_ca)
513                         {
514                 case -1:
515                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
516                                 && (ret != 1) && (ret != 0))
517                                 {
518                                 ret = 0;
519                                 ctx->error = X509_V_ERR_INVALID_CA;
520                                 }
521                         else
522                                 ret = 1;
523                         break;
524                 case 0:
525                         if (ret != 0)
526                                 {
527                                 ret = 0;
528                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
529                                 }
530                         else
531                                 ret = 1;
532                         break;
533                 default:
534                         if ((ret == 0)
535                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
536                                         && (ret != 1)))
537                                 {
538                                 ret = 0;
539                                 ctx->error = X509_V_ERR_INVALID_CA;
540                                 }
541                         else
542                                 ret = 1;
543                         break;
544                         }
545                 if (ret == 0)
546                         {
547                         ctx->error_depth = i;
548                         ctx->current_cert = x;
549                         ok=cb(0,ctx);
550                         if (!ok) goto end;
551                         }
552                 if (ctx->param->purpose > 0)
553                         {
554                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
555                         if ((ret == 0)
556                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
557                                         && (ret != 1)))
558                                 {
559                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
560                                 ctx->error_depth = i;
561                                 ctx->current_cert = x;
562                                 ok=cb(0,ctx);
563                                 if (!ok) goto end;
564                                 }
565                         }
566                 /* Check pathlen if not self issued */
567                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
568                            && (x->ex_pathlen != -1)
569                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
570                         {
571                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
572                         ctx->error_depth = i;
573                         ctx->current_cert = x;
574                         ok=cb(0,ctx);
575                         if (!ok) goto end;
576                         }
577                 /* Increment path length if not self issued */
578                 if (!(x->ex_flags & EXFLAG_SI))
579                         plen++;
580                 /* If this certificate is a proxy certificate, the next
581                    certificate must be another proxy certificate or a EE
582                    certificate.  If not, the next certificate must be a
583                    CA certificate.  */
584                 if (x->ex_flags & EXFLAG_PROXY)
585                         {
586                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
587                                 {
588                                 ctx->error =
589                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
590                                 ctx->error_depth = i;
591                                 ctx->current_cert = x;
592                                 ok=cb(0,ctx);
593                                 if (!ok) goto end;
594                                 }
595                         proxy_path_length++;
596                         must_be_ca = 0;
597                         }
598                 else
599                         must_be_ca = 1;
600                 }
601         ok = 1;
602  end:
603         return ok;
604 #endif
605 }
606
607 static int check_name_constraints(X509_STORE_CTX *ctx)
608         {
609         X509 *x;
610         int i, j, rv;
611         /* Check name constraints for all certificates */
612         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
613                 {
614                 x = sk_X509_value(ctx->chain, i);
615                 /* Ignore self issued certs unless last in chain */
616                 if (i && (x->ex_flags & EXFLAG_SI))
617                         continue;
618                 /* Check against constraints for all certificates higher in
619                  * chain including trust anchor. Trust anchor not strictly
620                  * speaking needed but if it includes constraints it is to be
621                  * assumed it expects them to be obeyed.
622                  */
623                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
624                         {
625                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
626                         if (nc)
627                                 {
628                                 rv = NAME_CONSTRAINTS_check(x, nc);
629                                 if (rv != X509_V_OK)
630                                         {
631                                         ctx->error = rv;
632                                         ctx->error_depth = i;
633                                         ctx->current_cert = x;
634                                         if (!ctx->verify_cb(0,ctx))
635                                                 return 0;
636                                         }
637                                 }
638                         }
639                 }
640         return 1;
641         }
642
643 static int check_trust(X509_STORE_CTX *ctx)
644 {
645 #ifdef OPENSSL_NO_CHAIN_VERIFY
646         return 1;
647 #else
648         int i, ok;
649         X509 *x;
650         int (*cb)(int xok,X509_STORE_CTX *xctx);
651         cb=ctx->verify_cb;
652 /* For now just check the last certificate in the chain */
653         i = sk_X509_num(ctx->chain) - 1;
654         x = sk_X509_value(ctx->chain, i);
655         ok = X509_check_trust(x, ctx->param->trust, 0);
656         if (ok == X509_TRUST_TRUSTED)
657                 return 1;
658         ctx->error_depth = i;
659         ctx->current_cert = x;
660         if (ok == X509_TRUST_REJECTED)
661                 ctx->error = X509_V_ERR_CERT_REJECTED;
662         else
663                 ctx->error = X509_V_ERR_CERT_UNTRUSTED;
664         ok = cb(0, ctx);
665         return ok;
666 #endif
667 }
668
669 static int check_revocation(X509_STORE_CTX *ctx)
670         {
671         int i, last, ok;
672         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
673                 return 1;
674         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
675                 last = sk_X509_num(ctx->chain) - 1;
676         else
677                 {
678                 /* If checking CRL paths this isn't the EE certificate */
679                 if (ctx->parent)
680                         return 1;
681                 last = 0;
682                 }
683         for(i = 0; i <= last; i++)
684                 {
685                 ctx->error_depth = i;
686                 ok = check_cert(ctx);
687                 if (!ok) return ok;
688                 }
689         return 1;
690         }
691
692 static int check_cert(X509_STORE_CTX *ctx)
693         {
694         X509_CRL *crl = NULL, *dcrl = NULL;
695         X509 *x;
696         int ok, cnum;
697         cnum = ctx->error_depth;
698         x = sk_X509_value(ctx->chain, cnum);
699         ctx->current_cert = x;
700         ctx->current_issuer = NULL;
701         ctx->current_crl_score = 0;
702         ctx->current_reasons = 0;
703         while (ctx->current_reasons != CRLDP_ALL_REASONS)
704                 {
705                 /* Try to retrieve relevant CRL */
706                 if (ctx->get_crl)
707                         ok = ctx->get_crl(ctx, &crl, x);
708                 else
709                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
710                 /* If error looking up CRL, nothing we can do except
711                  * notify callback
712                  */
713                 if(!ok)
714                         {
715                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
716                         ok = ctx->verify_cb(0, ctx);
717                         goto err;
718                         }
719                 ctx->current_crl = crl;
720                 ok = ctx->check_crl(ctx, crl);
721                 if (!ok)
722                         goto err;
723
724                 if (dcrl)
725                         {
726                         ok = ctx->check_crl(ctx, dcrl);
727                         if (!ok)
728                                 goto err;
729                         ok = ctx->cert_crl(ctx, dcrl, x);
730                         if (!ok)
731                                 goto err;
732                         }
733                 else
734                         ok = 1;
735
736                 /* Don't look in full CRL if delta reason is removefromCRL */
737                 if (ok != 2)
738                         {
739                         ok = ctx->cert_crl(ctx, crl, x);
740                         if (!ok)
741                                 goto err;
742                         }
743
744                 X509_CRL_free(crl);
745                 X509_CRL_free(dcrl);
746                 crl = NULL;
747                 dcrl = NULL;
748                 }
749         err:
750         X509_CRL_free(crl);
751         X509_CRL_free(dcrl);
752
753         ctx->current_crl = NULL;
754         return ok;
755
756         }
757
758 /* Check CRL times against values in X509_STORE_CTX */
759
760 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
761         {
762         time_t *ptime;
763         int i;
764         if (notify)
765                 ctx->current_crl = crl;
766         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
767                 ptime = &ctx->param->check_time;
768         else
769                 ptime = NULL;
770
771         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
772         if (i == 0)
773                 {
774                 if (!notify)
775                         return 0;
776                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
777                 if (!ctx->verify_cb(0, ctx))
778                         return 0;
779                 }
780
781         if (i > 0)
782                 {
783                 if (!notify)
784                         return 0;
785                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
786                 if (!ctx->verify_cb(0, ctx))
787                         return 0;
788                 }
789
790         if(X509_CRL_get_nextUpdate(crl))
791                 {
792                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
793
794                 if (i == 0)
795                         {
796                         if (!notify)
797                                 return 0;
798                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
799                         if (!ctx->verify_cb(0, ctx))
800                                 return 0;
801                         }
802                 /* Ignore expiry of base CRL is delta is valid */
803                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
804                         {
805                         if (!notify)
806                                 return 0;
807                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
808                         if (!ctx->verify_cb(0, ctx))
809                                 return 0;
810                         }
811                 }
812
813         if (notify)
814                 ctx->current_crl = NULL;
815
816         return 1;
817         }
818
819 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
820                         X509 **pissuer, int *pscore, unsigned int *preasons,
821                         STACK_OF(X509_CRL) *crls)
822         {
823         int i, crl_score, best_score = *pscore;
824         unsigned int reasons, best_reasons = 0;
825         X509 *x = ctx->current_cert;
826         X509_CRL *crl, *best_crl = NULL;
827         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
828
829         for (i = 0; i < sk_X509_CRL_num(crls); i++)
830                 {
831                 crl = sk_X509_CRL_value(crls, i);
832                 reasons = *preasons;
833                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
834
835                 if (crl_score > best_score)
836                         {
837                         best_crl = crl;
838                         best_crl_issuer = crl_issuer;
839                         best_score = crl_score;
840                         best_reasons = reasons;
841                         }
842                 }
843
844         if (best_crl)
845                 {
846                 if (*pcrl)
847                         X509_CRL_free(*pcrl);
848                 *pcrl = best_crl;
849                 *pissuer = best_crl_issuer;
850                 *pscore = best_score;
851                 *preasons = best_reasons;
852                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
853                 if (*pdcrl)
854                         {
855                         X509_CRL_free(*pdcrl);
856                         *pdcrl = NULL;
857                         }
858                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
859                 }
860
861         if (best_score >= CRL_SCORE_VALID)
862                 return 1;
863
864         return 0;
865         }
866
867 /* Compare two CRL extensions for delta checking purposes. They should be
868  * both present or both absent. If both present all fields must be identical.
869  */
870
871 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
872         {
873         ASN1_OCTET_STRING *exta, *extb;
874         int i;
875         i = X509_CRL_get_ext_by_NID(a, nid, 0);
876         if (i >= 0)
877                 {
878                 /* Can't have multiple occurrences */
879                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
880                         return 0;
881                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
882                 }
883         else
884                 exta = NULL;
885
886         i = X509_CRL_get_ext_by_NID(b, nid, 0);
887
888         if (i >= 0)
889                 {
890
891                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
892                         return 0;
893                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
894                 }
895         else
896                 extb = NULL;
897
898         if (!exta && !extb)
899                 return 1;
900
901         if (!exta || !extb)
902                 return 0;
903
904
905         if (ASN1_OCTET_STRING_cmp(exta, extb))
906                 return 0;
907
908         return 1;
909         }
910
911 /* See if a base and delta are compatible */
912
913 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
914         {
915         /* Delta CRL must be a delta */
916         if (!delta->base_crl_number)
917                         return 0;
918         /* Base must have a CRL number */
919         if (!base->crl_number)
920                         return 0;
921         /* Issuer names must match */
922         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
923                                 X509_CRL_get_issuer(delta)))
924                 return 0;
925         /* AKID and IDP must match */
926         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
927                         return 0;
928         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
929                         return 0;
930         /* Delta CRL base number must not exceed Full CRL number. */
931         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
932                         return 0;
933         /* Delta CRL number must exceed full CRL number */
934         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
935                         return 1;
936         return 0;
937         }
938
939 /* For a given base CRL find a delta... maybe extend to delta scoring
940  * or retrieve a chain of deltas...
941  */
942
943 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
944                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
945         {
946         X509_CRL *delta;
947         int i;
948         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
949                 return;
950         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
951                 return;
952         for (i = 0; i < sk_X509_CRL_num(crls); i++)
953                 {
954                 delta = sk_X509_CRL_value(crls, i);
955                 if (check_delta_base(delta, base))
956                         {
957                         if (check_crl_time(ctx, delta, 0))
958                                 *pscore |= CRL_SCORE_TIME_DELTA;
959                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
960                         *dcrl = delta;
961                         return;
962                         }
963                 }
964         *dcrl = NULL;
965         }
966
967 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
968  * The return value is a mask of several criteria.
969  * If the issuer is not the certificate issuer this is returned in *pissuer.
970  * The reasons mask is also used to determine if the CRL is suitable: if
971  * no new reasons the CRL is rejected, otherwise reasons is updated.
972  */
973
974 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
975                         unsigned int *preasons,
976                         X509_CRL *crl, X509 *x)
977         {
978
979         int crl_score = 0;
980         unsigned int tmp_reasons = *preasons, crl_reasons;
981
982         /* First see if we can reject CRL straight away */
983
984         /* Invalid IDP cannot be processed */
985         if (crl->idp_flags & IDP_INVALID)
986                 return 0;
987         /* Reason codes or indirect CRLs need extended CRL support */
988         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
989                 {
990                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
991                         return 0;
992                 }
993         else if (crl->idp_flags & IDP_REASONS)
994                 {
995                 /* If no new reasons reject */
996                 if (!(crl->idp_reasons & ~tmp_reasons))
997                         return 0;
998                 }
999         /* Don't process deltas at this stage */
1000         else if (crl->base_crl_number)
1001                 return 0;
1002         /* If issuer name doesn't match certificate need indirect CRL */
1003         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1004                 {
1005                 if (!(crl->idp_flags & IDP_INDIRECT))
1006                         return 0;
1007                 }
1008         else
1009                 crl_score |= CRL_SCORE_ISSUER_NAME;
1010
1011         if (!(crl->flags & EXFLAG_CRITICAL))
1012                 crl_score |= CRL_SCORE_NOCRITICAL;
1013
1014         /* Check expiry */
1015         if (check_crl_time(ctx, crl, 0))
1016                 crl_score |= CRL_SCORE_TIME;
1017
1018         /* Check authority key ID and locate certificate issuer */
1019         crl_akid_check(ctx, crl, pissuer, &crl_score);
1020
1021         /* If we can't locate certificate issuer at this point forget it */
1022
1023         if (!(crl_score & CRL_SCORE_AKID))
1024                 return 0;
1025
1026         /* Check cert for matching CRL distribution points */
1027
1028         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1029                 {
1030                 /* If no new reasons reject */
1031                 if (!(crl_reasons & ~tmp_reasons))
1032                         return 0;
1033                 tmp_reasons |= crl_reasons;
1034                 crl_score |= CRL_SCORE_SCOPE;
1035                 }
1036
1037         *preasons = tmp_reasons;
1038
1039         return crl_score;
1040
1041         }
1042
1043 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1044                                 X509 **pissuer, int *pcrl_score)
1045         {
1046         X509 *crl_issuer = NULL;
1047         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1048         int cidx = ctx->error_depth;
1049         int i;
1050
1051         if (cidx != sk_X509_num(ctx->chain) - 1)
1052                 cidx++;
1053
1054         crl_issuer = sk_X509_value(ctx->chain, cidx);
1055
1056         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1057                 {
1058                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1059                         {
1060                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1061                         *pissuer = crl_issuer;
1062                         return;
1063                         }
1064                 }
1065
1066         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1067                 {
1068                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1069                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1070                         continue;
1071                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1072                         {
1073                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1074                         *pissuer = crl_issuer;
1075                         return;
1076                         }
1077                 }
1078
1079         /* Anything else needs extended CRL support */
1080
1081         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1082                 return;
1083
1084         /* Otherwise the CRL issuer is not on the path. Look for it in the
1085          * set of untrusted certificates.
1086          */
1087         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1088                 {
1089                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1090                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1091                         continue;
1092                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1093                         {
1094                         *pissuer = crl_issuer;
1095                         *pcrl_score |= CRL_SCORE_AKID;
1096                         return;
1097                         }
1098                 }
1099         }
1100
1101 /* Check the path of a CRL issuer certificate. This creates a new
1102  * X509_STORE_CTX and populates it with most of the parameters from the
1103  * parent. This could be optimised somewhat since a lot of path checking
1104  * will be duplicated by the parent, but this will rarely be used in 
1105  * practice.
1106  */
1107
1108 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1109         {
1110         X509_STORE_CTX crl_ctx;
1111         int ret;
1112         /* Don't allow recursive CRL path validation */
1113         if (ctx->parent)
1114                 return 0;
1115         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1116                 return -1;
1117
1118         crl_ctx.crls = ctx->crls;
1119         /* Copy verify params across */
1120         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1121
1122         crl_ctx.parent = ctx;
1123         crl_ctx.verify_cb = ctx->verify_cb;
1124
1125         /* Verify CRL issuer */
1126         ret = X509_verify_cert(&crl_ctx);
1127
1128         if (ret <= 0)
1129                 goto err;
1130
1131         /* Check chain is acceptable */
1132
1133         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1134         err:
1135         X509_STORE_CTX_cleanup(&crl_ctx);
1136         return ret;
1137         }
1138
1139 /* RFC3280 says nothing about the relationship between CRL path
1140  * and certificate path, which could lead to situations where a
1141  * certificate could be revoked or validated by a CA not authorised
1142  * to do so. RFC5280 is more strict and states that the two paths must
1143  * end in the same trust anchor, though some discussions remain...
1144  * until this is resolved we use the RFC5280 version
1145  */
1146
1147 static int check_crl_chain(X509_STORE_CTX *ctx,
1148                         STACK_OF(X509) *cert_path,
1149                         STACK_OF(X509) *crl_path)
1150         {
1151         X509 *cert_ta, *crl_ta;
1152         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1153         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1154         if (!X509_cmp(cert_ta, crl_ta))
1155                 return 1;
1156         return 0;
1157         }
1158
1159 /* Check for match between two dist point names: three separate cases.
1160  * 1. Both are relative names and compare X509_NAME types.
1161  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1162  * 3. Both are full names and compare two GENERAL_NAMES.
1163  * 4. One is NULL: automatic match.
1164  */
1165
1166
1167 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1168         {
1169         X509_NAME *nm = NULL;
1170         GENERAL_NAMES *gens = NULL;
1171         GENERAL_NAME *gena, *genb;
1172         int i, j;
1173         if (!a || !b)
1174                 return 1;
1175         if (a->type == 1)
1176                 {
1177                 if (!a->dpname)
1178                         return 0;
1179                 /* Case 1: two X509_NAME */
1180                 if (b->type == 1)
1181                         {
1182                         if (!b->dpname)
1183                                 return 0;
1184                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1185                                 return 1;
1186                         else
1187                                 return 0;
1188                         }
1189                 /* Case 2: set name and GENERAL_NAMES appropriately */
1190                 nm = a->dpname;
1191                 gens = b->name.fullname;
1192                 }
1193         else if (b->type == 1)
1194                 {
1195                 if (!b->dpname)
1196                         return 0;
1197                 /* Case 2: set name and GENERAL_NAMES appropriately */
1198                 gens = a->name.fullname;
1199                 nm = b->dpname;
1200                 }
1201
1202         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1203         if (nm)
1204                 {
1205                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1206                         {
1207                         gena = sk_GENERAL_NAME_value(gens, i);  
1208                         if (gena->type != GEN_DIRNAME)
1209                                 continue;
1210                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1211                                 return 1;
1212                         }
1213                 return 0;
1214                 }
1215
1216         /* Else case 3: two GENERAL_NAMES */
1217
1218         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1219                 {
1220                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1221                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1222                         {
1223                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1224                         if (!GENERAL_NAME_cmp(gena, genb))
1225                                 return 1;
1226                         }
1227                 }
1228
1229         return 0;
1230
1231         }
1232
1233 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1234         {
1235         int i;
1236         X509_NAME *nm = X509_CRL_get_issuer(crl);
1237         /* If no CRLissuer return is successful iff don't need a match */
1238         if (!dp->CRLissuer)
1239                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1240         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1241                 {
1242                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1243                 if (gen->type != GEN_DIRNAME)
1244                         continue;
1245                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1246                         return 1;
1247                 }
1248         return 0;
1249         }
1250
1251 /* Check CRLDP and IDP */
1252
1253 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1254                                 unsigned int *preasons)
1255         {
1256         int i;
1257         if (crl->idp_flags & IDP_ONLYATTR)
1258                 return 0;
1259         if (x->ex_flags & EXFLAG_CA)
1260                 {
1261                 if (crl->idp_flags & IDP_ONLYUSER)
1262                         return 0;
1263                 }
1264         else
1265                 {
1266                 if (crl->idp_flags & IDP_ONLYCA)
1267                         return 0;
1268                 }
1269         *preasons = crl->idp_reasons;
1270         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1271                 {
1272                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1273                 if (crldp_check_crlissuer(dp, crl, crl_score))
1274                         {
1275                         if (!crl->idp ||
1276                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1277                                 {
1278                                 *preasons &= dp->dp_reasons;
1279                                 return 1;
1280                                 }
1281                         }
1282                 }
1283         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1284                 return 1;
1285         return 0;
1286         }
1287
1288 /* Retrieve CRL corresponding to current certificate.
1289  * If deltas enabled try to find a delta CRL too
1290  */
1291         
1292 static int get_crl_delta(X509_STORE_CTX *ctx,
1293                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1294         {
1295         int ok;
1296         X509 *issuer = NULL;
1297         int crl_score = 0;
1298         unsigned int reasons;
1299         X509_CRL *crl = NULL, *dcrl = NULL;
1300         STACK_OF(X509_CRL) *skcrl;
1301         X509_NAME *nm = X509_get_issuer_name(x);
1302         reasons = ctx->current_reasons;
1303         ok = get_crl_sk(ctx, &crl, &dcrl, 
1304                                 &issuer, &crl_score, &reasons, ctx->crls);
1305
1306         if (ok)
1307                 goto done;
1308
1309         /* Lookup CRLs from store */
1310
1311         skcrl = ctx->lookup_crls(ctx, nm);
1312
1313         /* If no CRLs found and a near match from get_crl_sk use that */
1314         if (!skcrl && crl)
1315                 goto done;
1316
1317         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1318
1319         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1320
1321         done:
1322
1323         /* If we got any kind of CRL use it and return success */
1324         if (crl)
1325                 {
1326                 ctx->current_issuer = issuer;
1327                 ctx->current_crl_score = crl_score;
1328                 ctx->current_reasons = reasons;
1329                 *pcrl = crl;
1330                 *pdcrl = dcrl;
1331                 return 1;
1332                 }
1333
1334         return 0;
1335         }
1336
1337 /* Check CRL validity */
1338 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1339         {
1340         X509 *issuer = NULL;
1341         EVP_PKEY *ikey = NULL;
1342         int ok = 0, chnum, cnum;
1343         cnum = ctx->error_depth;
1344         chnum = sk_X509_num(ctx->chain) - 1;
1345         /* if we have an alternative CRL issuer cert use that */
1346         if (ctx->current_issuer)
1347                 issuer = ctx->current_issuer;
1348
1349         /* Else find CRL issuer: if not last certificate then issuer
1350          * is next certificate in chain.
1351          */
1352         else if (cnum < chnum)
1353                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1354         else
1355                 {
1356                 issuer = sk_X509_value(ctx->chain, chnum);
1357                 /* If not self signed, can't check signature */
1358                 if(!ctx->check_issued(ctx, issuer, issuer))
1359                         {
1360                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1361                         ok = ctx->verify_cb(0, ctx);
1362                         if(!ok) goto err;
1363                         }
1364                 }
1365
1366         if(issuer)
1367                 {
1368                 /* Skip most tests for deltas because they have already
1369                  * been done
1370                  */
1371                 if (!crl->base_crl_number)
1372                         {
1373                         /* Check for cRLSign bit if keyUsage present */
1374                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1375                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1376                                 {
1377                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1378                                 ok = ctx->verify_cb(0, ctx);
1379                                 if(!ok) goto err;
1380                                 }
1381
1382                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1383                                 {
1384                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1385                                 ok = ctx->verify_cb(0, ctx);
1386                                 if(!ok) goto err;
1387                                 }
1388
1389                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1390                                 {
1391                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1392                                         {
1393                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1394                                         ok = ctx->verify_cb(0, ctx);
1395                                         if(!ok) goto err;
1396                                         }
1397                                 }
1398
1399                         if (crl->idp_flags & IDP_INVALID)
1400                                 {
1401                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1402                                 ok = ctx->verify_cb(0, ctx);
1403                                 if(!ok) goto err;
1404                                 }
1405
1406
1407                         }
1408
1409                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1410                         {
1411                         ok = check_crl_time(ctx, crl, 1);
1412                         if (!ok)
1413                                 goto err;
1414                         }
1415
1416                 /* Attempt to get issuer certificate public key */
1417                 ikey = X509_get_pubkey(issuer);
1418
1419                 if(!ikey)
1420                         {
1421                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1422                         ok = ctx->verify_cb(0, ctx);
1423                         if (!ok) goto err;
1424                         }
1425                 else
1426                         {
1427                         /* Verify CRL signature */
1428                         if(X509_CRL_verify(crl, ikey) <= 0)
1429                                 {
1430                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1431                                 ok = ctx->verify_cb(0, ctx);
1432                                 if (!ok) goto err;
1433                                 }
1434                         }
1435                 }
1436
1437         ok = 1;
1438
1439         err:
1440         EVP_PKEY_free(ikey);
1441         return ok;
1442         }
1443
1444 /* Check certificate against CRL */
1445 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1446         {
1447         int ok;
1448         X509_REVOKED *rev;
1449         /* The rules changed for this... previously if a CRL contained
1450          * unhandled critical extensions it could still be used to indicate
1451          * a certificate was revoked. This has since been changed since 
1452          * critical extension can change the meaning of CRL entries.
1453          */
1454         if (crl->flags & EXFLAG_CRITICAL)
1455                 {
1456                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1457                         return 1;
1458                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1459                 ok = ctx->verify_cb(0, ctx);
1460                 if(!ok)
1461                         return 0;
1462                 }
1463         /* Look for serial number of certificate in CRL
1464          * If found make sure reason is not removeFromCRL.
1465          */
1466         if (X509_CRL_get0_by_cert(crl, &rev, x))
1467                 {
1468                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1469                         return 2;
1470                 ctx->error = X509_V_ERR_CERT_REVOKED;
1471                 ok = ctx->verify_cb(0, ctx);
1472                 if (!ok)
1473                         return 0;
1474                 }
1475
1476         return 1;
1477         }
1478
1479 static int check_policy(X509_STORE_CTX *ctx)
1480         {
1481         int ret;
1482         if (ctx->parent)
1483                 return 1;
1484         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1485                                 ctx->param->policies, ctx->param->flags);
1486         if (ret == 0)
1487                 {
1488                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1489                 return 0;
1490                 }
1491         /* Invalid or inconsistent extensions */
1492         if (ret == -1)
1493                 {
1494                 /* Locate certificates with bad extensions and notify
1495                  * callback.
1496                  */
1497                 X509 *x;
1498                 int i;
1499                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1500                         {
1501                         x = sk_X509_value(ctx->chain, i);
1502                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1503                                 continue;
1504                         ctx->current_cert = x;
1505                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1506                         if(!ctx->verify_cb(0, ctx))
1507                                 return 0;
1508                         }
1509                 return 1;
1510                 }
1511         if (ret == -2)
1512                 {
1513                 ctx->current_cert = NULL;
1514                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1515                 return ctx->verify_cb(0, ctx);
1516                 }
1517
1518         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1519                 {
1520                 ctx->current_cert = NULL;
1521                 ctx->error = X509_V_OK;
1522                 if (!ctx->verify_cb(2, ctx))
1523                         return 0;
1524                 }
1525
1526         return 1;
1527         }
1528
1529 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1530         {
1531         time_t *ptime;
1532         int i;
1533
1534         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1535                 ptime = &ctx->param->check_time;
1536         else
1537                 ptime = NULL;
1538
1539         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1540         if (i == 0)
1541                 {
1542                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1543                 ctx->current_cert=x;
1544                 if (!ctx->verify_cb(0, ctx))
1545                         return 0;
1546                 }
1547
1548         if (i > 0)
1549                 {
1550                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1551                 ctx->current_cert=x;
1552                 if (!ctx->verify_cb(0, ctx))
1553                         return 0;
1554                 }
1555
1556         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1557         if (i == 0)
1558                 {
1559                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1560                 ctx->current_cert=x;
1561                 if (!ctx->verify_cb(0, ctx))
1562                         return 0;
1563                 }
1564
1565         if (i < 0)
1566                 {
1567                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1568                 ctx->current_cert=x;
1569                 if (!ctx->verify_cb(0, ctx))
1570                         return 0;
1571                 }
1572
1573         return 1;
1574         }
1575
1576 static int internal_verify(X509_STORE_CTX *ctx)
1577         {
1578         int ok=0,n;
1579         X509 *xs,*xi;
1580         EVP_PKEY *pkey=NULL;
1581         int (*cb)(int xok,X509_STORE_CTX *xctx);
1582
1583         cb=ctx->verify_cb;
1584
1585         n=sk_X509_num(ctx->chain);
1586         ctx->error_depth=n-1;
1587         n--;
1588         xi=sk_X509_value(ctx->chain,n);
1589
1590         if (ctx->check_issued(ctx, xi, xi))
1591                 xs=xi;
1592         else
1593                 {
1594                 if (n <= 0)
1595                         {
1596                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1597                         ctx->current_cert=xi;
1598                         ok=cb(0,ctx);
1599                         goto end;
1600                         }
1601                 else
1602                         {
1603                         n--;
1604                         ctx->error_depth=n;
1605                         xs=sk_X509_value(ctx->chain,n);
1606                         }
1607                 }
1608
1609 /*      ctx->error=0;  not needed */
1610         while (n >= 0)
1611                 {
1612                 ctx->error_depth=n;
1613
1614                 /* Skip signature check for self signed certificates unless
1615                  * explicitly asked for. It doesn't add any security and
1616                  * just wastes time.
1617                  */
1618                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1619                         {
1620                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1621                                 {
1622                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1623                                 ctx->current_cert=xi;
1624                                 ok=(*cb)(0,ctx);
1625                                 if (!ok) goto end;
1626                                 }
1627                         else if (X509_verify(xs,pkey) <= 0)
1628                                 {
1629                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1630                                 ctx->current_cert=xs;
1631                                 ok=(*cb)(0,ctx);
1632                                 if (!ok)
1633                                         {
1634                                         EVP_PKEY_free(pkey);
1635                                         goto end;
1636                                         }
1637                                 }
1638                         EVP_PKEY_free(pkey);
1639                         pkey=NULL;
1640                         }
1641
1642                 xs->valid = 1;
1643
1644                 ok = check_cert_time(ctx, xs);
1645                 if (!ok)
1646                         goto end;
1647
1648                 /* The last error (if any) is still in the error value */
1649                 ctx->current_issuer=xi;
1650                 ctx->current_cert=xs;
1651                 ok=(*cb)(1,ctx);
1652                 if (!ok) goto end;
1653
1654                 n--;
1655                 if (n >= 0)
1656                         {
1657                         xi=xs;
1658                         xs=sk_X509_value(ctx->chain,n);
1659                         }
1660                 }
1661         ok=1;
1662 end:
1663         return ok;
1664         }
1665
1666 int X509_cmp_current_time(const ASN1_TIME *ctm)
1667 {
1668         return X509_cmp_time(ctm, NULL);
1669 }
1670
1671 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1672         {
1673         char *str;
1674         ASN1_TIME atm;
1675         long offset;
1676         char buff1[24],buff2[24],*p;
1677         int i,j;
1678
1679         p=buff1;
1680         i=ctm->length;
1681         str=(char *)ctm->data;
1682         if (ctm->type == V_ASN1_UTCTIME)
1683                 {
1684                 if ((i < 11) || (i > 17)) return 0;
1685                 memcpy(p,str,10);
1686                 p+=10;
1687                 str+=10;
1688                 }
1689         else
1690                 {
1691                 if (i < 13) return 0;
1692                 memcpy(p,str,12);
1693                 p+=12;
1694                 str+=12;
1695                 }
1696
1697         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1698                 { *(p++)='0'; *(p++)='0'; }
1699         else
1700                 { 
1701                 *(p++)= *(str++);
1702                 *(p++)= *(str++);
1703                 /* Skip any fractional seconds... */
1704                 if (*str == '.')
1705                         {
1706                         str++;
1707                         while ((*str >= '0') && (*str <= '9')) str++;
1708                         }
1709                 
1710                 }
1711         *(p++)='Z';
1712         *(p++)='\0';
1713
1714         if (*str == 'Z')
1715                 offset=0;
1716         else
1717                 {
1718                 if ((*str != '+') && (*str != '-'))
1719                         return 0;
1720                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1721                 offset+=(str[3]-'0')*10+(str[4]-'0');
1722                 if (*str == '-')
1723                         offset= -offset;
1724                 }
1725         atm.type=ctm->type;
1726         atm.flags = 0;
1727         atm.length=sizeof(buff2);
1728         atm.data=(unsigned char *)buff2;
1729
1730         if (X509_time_adj(&atm,-offset*60, cmp_time) == NULL)
1731                 return 0;
1732
1733         if (ctm->type == V_ASN1_UTCTIME)
1734                 {
1735                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1736                 if (i < 50) i+=100; /* cf. RFC 2459 */
1737                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1738                 if (j < 50) j+=100;
1739
1740                 if (i < j) return -1;
1741                 if (i > j) return 1;
1742                 }
1743         i=strcmp(buff1,buff2);
1744         if (i == 0) /* wait a second then return younger :-) */
1745                 return -1;
1746         else
1747                 return i;
1748         }
1749
1750 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1751 {
1752         return X509_time_adj(s, adj, NULL);
1753 }
1754
1755 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1756         {
1757         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1758         }
1759
1760 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1761                                 int offset_day, long offset_sec, time_t *in_tm)
1762         {
1763         time_t t;
1764
1765         if (in_tm) t = *in_tm;
1766         else time(&t);
1767
1768         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1769                 {
1770                 if (s->type == V_ASN1_UTCTIME)
1771                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1772                 if (s->type == V_ASN1_GENERALIZEDTIME)
1773                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1774                                                                 offset_sec);
1775                 }
1776         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1777         }
1778
1779 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1780         {
1781         EVP_PKEY *ktmp=NULL,*ktmp2;
1782         int i,j;
1783
1784         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1785
1786         for (i=0; i<sk_X509_num(chain); i++)
1787                 {
1788                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1789                 if (ktmp == NULL)
1790                         {
1791                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1792                         return 0;
1793                         }
1794                 if (!EVP_PKEY_missing_parameters(ktmp))
1795                         break;
1796                 else
1797                         {
1798                         EVP_PKEY_free(ktmp);
1799                         ktmp=NULL;
1800                         }
1801                 }
1802         if (ktmp == NULL)
1803                 {
1804                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1805                 return 0;
1806                 }
1807
1808         /* first, populate the other certs */
1809         for (j=i-1; j >= 0; j--)
1810                 {
1811                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1812                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1813                 EVP_PKEY_free(ktmp2);
1814                 }
1815         
1816         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1817         EVP_PKEY_free(ktmp);
1818         return 1;
1819         }
1820
1821 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
1822              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
1823         {
1824         /* This function is (usually) called only once, by
1825          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
1826         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
1827                         new_func, dup_func, free_func);
1828         }
1829
1830 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
1831         {
1832         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
1833         }
1834
1835 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
1836         {
1837         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
1838         }
1839
1840 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
1841         {
1842         return ctx->error;
1843         }
1844
1845 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
1846         {
1847         ctx->error=err;
1848         }
1849
1850 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
1851         {
1852         return ctx->error_depth;
1853         }
1854
1855 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
1856         {
1857         return ctx->current_cert;
1858         }
1859
1860 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
1861         {
1862         return ctx->chain;
1863         }
1864
1865 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
1866         {
1867         int i;
1868         X509 *x;
1869         STACK_OF(X509) *chain;
1870         if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
1871         for (i = 0; i < sk_X509_num(chain); i++)
1872                 {
1873                 x = sk_X509_value(chain, i);
1874                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1875                 }
1876         return chain;
1877         }
1878
1879 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
1880         {
1881         return ctx->current_issuer;
1882         }
1883
1884 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
1885         {
1886         return ctx->current_crl;
1887         }
1888
1889 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
1890         {
1891         return ctx->parent;
1892         }
1893
1894 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
1895         {
1896         ctx->cert=x;
1897         }
1898
1899 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
1900         {
1901         ctx->untrusted=sk;
1902         }
1903
1904 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
1905         {
1906         ctx->crls=sk;
1907         }
1908
1909 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
1910         {
1911         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
1912         }
1913
1914 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
1915         {
1916         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
1917         }
1918
1919 /* This function is used to set the X509_STORE_CTX purpose and trust
1920  * values. This is intended to be used when another structure has its
1921  * own trust and purpose values which (if set) will be inherited by
1922  * the ctx. If they aren't set then we will usually have a default
1923  * purpose in mind which should then be used to set the trust value.
1924  * An example of this is SSL use: an SSL structure will have its own
1925  * purpose and trust settings which the application can set: if they
1926  * aren't set then we use the default of SSL client/server.
1927  */
1928
1929 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
1930                                 int purpose, int trust)
1931 {
1932         int idx;
1933         /* If purpose not set use default */
1934         if (!purpose) purpose = def_purpose;
1935         /* If we have a purpose then check it is valid */
1936         if (purpose)
1937                 {
1938                 X509_PURPOSE *ptmp;
1939                 idx = X509_PURPOSE_get_by_id(purpose);
1940                 if (idx == -1)
1941                         {
1942                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1943                                                 X509_R_UNKNOWN_PURPOSE_ID);
1944                         return 0;
1945                         }
1946                 ptmp = X509_PURPOSE_get0(idx);
1947                 if (ptmp->trust == X509_TRUST_DEFAULT)
1948                         {
1949                         idx = X509_PURPOSE_get_by_id(def_purpose);
1950                         if (idx == -1)
1951                                 {
1952                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1953                                                 X509_R_UNKNOWN_PURPOSE_ID);
1954                                 return 0;
1955                                 }
1956                         ptmp = X509_PURPOSE_get0(idx);
1957                         }
1958                 /* If trust not set then get from purpose default */
1959                 if (!trust) trust = ptmp->trust;
1960                 }
1961         if (trust)
1962                 {
1963                 idx = X509_TRUST_get_by_id(trust);
1964                 if (idx == -1)
1965                         {
1966                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1967                                                 X509_R_UNKNOWN_TRUST_ID);
1968                         return 0;
1969                         }
1970                 }
1971
1972         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
1973         if (trust && !ctx->param->trust) ctx->param->trust = trust;
1974         return 1;
1975 }
1976
1977 X509_STORE_CTX *X509_STORE_CTX_new(void)
1978 {
1979         X509_STORE_CTX *ctx;
1980         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
1981         if (!ctx)
1982                 {
1983                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
1984                 return NULL;
1985                 }
1986         memset(ctx, 0, sizeof(X509_STORE_CTX));
1987         return ctx;
1988 }
1989
1990 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
1991 {
1992         X509_STORE_CTX_cleanup(ctx);
1993         OPENSSL_free(ctx);
1994 }
1995
1996 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
1997              STACK_OF(X509) *chain)
1998         {
1999         int ret = 1;
2000         ctx->ctx=store;
2001         ctx->current_method=0;
2002         ctx->cert=x509;
2003         ctx->untrusted=chain;
2004         ctx->crls = NULL;
2005         ctx->last_untrusted=0;
2006         ctx->other_ctx=NULL;
2007         ctx->valid=0;
2008         ctx->chain=NULL;
2009         ctx->error=0;
2010         ctx->explicit_policy=0;
2011         ctx->error_depth=0;
2012         ctx->current_cert=NULL;
2013         ctx->current_issuer=NULL;
2014         ctx->current_crl=NULL;
2015         ctx->current_crl_score=0;
2016         ctx->current_reasons=0;
2017         ctx->tree = NULL;
2018         ctx->parent = NULL;
2019
2020         ctx->param = X509_VERIFY_PARAM_new();
2021
2022         if (!ctx->param)
2023                 {
2024                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2025                 return 0;
2026                 }
2027
2028         /* Inherit callbacks and flags from X509_STORE if not set
2029          * use defaults.
2030          */
2031
2032
2033         if (store)
2034                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2035         else
2036                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2037
2038         if (store)
2039                 {
2040                 ctx->verify_cb = store->verify_cb;
2041                 ctx->cleanup = store->cleanup;
2042                 }
2043         else
2044                 ctx->cleanup = 0;
2045
2046         if (ret)
2047                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2048                                         X509_VERIFY_PARAM_lookup("default"));
2049
2050         if (ret == 0)
2051                 {
2052                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2053                 return 0;
2054                 }
2055
2056         if (store && store->check_issued)
2057                 ctx->check_issued = store->check_issued;
2058         else
2059                 ctx->check_issued = check_issued;
2060
2061         if (store && store->get_issuer)
2062                 ctx->get_issuer = store->get_issuer;
2063         else
2064                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2065
2066         if (store && store->verify_cb)
2067                 ctx->verify_cb = store->verify_cb;
2068         else
2069                 ctx->verify_cb = null_callback;
2070
2071         if (store && store->verify)
2072                 ctx->verify = store->verify;
2073         else
2074                 ctx->verify = internal_verify;
2075
2076         if (store && store->check_revocation)
2077                 ctx->check_revocation = store->check_revocation;
2078         else
2079                 ctx->check_revocation = check_revocation;
2080
2081         if (store && store->get_crl)
2082                 ctx->get_crl = store->get_crl;
2083         else
2084                 ctx->get_crl = NULL;
2085
2086         if (store && store->check_crl)
2087                 ctx->check_crl = store->check_crl;
2088         else
2089                 ctx->check_crl = check_crl;
2090
2091         if (store && store->cert_crl)
2092                 ctx->cert_crl = store->cert_crl;
2093         else
2094                 ctx->cert_crl = cert_crl;
2095
2096         if (store && store->lookup_certs)
2097                 ctx->lookup_certs = store->lookup_certs;
2098         else
2099                 ctx->lookup_certs = X509_STORE_get1_certs;
2100
2101         if (store && store->lookup_crls)
2102                 ctx->lookup_crls = store->lookup_crls;
2103         else
2104                 ctx->lookup_crls = X509_STORE_get1_crls;
2105
2106         ctx->check_policy = check_policy;
2107
2108
2109         /* This memset() can't make any sense anyway, so it's removed. As
2110          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2111          * corresponding "new" here and remove this bogus initialisation. */
2112         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2113         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2114                                 &(ctx->ex_data)))
2115                 {
2116                 OPENSSL_free(ctx);
2117                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2118                 return 0;
2119                 }
2120         return 1;
2121         }
2122
2123 /* Set alternative lookup method: just a STACK of trusted certificates.
2124  * This avoids X509_STORE nastiness where it isn't needed.
2125  */
2126
2127 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2128 {
2129         ctx->other_ctx = sk;
2130         ctx->get_issuer = get_issuer_sk;
2131 }
2132
2133 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2134         {
2135         if (ctx->cleanup) ctx->cleanup(ctx);
2136         if (ctx->param != NULL)
2137                 {
2138                 if (ctx->parent == NULL)
2139                         X509_VERIFY_PARAM_free(ctx->param);
2140                 ctx->param=NULL;
2141                 }
2142         if (ctx->tree != NULL)
2143                 {
2144                 X509_policy_tree_free(ctx->tree);
2145                 ctx->tree=NULL;
2146                 }
2147         if (ctx->chain != NULL)
2148                 {
2149                 sk_X509_pop_free(ctx->chain,X509_free);
2150                 ctx->chain=NULL;
2151                 }
2152         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2153         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2154         }
2155
2156 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2157         {
2158         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2159         }
2160
2161 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2162         {
2163         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2164         }
2165
2166 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2167         {
2168         X509_VERIFY_PARAM_set_time(ctx->param, t);
2169         }
2170
2171 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2172                                   int (*verify_cb)(int, X509_STORE_CTX *))
2173         {
2174         ctx->verify_cb=verify_cb;
2175         }
2176
2177 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2178         {
2179         return ctx->tree;
2180         }
2181
2182 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2183         {
2184         return ctx->explicit_policy;
2185         }
2186
2187 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2188         {
2189         const X509_VERIFY_PARAM *param;
2190         param = X509_VERIFY_PARAM_lookup(name);
2191         if (!param)
2192                 return 0;
2193         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2194         }
2195
2196 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2197         {
2198         return ctx->param;
2199         }
2200
2201 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2202         {
2203         if (ctx->param)
2204                 X509_VERIFY_PARAM_free(ctx->param);
2205         ctx->param = param;
2206         }
2207
2208 IMPLEMENT_STACK_OF(X509)
2209 IMPLEMENT_ASN1_SET_OF(X509)
2210
2211 IMPLEMENT_STACK_OF(X509_NAME)
2212
2213 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2214 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)