fadf712e4b9a4ea9b24c1044c7545ed06b38901c
[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 /* Return 1 is a certificate is self signed */
153 static int cert_self_signed(X509 *x)
154         {
155         X509_check_purpose(x, -1, 0);
156         if (x->ex_flags & EXFLAG_SS)
157                 return 1;
158         else
159                 return 0;
160         }
161
162 int X509_verify_cert(X509_STORE_CTX *ctx)
163         {
164         X509 *x,*xtmp,*chain_ss=NULL;
165         int bad_chain = 0;
166         X509_VERIFY_PARAM *param = ctx->param;
167         int depth,i,ok=0;
168         int num;
169         int (*cb)(int xok,X509_STORE_CTX *xctx);
170         STACK_OF(X509) *sktmp=NULL;
171         if (ctx->cert == NULL)
172                 {
173                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
174                 return -1;
175                 }
176
177         cb=ctx->verify_cb;
178
179         /* first we make sure the chain we are going to build is
180          * present and that the first entry is in place */
181         if (ctx->chain == NULL)
182                 {
183                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
184                         (!sk_X509_push(ctx->chain,ctx->cert)))
185                         {
186                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
187                         goto end;
188                         }
189                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
190                 ctx->last_untrusted=1;
191                 }
192
193         /* We use a temporary STACK so we can chop and hack at it */
194         if (ctx->untrusted != NULL
195             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
196                 {
197                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
198                 goto end;
199                 }
200
201         num=sk_X509_num(ctx->chain);
202         x=sk_X509_value(ctx->chain,num-1);
203         depth=param->depth;
204
205
206         for (;;)
207                 {
208                 /* If we have enough, we break */
209                 if (depth < num) break; /* FIXME: If this happens, we should take
210                                          * note of it and, if appropriate, use the
211                                          * X509_V_ERR_CERT_CHAIN_TOO_LONG error
212                                          * code later.
213                                          */
214
215                 /* If we are self signed, we break */
216                 if (cert_self_signed(x))
217                         break;
218                 /* If asked see if we can find issuer in trusted store first */
219                 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
220                         {
221                         ok = ctx->get_issuer(&xtmp, ctx, x);
222                         if (ok < 0)
223                                 return ok;
224                         /* If successful for now free up cert so it
225                          * will be picked up again later.
226                          */
227                         if (ok > 0)
228                                 {
229                                 X509_free(xtmp);
230                                 break;
231                                 }
232                         }
233
234                 /* If we were passed a cert chain, use it first */
235                 if (ctx->untrusted != NULL)
236                         {
237                         xtmp=find_issuer(ctx, sktmp,x);
238                         if (xtmp != NULL)
239                                 {
240                                 if (!sk_X509_push(ctx->chain,xtmp))
241                                         {
242                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
243                                         goto end;
244                                         }
245                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
246                                 (void)sk_X509_delete_ptr(sktmp,xtmp);
247                                 ctx->last_untrusted++;
248                                 x=xtmp;
249                                 num++;
250                                 /* reparse the full chain for
251                                  * the next one */
252                                 continue;
253                                 }
254                         }
255                 break;
256                 }
257
258         /* at this point, chain should contain a list of untrusted
259          * certificates.  We now need to add at least one trusted one,
260          * if possible, otherwise we complain. */
261
262         /* Examine last certificate in chain and see if it
263          * is self signed.
264          */
265
266         i=sk_X509_num(ctx->chain);
267         x=sk_X509_value(ctx->chain,i-1);
268         if (cert_self_signed(x))
269                 {
270                 /* we have a self signed certificate */
271                 if (sk_X509_num(ctx->chain) == 1)
272                         {
273                         /* We have a single self signed certificate: see if
274                          * we can find it in the store. We must have an exact
275                          * match to avoid possible impersonation.
276                          */
277                         ok = ctx->get_issuer(&xtmp, ctx, x);
278                         if ((ok <= 0) || X509_cmp(x, xtmp)) 
279                                 {
280                                 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
281                                 ctx->current_cert=x;
282                                 ctx->error_depth=i-1;
283                                 if (ok == 1) X509_free(xtmp);
284                                 bad_chain = 1;
285                                 ok=cb(0,ctx);
286                                 if (!ok) goto end;
287                                 }
288                         else 
289                                 {
290                                 /* We have a match: replace certificate with store version
291                                  * so we get any trust settings.
292                                  */
293                                 X509_free(x);
294                                 x = xtmp;
295                                 (void)sk_X509_set(ctx->chain, i - 1, x);
296                                 ctx->last_untrusted=0;
297                                 }
298                         }
299                 else
300                         {
301                         /* extract and save self signed certificate for later use */
302                         chain_ss=sk_X509_pop(ctx->chain);
303                         ctx->last_untrusted--;
304                         num--;
305                         x=sk_X509_value(ctx->chain,num-1);
306                         }
307                 }
308
309         /* We now lookup certs from the certificate store */
310         for (;;)
311                 {
312                 /* If we have enough, we break */
313                 if (depth < num) break;
314
315                 /* If we are self signed, we break */
316                 if (cert_self_signed(x))
317                         break;
318
319                 ok = ctx->get_issuer(&xtmp, ctx, x);
320
321                 if (ok < 0) return ok;
322                 if (ok == 0) break;
323
324                 x = xtmp;
325                 if (!sk_X509_push(ctx->chain,x))
326                         {
327                         X509_free(xtmp);
328                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
329                         return 0;
330                         }
331                 num++;
332                 }
333
334         /* we now have our chain, lets check it... */
335
336         i = check_trust(ctx);
337
338         /* If explicitly rejected error */
339         if (i == X509_TRUST_REJECTED)
340                 goto end;
341         /* If not explicitly trusted then indicate error */
342         if (i != X509_TRUST_TRUSTED)
343                 {
344                 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
345                         {
346                         if (ctx->last_untrusted >= num)
347                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
348                         else
349                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
350                         ctx->current_cert=x;
351                         }
352                 else
353                         {
354
355                         sk_X509_push(ctx->chain,chain_ss);
356                         num++;
357                         ctx->last_untrusted=num;
358                         ctx->current_cert=chain_ss;
359                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
360                         chain_ss=NULL;
361                         }
362
363                 ctx->error_depth=num-1;
364                 bad_chain = 1;
365                 ok=cb(0,ctx);
366                 if (!ok) goto end;
367                 }
368
369         /* We have the chain complete: now we need to check its purpose */
370         ok = check_chain_extensions(ctx);
371
372         if (!ok) goto end;
373
374         /* Check name constraints */
375
376         ok = check_name_constraints(ctx);
377         
378         if (!ok) goto end;
379
380         /* We may as well copy down any DSA parameters that are required */
381         X509_get_pubkey_parameters(NULL,ctx->chain);
382
383         /* Check revocation status: we do this after copying parameters
384          * because they may be needed for CRL signature verification.
385          */
386
387         ok = ctx->check_revocation(ctx);
388         if(!ok) goto end;
389
390         /* At this point, we have a chain and need to verify it */
391         if (ctx->verify != NULL)
392                 ok=ctx->verify(ctx);
393         else
394                 ok=internal_verify(ctx);
395         if(!ok) goto end;
396
397 #ifndef OPENSSL_NO_RFC3779
398         /* RFC 3779 path validation, now that CRL check has been done */
399         ok = v3_asid_validate_path(ctx);
400         if (!ok) goto end;
401         ok = v3_addr_validate_path(ctx);
402         if (!ok) goto end;
403 #endif
404
405         /* If we get this far evaluate policies */
406         if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
407                 ok = ctx->check_policy(ctx);
408         if(!ok) goto end;
409         if (0)
410                 {
411 end:
412                 X509_get_pubkey_parameters(NULL,ctx->chain);
413                 }
414         if (sktmp != NULL) sk_X509_free(sktmp);
415         if (chain_ss != NULL) X509_free(chain_ss);
416         return ok;
417         }
418
419
420 /* Given a STACK_OF(X509) find the issuer of cert (if any)
421  */
422
423 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
424 {
425         int i;
426         X509 *issuer;
427         for (i = 0; i < sk_X509_num(sk); i++)
428                 {
429                 issuer = sk_X509_value(sk, i);
430                 if (ctx->check_issued(ctx, x, issuer))
431                         return issuer;
432                 }
433         return NULL;
434 }
435
436 /* Given a possible certificate and issuer check them */
437
438 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
439 {
440         int ret;
441         ret = X509_check_issued(issuer, x);
442         if (ret == X509_V_OK)
443                 return 1;
444         /* If we haven't asked for issuer errors don't set ctx */
445         if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
446                 return 0;
447
448         ctx->error = ret;
449         ctx->current_cert = x;
450         ctx->current_issuer = issuer;
451         return ctx->verify_cb(0, ctx);
452         return 0;
453 }
454
455 /* Alternative lookup method: look from a STACK stored in other_ctx */
456
457 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
458 {
459         *issuer = find_issuer(ctx, ctx->other_ctx, x);
460         if (*issuer)
461                 {
462                 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
463                 return 1;
464                 }
465         else
466                 return 0;
467 }
468         
469
470 /* Check a certificate chains extensions for consistency
471  * with the supplied purpose
472  */
473
474 static int check_chain_extensions(X509_STORE_CTX *ctx)
475 {
476 #ifdef OPENSSL_NO_CHAIN_VERIFY
477         return 1;
478 #else
479         int i, ok=0, must_be_ca, plen = 0;
480         X509 *x;
481         int (*cb)(int xok,X509_STORE_CTX *xctx);
482         int proxy_path_length = 0;
483         int purpose;
484         int allow_proxy_certs;
485         cb=ctx->verify_cb;
486
487         /* must_be_ca can have 1 of 3 values:
488            -1: we accept both CA and non-CA certificates, to allow direct
489                use of self-signed certificates (which are marked as CA).
490            0:  we only accept non-CA certificates.  This is currently not
491                used, but the possibility is present for future extensions.
492            1:  we only accept CA certificates.  This is currently used for
493                all certificates in the chain except the leaf certificate.
494         */
495         must_be_ca = -1;
496
497         /* CRL path validation */
498         if (ctx->parent)
499                 {
500                 allow_proxy_certs = 0;
501                 purpose = X509_PURPOSE_CRL_SIGN;
502                 }
503         else
504                 {
505                 allow_proxy_certs =
506                         !!(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
507                 /* A hack to keep people who don't want to modify their
508                    software happy */
509                 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
510                         allow_proxy_certs = 1;
511                 purpose = ctx->param->purpose;
512                 }
513
514         /* Check all untrusted certificates */
515         for (i = 0; i < ctx->last_untrusted; i++)
516                 {
517                 int ret;
518                 x = sk_X509_value(ctx->chain, i);
519                 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
520                         && (x->ex_flags & EXFLAG_CRITICAL))
521                         {
522                         ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
523                         ctx->error_depth = i;
524                         ctx->current_cert = x;
525                         ok=cb(0,ctx);
526                         if (!ok) goto end;
527                         }
528                 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY))
529                         {
530                         ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
531                         ctx->error_depth = i;
532                         ctx->current_cert = x;
533                         ok=cb(0,ctx);
534                         if (!ok) goto end;
535                         }
536                 ret = X509_check_ca(x);
537                 switch(must_be_ca)
538                         {
539                 case -1:
540                         if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
541                                 && (ret != 1) && (ret != 0))
542                                 {
543                                 ret = 0;
544                                 ctx->error = X509_V_ERR_INVALID_CA;
545                                 }
546                         else
547                                 ret = 1;
548                         break;
549                 case 0:
550                         if (ret != 0)
551                                 {
552                                 ret = 0;
553                                 ctx->error = X509_V_ERR_INVALID_NON_CA;
554                                 }
555                         else
556                                 ret = 1;
557                         break;
558                 default:
559                         if ((ret == 0)
560                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
561                                         && (ret != 1)))
562                                 {
563                                 ret = 0;
564                                 ctx->error = X509_V_ERR_INVALID_CA;
565                                 }
566                         else
567                                 ret = 1;
568                         break;
569                         }
570                 if (ret == 0)
571                         {
572                         ctx->error_depth = i;
573                         ctx->current_cert = x;
574                         ok=cb(0,ctx);
575                         if (!ok) goto end;
576                         }
577                 if (ctx->param->purpose > 0)
578                         {
579                         ret = X509_check_purpose(x, purpose, must_be_ca > 0);
580                         if ((ret == 0)
581                                 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
582                                         && (ret != 1)))
583                                 {
584                                 ctx->error = X509_V_ERR_INVALID_PURPOSE;
585                                 ctx->error_depth = i;
586                                 ctx->current_cert = x;
587                                 ok=cb(0,ctx);
588                                 if (!ok) goto end;
589                                 }
590                         }
591                 /* Check pathlen if not self issued */
592                 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
593                            && (x->ex_pathlen != -1)
594                            && (plen > (x->ex_pathlen + proxy_path_length + 1)))
595                         {
596                         ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
597                         ctx->error_depth = i;
598                         ctx->current_cert = x;
599                         ok=cb(0,ctx);
600                         if (!ok) goto end;
601                         }
602                 /* Increment path length if not self issued */
603                 if (!(x->ex_flags & EXFLAG_SI))
604                         plen++;
605                 /* If this certificate is a proxy certificate, the next
606                    certificate must be another proxy certificate or a EE
607                    certificate.  If not, the next certificate must be a
608                    CA certificate.  */
609                 if (x->ex_flags & EXFLAG_PROXY)
610                         {
611                         if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen)
612                                 {
613                                 ctx->error =
614                                         X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
615                                 ctx->error_depth = i;
616                                 ctx->current_cert = x;
617                                 ok=cb(0,ctx);
618                                 if (!ok) goto end;
619                                 }
620                         proxy_path_length++;
621                         must_be_ca = 0;
622                         }
623                 else
624                         must_be_ca = 1;
625                 }
626         ok = 1;
627  end:
628         return ok;
629 #endif
630 }
631
632 static int check_name_constraints(X509_STORE_CTX *ctx)
633         {
634         X509 *x;
635         int i, j, rv;
636         /* Check name constraints for all certificates */
637         for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--)
638                 {
639                 x = sk_X509_value(ctx->chain, i);
640                 /* Ignore self issued certs unless last in chain */
641                 if (i && (x->ex_flags & EXFLAG_SI))
642                         continue;
643                 /* Check against constraints for all certificates higher in
644                  * chain including trust anchor. Trust anchor not strictly
645                  * speaking needed but if it includes constraints it is to be
646                  * assumed it expects them to be obeyed.
647                  */
648                 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--)
649                         {
650                         NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
651                         if (nc)
652                                 {
653                                 rv = NAME_CONSTRAINTS_check(x, nc);
654                                 if (rv != X509_V_OK)
655                                         {
656                                         ctx->error = rv;
657                                         ctx->error_depth = i;
658                                         ctx->current_cert = x;
659                                         if (!ctx->verify_cb(0,ctx))
660                                                 return 0;
661                                         }
662                                 }
663                         }
664                 }
665         return 1;
666         }
667
668 static int check_trust(X509_STORE_CTX *ctx)
669 {
670         int i, ok;
671         X509 *x = NULL;
672         int (*cb)(int xok,X509_STORE_CTX *xctx);
673         cb=ctx->verify_cb;
674         /* Check all trusted certificates in chain */
675         for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++)
676                 {
677                 x = sk_X509_value(ctx->chain, i);
678                 ok = X509_check_trust(x, ctx->param->trust, 0);
679                 /* If explicitly trusted return trusted */
680                 if (ok == X509_TRUST_TRUSTED)
681                         return X509_TRUST_TRUSTED;
682                 /* If explicitly rejected notify callback and reject if
683                  * not overridden.
684                  */
685                 if (ok == X509_TRUST_REJECTED)
686                         {
687                         ctx->error_depth = i;
688                         ctx->current_cert = x;
689                         ctx->error = X509_V_ERR_CERT_REJECTED;
690                         ok = cb(0, ctx);
691                         if (!ok)
692                                 return X509_TRUST_REJECTED;
693                         }
694                 }
695         /* If no trusted certs in chain at all return untrusted and
696          * allow standard (no issuer cert) etc errors to be indicated.
697          */
698         return X509_TRUST_UNTRUSTED;
699 }
700
701 static int check_revocation(X509_STORE_CTX *ctx)
702         {
703         int i, last, ok;
704         if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
705                 return 1;
706         if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
707                 last = sk_X509_num(ctx->chain) - 1;
708         else
709                 {
710                 /* If checking CRL paths this isn't the EE certificate */
711                 if (ctx->parent)
712                         return 1;
713                 last = 0;
714                 }
715         for(i = 0; i <= last; i++)
716                 {
717                 ctx->error_depth = i;
718                 ok = check_cert(ctx);
719                 if (!ok) return ok;
720                 }
721         return 1;
722         }
723
724 static int check_cert(X509_STORE_CTX *ctx)
725         {
726         X509_CRL *crl = NULL, *dcrl = NULL;
727         X509 *x;
728         int ok, cnum;
729         cnum = ctx->error_depth;
730         x = sk_X509_value(ctx->chain, cnum);
731         ctx->current_cert = x;
732         ctx->current_issuer = NULL;
733         ctx->current_reasons = 0;
734         while (ctx->current_reasons != CRLDP_ALL_REASONS)
735                 {
736                 /* Try to retrieve relevant CRL */
737                 if (ctx->get_crl)
738                         ok = ctx->get_crl(ctx, &crl, x);
739                 else
740                         ok = get_crl_delta(ctx, &crl, &dcrl, x);
741                 /* If error looking up CRL, nothing we can do except
742                  * notify callback
743                  */
744                 if(!ok)
745                         {
746                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
747                         ok = ctx->verify_cb(0, ctx);
748                         goto err;
749                         }
750                 ctx->current_crl = crl;
751                 ok = ctx->check_crl(ctx, crl);
752                 if (!ok)
753                         goto err;
754
755                 if (dcrl)
756                         {
757                         ok = ctx->check_crl(ctx, dcrl);
758                         if (!ok)
759                                 goto err;
760                         ok = ctx->cert_crl(ctx, dcrl, x);
761                         if (!ok)
762                                 goto err;
763                         }
764                 else
765                         ok = 1;
766
767                 /* Don't look in full CRL if delta reason is removefromCRL */
768                 if (ok != 2)
769                         {
770                         ok = ctx->cert_crl(ctx, crl, x);
771                         if (!ok)
772                                 goto err;
773                         }
774
775                 X509_CRL_free(crl);
776                 X509_CRL_free(dcrl);
777                 crl = NULL;
778                 dcrl = NULL;
779                 }
780         err:
781         X509_CRL_free(crl);
782         X509_CRL_free(dcrl);
783
784         ctx->current_crl = NULL;
785         return ok;
786
787         }
788
789 /* Check CRL times against values in X509_STORE_CTX */
790
791 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
792         {
793         time_t *ptime;
794         int i;
795         if (notify)
796                 ctx->current_crl = crl;
797         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
798                 ptime = &ctx->param->check_time;
799         else
800                 ptime = NULL;
801
802         i=X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
803         if (i == 0)
804                 {
805                 if (!notify)
806                         return 0;
807                 ctx->error=X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
808                 if (!ctx->verify_cb(0, ctx))
809                         return 0;
810                 }
811
812         if (i > 0)
813                 {
814                 if (!notify)
815                         return 0;
816                 ctx->error=X509_V_ERR_CRL_NOT_YET_VALID;
817                 if (!ctx->verify_cb(0, ctx))
818                         return 0;
819                 }
820
821         if(X509_CRL_get_nextUpdate(crl))
822                 {
823                 i=X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
824
825                 if (i == 0)
826                         {
827                         if (!notify)
828                                 return 0;
829                         ctx->error=X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
830                         if (!ctx->verify_cb(0, ctx))
831                                 return 0;
832                         }
833                 /* Ignore expiry of base CRL is delta is valid */
834                 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA))
835                         {
836                         if (!notify)
837                                 return 0;
838                         ctx->error=X509_V_ERR_CRL_HAS_EXPIRED;
839                         if (!ctx->verify_cb(0, ctx))
840                                 return 0;
841                         }
842                 }
843
844         if (notify)
845                 ctx->current_crl = NULL;
846
847         return 1;
848         }
849
850 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
851                         X509 **pissuer, int *pscore, unsigned int *preasons,
852                         STACK_OF(X509_CRL) *crls)
853         {
854         int i, crl_score, best_score = *pscore;
855         unsigned int reasons, best_reasons = 0;
856         X509 *x = ctx->current_cert;
857         X509_CRL *crl, *best_crl = NULL;
858         X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
859
860         for (i = 0; i < sk_X509_CRL_num(crls); i++)
861                 {
862                 crl = sk_X509_CRL_value(crls, i);
863                 reasons = *preasons;
864                 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
865
866                 if (crl_score > best_score)
867                         {
868                         best_crl = crl;
869                         best_crl_issuer = crl_issuer;
870                         best_score = crl_score;
871                         best_reasons = reasons;
872                         }
873                 }
874
875         if (best_crl)
876                 {
877                 if (*pcrl)
878                         X509_CRL_free(*pcrl);
879                 *pcrl = best_crl;
880                 *pissuer = best_crl_issuer;
881                 *pscore = best_score;
882                 *preasons = best_reasons;
883                 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
884                 if (*pdcrl)
885                         {
886                         X509_CRL_free(*pdcrl);
887                         *pdcrl = NULL;
888                         }
889                 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
890                 }
891
892         if (best_score >= CRL_SCORE_VALID)
893                 return 1;
894
895         return 0;
896         }
897
898 /* Compare two CRL extensions for delta checking purposes. They should be
899  * both present or both absent. If both present all fields must be identical.
900  */
901
902 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
903         {
904         ASN1_OCTET_STRING *exta, *extb;
905         int i;
906         i = X509_CRL_get_ext_by_NID(a, nid, 0);
907         if (i >= 0)
908                 {
909                 /* Can't have multiple occurrences */
910                 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
911                         return 0;
912                 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
913                 }
914         else
915                 exta = NULL;
916
917         i = X509_CRL_get_ext_by_NID(b, nid, 0);
918
919         if (i >= 0)
920                 {
921
922                 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
923                         return 0;
924                 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
925                 }
926         else
927                 extb = NULL;
928
929         if (!exta && !extb)
930                 return 1;
931
932         if (!exta || !extb)
933                 return 0;
934
935
936         if (ASN1_OCTET_STRING_cmp(exta, extb))
937                 return 0;
938
939         return 1;
940         }
941
942 /* See if a base and delta are compatible */
943
944 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
945         {
946         /* Delta CRL must be a delta */
947         if (!delta->base_crl_number)
948                         return 0;
949         /* Base must have a CRL number */
950         if (!base->crl_number)
951                         return 0;
952         /* Issuer names must match */
953         if (X509_NAME_cmp(X509_CRL_get_issuer(base),
954                                 X509_CRL_get_issuer(delta)))
955                 return 0;
956         /* AKID and IDP must match */
957         if (!crl_extension_match(delta, base, NID_authority_key_identifier))
958                         return 0;
959         if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
960                         return 0;
961         /* Delta CRL base number must not exceed Full CRL number. */
962         if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
963                         return 0;
964         /* Delta CRL number must exceed full CRL number */
965         if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
966                         return 1;
967         return 0;
968         }
969
970 /* For a given base CRL find a delta... maybe extend to delta scoring
971  * or retrieve a chain of deltas...
972  */
973
974 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
975                         X509_CRL *base, STACK_OF(X509_CRL) *crls)
976         {
977         X509_CRL *delta;
978         int i;
979         if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
980                 return;
981         if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
982                 return;
983         for (i = 0; i < sk_X509_CRL_num(crls); i++)
984                 {
985                 delta = sk_X509_CRL_value(crls, i);
986                 if (check_delta_base(delta, base))
987                         {
988                         if (check_crl_time(ctx, delta, 0))
989                                 *pscore |= CRL_SCORE_TIME_DELTA;
990                         CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
991                         *dcrl = delta;
992                         return;
993                         }
994                 }
995         *dcrl = NULL;
996         }
997
998 /* For a given CRL return how suitable it is for the supplied certificate 'x'.
999  * The return value is a mask of several criteria.
1000  * If the issuer is not the certificate issuer this is returned in *pissuer.
1001  * The reasons mask is also used to determine if the CRL is suitable: if
1002  * no new reasons the CRL is rejected, otherwise reasons is updated.
1003  */
1004
1005 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1006                         unsigned int *preasons,
1007                         X509_CRL *crl, X509 *x)
1008         {
1009
1010         int crl_score = 0;
1011         unsigned int tmp_reasons = *preasons, crl_reasons;
1012
1013         /* First see if we can reject CRL straight away */
1014
1015         /* Invalid IDP cannot be processed */
1016         if (crl->idp_flags & IDP_INVALID)
1017                 return 0;
1018         /* Reason codes or indirect CRLs need extended CRL support */
1019         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1020                 {
1021                 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1022                         return 0;
1023                 }
1024         else if (crl->idp_flags & IDP_REASONS)
1025                 {
1026                 /* If no new reasons reject */
1027                 if (!(crl->idp_reasons & ~tmp_reasons))
1028                         return 0;
1029                 }
1030         /* Don't process deltas at this stage */
1031         else if (crl->base_crl_number)
1032                 return 0;
1033         /* If issuer name doesn't match certificate need indirect CRL */
1034         if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl)))
1035                 {
1036                 if (!(crl->idp_flags & IDP_INDIRECT))
1037                         return 0;
1038                 }
1039         else
1040                 crl_score |= CRL_SCORE_ISSUER_NAME;
1041
1042         if (!(crl->flags & EXFLAG_CRITICAL))
1043                 crl_score |= CRL_SCORE_NOCRITICAL;
1044
1045         /* Check expiry */
1046         if (check_crl_time(ctx, crl, 0))
1047                 crl_score |= CRL_SCORE_TIME;
1048
1049         /* Check authority key ID and locate certificate issuer */
1050         crl_akid_check(ctx, crl, pissuer, &crl_score);
1051
1052         /* If we can't locate certificate issuer at this point forget it */
1053
1054         if (!(crl_score & CRL_SCORE_AKID))
1055                 return 0;
1056
1057         /* Check cert for matching CRL distribution points */
1058
1059         if (crl_crldp_check(x, crl, crl_score, &crl_reasons))
1060                 {
1061                 /* If no new reasons reject */
1062                 if (!(crl_reasons & ~tmp_reasons))
1063                         return 0;
1064                 tmp_reasons |= crl_reasons;
1065                 crl_score |= CRL_SCORE_SCOPE;
1066                 }
1067
1068         *preasons = tmp_reasons;
1069
1070         return crl_score;
1071
1072         }
1073
1074 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1075                                 X509 **pissuer, int *pcrl_score)
1076         {
1077         X509 *crl_issuer = NULL;
1078         X509_NAME *cnm = X509_CRL_get_issuer(crl);
1079         int cidx = ctx->error_depth;
1080         int i;
1081
1082         if (cidx != sk_X509_num(ctx->chain) - 1)
1083                 cidx++;
1084
1085         crl_issuer = sk_X509_value(ctx->chain, cidx);
1086
1087         if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1088                 {
1089                 if (*pcrl_score & CRL_SCORE_ISSUER_NAME)
1090                         {
1091                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_ISSUER_CERT;
1092                         *pissuer = crl_issuer;
1093                         return;
1094                         }
1095                 }
1096
1097         for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++)
1098                 {
1099                 crl_issuer = sk_X509_value(ctx->chain, cidx);
1100                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1101                         continue;
1102                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1103                         {
1104                         *pcrl_score |= CRL_SCORE_AKID|CRL_SCORE_SAME_PATH;
1105                         *pissuer = crl_issuer;
1106                         return;
1107                         }
1108                 }
1109
1110         /* Anything else needs extended CRL support */
1111
1112         if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1113                 return;
1114
1115         /* Otherwise the CRL issuer is not on the path. Look for it in the
1116          * set of untrusted certificates.
1117          */
1118         for (i = 0; i < sk_X509_num(ctx->untrusted); i++)
1119                 {
1120                 crl_issuer = sk_X509_value(ctx->untrusted, i);
1121                 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1122                         continue;
1123                 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK)
1124                         {
1125                         *pissuer = crl_issuer;
1126                         *pcrl_score |= CRL_SCORE_AKID;
1127                         return;
1128                         }
1129                 }
1130         }
1131
1132 /* Check the path of a CRL issuer certificate. This creates a new
1133  * X509_STORE_CTX and populates it with most of the parameters from the
1134  * parent. This could be optimised somewhat since a lot of path checking
1135  * will be duplicated by the parent, but this will rarely be used in 
1136  * practice.
1137  */
1138
1139 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1140         {
1141         X509_STORE_CTX crl_ctx;
1142         int ret;
1143         /* Don't allow recursive CRL path validation */
1144         if (ctx->parent)
1145                 return 0;
1146         if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1147                 return -1;
1148
1149         crl_ctx.crls = ctx->crls;
1150         /* Copy verify params across */
1151         X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1152
1153         crl_ctx.parent = ctx;
1154         crl_ctx.verify_cb = ctx->verify_cb;
1155
1156         /* Verify CRL issuer */
1157         ret = X509_verify_cert(&crl_ctx);
1158
1159         if (ret <= 0)
1160                 goto err;
1161
1162         /* Check chain is acceptable */
1163
1164         ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1165         err:
1166         X509_STORE_CTX_cleanup(&crl_ctx);
1167         return ret;
1168         }
1169
1170 /* RFC3280 says nothing about the relationship between CRL path
1171  * and certificate path, which could lead to situations where a
1172  * certificate could be revoked or validated by a CA not authorised
1173  * to do so. RFC5280 is more strict and states that the two paths must
1174  * end in the same trust anchor, though some discussions remain...
1175  * until this is resolved we use the RFC5280 version
1176  */
1177
1178 static int check_crl_chain(X509_STORE_CTX *ctx,
1179                         STACK_OF(X509) *cert_path,
1180                         STACK_OF(X509) *crl_path)
1181         {
1182         X509 *cert_ta, *crl_ta;
1183         cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1184         crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1185         if (!X509_cmp(cert_ta, crl_ta))
1186                 return 1;
1187         return 0;
1188         }
1189
1190 /* Check for match between two dist point names: three separate cases.
1191  * 1. Both are relative names and compare X509_NAME types.
1192  * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1193  * 3. Both are full names and compare two GENERAL_NAMES.
1194  * 4. One is NULL: automatic match.
1195  */
1196
1197
1198 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1199         {
1200         X509_NAME *nm = NULL;
1201         GENERAL_NAMES *gens = NULL;
1202         GENERAL_NAME *gena, *genb;
1203         int i, j;
1204         if (!a || !b)
1205                 return 1;
1206         if (a->type == 1)
1207                 {
1208                 if (!a->dpname)
1209                         return 0;
1210                 /* Case 1: two X509_NAME */
1211                 if (b->type == 1)
1212                         {
1213                         if (!b->dpname)
1214                                 return 0;
1215                         if (!X509_NAME_cmp(a->dpname, b->dpname))
1216                                 return 1;
1217                         else
1218                                 return 0;
1219                         }
1220                 /* Case 2: set name and GENERAL_NAMES appropriately */
1221                 nm = a->dpname;
1222                 gens = b->name.fullname;
1223                 }
1224         else if (b->type == 1)
1225                 {
1226                 if (!b->dpname)
1227                         return 0;
1228                 /* Case 2: set name and GENERAL_NAMES appropriately */
1229                 gens = a->name.fullname;
1230                 nm = b->dpname;
1231                 }
1232
1233         /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1234         if (nm)
1235                 {
1236                 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
1237                         {
1238                         gena = sk_GENERAL_NAME_value(gens, i);  
1239                         if (gena->type != GEN_DIRNAME)
1240                                 continue;
1241                         if (!X509_NAME_cmp(nm, gena->d.directoryName))
1242                                 return 1;
1243                         }
1244                 return 0;
1245                 }
1246
1247         /* Else case 3: two GENERAL_NAMES */
1248
1249         for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++)
1250                 {
1251                 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1252                 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++)
1253                         {
1254                         genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1255                         if (!GENERAL_NAME_cmp(gena, genb))
1256                                 return 1;
1257                         }
1258                 }
1259
1260         return 0;
1261
1262         }
1263
1264 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1265         {
1266         int i;
1267         X509_NAME *nm = X509_CRL_get_issuer(crl);
1268         /* If no CRLissuer return is successful iff don't need a match */
1269         if (!dp->CRLissuer)
1270                 return !!(crl_score & CRL_SCORE_ISSUER_NAME);
1271         for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++)
1272                 {
1273                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1274                 if (gen->type != GEN_DIRNAME)
1275                         continue;
1276                 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1277                         return 1;
1278                 }
1279         return 0;
1280         }
1281
1282 /* Check CRLDP and IDP */
1283
1284 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1285                                 unsigned int *preasons)
1286         {
1287         int i;
1288         if (crl->idp_flags & IDP_ONLYATTR)
1289                 return 0;
1290         if (x->ex_flags & EXFLAG_CA)
1291                 {
1292                 if (crl->idp_flags & IDP_ONLYUSER)
1293                         return 0;
1294                 }
1295         else
1296                 {
1297                 if (crl->idp_flags & IDP_ONLYCA)
1298                         return 0;
1299                 }
1300         *preasons = crl->idp_reasons;
1301         for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
1302                 {
1303                 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1304                 if (crldp_check_crlissuer(dp, crl, crl_score))
1305                         {
1306                         if (!crl->idp ||
1307                              idp_check_dp(dp->distpoint, crl->idp->distpoint))
1308                                 {
1309                                 *preasons &= dp->dp_reasons;
1310                                 return 1;
1311                                 }
1312                         }
1313                 }
1314         if ((!crl->idp || !crl->idp->distpoint) && (crl_score & CRL_SCORE_ISSUER_NAME))
1315                 return 1;
1316         return 0;
1317         }
1318
1319 /* Retrieve CRL corresponding to current certificate.
1320  * If deltas enabled try to find a delta CRL too
1321  */
1322         
1323 static int get_crl_delta(X509_STORE_CTX *ctx,
1324                                 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1325         {
1326         int ok;
1327         X509 *issuer = NULL;
1328         int crl_score = 0;
1329         unsigned int reasons;
1330         X509_CRL *crl = NULL, *dcrl = NULL;
1331         STACK_OF(X509_CRL) *skcrl;
1332         X509_NAME *nm = X509_get_issuer_name(x);
1333         reasons = ctx->current_reasons;
1334         ok = get_crl_sk(ctx, &crl, &dcrl, 
1335                                 &issuer, &crl_score, &reasons, ctx->crls);
1336
1337         if (ok)
1338                 goto done;
1339
1340         /* Lookup CRLs from store */
1341
1342         skcrl = ctx->lookup_crls(ctx, nm);
1343
1344         /* If no CRLs found and a near match from get_crl_sk use that */
1345         if (!skcrl && crl)
1346                 goto done;
1347
1348         get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1349
1350         sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1351
1352         done:
1353
1354         /* If we got any kind of CRL use it and return success */
1355         if (crl)
1356                 {
1357                 ctx->current_issuer = issuer;
1358                 ctx->current_crl_score = crl_score;
1359                 ctx->current_reasons = reasons;
1360                 *pcrl = crl;
1361                 *pdcrl = dcrl;
1362                 return 1;
1363                 }
1364
1365         return 0;
1366         }
1367
1368 /* Check CRL validity */
1369 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1370         {
1371         X509 *issuer = NULL;
1372         EVP_PKEY *ikey = NULL;
1373         int ok = 0, chnum, cnum;
1374         cnum = ctx->error_depth;
1375         chnum = sk_X509_num(ctx->chain) - 1;
1376         /* if we have an alternative CRL issuer cert use that */
1377         if (ctx->current_issuer)
1378                 issuer = ctx->current_issuer;
1379
1380         /* Else find CRL issuer: if not last certificate then issuer
1381          * is next certificate in chain.
1382          */
1383         else if (cnum < chnum)
1384                 issuer = sk_X509_value(ctx->chain, cnum + 1);
1385         else
1386                 {
1387                 issuer = sk_X509_value(ctx->chain, chnum);
1388                 /* If not self signed, can't check signature */
1389                 if(!ctx->check_issued(ctx, issuer, issuer))
1390                         {
1391                         ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1392                         ok = ctx->verify_cb(0, ctx);
1393                         if(!ok) goto err;
1394                         }
1395                 }
1396
1397         if(issuer)
1398                 {
1399                 /* Skip most tests for deltas because they have already
1400                  * been done
1401                  */
1402                 if (!crl->base_crl_number)
1403                         {
1404                         /* Check for cRLSign bit if keyUsage present */
1405                         if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1406                                 !(issuer->ex_kusage & KU_CRL_SIGN))
1407                                 {
1408                                 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1409                                 ok = ctx->verify_cb(0, ctx);
1410                                 if(!ok) goto err;
1411                                 }
1412
1413                         if (!(ctx->current_crl_score & CRL_SCORE_SCOPE))
1414                                 {
1415                                 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1416                                 ok = ctx->verify_cb(0, ctx);
1417                                 if(!ok) goto err;
1418                                 }
1419
1420                         if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH))
1421                                 {
1422                                 if (check_crl_path(ctx, ctx->current_issuer) <= 0)
1423                                         {
1424                                         ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1425                                         ok = ctx->verify_cb(0, ctx);
1426                                         if(!ok) goto err;
1427                                         }
1428                                 }
1429
1430                         if (crl->idp_flags & IDP_INVALID)
1431                                 {
1432                                 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1433                                 ok = ctx->verify_cb(0, ctx);
1434                                 if(!ok) goto err;
1435                                 }
1436
1437
1438                         }
1439
1440                 if (!(ctx->current_crl_score & CRL_SCORE_TIME))
1441                         {
1442                         ok = check_crl_time(ctx, crl, 1);
1443                         if (!ok)
1444                                 goto err;
1445                         }
1446
1447                 /* Attempt to get issuer certificate public key */
1448                 ikey = X509_get_pubkey(issuer);
1449
1450                 if(!ikey)
1451                         {
1452                         ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1453                         ok = ctx->verify_cb(0, ctx);
1454                         if (!ok) goto err;
1455                         }
1456                 else
1457                         {
1458                         /* Verify CRL signature */
1459                         if(X509_CRL_verify(crl, ikey) <= 0)
1460                                 {
1461                                 ctx->error=X509_V_ERR_CRL_SIGNATURE_FAILURE;
1462                                 ok = ctx->verify_cb(0, ctx);
1463                                 if (!ok) goto err;
1464                                 }
1465                         }
1466                 }
1467
1468         ok = 1;
1469
1470         err:
1471         EVP_PKEY_free(ikey);
1472         return ok;
1473         }
1474
1475 /* Check certificate against CRL */
1476 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1477         {
1478         int ok;
1479         X509_REVOKED *rev;
1480         /* The rules changed for this... previously if a CRL contained
1481          * unhandled critical extensions it could still be used to indicate
1482          * a certificate was revoked. This has since been changed since 
1483          * critical extension can change the meaning of CRL entries.
1484          */
1485         if (crl->flags & EXFLAG_CRITICAL)
1486                 {
1487                 if (ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1488                         return 1;
1489                 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1490                 ok = ctx->verify_cb(0, ctx);
1491                 if(!ok)
1492                         return 0;
1493                 }
1494         /* Look for serial number of certificate in CRL
1495          * If found make sure reason is not removeFromCRL.
1496          */
1497         if (X509_CRL_get0_by_cert(crl, &rev, x))
1498                 {
1499                 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1500                         return 2;
1501                 ctx->error = X509_V_ERR_CERT_REVOKED;
1502                 ok = ctx->verify_cb(0, ctx);
1503                 if (!ok)
1504                         return 0;
1505                 }
1506
1507         return 1;
1508         }
1509
1510 static int check_policy(X509_STORE_CTX *ctx)
1511         {
1512         int ret;
1513         if (ctx->parent)
1514                 return 1;
1515         ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1516                                 ctx->param->policies, ctx->param->flags);
1517         if (ret == 0)
1518                 {
1519                 X509err(X509_F_CHECK_POLICY,ERR_R_MALLOC_FAILURE);
1520                 return 0;
1521                 }
1522         /* Invalid or inconsistent extensions */
1523         if (ret == -1)
1524                 {
1525                 /* Locate certificates with bad extensions and notify
1526                  * callback.
1527                  */
1528                 X509 *x;
1529                 int i;
1530                 for (i = 1; i < sk_X509_num(ctx->chain); i++)
1531                         {
1532                         x = sk_X509_value(ctx->chain, i);
1533                         if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1534                                 continue;
1535                         ctx->current_cert = x;
1536                         ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1537                         if(!ctx->verify_cb(0, ctx))
1538                                 return 0;
1539                         }
1540                 return 1;
1541                 }
1542         if (ret == -2)
1543                 {
1544                 ctx->current_cert = NULL;
1545                 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1546                 return ctx->verify_cb(0, ctx);
1547                 }
1548
1549         if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY)
1550                 {
1551                 ctx->current_cert = NULL;
1552                 ctx->error = X509_V_OK;
1553                 if (!ctx->verify_cb(2, ctx))
1554                         return 0;
1555                 }
1556
1557         return 1;
1558         }
1559
1560 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1561         {
1562         time_t *ptime;
1563         int i;
1564
1565         if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1566                 ptime = &ctx->param->check_time;
1567         else
1568                 ptime = NULL;
1569
1570         i=X509_cmp_time(X509_get_notBefore(x), ptime);
1571         if (i == 0)
1572                 {
1573                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1574                 ctx->current_cert=x;
1575                 if (!ctx->verify_cb(0, ctx))
1576                         return 0;
1577                 }
1578
1579         if (i > 0)
1580                 {
1581                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
1582                 ctx->current_cert=x;
1583                 if (!ctx->verify_cb(0, ctx))
1584                         return 0;
1585                 }
1586
1587         i=X509_cmp_time(X509_get_notAfter(x), ptime);
1588         if (i == 0)
1589                 {
1590                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1591                 ctx->current_cert=x;
1592                 if (!ctx->verify_cb(0, ctx))
1593                         return 0;
1594                 }
1595
1596         if (i < 0)
1597                 {
1598                 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
1599                 ctx->current_cert=x;
1600                 if (!ctx->verify_cb(0, ctx))
1601                         return 0;
1602                 }
1603
1604         return 1;
1605         }
1606
1607 static int internal_verify(X509_STORE_CTX *ctx)
1608         {
1609         int ok=0,n;
1610         X509 *xs,*xi;
1611         EVP_PKEY *pkey=NULL;
1612         int (*cb)(int xok,X509_STORE_CTX *xctx);
1613
1614         cb=ctx->verify_cb;
1615
1616         n=sk_X509_num(ctx->chain);
1617         ctx->error_depth=n-1;
1618         n--;
1619         xi=sk_X509_value(ctx->chain,n);
1620
1621         if (ctx->check_issued(ctx, xi, xi))
1622                 xs=xi;
1623         else
1624                 {
1625                 if (n <= 0)
1626                         {
1627                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1628                         ctx->current_cert=xi;
1629                         ok=cb(0,ctx);
1630                         goto end;
1631                         }
1632                 else
1633                         {
1634                         n--;
1635                         ctx->error_depth=n;
1636                         xs=sk_X509_value(ctx->chain,n);
1637                         }
1638                 }
1639
1640 /*      ctx->error=0;  not needed */
1641         while (n >= 0)
1642                 {
1643                 ctx->error_depth=n;
1644
1645                 /* Skip signature check for self signed certificates unless
1646                  * explicitly asked for. It doesn't add any security and
1647                  * just wastes time.
1648                  */
1649                 if (!xs->valid && (xs != xi || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE)))
1650                         {
1651                         if ((pkey=X509_get_pubkey(xi)) == NULL)
1652                                 {
1653                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1654                                 ctx->current_cert=xi;
1655                                 ok=(*cb)(0,ctx);
1656                                 if (!ok) goto end;
1657                                 }
1658                         else if (X509_verify(xs,pkey) <= 0)
1659                                 {
1660                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
1661                                 ctx->current_cert=xs;
1662                                 ok=(*cb)(0,ctx);
1663                                 if (!ok)
1664                                         {
1665                                         EVP_PKEY_free(pkey);
1666                                         goto end;
1667                                         }
1668                                 }
1669                         EVP_PKEY_free(pkey);
1670                         pkey=NULL;
1671                         }
1672
1673                 xs->valid = 1;
1674
1675                 ok = check_cert_time(ctx, xs);
1676                 if (!ok)
1677                         goto end;
1678
1679                 /* The last error (if any) is still in the error value */
1680                 ctx->current_issuer=xi;
1681                 ctx->current_cert=xs;
1682                 ok=(*cb)(1,ctx);
1683                 if (!ok) goto end;
1684
1685                 n--;
1686                 if (n >= 0)
1687                         {
1688                         xi=xs;
1689                         xs=sk_X509_value(ctx->chain,n);
1690                         }
1691                 }
1692         ok=1;
1693 end:
1694         return ok;
1695         }
1696
1697 int X509_cmp_current_time(const ASN1_TIME *ctm)
1698 {
1699         return X509_cmp_time(ctm, NULL);
1700 }
1701
1702 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1703         {
1704         char *str;
1705         ASN1_TIME atm;
1706         long offset;
1707         char buff1[24],buff2[24],*p;
1708         int i,j;
1709
1710         p=buff1;
1711         i=ctm->length;
1712         str=(char *)ctm->data;
1713         if (ctm->type == V_ASN1_UTCTIME)
1714                 {
1715                 if ((i < 11) || (i > 17)) return 0;
1716                 memcpy(p,str,10);
1717                 p+=10;
1718                 str+=10;
1719                 }
1720         else
1721                 {
1722                 if (i < 13) return 0;
1723                 memcpy(p,str,12);
1724                 p+=12;
1725                 str+=12;
1726                 }
1727
1728         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
1729                 { *(p++)='0'; *(p++)='0'; }
1730         else
1731                 { 
1732                 *(p++)= *(str++);
1733                 *(p++)= *(str++);
1734                 /* Skip any fractional seconds... */
1735                 if (*str == '.')
1736                         {
1737                         str++;
1738                         while ((*str >= '0') && (*str <= '9')) str++;
1739                         }
1740                 
1741                 }
1742         *(p++)='Z';
1743         *(p++)='\0';
1744
1745         if (*str == 'Z')
1746                 offset=0;
1747         else
1748                 {
1749                 if ((*str != '+') && (*str != '-'))
1750                         return 0;
1751                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
1752                 offset+=(str[3]-'0')*10+(str[4]-'0');
1753                 if (*str == '-')
1754                         offset= -offset;
1755                 }
1756         atm.type=ctm->type;
1757         atm.flags = 0;
1758         atm.length=sizeof(buff2);
1759         atm.data=(unsigned char *)buff2;
1760
1761         if (X509_time_adj(&atm,-offset*60, cmp_time) == NULL)
1762                 return 0;
1763
1764         if (ctm->type == V_ASN1_UTCTIME)
1765                 {
1766                 i=(buff1[0]-'0')*10+(buff1[1]-'0');
1767                 if (i < 50) i+=100; /* cf. RFC 2459 */
1768                 j=(buff2[0]-'0')*10+(buff2[1]-'0');
1769                 if (j < 50) j+=100;
1770
1771                 if (i < j) return -1;
1772                 if (i > j) return 1;
1773                 }
1774         i=strcmp(buff1,buff2);
1775         if (i == 0) /* wait a second then return younger :-) */
1776                 return -1;
1777         else
1778                 return i;
1779         }
1780
1781 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1782 {
1783         return X509_time_adj(s, adj, NULL);
1784 }
1785
1786 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1787         {
1788         return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1789         }
1790
1791 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1792                                 int offset_day, long offset_sec, time_t *in_tm)
1793         {
1794         time_t t;
1795
1796         if (in_tm) t = *in_tm;
1797         else time(&t);
1798
1799         if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING))
1800                 {
1801                 if (s->type == V_ASN1_UTCTIME)
1802                         return ASN1_UTCTIME_adj(s,t, offset_day, offset_sec);
1803                 if (s->type == V_ASN1_GENERALIZEDTIME)
1804                         return ASN1_GENERALIZEDTIME_adj(s, t, offset_day,
1805                                                                 offset_sec);
1806                 }
1807         return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1808         }
1809
1810 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1811         {
1812         EVP_PKEY *ktmp=NULL,*ktmp2;
1813         int i,j;
1814
1815         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
1816
1817         for (i=0; i<sk_X509_num(chain); i++)
1818                 {
1819                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
1820                 if (ktmp == NULL)
1821                         {
1822                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1823                         return 0;
1824                         }
1825                 if (!EVP_PKEY_missing_parameters(ktmp))
1826                         break;
1827                 else
1828                         {
1829                         EVP_PKEY_free(ktmp);
1830                         ktmp=NULL;
1831                         }
1832                 }
1833         if (ktmp == NULL)
1834                 {
1835                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1836                 return 0;
1837                 }
1838
1839         /* first, populate the other certs */
1840         for (j=i-1; j >= 0; j--)
1841                 {
1842                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
1843                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
1844                 EVP_PKEY_free(ktmp2);
1845                 }
1846         
1847         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
1848         EVP_PKEY_free(ktmp);
1849         return 1;
1850         }
1851
1852 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
1853              CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
1854         {
1855         /* This function is (usually) called only once, by
1856          * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c). */
1857         return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
1858                         new_func, dup_func, free_func);
1859         }
1860
1861 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
1862         {
1863         return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
1864         }
1865
1866 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
1867         {
1868         return CRYPTO_get_ex_data(&ctx->ex_data,idx);
1869         }
1870
1871 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
1872         {
1873         return ctx->error;
1874         }
1875
1876 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
1877         {
1878         ctx->error=err;
1879         }
1880
1881 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
1882         {
1883         return ctx->error_depth;
1884         }
1885
1886 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
1887         {
1888         return ctx->current_cert;
1889         }
1890
1891 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
1892         {
1893         return ctx->chain;
1894         }
1895
1896 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
1897         {
1898         int i;
1899         X509 *x;
1900         STACK_OF(X509) *chain;
1901         if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
1902         for (i = 0; i < sk_X509_num(chain); i++)
1903                 {
1904                 x = sk_X509_value(chain, i);
1905                 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
1906                 }
1907         return chain;
1908         }
1909
1910 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
1911         {
1912         return ctx->current_issuer;
1913         }
1914
1915 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
1916         {
1917         return ctx->current_crl;
1918         }
1919
1920 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
1921         {
1922         return ctx->parent;
1923         }
1924
1925 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
1926         {
1927         ctx->cert=x;
1928         }
1929
1930 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
1931         {
1932         ctx->untrusted=sk;
1933         }
1934
1935 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
1936         {
1937         ctx->crls=sk;
1938         }
1939
1940 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
1941         {
1942         return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
1943         }
1944
1945 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
1946         {
1947         return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
1948         }
1949
1950 /* This function is used to set the X509_STORE_CTX purpose and trust
1951  * values. This is intended to be used when another structure has its
1952  * own trust and purpose values which (if set) will be inherited by
1953  * the ctx. If they aren't set then we will usually have a default
1954  * purpose in mind which should then be used to set the trust value.
1955  * An example of this is SSL use: an SSL structure will have its own
1956  * purpose and trust settings which the application can set: if they
1957  * aren't set then we use the default of SSL client/server.
1958  */
1959
1960 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
1961                                 int purpose, int trust)
1962 {
1963         int idx;
1964         /* If purpose not set use default */
1965         if (!purpose) purpose = def_purpose;
1966         /* If we have a purpose then check it is valid */
1967         if (purpose)
1968                 {
1969                 X509_PURPOSE *ptmp;
1970                 idx = X509_PURPOSE_get_by_id(purpose);
1971                 if (idx == -1)
1972                         {
1973                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1974                                                 X509_R_UNKNOWN_PURPOSE_ID);
1975                         return 0;
1976                         }
1977                 ptmp = X509_PURPOSE_get0(idx);
1978                 if (ptmp->trust == X509_TRUST_DEFAULT)
1979                         {
1980                         idx = X509_PURPOSE_get_by_id(def_purpose);
1981                         if (idx == -1)
1982                                 {
1983                                 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1984                                                 X509_R_UNKNOWN_PURPOSE_ID);
1985                                 return 0;
1986                                 }
1987                         ptmp = X509_PURPOSE_get0(idx);
1988                         }
1989                 /* If trust not set then get from purpose default */
1990                 if (!trust) trust = ptmp->trust;
1991                 }
1992         if (trust)
1993                 {
1994                 idx = X509_TRUST_get_by_id(trust);
1995                 if (idx == -1)
1996                         {
1997                         X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
1998                                                 X509_R_UNKNOWN_TRUST_ID);
1999                         return 0;
2000                         }
2001                 }
2002
2003         if (purpose && !ctx->param->purpose) ctx->param->purpose = purpose;
2004         if (trust && !ctx->param->trust) ctx->param->trust = trust;
2005         return 1;
2006 }
2007
2008 X509_STORE_CTX *X509_STORE_CTX_new(void)
2009 {
2010         X509_STORE_CTX *ctx;
2011         ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2012         if (!ctx)
2013                 {
2014                 X509err(X509_F_X509_STORE_CTX_NEW,ERR_R_MALLOC_FAILURE);
2015                 return NULL;
2016                 }
2017         memset(ctx, 0, sizeof(X509_STORE_CTX));
2018         return ctx;
2019 }
2020
2021 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2022 {
2023         X509_STORE_CTX_cleanup(ctx);
2024         OPENSSL_free(ctx);
2025 }
2026
2027 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2028              STACK_OF(X509) *chain)
2029         {
2030         int ret = 1;
2031         ctx->ctx=store;
2032         ctx->current_method=0;
2033         ctx->cert=x509;
2034         ctx->untrusted=chain;
2035         ctx->crls = NULL;
2036         ctx->last_untrusted=0;
2037         ctx->other_ctx=NULL;
2038         ctx->valid=0;
2039         ctx->chain=NULL;
2040         ctx->error=0;
2041         ctx->explicit_policy=0;
2042         ctx->error_depth=0;
2043         ctx->current_cert=NULL;
2044         ctx->current_issuer=NULL;
2045         ctx->tree = NULL;
2046         ctx->parent = NULL;
2047
2048         ctx->param = X509_VERIFY_PARAM_new();
2049
2050         if (!ctx->param)
2051                 {
2052                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2053                 return 0;
2054                 }
2055
2056         /* Inherit callbacks and flags from X509_STORE if not set
2057          * use defaults.
2058          */
2059
2060
2061         if (store)
2062                 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2063         else
2064                 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT|X509_VP_FLAG_ONCE;
2065
2066         if (store)
2067                 {
2068                 ctx->verify_cb = store->verify_cb;
2069                 ctx->cleanup = store->cleanup;
2070                 }
2071         else
2072                 ctx->cleanup = 0;
2073
2074         if (ret)
2075                 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2076                                         X509_VERIFY_PARAM_lookup("default"));
2077
2078         if (ret == 0)
2079                 {
2080                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2081                 return 0;
2082                 }
2083
2084         if (store && store->check_issued)
2085                 ctx->check_issued = store->check_issued;
2086         else
2087                 ctx->check_issued = check_issued;
2088
2089         if (store && store->get_issuer)
2090                 ctx->get_issuer = store->get_issuer;
2091         else
2092                 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2093
2094         if (store && store->verify_cb)
2095                 ctx->verify_cb = store->verify_cb;
2096         else
2097                 ctx->verify_cb = null_callback;
2098
2099         if (store && store->verify)
2100                 ctx->verify = store->verify;
2101         else
2102                 ctx->verify = internal_verify;
2103
2104         if (store && store->check_revocation)
2105                 ctx->check_revocation = store->check_revocation;
2106         else
2107                 ctx->check_revocation = check_revocation;
2108
2109         if (store && store->get_crl)
2110                 ctx->get_crl = store->get_crl;
2111         else
2112                 ctx->get_crl = NULL;
2113
2114         if (store && store->check_crl)
2115                 ctx->check_crl = store->check_crl;
2116         else
2117                 ctx->check_crl = check_crl;
2118
2119         if (store && store->cert_crl)
2120                 ctx->cert_crl = store->cert_crl;
2121         else
2122                 ctx->cert_crl = cert_crl;
2123
2124         if (store && store->lookup_certs)
2125                 ctx->lookup_certs = store->lookup_certs;
2126         else
2127                 ctx->lookup_certs = X509_STORE_get1_certs;
2128
2129         if (store && store->lookup_crls)
2130                 ctx->lookup_crls = store->lookup_crls;
2131         else
2132                 ctx->lookup_crls = X509_STORE_get1_crls;
2133
2134         ctx->check_policy = check_policy;
2135
2136
2137         /* This memset() can't make any sense anyway, so it's removed. As
2138          * X509_STORE_CTX_cleanup does a proper "free" on the ex_data, we put a
2139          * corresponding "new" here and remove this bogus initialisation. */
2140         /* memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA)); */
2141         if(!CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2142                                 &(ctx->ex_data)))
2143                 {
2144                 OPENSSL_free(ctx);
2145                 X509err(X509_F_X509_STORE_CTX_INIT,ERR_R_MALLOC_FAILURE);
2146                 return 0;
2147                 }
2148         return 1;
2149         }
2150
2151 /* Set alternative lookup method: just a STACK of trusted certificates.
2152  * This avoids X509_STORE nastiness where it isn't needed.
2153  */
2154
2155 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2156 {
2157         ctx->other_ctx = sk;
2158         ctx->get_issuer = get_issuer_sk;
2159 }
2160
2161 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2162         {
2163         if (ctx->cleanup) ctx->cleanup(ctx);
2164         if (ctx->param != NULL)
2165                 {
2166                 if (ctx->parent == NULL)
2167                         X509_VERIFY_PARAM_free(ctx->param);
2168                 ctx->param=NULL;
2169                 }
2170         if (ctx->tree != NULL)
2171                 {
2172                 X509_policy_tree_free(ctx->tree);
2173                 ctx->tree=NULL;
2174                 }
2175         if (ctx->chain != NULL)
2176                 {
2177                 sk_X509_pop_free(ctx->chain,X509_free);
2178                 ctx->chain=NULL;
2179                 }
2180         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2181         memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
2182         }
2183
2184 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2185         {
2186         X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2187         }
2188
2189 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2190         {
2191         X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2192         }
2193
2194 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags, time_t t)
2195         {
2196         X509_VERIFY_PARAM_set_time(ctx->param, t);
2197         }
2198
2199 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2200                                   int (*verify_cb)(int, X509_STORE_CTX *))
2201         {
2202         ctx->verify_cb=verify_cb;
2203         }
2204
2205 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2206         {
2207         return ctx->tree;
2208         }
2209
2210 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2211         {
2212         return ctx->explicit_policy;
2213         }
2214
2215 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2216         {
2217         const X509_VERIFY_PARAM *param;
2218         param = X509_VERIFY_PARAM_lookup(name);
2219         if (!param)
2220                 return 0;
2221         return X509_VERIFY_PARAM_inherit(ctx->param, param);
2222         }
2223
2224 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2225         {
2226         return ctx->param;
2227         }
2228
2229 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2230         {
2231         if (ctx->param)
2232                 X509_VERIFY_PARAM_free(ctx->param);
2233         ctx->param = param;
2234         }
2235
2236 IMPLEMENT_STACK_OF(X509)
2237 IMPLEMENT_ASN1_SET_OF(X509)
2238
2239 IMPLEMENT_STACK_OF(X509_NAME)
2240
2241 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2242 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)