3d35cac5462a8ba0311ad3b422d9a78eb2454598
[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 #include <sys/types.h>
63 #include <sys/stat.h>
64
65 #include <openssl/crypto.h>
66 #include "cryptlib.h"
67 #include <openssl/lhash.h>
68 #include <openssl/buffer.h>
69 #include <openssl/evp.h>
70 #include <openssl/asn1.h>
71 #include <openssl/x509.h>
72 #include <openssl/objects.h>
73
74 static int null_callback(int ok,X509_STORE_CTX *e);
75 static int internal_verify(X509_STORE_CTX *ctx);
76 const char *X509_version="X.509" OPENSSL_VERSION_PTEXT;
77
78 static STACK *x509_store_ctx_method=NULL;
79 static int x509_store_ctx_num=0;
80 #if 0
81 static int x509_store_num=1;
82 static STACK *x509_store_method=NULL;
83 #endif
84
85 static int null_callback(int ok, X509_STORE_CTX *e)
86         {
87         return(ok);
88         }
89
90 #if 0
91 static int x509_subject_cmp(X509 **a, X509 **b)
92         {
93         return(X509_subject_name_cmp(*a,*b));
94         }
95 #endif
96
97 int X509_verify_cert(X509_STORE_CTX *ctx)
98         {
99         X509 *x,*xtmp,*chain_ss=NULL;
100         X509_NAME *xn;
101         X509_OBJECT obj;
102         int depth,i,ok=0;
103         int num;
104         int (*cb)();
105         STACK_OF(X509) *sktmp=NULL;
106
107         if (ctx->cert == NULL)
108                 {
109                 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
110                 return(-1);
111                 }
112
113         cb=ctx->ctx->verify_cb;
114         if (cb == NULL) cb=null_callback;
115
116         /* first we make sure the chain we are going to build is
117          * present and that the first entry is in place */
118         if (ctx->chain == NULL)
119                 {
120                 if (    ((ctx->chain=sk_X509_new_null()) == NULL) ||
121                         (!sk_X509_push(ctx->chain,ctx->cert)))
122                         {
123                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
124                         goto end;
125                         }
126                 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
127                 ctx->last_untrusted=1;
128                 }
129
130         /* We use a temporary so we can chop and hack at it */
131         if (ctx->untrusted != NULL
132             && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
133                 {
134                 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
135                 goto end;
136                 }
137
138         num=sk_X509_num(ctx->chain);
139         x=sk_X509_value(ctx->chain,num-1);
140         depth=ctx->depth;
141
142
143         for (;;)
144                 {
145                 /* If we have enough, we break */
146                 if (depth < num) break; /* FIXME: If this happens, we should take
147                                                                  * note of it and, if appropriate, use the
148                                                                  * X509_V_ERR_CERT_CHAIN_TOO_LONG error
149                                                                  * code later.
150                                                                  */
151
152                 /* If we are self signed, we break */
153                 xn=X509_get_issuer_name(x);
154                 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
155                         break;
156
157                 /* If we were passed a cert chain, use it first */
158                 if (ctx->untrusted != NULL)
159                         {
160                         xtmp=X509_find_by_subject(sktmp,xn);
161                         if (xtmp != NULL)
162                                 {
163                                 if (!sk_X509_push(ctx->chain,xtmp))
164                                         {
165                                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
166                                         goto end;
167                                         }
168                                 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
169                                 sk_X509_delete_ptr(sktmp,xtmp);
170                                 ctx->last_untrusted++;
171                                 x=xtmp;
172                                 num++;
173                                 /* reparse the full chain for
174                                  * the next one */
175                                 continue;
176                                 }
177                         }
178                 break;
179                 }
180
181         /* at this point, chain should contain a list of untrusted
182          * certificates.  We now need to add at least one trusted one,
183          * if possible, otherwise we complain. */
184
185         i=sk_X509_num(ctx->chain);
186         x=sk_X509_value(ctx->chain,i-1);
187         if (X509_NAME_cmp(X509_get_subject_name(x),X509_get_issuer_name(x))
188                 == 0)
189                 {
190                 /* we have a self signed certificate */
191                 if (sk_X509_num(ctx->chain) == 1)
192                         {
193                         ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
194                         ctx->current_cert=x;
195                         ctx->error_depth=i-1;
196                         ok=cb(0,ctx);
197                         if (!ok) goto end;
198                         }
199                 else
200                         {
201                         /* worry more about this one elsewhere */
202                         chain_ss=sk_X509_pop(ctx->chain);
203                         ctx->last_untrusted--;
204                         num--;
205                         x=sk_X509_value(ctx->chain,num-1);
206                         }
207                 }
208
209         /* We now lookup certs from the certificate store */
210         for (;;)
211                 {
212                 /* If we have enough, we break */
213                 if (depth < num) break;
214
215                 /* If we are self signed, we break */
216                 xn=X509_get_issuer_name(x);
217                 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
218                         break;
219
220                 ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
221                 if (ok != X509_LU_X509)
222                         {
223                         if (ok == X509_LU_RETRY)
224                                 {
225                                 X509_OBJECT_free_contents(&obj);
226                                 X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
227                                 return(ok);
228                                 }
229                         else if (ok != X509_LU_FAIL)
230                                 {
231                                 X509_OBJECT_free_contents(&obj);
232                                 /* not good :-(, break anyway */
233                                 return(ok);
234                                 }
235                         break;
236                         }
237                 x=obj.data.x509;
238                 if (!sk_X509_push(ctx->chain,obj.data.x509))
239                         {
240                         X509_OBJECT_free_contents(&obj);
241                         X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
242                         return(0);
243                         }
244                 num++;
245                 }
246
247         /* we now have our chain, lets check it... */
248         xn=X509_get_issuer_name(x);
249         if (X509_NAME_cmp(X509_get_subject_name(x),xn) != 0)
250                 {
251                 if ((chain_ss == NULL) || (X509_NAME_cmp(X509_get_subject_name(chain_ss),xn) != 0))
252                         {
253                         if (ctx->last_untrusted >= num)
254                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
255                         else
256                                 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
257                         ctx->current_cert=x;
258                         }
259                 else
260                         {
261
262                         sk_X509_push(ctx->chain,chain_ss);
263                         num++;
264                         ctx->last_untrusted=num;
265                         ctx->current_cert=chain_ss;
266                         ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
267                         chain_ss=NULL;
268                         }
269
270                 ctx->error_depth=num-1;
271                 ok=cb(0,ctx);
272                 if (!ok) goto end;
273                 }
274
275         /* We may as well copy down any DSA parameters that are required */
276         X509_get_pubkey_parameters(NULL,ctx->chain);
277
278         /* At this point, we have a chain and just need to verify it */
279         if (ctx->ctx->verify != NULL)
280                 ok=ctx->ctx->verify(ctx);
281         else
282                 ok=internal_verify(ctx);
283         if (0)
284                 {
285 end:
286                 X509_get_pubkey_parameters(NULL,ctx->chain);
287                 }
288         if (sktmp != NULL) sk_X509_free(sktmp);
289         if (chain_ss != NULL) X509_free(chain_ss);
290         return(ok);
291         }
292
293 static int internal_verify(X509_STORE_CTX *ctx)
294         {
295         int i,ok=0,n;
296         X509 *xs,*xi;
297         EVP_PKEY *pkey=NULL;
298         int (*cb)();
299
300         cb=ctx->ctx->verify_cb;
301         if (cb == NULL) cb=null_callback;
302
303         n=sk_X509_num(ctx->chain);
304         ctx->error_depth=n-1;
305         n--;
306         xi=sk_X509_value(ctx->chain,n);
307         if (X509_NAME_cmp(X509_get_subject_name(xi),
308                 X509_get_issuer_name(xi)) == 0)
309                 xs=xi;
310         else
311                 {
312                 if (n <= 0)
313                         {
314                         ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
315                         ctx->current_cert=xi;
316                         ok=cb(0,ctx);
317                         goto end;
318                         }
319                 else
320                         {
321                         n--;
322                         ctx->error_depth=n;
323                         xs=sk_X509_value(ctx->chain,n);
324                         }
325                 }
326
327 /*      ctx->error=0;  not needed */
328         while (n >= 0)
329                 {
330                 ctx->error_depth=n;
331                 if (!xs->valid)
332                         {
333                         if ((pkey=X509_get_pubkey(xi)) == NULL)
334                                 {
335                                 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
336                                 ctx->current_cert=xi;
337                                 ok=(*cb)(0,ctx);
338                                 if (!ok) goto end;
339                                 }
340                         if (X509_verify(xs,pkey) <= 0)
341                                 {
342                                 EVP_PKEY_free(pkey);
343                                 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
344                                 ctx->current_cert=xs;
345                                 ok=(*cb)(0,ctx);
346                                 if (!ok) goto end;
347                                 }
348                         EVP_PKEY_free(pkey);
349                         pkey=NULL;
350
351                         i=X509_cmp_current_time(X509_get_notBefore(xs));
352                         if (i == 0)
353                                 {
354                                 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
355                                 ctx->current_cert=xs;
356                                 ok=(*cb)(0,ctx);
357                                 if (!ok) goto end;
358                                 }
359                         if (i > 0)
360                                 {
361                                 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
362                                 ctx->current_cert=xs;
363                                 ok=(*cb)(0,ctx);
364                                 if (!ok) goto end;
365                                 }
366                         xs->valid=1;
367                         }
368
369                 i=X509_cmp_current_time(X509_get_notAfter(xs));
370                 if (i == 0)
371                         {
372                         ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
373                         ctx->current_cert=xs;
374                         ok=(*cb)(0,ctx);
375                         if (!ok) goto end;
376                         }
377
378                 if (i < 0)
379                         {
380                         ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
381                         ctx->current_cert=xs;
382                         ok=(*cb)(0,ctx);
383                         if (!ok) goto end;
384                         }
385
386                 /* CRL CHECK */
387
388                 /* The last error (if any) is still in the error value */
389                 ctx->current_cert=xs;
390                 ok=(*cb)(1,ctx);
391                 if (!ok) goto end;
392
393                 n--;
394                 if (n >= 0)
395                         {
396                         xi=xs;
397                         xs=sk_X509_value(ctx->chain,n);
398                         }
399                 }
400         ok=1;
401 end:
402         return(ok);
403         }
404
405 int X509_cmp_current_time(ASN1_UTCTIME *ctm)
406         {
407         char *str;
408         ASN1_UTCTIME atm;
409         time_t offset;
410         char buff1[24],buff2[24],*p;
411         int i,j;
412
413         p=buff1;
414         i=ctm->length;
415         str=(char *)ctm->data;
416         if ((i < 11) || (i > 17)) return(0);
417         memcpy(p,str,10);
418         p+=10;
419         str+=10;
420
421         if ((*str == 'Z') || (*str == '-') || (*str == '+'))
422                 { *(p++)='0'; *(p++)='0'; }
423         else    { *(p++)= *(str++); *(p++)= *(str++); }
424         *(p++)='Z';
425         *(p++)='\0';
426
427         if (*str == 'Z')
428                 offset=0;
429         else
430                 {
431                 if ((*str != '+') && (str[5] != '-'))
432                         return(0);
433                 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
434                 offset+=(str[3]-'0')*10+(str[4]-'0');
435                 if (*str == '-')
436                         offset= -offset;
437                 }
438         atm.type=V_ASN1_UTCTIME;
439         atm.length=sizeof(buff2);
440         atm.data=(unsigned char *)buff2;
441
442         X509_gmtime_adj(&atm,-offset);
443
444         i=(buff1[0]-'0')*10+(buff1[1]-'0');
445         if (i < 50) i+=100; /* cf. RFC 2459 */
446         j=(buff2[0]-'0')*10+(buff2[1]-'0');
447         if (j < 50) j+=100;
448
449         if (i < j) return (-1);
450         if (i > j) return (1);
451         i=strcmp(buff1,buff2);
452         if (i == 0) /* wait a second then return younger :-) */
453                 return(-1);
454         else
455                 return(i);
456         }
457
458 ASN1_UTCTIME *X509_gmtime_adj(ASN1_UTCTIME *s, long adj)
459         {
460         time_t t;
461
462         time(&t);
463         t+=adj;
464         return(ASN1_UTCTIME_set(s,t));
465         }
466
467 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
468         {
469         EVP_PKEY *ktmp=NULL,*ktmp2;
470         int i,j;
471
472         if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return(1);
473
474         for (i=0; i<sk_X509_num(chain); i++)
475                 {
476                 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
477                 if (ktmp == NULL)
478                         {
479                         X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
480                         return(0);
481                         }
482                 if (!EVP_PKEY_missing_parameters(ktmp))
483                         break;
484                 else
485                         {
486                         EVP_PKEY_free(ktmp);
487                         ktmp=NULL;
488                         }
489                 }
490         if (ktmp == NULL)
491                 {
492                 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
493                 return(0);
494                 }
495
496         /* first, populate the other certs */
497         for (j=i-1; j >= 0; j--)
498                 {
499                 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
500                 EVP_PKEY_copy_parameters(ktmp2,ktmp);
501                 EVP_PKEY_free(ktmp2);
502                 }
503         
504         if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
505         EVP_PKEY_free(ktmp);
506         return(1);
507         }
508
509 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
510         {
511         X509_OBJECT *obj,*r;
512         int ret=1;
513
514         if (x == NULL) return(0);
515         obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
516         if (obj == NULL)
517                 {
518                 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
519                 return(0);
520                 }
521         obj->type=X509_LU_X509;
522         obj->data.x509=x;
523
524         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
525
526         X509_OBJECT_up_ref_count(obj);
527
528         r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
529         if (r != NULL)
530                 { /* oops, put it back */
531                 lh_delete(ctx->certs,(char *)obj);
532                 X509_OBJECT_free_contents(obj);
533                 Free(obj);
534                 lh_insert(ctx->certs,(char *)r);
535                 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
536                 ret=0;
537                 }
538
539         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
540
541         return(ret);    
542         }
543
544 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
545         {
546         X509_OBJECT *obj,*r;
547         int ret=1;
548
549         if (x == NULL) return(0);
550         obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
551         if (obj == NULL)
552                 {
553                 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
554                 return(0);
555                 }
556         obj->type=X509_LU_CRL;
557         obj->data.crl=x;
558
559         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
560
561         X509_OBJECT_up_ref_count(obj);
562
563         r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
564         if (r != NULL)
565                 { /* oops, put it back */
566                 lh_delete(ctx->certs,(char *)obj);
567                 X509_OBJECT_free_contents(obj);
568                 Free(obj);
569                 lh_insert(ctx->certs,(char *)r);
570                 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
571                 ret=0;
572                 }
573
574         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
575
576         return(ret);    
577         }
578
579 int X509_STORE_CTX_get_ex_new_index(long argl, char *argp, int (*new_func)(),
580              int (*dup_func)(), void (*free_func)())
581         {
582         x509_store_ctx_num++;
583         return(CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
584                 &x509_store_ctx_method,
585                 argl,argp,new_func,dup_func,free_func));
586         }
587
588 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
589         {
590         return(CRYPTO_set_ex_data(&ctx->ex_data,idx,data));
591         }
592
593 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
594         {
595         return(CRYPTO_get_ex_data(&ctx->ex_data,idx));
596         }
597
598 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
599         {
600         return(ctx->error);
601         }
602
603 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
604         {
605         ctx->error=err;
606         }
607
608 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
609         {
610         return(ctx->error_depth);
611         }
612
613 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
614         {
615         return(ctx->current_cert);
616         }
617
618 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
619         {
620         return(ctx->chain);
621         }
622
623 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
624         {
625         ctx->cert=x;
626         }
627
628 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
629         {
630         ctx->untrusted=sk;
631         }
632
633 IMPLEMENT_STACK_OF(X509)
634 IMPLEMENT_ASN1_SET_OF(X509)
635
636 IMPLEMENT_STACK_OF(X509_NAME)
637
638 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
639 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)