fe9fbca315e60f8c9adf81e8967139ca7e4c8a93
[openssl.git] / crypto / x509 / x509_lu.c
1 /* crypto/x509/x509_lu.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 "cryptlib.h"
61 #include <openssl/lhash.h>
62 #include <openssl/x509.h>
63
64 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *x509_store_meth=NULL;
65
66 X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method)
67         {
68         X509_LOOKUP *ret;
69
70         ret=(X509_LOOKUP *)OPENSSL_malloc(sizeof(X509_LOOKUP));
71         if (ret == NULL) return NULL;
72
73         ret->init=0;
74         ret->skip=0;
75         ret->method=method;
76         ret->method_data=NULL;
77         ret->store_ctx=NULL;
78         if ((method->new_item != NULL) && !method->new_item(ret))
79                 {
80                 OPENSSL_free(ret);
81                 return NULL;
82                 }
83         return ret;
84         }
85
86 void X509_LOOKUP_free(X509_LOOKUP *ctx)
87         {
88         if (ctx == NULL) return;
89         if (    (ctx->method != NULL) &&
90                 (ctx->method->free != NULL))
91                 ctx->method->free(ctx);
92         OPENSSL_free(ctx);
93         }
94
95 int X509_LOOKUP_init(X509_LOOKUP *ctx)
96         {
97         if (ctx->method == NULL) return 0;
98         if (ctx->method->init != NULL)
99                 return ctx->method->init(ctx);
100         else
101                 return 1;
102         }
103
104 int X509_LOOKUP_shutdown(X509_LOOKUP *ctx)
105         {
106         if (ctx->method == NULL) return 0;
107         if (ctx->method->shutdown != NULL)
108                 return ctx->method->shutdown(ctx);
109         else
110                 return 1;
111         }
112
113 int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc, long argl,
114              char **ret)
115         {
116         if (ctx->method == NULL) return -1;
117         if (ctx->method->ctrl != NULL)
118                 return ctx->method->ctrl(ctx,cmd,argc,argl,ret);
119         else
120                 return 1;
121         }
122
123 int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, int type, X509_NAME *name,
124              X509_OBJECT *ret)
125         {
126         if ((ctx->method == NULL) || (ctx->method->get_by_subject == NULL))
127                 return X509_LU_FAIL;
128         if (ctx->skip) return 0;
129         return ctx->method->get_by_subject(ctx,type,name,ret);
130         }
131
132 int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, int type, X509_NAME *name,
133              ASN1_INTEGER *serial, X509_OBJECT *ret)
134         {
135         if ((ctx->method == NULL) ||
136                 (ctx->method->get_by_issuer_serial == NULL))
137                 return X509_LU_FAIL;
138         return ctx->method->get_by_issuer_serial(ctx,type,name,serial,ret);
139         }
140
141 int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, int type,
142              unsigned char *bytes, int len, X509_OBJECT *ret)
143         {
144         if ((ctx->method == NULL) || (ctx->method->get_by_fingerprint == NULL))
145                 return X509_LU_FAIL;
146         return ctx->method->get_by_fingerprint(ctx,type,bytes,len,ret);
147         }
148
149 int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, int type, char *str, int len,
150              X509_OBJECT *ret)
151         {
152         if ((ctx->method == NULL) || (ctx->method->get_by_alias == NULL))
153                 return X509_LU_FAIL;
154         return ctx->method->get_by_alias(ctx,type,str,len,ret);
155         }
156
157   
158 static int x509_object_cmp(const X509_OBJECT * const *a, const X509_OBJECT * const *b)
159         {
160         int ret;
161
162         ret=((*a)->type - (*b)->type);
163         if (ret) return ret;
164         switch ((*a)->type)
165                 {
166         case X509_LU_X509:
167                 ret=X509_subject_name_cmp((*a)->data.x509,(*b)->data.x509);
168                 break;
169         case X509_LU_CRL:
170                 ret=X509_CRL_cmp((*a)->data.crl,(*b)->data.crl);
171                 break;
172         default:
173                 /* abort(); */
174                 return 0;
175                 }
176         return ret;
177         }
178
179 X509_STORE *X509_STORE_new(void)
180         {
181         X509_STORE *ret;
182
183         if ((ret=(X509_STORE *)OPENSSL_malloc(sizeof(X509_STORE))) == NULL)
184                 return NULL;
185         ret->objs = sk_X509_OBJECT_new(x509_object_cmp);
186         ret->cache=1;
187         ret->get_cert_methods=sk_X509_LOOKUP_new_null();
188         ret->verify=0;
189         ret->verify_cb=0;
190
191         ret->purpose = 0;
192         ret->trust = 0;
193
194         ret->flags = 0;
195
196         ret->get_issuer = 0;
197         ret->check_issued = 0;
198         ret->check_revocation = 0;
199         ret->get_crl = 0;
200         ret->check_crl = 0;
201         ret->cert_crl = 0;
202         ret->cleanup = 0;
203
204         memset(&ret->ex_data,0,sizeof(CRYPTO_EX_DATA));
205         ret->references=1;
206         ret->depth=0;
207         return ret;
208         }
209
210 static void cleanup(X509_OBJECT *a)
211         {
212         if (a->type == X509_LU_X509)
213                 {
214                 X509_free(a->data.x509);
215                 }
216         else if (a->type == X509_LU_CRL)
217                 {
218                 X509_CRL_free(a->data.crl);
219                 }
220         else
221                 {
222                 /* abort(); */
223                 }
224
225         OPENSSL_free(a);
226         }
227
228 void X509_STORE_free(X509_STORE *vfy)
229         {
230         int i;
231         STACK_OF(X509_LOOKUP) *sk;
232         X509_LOOKUP *lu;
233
234         if (vfy == NULL)
235             return;
236
237         sk=vfy->get_cert_methods;
238         for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
239                 {
240                 lu=sk_X509_LOOKUP_value(sk,i);
241                 X509_LOOKUP_shutdown(lu);
242                 X509_LOOKUP_free(lu);
243                 }
244         sk_X509_LOOKUP_free(sk);
245         sk_X509_OBJECT_pop_free(vfy->objs, cleanup);
246
247         CRYPTO_free_ex_data(x509_store_meth,vfy,&vfy->ex_data);
248         OPENSSL_free(vfy);
249         }
250
251 X509_LOOKUP *X509_STORE_add_lookup(X509_STORE *v, X509_LOOKUP_METHOD *m)
252         {
253         int i;
254         STACK_OF(X509_LOOKUP) *sk;
255         X509_LOOKUP *lu;
256
257         sk=v->get_cert_methods;
258         for (i=0; i<sk_X509_LOOKUP_num(sk); i++)
259                 {
260                 lu=sk_X509_LOOKUP_value(sk,i);
261                 if (m == lu->method)
262                         {
263                         return lu;
264                         }
265                 }
266         /* a new one */
267         lu=X509_LOOKUP_new(m);
268         if (lu == NULL)
269                 return NULL;
270         else
271                 {
272                 lu->store_ctx=v;
273                 if (sk_X509_LOOKUP_push(v->get_cert_methods,lu))
274                         return lu;
275                 else
276                         {
277                         X509_LOOKUP_free(lu);
278                         return NULL;
279                         }
280                 }
281         }
282
283 int X509_STORE_get_by_subject(X509_STORE_CTX *vs, int type, X509_NAME *name,
284              X509_OBJECT *ret)
285         {
286         X509_STORE *ctx=vs->ctx;
287         X509_LOOKUP *lu;
288         X509_OBJECT stmp,*tmp;
289         int i,j;
290
291         tmp=X509_OBJECT_retrieve_by_subject(ctx->objs,type,name);
292
293         if (tmp == NULL)
294                 {
295                 for (i=vs->current_method; i<sk_X509_LOOKUP_num(ctx->get_cert_methods); i++)
296                         {
297                         lu=sk_X509_LOOKUP_value(ctx->get_cert_methods,i);
298                         j=X509_LOOKUP_by_subject(lu,type,name,&stmp);
299                         if (j < 0)
300                                 {
301                                 vs->current_method=j;
302                                 return j;
303                                 }
304                         else if (j)
305                                 {
306                                 tmp= &stmp;
307                                 break;
308                                 }
309                         }
310                 vs->current_method=0;
311                 if (tmp == NULL)
312                         return 0;
313                 }
314
315 /*      if (ret->data.ptr != NULL)
316                 X509_OBJECT_free_contents(ret); */
317
318         ret->type=tmp->type;
319         ret->data.ptr=tmp->data.ptr;
320
321         X509_OBJECT_up_ref_count(ret);
322
323         return 1;
324         }
325
326 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
327         {
328         X509_OBJECT *obj;
329         int ret=1;
330
331         if (x == NULL) return 0;
332         obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
333         if (obj == NULL)
334                 {
335                 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
336                 return 0;
337                 }
338         obj->type=X509_LU_X509;
339         obj->data.x509=x;
340
341         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
342
343         X509_OBJECT_up_ref_count(obj);
344
345
346         if (X509_OBJECT_retrieve_match(ctx->objs, obj))
347                 {
348                 X509_OBJECT_free_contents(obj);
349                 OPENSSL_free(obj);
350                 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
351                 ret=0;
352                 } 
353         else sk_X509_OBJECT_push(ctx->objs, obj);
354
355         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
356
357         return ret;
358         }
359
360 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
361         {
362         X509_OBJECT *obj;
363         int ret=1;
364
365         if (x == NULL) return 0;
366         obj=(X509_OBJECT *)OPENSSL_malloc(sizeof(X509_OBJECT));
367         if (obj == NULL)
368                 {
369                 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
370                 return 0;
371                 }
372         obj->type=X509_LU_CRL;
373         obj->data.crl=x;
374
375         CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
376
377         X509_OBJECT_up_ref_count(obj);
378
379         if (X509_OBJECT_retrieve_match(ctx->objs, obj))
380                 {
381                 X509_OBJECT_free_contents(obj);
382                 OPENSSL_free(obj);
383                 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
384                 ret=0;
385                 }
386         else sk_X509_OBJECT_push(ctx->objs, obj);
387
388         CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
389
390         return ret;
391         }
392
393 void X509_OBJECT_up_ref_count(X509_OBJECT *a)
394         {
395         switch (a->type)
396                 {
397         case X509_LU_X509:
398                 CRYPTO_add(&a->data.x509->references,1,CRYPTO_LOCK_X509);
399                 break;
400         case X509_LU_CRL:
401                 CRYPTO_add(&a->data.crl->references,1,CRYPTO_LOCK_X509_CRL);
402                 break;
403                 }
404         }
405
406 void X509_OBJECT_free_contents(X509_OBJECT *a)
407         {
408         switch (a->type)
409                 {
410         case X509_LU_X509:
411                 X509_free(a->data.x509);
412                 break;
413         case X509_LU_CRL:
414                 X509_CRL_free(a->data.crl);
415                 break;
416                 }
417         }
418
419 int X509_OBJECT_idx_by_subject(STACK_OF(X509_OBJECT) *h, int type,
420              X509_NAME *name)
421         {
422         X509_OBJECT stmp;
423         X509 x509_s;
424         X509_CINF cinf_s;
425         X509_CRL crl_s;
426         X509_CRL_INFO crl_info_s;
427
428         stmp.type=type;
429         switch (type)
430                 {
431         case X509_LU_X509:
432                 stmp.data.x509= &x509_s;
433                 x509_s.cert_info= &cinf_s;
434                 cinf_s.subject=name;
435                 break;
436         case X509_LU_CRL:
437                 stmp.data.crl= &crl_s;
438                 crl_s.crl= &crl_info_s;
439                 crl_info_s.issuer=name;
440                 break;
441         default:
442                 /* abort(); */
443                 return -1;
444                 }
445
446         return sk_X509_OBJECT_find(h,&stmp);
447         }
448
449 X509_OBJECT *X509_OBJECT_retrieve_by_subject(STACK_OF(X509_OBJECT) *h, int type,
450              X509_NAME *name)
451 {
452         int idx;
453         idx = X509_OBJECT_idx_by_subject(h, type, name);
454         if (idx==-1) return NULL;
455         return sk_X509_OBJECT_value(h, idx);
456 }
457
458 X509_OBJECT *X509_OBJECT_retrieve_match(STACK_OF(X509_OBJECT) *h, X509_OBJECT *x)
459 {
460         int idx, i;
461         X509_OBJECT *obj;
462         idx = sk_X509_OBJECT_find(h, x);
463         if (idx == -1) return NULL;
464         if (x->type != X509_LU_X509) return sk_X509_OBJECT_value(h, idx);
465         for (i = idx; i < sk_X509_OBJECT_num(h); i++)
466                 {
467                 obj = sk_X509_OBJECT_value(h, i);
468                 if (x509_object_cmp((const X509_OBJECT **)&obj, (const X509_OBJECT **)&x))
469                         return NULL;
470                 if ((x->type != X509_LU_X509) || !X509_cmp(obj->data.x509, x->data.x509))
471                         return obj;
472                 }
473         return NULL;
474 }
475
476
477 /* Try to get issuer certificate from store. Due to limitations
478  * of the API this can only retrieve a single certificate matching
479  * a given subject name. However it will fill the cache with all
480  * matching certificates, so we can examine the cache for all 
481  * matches.
482  *
483  * Return values are:
484  *  1 lookup successful.
485  *  0 certificate not found.
486  * -1 some other error.
487  */
488
489
490 int X509_STORE_CTX_get1_issuer(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
491 {
492         X509_NAME *xn;
493         X509_OBJECT obj, *pobj;
494         int i, ok, idx;
495         xn=X509_get_issuer_name(x);
496         ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
497         if (ok != X509_LU_X509)
498                 {
499                 if (ok == X509_LU_RETRY)
500                         {
501                         X509_OBJECT_free_contents(&obj);
502                         X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
503                         return -1;
504                         }
505                 else if (ok != X509_LU_FAIL)
506                         {
507                         X509_OBJECT_free_contents(&obj);
508                         /* not good :-(, break anyway */
509                         return -1;
510                         }
511                 return 0;
512                 }
513         /* If certificate matches all OK */
514         if (ctx->check_issued(ctx, x, obj.data.x509))
515                 {
516                 *issuer = obj.data.x509;
517                 return 1;
518                 }
519         X509_OBJECT_free_contents(&obj);
520         /* Else find index of first matching cert */
521         idx = X509_OBJECT_idx_by_subject(ctx->ctx->objs, X509_LU_X509, xn);
522         /* This shouldn't normally happen since we already have one match */
523         if (idx == -1) return 0;
524
525         /* Look through all matching certificates for a suitable issuer */
526         for (i = idx; i < sk_X509_OBJECT_num(ctx->ctx->objs); i++)
527                 {
528                 pobj = sk_X509_OBJECT_value(ctx->ctx->objs, i);
529                 /* See if we've ran out of matches */
530                 if (pobj->type != X509_LU_X509) return 0;
531                 if (X509_NAME_cmp(xn, X509_get_subject_name(pobj->data.x509))) return 0;
532                 if (ctx->check_issued(ctx, x, pobj->data.x509))
533                         {
534                         *issuer = pobj->data.x509;
535                         X509_OBJECT_up_ref_count(pobj);
536                         return 1;
537                         }
538                 }
539         return 0;
540 }
541
542 void X509_STORE_set_flags(X509_STORE *ctx, long flags)
543         {
544         ctx->flags |= flags;
545         }
546
547 IMPLEMENT_STACK_OF(X509_LOOKUP)
548 IMPLEMENT_STACK_OF(X509_OBJECT)