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diff --git a/src/lib/libcrypto/x509/x509_vfy.c b/src/lib/libcrypto/x509/x509_vfy.c
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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 "crypto.h"
66#include "cryptlib.h"
67#include "lhash.h"
68#include "buffer.h"
69#include "evp.h"
70#include "asn1.h"
71#include "x509.h"
72#include "objects.h"
73#include "pem.h"
74
75#ifndef NOPROTO
76static int null_callback(int ok,X509_STORE_CTX *e);
77static int internal_verify(X509_STORE_CTX *ctx);
78#else
79static int null_callback();
80static int internal_verify();
81#endif
82
83char *X509_version="X509 part of SSLeay 0.9.0b 29-Jun-1998";
84static STACK *x509_store_ctx_method=NULL;
85static int x509_store_ctx_num=0;
86#if 0
87static int x509_store_num=1;
88static STACK *x509_store_method=NULL;
89#endif
90
91static int null_callback(ok,e)
92int ok;
93X509_STORE_CTX *e;
94 {
95 return(ok);
96 }
97
98#if 0
99static int x509_subject_cmp(a,b)
100X509 **a,**b;
101 {
102 return(X509_subject_name_cmp(*a,*b));
103 }
104#endif
105
106int X509_verify_cert(ctx)
107X509_STORE_CTX *ctx;
108 {
109 X509 *x,*xtmp,*chain_ss=NULL;
110 X509_NAME *xn;
111 X509_OBJECT obj;
112 int depth,i,ok=0;
113 int num;
114 int (*cb)();
115 STACK *sktmp=NULL;
116
117 if (ctx->cert == NULL)
118 {
119 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
120 return(-1);
121 }
122
123 cb=ctx->ctx->verify_cb;
124 if (cb == NULL) cb=null_callback;
125
126 /* first we make sure the chain we are going to build is
127 * present and that the first entry is in place */
128 if (ctx->chain == NULL)
129 {
130 if ( ((ctx->chain=sk_new_null()) == NULL) ||
131 (!sk_push(ctx->chain,(char *)ctx->cert)))
132 {
133 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
134 goto end;
135 }
136 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
137 ctx->last_untrusted=1;
138 }
139
140 /* We use a temporary so we can chop and hack at it */
141 if ((ctx->untrusted != NULL) && (sktmp=sk_dup(ctx->untrusted)) == NULL)
142 {
143 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
144 goto end;
145 }
146
147 num=sk_num(ctx->chain);
148 x=(X509 *)sk_value(ctx->chain,num-1);
149 depth=ctx->depth;
150
151
152 for (;;)
153 {
154 /* If we have enough, we break */
155 if (depth <= num) break;
156
157 /* If we are self signed, we break */
158 xn=X509_get_issuer_name(x);
159 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
160 break;
161
162 /* If we were passed a cert chain, use it first */
163 if (ctx->untrusted != NULL)
164 {
165 xtmp=X509_find_by_subject(sktmp,xn);
166 if (xtmp != NULL)
167 {
168 if (!sk_push(ctx->chain,(char *)xtmp))
169 {
170 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
171 goto end;
172 }
173 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
174 sk_delete_ptr(sktmp,(char *)xtmp);
175 ctx->last_untrusted++;
176 x=xtmp;
177 num++;
178 /* reparse the full chain for
179 * the next one */
180 continue;
181 }
182 }
183 break;
184 }
185
186 /* at this point, chain should contain a list of untrusted
187 * certificates. We now need to add at least one trusted one,
188 * if possible, otherwise we complain. */
189
190 i=sk_num(ctx->chain);
191 x=(X509 *)sk_value(ctx->chain,i-1);
192 if (X509_NAME_cmp(X509_get_subject_name(x),X509_get_issuer_name(x))
193 == 0)
194 {
195 /* we have a self signed certificate */
196 if (sk_num(ctx->chain) == 1)
197 {
198 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
199 ctx->current_cert=x;
200 ctx->error_depth=i-1;
201 ok=cb(0,ctx);
202 if (!ok) goto end;
203 }
204 else
205 {
206 /* worry more about this one elsewhere */
207 chain_ss=(X509 *)sk_pop(ctx->chain);
208 ctx->last_untrusted--;
209 num--;
210 x=(X509 *)sk_value(ctx->chain,num-1);
211 }
212 }
213
214 /* We now lookup certs from the certificate store */
215 for (;;)
216 {
217 /* If we have enough, we break */
218 if (depth <= num) break;
219
220 /* If we are self signed, we break */
221 xn=X509_get_issuer_name(x);
222 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
223 break;
224
225 ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
226 if (ok != X509_LU_X509)
227 {
228 if (ok == X509_LU_RETRY)
229 {
230 X509_OBJECT_free_contents(&obj);
231 X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
232 return(ok);
233 }
234 else if (ok != X509_LU_FAIL)
235 {
236 X509_OBJECT_free_contents(&obj);
237 /* not good :-(, break anyway */
238 return(ok);
239 }
240 break;
241 }
242 x=obj.data.x509;
243 if (!sk_push(ctx->chain,(char *)obj.data.x509))
244 {
245 X509_OBJECT_free_contents(&obj);
246 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
247 return(0);
248 }
249 num++;
250 }
251
252 /* we now have our chain, lets check it... */
253 xn=X509_get_issuer_name(x);
254 if (X509_NAME_cmp(X509_get_subject_name(x),xn) != 0)
255 {
256 if ((chain_ss == NULL) || (X509_NAME_cmp(X509_get_subject_name(chain_ss),xn) != 0))
257 {
258 if (ctx->last_untrusted >= num)
259 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
260 else
261 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
262 ctx->current_cert=x;
263 }
264 else
265 {
266
267 sk_push(ctx->chain,(char *)chain_ss);
268 num++;
269 ctx->last_untrusted=num;
270 ctx->current_cert=chain_ss;
271 ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
272 chain_ss=NULL;
273 }
274
275 ctx->error_depth=num-1;
276 ok=cb(0,ctx);
277 if (!ok) goto end;
278 }
279
280 /* We may as well copy down any DSA parameters that are required */
281 X509_get_pubkey_parameters(NULL,ctx->chain);
282
283 /* At this point, we have a chain and just need to verify it */
284 if (ctx->ctx->verify != NULL)
285 ok=ctx->ctx->verify(ctx);
286 else
287 ok=internal_verify(ctx);
288end:
289 if (sktmp != NULL) sk_free(sktmp);
290 if (chain_ss != NULL) X509_free(chain_ss);
291 return(ok);
292 }
293
294static int internal_verify(ctx)
295X509_STORE_CTX *ctx;
296 {
297 int i,ok=0,n;
298 X509 *xs,*xi;
299 EVP_PKEY *pkey=NULL;
300 int (*cb)();
301
302 cb=ctx->ctx->verify_cb;
303 if (cb == NULL) cb=null_callback;
304
305 n=sk_num(ctx->chain);
306 ctx->error_depth=n-1;
307 n--;
308 xi=(X509 *)sk_value(ctx->chain,n);
309 if (X509_NAME_cmp(X509_get_subject_name(xi),
310 X509_get_issuer_name(xi)) == 0)
311 xs=xi;
312 else
313 {
314 if (n <= 0)
315 {
316 ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
317 ctx->current_cert=xi;
318 ok=cb(0,ctx);
319 goto end;
320 }
321 else
322 {
323 n--;
324 ctx->error_depth=n;
325 xs=(X509 *)sk_value(ctx->chain,n);
326 }
327 }
328
329/* ctx->error=0; not needed */
330 while (n >= 0)
331 {
332 ctx->error_depth=n;
333 if (!xs->valid)
334 {
335 if ((pkey=X509_get_pubkey(xi)) == NULL)
336 {
337 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
338 ctx->current_cert=xi;
339 ok=(*cb)(0,ctx);
340 if (!ok) goto end;
341 }
342 if (X509_verify(xs,pkey) <= 0)
343 {
344 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
345 ctx->current_cert=xs;
346 ok=(*cb)(0,ctx);
347 if (!ok) goto end;
348 }
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=(X509 *)sk_value(ctx->chain,n);
398 }
399 }
400 ok=1;
401end:
402 return(ok);
403 }
404
405int X509_cmp_current_time(ctm)
406ASN1_UTCTIME *ctm;
407 {
408 char *str;
409 ASN1_UTCTIME atm;
410 time_t offset;
411 char buff1[24],buff2[24],*p;
412 int i,j;
413
414 p=buff1;
415 i=ctm->length;
416 str=(char *)ctm->data;
417 if ((i < 11) || (i > 17)) return(0);
418 memcpy(p,str,10);
419 p+=10;
420 str+=10;
421
422 if ((*str == 'Z') || (*str == '-') || (*str == '+'))
423 { *(p++)='0'; *(p++)='0'; }
424 else { *(p++)= *(str++); *(p++)= *(str++); }
425 *(p++)='Z';
426 *(p++)='\0';
427
428 if (*str == 'Z')
429 offset=0;
430 else
431 {
432 if ((*str != '+') && (str[5] != '-'))
433 return(0);
434 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
435 offset+=(str[3]-'0')*10+(str[4]-'0');
436 if (*str == '-')
437 offset=-offset;
438 }
439 atm.type=V_ASN1_UTCTIME;
440 atm.length=sizeof(buff2);
441 atm.data=(unsigned char *)buff2;
442
443 X509_gmtime_adj(&atm,-offset);
444
445 i=(buff1[0]-'0')*10+(buff1[1]-'0');
446 if (i < 70) i+=100;
447 j=(buff2[0]-'0')*10+(buff2[1]-'0');
448 if (j < 70) j+=100;
449
450 if (i < j) return (-1);
451 if (i > j) return (1);
452 i=strcmp(buff1,buff2);
453 if (i == 0) /* wait a second then return younger :-) */
454 return(-1);
455 else
456 return(i);
457 }
458
459ASN1_UTCTIME *X509_gmtime_adj(s, adj)
460ASN1_UTCTIME *s;
461long adj;
462 {
463 time_t t;
464
465 time(&t);
466 t+=adj;
467 return(ASN1_UTCTIME_set(s,t));
468 }
469
470int X509_get_pubkey_parameters(pkey,chain)
471EVP_PKEY *pkey;
472STACK *chain;
473 {
474 EVP_PKEY *ktmp=NULL,*ktmp2;
475 int i,j;
476
477 if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return(1);
478
479 for (i=0; i<sk_num(chain); i++)
480 {
481 ktmp=X509_get_pubkey((X509 *)sk_value(chain,i));
482 if (ktmp == NULL)
483 {
484 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
485 return(0);
486 }
487 if (!EVP_PKEY_missing_parameters(ktmp))
488 break;
489 else
490 {
491 ktmp=NULL;
492 }
493 }
494 if (ktmp == NULL)
495 {
496 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
497 return(0);
498 }
499
500 /* first, populate the other certs */
501 for (j=i-1; j >= 0; j--)
502 {
503 ktmp2=X509_get_pubkey((X509 *)sk_value(chain,j));
504 EVP_PKEY_copy_parameters(ktmp2,ktmp);
505 }
506
507 if (pkey != NULL)
508 EVP_PKEY_copy_parameters(pkey,ktmp);
509 return(1);
510 }
511
512EVP_PKEY *X509_get_pubkey(x)
513X509 *x;
514 {
515 if ((x == NULL) || (x->cert_info == NULL))
516 return(NULL);
517 return(X509_PUBKEY_get(x->cert_info->key));
518 }
519
520int X509_check_private_key(x,k)
521X509 *x;
522EVP_PKEY *k;
523 {
524 EVP_PKEY *xk=NULL;
525 int ok=0;
526
527 xk=X509_get_pubkey(x);
528 if (xk->type != k->type) goto err;
529 switch (k->type)
530 {
531#ifndef NO_RSA
532 case EVP_PKEY_RSA:
533 if (BN_cmp(xk->pkey.rsa->n,k->pkey.rsa->n) != 0) goto err;
534 if (BN_cmp(xk->pkey.rsa->e,k->pkey.rsa->e) != 0) goto err;
535 break;
536#endif
537#ifndef NO_DSA
538 case EVP_PKEY_DSA:
539 if (BN_cmp(xk->pkey.dsa->pub_key,k->pkey.dsa->pub_key) != 0)
540 goto err;
541 break;
542#endif
543#ifndef NO_DH
544 case EVP_PKEY_DH:
545 /* No idea */
546 goto err;
547#endif
548 default:
549 goto err;
550 }
551
552 ok=1;
553err:
554 return(ok);
555 }
556
557int X509_STORE_add_cert(ctx,x)
558X509_STORE *ctx;
559X509 *x;
560 {
561 X509_OBJECT *obj,*r;
562 int ret=1;
563
564 if (x == NULL) return(0);
565 obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
566 if (obj == NULL)
567 {
568 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
569 return(0);
570 }
571 obj->type=X509_LU_X509;
572 obj->data.x509=x;
573
574 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
575
576 X509_OBJECT_up_ref_count(obj);
577
578 r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
579 if (r != NULL)
580 { /* oops, put it back */
581 lh_delete(ctx->certs,(char *)obj);
582 X509_OBJECT_free_contents(obj);
583 Free(obj);
584 lh_insert(ctx->certs,(char *)r);
585 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
586 ret=0;
587 }
588
589 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
590
591 return(ret);
592 }
593
594int X509_STORE_add_crl(ctx,x)
595X509_STORE *ctx;
596X509_CRL *x;
597 {
598 X509_OBJECT *obj,*r;
599 int ret=1;
600
601 if (x == NULL) return(0);
602 obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
603 if (obj == NULL)
604 {
605 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
606 return(0);
607 }
608 obj->type=X509_LU_CRL;
609 obj->data.crl=x;
610
611 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
612
613 X509_OBJECT_up_ref_count(obj);
614
615 r=(X509_OBJECT *)lh_insert(ctx->certs,(char *)obj);
616 if (r != NULL)
617 { /* oops, put it back */
618 lh_delete(ctx->certs,(char *)obj);
619 X509_OBJECT_free_contents(obj);
620 Free(obj);
621 lh_insert(ctx->certs,(char *)r);
622 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
623 ret=0;
624 }
625
626 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
627
628 return(ret);
629 }
630
631int X509_STORE_CTX_get_ex_new_index(argl,argp,new_func,dup_func,free_func)
632long argl;
633char *argp;
634int (*new_func)();
635int (*dup_func)();
636void (*free_func)();
637 {
638 x509_store_ctx_num++;
639 return(CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
640 &x509_store_ctx_method,
641 argl,argp,new_func,dup_func,free_func));
642 }
643
644int X509_STORE_CTX_set_ex_data(ctx,idx,data)
645X509_STORE_CTX *ctx;
646int idx;
647char *data;
648 {
649 return(CRYPTO_set_ex_data(&ctx->ex_data,idx,data));
650 }
651
652char *X509_STORE_CTX_get_ex_data(ctx,idx)
653X509_STORE_CTX *ctx;
654int idx;
655 {
656 return(CRYPTO_get_ex_data(&ctx->ex_data,idx));
657 }
658
659int X509_STORE_CTX_get_error(ctx)
660X509_STORE_CTX *ctx;
661 {
662 return(ctx->error);
663 }
664
665void X509_STORE_CTX_set_error(ctx,err)
666X509_STORE_CTX *ctx;
667int err;
668 {
669 ctx->error=err;
670 }
671
672int X509_STORE_CTX_get_error_depth(ctx)
673X509_STORE_CTX *ctx;
674 {
675 return(ctx->error_depth);
676 }
677
678X509 *X509_STORE_CTX_get_current_cert(ctx)
679X509_STORE_CTX *ctx;
680 {
681 return(ctx->current_cert);
682 }
683
684STACK *X509_STORE_CTX_get_chain(ctx)
685X509_STORE_CTX *ctx;
686 {
687 return(ctx->chain);
688 }
689
690void X509_STORE_CTX_set_cert(ctx,x)
691X509_STORE_CTX *ctx;
692X509 *x;
693 {
694 ctx->cert=x;
695 }
696
697void X509_STORE_CTX_set_chain(ctx,sk)
698X509_STORE_CTX *ctx;
699STACK *sk;
700 {
701 ctx->untrusted=sk;
702 }
703
704
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