1 /* crypto/x509/x509_vfy.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
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>
73 static int null_callback(int ok,X509_STORE_CTX *e);
74 static int check_chain_purpose(X509_STORE_CTX *ctx);
75 static int check_trust(X509_STORE_CTX *ctx);
76 static int internal_verify(X509_STORE_CTX *ctx);
77 const char *X509_version="X.509" OPENSSL_VERSION_PTEXT;
79 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *x509_store_ctx_method=NULL;
80 static int x509_store_ctx_num=0;
82 static int x509_store_num=1;
83 static STACK *x509_store_method=NULL;
86 static int null_callback(int ok, X509_STORE_CTX *e)
92 static int x509_subject_cmp(X509 **a, X509 **b)
94 return(X509_subject_name_cmp(*a,*b));
98 int X509_verify_cert(X509_STORE_CTX *ctx)
100 X509 *x,*xtmp,*chain_ss=NULL;
106 STACK_OF(X509) *sktmp=NULL;
108 if (ctx->cert == NULL)
110 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
114 cb=ctx->ctx->verify_cb;
115 if (cb == NULL) cb=null_callback;
117 /* first we make sure the chain we are going to build is
118 * present and that the first entry is in place */
119 if (ctx->chain == NULL)
121 if ( ((ctx->chain=sk_X509_new_null()) == NULL) ||
122 (!sk_X509_push(ctx->chain,ctx->cert)))
124 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
127 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
128 ctx->last_untrusted=1;
131 /* We use a temporary STACK so we can chop and hack at it */
132 if (ctx->untrusted != NULL
133 && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
135 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
139 num=sk_X509_num(ctx->chain);
140 x=sk_X509_value(ctx->chain,num-1);
146 /* If we have enough, we break */
147 if (depth < num) break; /* FIXME: If this happens, we should take
148 * note of it and, if appropriate, use the
149 * X509_V_ERR_CERT_CHAIN_TOO_LONG error
153 /* If we are self signed, we break */
154 xn=X509_get_issuer_name(x);
155 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
158 /* If we were passed a cert chain, use it first */
159 if (ctx->untrusted != NULL)
161 xtmp=X509_find_by_subject(sktmp,xn);
164 if (!sk_X509_push(ctx->chain,xtmp))
166 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
169 CRYPTO_add(&xtmp->references,1,CRYPTO_LOCK_X509);
170 sk_X509_delete_ptr(sktmp,xtmp);
171 ctx->last_untrusted++;
174 /* reparse the full chain for
182 /* at this point, chain should contain a list of untrusted
183 * certificates. We now need to add at least one trusted one,
184 * if possible, otherwise we complain. */
186 i=sk_X509_num(ctx->chain);
187 x=sk_X509_value(ctx->chain,i-1);
188 xn = X509_get_subject_name(x);
189 if (X509_NAME_cmp(xn,X509_get_issuer_name(x))
192 /* we have a self signed certificate */
193 if (sk_X509_num(ctx->chain) == 1)
195 /* We have a single self signed certificate: see if
196 * we can find it in the store. We must have an exact
197 * match to avoid possible impersonation.
199 ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
200 if ((ok != X509_LU_X509) || X509_cmp(x, obj.data.x509))
202 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
204 ctx->error_depth=i-1;
205 if(ok == X509_LU_X509) X509_OBJECT_free_contents(&obj);
211 /* We have a match: replace certificate with store version
212 * so we get any trust settings.
216 sk_X509_set(ctx->chain, i - 1, x);
217 ctx->last_untrusted=0;
222 /* worry more about this one elsewhere */
223 chain_ss=sk_X509_pop(ctx->chain);
224 ctx->last_untrusted--;
226 x=sk_X509_value(ctx->chain,num-1);
230 /* We now lookup certs from the certificate store */
233 /* If we have enough, we break */
234 if (depth < num) break;
236 /* If we are self signed, we break */
237 xn=X509_get_issuer_name(x);
238 if (X509_NAME_cmp(X509_get_subject_name(x),xn) == 0)
241 ok=X509_STORE_get_by_subject(ctx,X509_LU_X509,xn,&obj);
242 if (ok != X509_LU_X509)
244 if (ok == X509_LU_RETRY)
246 X509_OBJECT_free_contents(&obj);
247 X509err(X509_F_X509_VERIFY_CERT,X509_R_SHOULD_RETRY);
250 else if (ok != X509_LU_FAIL)
252 X509_OBJECT_free_contents(&obj);
253 /* not good :-(, break anyway */
259 if (!sk_X509_push(ctx->chain,obj.data.x509))
261 X509_OBJECT_free_contents(&obj);
262 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
268 /* we now have our chain, lets check it... */
269 xn=X509_get_issuer_name(x);
270 if (X509_NAME_cmp(X509_get_subject_name(x),xn) != 0)
272 if ((chain_ss == NULL) || (X509_NAME_cmp(X509_get_subject_name(chain_ss),xn) != 0))
274 if (ctx->last_untrusted >= num)
275 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
277 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
283 sk_X509_push(ctx->chain,chain_ss);
285 ctx->last_untrusted=num;
286 ctx->current_cert=chain_ss;
287 ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
291 ctx->error_depth=num-1;
296 /* We have the chain complete: now we need to check its purpose */
297 if(ctx->purpose > 0) ok = check_chain_purpose(ctx);
301 /* The chain extensions are OK: check trust */
303 if(ctx->trust > 0) ok = check_trust(ctx);
307 /* We may as well copy down any DSA parameters that are required */
308 X509_get_pubkey_parameters(NULL,ctx->chain);
310 /* At this point, we have a chain and just need to verify it */
311 if (ctx->ctx->verify != NULL)
312 ok=ctx->ctx->verify(ctx);
314 ok=internal_verify(ctx);
318 X509_get_pubkey_parameters(NULL,ctx->chain);
320 if (sktmp != NULL) sk_X509_free(sktmp);
321 if (chain_ss != NULL) X509_free(chain_ss);
325 /* Check a certificate chains extensions for consistency
326 * with the supplied purpose
329 static int check_chain_purpose(X509_STORE_CTX *ctx)
331 #ifdef NO_CHAIN_VERIFY
337 cb=ctx->ctx->verify_cb;
338 if (cb == NULL) cb=null_callback;
339 /* Check all untrusted certificates */
340 for(i = 0; i < ctx->last_untrusted; i++) {
341 x = sk_X509_value(ctx->chain, i);
342 if(!X509_check_purpose(x, ctx->purpose, i)) {
343 if(i) ctx->error = X509_V_ERR_INVALID_CA;
344 else ctx->error = X509_V_ERR_INVALID_PURPOSE;
345 ctx->error_depth = i;
346 ctx->current_cert = x;
351 if((i > 1) && (x->ex_pathlen != -1)
352 && (i > (x->ex_pathlen + 1))) {
353 ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
354 ctx->error_depth = i;
355 ctx->current_cert = x;
366 static int check_trust(X509_STORE_CTX *ctx)
368 #ifdef NO_CHAIN_VERIFY
374 cb=ctx->ctx->verify_cb;
375 if (cb == NULL) cb=null_callback;
376 /* For now just check the last certificate in the chain */
377 i = sk_X509_num(ctx->chain) - 1;
378 x = sk_X509_value(ctx->chain, i);
379 ok = X509_check_trust(x, ctx->trust, 0);
380 if(ok == X509_TRUST_TRUSTED) return 1;
381 ctx->error_depth = sk_X509_num(ctx->chain) - 1;
382 ctx->current_cert = x;
383 if(ok == X509_TRUST_REJECTED) ctx->error = X509_V_ERR_CERT_REJECTED;
384 else ctx->error = X509_V_ERR_CERT_UNTRUSTED;
390 static int internal_verify(X509_STORE_CTX *ctx)
397 cb=ctx->ctx->verify_cb;
398 if (cb == NULL) cb=null_callback;
400 n=sk_X509_num(ctx->chain);
401 ctx->error_depth=n-1;
403 xi=sk_X509_value(ctx->chain,n);
404 if (X509_NAME_cmp(X509_get_subject_name(xi),
405 X509_get_issuer_name(xi)) == 0)
411 ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
412 ctx->current_cert=xi;
420 xs=sk_X509_value(ctx->chain,n);
424 /* ctx->error=0; not needed */
430 if ((pkey=X509_get_pubkey(xi)) == NULL)
432 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
433 ctx->current_cert=xi;
437 if (X509_verify(xs,pkey) <= 0)
439 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
440 ctx->current_cert=xs;
451 i=X509_cmp_current_time(X509_get_notBefore(xs));
454 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
455 ctx->current_cert=xs;
461 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
462 ctx->current_cert=xs;
469 i=X509_cmp_current_time(X509_get_notAfter(xs));
472 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
473 ctx->current_cert=xs;
480 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
481 ctx->current_cert=xs;
488 /* The last error (if any) is still in the error value */
489 ctx->current_cert=xs;
497 xs=sk_X509_value(ctx->chain,n);
505 int X509_cmp_current_time(ASN1_UTCTIME *ctm)
510 char buff1[24],buff2[24],*p;
515 str=(char *)ctm->data;
516 if ((i < 11) || (i > 17)) return(0);
521 if ((*str == 'Z') || (*str == '-') || (*str == '+'))
522 { *(p++)='0'; *(p++)='0'; }
523 else { *(p++)= *(str++); *(p++)= *(str++); }
531 if ((*str != '+') && (str[5] != '-'))
533 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
534 offset+=(str[3]-'0')*10+(str[4]-'0');
538 atm.type=V_ASN1_UTCTIME;
539 atm.length=sizeof(buff2);
540 atm.data=(unsigned char *)buff2;
542 X509_gmtime_adj(&atm,-offset*60);
544 i=(buff1[0]-'0')*10+(buff1[1]-'0');
545 if (i < 50) i+=100; /* cf. RFC 2459 */
546 j=(buff2[0]-'0')*10+(buff2[1]-'0');
549 if (i < j) return (-1);
550 if (i > j) return (1);
551 i=strcmp(buff1,buff2);
552 if (i == 0) /* wait a second then return younger :-) */
558 ASN1_UTCTIME *X509_gmtime_adj(ASN1_UTCTIME *s, long adj)
564 return(ASN1_UTCTIME_set(s,t));
567 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
569 EVP_PKEY *ktmp=NULL,*ktmp2;
572 if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return(1);
574 for (i=0; i<sk_X509_num(chain); i++)
576 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
579 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
582 if (!EVP_PKEY_missing_parameters(ktmp))
592 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
596 /* first, populate the other certs */
597 for (j=i-1; j >= 0; j--)
599 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
600 EVP_PKEY_copy_parameters(ktmp2,ktmp);
601 EVP_PKEY_free(ktmp2);
604 if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
609 int X509_STORE_add_cert(X509_STORE *ctx, X509 *x)
614 if (x == NULL) return(0);
615 obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
618 X509err(X509_F_X509_STORE_ADD_CERT,ERR_R_MALLOC_FAILURE);
621 obj->type=X509_LU_X509;
624 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
626 X509_OBJECT_up_ref_count(obj);
628 r=(X509_OBJECT *)lh_insert(ctx->certs,obj);
630 { /* oops, put it back */
631 lh_delete(ctx->certs,obj);
632 X509_OBJECT_free_contents(obj);
634 lh_insert(ctx->certs,r);
635 X509err(X509_F_X509_STORE_ADD_CERT,X509_R_CERT_ALREADY_IN_HASH_TABLE);
639 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
644 int X509_STORE_add_crl(X509_STORE *ctx, X509_CRL *x)
649 if (x == NULL) return(0);
650 obj=(X509_OBJECT *)Malloc(sizeof(X509_OBJECT));
653 X509err(X509_F_X509_STORE_ADD_CRL,ERR_R_MALLOC_FAILURE);
656 obj->type=X509_LU_CRL;
659 CRYPTO_w_lock(CRYPTO_LOCK_X509_STORE);
661 X509_OBJECT_up_ref_count(obj);
663 r=(X509_OBJECT *)lh_insert(ctx->certs,obj);
665 { /* oops, put it back */
666 lh_delete(ctx->certs,obj);
667 X509_OBJECT_free_contents(obj);
669 lh_insert(ctx->certs,r);
670 X509err(X509_F_X509_STORE_ADD_CRL,X509_R_CERT_ALREADY_IN_HASH_TABLE);
674 CRYPTO_w_unlock(CRYPTO_LOCK_X509_STORE);
679 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
680 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
682 x509_store_ctx_num++;
683 return(CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
684 &x509_store_ctx_method,
685 argl,argp,new_func,dup_func,free_func));
688 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
690 return(CRYPTO_set_ex_data(&ctx->ex_data,idx,data));
693 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
695 return(CRYPTO_get_ex_data(&ctx->ex_data,idx));
698 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
703 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
708 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
710 return(ctx->error_depth);
713 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
715 return(ctx->current_cert);
718 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
723 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
727 STACK_OF(X509) *chain;
728 if(!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
729 for(i = 0; i < sk_X509_num(chain); i++) {
730 x = sk_X509_value(chain, i);
731 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
736 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
741 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
746 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
748 return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
751 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
753 return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
756 /* This function is used to set the X509_STORE_CTX purpose and trust
757 * values. This is intended to be used when another structure has its
758 * own trust and purpose values which (if set) will be inherited by
759 * the ctx. If they aren't set then we will usually have a default
760 * purpose in mind which should then be used to set the trust value.
761 * An example of this is SSL use: an SSL structure will have its own
762 * purpose and trust settings which the application can set: if they
763 * aren't set then we use the default of SSL client/server.
766 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
767 int purpose, int trust)
770 /* If purpose not set use default */
771 if(!purpose) purpose = def_purpose;
772 /* If we have a purpose then check it is valid */
775 idx = X509_PURPOSE_get_by_id(purpose);
777 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
778 X509_R_UNKNOWN_PURPOSE_ID);
781 ptmp = X509_PURPOSE_get0(idx);
782 if(ptmp->trust == X509_TRUST_DEFAULT) {
783 idx = X509_PURPOSE_get_by_id(def_purpose);
785 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
786 X509_R_UNKNOWN_PURPOSE_ID);
789 ptmp = X509_PURPOSE_get0(idx);
791 /* If trust not set then get from purpose default */
792 if(!trust) trust = ptmp->trust;
795 idx = X509_TRUST_get_by_id(trust);
797 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
798 X509_R_UNKNOWN_TRUST_ID);
803 if(purpose) ctx->purpose = purpose;
804 if(trust) ctx->trust = trust;
809 IMPLEMENT_STACK_OF(X509)
810 IMPLEMENT_ASN1_SET_OF(X509)
812 IMPLEMENT_STACK_OF(X509_NAME)
814 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
815 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)