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_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
75 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
76 static int check_chain_purpose(X509_STORE_CTX *ctx);
77 static int check_trust(X509_STORE_CTX *ctx);
78 static int internal_verify(X509_STORE_CTX *ctx);
79 const char *X509_version="X.509" OPENSSL_VERSION_PTEXT;
81 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *x509_store_ctx_method=NULL;
82 static int x509_store_ctx_num=0;
84 static int x509_store_num=1;
85 static STACK *x509_store_method=NULL;
88 static int null_callback(int ok, X509_STORE_CTX *e)
94 static int x509_subject_cmp(X509 **a, X509 **b)
96 return X509_subject_name_cmp(*a,*b);
100 int X509_verify_cert(X509_STORE_CTX *ctx)
102 X509 *x,*xtmp,*chain_ss=NULL;
107 STACK_OF(X509) *sktmp=NULL;
109 if (ctx->cert == NULL)
111 X509err(X509_F_X509_VERIFY_CERT,X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
116 if (cb == NULL) cb=null_callback;
118 /* first we make sure the chain we are going to build is
119 * present and that the first entry is in place */
120 if (ctx->chain == NULL)
122 if ( ((ctx->chain=sk_X509_new_null()) == NULL) ||
123 (!sk_X509_push(ctx->chain,ctx->cert)))
125 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
128 CRYPTO_add(&ctx->cert->references,1,CRYPTO_LOCK_X509);
129 ctx->last_untrusted=1;
132 /* We use a temporary STACK so we can chop and hack at it */
133 if (ctx->untrusted != NULL
134 && (sktmp=sk_X509_dup(ctx->untrusted)) == NULL)
136 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
140 num=sk_X509_num(ctx->chain);
141 x=sk_X509_value(ctx->chain,num-1);
147 /* If we have enough, we break */
148 if (depth < num) break; /* FIXME: If this happens, we should take
149 * note of it and, if appropriate, use the
150 * X509_V_ERR_CERT_CHAIN_TOO_LONG error
154 /* If we are self signed, we break */
155 xn=X509_get_issuer_name(x);
156 if (ctx->check_issued(ctx, x,x)) break;
158 /* If we were passed a cert chain, use it first */
159 if (ctx->untrusted != NULL)
161 xtmp=find_issuer(ctx, sktmp,x);
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 /* Examine last certificate in chain and see if it
190 i=sk_X509_num(ctx->chain);
191 x=sk_X509_value(ctx->chain,i-1);
192 xn = X509_get_subject_name(x);
193 if (ctx->check_issued(ctx, x, x))
195 /* we have a self signed certificate */
196 if (sk_X509_num(ctx->chain) == 1)
198 /* We have a single self signed certificate: see if
199 * we can find it in the store. We must have an exact
200 * match to avoid possible impersonation.
202 ok = ctx->get_issuer(&xtmp, ctx, x);
203 if ((ok <= 0) || X509_cmp(x, xtmp))
205 ctx->error=X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
207 ctx->error_depth=i-1;
208 if (ok == 1) X509_free(xtmp);
214 /* We have a match: replace certificate with store version
215 * so we get any trust settings.
219 sk_X509_set(ctx->chain, i - 1, x);
220 ctx->last_untrusted=0;
225 /* extract and save self signed certificate for later use */
226 chain_ss=sk_X509_pop(ctx->chain);
227 ctx->last_untrusted--;
229 x=sk_X509_value(ctx->chain,num-1);
233 /* We now lookup certs from the certificate store */
236 /* If we have enough, we break */
237 if (depth < num) break;
239 /* If we are self signed, we break */
240 xn=X509_get_issuer_name(x);
241 if (ctx->check_issued(ctx,x,x)) break;
243 ok = ctx->get_issuer(&xtmp, ctx, x);
245 if (ok < 0) return ok;
249 if (!sk_X509_push(ctx->chain,x))
252 X509err(X509_F_X509_VERIFY_CERT,ERR_R_MALLOC_FAILURE);
258 /* we now have our chain, lets check it... */
259 xn=X509_get_issuer_name(x);
261 /* Is last certificate looked up self signed? */
262 if (!ctx->check_issued(ctx,x,x))
264 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss))
266 if (ctx->last_untrusted >= num)
267 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
269 ctx->error=X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
275 sk_X509_push(ctx->chain,chain_ss);
277 ctx->last_untrusted=num;
278 ctx->current_cert=chain_ss;
279 ctx->error=X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
283 ctx->error_depth=num-1;
288 /* We have the chain complete: now we need to check its purpose */
289 if (ctx->purpose > 0) ok = check_chain_purpose(ctx);
293 /* The chain extensions are OK: check trust */
295 if (ctx->trust > 0) ok = check_trust(ctx);
299 /* We may as well copy down any DSA parameters that are required */
300 X509_get_pubkey_parameters(NULL,ctx->chain);
302 /* At this point, we have a chain and just need to verify it */
303 if (ctx->verify != NULL)
306 ok=internal_verify(ctx);
310 X509_get_pubkey_parameters(NULL,ctx->chain);
312 if (sktmp != NULL) sk_X509_free(sktmp);
313 if (chain_ss != NULL) X509_free(chain_ss);
318 /* Given a STACK_OF(X509) find the issuer of cert (if any)
321 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
325 for (i = 0; i < sk_X509_num(sk); i++)
327 issuer = sk_X509_value(sk, i);
328 if (ctx->check_issued(ctx, x, issuer))
334 /* Given a possible certificate and issuer check them */
336 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
339 ret = X509_check_issued(issuer, x);
340 if (ret == X509_V_OK)
345 ctx->current_cert = x;
346 ctx->current_issuer = issuer;
347 if ((ctx->flags & X509_V_FLAG_CB_ISSUER_CHECK) && ctx->verify_cb)
348 return ctx->verify_cb(0, ctx);
355 /* Alternative lookup method: look from a STACK stored in other_ctx */
357 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
359 *issuer = find_issuer(ctx, ctx->other_ctx, x);
362 CRYPTO_add(&(*issuer)->references,1,CRYPTO_LOCK_X509);
370 /* Check a certificate chains extensions for consistency
371 * with the supplied purpose
374 static int check_chain_purpose(X509_STORE_CTX *ctx)
376 #ifdef NO_CHAIN_VERIFY
383 if (cb == NULL) cb=null_callback;
384 /* Check all untrusted certificates */
385 for (i = 0; i < ctx->last_untrusted; i++)
387 x = sk_X509_value(ctx->chain, i);
388 if (!X509_check_purpose(x, ctx->purpose, i))
391 ctx->error = X509_V_ERR_INVALID_CA;
393 ctx->error = X509_V_ERR_INVALID_PURPOSE;
394 ctx->error_depth = i;
395 ctx->current_cert = x;
400 if ((i > 1) && (x->ex_pathlen != -1)
401 && (i > (x->ex_pathlen + 1)))
403 ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
404 ctx->error_depth = i;
405 ctx->current_cert = x;
416 static int check_trust(X509_STORE_CTX *ctx)
418 #ifdef NO_CHAIN_VERIFY
425 if (cb == NULL) cb=null_callback;
426 /* For now just check the last certificate in the chain */
427 i = sk_X509_num(ctx->chain) - 1;
428 x = sk_X509_value(ctx->chain, i);
429 ok = X509_check_trust(x, ctx->trust, 0);
430 if (ok == X509_TRUST_TRUSTED)
432 ctx->error_depth = sk_X509_num(ctx->chain) - 1;
433 ctx->current_cert = x;
434 if (ok == X509_TRUST_REJECTED)
435 ctx->error = X509_V_ERR_CERT_REJECTED;
437 ctx->error = X509_V_ERR_CERT_UNTRUSTED;
443 static int internal_verify(X509_STORE_CTX *ctx)
452 if (cb == NULL) cb=null_callback;
454 n=sk_X509_num(ctx->chain);
455 ctx->error_depth=n-1;
457 xi=sk_X509_value(ctx->chain,n);
458 if (ctx->flags & X509_V_FLAG_USE_CHECK_TIME)
459 ptime = &ctx->check_time;
462 if (ctx->check_issued(ctx, xi, xi))
468 ctx->error=X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
469 ctx->current_cert=xi;
477 xs=sk_X509_value(ctx->chain,n);
481 /* ctx->error=0; not needed */
487 if ((pkey=X509_get_pubkey(xi)) == NULL)
489 ctx->error=X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
490 ctx->current_cert=xi;
494 if (X509_verify(xs,pkey) <= 0)
496 ctx->error=X509_V_ERR_CERT_SIGNATURE_FAILURE;
497 ctx->current_cert=xs;
508 i=X509_cmp_time(X509_get_notBefore(xs), ptime);
511 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
512 ctx->current_cert=xs;
518 ctx->error=X509_V_ERR_CERT_NOT_YET_VALID;
519 ctx->current_cert=xs;
526 i=X509_cmp_time(X509_get_notAfter(xs), ptime);
529 ctx->error=X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
530 ctx->current_cert=xs;
537 ctx->error=X509_V_ERR_CERT_HAS_EXPIRED;
538 ctx->current_cert=xs;
545 /* The last error (if any) is still in the error value */
546 ctx->current_cert=xs;
554 xs=sk_X509_value(ctx->chain,n);
562 int X509_cmp_current_time(ASN1_TIME *ctm)
564 return X509_cmp_time(ctm, NULL);
567 int X509_cmp_time(ASN1_TIME *ctm, time_t *cmp_time)
572 char buff1[24],buff2[24],*p;
577 str=(char *)ctm->data;
578 if (ctm->type == V_ASN1_UTCTIME)
580 if ((i < 11) || (i > 17)) return 0;
587 if (i < 13) return 0;
593 if ((*str == 'Z') || (*str == '-') || (*str == '+'))
594 { *(p++)='0'; *(p++)='0'; }
599 /* Skip any fractional seconds... */
603 while ((*str >= '0') && (*str <= '9')) str++;
614 if ((*str != '+') && (str[5] != '-'))
616 offset=((str[1]-'0')*10+(str[2]-'0'))*60;
617 offset+=(str[3]-'0')*10+(str[4]-'0');
622 atm.length=sizeof(buff2);
623 atm.data=(unsigned char *)buff2;
625 X509_time_adj(&atm,-offset*60, cmp_time);
627 if (ctm->type == V_ASN1_UTCTIME)
629 i=(buff1[0]-'0')*10+(buff1[1]-'0');
630 if (i < 50) i+=100; /* cf. RFC 2459 */
631 j=(buff2[0]-'0')*10+(buff2[1]-'0');
634 if (i < j) return -1;
637 i=strcmp(buff1,buff2);
638 if (i == 0) /* wait a second then return younger :-) */
644 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
646 return X509_time_adj(s, adj, NULL);
649 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long adj, time_t *in_tm)
653 if (in_tm) t = *in_tm;
657 if (!s) return ASN1_TIME_set(s, t);
658 if (s->type == V_ASN1_UTCTIME) return ASN1_UTCTIME_set(s,t);
659 return ASN1_GENERALIZEDTIME_set(s, t);
662 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
664 EVP_PKEY *ktmp=NULL,*ktmp2;
667 if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey)) return 1;
669 for (i=0; i<sk_X509_num(chain); i++)
671 ktmp=X509_get_pubkey(sk_X509_value(chain,i));
674 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
677 if (!EVP_PKEY_missing_parameters(ktmp))
687 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
691 /* first, populate the other certs */
692 for (j=i-1; j >= 0; j--)
694 ktmp2=X509_get_pubkey(sk_X509_value(chain,j));
695 EVP_PKEY_copy_parameters(ktmp2,ktmp);
696 EVP_PKEY_free(ktmp2);
699 if (pkey != NULL) EVP_PKEY_copy_parameters(pkey,ktmp);
704 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
705 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
707 x509_store_ctx_num++;
708 return CRYPTO_get_ex_new_index(x509_store_ctx_num-1,
709 &x509_store_ctx_method,
710 argl,argp,new_func,dup_func,free_func);
713 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
715 return CRYPTO_set_ex_data(&ctx->ex_data,idx,data);
718 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
720 return CRYPTO_get_ex_data(&ctx->ex_data,idx);
723 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
728 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
733 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
735 return ctx->error_depth;
738 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
740 return ctx->current_cert;
743 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
748 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
752 STACK_OF(X509) *chain;
753 if (!ctx->chain || !(chain = sk_X509_dup(ctx->chain))) return NULL;
754 for (i = 0; i < sk_X509_num(chain); i++)
756 x = sk_X509_value(chain, i);
757 CRYPTO_add(&x->references, 1, CRYPTO_LOCK_X509);
762 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
767 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
772 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
774 return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
777 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
779 return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
782 /* This function is used to set the X509_STORE_CTX purpose and trust
783 * values. This is intended to be used when another structure has its
784 * own trust and purpose values which (if set) will be inherited by
785 * the ctx. If they aren't set then we will usually have a default
786 * purpose in mind which should then be used to set the trust value.
787 * An example of this is SSL use: an SSL structure will have its own
788 * purpose and trust settings which the application can set: if they
789 * aren't set then we use the default of SSL client/server.
792 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
793 int purpose, int trust)
796 /* If purpose not set use default */
797 if (!purpose) purpose = def_purpose;
798 /* If we have a purpose then check it is valid */
802 idx = X509_PURPOSE_get_by_id(purpose);
805 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
806 X509_R_UNKNOWN_PURPOSE_ID);
809 ptmp = X509_PURPOSE_get0(idx);
810 if (ptmp->trust == X509_TRUST_DEFAULT)
812 idx = X509_PURPOSE_get_by_id(def_purpose);
815 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
816 X509_R_UNKNOWN_PURPOSE_ID);
819 ptmp = X509_PURPOSE_get0(idx);
821 /* If trust not set then get from purpose default */
822 if (!trust) trust = ptmp->trust;
826 idx = X509_TRUST_get_by_id(trust);
829 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
830 X509_R_UNKNOWN_TRUST_ID);
835 if (purpose) ctx->purpose = purpose;
836 if (trust) ctx->trust = trust;
840 X509_STORE_CTX *X509_STORE_CTX_new(void)
843 ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
844 if (ctx) memset(ctx, 0, sizeof(X509_STORE_CTX));
848 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
850 X509_STORE_CTX_cleanup(ctx);
854 void X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
855 STACK_OF(X509) *chain)
858 ctx->current_method=0;
860 ctx->untrusted=chain;
861 ctx->last_untrusted=0;
872 ctx->current_cert=NULL;
873 ctx->current_issuer=NULL;
874 ctx->check_issued = check_issued;
875 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
876 ctx->verify_cb = store->verify_cb;
877 ctx->verify = store->verify;
879 memset(&(ctx->ex_data),0,sizeof(CRYPTO_EX_DATA));
882 /* Set alternative lookup method: just a STACK of trusted certificates.
883 * This avoids X509_STORE nastiness where it isn't needed.
886 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
889 ctx->get_issuer = get_issuer_sk;
892 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
894 if (ctx->cleanup) ctx->cleanup(ctx);
895 if (ctx->chain != NULL)
897 sk_X509_pop_free(ctx->chain,X509_free);
900 CRYPTO_free_ex_data(x509_store_ctx_method,ctx,&(ctx->ex_data));
901 memset(&ctx->ex_data,0,sizeof(CRYPTO_EX_DATA));
904 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, long flags)
909 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, long flags, time_t t)
912 ctx->flags |= X509_V_FLAG_USE_CHECK_TIME;
915 IMPLEMENT_STACK_OF(X509)
916 IMPLEMENT_ASN1_SET_OF(X509)
918 IMPLEMENT_STACK_OF(X509_NAME)
920 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
921 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)