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>
74 /* CRL score values */
76 /* No unhandled critical extensions */
78 #define CRL_SCORE_NOCRITICAL 0x100
80 /* certificate is within CRL scope */
82 #define CRL_SCORE_SCOPE 0x080
86 #define CRL_SCORE_TIME 0x040
88 /* Issuer name matches certificate */
90 #define CRL_SCORE_ISSUER_NAME 0x020
92 /* If this score or above CRL is probably valid */
94 #define CRL_SCORE_VALID (CRL_SCORE_NOCRITICAL|CRL_SCORE_TIME|CRL_SCORE_SCOPE)
96 /* CRL issuer is certificate issuer */
98 #define CRL_SCORE_ISSUER_CERT 0x018
100 /* CRL issuer is on certificate path */
102 #define CRL_SCORE_SAME_PATH 0x008
104 /* CRL issuer matches CRL AKID */
106 #define CRL_SCORE_AKID 0x004
108 /* Have a delta CRL with valid times */
110 #define CRL_SCORE_TIME_DELTA 0x002
112 static int null_callback(int ok, X509_STORE_CTX *e);
113 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer);
114 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x);
115 static int check_chain_extensions(X509_STORE_CTX *ctx);
116 static int check_name_constraints(X509_STORE_CTX *ctx);
117 static int check_id(X509_STORE_CTX *ctx);
118 static int check_trust(X509_STORE_CTX *ctx);
119 static int check_revocation(X509_STORE_CTX *ctx);
120 static int check_cert(X509_STORE_CTX *ctx);
121 static int check_policy(X509_STORE_CTX *ctx);
123 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
124 unsigned int *preasons, X509_CRL *crl, X509 *x);
125 static int get_crl_delta(X509_STORE_CTX *ctx,
126 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x);
127 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl,
128 int *pcrl_score, X509_CRL *base,
129 STACK_OF(X509_CRL) *crls);
130 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl, X509 **pissuer,
132 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
133 unsigned int *preasons);
134 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x);
135 static int check_crl_chain(X509_STORE_CTX *ctx,
136 STACK_OF(X509) *cert_path,
137 STACK_OF(X509) *crl_path);
139 static int internal_verify(X509_STORE_CTX *ctx);
140 const char X509_version[] = "X.509" OPENSSL_VERSION_PTEXT;
142 static int null_callback(int ok, X509_STORE_CTX *e)
148 static int x509_subject_cmp(X509 **a, X509 **b)
150 return X509_subject_name_cmp(*a, *b);
153 /* Return 1 is a certificate is self signed */
154 static int cert_self_signed(X509 *x)
156 X509_check_purpose(x, -1, 0);
157 if (x->ex_flags & EXFLAG_SS)
163 /* Given a certificate try and find an exact match in the store */
165 static X509 *lookup_cert_match(X509_STORE_CTX *ctx, X509 *x)
167 STACK_OF(X509) *certs;
170 /* Lookup all certs with matching subject name */
171 certs = ctx->lookup_certs(ctx, X509_get_subject_name(x));
174 /* Look for exact match */
175 for (i = 0; i < sk_X509_num(certs); i++) {
176 xtmp = sk_X509_value(certs, i);
177 if (!X509_cmp(xtmp, x))
180 if (i < sk_X509_num(certs))
181 CRYPTO_add(&xtmp->references, 1, CRYPTO_LOCK_X509);
184 sk_X509_pop_free(certs, X509_free);
188 int X509_verify_cert(X509_STORE_CTX *ctx)
190 X509 *x, *xtmp, *xtmp2, *chain_ss = NULL;
192 X509_VERIFY_PARAM *param = ctx->param;
193 int depth, i, ok = 0;
195 int (*cb) (int xok, X509_STORE_CTX *xctx);
196 STACK_OF(X509) *sktmp = NULL;
197 int trust = X509_TRUST_UNTRUSTED;
200 if (ctx->cert == NULL) {
201 X509err(X509_F_X509_VERIFY_CERT, X509_R_NO_CERT_SET_FOR_US_TO_VERIFY);
204 if (ctx->chain != NULL) {
206 * This X509_STORE_CTX has already been used to verify a cert. We
207 * cannot do another one.
209 X509err(X509_F_X509_VERIFY_CERT, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
216 * first we make sure the chain we are going to build is present and that
217 * the first entry is in place
219 if (((ctx->chain = sk_X509_new_null()) == NULL) ||
220 (!sk_X509_push(ctx->chain, ctx->cert))) {
221 X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
225 CRYPTO_add(&ctx->cert->references, 1, CRYPTO_LOCK_X509);
226 ctx->last_untrusted = 1;
228 /* We use a temporary STACK so we can chop and hack at it */
229 if (ctx->untrusted != NULL
230 && (sktmp = sk_X509_dup(ctx->untrusted)) == NULL) {
231 X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
236 num = sk_X509_num(ctx->chain);
237 x = sk_X509_value(ctx->chain, num - 1);
238 depth = param->depth;
241 /* If we have enough, we break */
243 break; /* FIXME: If this happens, we should take
244 * note of it and, if appropriate, use the
245 * X509_V_ERR_CERT_CHAIN_TOO_LONG error code
248 /* If we are self signed, we break */
249 if (cert_self_signed(x))
252 * If asked see if we can find issuer in trusted store first
254 if (ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST) {
255 ok = ctx->get_issuer(&xtmp, ctx, x);
259 * If successful for now free up cert so it will be picked up
268 /* If we were passed a cert chain, use it first */
269 if (ctx->untrusted != NULL) {
270 xtmp = find_issuer(ctx, sktmp, x);
272 if (!sk_X509_push(ctx->chain, xtmp)) {
273 X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
277 CRYPTO_add(&xtmp->references, 1, CRYPTO_LOCK_X509);
278 (void)sk_X509_delete_ptr(sktmp, xtmp);
279 ctx->last_untrusted++;
283 * reparse the full chain for the next one
291 /* Remember how many untrusted certs we have */
294 * at this point, chain should contain a list of untrusted certificates.
295 * We now need to add at least one trusted one, if possible, otherwise we
301 * Examine last certificate in chain and see if it is self signed.
303 i = sk_X509_num(ctx->chain);
304 x = sk_X509_value(ctx->chain, i - 1);
305 if (cert_self_signed(x)) {
306 /* we have a self signed certificate */
307 if (sk_X509_num(ctx->chain) == 1) {
309 * We have a single self signed certificate: see if we can
310 * find it in the store. We must have an exact match to avoid
311 * possible impersonation.
313 ok = ctx->get_issuer(&xtmp, ctx, x);
314 if ((ok <= 0) || X509_cmp(x, xtmp)) {
315 ctx->error = X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT;
316 ctx->current_cert = x;
317 ctx->error_depth = i - 1;
326 * We have a match: replace certificate with store
327 * version so we get any trust settings.
331 (void)sk_X509_set(ctx->chain, i - 1, x);
332 ctx->last_untrusted = 0;
336 * extract and save self signed certificate for later use
338 chain_ss = sk_X509_pop(ctx->chain);
339 ctx->last_untrusted--;
342 x = sk_X509_value(ctx->chain, num - 1);
345 /* We now lookup certs from the certificate store */
347 /* If we have enough, we break */
350 /* If we are self signed, we break */
351 if (cert_self_signed(x))
353 ok = ctx->get_issuer(&xtmp, ctx, x);
360 if (!sk_X509_push(ctx->chain, x)) {
362 X509err(X509_F_X509_VERIFY_CERT, ERR_R_MALLOC_FAILURE);
369 /* we now have our chain, lets check it... */
370 if ((trust = check_trust(ctx)) == X509_TRUST_REJECTED) {
371 /* Callback already issued */
377 * If it's not explicitly trusted then check if there is an alternative
378 * chain that could be used. We only do this if we haven't already
379 * checked via TRUSTED_FIRST and the user hasn't switched off alternate
383 if (trust != X509_TRUST_TRUSTED
384 && !(ctx->param->flags & X509_V_FLAG_TRUSTED_FIRST)
385 && !(ctx->param->flags & X509_V_FLAG_NO_ALT_CHAINS)) {
387 xtmp2 = sk_X509_value(ctx->chain, j - 1);
388 ok = ctx->get_issuer(&xtmp, ctx, xtmp2);
391 /* Check if we found an alternate chain */
394 * Free up the found cert we'll add it again later
399 * Dump all the certs above this point - we've found an
403 xtmp = sk_X509_pop(ctx->chain);
407 ctx->last_untrusted = sk_X509_num(ctx->chain);
416 * If not explicitly trusted then indicate error unless it's a single
417 * self signed certificate in which case we've indicated an error already
418 * and set bad_chain == 1
420 if (trust != X509_TRUST_TRUSTED && !bad_chain) {
421 if ((chain_ss == NULL) || !ctx->check_issued(ctx, x, chain_ss)) {
422 if (ctx->last_untrusted >= num)
423 ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY;
425 ctx->error = X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT;
426 ctx->current_cert = x;
429 sk_X509_push(ctx->chain, chain_ss);
431 ctx->last_untrusted = num;
432 ctx->current_cert = chain_ss;
433 ctx->error = X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN;
437 ctx->error_depth = num - 1;
444 /* We have the chain complete: now we need to check its purpose */
445 ok = check_chain_extensions(ctx);
450 /* Check name constraints */
452 ok = check_name_constraints(ctx);
462 /* We may as well copy down any DSA parameters that are required */
463 X509_get_pubkey_parameters(NULL, ctx->chain);
466 * Check revocation status: we do this after copying parameters because
467 * they may be needed for CRL signature verification.
470 ok = ctx->check_revocation(ctx);
474 err = X509_chain_check_suiteb(&ctx->error_depth, NULL, ctx->chain,
476 if (err != X509_V_OK) {
478 ctx->current_cert = sk_X509_value(ctx->chain, ctx->error_depth);
484 /* At this point, we have a chain and need to verify it */
485 if (ctx->verify != NULL)
486 ok = ctx->verify(ctx);
488 ok = internal_verify(ctx);
492 #ifndef OPENSSL_NO_RFC3779
493 /* RFC 3779 path validation, now that CRL check has been done */
494 ok = v3_asid_validate_path(ctx);
497 ok = v3_addr_validate_path(ctx);
502 /* If we get this far evaluate policies */
503 if (!bad_chain && (ctx->param->flags & X509_V_FLAG_POLICY_CHECK))
504 ok = ctx->check_policy(ctx);
509 /* Ensure we return an error */
512 X509_get_pubkey_parameters(NULL, ctx->chain);
516 if (chain_ss != NULL)
522 * Given a STACK_OF(X509) find the issuer of cert (if any)
525 static X509 *find_issuer(X509_STORE_CTX *ctx, STACK_OF(X509) *sk, X509 *x)
529 for (i = 0; i < sk_X509_num(sk); i++) {
530 issuer = sk_X509_value(sk, i);
531 if (ctx->check_issued(ctx, x, issuer))
537 /* Given a possible certificate and issuer check them */
539 static int check_issued(X509_STORE_CTX *ctx, X509 *x, X509 *issuer)
542 ret = X509_check_issued(issuer, x);
543 if (ret == X509_V_OK)
545 /* If we haven't asked for issuer errors don't set ctx */
546 if (!(ctx->param->flags & X509_V_FLAG_CB_ISSUER_CHECK))
550 ctx->current_cert = x;
551 ctx->current_issuer = issuer;
552 return ctx->verify_cb(0, ctx);
555 /* Alternative lookup method: look from a STACK stored in other_ctx */
557 static int get_issuer_sk(X509 **issuer, X509_STORE_CTX *ctx, X509 *x)
559 *issuer = find_issuer(ctx, ctx->other_ctx, x);
561 CRYPTO_add(&(*issuer)->references, 1, CRYPTO_LOCK_X509);
568 * Check a certificate chains extensions for consistency with the supplied
572 static int check_chain_extensions(X509_STORE_CTX *ctx)
574 #ifdef OPENSSL_NO_CHAIN_VERIFY
577 int i, ok = 0, must_be_ca, plen = 0;
579 int (*cb) (int xok, X509_STORE_CTX *xctx);
580 int proxy_path_length = 0;
582 int allow_proxy_certs;
586 * must_be_ca can have 1 of 3 values:
587 * -1: we accept both CA and non-CA certificates, to allow direct
588 * use of self-signed certificates (which are marked as CA).
589 * 0: we only accept non-CA certificates. This is currently not
590 * used, but the possibility is present for future extensions.
591 * 1: we only accept CA certificates. This is currently used for
592 * all certificates in the chain except the leaf certificate.
596 /* CRL path validation */
598 allow_proxy_certs = 0;
599 purpose = X509_PURPOSE_CRL_SIGN;
602 ! !(ctx->param->flags & X509_V_FLAG_ALLOW_PROXY_CERTS);
604 * A hack to keep people who don't want to modify their software
607 if (getenv("OPENSSL_ALLOW_PROXY_CERTS"))
608 allow_proxy_certs = 1;
609 purpose = ctx->param->purpose;
612 /* Check all untrusted certificates */
613 for (i = 0; i < ctx->last_untrusted; i++) {
615 x = sk_X509_value(ctx->chain, i);
616 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
617 && (x->ex_flags & EXFLAG_CRITICAL)) {
618 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_EXTENSION;
619 ctx->error_depth = i;
620 ctx->current_cert = x;
625 if (!allow_proxy_certs && (x->ex_flags & EXFLAG_PROXY)) {
626 ctx->error = X509_V_ERR_PROXY_CERTIFICATES_NOT_ALLOWED;
627 ctx->error_depth = i;
628 ctx->current_cert = x;
633 ret = X509_check_ca(x);
634 switch (must_be_ca) {
636 if ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
637 && (ret != 1) && (ret != 0)) {
639 ctx->error = X509_V_ERR_INVALID_CA;
646 ctx->error = X509_V_ERR_INVALID_NON_CA;
652 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
655 ctx->error = X509_V_ERR_INVALID_CA;
661 ctx->error_depth = i;
662 ctx->current_cert = x;
667 if (ctx->param->purpose > 0) {
668 ret = X509_check_purpose(x, purpose, must_be_ca > 0);
670 || ((ctx->param->flags & X509_V_FLAG_X509_STRICT)
672 ctx->error = X509_V_ERR_INVALID_PURPOSE;
673 ctx->error_depth = i;
674 ctx->current_cert = x;
680 /* Check pathlen if not self issued */
681 if ((i > 1) && !(x->ex_flags & EXFLAG_SI)
682 && (x->ex_pathlen != -1)
683 && (plen > (x->ex_pathlen + proxy_path_length + 1))) {
684 ctx->error = X509_V_ERR_PATH_LENGTH_EXCEEDED;
685 ctx->error_depth = i;
686 ctx->current_cert = x;
691 /* Increment path length if not self issued */
692 if (!(x->ex_flags & EXFLAG_SI))
695 * If this certificate is a proxy certificate, the next certificate
696 * must be another proxy certificate or a EE certificate. If not,
697 * the next certificate must be a CA certificate.
699 if (x->ex_flags & EXFLAG_PROXY) {
700 if (x->ex_pcpathlen != -1 && i > x->ex_pcpathlen) {
701 ctx->error = X509_V_ERR_PROXY_PATH_LENGTH_EXCEEDED;
702 ctx->error_depth = i;
703 ctx->current_cert = x;
719 static int check_name_constraints(X509_STORE_CTX *ctx)
723 /* Check name constraints for all certificates */
724 for (i = sk_X509_num(ctx->chain) - 1; i >= 0; i--) {
725 x = sk_X509_value(ctx->chain, i);
726 /* Ignore self issued certs unless last in chain */
727 if (i && (x->ex_flags & EXFLAG_SI))
730 * Check against constraints for all certificates higher in chain
731 * including trust anchor. Trust anchor not strictly speaking needed
732 * but if it includes constraints it is to be assumed it expects them
735 for (j = sk_X509_num(ctx->chain) - 1; j > i; j--) {
736 NAME_CONSTRAINTS *nc = sk_X509_value(ctx->chain, j)->nc;
738 rv = NAME_CONSTRAINTS_check(x, nc);
739 if (rv != X509_V_OK) {
741 ctx->error_depth = i;
742 ctx->current_cert = x;
743 if (!ctx->verify_cb(0, ctx))
752 static int check_id_error(X509_STORE_CTX *ctx, int errcode)
754 ctx->error = errcode;
755 ctx->current_cert = ctx->cert;
756 ctx->error_depth = 0;
757 return ctx->verify_cb(0, ctx);
760 static int check_hosts(X509 *x, X509_VERIFY_PARAM_ID *id)
763 int n = sk_OPENSSL_STRING_num(id->hosts);
766 if (id->peername != NULL) {
767 OPENSSL_free(id->peername);
770 for (i = 0; i < n; ++i) {
771 name = sk_OPENSSL_STRING_value(id->hosts, i);
772 if (X509_check_host(x, name, 0, id->hostflags, &id->peername) > 0)
778 static int check_id(X509_STORE_CTX *ctx)
780 X509_VERIFY_PARAM *vpm = ctx->param;
781 X509_VERIFY_PARAM_ID *id = vpm->id;
783 if (id->hosts && check_hosts(x, id) <= 0) {
784 if (!check_id_error(ctx, X509_V_ERR_HOSTNAME_MISMATCH))
787 if (id->email && X509_check_email(x, id->email, id->emaillen, 0) <= 0) {
788 if (!check_id_error(ctx, X509_V_ERR_EMAIL_MISMATCH))
791 if (id->ip && X509_check_ip(x, id->ip, id->iplen, 0) <= 0) {
792 if (!check_id_error(ctx, X509_V_ERR_IP_ADDRESS_MISMATCH))
798 static int check_trust(X509_STORE_CTX *ctx)
802 int (*cb) (int xok, X509_STORE_CTX *xctx);
804 /* Check all trusted certificates in chain */
805 for (i = ctx->last_untrusted; i < sk_X509_num(ctx->chain); i++) {
806 x = sk_X509_value(ctx->chain, i);
807 ok = X509_check_trust(x, ctx->param->trust, 0);
808 /* If explicitly trusted return trusted */
809 if (ok == X509_TRUST_TRUSTED)
810 return X509_TRUST_TRUSTED;
812 * If explicitly rejected notify callback and reject if not
815 if (ok == X509_TRUST_REJECTED) {
816 ctx->error_depth = i;
817 ctx->current_cert = x;
818 ctx->error = X509_V_ERR_CERT_REJECTED;
821 return X509_TRUST_REJECTED;
825 * If we accept partial chains and have at least one trusted certificate
828 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
830 if (ctx->last_untrusted < sk_X509_num(ctx->chain))
831 return X509_TRUST_TRUSTED;
832 x = sk_X509_value(ctx->chain, 0);
833 mx = lookup_cert_match(ctx, x);
835 (void)sk_X509_set(ctx->chain, 0, mx);
837 ctx->last_untrusted = 0;
838 return X509_TRUST_TRUSTED;
843 * If no trusted certs in chain at all return untrusted and allow
844 * standard (no issuer cert) etc errors to be indicated.
846 return X509_TRUST_UNTRUSTED;
849 static int check_revocation(X509_STORE_CTX *ctx)
852 if (!(ctx->param->flags & X509_V_FLAG_CRL_CHECK))
854 if (ctx->param->flags & X509_V_FLAG_CRL_CHECK_ALL)
855 last = sk_X509_num(ctx->chain) - 1;
857 /* If checking CRL paths this isn't the EE certificate */
862 for (i = 0; i <= last; i++) {
863 ctx->error_depth = i;
864 ok = check_cert(ctx);
871 static int check_cert(X509_STORE_CTX *ctx)
873 X509_CRL *crl = NULL, *dcrl = NULL;
876 unsigned int last_reasons;
877 cnum = ctx->error_depth;
878 x = sk_X509_value(ctx->chain, cnum);
879 ctx->current_cert = x;
880 ctx->current_issuer = NULL;
881 ctx->current_crl_score = 0;
882 ctx->current_reasons = 0;
883 while (ctx->current_reasons != CRLDP_ALL_REASONS) {
884 last_reasons = ctx->current_reasons;
885 /* Try to retrieve relevant CRL */
887 ok = ctx->get_crl(ctx, &crl, x);
889 ok = get_crl_delta(ctx, &crl, &dcrl, x);
891 * If error looking up CRL, nothing we can do except notify callback
894 ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
895 ok = ctx->verify_cb(0, ctx);
898 ctx->current_crl = crl;
899 ok = ctx->check_crl(ctx, crl);
904 ok = ctx->check_crl(ctx, dcrl);
907 ok = ctx->cert_crl(ctx, dcrl, x);
913 /* Don't look in full CRL if delta reason is removefromCRL */
915 ok = ctx->cert_crl(ctx, crl, x);
925 * If reasons not updated we wont get anywhere by another iteration,
928 if (last_reasons == ctx->current_reasons) {
929 ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL;
930 ok = ctx->verify_cb(0, ctx);
938 ctx->current_crl = NULL;
943 /* Check CRL times against values in X509_STORE_CTX */
945 static int check_crl_time(X509_STORE_CTX *ctx, X509_CRL *crl, int notify)
950 ctx->current_crl = crl;
951 if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
952 ptime = &ctx->param->check_time;
956 i = X509_cmp_time(X509_CRL_get_lastUpdate(crl), ptime);
960 ctx->error = X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD;
961 if (!ctx->verify_cb(0, ctx))
968 ctx->error = X509_V_ERR_CRL_NOT_YET_VALID;
969 if (!ctx->verify_cb(0, ctx))
973 if (X509_CRL_get_nextUpdate(crl)) {
974 i = X509_cmp_time(X509_CRL_get_nextUpdate(crl), ptime);
979 ctx->error = X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD;
980 if (!ctx->verify_cb(0, ctx))
983 /* Ignore expiry of base CRL is delta is valid */
984 if ((i < 0) && !(ctx->current_crl_score & CRL_SCORE_TIME_DELTA)) {
987 ctx->error = X509_V_ERR_CRL_HAS_EXPIRED;
988 if (!ctx->verify_cb(0, ctx))
994 ctx->current_crl = NULL;
999 static int get_crl_sk(X509_STORE_CTX *ctx, X509_CRL **pcrl, X509_CRL **pdcrl,
1000 X509 **pissuer, int *pscore, unsigned int *preasons,
1001 STACK_OF(X509_CRL) *crls)
1003 int i, crl_score, best_score = *pscore;
1004 unsigned int reasons, best_reasons = 0;
1005 X509 *x = ctx->current_cert;
1006 X509_CRL *crl, *best_crl = NULL;
1007 X509 *crl_issuer = NULL, *best_crl_issuer = NULL;
1009 for (i = 0; i < sk_X509_CRL_num(crls); i++) {
1010 crl = sk_X509_CRL_value(crls, i);
1011 reasons = *preasons;
1012 crl_score = get_crl_score(ctx, &crl_issuer, &reasons, crl, x);
1014 if (crl_score > best_score) {
1016 best_crl_issuer = crl_issuer;
1017 best_score = crl_score;
1018 best_reasons = reasons;
1024 X509_CRL_free(*pcrl);
1026 *pissuer = best_crl_issuer;
1027 *pscore = best_score;
1028 *preasons = best_reasons;
1029 CRYPTO_add(&best_crl->references, 1, CRYPTO_LOCK_X509_CRL);
1031 X509_CRL_free(*pdcrl);
1034 get_delta_sk(ctx, pdcrl, pscore, best_crl, crls);
1037 if (best_score >= CRL_SCORE_VALID)
1044 * Compare two CRL extensions for delta checking purposes. They should be
1045 * both present or both absent. If both present all fields must be identical.
1048 static int crl_extension_match(X509_CRL *a, X509_CRL *b, int nid)
1050 ASN1_OCTET_STRING *exta, *extb;
1052 i = X509_CRL_get_ext_by_NID(a, nid, -1);
1054 /* Can't have multiple occurrences */
1055 if (X509_CRL_get_ext_by_NID(a, nid, i) != -1)
1057 exta = X509_EXTENSION_get_data(X509_CRL_get_ext(a, i));
1061 i = X509_CRL_get_ext_by_NID(b, nid, -1);
1065 if (X509_CRL_get_ext_by_NID(b, nid, i) != -1)
1067 extb = X509_EXTENSION_get_data(X509_CRL_get_ext(b, i));
1077 if (ASN1_OCTET_STRING_cmp(exta, extb))
1083 /* See if a base and delta are compatible */
1085 static int check_delta_base(X509_CRL *delta, X509_CRL *base)
1087 /* Delta CRL must be a delta */
1088 if (!delta->base_crl_number)
1090 /* Base must have a CRL number */
1091 if (!base->crl_number)
1093 /* Issuer names must match */
1094 if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(delta)))
1096 /* AKID and IDP must match */
1097 if (!crl_extension_match(delta, base, NID_authority_key_identifier))
1099 if (!crl_extension_match(delta, base, NID_issuing_distribution_point))
1101 /* Delta CRL base number must not exceed Full CRL number. */
1102 if (ASN1_INTEGER_cmp(delta->base_crl_number, base->crl_number) > 0)
1104 /* Delta CRL number must exceed full CRL number */
1105 if (ASN1_INTEGER_cmp(delta->crl_number, base->crl_number) > 0)
1111 * For a given base CRL find a delta... maybe extend to delta scoring or
1112 * retrieve a chain of deltas...
1115 static void get_delta_sk(X509_STORE_CTX *ctx, X509_CRL **dcrl, int *pscore,
1116 X509_CRL *base, STACK_OF(X509_CRL) *crls)
1120 if (!(ctx->param->flags & X509_V_FLAG_USE_DELTAS))
1122 if (!((ctx->current_cert->ex_flags | base->flags) & EXFLAG_FRESHEST))
1124 for (i = 0; i < sk_X509_CRL_num(crls); i++) {
1125 delta = sk_X509_CRL_value(crls, i);
1126 if (check_delta_base(delta, base)) {
1127 if (check_crl_time(ctx, delta, 0))
1128 *pscore |= CRL_SCORE_TIME_DELTA;
1129 CRYPTO_add(&delta->references, 1, CRYPTO_LOCK_X509_CRL);
1138 * For a given CRL return how suitable it is for the supplied certificate
1139 * 'x'. The return value is a mask of several criteria. If the issuer is not
1140 * the certificate issuer this is returned in *pissuer. The reasons mask is
1141 * also used to determine if the CRL is suitable: if no new reasons the CRL
1142 * is rejected, otherwise reasons is updated.
1145 static int get_crl_score(X509_STORE_CTX *ctx, X509 **pissuer,
1146 unsigned int *preasons, X509_CRL *crl, X509 *x)
1150 unsigned int tmp_reasons = *preasons, crl_reasons;
1152 /* First see if we can reject CRL straight away */
1154 /* Invalid IDP cannot be processed */
1155 if (crl->idp_flags & IDP_INVALID)
1157 /* Reason codes or indirect CRLs need extended CRL support */
1158 if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT)) {
1159 if (crl->idp_flags & (IDP_INDIRECT | IDP_REASONS))
1161 } else if (crl->idp_flags & IDP_REASONS) {
1162 /* If no new reasons reject */
1163 if (!(crl->idp_reasons & ~tmp_reasons))
1166 /* Don't process deltas at this stage */
1167 else if (crl->base_crl_number)
1169 /* If issuer name doesn't match certificate need indirect CRL */
1170 if (X509_NAME_cmp(X509_get_issuer_name(x), X509_CRL_get_issuer(crl))) {
1171 if (!(crl->idp_flags & IDP_INDIRECT))
1174 crl_score |= CRL_SCORE_ISSUER_NAME;
1176 if (!(crl->flags & EXFLAG_CRITICAL))
1177 crl_score |= CRL_SCORE_NOCRITICAL;
1180 if (check_crl_time(ctx, crl, 0))
1181 crl_score |= CRL_SCORE_TIME;
1183 /* Check authority key ID and locate certificate issuer */
1184 crl_akid_check(ctx, crl, pissuer, &crl_score);
1186 /* If we can't locate certificate issuer at this point forget it */
1188 if (!(crl_score & CRL_SCORE_AKID))
1191 /* Check cert for matching CRL distribution points */
1193 if (crl_crldp_check(x, crl, crl_score, &crl_reasons)) {
1194 /* If no new reasons reject */
1195 if (!(crl_reasons & ~tmp_reasons))
1197 tmp_reasons |= crl_reasons;
1198 crl_score |= CRL_SCORE_SCOPE;
1201 *preasons = tmp_reasons;
1207 static void crl_akid_check(X509_STORE_CTX *ctx, X509_CRL *crl,
1208 X509 **pissuer, int *pcrl_score)
1210 X509 *crl_issuer = NULL;
1211 X509_NAME *cnm = X509_CRL_get_issuer(crl);
1212 int cidx = ctx->error_depth;
1215 if (cidx != sk_X509_num(ctx->chain) - 1)
1218 crl_issuer = sk_X509_value(ctx->chain, cidx);
1220 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
1221 if (*pcrl_score & CRL_SCORE_ISSUER_NAME) {
1222 *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_ISSUER_CERT;
1223 *pissuer = crl_issuer;
1228 for (cidx++; cidx < sk_X509_num(ctx->chain); cidx++) {
1229 crl_issuer = sk_X509_value(ctx->chain, cidx);
1230 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1232 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
1233 *pcrl_score |= CRL_SCORE_AKID | CRL_SCORE_SAME_PATH;
1234 *pissuer = crl_issuer;
1239 /* Anything else needs extended CRL support */
1241 if (!(ctx->param->flags & X509_V_FLAG_EXTENDED_CRL_SUPPORT))
1245 * Otherwise the CRL issuer is not on the path. Look for it in the set of
1246 * untrusted certificates.
1248 for (i = 0; i < sk_X509_num(ctx->untrusted); i++) {
1249 crl_issuer = sk_X509_value(ctx->untrusted, i);
1250 if (X509_NAME_cmp(X509_get_subject_name(crl_issuer), cnm))
1252 if (X509_check_akid(crl_issuer, crl->akid) == X509_V_OK) {
1253 *pissuer = crl_issuer;
1254 *pcrl_score |= CRL_SCORE_AKID;
1261 * Check the path of a CRL issuer certificate. This creates a new
1262 * X509_STORE_CTX and populates it with most of the parameters from the
1263 * parent. This could be optimised somewhat since a lot of path checking will
1264 * be duplicated by the parent, but this will rarely be used in practice.
1267 static int check_crl_path(X509_STORE_CTX *ctx, X509 *x)
1269 X509_STORE_CTX crl_ctx;
1271 /* Don't allow recursive CRL path validation */
1274 if (!X509_STORE_CTX_init(&crl_ctx, ctx->ctx, x, ctx->untrusted))
1277 crl_ctx.crls = ctx->crls;
1278 /* Copy verify params across */
1279 X509_STORE_CTX_set0_param(&crl_ctx, ctx->param);
1281 crl_ctx.parent = ctx;
1282 crl_ctx.verify_cb = ctx->verify_cb;
1284 /* Verify CRL issuer */
1285 ret = X509_verify_cert(&crl_ctx);
1290 /* Check chain is acceptable */
1292 ret = check_crl_chain(ctx, ctx->chain, crl_ctx.chain);
1294 X509_STORE_CTX_cleanup(&crl_ctx);
1299 * RFC3280 says nothing about the relationship between CRL path and
1300 * certificate path, which could lead to situations where a certificate could
1301 * be revoked or validated by a CA not authorised to do so. RFC5280 is more
1302 * strict and states that the two paths must end in the same trust anchor,
1303 * though some discussions remain... until this is resolved we use the
1307 static int check_crl_chain(X509_STORE_CTX *ctx,
1308 STACK_OF(X509) *cert_path,
1309 STACK_OF(X509) *crl_path)
1311 X509 *cert_ta, *crl_ta;
1312 cert_ta = sk_X509_value(cert_path, sk_X509_num(cert_path) - 1);
1313 crl_ta = sk_X509_value(crl_path, sk_X509_num(crl_path) - 1);
1314 if (!X509_cmp(cert_ta, crl_ta))
1320 * Check for match between two dist point names: three separate cases.
1321 * 1. Both are relative names and compare X509_NAME types.
1322 * 2. One full, one relative. Compare X509_NAME to GENERAL_NAMES.
1323 * 3. Both are full names and compare two GENERAL_NAMES.
1324 * 4. One is NULL: automatic match.
1327 static int idp_check_dp(DIST_POINT_NAME *a, DIST_POINT_NAME *b)
1329 X509_NAME *nm = NULL;
1330 GENERAL_NAMES *gens = NULL;
1331 GENERAL_NAME *gena, *genb;
1338 /* Case 1: two X509_NAME */
1342 if (!X509_NAME_cmp(a->dpname, b->dpname))
1347 /* Case 2: set name and GENERAL_NAMES appropriately */
1349 gens = b->name.fullname;
1350 } else if (b->type == 1) {
1353 /* Case 2: set name and GENERAL_NAMES appropriately */
1354 gens = a->name.fullname;
1358 /* Handle case 2 with one GENERAL_NAMES and one X509_NAME */
1360 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
1361 gena = sk_GENERAL_NAME_value(gens, i);
1362 if (gena->type != GEN_DIRNAME)
1364 if (!X509_NAME_cmp(nm, gena->d.directoryName))
1370 /* Else case 3: two GENERAL_NAMES */
1372 for (i = 0; i < sk_GENERAL_NAME_num(a->name.fullname); i++) {
1373 gena = sk_GENERAL_NAME_value(a->name.fullname, i);
1374 for (j = 0; j < sk_GENERAL_NAME_num(b->name.fullname); j++) {
1375 genb = sk_GENERAL_NAME_value(b->name.fullname, j);
1376 if (!GENERAL_NAME_cmp(gena, genb))
1385 static int crldp_check_crlissuer(DIST_POINT *dp, X509_CRL *crl, int crl_score)
1388 X509_NAME *nm = X509_CRL_get_issuer(crl);
1389 /* If no CRLissuer return is successful iff don't need a match */
1391 return ! !(crl_score & CRL_SCORE_ISSUER_NAME);
1392 for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
1393 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
1394 if (gen->type != GEN_DIRNAME)
1396 if (!X509_NAME_cmp(gen->d.directoryName, nm))
1402 /* Check CRLDP and IDP */
1404 static int crl_crldp_check(X509 *x, X509_CRL *crl, int crl_score,
1405 unsigned int *preasons)
1408 if (crl->idp_flags & IDP_ONLYATTR)
1410 if (x->ex_flags & EXFLAG_CA) {
1411 if (crl->idp_flags & IDP_ONLYUSER)
1414 if (crl->idp_flags & IDP_ONLYCA)
1417 *preasons = crl->idp_reasons;
1418 for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++) {
1419 DIST_POINT *dp = sk_DIST_POINT_value(x->crldp, i);
1420 if (crldp_check_crlissuer(dp, crl, crl_score)) {
1421 if (!crl->idp || idp_check_dp(dp->distpoint, crl->idp->distpoint)) {
1422 *preasons &= dp->dp_reasons;
1427 if ((!crl->idp || !crl->idp->distpoint)
1428 && (crl_score & CRL_SCORE_ISSUER_NAME))
1434 * Retrieve CRL corresponding to current certificate. If deltas enabled try
1435 * to find a delta CRL too
1438 static int get_crl_delta(X509_STORE_CTX *ctx,
1439 X509_CRL **pcrl, X509_CRL **pdcrl, X509 *x)
1442 X509 *issuer = NULL;
1444 unsigned int reasons;
1445 X509_CRL *crl = NULL, *dcrl = NULL;
1446 STACK_OF(X509_CRL) *skcrl;
1447 X509_NAME *nm = X509_get_issuer_name(x);
1448 reasons = ctx->current_reasons;
1449 ok = get_crl_sk(ctx, &crl, &dcrl,
1450 &issuer, &crl_score, &reasons, ctx->crls);
1455 /* Lookup CRLs from store */
1457 skcrl = ctx->lookup_crls(ctx, nm);
1459 /* If no CRLs found and a near match from get_crl_sk use that */
1463 get_crl_sk(ctx, &crl, &dcrl, &issuer, &crl_score, &reasons, skcrl);
1465 sk_X509_CRL_pop_free(skcrl, X509_CRL_free);
1469 /* If we got any kind of CRL use it and return success */
1471 ctx->current_issuer = issuer;
1472 ctx->current_crl_score = crl_score;
1473 ctx->current_reasons = reasons;
1482 /* Check CRL validity */
1483 static int check_crl(X509_STORE_CTX *ctx, X509_CRL *crl)
1485 X509 *issuer = NULL;
1486 EVP_PKEY *ikey = NULL;
1487 int ok = 0, chnum, cnum;
1488 cnum = ctx->error_depth;
1489 chnum = sk_X509_num(ctx->chain) - 1;
1490 /* if we have an alternative CRL issuer cert use that */
1491 if (ctx->current_issuer)
1492 issuer = ctx->current_issuer;
1495 * Else find CRL issuer: if not last certificate then issuer is next
1496 * certificate in chain.
1498 else if (cnum < chnum)
1499 issuer = sk_X509_value(ctx->chain, cnum + 1);
1501 issuer = sk_X509_value(ctx->chain, chnum);
1502 /* If not self signed, can't check signature */
1503 if (!ctx->check_issued(ctx, issuer, issuer)) {
1504 ctx->error = X509_V_ERR_UNABLE_TO_GET_CRL_ISSUER;
1505 ok = ctx->verify_cb(0, ctx);
1513 * Skip most tests for deltas because they have already been done
1515 if (!crl->base_crl_number) {
1516 /* Check for cRLSign bit if keyUsage present */
1517 if ((issuer->ex_flags & EXFLAG_KUSAGE) &&
1518 !(issuer->ex_kusage & KU_CRL_SIGN)) {
1519 ctx->error = X509_V_ERR_KEYUSAGE_NO_CRL_SIGN;
1520 ok = ctx->verify_cb(0, ctx);
1525 if (!(ctx->current_crl_score & CRL_SCORE_SCOPE)) {
1526 ctx->error = X509_V_ERR_DIFFERENT_CRL_SCOPE;
1527 ok = ctx->verify_cb(0, ctx);
1532 if (!(ctx->current_crl_score & CRL_SCORE_SAME_PATH)) {
1533 if (check_crl_path(ctx, ctx->current_issuer) <= 0) {
1534 ctx->error = X509_V_ERR_CRL_PATH_VALIDATION_ERROR;
1535 ok = ctx->verify_cb(0, ctx);
1541 if (crl->idp_flags & IDP_INVALID) {
1542 ctx->error = X509_V_ERR_INVALID_EXTENSION;
1543 ok = ctx->verify_cb(0, ctx);
1550 if (!(ctx->current_crl_score & CRL_SCORE_TIME)) {
1551 ok = check_crl_time(ctx, crl, 1);
1556 /* Attempt to get issuer certificate public key */
1557 ikey = X509_get_pubkey(issuer);
1560 ctx->error = X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1561 ok = ctx->verify_cb(0, ctx);
1566 rv = X509_CRL_check_suiteb(crl, ikey, ctx->param->flags);
1567 if (rv != X509_V_OK) {
1569 ok = ctx->verify_cb(0, ctx);
1573 /* Verify CRL signature */
1574 if (X509_CRL_verify(crl, ikey) <= 0) {
1575 ctx->error = X509_V_ERR_CRL_SIGNATURE_FAILURE;
1576 ok = ctx->verify_cb(0, ctx);
1586 EVP_PKEY_free(ikey);
1590 /* Check certificate against CRL */
1591 static int cert_crl(X509_STORE_CTX *ctx, X509_CRL *crl, X509 *x)
1596 * The rules changed for this... previously if a CRL contained unhandled
1597 * critical extensions it could still be used to indicate a certificate
1598 * was revoked. This has since been changed since critical extension can
1599 * change the meaning of CRL entries.
1601 if (!(ctx->param->flags & X509_V_FLAG_IGNORE_CRITICAL)
1602 && (crl->flags & EXFLAG_CRITICAL)) {
1603 ctx->error = X509_V_ERR_UNHANDLED_CRITICAL_CRL_EXTENSION;
1604 ok = ctx->verify_cb(0, ctx);
1609 * Look for serial number of certificate in CRL If found make sure reason
1610 * is not removeFromCRL.
1612 if (X509_CRL_get0_by_cert(crl, &rev, x)) {
1613 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
1615 ctx->error = X509_V_ERR_CERT_REVOKED;
1616 ok = ctx->verify_cb(0, ctx);
1624 static int check_policy(X509_STORE_CTX *ctx)
1629 ret = X509_policy_check(&ctx->tree, &ctx->explicit_policy, ctx->chain,
1630 ctx->param->policies, ctx->param->flags);
1632 X509err(X509_F_CHECK_POLICY, ERR_R_MALLOC_FAILURE);
1635 /* Invalid or inconsistent extensions */
1638 * Locate certificates with bad extensions and notify callback.
1642 for (i = 1; i < sk_X509_num(ctx->chain); i++) {
1643 x = sk_X509_value(ctx->chain, i);
1644 if (!(x->ex_flags & EXFLAG_INVALID_POLICY))
1646 ctx->current_cert = x;
1647 ctx->error = X509_V_ERR_INVALID_POLICY_EXTENSION;
1648 if (!ctx->verify_cb(0, ctx))
1654 ctx->current_cert = NULL;
1655 ctx->error = X509_V_ERR_NO_EXPLICIT_POLICY;
1656 return ctx->verify_cb(0, ctx);
1659 if (ctx->param->flags & X509_V_FLAG_NOTIFY_POLICY) {
1660 ctx->current_cert = NULL;
1661 ctx->error = X509_V_OK;
1662 if (!ctx->verify_cb(2, ctx))
1669 static int check_cert_time(X509_STORE_CTX *ctx, X509 *x)
1674 if (ctx->param->flags & X509_V_FLAG_USE_CHECK_TIME)
1675 ptime = &ctx->param->check_time;
1679 i = X509_cmp_time(X509_get_notBefore(x), ptime);
1681 ctx->error = X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD;
1682 ctx->current_cert = x;
1683 if (!ctx->verify_cb(0, ctx))
1688 ctx->error = X509_V_ERR_CERT_NOT_YET_VALID;
1689 ctx->current_cert = x;
1690 if (!ctx->verify_cb(0, ctx))
1694 i = X509_cmp_time(X509_get_notAfter(x), ptime);
1696 ctx->error = X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD;
1697 ctx->current_cert = x;
1698 if (!ctx->verify_cb(0, ctx))
1703 ctx->error = X509_V_ERR_CERT_HAS_EXPIRED;
1704 ctx->current_cert = x;
1705 if (!ctx->verify_cb(0, ctx))
1712 static int internal_verify(X509_STORE_CTX *ctx)
1716 EVP_PKEY *pkey = NULL;
1717 int (*cb) (int xok, X509_STORE_CTX *xctx);
1719 cb = ctx->verify_cb;
1721 n = sk_X509_num(ctx->chain);
1722 ctx->error_depth = n - 1;
1724 xi = sk_X509_value(ctx->chain, n);
1726 if (ctx->check_issued(ctx, xi, xi))
1729 if (ctx->param->flags & X509_V_FLAG_PARTIAL_CHAIN) {
1734 ctx->error = X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE;
1735 ctx->current_cert = xi;
1740 ctx->error_depth = n;
1741 xs = sk_X509_value(ctx->chain, n);
1745 /* ctx->error=0; not needed */
1747 ctx->error_depth = n;
1750 * Skip signature check for self signed certificates unless
1751 * explicitly asked for. It doesn't add any security and just wastes
1756 || (ctx->param->flags & X509_V_FLAG_CHECK_SS_SIGNATURE))) {
1757 if ((pkey = X509_get_pubkey(xi)) == NULL) {
1758 ctx->error = X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY;
1759 ctx->current_cert = xi;
1760 ok = (*cb) (0, ctx);
1763 } else if (X509_verify(xs, pkey) <= 0) {
1764 ctx->error = X509_V_ERR_CERT_SIGNATURE_FAILURE;
1765 ctx->current_cert = xs;
1766 ok = (*cb) (0, ctx);
1768 EVP_PKEY_free(pkey);
1772 EVP_PKEY_free(pkey);
1779 ok = check_cert_time(ctx, xs);
1783 /* The last error (if any) is still in the error value */
1784 ctx->current_issuer = xi;
1785 ctx->current_cert = xs;
1786 ok = (*cb) (1, ctx);
1793 xs = sk_X509_value(ctx->chain, n);
1801 int X509_cmp_current_time(const ASN1_TIME *ctm)
1803 return X509_cmp_time(ctm, NULL);
1806 int X509_cmp_time(const ASN1_TIME *ctm, time_t *cmp_time)
1811 char buff1[24], buff2[24], *p;
1812 int i, j, remaining;
1815 remaining = ctm->length;
1816 str = (char *)ctm->data;
1818 * Note that the following (historical) code allows much more slack in the
1819 * time format than RFC5280. In RFC5280, the representation is fixed:
1820 * UTCTime: YYMMDDHHMMSSZ
1821 * GeneralizedTime: YYYYMMDDHHMMSSZ
1823 if (ctm->type == V_ASN1_UTCTIME) {
1824 /* YYMMDDHHMM[SS]Z or YYMMDDHHMM[SS](+-)hhmm */
1825 int min_length = sizeof("YYMMDDHHMMZ") - 1;
1826 int max_length = sizeof("YYMMDDHHMMSS+hhmm") - 1;
1827 if (remaining < min_length || remaining > max_length)
1834 /* YYYYMMDDHHMM[SS[.fff]]Z or YYYYMMDDHHMM[SS[.f[f[f]]]](+-)hhmm */
1835 int min_length = sizeof("YYYYMMDDHHMMZ") - 1;
1836 int max_length = sizeof("YYYYMMDDHHMMSS.fff+hhmm") - 1;
1837 if (remaining < min_length || remaining > max_length)
1845 if ((*str == 'Z') || (*str == '-') || (*str == '+')) {
1856 * Skip any (up to three) fractional seconds...
1857 * TODO(emilia): in RFC5280, fractional seconds are forbidden.
1858 * Can we just kill them altogether?
1860 if (remaining && *str == '.') {
1863 for (i = 0; i < 3 && remaining; i++, str++, remaining--) {
1864 if (*str < '0' || *str > '9')
1873 /* We now need either a terminating 'Z' or an offset. */
1882 if ((*str != '+') && (*str != '-'))
1884 /* Historical behaviour: the (+-)hhmm offset is forbidden in RFC5280. */
1887 if (str[1] < '0' || str[1] > '9' || str[2] < '0' || str[2] > '9' ||
1888 str[3] < '0' || str[3] > '9' || str[4] < '0' || str[4] > '9')
1890 offset = ((str[1] - '0') * 10 + (str[2] - '0')) * 60;
1891 offset += (str[3] - '0') * 10 + (str[4] - '0');
1895 atm.type = ctm->type;
1897 atm.length = sizeof(buff2);
1898 atm.data = (unsigned char *)buff2;
1900 if (X509_time_adj(&atm, offset * 60, cmp_time) == NULL)
1903 if (ctm->type == V_ASN1_UTCTIME) {
1904 i = (buff1[0] - '0') * 10 + (buff1[1] - '0');
1906 i += 100; /* cf. RFC 2459 */
1907 j = (buff2[0] - '0') * 10 + (buff2[1] - '0');
1916 i = strcmp(buff1, buff2);
1917 if (i == 0) /* wait a second then return younger :-) */
1923 ASN1_TIME *X509_gmtime_adj(ASN1_TIME *s, long adj)
1925 return X509_time_adj(s, adj, NULL);
1928 ASN1_TIME *X509_time_adj(ASN1_TIME *s, long offset_sec, time_t *in_tm)
1930 return X509_time_adj_ex(s, 0, offset_sec, in_tm);
1933 ASN1_TIME *X509_time_adj_ex(ASN1_TIME *s,
1934 int offset_day, long offset_sec, time_t *in_tm)
1943 if (s && !(s->flags & ASN1_STRING_FLAG_MSTRING)) {
1944 if (s->type == V_ASN1_UTCTIME)
1945 return ASN1_UTCTIME_adj(s, t, offset_day, offset_sec);
1946 if (s->type == V_ASN1_GENERALIZEDTIME)
1947 return ASN1_GENERALIZEDTIME_adj(s, t, offset_day, offset_sec);
1949 return ASN1_TIME_adj(s, t, offset_day, offset_sec);
1952 int X509_get_pubkey_parameters(EVP_PKEY *pkey, STACK_OF(X509) *chain)
1954 EVP_PKEY *ktmp = NULL, *ktmp2;
1957 if ((pkey != NULL) && !EVP_PKEY_missing_parameters(pkey))
1960 for (i = 0; i < sk_X509_num(chain); i++) {
1961 ktmp = X509_get_pubkey(sk_X509_value(chain, i));
1963 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,
1964 X509_R_UNABLE_TO_GET_CERTS_PUBLIC_KEY);
1967 if (!EVP_PKEY_missing_parameters(ktmp))
1970 EVP_PKEY_free(ktmp);
1975 X509err(X509_F_X509_GET_PUBKEY_PARAMETERS,
1976 X509_R_UNABLE_TO_FIND_PARAMETERS_IN_CHAIN);
1980 /* first, populate the other certs */
1981 for (j = i - 1; j >= 0; j--) {
1982 ktmp2 = X509_get_pubkey(sk_X509_value(chain, j));
1983 EVP_PKEY_copy_parameters(ktmp2, ktmp);
1984 EVP_PKEY_free(ktmp2);
1988 EVP_PKEY_copy_parameters(pkey, ktmp);
1989 EVP_PKEY_free(ktmp);
1993 /* Make a delta CRL as the diff between two full CRLs */
1995 X509_CRL *X509_CRL_diff(X509_CRL *base, X509_CRL *newer,
1996 EVP_PKEY *skey, const EVP_MD *md, unsigned int flags)
1998 X509_CRL *crl = NULL;
2000 STACK_OF(X509_REVOKED) *revs = NULL;
2001 /* CRLs can't be delta already */
2002 if (base->base_crl_number || newer->base_crl_number) {
2003 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_ALREADY_DELTA);
2006 /* Base and new CRL must have a CRL number */
2007 if (!base->crl_number || !newer->crl_number) {
2008 X509err(X509_F_X509_CRL_DIFF, X509_R_NO_CRL_NUMBER);
2011 /* Issuer names must match */
2012 if (X509_NAME_cmp(X509_CRL_get_issuer(base), X509_CRL_get_issuer(newer))) {
2013 X509err(X509_F_X509_CRL_DIFF, X509_R_ISSUER_MISMATCH);
2016 /* AKID and IDP must match */
2017 if (!crl_extension_match(base, newer, NID_authority_key_identifier)) {
2018 X509err(X509_F_X509_CRL_DIFF, X509_R_AKID_MISMATCH);
2021 if (!crl_extension_match(base, newer, NID_issuing_distribution_point)) {
2022 X509err(X509_F_X509_CRL_DIFF, X509_R_IDP_MISMATCH);
2025 /* Newer CRL number must exceed full CRL number */
2026 if (ASN1_INTEGER_cmp(newer->crl_number, base->crl_number) <= 0) {
2027 X509err(X509_F_X509_CRL_DIFF, X509_R_NEWER_CRL_NOT_NEWER);
2030 /* CRLs must verify */
2031 if (skey && (X509_CRL_verify(base, skey) <= 0 ||
2032 X509_CRL_verify(newer, skey) <= 0)) {
2033 X509err(X509_F_X509_CRL_DIFF, X509_R_CRL_VERIFY_FAILURE);
2036 /* Create new CRL */
2037 crl = X509_CRL_new();
2038 if (!crl || !X509_CRL_set_version(crl, 1))
2040 /* Set issuer name */
2041 if (!X509_CRL_set_issuer_name(crl, X509_CRL_get_issuer(newer)))
2044 if (!X509_CRL_set_lastUpdate(crl, X509_CRL_get_lastUpdate(newer)))
2046 if (!X509_CRL_set_nextUpdate(crl, X509_CRL_get_nextUpdate(newer)))
2049 /* Set base CRL number: must be critical */
2051 if (!X509_CRL_add1_ext_i2d(crl, NID_delta_crl, base->crl_number, 1, 0))
2055 * Copy extensions across from newest CRL to delta: this will set CRL
2056 * number to correct value too.
2059 for (i = 0; i < X509_CRL_get_ext_count(newer); i++) {
2060 X509_EXTENSION *ext;
2061 ext = X509_CRL_get_ext(newer, i);
2062 if (!X509_CRL_add_ext(crl, ext, -1))
2066 /* Go through revoked entries, copying as needed */
2068 revs = X509_CRL_get_REVOKED(newer);
2070 for (i = 0; i < sk_X509_REVOKED_num(revs); i++) {
2071 X509_REVOKED *rvn, *rvtmp;
2072 rvn = sk_X509_REVOKED_value(revs, i);
2074 * Add only if not also in base. TODO: need something cleverer here
2075 * for some more complex CRLs covering multiple CAs.
2077 if (!X509_CRL_get0_by_serial(base, &rvtmp, rvn->serialNumber)) {
2078 rvtmp = X509_REVOKED_dup(rvn);
2081 if (!X509_CRL_add0_revoked(crl, rvtmp)) {
2082 X509_REVOKED_free(rvtmp);
2087 /* TODO: optionally prune deleted entries */
2089 if (skey && md && !X509_CRL_sign(crl, skey, md))
2095 X509err(X509_F_X509_CRL_DIFF, ERR_R_MALLOC_FAILURE);
2101 int X509_STORE_CTX_get_ex_new_index(long argl, void *argp,
2102 CRYPTO_EX_new *new_func,
2103 CRYPTO_EX_dup *dup_func,
2104 CRYPTO_EX_free *free_func)
2107 * This function is (usually) called only once, by
2108 * SSL_get_ex_data_X509_STORE_CTX_idx (ssl/ssl_cert.c).
2110 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_X509_STORE_CTX, argl, argp,
2111 new_func, dup_func, free_func);
2114 int X509_STORE_CTX_set_ex_data(X509_STORE_CTX *ctx, int idx, void *data)
2116 return CRYPTO_set_ex_data(&ctx->ex_data, idx, data);
2119 void *X509_STORE_CTX_get_ex_data(X509_STORE_CTX *ctx, int idx)
2121 return CRYPTO_get_ex_data(&ctx->ex_data, idx);
2124 int X509_STORE_CTX_get_error(X509_STORE_CTX *ctx)
2129 void X509_STORE_CTX_set_error(X509_STORE_CTX *ctx, int err)
2134 int X509_STORE_CTX_get_error_depth(X509_STORE_CTX *ctx)
2136 return ctx->error_depth;
2139 X509 *X509_STORE_CTX_get_current_cert(X509_STORE_CTX *ctx)
2141 return ctx->current_cert;
2144 STACK_OF(X509) *X509_STORE_CTX_get_chain(X509_STORE_CTX *ctx)
2149 STACK_OF(X509) *X509_STORE_CTX_get1_chain(X509_STORE_CTX *ctx)
2153 return X509_chain_up_ref(ctx->chain);
2156 X509 *X509_STORE_CTX_get0_current_issuer(X509_STORE_CTX *ctx)
2158 return ctx->current_issuer;
2161 X509_CRL *X509_STORE_CTX_get0_current_crl(X509_STORE_CTX *ctx)
2163 return ctx->current_crl;
2166 X509_STORE_CTX *X509_STORE_CTX_get0_parent_ctx(X509_STORE_CTX *ctx)
2171 void X509_STORE_CTX_set_cert(X509_STORE_CTX *ctx, X509 *x)
2176 void X509_STORE_CTX_set_chain(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2178 ctx->untrusted = sk;
2181 void X509_STORE_CTX_set0_crls(X509_STORE_CTX *ctx, STACK_OF(X509_CRL) *sk)
2186 int X509_STORE_CTX_set_purpose(X509_STORE_CTX *ctx, int purpose)
2188 return X509_STORE_CTX_purpose_inherit(ctx, 0, purpose, 0);
2191 int X509_STORE_CTX_set_trust(X509_STORE_CTX *ctx, int trust)
2193 return X509_STORE_CTX_purpose_inherit(ctx, 0, 0, trust);
2197 * This function is used to set the X509_STORE_CTX purpose and trust values.
2198 * This is intended to be used when another structure has its own trust and
2199 * purpose values which (if set) will be inherited by the ctx. If they aren't
2200 * set then we will usually have a default purpose in mind which should then
2201 * be used to set the trust value. An example of this is SSL use: an SSL
2202 * structure will have its own purpose and trust settings which the
2203 * application can set: if they aren't set then we use the default of SSL
2207 int X509_STORE_CTX_purpose_inherit(X509_STORE_CTX *ctx, int def_purpose,
2208 int purpose, int trust)
2211 /* If purpose not set use default */
2213 purpose = def_purpose;
2214 /* If we have a purpose then check it is valid */
2217 idx = X509_PURPOSE_get_by_id(purpose);
2219 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2220 X509_R_UNKNOWN_PURPOSE_ID);
2223 ptmp = X509_PURPOSE_get0(idx);
2224 if (ptmp->trust == X509_TRUST_DEFAULT) {
2225 idx = X509_PURPOSE_get_by_id(def_purpose);
2227 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2228 X509_R_UNKNOWN_PURPOSE_ID);
2231 ptmp = X509_PURPOSE_get0(idx);
2233 /* If trust not set then get from purpose default */
2235 trust = ptmp->trust;
2238 idx = X509_TRUST_get_by_id(trust);
2240 X509err(X509_F_X509_STORE_CTX_PURPOSE_INHERIT,
2241 X509_R_UNKNOWN_TRUST_ID);
2246 if (purpose && !ctx->param->purpose)
2247 ctx->param->purpose = purpose;
2248 if (trust && !ctx->param->trust)
2249 ctx->param->trust = trust;
2253 X509_STORE_CTX *X509_STORE_CTX_new(void)
2255 X509_STORE_CTX *ctx;
2256 ctx = (X509_STORE_CTX *)OPENSSL_malloc(sizeof(X509_STORE_CTX));
2258 X509err(X509_F_X509_STORE_CTX_NEW, ERR_R_MALLOC_FAILURE);
2261 memset(ctx, 0, sizeof(X509_STORE_CTX));
2265 void X509_STORE_CTX_free(X509_STORE_CTX *ctx)
2269 X509_STORE_CTX_cleanup(ctx);
2273 int X509_STORE_CTX_init(X509_STORE_CTX *ctx, X509_STORE *store, X509 *x509,
2274 STACK_OF(X509) *chain)
2278 ctx->current_method = 0;
2280 ctx->untrusted = chain;
2282 ctx->last_untrusted = 0;
2283 ctx->other_ctx = NULL;
2287 ctx->explicit_policy = 0;
2288 ctx->error_depth = 0;
2289 ctx->current_cert = NULL;
2290 ctx->current_issuer = NULL;
2291 ctx->current_crl = NULL;
2292 ctx->current_crl_score = 0;
2293 ctx->current_reasons = 0;
2296 /* Zero ex_data to make sure we're cleanup-safe */
2297 memset(&ctx->ex_data, 0, sizeof(ctx->ex_data));
2299 ctx->param = X509_VERIFY_PARAM_new();
2301 X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
2306 * Inherit callbacks and flags from X509_STORE if not set use defaults.
2309 ret = X509_VERIFY_PARAM_inherit(ctx->param, store->param);
2311 ctx->param->inh_flags |= X509_VP_FLAG_DEFAULT | X509_VP_FLAG_ONCE;
2314 ctx->verify_cb = store->verify_cb;
2315 /* Seems to always be 0 in OpenSSL, else must be idempotent */
2316 ctx->cleanup = store->cleanup;
2321 ret = X509_VERIFY_PARAM_inherit(ctx->param,
2322 X509_VERIFY_PARAM_lookup("default"));
2325 X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
2329 if (store && store->check_issued)
2330 ctx->check_issued = store->check_issued;
2332 ctx->check_issued = check_issued;
2334 if (store && store->get_issuer)
2335 ctx->get_issuer = store->get_issuer;
2337 ctx->get_issuer = X509_STORE_CTX_get1_issuer;
2339 if (store && store->verify_cb)
2340 ctx->verify_cb = store->verify_cb;
2342 ctx->verify_cb = null_callback;
2344 if (store && store->verify)
2345 ctx->verify = store->verify;
2347 ctx->verify = internal_verify;
2349 if (store && store->check_revocation)
2350 ctx->check_revocation = store->check_revocation;
2352 ctx->check_revocation = check_revocation;
2354 if (store && store->get_crl)
2355 ctx->get_crl = store->get_crl;
2357 ctx->get_crl = NULL;
2359 if (store && store->check_crl)
2360 ctx->check_crl = store->check_crl;
2362 ctx->check_crl = check_crl;
2364 if (store && store->cert_crl)
2365 ctx->cert_crl = store->cert_crl;
2367 ctx->cert_crl = cert_crl;
2369 if (store && store->lookup_certs)
2370 ctx->lookup_certs = store->lookup_certs;
2372 ctx->lookup_certs = X509_STORE_get1_certs;
2374 if (store && store->lookup_crls)
2375 ctx->lookup_crls = store->lookup_crls;
2377 ctx->lookup_crls = X509_STORE_get1_crls;
2379 ctx->check_policy = check_policy;
2381 if (CRYPTO_new_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx,
2384 X509err(X509_F_X509_STORE_CTX_INIT, ERR_R_MALLOC_FAILURE);
2388 * On error clean up allocated storage, if the store context was not
2389 * allocated with X509_STORE_CTX_new() this is our last chance to do so.
2391 X509_STORE_CTX_cleanup(ctx);
2396 * Set alternative lookup method: just a STACK of trusted certificates. This
2397 * avoids X509_STORE nastiness where it isn't needed.
2400 void X509_STORE_CTX_trusted_stack(X509_STORE_CTX *ctx, STACK_OF(X509) *sk)
2402 ctx->other_ctx = sk;
2403 ctx->get_issuer = get_issuer_sk;
2406 void X509_STORE_CTX_cleanup(X509_STORE_CTX *ctx)
2409 * We need to be idempotent because, unfortunately, free() also calls
2410 * cleanup(), so the natural call sequence new(), init(), cleanup(), free()
2411 * calls cleanup() for the same object twice! Thus we must zero the
2412 * pointers below after they're freed!
2414 /* Seems to always be 0 in OpenSSL, do this at most once. */
2415 if (ctx->cleanup != NULL) {
2417 ctx->cleanup = NULL;
2419 if (ctx->param != NULL) {
2420 if (ctx->parent == NULL)
2421 X509_VERIFY_PARAM_free(ctx->param);
2424 if (ctx->tree != NULL) {
2425 X509_policy_tree_free(ctx->tree);
2428 if (ctx->chain != NULL) {
2429 sk_X509_pop_free(ctx->chain, X509_free);
2432 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_X509_STORE_CTX, ctx, &(ctx->ex_data));
2433 memset(&ctx->ex_data, 0, sizeof(CRYPTO_EX_DATA));
2436 void X509_STORE_CTX_set_depth(X509_STORE_CTX *ctx, int depth)
2438 X509_VERIFY_PARAM_set_depth(ctx->param, depth);
2441 void X509_STORE_CTX_set_flags(X509_STORE_CTX *ctx, unsigned long flags)
2443 X509_VERIFY_PARAM_set_flags(ctx->param, flags);
2446 void X509_STORE_CTX_set_time(X509_STORE_CTX *ctx, unsigned long flags,
2449 X509_VERIFY_PARAM_set_time(ctx->param, t);
2452 void X509_STORE_CTX_set_verify_cb(X509_STORE_CTX *ctx,
2453 int (*verify_cb) (int, X509_STORE_CTX *))
2455 ctx->verify_cb = verify_cb;
2458 X509_POLICY_TREE *X509_STORE_CTX_get0_policy_tree(X509_STORE_CTX *ctx)
2463 int X509_STORE_CTX_get_explicit_policy(X509_STORE_CTX *ctx)
2465 return ctx->explicit_policy;
2468 int X509_STORE_CTX_set_default(X509_STORE_CTX *ctx, const char *name)
2470 const X509_VERIFY_PARAM *param;
2471 param = X509_VERIFY_PARAM_lookup(name);
2474 return X509_VERIFY_PARAM_inherit(ctx->param, param);
2477 X509_VERIFY_PARAM *X509_STORE_CTX_get0_param(X509_STORE_CTX *ctx)
2482 void X509_STORE_CTX_set0_param(X509_STORE_CTX *ctx, X509_VERIFY_PARAM *param)
2485 X509_VERIFY_PARAM_free(ctx->param);
2489 IMPLEMENT_STACK_OF(X509)
2491 IMPLEMENT_ASN1_SET_OF(X509)
2493 IMPLEMENT_STACK_OF(X509_NAME)
2495 IMPLEMENT_STACK_OF(X509_ATTRIBUTE)
2497 IMPLEMENT_ASN1_SET_OF(X509_ATTRIBUTE)