3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
62 #include <openssl/x509v3.h>
63 #include <openssl/x509_vfy.h>
65 static void x509v3_cache_extensions(X509 *x);
67 static int check_ssl_ca(const X509 *x);
68 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
70 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
72 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
74 static int purpose_smime(const X509 *x, int ca);
75 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
77 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
79 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
81 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
83 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
84 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
86 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b);
87 static void xptable_free(X509_PURPOSE *p);
89 static X509_PURPOSE xstandard[] = {
90 {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
91 check_purpose_ssl_client, "SSL client", "sslclient", NULL},
92 {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
93 check_purpose_ssl_server, "SSL server", "sslserver", NULL},
94 {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
95 check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
96 {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
97 "S/MIME signing", "smimesign", NULL},
98 {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
99 check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
100 {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
101 "CRL signing", "crlsign", NULL},
102 {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any",
104 {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
105 "OCSP helper", "ocsphelper", NULL},
106 {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
107 check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign",
111 #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
113 IMPLEMENT_STACK_OF(X509_PURPOSE)
115 static STACK_OF(X509_PURPOSE) *xptable = NULL;
117 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b)
119 return (*a)->purpose - (*b)->purpose;
123 * As much as I'd like to make X509_check_purpose use a "const" X509* I
124 * really can't because it does recalculate hashes and do other non-const
127 int X509_check_purpose(X509 *x, int id, int ca)
130 const X509_PURPOSE *pt;
131 if (!(x->ex_flags & EXFLAG_SET)) {
132 CRYPTO_w_lock(CRYPTO_LOCK_X509);
133 x509v3_cache_extensions(x);
134 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
138 idx = X509_PURPOSE_get_by_id(id);
141 pt = X509_PURPOSE_get0(idx);
142 return pt->check_purpose(pt, x, ca);
145 int X509_PURPOSE_set(int *p, int purpose)
147 if (X509_PURPOSE_get_by_id(purpose) == -1) {
148 X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
155 int X509_PURPOSE_get_count(void)
158 return X509_PURPOSE_COUNT;
159 return sk_X509_PURPOSE_num(xptable) + X509_PURPOSE_COUNT;
162 X509_PURPOSE *X509_PURPOSE_get0(int idx)
166 if (idx < (int)X509_PURPOSE_COUNT)
167 return xstandard + idx;
168 return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
171 int X509_PURPOSE_get_by_sname(char *sname)
175 for (i = 0; i < X509_PURPOSE_get_count(); i++) {
176 xptmp = X509_PURPOSE_get0(i);
177 if (!strcmp(xptmp->sname, sname))
183 int X509_PURPOSE_get_by_id(int purpose)
187 if ((purpose >= X509_PURPOSE_MIN) && (purpose <= X509_PURPOSE_MAX))
188 return purpose - X509_PURPOSE_MIN;
189 tmp.purpose = purpose;
192 idx = sk_X509_PURPOSE_find(xptable, &tmp);
195 return idx + X509_PURPOSE_COUNT;
198 int X509_PURPOSE_add(int id, int trust, int flags,
199 int (*ck) (const X509_PURPOSE *, const X509 *, int),
200 char *name, char *sname, void *arg)
205 * This is set according to what we change: application can't set it
207 flags &= ~X509_PURPOSE_DYNAMIC;
208 /* This will always be set for application modified trust entries */
209 flags |= X509_PURPOSE_DYNAMIC_NAME;
210 /* Get existing entry if any */
211 idx = X509_PURPOSE_get_by_id(id);
212 /* Need a new entry */
214 if (!(ptmp = OPENSSL_malloc(sizeof(X509_PURPOSE)))) {
215 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
218 ptmp->flags = X509_PURPOSE_DYNAMIC;
220 ptmp = X509_PURPOSE_get0(idx);
222 /* OPENSSL_free existing name if dynamic */
223 if (ptmp->flags & X509_PURPOSE_DYNAMIC_NAME) {
224 OPENSSL_free(ptmp->name);
225 OPENSSL_free(ptmp->sname);
227 /* dup supplied name */
228 ptmp->name = BUF_strdup(name);
229 ptmp->sname = BUF_strdup(sname);
230 if (!ptmp->name || !ptmp->sname) {
231 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
234 /* Keep the dynamic flag of existing entry */
235 ptmp->flags &= X509_PURPOSE_DYNAMIC;
236 /* Set all other flags */
237 ptmp->flags |= flags;
241 ptmp->check_purpose = ck;
242 ptmp->usr_data = arg;
244 /* If its a new entry manage the dynamic table */
246 if (!xptable && !(xptable = sk_X509_PURPOSE_new(xp_cmp))) {
247 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
250 if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
251 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
258 static void xptable_free(X509_PURPOSE *p)
262 if (p->flags & X509_PURPOSE_DYNAMIC) {
263 if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
264 OPENSSL_free(p->name);
265 OPENSSL_free(p->sname);
271 void X509_PURPOSE_cleanup(void)
274 sk_X509_PURPOSE_pop_free(xptable, xptable_free);
275 for (i = 0; i < X509_PURPOSE_COUNT; i++)
276 xptable_free(xstandard + i);
280 int X509_PURPOSE_get_id(X509_PURPOSE *xp)
285 char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
290 char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
295 int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
300 static int nid_cmp(const int *a, const int *b)
305 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
306 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
308 int X509_supported_extension(X509_EXTENSION *ex)
311 * This table is a list of the NIDs of supported extensions: that is
312 * those which are used by the verify process. If an extension is
313 * critical and doesn't appear in this list then the verify process will
314 * normally reject the certificate. The list must be kept in numerical
315 * order because it will be searched using bsearch.
318 static const int supported_nids[] = {
319 NID_netscape_cert_type, /* 71 */
320 NID_key_usage, /* 83 */
321 NID_subject_alt_name, /* 85 */
322 NID_basic_constraints, /* 87 */
323 NID_certificate_policies, /* 89 */
324 NID_ext_key_usage, /* 126 */
325 NID_sbgp_ipAddrBlock, /* 290 */
326 NID_sbgp_autonomousSysNum, /* 291 */
327 NID_policy_constraints, /* 401 */
328 NID_proxyCertInfo, /* 663 */
329 NID_name_constraints, /* 666 */
330 NID_policy_mappings, /* 747 */
331 NID_inhibit_any_policy /* 748 */
334 int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
336 if (ex_nid == NID_undef)
339 if (OBJ_bsearch_nid(&ex_nid, supported_nids,
340 sizeof(supported_nids) / sizeof(int)))
345 static void setup_dp(X509 *x, DIST_POINT *dp)
347 X509_NAME *iname = NULL;
350 if (dp->reasons->length > 0)
351 dp->dp_reasons = dp->reasons->data[0];
352 if (dp->reasons->length > 1)
353 dp->dp_reasons |= (dp->reasons->data[1] << 8);
354 dp->dp_reasons &= CRLDP_ALL_REASONS;
356 dp->dp_reasons = CRLDP_ALL_REASONS;
357 if (!dp->distpoint || (dp->distpoint->type != 1))
359 for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
360 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
361 if (gen->type == GEN_DIRNAME) {
362 iname = gen->d.directoryName;
367 iname = X509_get_issuer_name(x);
369 DIST_POINT_set_dpname(dp->distpoint, iname);
373 static void setup_crldp(X509 *x)
376 x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
377 for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
378 setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
381 static void x509v3_cache_extensions(X509 *x)
383 BASIC_CONSTRAINTS *bs;
384 PROXY_CERT_INFO_EXTENSION *pci;
385 ASN1_BIT_STRING *usage;
387 EXTENDED_KEY_USAGE *extusage;
391 if (x->ex_flags & EXFLAG_SET)
393 #ifndef OPENSSL_NO_SHA
394 X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
396 /* V1 should mean no extensions ... */
397 if (!X509_get_version(x))
398 x->ex_flags |= EXFLAG_V1;
399 /* Handle basic constraints */
400 if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
402 x->ex_flags |= EXFLAG_CA;
404 if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
406 x->ex_flags |= EXFLAG_INVALID;
409 x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
412 BASIC_CONSTRAINTS_free(bs);
413 x->ex_flags |= EXFLAG_BCONS;
415 /* Handle proxy certificates */
416 if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
417 if (x->ex_flags & EXFLAG_CA
418 || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
419 || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
420 x->ex_flags |= EXFLAG_INVALID;
422 if (pci->pcPathLengthConstraint) {
423 x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
425 x->ex_pcpathlen = -1;
426 PROXY_CERT_INFO_EXTENSION_free(pci);
427 x->ex_flags |= EXFLAG_PROXY;
429 /* Handle key usage */
430 if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
431 if (usage->length > 0) {
432 x->ex_kusage = usage->data[0];
433 if (usage->length > 1)
434 x->ex_kusage |= usage->data[1] << 8;
437 x->ex_flags |= EXFLAG_KUSAGE;
438 ASN1_BIT_STRING_free(usage);
441 if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
442 x->ex_flags |= EXFLAG_XKUSAGE;
443 for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
444 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
445 case NID_server_auth:
446 x->ex_xkusage |= XKU_SSL_SERVER;
449 case NID_client_auth:
450 x->ex_xkusage |= XKU_SSL_CLIENT;
453 case NID_email_protect:
454 x->ex_xkusage |= XKU_SMIME;
458 x->ex_xkusage |= XKU_CODE_SIGN;
463 x->ex_xkusage |= XKU_SGC;
467 x->ex_xkusage |= XKU_OCSP_SIGN;
471 x->ex_xkusage |= XKU_TIMESTAMP;
475 x->ex_xkusage |= XKU_DVCS;
478 case NID_anyExtendedKeyUsage:
479 x->ex_xkusage |= XKU_ANYEKU;
483 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
486 if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
488 x->ex_nscert = ns->data[0];
491 x->ex_flags |= EXFLAG_NSCERT;
492 ASN1_BIT_STRING_free(ns);
494 x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
495 x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
496 /* Does subject name match issuer ? */
497 if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
498 x->ex_flags |= EXFLAG_SI;
499 /* If SKID matches AKID also indicate self signed */
500 if (X509_check_akid(x, x->akid) == X509_V_OK)
501 x->ex_flags |= EXFLAG_SS;
503 x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
504 x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
505 if (!x->nc && (i != -1))
506 x->ex_flags |= EXFLAG_INVALID;
509 x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
510 x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
512 for (i = 0; i < X509_get_ext_count(x); i++) {
513 ex = X509_get_ext(x, i);
514 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
516 x->ex_flags |= EXFLAG_FRESHEST;
517 if (!X509_EXTENSION_get_critical(ex))
519 if (!X509_supported_extension(ex)) {
520 x->ex_flags |= EXFLAG_CRITICAL;
524 x->ex_flags |= EXFLAG_SET;
528 * CA checks common to all purposes
532 * 2 basicConstraints absent so "maybe" a CA
533 * 3 basicConstraints absent but self signed V1.
534 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
537 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
538 #define ku_reject(x, usage) \
539 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
540 #define xku_reject(x, usage) \
541 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
542 #define ns_reject(x, usage) \
543 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
545 static int check_ca(const X509 *x)
547 /* keyUsage if present should allow cert signing */
548 if (ku_reject(x, KU_KEY_CERT_SIGN))
550 if (x->ex_flags & EXFLAG_BCONS) {
551 if (x->ex_flags & EXFLAG_CA)
553 /* If basicConstraints says not a CA then say so */
557 /* we support V1 roots for... uh, I don't really know why. */
558 if ((x->ex_flags & V1_ROOT) == V1_ROOT)
561 * If key usage present it must have certSign so tolerate it
563 else if (x->ex_flags & EXFLAG_KUSAGE)
565 /* Older certificates could have Netscape-specific CA types */
566 else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
568 /* can this still be regarded a CA certificate? I doubt it */
573 int X509_check_ca(X509 *x)
575 if (!(x->ex_flags & EXFLAG_SET)) {
576 CRYPTO_w_lock(CRYPTO_LOCK_X509);
577 x509v3_cache_extensions(x);
578 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
584 /* Check SSL CA: common checks for SSL client and server */
585 static int check_ssl_ca(const X509 *x)
588 ca_ret = check_ca(x);
591 /* check nsCertType if present */
592 if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
598 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
601 if (xku_reject(x, XKU_SSL_CLIENT))
604 return check_ssl_ca(x);
605 /* We need to do digital signatures or key agreement */
606 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
608 /* nsCertType if present should allow SSL client use */
609 if (ns_reject(x, NS_SSL_CLIENT))
615 * Key usage needed for TLS/SSL server: digital signature, encipherment or
616 * key agreement. The ssl code can check this more thoroughly for individual
620 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
622 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
625 if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
628 return check_ssl_ca(x);
630 if (ns_reject(x, NS_SSL_SERVER))
632 if (ku_reject(x, KU_TLS))
639 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
643 ret = check_purpose_ssl_server(xp, x, ca);
646 /* We need to encipher or Netscape complains */
647 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
652 /* common S/MIME checks */
653 static int purpose_smime(const X509 *x, int ca)
655 if (xku_reject(x, XKU_SMIME))
659 ca_ret = check_ca(x);
662 /* check nsCertType if present */
663 if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
668 if (x->ex_flags & EXFLAG_NSCERT) {
669 if (x->ex_nscert & NS_SMIME)
671 /* Workaround for some buggy certificates */
672 if (x->ex_nscert & NS_SSL_CLIENT)
679 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
683 ret = purpose_smime(x, ca);
686 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
691 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
695 ret = purpose_smime(x, ca);
698 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
703 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
708 if ((ca_ret = check_ca(x)) != 2)
713 if (ku_reject(x, KU_CRL_SIGN))
719 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
720 * is valid. Additional checks must be made on the chain.
723 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
726 * Must be a valid CA. Should we really support the "I don't know" value
731 /* leaf certificate is checked in OCSP_verify() */
735 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
740 /* If ca is true we must return if this is a valid CA certificate. */
745 * Check the optional key usage field:
746 * if Key Usage is present, it must be one of digitalSignature
747 * and/or nonRepudiation (other values are not consistent and shall
750 if ((x->ex_flags & EXFLAG_KUSAGE)
751 && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
752 !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
755 /* Only time stamp key usage is permitted and it's required. */
756 if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
759 /* Extended Key Usage MUST be critical */
760 i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1);
762 X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
763 if (!X509_EXTENSION_get_critical(ext))
770 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
776 * Various checks to see if one certificate issued the second.
777 * This can be used to prune a set of possible issuer certificates
778 * which have been looked up using some simple method such as by
781 * 1. Check issuer_name(subject) == subject_name(issuer)
782 * 2. If akid(subject) exists check it matches issuer
783 * 3. If key_usage(issuer) exists check it supports certificate signing
784 * returns 0 for OK, positive for reason for mismatch, reasons match
785 * codes for X509_verify_cert()
788 int X509_check_issued(X509 *issuer, X509 *subject)
790 if (X509_NAME_cmp(X509_get_subject_name(issuer),
791 X509_get_issuer_name(subject)))
792 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
793 x509v3_cache_extensions(issuer);
794 x509v3_cache_extensions(subject);
797 int ret = X509_check_akid(issuer, subject->akid);
798 if (ret != X509_V_OK)
802 if (subject->ex_flags & EXFLAG_PROXY) {
803 if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
804 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
805 } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
806 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
810 int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
816 /* Check key ids (if present) */
817 if (akid->keyid && issuer->skid &&
818 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
819 return X509_V_ERR_AKID_SKID_MISMATCH;
820 /* Check serial number */
822 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
823 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
824 /* Check issuer name */
827 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
828 * GeneralName. So look for a DirName. There may be more than one but
829 * we only take any notice of the first.
833 X509_NAME *nm = NULL;
836 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
837 gen = sk_GENERAL_NAME_value(gens, i);
838 if (gen->type == GEN_DIRNAME) {
843 if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
844 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;