2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
60 #include "internal/cryptlib.h"
61 #include "internal/numbers.h"
62 #include <openssl/x509v3.h>
63 #include <openssl/x509_vfy.h>
64 #include "internal/x509_int.h"
66 static void x509v3_cache_extensions(X509 *x);
68 static int check_ssl_ca(const X509 *x);
69 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
71 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
73 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
75 static int purpose_smime(const X509 *x, int ca);
76 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
78 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
80 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
82 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
84 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca);
85 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca);
87 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b);
88 static void xptable_free(X509_PURPOSE *p);
90 static X509_PURPOSE xstandard[] = {
91 {X509_PURPOSE_SSL_CLIENT, X509_TRUST_SSL_CLIENT, 0,
92 check_purpose_ssl_client, "SSL client", "sslclient", NULL},
93 {X509_PURPOSE_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
94 check_purpose_ssl_server, "SSL server", "sslserver", NULL},
95 {X509_PURPOSE_NS_SSL_SERVER, X509_TRUST_SSL_SERVER, 0,
96 check_purpose_ns_ssl_server, "Netscape SSL server", "nssslserver", NULL},
97 {X509_PURPOSE_SMIME_SIGN, X509_TRUST_EMAIL, 0, check_purpose_smime_sign,
98 "S/MIME signing", "smimesign", NULL},
99 {X509_PURPOSE_SMIME_ENCRYPT, X509_TRUST_EMAIL, 0,
100 check_purpose_smime_encrypt, "S/MIME encryption", "smimeencrypt", NULL},
101 {X509_PURPOSE_CRL_SIGN, X509_TRUST_COMPAT, 0, check_purpose_crl_sign,
102 "CRL signing", "crlsign", NULL},
103 {X509_PURPOSE_ANY, X509_TRUST_DEFAULT, 0, no_check, "Any Purpose", "any",
105 {X509_PURPOSE_OCSP_HELPER, X509_TRUST_COMPAT, 0, ocsp_helper,
106 "OCSP helper", "ocsphelper", NULL},
107 {X509_PURPOSE_TIMESTAMP_SIGN, X509_TRUST_TSA, 0,
108 check_purpose_timestamp_sign, "Time Stamp signing", "timestampsign",
112 #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
114 static STACK_OF(X509_PURPOSE) *xptable = NULL;
116 static int xp_cmp(const X509_PURPOSE *const *a, const X509_PURPOSE *const *b)
118 return (*a)->purpose - (*b)->purpose;
122 * As much as I'd like to make X509_check_purpose use a "const" X509* I
123 * really can't because it does recalculate hashes and do other non-const
126 int X509_check_purpose(X509 *x, int id, int ca)
129 const X509_PURPOSE *pt;
130 if (!(x->ex_flags & EXFLAG_SET)) {
131 CRYPTO_w_lock(CRYPTO_LOCK_X509);
132 x509v3_cache_extensions(x);
133 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
135 /* Return if side-effect only call */
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) == 0)
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(*ptmp))) == NULL) {
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 = OPENSSL_strdup(name);
229 ptmp->sname = OPENSSL_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 */
247 && (xptable = sk_X509_PURPOSE_new(xp_cmp)) == NULL) {
248 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
251 if (!sk_X509_PURPOSE_push(xptable, ptmp)) {
252 X509V3err(X509V3_F_X509_PURPOSE_ADD, ERR_R_MALLOC_FAILURE);
259 static void xptable_free(X509_PURPOSE *p)
263 if (p->flags & X509_PURPOSE_DYNAMIC) {
264 if (p->flags & X509_PURPOSE_DYNAMIC_NAME) {
265 OPENSSL_free(p->name);
266 OPENSSL_free(p->sname);
272 void X509_PURPOSE_cleanup(void)
275 sk_X509_PURPOSE_pop_free(xptable, xptable_free);
276 for (i = 0; i < X509_PURPOSE_COUNT; i++)
277 xptable_free(xstandard + i);
281 int X509_PURPOSE_get_id(X509_PURPOSE *xp)
286 char *X509_PURPOSE_get0_name(X509_PURPOSE *xp)
291 char *X509_PURPOSE_get0_sname(X509_PURPOSE *xp)
296 int X509_PURPOSE_get_trust(X509_PURPOSE *xp)
301 static int nid_cmp(const int *a, const int *b)
306 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid);
307 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid);
309 int X509_supported_extension(X509_EXTENSION *ex)
312 * This table is a list of the NIDs of supported extensions: that is
313 * those which are used by the verify process. If an extension is
314 * critical and doesn't appear in this list then the verify process will
315 * normally reject the certificate. The list must be kept in numerical
316 * order because it will be searched using bsearch.
319 static const int supported_nids[] = {
320 NID_netscape_cert_type, /* 71 */
321 NID_key_usage, /* 83 */
322 NID_subject_alt_name, /* 85 */
323 NID_basic_constraints, /* 87 */
324 NID_certificate_policies, /* 89 */
325 NID_ext_key_usage, /* 126 */
326 #ifndef OPENSSL_NO_RFC3779
327 NID_sbgp_ipAddrBlock, /* 290 */
328 NID_sbgp_autonomousSysNum, /* 291 */
330 NID_policy_constraints, /* 401 */
331 NID_proxyCertInfo, /* 663 */
332 NID_name_constraints, /* 666 */
333 NID_policy_mappings, /* 747 */
334 NID_inhibit_any_policy /* 748 */
337 int ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
339 if (ex_nid == NID_undef)
342 if (OBJ_bsearch_nid(&ex_nid, supported_nids, OSSL_NELEM(supported_nids)))
347 static void setup_dp(X509 *x, DIST_POINT *dp)
349 X509_NAME *iname = NULL;
352 if (dp->reasons->length > 0)
353 dp->dp_reasons = dp->reasons->data[0];
354 if (dp->reasons->length > 1)
355 dp->dp_reasons |= (dp->reasons->data[1] << 8);
356 dp->dp_reasons &= CRLDP_ALL_REASONS;
358 dp->dp_reasons = CRLDP_ALL_REASONS;
359 if (!dp->distpoint || (dp->distpoint->type != 1))
361 for (i = 0; i < sk_GENERAL_NAME_num(dp->CRLissuer); i++) {
362 GENERAL_NAME *gen = sk_GENERAL_NAME_value(dp->CRLissuer, i);
363 if (gen->type == GEN_DIRNAME) {
364 iname = gen->d.directoryName;
369 iname = X509_get_issuer_name(x);
371 DIST_POINT_set_dpname(dp->distpoint, iname);
375 static void setup_crldp(X509 *x)
378 x->crldp = X509_get_ext_d2i(x, NID_crl_distribution_points, NULL, NULL);
379 for (i = 0; i < sk_DIST_POINT_num(x->crldp); i++)
380 setup_dp(x, sk_DIST_POINT_value(x->crldp, i));
383 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
384 #define ku_reject(x, usage) \
385 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
386 #define xku_reject(x, usage) \
387 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
388 #define ns_reject(x, usage) \
389 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
391 static void x509v3_cache_extensions(X509 *x)
393 BASIC_CONSTRAINTS *bs;
394 PROXY_CERT_INFO_EXTENSION *pci;
395 ASN1_BIT_STRING *usage;
397 EXTENDED_KEY_USAGE *extusage;
401 if (x->ex_flags & EXFLAG_SET)
403 X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
404 /* V1 should mean no extensions ... */
405 if (!X509_get_version(x))
406 x->ex_flags |= EXFLAG_V1;
407 /* Handle basic constraints */
408 if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
410 x->ex_flags |= EXFLAG_CA;
412 if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
414 x->ex_flags |= EXFLAG_INVALID;
417 x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
420 BASIC_CONSTRAINTS_free(bs);
421 x->ex_flags |= EXFLAG_BCONS;
423 /* Handle proxy certificates */
424 if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
425 if (x->ex_flags & EXFLAG_CA
426 || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
427 || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
428 x->ex_flags |= EXFLAG_INVALID;
430 if (pci->pcPathLengthConstraint) {
431 x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
433 x->ex_pcpathlen = -1;
434 PROXY_CERT_INFO_EXTENSION_free(pci);
435 x->ex_flags |= EXFLAG_PROXY;
437 /* Handle key usage */
438 if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
439 if (usage->length > 0) {
440 x->ex_kusage = usage->data[0];
441 if (usage->length > 1)
442 x->ex_kusage |= usage->data[1] << 8;
445 x->ex_flags |= EXFLAG_KUSAGE;
446 ASN1_BIT_STRING_free(usage);
449 if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
450 x->ex_flags |= EXFLAG_XKUSAGE;
451 for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
452 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
453 case NID_server_auth:
454 x->ex_xkusage |= XKU_SSL_SERVER;
457 case NID_client_auth:
458 x->ex_xkusage |= XKU_SSL_CLIENT;
461 case NID_email_protect:
462 x->ex_xkusage |= XKU_SMIME;
466 x->ex_xkusage |= XKU_CODE_SIGN;
471 x->ex_xkusage |= XKU_SGC;
475 x->ex_xkusage |= XKU_OCSP_SIGN;
479 x->ex_xkusage |= XKU_TIMESTAMP;
483 x->ex_xkusage |= XKU_DVCS;
486 case NID_anyExtendedKeyUsage:
487 x->ex_xkusage |= XKU_ANYEKU;
491 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
494 if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
496 x->ex_nscert = ns->data[0];
499 x->ex_flags |= EXFLAG_NSCERT;
500 ASN1_BIT_STRING_free(ns);
502 x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
503 x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
504 /* Does subject name match issuer ? */
505 if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
506 x->ex_flags |= EXFLAG_SI;
507 /* If SKID matches AKID also indicate self signed */
508 if (X509_check_akid(x, x->akid) == X509_V_OK &&
509 !ku_reject(x, KU_KEY_CERT_SIGN))
510 x->ex_flags |= EXFLAG_SS;
512 x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
513 x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
514 if (!x->nc && (i != -1))
515 x->ex_flags |= EXFLAG_INVALID;
518 #ifndef OPENSSL_NO_RFC3779
519 x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
520 x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
523 for (i = 0; i < X509_get_ext_count(x); i++) {
524 ex = X509_get_ext(x, i);
525 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
527 x->ex_flags |= EXFLAG_FRESHEST;
528 if (!X509_EXTENSION_get_critical(ex))
530 if (!X509_supported_extension(ex)) {
531 x->ex_flags |= EXFLAG_CRITICAL;
535 x->ex_flags |= EXFLAG_SET;
539 * CA checks common to all purposes
543 * 2 basicConstraints absent so "maybe" a CA
544 * 3 basicConstraints absent but self signed V1.
545 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
548 static int check_ca(const X509 *x)
550 /* keyUsage if present should allow cert signing */
551 if (ku_reject(x, KU_KEY_CERT_SIGN))
553 if (x->ex_flags & EXFLAG_BCONS) {
554 if (x->ex_flags & EXFLAG_CA)
556 /* If basicConstraints says not a CA then say so */
560 /* we support V1 roots for... uh, I don't really know why. */
561 if ((x->ex_flags & V1_ROOT) == V1_ROOT)
564 * If key usage present it must have certSign so tolerate it
566 else if (x->ex_flags & EXFLAG_KUSAGE)
568 /* Older certificates could have Netscape-specific CA types */
569 else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
571 /* can this still be regarded a CA certificate? I doubt it */
576 int X509_check_ca(X509 *x)
578 if (!(x->ex_flags & EXFLAG_SET)) {
579 CRYPTO_w_lock(CRYPTO_LOCK_X509);
580 x509v3_cache_extensions(x);
581 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
587 /* Check SSL CA: common checks for SSL client and server */
588 static int check_ssl_ca(const X509 *x)
591 ca_ret = check_ca(x);
594 /* check nsCertType if present */
595 if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
601 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
604 if (xku_reject(x, XKU_SSL_CLIENT))
607 return check_ssl_ca(x);
608 /* We need to do digital signatures or key agreement */
609 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
611 /* nsCertType if present should allow SSL client use */
612 if (ns_reject(x, NS_SSL_CLIENT))
618 * Key usage needed for TLS/SSL server: digital signature, encipherment or
619 * key agreement. The ssl code can check this more thoroughly for individual
623 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
625 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
628 if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
631 return check_ssl_ca(x);
633 if (ns_reject(x, NS_SSL_SERVER))
635 if (ku_reject(x, KU_TLS))
642 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
646 ret = check_purpose_ssl_server(xp, x, ca);
649 /* We need to encipher or Netscape complains */
650 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
655 /* common S/MIME checks */
656 static int purpose_smime(const X509 *x, int ca)
658 if (xku_reject(x, XKU_SMIME))
662 ca_ret = check_ca(x);
665 /* check nsCertType if present */
666 if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
671 if (x->ex_flags & EXFLAG_NSCERT) {
672 if (x->ex_nscert & NS_SMIME)
674 /* Workaround for some buggy certificates */
675 if (x->ex_nscert & NS_SSL_CLIENT)
682 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
686 ret = purpose_smime(x, ca);
689 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
694 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
698 ret = purpose_smime(x, ca);
701 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
706 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
711 if ((ca_ret = check_ca(x)) != 2)
716 if (ku_reject(x, KU_CRL_SIGN))
722 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
723 * is valid. Additional checks must be made on the chain.
726 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
729 * Must be a valid CA. Should we really support the "I don't know" value
734 /* leaf certificate is checked in OCSP_verify() */
738 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
743 /* If ca is true we must return if this is a valid CA certificate. */
748 * Check the optional key usage field:
749 * if Key Usage is present, it must be one of digitalSignature
750 * and/or nonRepudiation (other values are not consistent and shall
753 if ((x->ex_flags & EXFLAG_KUSAGE)
754 && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
755 !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
758 /* Only time stamp key usage is permitted and it's required. */
759 if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
762 /* Extended Key Usage MUST be critical */
763 i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1);
765 X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
766 if (!X509_EXTENSION_get_critical(ext))
773 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
779 * Various checks to see if one certificate issued the second.
780 * This can be used to prune a set of possible issuer certificates
781 * which have been looked up using some simple method such as by
784 * 1. Check issuer_name(subject) == subject_name(issuer)
785 * 2. If akid(subject) exists check it matches issuer
786 * 3. If key_usage(issuer) exists check it supports certificate signing
787 * returns 0 for OK, positive for reason for mismatch, reasons match
788 * codes for X509_verify_cert()
791 int X509_check_issued(X509 *issuer, X509 *subject)
793 if (X509_NAME_cmp(X509_get_subject_name(issuer),
794 X509_get_issuer_name(subject)))
795 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
796 x509v3_cache_extensions(issuer);
797 x509v3_cache_extensions(subject);
800 int ret = X509_check_akid(issuer, subject->akid);
801 if (ret != X509_V_OK)
805 if (subject->ex_flags & EXFLAG_PROXY) {
806 if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
807 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
808 } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
809 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
813 int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
819 /* Check key ids (if present) */
820 if (akid->keyid && issuer->skid &&
821 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
822 return X509_V_ERR_AKID_SKID_MISMATCH;
823 /* Check serial number */
825 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
826 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
827 /* Check issuer name */
830 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
831 * GeneralName. So look for a DirName. There may be more than one but
832 * we only take any notice of the first.
836 X509_NAME *nm = NULL;
839 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
840 gen = sk_GENERAL_NAME_value(gens, i);
841 if (gen->type == GEN_DIRNAME) {
846 if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
847 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
852 uint32_t X509_get_extension_flags(X509 *x)
854 /* Call for side-effect of computing hash and caching extensions */
855 X509_check_purpose(x, -1, -1);
859 uint32_t X509_get_key_usage(X509 *x)
861 /* Call for side-effect of computing hash and caching extensions */
862 X509_check_purpose(x, -1, -1);
863 if (x->ex_flags & EXFLAG_KUSAGE)
868 uint32_t X509_get_extended_key_usage(X509 *x)
870 /* Call for side-effect of computing hash and caching extensions */
871 X509_check_purpose(x, -1, -1);
872 if (x->ex_flags & EXFLAG_XKUSAGE)
873 return x->ex_xkusage;
877 const ASN1_OCTET_STRING *X509_get0_subject_key_id(X509 *x)
879 /* Call for side-effect of computing hash and caching extensions */
880 X509_check_purpose(x, -1, -1);