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 X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
394 /* V1 should mean no extensions ... */
395 if (!X509_get_version(x))
396 x->ex_flags |= EXFLAG_V1;
397 /* Handle basic constraints */
398 if ((bs = X509_get_ext_d2i(x, NID_basic_constraints, NULL, NULL))) {
400 x->ex_flags |= EXFLAG_CA;
402 if ((bs->pathlen->type == V_ASN1_NEG_INTEGER)
404 x->ex_flags |= EXFLAG_INVALID;
407 x->ex_pathlen = ASN1_INTEGER_get(bs->pathlen);
410 BASIC_CONSTRAINTS_free(bs);
411 x->ex_flags |= EXFLAG_BCONS;
413 /* Handle proxy certificates */
414 if ((pci = X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
415 if (x->ex_flags & EXFLAG_CA
416 || X509_get_ext_by_NID(x, NID_subject_alt_name, -1) >= 0
417 || X509_get_ext_by_NID(x, NID_issuer_alt_name, -1) >= 0) {
418 x->ex_flags |= EXFLAG_INVALID;
420 if (pci->pcPathLengthConstraint) {
421 x->ex_pcpathlen = ASN1_INTEGER_get(pci->pcPathLengthConstraint);
423 x->ex_pcpathlen = -1;
424 PROXY_CERT_INFO_EXTENSION_free(pci);
425 x->ex_flags |= EXFLAG_PROXY;
427 /* Handle key usage */
428 if ((usage = X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
429 if (usage->length > 0) {
430 x->ex_kusage = usage->data[0];
431 if (usage->length > 1)
432 x->ex_kusage |= usage->data[1] << 8;
435 x->ex_flags |= EXFLAG_KUSAGE;
436 ASN1_BIT_STRING_free(usage);
439 if ((extusage = X509_get_ext_d2i(x, NID_ext_key_usage, NULL, NULL))) {
440 x->ex_flags |= EXFLAG_XKUSAGE;
441 for (i = 0; i < sk_ASN1_OBJECT_num(extusage); i++) {
442 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage, i))) {
443 case NID_server_auth:
444 x->ex_xkusage |= XKU_SSL_SERVER;
447 case NID_client_auth:
448 x->ex_xkusage |= XKU_SSL_CLIENT;
451 case NID_email_protect:
452 x->ex_xkusage |= XKU_SMIME;
456 x->ex_xkusage |= XKU_CODE_SIGN;
461 x->ex_xkusage |= XKU_SGC;
465 x->ex_xkusage |= XKU_OCSP_SIGN;
469 x->ex_xkusage |= XKU_TIMESTAMP;
473 x->ex_xkusage |= XKU_DVCS;
476 case NID_anyExtendedKeyUsage:
477 x->ex_xkusage |= XKU_ANYEKU;
481 sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
484 if ((ns = X509_get_ext_d2i(x, NID_netscape_cert_type, NULL, NULL))) {
486 x->ex_nscert = ns->data[0];
489 x->ex_flags |= EXFLAG_NSCERT;
490 ASN1_BIT_STRING_free(ns);
492 x->skid = X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
493 x->akid = X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
494 /* Does subject name match issuer ? */
495 if (!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x))) {
496 x->ex_flags |= EXFLAG_SI;
497 /* If SKID matches AKID also indicate self signed */
498 if (X509_check_akid(x, x->akid) == X509_V_OK)
499 x->ex_flags |= EXFLAG_SS;
501 x->altname = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
502 x->nc = X509_get_ext_d2i(x, NID_name_constraints, &i, NULL);
503 if (!x->nc && (i != -1))
504 x->ex_flags |= EXFLAG_INVALID;
507 x->rfc3779_addr = X509_get_ext_d2i(x, NID_sbgp_ipAddrBlock, NULL, NULL);
508 x->rfc3779_asid = X509_get_ext_d2i(x, NID_sbgp_autonomousSysNum,
510 for (i = 0; i < X509_get_ext_count(x); i++) {
511 ex = X509_get_ext(x, i);
512 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex))
514 x->ex_flags |= EXFLAG_FRESHEST;
515 if (!X509_EXTENSION_get_critical(ex))
517 if (!X509_supported_extension(ex)) {
518 x->ex_flags |= EXFLAG_CRITICAL;
522 x->ex_flags |= EXFLAG_SET;
526 * CA checks common to all purposes
530 * 2 basicConstraints absent so "maybe" a CA
531 * 3 basicConstraints absent but self signed V1.
532 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
535 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
536 #define ku_reject(x, usage) \
537 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
538 #define xku_reject(x, usage) \
539 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
540 #define ns_reject(x, usage) \
541 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
543 static int check_ca(const X509 *x)
545 /* keyUsage if present should allow cert signing */
546 if (ku_reject(x, KU_KEY_CERT_SIGN))
548 if (x->ex_flags & EXFLAG_BCONS) {
549 if (x->ex_flags & EXFLAG_CA)
551 /* If basicConstraints says not a CA then say so */
555 /* we support V1 roots for... uh, I don't really know why. */
556 if ((x->ex_flags & V1_ROOT) == V1_ROOT)
559 * If key usage present it must have certSign so tolerate it
561 else if (x->ex_flags & EXFLAG_KUSAGE)
563 /* Older certificates could have Netscape-specific CA types */
564 else if (x->ex_flags & EXFLAG_NSCERT && x->ex_nscert & NS_ANY_CA)
566 /* can this still be regarded a CA certificate? I doubt it */
571 int X509_check_ca(X509 *x)
573 if (!(x->ex_flags & EXFLAG_SET)) {
574 CRYPTO_w_lock(CRYPTO_LOCK_X509);
575 x509v3_cache_extensions(x);
576 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
582 /* Check SSL CA: common checks for SSL client and server */
583 static int check_ssl_ca(const X509 *x)
586 ca_ret = check_ca(x);
589 /* check nsCertType if present */
590 if (ca_ret != 5 || x->ex_nscert & NS_SSL_CA)
596 static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x,
599 if (xku_reject(x, XKU_SSL_CLIENT))
602 return check_ssl_ca(x);
603 /* We need to do digital signatures or key agreement */
604 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_KEY_AGREEMENT))
606 /* nsCertType if present should allow SSL client use */
607 if (ns_reject(x, NS_SSL_CLIENT))
613 * Key usage needed for TLS/SSL server: digital signature, encipherment or
614 * key agreement. The ssl code can check this more thoroughly for individual
618 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
620 static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x,
623 if (xku_reject(x, XKU_SSL_SERVER | XKU_SGC))
626 return check_ssl_ca(x);
628 if (ns_reject(x, NS_SSL_SERVER))
630 if (ku_reject(x, KU_TLS))
637 static int check_purpose_ns_ssl_server(const X509_PURPOSE *xp, const X509 *x,
641 ret = check_purpose_ssl_server(xp, x, ca);
644 /* We need to encipher or Netscape complains */
645 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
650 /* common S/MIME checks */
651 static int purpose_smime(const X509 *x, int ca)
653 if (xku_reject(x, XKU_SMIME))
657 ca_ret = check_ca(x);
660 /* check nsCertType if present */
661 if (ca_ret != 5 || x->ex_nscert & NS_SMIME_CA)
666 if (x->ex_flags & EXFLAG_NSCERT) {
667 if (x->ex_nscert & NS_SMIME)
669 /* Workaround for some buggy certificates */
670 if (x->ex_nscert & NS_SSL_CLIENT)
677 static int check_purpose_smime_sign(const X509_PURPOSE *xp, const X509 *x,
681 ret = purpose_smime(x, ca);
684 if (ku_reject(x, KU_DIGITAL_SIGNATURE | KU_NON_REPUDIATION))
689 static int check_purpose_smime_encrypt(const X509_PURPOSE *xp, const X509 *x,
693 ret = purpose_smime(x, ca);
696 if (ku_reject(x, KU_KEY_ENCIPHERMENT))
701 static int check_purpose_crl_sign(const X509_PURPOSE *xp, const X509 *x,
706 if ((ca_ret = check_ca(x)) != 2)
711 if (ku_reject(x, KU_CRL_SIGN))
717 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
718 * is valid. Additional checks must be made on the chain.
721 static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
724 * Must be a valid CA. Should we really support the "I don't know" value
729 /* leaf certificate is checked in OCSP_verify() */
733 static int check_purpose_timestamp_sign(const X509_PURPOSE *xp, const X509 *x,
738 /* If ca is true we must return if this is a valid CA certificate. */
743 * Check the optional key usage field:
744 * if Key Usage is present, it must be one of digitalSignature
745 * and/or nonRepudiation (other values are not consistent and shall
748 if ((x->ex_flags & EXFLAG_KUSAGE)
749 && ((x->ex_kusage & ~(KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE)) ||
750 !(x->ex_kusage & (KU_NON_REPUDIATION | KU_DIGITAL_SIGNATURE))))
753 /* Only time stamp key usage is permitted and it's required. */
754 if (!(x->ex_flags & EXFLAG_XKUSAGE) || x->ex_xkusage != XKU_TIMESTAMP)
757 /* Extended Key Usage MUST be critical */
758 i_ext = X509_get_ext_by_NID((X509 *)x, NID_ext_key_usage, -1);
760 X509_EXTENSION *ext = X509_get_ext((X509 *)x, i_ext);
761 if (!X509_EXTENSION_get_critical(ext))
768 static int no_check(const X509_PURPOSE *xp, const X509 *x, int ca)
774 * Various checks to see if one certificate issued the second.
775 * This can be used to prune a set of possible issuer certificates
776 * which have been looked up using some simple method such as by
779 * 1. Check issuer_name(subject) == subject_name(issuer)
780 * 2. If akid(subject) exists check it matches issuer
781 * 3. If key_usage(issuer) exists check it supports certificate signing
782 * returns 0 for OK, positive for reason for mismatch, reasons match
783 * codes for X509_verify_cert()
786 int X509_check_issued(X509 *issuer, X509 *subject)
788 if (X509_NAME_cmp(X509_get_subject_name(issuer),
789 X509_get_issuer_name(subject)))
790 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
791 x509v3_cache_extensions(issuer);
792 x509v3_cache_extensions(subject);
795 int ret = X509_check_akid(issuer, subject->akid);
796 if (ret != X509_V_OK)
800 if (subject->ex_flags & EXFLAG_PROXY) {
801 if (ku_reject(issuer, KU_DIGITAL_SIGNATURE))
802 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
803 } else if (ku_reject(issuer, KU_KEY_CERT_SIGN))
804 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
808 int X509_check_akid(X509 *issuer, AUTHORITY_KEYID *akid)
814 /* Check key ids (if present) */
815 if (akid->keyid && issuer->skid &&
816 ASN1_OCTET_STRING_cmp(akid->keyid, issuer->skid))
817 return X509_V_ERR_AKID_SKID_MISMATCH;
818 /* Check serial number */
820 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer), akid->serial))
821 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
822 /* Check issuer name */
825 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
826 * GeneralName. So look for a DirName. There may be more than one but
827 * we only take any notice of the first.
831 X509_NAME *nm = NULL;
834 for (i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
835 gen = sk_GENERAL_NAME_value(gens, i);
836 if (gen->type == GEN_DIRNAME) {
841 if (nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
842 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;