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).
61 #include "internal/cryptlib.h"
62 #include "internal/numbers.h"
63 #include <openssl/x509v3.h>
64 #include <openssl/x509_vfy.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
);
137 idx
= X509_PURPOSE_get_by_id(id
);
140 pt
= X509_PURPOSE_get0(idx
);
141 return pt
->check_purpose(pt
, x
, ca
);
144 int X509_PURPOSE_set(int *p
, int purpose
)
146 if (X509_PURPOSE_get_by_id(purpose
) == -1) {
147 X509V3err(X509V3_F_X509_PURPOSE_SET
, X509V3_R_INVALID_PURPOSE
);
154 int X509_PURPOSE_get_count(void)
157 return X509_PURPOSE_COUNT
;
158 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
161 X509_PURPOSE
*X509_PURPOSE_get0(int idx
)
165 if (idx
< (int)X509_PURPOSE_COUNT
)
166 return xstandard
+ idx
;
167 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
170 int X509_PURPOSE_get_by_sname(char *sname
)
174 for (i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
175 xptmp
= X509_PURPOSE_get0(i
);
176 if (strcmp(xptmp
->sname
, sname
) == 0)
182 int X509_PURPOSE_get_by_id(int purpose
)
186 if ((purpose
>= X509_PURPOSE_MIN
) && (purpose
<= X509_PURPOSE_MAX
))
187 return purpose
- X509_PURPOSE_MIN
;
188 tmp
.purpose
= purpose
;
191 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
194 return idx
+ X509_PURPOSE_COUNT
;
197 int X509_PURPOSE_add(int id
, int trust
, int flags
,
198 int (*ck
) (const X509_PURPOSE
*, const X509
*, int),
199 char *name
, char *sname
, void *arg
)
204 * This is set according to what we change: application can't set it
206 flags
&= ~X509_PURPOSE_DYNAMIC
;
207 /* This will always be set for application modified trust entries */
208 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
209 /* Get existing entry if any */
210 idx
= X509_PURPOSE_get_by_id(id
);
211 /* Need a new entry */
213 if ((ptmp
= OPENSSL_malloc(sizeof(*ptmp
))) == NULL
) {
214 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
217 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
219 ptmp
= X509_PURPOSE_get0(idx
);
221 /* OPENSSL_free existing name if dynamic */
222 if (ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
223 OPENSSL_free(ptmp
->name
);
224 OPENSSL_free(ptmp
->sname
);
226 /* dup supplied name */
227 ptmp
->name
= BUF_strdup(name
);
228 ptmp
->sname
= BUF_strdup(sname
);
229 if (!ptmp
->name
|| !ptmp
->sname
) {
230 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
233 /* Keep the dynamic flag of existing entry */
234 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
235 /* Set all other flags */
236 ptmp
->flags
|= flags
;
240 ptmp
->check_purpose
= ck
;
241 ptmp
->usr_data
= arg
;
243 /* If its a new entry manage the dynamic table */
246 && (xptable
= sk_X509_PURPOSE_new(xp_cmp
)) == NULL
) {
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 #ifndef OPENSSL_NO_RFC3779
326 NID_sbgp_ipAddrBlock
, /* 290 */
327 NID_sbgp_autonomousSysNum
, /* 291 */
329 NID_policy_constraints
, /* 401 */
330 NID_proxyCertInfo
, /* 663 */
331 NID_name_constraints
, /* 666 */
332 NID_policy_mappings
, /* 747 */
333 NID_inhibit_any_policy
/* 748 */
336 int ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
338 if (ex_nid
== NID_undef
)
341 if (OBJ_bsearch_nid(&ex_nid
, supported_nids
, OSSL_NELEM(supported_nids
)))
346 static void setup_dp(X509
*x
, DIST_POINT
*dp
)
348 X509_NAME
*iname
= NULL
;
351 if (dp
->reasons
->length
> 0)
352 dp
->dp_reasons
= dp
->reasons
->data
[0];
353 if (dp
->reasons
->length
> 1)
354 dp
->dp_reasons
|= (dp
->reasons
->data
[1] << 8);
355 dp
->dp_reasons
&= CRLDP_ALL_REASONS
;
357 dp
->dp_reasons
= CRLDP_ALL_REASONS
;
358 if (!dp
->distpoint
|| (dp
->distpoint
->type
!= 1))
360 for (i
= 0; i
< sk_GENERAL_NAME_num(dp
->CRLissuer
); i
++) {
361 GENERAL_NAME
*gen
= sk_GENERAL_NAME_value(dp
->CRLissuer
, i
);
362 if (gen
->type
== GEN_DIRNAME
) {
363 iname
= gen
->d
.directoryName
;
368 iname
= X509_get_issuer_name(x
);
370 DIST_POINT_set_dpname(dp
->distpoint
, iname
);
374 static void setup_crldp(X509
*x
)
377 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, NULL
, NULL
);
378 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++)
379 setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
));
382 static void x509v3_cache_extensions(X509
*x
)
384 BASIC_CONSTRAINTS
*bs
;
385 PROXY_CERT_INFO_EXTENSION
*pci
;
386 ASN1_BIT_STRING
*usage
;
388 EXTENDED_KEY_USAGE
*extusage
;
392 if (x
->ex_flags
& EXFLAG_SET
)
394 X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
);
395 /* V1 should mean no extensions ... */
396 if (!X509_get_version(x
))
397 x
->ex_flags
|= EXFLAG_V1
;
398 /* Handle basic constraints */
399 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, NULL
, NULL
))) {
401 x
->ex_flags
|= EXFLAG_CA
;
403 if ((bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
)
405 x
->ex_flags
|= EXFLAG_INVALID
;
408 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
411 BASIC_CONSTRAINTS_free(bs
);
412 x
->ex_flags
|= EXFLAG_BCONS
;
414 /* Handle proxy certificates */
415 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, NULL
, NULL
))) {
416 if (x
->ex_flags
& EXFLAG_CA
417 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
418 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
419 x
->ex_flags
|= EXFLAG_INVALID
;
421 if (pci
->pcPathLengthConstraint
) {
422 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
424 x
->ex_pcpathlen
= -1;
425 PROXY_CERT_INFO_EXTENSION_free(pci
);
426 x
->ex_flags
|= EXFLAG_PROXY
;
428 /* Handle key usage */
429 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, NULL
, NULL
))) {
430 if (usage
->length
> 0) {
431 x
->ex_kusage
= usage
->data
[0];
432 if (usage
->length
> 1)
433 x
->ex_kusage
|= usage
->data
[1] << 8;
436 x
->ex_flags
|= EXFLAG_KUSAGE
;
437 ASN1_BIT_STRING_free(usage
);
440 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, NULL
, NULL
))) {
441 x
->ex_flags
|= EXFLAG_XKUSAGE
;
442 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
443 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
444 case NID_server_auth
:
445 x
->ex_xkusage
|= XKU_SSL_SERVER
;
448 case NID_client_auth
:
449 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
452 case NID_email_protect
:
453 x
->ex_xkusage
|= XKU_SMIME
;
457 x
->ex_xkusage
|= XKU_CODE_SIGN
;
462 x
->ex_xkusage
|= XKU_SGC
;
466 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
470 x
->ex_xkusage
|= XKU_TIMESTAMP
;
474 x
->ex_xkusage
|= XKU_DVCS
;
477 case NID_anyExtendedKeyUsage
:
478 x
->ex_xkusage
|= XKU_ANYEKU
;
482 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
485 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, NULL
, NULL
))) {
487 x
->ex_nscert
= ns
->data
[0];
490 x
->ex_flags
|= EXFLAG_NSCERT
;
491 ASN1_BIT_STRING_free(ns
);
493 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, NULL
, NULL
);
494 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, NULL
, NULL
);
495 /* Does subject name match issuer ? */
496 if (!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
))) {
497 x
->ex_flags
|= EXFLAG_SI
;
498 /* If SKID matches AKID also indicate self signed */
499 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
)
500 x
->ex_flags
|= EXFLAG_SS
;
502 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, NULL
, NULL
);
503 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
504 if (!x
->nc
&& (i
!= -1))
505 x
->ex_flags
|= EXFLAG_INVALID
;
508 #ifndef OPENSSL_NO_RFC3779
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
,
513 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
514 ex
= X509_get_ext(x
, i
);
515 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex
))
517 x
->ex_flags
|= EXFLAG_FRESHEST
;
518 if (!X509_EXTENSION_get_critical(ex
))
520 if (!X509_supported_extension(ex
)) {
521 x
->ex_flags
|= EXFLAG_CRITICAL
;
525 x
->ex_flags
|= EXFLAG_SET
;
529 * CA checks common to all purposes
533 * 2 basicConstraints absent so "maybe" a CA
534 * 3 basicConstraints absent but self signed V1.
535 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
538 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
539 #define ku_reject(x, usage) \
540 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
541 #define xku_reject(x, usage) \
542 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
543 #define ns_reject(x, usage) \
544 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
546 static int check_ca(const X509
*x
)
548 /* keyUsage if present should allow cert signing */
549 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
551 if (x
->ex_flags
& EXFLAG_BCONS
) {
552 if (x
->ex_flags
& EXFLAG_CA
)
554 /* If basicConstraints says not a CA then say so */
558 /* we support V1 roots for... uh, I don't really know why. */
559 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
562 * If key usage present it must have certSign so tolerate it
564 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
566 /* Older certificates could have Netscape-specific CA types */
567 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
569 /* can this still be regarded a CA certificate? I doubt it */
574 int X509_check_ca(X509
*x
)
576 if (!(x
->ex_flags
& EXFLAG_SET
)) {
577 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
578 x509v3_cache_extensions(x
);
579 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
585 /* Check SSL CA: common checks for SSL client and server */
586 static int check_ssl_ca(const X509
*x
)
589 ca_ret
= check_ca(x
);
592 /* check nsCertType if present */
593 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
)
599 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
602 if (xku_reject(x
, XKU_SSL_CLIENT
))
605 return check_ssl_ca(x
);
606 /* We need to do digital signatures or key agreement */
607 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
609 /* nsCertType if present should allow SSL client use */
610 if (ns_reject(x
, NS_SSL_CLIENT
))
616 * Key usage needed for TLS/SSL server: digital signature, encipherment or
617 * key agreement. The ssl code can check this more thoroughly for individual
621 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
623 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
626 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
629 return check_ssl_ca(x
);
631 if (ns_reject(x
, NS_SSL_SERVER
))
633 if (ku_reject(x
, KU_TLS
))
640 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
644 ret
= check_purpose_ssl_server(xp
, x
, ca
);
647 /* We need to encipher or Netscape complains */
648 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
653 /* common S/MIME checks */
654 static int purpose_smime(const X509
*x
, int ca
)
656 if (xku_reject(x
, XKU_SMIME
))
660 ca_ret
= check_ca(x
);
663 /* check nsCertType if present */
664 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
669 if (x
->ex_flags
& EXFLAG_NSCERT
) {
670 if (x
->ex_nscert
& NS_SMIME
)
672 /* Workaround for some buggy certificates */
673 if (x
->ex_nscert
& NS_SSL_CLIENT
)
680 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
684 ret
= purpose_smime(x
, ca
);
687 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
692 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
696 ret
= purpose_smime(x
, ca
);
699 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
704 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
709 if ((ca_ret
= check_ca(x
)) != 2)
714 if (ku_reject(x
, KU_CRL_SIGN
))
720 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
721 * is valid. Additional checks must be made on the chain.
724 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
727 * Must be a valid CA. Should we really support the "I don't know" value
732 /* leaf certificate is checked in OCSP_verify() */
736 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
741 /* If ca is true we must return if this is a valid CA certificate. */
746 * Check the optional key usage field:
747 * if Key Usage is present, it must be one of digitalSignature
748 * and/or nonRepudiation (other values are not consistent and shall
751 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
752 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
753 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
756 /* Only time stamp key usage is permitted and it's required. */
757 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
760 /* Extended Key Usage MUST be critical */
761 i_ext
= X509_get_ext_by_NID((X509
*)x
, NID_ext_key_usage
, -1);
763 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
764 if (!X509_EXTENSION_get_critical(ext
))
771 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
777 * Various checks to see if one certificate issued the second.
778 * This can be used to prune a set of possible issuer certificates
779 * which have been looked up using some simple method such as by
782 * 1. Check issuer_name(subject) == subject_name(issuer)
783 * 2. If akid(subject) exists check it matches issuer
784 * 3. If key_usage(issuer) exists check it supports certificate signing
785 * returns 0 for OK, positive for reason for mismatch, reasons match
786 * codes for X509_verify_cert()
789 int X509_check_issued(X509
*issuer
, X509
*subject
)
791 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
792 X509_get_issuer_name(subject
)))
793 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
794 x509v3_cache_extensions(issuer
);
795 x509v3_cache_extensions(subject
);
798 int ret
= X509_check_akid(issuer
, subject
->akid
);
799 if (ret
!= X509_V_OK
)
803 if (subject
->ex_flags
& EXFLAG_PROXY
) {
804 if (ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
805 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
806 } else if (ku_reject(issuer
, KU_KEY_CERT_SIGN
))
807 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
811 int X509_check_akid(X509
*issuer
, AUTHORITY_KEYID
*akid
)
817 /* Check key ids (if present) */
818 if (akid
->keyid
&& issuer
->skid
&&
819 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
))
820 return X509_V_ERR_AKID_SKID_MISMATCH
;
821 /* Check serial number */
823 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer
), akid
->serial
))
824 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
825 /* Check issuer name */
828 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
829 * GeneralName. So look for a DirName. There may be more than one but
830 * we only take any notice of the first.
834 X509_NAME
*nm
= NULL
;
837 for (i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++) {
838 gen
= sk_GENERAL_NAME_value(gens
, i
);
839 if (gen
->type
== GEN_DIRNAME
) {
844 if (nm
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)))
845 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
850 uint32_t X509_get_extension_flags(X509
*x
)
852 X509_check_purpose(x
, -1, -1);
856 uint32_t X509_get_key_usage(X509
*x
)
858 X509_check_purpose(x
, -1, -1);
859 if (x
->ex_flags
& EXFLAG_KUSAGE
)
864 uint32_t X509_get_extended_key_usage(X509
*x
)
866 X509_check_purpose(x
, -1, -1);
867 if (x
->ex_flags
& EXFLAG_XKUSAGE
)
868 return x
->ex_xkusage
;