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 #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
,
342 sizeof(supported_nids
) / sizeof(int)))
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 #ifndef OPENSSL_NO_SHA
404 X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
);
406 /* V1 should mean no extensions ... */
407 if (!X509_get_version(x
))
408 x
->ex_flags
|= EXFLAG_V1
;
409 /* Handle basic constraints */
410 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, NULL
, NULL
))) {
412 x
->ex_flags
|= EXFLAG_CA
;
414 if ((bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
)
416 x
->ex_flags
|= EXFLAG_INVALID
;
419 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
422 BASIC_CONSTRAINTS_free(bs
);
423 x
->ex_flags
|= EXFLAG_BCONS
;
425 /* Handle proxy certificates */
426 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, NULL
, NULL
))) {
427 if (x
->ex_flags
& EXFLAG_CA
428 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
429 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
430 x
->ex_flags
|= EXFLAG_INVALID
;
432 if (pci
->pcPathLengthConstraint
) {
433 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
435 x
->ex_pcpathlen
= -1;
436 PROXY_CERT_INFO_EXTENSION_free(pci
);
437 x
->ex_flags
|= EXFLAG_PROXY
;
439 /* Handle key usage */
440 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, NULL
, NULL
))) {
441 if (usage
->length
> 0) {
442 x
->ex_kusage
= usage
->data
[0];
443 if (usage
->length
> 1)
444 x
->ex_kusage
|= usage
->data
[1] << 8;
447 x
->ex_flags
|= EXFLAG_KUSAGE
;
448 ASN1_BIT_STRING_free(usage
);
451 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, NULL
, NULL
))) {
452 x
->ex_flags
|= EXFLAG_XKUSAGE
;
453 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
454 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
455 case NID_server_auth
:
456 x
->ex_xkusage
|= XKU_SSL_SERVER
;
459 case NID_client_auth
:
460 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
463 case NID_email_protect
:
464 x
->ex_xkusage
|= XKU_SMIME
;
468 x
->ex_xkusage
|= XKU_CODE_SIGN
;
473 x
->ex_xkusage
|= XKU_SGC
;
477 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
481 x
->ex_xkusage
|= XKU_TIMESTAMP
;
485 x
->ex_xkusage
|= XKU_DVCS
;
488 case NID_anyExtendedKeyUsage
:
489 x
->ex_xkusage
|= XKU_ANYEKU
;
493 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
496 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, NULL
, NULL
))) {
498 x
->ex_nscert
= ns
->data
[0];
501 x
->ex_flags
|= EXFLAG_NSCERT
;
502 ASN1_BIT_STRING_free(ns
);
504 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, NULL
, NULL
);
505 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, NULL
, NULL
);
506 /* Does subject name match issuer ? */
507 if (!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
))) {
508 x
->ex_flags
|= EXFLAG_SI
;
509 /* If SKID matches AKID also indicate self signed */
510 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
&&
511 !ku_reject(x
, KU_KEY_CERT_SIGN
))
512 x
->ex_flags
|= EXFLAG_SS
;
514 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, NULL
, NULL
);
515 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
516 if (!x
->nc
&& (i
!= -1))
517 x
->ex_flags
|= EXFLAG_INVALID
;
520 #ifndef OPENSSL_NO_RFC3779
521 x
->rfc3779_addr
= X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, NULL
, NULL
);
522 x
->rfc3779_asid
= X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
,
525 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
526 ex
= X509_get_ext(x
, i
);
527 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex
))
529 x
->ex_flags
|= EXFLAG_FRESHEST
;
530 if (!X509_EXTENSION_get_critical(ex
))
532 if (!X509_supported_extension(ex
)) {
533 x
->ex_flags
|= EXFLAG_CRITICAL
;
537 x
->ex_flags
|= EXFLAG_SET
;
541 * CA checks common to all purposes
545 * 2 basicConstraints absent so "maybe" a CA
546 * 3 basicConstraints absent but self signed V1.
547 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
550 static int check_ca(const X509
*x
)
552 /* keyUsage if present should allow cert signing */
553 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
555 if (x
->ex_flags
& EXFLAG_BCONS
) {
556 if (x
->ex_flags
& EXFLAG_CA
)
558 /* If basicConstraints says not a CA then say so */
562 /* we support V1 roots for... uh, I don't really know why. */
563 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
566 * If key usage present it must have certSign so tolerate it
568 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
570 /* Older certificates could have Netscape-specific CA types */
571 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
573 /* can this still be regarded a CA certificate? I doubt it */
578 int X509_check_ca(X509
*x
)
580 if (!(x
->ex_flags
& EXFLAG_SET
)) {
581 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
582 x509v3_cache_extensions(x
);
583 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
589 /* Check SSL CA: common checks for SSL client and server */
590 static int check_ssl_ca(const X509
*x
)
593 ca_ret
= check_ca(x
);
596 /* check nsCertType if present */
597 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
)
603 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
606 if (xku_reject(x
, XKU_SSL_CLIENT
))
609 return check_ssl_ca(x
);
610 /* We need to do digital signatures or key agreement */
611 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
613 /* nsCertType if present should allow SSL client use */
614 if (ns_reject(x
, NS_SSL_CLIENT
))
620 * Key usage needed for TLS/SSL server: digital signature, encipherment or
621 * key agreement. The ssl code can check this more thoroughly for individual
625 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
627 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
630 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
633 return check_ssl_ca(x
);
635 if (ns_reject(x
, NS_SSL_SERVER
))
637 if (ku_reject(x
, KU_TLS
))
644 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
648 ret
= check_purpose_ssl_server(xp
, x
, ca
);
651 /* We need to encipher or Netscape complains */
652 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
657 /* common S/MIME checks */
658 static int purpose_smime(const X509
*x
, int ca
)
660 if (xku_reject(x
, XKU_SMIME
))
664 ca_ret
= check_ca(x
);
667 /* check nsCertType if present */
668 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
673 if (x
->ex_flags
& EXFLAG_NSCERT
) {
674 if (x
->ex_nscert
& NS_SMIME
)
676 /* Workaround for some buggy certificates */
677 if (x
->ex_nscert
& NS_SSL_CLIENT
)
684 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
688 ret
= purpose_smime(x
, ca
);
691 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
696 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
700 ret
= purpose_smime(x
, ca
);
703 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
708 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
713 if ((ca_ret
= check_ca(x
)) != 2)
718 if (ku_reject(x
, KU_CRL_SIGN
))
724 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
725 * is valid. Additional checks must be made on the chain.
728 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
731 * Must be a valid CA. Should we really support the "I don't know" value
736 /* leaf certificate is checked in OCSP_verify() */
740 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
745 /* If ca is true we must return if this is a valid CA certificate. */
750 * Check the optional key usage field:
751 * if Key Usage is present, it must be one of digitalSignature
752 * and/or nonRepudiation (other values are not consistent and shall
755 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
756 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
757 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
760 /* Only time stamp key usage is permitted and it's required. */
761 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
764 /* Extended Key Usage MUST be critical */
765 i_ext
= X509_get_ext_by_NID((X509
*)x
, NID_ext_key_usage
, -1);
767 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
768 if (!X509_EXTENSION_get_critical(ext
))
775 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
781 * Various checks to see if one certificate issued the second.
782 * This can be used to prune a set of possible issuer certificates
783 * which have been looked up using some simple method such as by
786 * 1. Check issuer_name(subject) == subject_name(issuer)
787 * 2. If akid(subject) exists check it matches issuer
788 * 3. If key_usage(issuer) exists check it supports certificate signing
789 * returns 0 for OK, positive for reason for mismatch, reasons match
790 * codes for X509_verify_cert()
793 int X509_check_issued(X509
*issuer
, X509
*subject
)
795 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
796 X509_get_issuer_name(subject
)))
797 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
798 x509v3_cache_extensions(issuer
);
799 x509v3_cache_extensions(subject
);
802 int ret
= X509_check_akid(issuer
, subject
->akid
);
803 if (ret
!= X509_V_OK
)
807 if (subject
->ex_flags
& EXFLAG_PROXY
) {
808 if (ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
809 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
810 } else if (ku_reject(issuer
, KU_KEY_CERT_SIGN
))
811 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
815 int X509_check_akid(X509
*issuer
, AUTHORITY_KEYID
*akid
)
821 /* Check key ids (if present) */
822 if (akid
->keyid
&& issuer
->skid
&&
823 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
))
824 return X509_V_ERR_AKID_SKID_MISMATCH
;
825 /* Check serial number */
827 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer
), akid
->serial
))
828 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
829 /* Check issuer name */
832 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
833 * GeneralName. So look for a DirName. There may be more than one but
834 * we only take any notice of the first.
838 X509_NAME
*nm
= NULL
;
841 for (i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++) {
842 gen
= sk_GENERAL_NAME_value(gens
, i
);
843 if (gen
->type
== GEN_DIRNAME
) {
848 if (nm
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)))
849 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;