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 static STACK_OF(X509_PURPOSE
) *xptable
= NULL
;
115 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
)
117 return (*a
)->purpose
- (*b
)->purpose
;
121 * As much as I'd like to make X509_check_purpose use a "const" X509* I
122 * really can't because it does recalculate hashes and do other non-const
125 int X509_check_purpose(X509
*x
, int id
, int ca
)
128 const X509_PURPOSE
*pt
;
129 if (!(x
->ex_flags
& EXFLAG_SET
)) {
130 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
131 x509v3_cache_extensions(x
);
132 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
136 idx
= X509_PURPOSE_get_by_id(id
);
139 pt
= X509_PURPOSE_get0(idx
);
140 return pt
->check_purpose(pt
, x
, ca
);
143 int X509_PURPOSE_set(int *p
, int purpose
)
145 if (X509_PURPOSE_get_by_id(purpose
) == -1) {
146 X509V3err(X509V3_F_X509_PURPOSE_SET
, X509V3_R_INVALID_PURPOSE
);
153 int X509_PURPOSE_get_count(void)
156 return X509_PURPOSE_COUNT
;
157 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
160 X509_PURPOSE
*X509_PURPOSE_get0(int idx
)
164 if (idx
< (int)X509_PURPOSE_COUNT
)
165 return xstandard
+ idx
;
166 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
169 int X509_PURPOSE_get_by_sname(char *sname
)
173 for (i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
174 xptmp
= X509_PURPOSE_get0(i
);
175 if (!strcmp(xptmp
->sname
, sname
))
181 int X509_PURPOSE_get_by_id(int purpose
)
185 if ((purpose
>= X509_PURPOSE_MIN
) && (purpose
<= X509_PURPOSE_MAX
))
186 return purpose
- X509_PURPOSE_MIN
;
187 tmp
.purpose
= purpose
;
190 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
193 return idx
+ X509_PURPOSE_COUNT
;
196 int X509_PURPOSE_add(int id
, int trust
, int flags
,
197 int (*ck
) (const X509_PURPOSE
*, const X509
*, int),
198 char *name
, char *sname
, void *arg
)
203 * This is set according to what we change: application can't set it
205 flags
&= ~X509_PURPOSE_DYNAMIC
;
206 /* This will always be set for application modified trust entries */
207 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
208 /* Get existing entry if any */
209 idx
= X509_PURPOSE_get_by_id(id
);
210 /* Need a new entry */
212 if (!(ptmp
= OPENSSL_malloc(sizeof(X509_PURPOSE
)))) {
213 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
216 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
218 ptmp
= X509_PURPOSE_get0(idx
);
220 /* OPENSSL_free existing name if dynamic */
221 if (ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
222 OPENSSL_free(ptmp
->name
);
223 OPENSSL_free(ptmp
->sname
);
225 /* dup supplied name */
226 ptmp
->name
= BUF_strdup(name
);
227 ptmp
->sname
= BUF_strdup(sname
);
228 if (!ptmp
->name
|| !ptmp
->sname
) {
229 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
232 /* Keep the dynamic flag of existing entry */
233 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
234 /* Set all other flags */
235 ptmp
->flags
|= flags
;
239 ptmp
->check_purpose
= ck
;
240 ptmp
->usr_data
= arg
;
242 /* If its a new entry manage the dynamic table */
244 if (!xptable
&& !(xptable
= sk_X509_PURPOSE_new(xp_cmp
))) {
245 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
248 if (!sk_X509_PURPOSE_push(xptable
, ptmp
)) {
249 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
256 static void xptable_free(X509_PURPOSE
*p
)
260 if (p
->flags
& X509_PURPOSE_DYNAMIC
) {
261 if (p
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
262 OPENSSL_free(p
->name
);
263 OPENSSL_free(p
->sname
);
269 void X509_PURPOSE_cleanup(void)
272 sk_X509_PURPOSE_pop_free(xptable
, xptable_free
);
273 for (i
= 0; i
< X509_PURPOSE_COUNT
; i
++)
274 xptable_free(xstandard
+ i
);
278 int X509_PURPOSE_get_id(X509_PURPOSE
*xp
)
283 char *X509_PURPOSE_get0_name(X509_PURPOSE
*xp
)
288 char *X509_PURPOSE_get0_sname(X509_PURPOSE
*xp
)
293 int X509_PURPOSE_get_trust(X509_PURPOSE
*xp
)
298 static int nid_cmp(const int *a
, const int *b
)
303 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid
);
304 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid
);
306 int X509_supported_extension(X509_EXTENSION
*ex
)
309 * This table is a list of the NIDs of supported extensions: that is
310 * those which are used by the verify process. If an extension is
311 * critical and doesn't appear in this list then the verify process will
312 * normally reject the certificate. The list must be kept in numerical
313 * order because it will be searched using bsearch.
316 static const int supported_nids
[] = {
317 NID_netscape_cert_type
, /* 71 */
318 NID_key_usage
, /* 83 */
319 NID_subject_alt_name
, /* 85 */
320 NID_basic_constraints
, /* 87 */
321 NID_certificate_policies
, /* 89 */
322 NID_ext_key_usage
, /* 126 */
323 NID_sbgp_ipAddrBlock
, /* 290 */
324 NID_sbgp_autonomousSysNum
, /* 291 */
325 NID_policy_constraints
, /* 401 */
326 NID_proxyCertInfo
, /* 663 */
327 NID_name_constraints
, /* 666 */
328 NID_policy_mappings
, /* 747 */
329 NID_inhibit_any_policy
/* 748 */
332 int ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
334 if (ex_nid
== NID_undef
)
337 if (OBJ_bsearch_nid(&ex_nid
, supported_nids
,
338 sizeof(supported_nids
) / sizeof(int)))
343 static void setup_dp(X509
*x
, DIST_POINT
*dp
)
345 X509_NAME
*iname
= NULL
;
348 if (dp
->reasons
->length
> 0)
349 dp
->dp_reasons
= dp
->reasons
->data
[0];
350 if (dp
->reasons
->length
> 1)
351 dp
->dp_reasons
|= (dp
->reasons
->data
[1] << 8);
352 dp
->dp_reasons
&= CRLDP_ALL_REASONS
;
354 dp
->dp_reasons
= CRLDP_ALL_REASONS
;
355 if (!dp
->distpoint
|| (dp
->distpoint
->type
!= 1))
357 for (i
= 0; i
< sk_GENERAL_NAME_num(dp
->CRLissuer
); i
++) {
358 GENERAL_NAME
*gen
= sk_GENERAL_NAME_value(dp
->CRLissuer
, i
);
359 if (gen
->type
== GEN_DIRNAME
) {
360 iname
= gen
->d
.directoryName
;
365 iname
= X509_get_issuer_name(x
);
367 DIST_POINT_set_dpname(dp
->distpoint
, iname
);
371 static void setup_crldp(X509
*x
)
374 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, NULL
, NULL
);
375 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++)
376 setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
));
379 static void x509v3_cache_extensions(X509
*x
)
381 BASIC_CONSTRAINTS
*bs
;
382 PROXY_CERT_INFO_EXTENSION
*pci
;
383 ASN1_BIT_STRING
*usage
;
385 EXTENDED_KEY_USAGE
*extusage
;
389 if (x
->ex_flags
& EXFLAG_SET
)
391 X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
);
392 /* V1 should mean no extensions ... */
393 if (!X509_get_version(x
))
394 x
->ex_flags
|= EXFLAG_V1
;
395 /* Handle basic constraints */
396 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, NULL
, NULL
))) {
398 x
->ex_flags
|= EXFLAG_CA
;
400 if ((bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
)
402 x
->ex_flags
|= EXFLAG_INVALID
;
405 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
408 BASIC_CONSTRAINTS_free(bs
);
409 x
->ex_flags
|= EXFLAG_BCONS
;
411 /* Handle proxy certificates */
412 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, NULL
, NULL
))) {
413 if (x
->ex_flags
& EXFLAG_CA
414 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
415 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
416 x
->ex_flags
|= EXFLAG_INVALID
;
418 if (pci
->pcPathLengthConstraint
) {
419 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
421 x
->ex_pcpathlen
= -1;
422 PROXY_CERT_INFO_EXTENSION_free(pci
);
423 x
->ex_flags
|= EXFLAG_PROXY
;
425 /* Handle key usage */
426 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, NULL
, NULL
))) {
427 if (usage
->length
> 0) {
428 x
->ex_kusage
= usage
->data
[0];
429 if (usage
->length
> 1)
430 x
->ex_kusage
|= usage
->data
[1] << 8;
433 x
->ex_flags
|= EXFLAG_KUSAGE
;
434 ASN1_BIT_STRING_free(usage
);
437 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, NULL
, NULL
))) {
438 x
->ex_flags
|= EXFLAG_XKUSAGE
;
439 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
440 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
441 case NID_server_auth
:
442 x
->ex_xkusage
|= XKU_SSL_SERVER
;
445 case NID_client_auth
:
446 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
449 case NID_email_protect
:
450 x
->ex_xkusage
|= XKU_SMIME
;
454 x
->ex_xkusage
|= XKU_CODE_SIGN
;
459 x
->ex_xkusage
|= XKU_SGC
;
463 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
467 x
->ex_xkusage
|= XKU_TIMESTAMP
;
471 x
->ex_xkusage
|= XKU_DVCS
;
474 case NID_anyExtendedKeyUsage
:
475 x
->ex_xkusage
|= XKU_ANYEKU
;
479 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
482 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, NULL
, NULL
))) {
484 x
->ex_nscert
= ns
->data
[0];
487 x
->ex_flags
|= EXFLAG_NSCERT
;
488 ASN1_BIT_STRING_free(ns
);
490 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, NULL
, NULL
);
491 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, NULL
, NULL
);
492 /* Does subject name match issuer ? */
493 if (!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
))) {
494 x
->ex_flags
|= EXFLAG_SI
;
495 /* If SKID matches AKID also indicate self signed */
496 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
)
497 x
->ex_flags
|= EXFLAG_SS
;
499 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, NULL
, NULL
);
500 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
501 if (!x
->nc
&& (i
!= -1))
502 x
->ex_flags
|= EXFLAG_INVALID
;
505 x
->rfc3779_addr
= X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, NULL
, NULL
);
506 x
->rfc3779_asid
= X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
,
508 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
509 ex
= X509_get_ext(x
, i
);
510 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex
))
512 x
->ex_flags
|= EXFLAG_FRESHEST
;
513 if (!X509_EXTENSION_get_critical(ex
))
515 if (!X509_supported_extension(ex
)) {
516 x
->ex_flags
|= EXFLAG_CRITICAL
;
520 x
->ex_flags
|= EXFLAG_SET
;
524 * CA checks common to all purposes
528 * 2 basicConstraints absent so "maybe" a CA
529 * 3 basicConstraints absent but self signed V1.
530 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
533 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
534 #define ku_reject(x, usage) \
535 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
536 #define xku_reject(x, usage) \
537 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
538 #define ns_reject(x, usage) \
539 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
541 static int check_ca(const X509
*x
)
543 /* keyUsage if present should allow cert signing */
544 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
546 if (x
->ex_flags
& EXFLAG_BCONS
) {
547 if (x
->ex_flags
& EXFLAG_CA
)
549 /* If basicConstraints says not a CA then say so */
553 /* we support V1 roots for... uh, I don't really know why. */
554 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
557 * If key usage present it must have certSign so tolerate it
559 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
561 /* Older certificates could have Netscape-specific CA types */
562 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
564 /* can this still be regarded a CA certificate? I doubt it */
569 int X509_check_ca(X509
*x
)
571 if (!(x
->ex_flags
& EXFLAG_SET
)) {
572 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
573 x509v3_cache_extensions(x
);
574 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
580 /* Check SSL CA: common checks for SSL client and server */
581 static int check_ssl_ca(const X509
*x
)
584 ca_ret
= check_ca(x
);
587 /* check nsCertType if present */
588 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
)
594 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
597 if (xku_reject(x
, XKU_SSL_CLIENT
))
600 return check_ssl_ca(x
);
601 /* We need to do digital signatures or key agreement */
602 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
604 /* nsCertType if present should allow SSL client use */
605 if (ns_reject(x
, NS_SSL_CLIENT
))
611 * Key usage needed for TLS/SSL server: digital signature, encipherment or
612 * key agreement. The ssl code can check this more thoroughly for individual
616 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
618 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
621 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
624 return check_ssl_ca(x
);
626 if (ns_reject(x
, NS_SSL_SERVER
))
628 if (ku_reject(x
, KU_TLS
))
635 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
639 ret
= check_purpose_ssl_server(xp
, x
, ca
);
642 /* We need to encipher or Netscape complains */
643 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
648 /* common S/MIME checks */
649 static int purpose_smime(const X509
*x
, int ca
)
651 if (xku_reject(x
, XKU_SMIME
))
655 ca_ret
= check_ca(x
);
658 /* check nsCertType if present */
659 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
664 if (x
->ex_flags
& EXFLAG_NSCERT
) {
665 if (x
->ex_nscert
& NS_SMIME
)
667 /* Workaround for some buggy certificates */
668 if (x
->ex_nscert
& NS_SSL_CLIENT
)
675 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
679 ret
= purpose_smime(x
, ca
);
682 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
687 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
691 ret
= purpose_smime(x
, ca
);
694 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
699 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
704 if ((ca_ret
= check_ca(x
)) != 2)
709 if (ku_reject(x
, KU_CRL_SIGN
))
715 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
716 * is valid. Additional checks must be made on the chain.
719 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
722 * Must be a valid CA. Should we really support the "I don't know" value
727 /* leaf certificate is checked in OCSP_verify() */
731 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
736 /* If ca is true we must return if this is a valid CA certificate. */
741 * Check the optional key usage field:
742 * if Key Usage is present, it must be one of digitalSignature
743 * and/or nonRepudiation (other values are not consistent and shall
746 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
747 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
748 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
751 /* Only time stamp key usage is permitted and it's required. */
752 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
755 /* Extended Key Usage MUST be critical */
756 i_ext
= X509_get_ext_by_NID((X509
*)x
, NID_ext_key_usage
, -1);
758 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
759 if (!X509_EXTENSION_get_critical(ext
))
766 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
772 * Various checks to see if one certificate issued the second.
773 * This can be used to prune a set of possible issuer certificates
774 * which have been looked up using some simple method such as by
777 * 1. Check issuer_name(subject) == subject_name(issuer)
778 * 2. If akid(subject) exists check it matches issuer
779 * 3. If key_usage(issuer) exists check it supports certificate signing
780 * returns 0 for OK, positive for reason for mismatch, reasons match
781 * codes for X509_verify_cert()
784 int X509_check_issued(X509
*issuer
, X509
*subject
)
786 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
787 X509_get_issuer_name(subject
)))
788 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
789 x509v3_cache_extensions(issuer
);
790 x509v3_cache_extensions(subject
);
793 int ret
= X509_check_akid(issuer
, subject
->akid
);
794 if (ret
!= X509_V_OK
)
798 if (subject
->ex_flags
& EXFLAG_PROXY
) {
799 if (ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
800 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
801 } else if (ku_reject(issuer
, KU_KEY_CERT_SIGN
))
802 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
806 int X509_check_akid(X509
*issuer
, AUTHORITY_KEYID
*akid
)
812 /* Check key ids (if present) */
813 if (akid
->keyid
&& issuer
->skid
&&
814 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
))
815 return X509_V_ERR_AKID_SKID_MISMATCH
;
816 /* Check serial number */
818 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer
), akid
->serial
))
819 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
820 /* Check issuer name */
823 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
824 * GeneralName. So look for a DirName. There may be more than one but
825 * we only take any notice of the first.
829 X509_NAME
*nm
= NULL
;
832 for (i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++) {
833 gen
= sk_GENERAL_NAME_value(gens
, i
);
834 if (gen
->type
== GEN_DIRNAME
) {
839 if (nm
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)))
840 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;