2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
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).
61 #include <openssl/x509v3.h>
62 #include <openssl/x509_vfy.h>
64 static void x509v3_cache_extensions(X509
*x
);
66 static int check_ssl_ca(const X509
*x
);
67 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
68 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
69 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
70 static int purpose_smime(const X509
*x
, int ca
);
71 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
72 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
73 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
74 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
75 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
76 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
78 static int xp_cmp(const X509_PURPOSE
* const *a
,
79 const X509_PURPOSE
* const *b
);
80 static void xptable_free(X509_PURPOSE
*p
);
82 static X509_PURPOSE xstandard
[] = {
83 {X509_PURPOSE_SSL_CLIENT
, X509_TRUST_SSL_CLIENT
, 0, check_purpose_ssl_client
, "SSL client", "sslclient", NULL
},
84 {X509_PURPOSE_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0, check_purpose_ssl_server
, "SSL server", "sslserver", NULL
},
85 {X509_PURPOSE_NS_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0, check_purpose_ns_ssl_server
, "Netscape SSL server", "nssslserver", NULL
},
86 {X509_PURPOSE_SMIME_SIGN
, X509_TRUST_EMAIL
, 0, check_purpose_smime_sign
, "S/MIME signing", "smimesign", NULL
},
87 {X509_PURPOSE_SMIME_ENCRYPT
, X509_TRUST_EMAIL
, 0, check_purpose_smime_encrypt
, "S/MIME encryption", "smimeencrypt", NULL
},
88 {X509_PURPOSE_CRL_SIGN
, X509_TRUST_COMPAT
, 0, check_purpose_crl_sign
, "CRL signing", "crlsign", NULL
},
89 {X509_PURPOSE_ANY
, X509_TRUST_DEFAULT
, 0, no_check
, "Any Purpose", "any", NULL
},
90 {X509_PURPOSE_OCSP_HELPER
, X509_TRUST_COMPAT
, 0, ocsp_helper
, "OCSP helper", "ocsphelper", NULL
},
91 {X509_PURPOSE_TIMESTAMP_SIGN
, X509_TRUST_TSA
, 0, check_purpose_timestamp_sign
, "Time Stamp signing", "timestampsign", NULL
},
94 #define X509_PURPOSE_COUNT (sizeof(xstandard)/sizeof(X509_PURPOSE))
96 IMPLEMENT_STACK_OF(X509_PURPOSE
)
98 static STACK_OF(X509_PURPOSE
) *xptable
= NULL
;
100 static int xp_cmp(const X509_PURPOSE
* const *a
,
101 const X509_PURPOSE
* const *b
)
103 return (*a
)->purpose
- (*b
)->purpose
;
106 /* As much as I'd like to make X509_check_purpose use a "const" X509*
107 * I really can't because it does recalculate hashes and do other non-const
109 int X509_check_purpose(X509
*x
, int id
, int ca
)
112 const X509_PURPOSE
*pt
;
113 if(!(x
->ex_flags
& EXFLAG_SET
)) {
114 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
115 x509v3_cache_extensions(x
);
116 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
118 if(id
== -1) return 1;
119 idx
= X509_PURPOSE_get_by_id(id
);
120 if(idx
== -1) return -1;
121 pt
= X509_PURPOSE_get0(idx
);
122 return pt
->check_purpose(pt
, x
, ca
);
125 int X509_PURPOSE_set(int *p
, int purpose
)
127 if(X509_PURPOSE_get_by_id(purpose
) == -1) {
128 X509V3err(X509V3_F_X509_PURPOSE_SET
, X509V3_R_INVALID_PURPOSE
);
135 int X509_PURPOSE_get_count(void)
137 if(!xptable
) return X509_PURPOSE_COUNT
;
138 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
141 X509_PURPOSE
* X509_PURPOSE_get0(int idx
)
143 if(idx
< 0) return NULL
;
144 if(idx
< (int)X509_PURPOSE_COUNT
) return xstandard
+ idx
;
145 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
148 int X509_PURPOSE_get_by_sname(char *sname
)
152 for(i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
153 xptmp
= X509_PURPOSE_get0(i
);
154 if(!strcmp(xptmp
->sname
, sname
)) return i
;
159 int X509_PURPOSE_get_by_id(int purpose
)
163 if((purpose
>= X509_PURPOSE_MIN
) && (purpose
<= X509_PURPOSE_MAX
))
164 return purpose
- X509_PURPOSE_MIN
;
165 tmp
.purpose
= purpose
;
166 if(!xptable
) return -1;
167 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
168 if(idx
== -1) return -1;
169 return idx
+ X509_PURPOSE_COUNT
;
172 int X509_PURPOSE_add(int id
, int trust
, int flags
,
173 int (*ck
)(const X509_PURPOSE
*, const X509
*, int),
174 char *name
, char *sname
, void *arg
)
178 /* This is set according to what we change: application can't set it */
179 flags
&= ~X509_PURPOSE_DYNAMIC
;
180 /* This will always be set for application modified trust entries */
181 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
182 /* Get existing entry if any */
183 idx
= X509_PURPOSE_get_by_id(id
);
184 /* Need a new entry */
186 if(!(ptmp
= OPENSSL_malloc(sizeof(X509_PURPOSE
)))) {
187 X509V3err(X509V3_F_X509_PURPOSE_ADD
,ERR_R_MALLOC_FAILURE
);
190 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
191 } else ptmp
= X509_PURPOSE_get0(idx
);
193 /* OPENSSL_free existing name if dynamic */
194 if(ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
195 OPENSSL_free(ptmp
->name
);
196 OPENSSL_free(ptmp
->sname
);
198 /* dup supplied name */
199 ptmp
->name
= BUF_strdup(name
);
200 ptmp
->sname
= BUF_strdup(sname
);
201 if(!ptmp
->name
|| !ptmp
->sname
) {
202 X509V3err(X509V3_F_X509_PURPOSE_ADD
,ERR_R_MALLOC_FAILURE
);
205 /* Keep the dynamic flag of existing entry */
206 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
207 /* Set all other flags */
208 ptmp
->flags
|= flags
;
212 ptmp
->check_purpose
= ck
;
213 ptmp
->usr_data
= arg
;
215 /* If its a new entry manage the dynamic table */
217 if(!xptable
&& !(xptable
= sk_X509_PURPOSE_new(xp_cmp
))) {
218 X509V3err(X509V3_F_X509_PURPOSE_ADD
,ERR_R_MALLOC_FAILURE
);
221 if (!sk_X509_PURPOSE_push(xptable
, ptmp
)) {
222 X509V3err(X509V3_F_X509_PURPOSE_ADD
,ERR_R_MALLOC_FAILURE
);
229 static void xptable_free(X509_PURPOSE
*p
)
232 if (p
->flags
& X509_PURPOSE_DYNAMIC
)
234 if (p
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
235 OPENSSL_free(p
->name
);
236 OPENSSL_free(p
->sname
);
242 void X509_PURPOSE_cleanup(void)
245 sk_X509_PURPOSE_pop_free(xptable
, xptable_free
);
246 for(i
= 0; i
< X509_PURPOSE_COUNT
; i
++) xptable_free(xstandard
+ i
);
250 int X509_PURPOSE_get_id(X509_PURPOSE
*xp
)
255 char *X509_PURPOSE_get0_name(X509_PURPOSE
*xp
)
260 char *X509_PURPOSE_get0_sname(X509_PURPOSE
*xp
)
265 int X509_PURPOSE_get_trust(X509_PURPOSE
*xp
)
270 static int nid_cmp(int *a
, int *b
)
275 int X509_supported_extension(X509_EXTENSION
*ex
)
277 /* This table is a list of the NIDs of supported extensions:
278 * that is those which are used by the verify process. If
279 * an extension is critical and doesn't appear in this list
280 * then the verify process will normally reject the certificate.
281 * The list must be kept in numerical order because it will be
282 * searched using bsearch.
285 static int supported_nids
[] = {
286 NID_netscape_cert_type
, /* 71 */
287 NID_key_usage
, /* 83 */
288 NID_subject_alt_name
, /* 85 */
289 NID_basic_constraints
, /* 87 */
290 NID_certificate_policies
, /* 89 */
291 NID_ext_key_usage
, /* 126 */
292 #ifndef OPENSSL_NO_RFC3779
293 NID_sbgp_ipAddrBlock
, /* 290 */
294 NID_sbgp_autonomousSysNum
, /* 291 */
296 NID_policy_constraints
, /* 401 */
297 NID_proxyCertInfo
, /* 663 */
298 NID_name_constraints
, /* 666 */
299 NID_policy_mappings
, /* 747 */
300 NID_inhibit_any_policy
/* 748 */
305 ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
307 if (ex_nid
== NID_undef
)
310 if (OBJ_bsearch((char *)&ex_nid
, (char *)supported_nids
,
311 sizeof(supported_nids
)/sizeof(int), sizeof(int),
312 (int (*)(const void *, const void *))nid_cmp
))
317 static void setup_dp(X509
*x
, DIST_POINT
*dp
)
319 X509_NAME
*iname
= NULL
;
321 if (!dp
->distpoint
|| (dp
->distpoint
->type
!= 1))
323 for (i
= 0; i
< sk_GENERAL_NAME_num(dp
->CRLissuer
); i
++)
325 GENERAL_NAME
*gen
= sk_GENERAL_NAME_value(dp
->CRLissuer
, i
);
326 if (gen
->type
== GEN_DIRNAME
)
328 iname
= gen
->d
.directoryName
;
333 iname
= X509_get_issuer_name(x
);
335 DIST_POINT_set_dpname(dp
->distpoint
, iname
);
339 static void setup_crldp(X509
*x
)
342 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, NULL
, NULL
);
343 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++)
344 setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
));
347 static void x509v3_cache_extensions(X509
*x
)
349 BASIC_CONSTRAINTS
*bs
;
350 PROXY_CERT_INFO_EXTENSION
*pci
;
351 ASN1_BIT_STRING
*usage
;
353 EXTENDED_KEY_USAGE
*extusage
;
357 if(x
->ex_flags
& EXFLAG_SET
) return;
358 #ifndef OPENSSL_NO_SHA
359 X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
);
361 /* Does subject name match issuer ? */
362 if(!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
)))
363 x
->ex_flags
|= EXFLAG_SI
;
364 /* V1 should mean no extensions ... */
365 if(!X509_get_version(x
)) x
->ex_flags
|= EXFLAG_V1
;
366 /* Handle basic constraints */
367 if((bs
=X509_get_ext_d2i(x
, NID_basic_constraints
, NULL
, NULL
))) {
368 if(bs
->ca
) x
->ex_flags
|= EXFLAG_CA
;
370 if((bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
)
372 x
->ex_flags
|= EXFLAG_INVALID
;
374 } else x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
375 } else x
->ex_pathlen
= -1;
376 BASIC_CONSTRAINTS_free(bs
);
377 x
->ex_flags
|= EXFLAG_BCONS
;
379 /* Handle proxy certificates */
380 if((pci
=X509_get_ext_d2i(x
, NID_proxyCertInfo
, NULL
, NULL
))) {
381 if (x
->ex_flags
& EXFLAG_CA
382 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, 0) >= 0
383 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, 0) >= 0) {
384 x
->ex_flags
|= EXFLAG_INVALID
;
386 if (pci
->pcPathLengthConstraint
) {
388 ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
389 } else x
->ex_pcpathlen
= -1;
390 PROXY_CERT_INFO_EXTENSION_free(pci
);
391 x
->ex_flags
|= EXFLAG_PROXY
;
393 /* Handle key usage */
394 if((usage
=X509_get_ext_d2i(x
, NID_key_usage
, NULL
, NULL
))) {
395 if(usage
->length
> 0) {
396 x
->ex_kusage
= usage
->data
[0];
397 if(usage
->length
> 1)
398 x
->ex_kusage
|= usage
->data
[1] << 8;
399 } else x
->ex_kusage
= 0;
400 x
->ex_flags
|= EXFLAG_KUSAGE
;
401 ASN1_BIT_STRING_free(usage
);
404 if((extusage
=X509_get_ext_d2i(x
, NID_ext_key_usage
, NULL
, NULL
))) {
405 x
->ex_flags
|= EXFLAG_XKUSAGE
;
406 for(i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
407 switch(OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
,i
))) {
408 case NID_server_auth
:
409 x
->ex_xkusage
|= XKU_SSL_SERVER
;
412 case NID_client_auth
:
413 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
416 case NID_email_protect
:
417 x
->ex_xkusage
|= XKU_SMIME
;
421 x
->ex_xkusage
|= XKU_CODE_SIGN
;
426 x
->ex_xkusage
|= XKU_SGC
;
430 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
434 x
->ex_xkusage
|= XKU_TIMESTAMP
;
438 x
->ex_xkusage
|= XKU_DVCS
;
442 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
445 if((ns
=X509_get_ext_d2i(x
, NID_netscape_cert_type
, NULL
, NULL
))) {
446 if(ns
->length
> 0) x
->ex_nscert
= ns
->data
[0];
447 else x
->ex_nscert
= 0;
448 x
->ex_flags
|= EXFLAG_NSCERT
;
449 ASN1_BIT_STRING_free(ns
);
451 x
->skid
=X509_get_ext_d2i(x
, NID_subject_key_identifier
, NULL
, NULL
);
452 x
->akid
=X509_get_ext_d2i(x
, NID_authority_key_identifier
, NULL
, NULL
);
453 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, NULL
, NULL
);
454 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
455 if (!x
->nc
&& (i
!= -1))
456 x
->ex_flags
|= EXFLAG_INVALID
;
460 #ifndef OPENSSL_NO_RFC3779
461 x
->rfc3779_addr
=X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, NULL
, NULL
);
462 x
->rfc3779_asid
=X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
,
465 for (i
= 0; i
< X509_get_ext_count(x
); i
++)
467 ex
= X509_get_ext(x
, i
);
468 if (!X509_EXTENSION_get_critical(ex
))
470 if (!X509_supported_extension(ex
))
472 x
->ex_flags
|= EXFLAG_CRITICAL
;
476 x
->ex_flags
|= EXFLAG_SET
;
479 /* CA checks common to all purposes
483 * 2 basicConstraints absent so "maybe" a CA
484 * 3 basicConstraints absent but self signed V1.
485 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
488 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
489 #define ku_reject(x, usage) \
490 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
491 #define xku_reject(x, usage) \
492 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
493 #define ns_reject(x, usage) \
494 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
496 static int check_ca(const X509
*x
)
498 /* keyUsage if present should allow cert signing */
499 if(ku_reject(x
, KU_KEY_CERT_SIGN
)) return 0;
500 if(x
->ex_flags
& EXFLAG_BCONS
) {
501 if(x
->ex_flags
& EXFLAG_CA
) return 1;
502 /* If basicConstraints says not a CA then say so */
505 /* we support V1 roots for... uh, I don't really know why. */
506 if((x
->ex_flags
& V1_ROOT
) == V1_ROOT
) return 3;
507 /* If key usage present it must have certSign so tolerate it */
508 else if (x
->ex_flags
& EXFLAG_KUSAGE
) return 4;
509 /* Older certificates could have Netscape-specific CA types */
510 else if (x
->ex_flags
& EXFLAG_NSCERT
511 && x
->ex_nscert
& NS_ANY_CA
) return 5;
512 /* can this still be regarded a CA certificate? I doubt it */
517 int X509_check_ca(X509
*x
)
519 if(!(x
->ex_flags
& EXFLAG_SET
)) {
520 CRYPTO_w_lock(CRYPTO_LOCK_X509
);
521 x509v3_cache_extensions(x
);
522 CRYPTO_w_unlock(CRYPTO_LOCK_X509
);
528 /* Check SSL CA: common checks for SSL client and server */
529 static int check_ssl_ca(const X509
*x
)
532 ca_ret
= check_ca(x
);
533 if(!ca_ret
) return 0;
534 /* check nsCertType if present */
535 if(ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
) return ca_ret
;
540 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
542 if(xku_reject(x
,XKU_SSL_CLIENT
)) return 0;
543 if(ca
) return check_ssl_ca(x
);
544 /* We need to do digital signatures with it */
545 if(ku_reject(x
,KU_DIGITAL_SIGNATURE
)) return 0;
546 /* nsCertType if present should allow SSL client use */
547 if(ns_reject(x
, NS_SSL_CLIENT
)) return 0;
551 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
553 if(xku_reject(x
,XKU_SSL_SERVER
|XKU_SGC
)) return 0;
554 if(ca
) return check_ssl_ca(x
);
556 if(ns_reject(x
, NS_SSL_SERVER
)) return 0;
557 /* Now as for keyUsage: we'll at least need to sign OR encipher */
558 if(ku_reject(x
, KU_DIGITAL_SIGNATURE
|KU_KEY_ENCIPHERMENT
)) return 0;
564 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
567 ret
= check_purpose_ssl_server(xp
, x
, ca
);
568 if(!ret
|| ca
) return ret
;
569 /* We need to encipher or Netscape complains */
570 if(ku_reject(x
, KU_KEY_ENCIPHERMENT
)) return 0;
574 /* common S/MIME checks */
575 static int purpose_smime(const X509
*x
, int ca
)
577 if(xku_reject(x
,XKU_SMIME
)) return 0;
580 ca_ret
= check_ca(x
);
581 if(!ca_ret
) return 0;
582 /* check nsCertType if present */
583 if(ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
) return ca_ret
;
586 if(x
->ex_flags
& EXFLAG_NSCERT
) {
587 if(x
->ex_nscert
& NS_SMIME
) return 1;
588 /* Workaround for some buggy certificates */
589 if(x
->ex_nscert
& NS_SSL_CLIENT
) return 2;
595 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
598 ret
= purpose_smime(x
, ca
);
599 if(!ret
|| ca
) return ret
;
600 if(ku_reject(x
, KU_DIGITAL_SIGNATURE
|KU_NON_REPUDIATION
)) return 0;
604 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
607 ret
= purpose_smime(x
, ca
);
608 if(!ret
|| ca
) return ret
;
609 if(ku_reject(x
, KU_KEY_ENCIPHERMENT
)) return 0;
613 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
617 if((ca_ret
= check_ca(x
)) != 2) return ca_ret
;
620 if(ku_reject(x
, KU_CRL_SIGN
)) return 0;
624 /* OCSP helper: this is *not* a full OCSP check. It just checks that
625 * each CA is valid. Additional checks must be made on the chain.
628 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
630 /* Must be a valid CA. Should we really support the "I don't know"
632 if(ca
) return check_ca(x
);
633 /* leaf certificate is checked in OCSP_verify() */
637 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
642 /* If ca is true we must return if this is a valid CA certificate. */
643 if (ca
) return check_ca(x
);
646 * Check the optional key usage field:
647 * if Key Usage is present, it must be one of digitalSignature
648 * and/or nonRepudiation (other values are not consistent and shall
651 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
652 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
653 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
656 /* Only time stamp key usage is permitted and it's required. */
657 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
660 /* Extended Key Usage MUST be critical */
661 i_ext
= X509_get_ext_by_NID((X509
*) x
, NID_ext_key_usage
, 0);
664 X509_EXTENSION
*ext
= X509_get_ext((X509
*) x
, i_ext
);
665 if (!X509_EXTENSION_get_critical(ext
))
672 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
677 /* Various checks to see if one certificate issued the second.
678 * This can be used to prune a set of possible issuer certificates
679 * which have been looked up using some simple method such as by
682 * 1. Check issuer_name(subject) == subject_name(issuer)
683 * 2. If akid(subject) exists check it matches issuer
684 * 3. If key_usage(issuer) exists check it supports certificate signing
685 * returns 0 for OK, positive for reason for mismatch, reasons match
686 * codes for X509_verify_cert()
689 int X509_check_issued(X509
*issuer
, X509
*subject
)
691 if(X509_NAME_cmp(X509_get_subject_name(issuer
),
692 X509_get_issuer_name(subject
)))
693 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
694 x509v3_cache_extensions(issuer
);
695 x509v3_cache_extensions(subject
);
699 int ret
= X509_check_akid(issuer
, subject
->akid
);
700 if (ret
!= X509_V_OK
)
704 if(subject
->ex_flags
& EXFLAG_PROXY
)
706 if(ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
707 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
709 else if(ku_reject(issuer
, KU_KEY_CERT_SIGN
))
710 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
714 int X509_check_akid(X509
*issuer
, AUTHORITY_KEYID
*akid
)
720 /* Check key ids (if present) */
721 if(akid
->keyid
&& issuer
->skid
&&
722 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
) )
723 return X509_V_ERR_AKID_SKID_MISMATCH
;
724 /* Check serial number */
726 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer
), akid
->serial
))
727 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
728 /* Check issuer name */
731 /* Ugh, for some peculiar reason AKID includes
732 * SEQUENCE OF GeneralName. So look for a DirName.
733 * There may be more than one but we only take any
734 * notice of the first.
738 X509_NAME
*nm
= NULL
;
741 for(i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++)
743 gen
= sk_GENERAL_NAME_value(gens
, i
);
744 if(gen
->type
== GEN_DIRNAME
)
750 if(nm
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)))
751 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;