2 * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 #include "internal/cryptlib.h"
12 #include "internal/numbers.h"
13 #include <openssl/x509v3.h>
14 #include <openssl/x509_vfy.h>
15 #include "crypto/x509.h"
16 #include "internal/tsan_assist.h"
18 static void x509v3_cache_extensions(X509
*x
);
20 static int check_ssl_ca(const X509
*x
);
21 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
23 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
25 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
27 static int purpose_smime(const X509
*x
, int ca
);
28 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
30 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
32 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
34 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
36 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
37 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
39 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
);
40 static void xptable_free(X509_PURPOSE
*p
);
42 static X509_PURPOSE xstandard
[] = {
43 {X509_PURPOSE_SSL_CLIENT
, X509_TRUST_SSL_CLIENT
, 0,
44 check_purpose_ssl_client
, "SSL client", "sslclient", NULL
},
45 {X509_PURPOSE_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
46 check_purpose_ssl_server
, "SSL server", "sslserver", NULL
},
47 {X509_PURPOSE_NS_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
48 check_purpose_ns_ssl_server
, "Netscape SSL server", "nssslserver", NULL
},
49 {X509_PURPOSE_SMIME_SIGN
, X509_TRUST_EMAIL
, 0, check_purpose_smime_sign
,
50 "S/MIME signing", "smimesign", NULL
},
51 {X509_PURPOSE_SMIME_ENCRYPT
, X509_TRUST_EMAIL
, 0,
52 check_purpose_smime_encrypt
, "S/MIME encryption", "smimeencrypt", NULL
},
53 {X509_PURPOSE_CRL_SIGN
, X509_TRUST_COMPAT
, 0, check_purpose_crl_sign
,
54 "CRL signing", "crlsign", NULL
},
55 {X509_PURPOSE_ANY
, X509_TRUST_DEFAULT
, 0, no_check
, "Any Purpose", "any",
57 {X509_PURPOSE_OCSP_HELPER
, X509_TRUST_COMPAT
, 0, ocsp_helper
,
58 "OCSP helper", "ocsphelper", NULL
},
59 {X509_PURPOSE_TIMESTAMP_SIGN
, X509_TRUST_TSA
, 0,
60 check_purpose_timestamp_sign
, "Time Stamp signing", "timestampsign",
64 #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
66 static STACK_OF(X509_PURPOSE
) *xptable
= NULL
;
68 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
)
70 return (*a
)->purpose
- (*b
)->purpose
;
74 * As much as I'd like to make X509_check_purpose use a "const" X509* I
75 * really can't because it does recalculate hashes and do other non-const
78 int X509_check_purpose(X509
*x
, int id
, int ca
)
81 const X509_PURPOSE
*pt
;
83 x509v3_cache_extensions(x
);
85 /* Return if side-effect only call */
88 idx
= X509_PURPOSE_get_by_id(id
);
91 pt
= X509_PURPOSE_get0(idx
);
92 return pt
->check_purpose(pt
, x
, ca
);
95 int X509_PURPOSE_set(int *p
, int purpose
)
97 if (X509_PURPOSE_get_by_id(purpose
) == -1) {
98 X509V3err(X509V3_F_X509_PURPOSE_SET
, X509V3_R_INVALID_PURPOSE
);
105 int X509_PURPOSE_get_count(void)
108 return X509_PURPOSE_COUNT
;
109 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
112 X509_PURPOSE
*X509_PURPOSE_get0(int idx
)
116 if (idx
< (int)X509_PURPOSE_COUNT
)
117 return xstandard
+ idx
;
118 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
121 int X509_PURPOSE_get_by_sname(const char *sname
)
125 for (i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
126 xptmp
= X509_PURPOSE_get0(i
);
127 if (strcmp(xptmp
->sname
, sname
) == 0)
133 int X509_PURPOSE_get_by_id(int purpose
)
138 if ((purpose
>= X509_PURPOSE_MIN
) && (purpose
<= X509_PURPOSE_MAX
))
139 return purpose
- X509_PURPOSE_MIN
;
142 tmp
.purpose
= purpose
;
143 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
146 return idx
+ X509_PURPOSE_COUNT
;
149 int X509_PURPOSE_add(int id
, int trust
, int flags
,
150 int (*ck
) (const X509_PURPOSE
*, const X509
*, int),
151 const char *name
, const char *sname
, void *arg
)
156 * This is set according to what we change: application can't set it
158 flags
&= ~X509_PURPOSE_DYNAMIC
;
159 /* This will always be set for application modified trust entries */
160 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
161 /* Get existing entry if any */
162 idx
= X509_PURPOSE_get_by_id(id
);
163 /* Need a new entry */
165 if ((ptmp
= OPENSSL_malloc(sizeof(*ptmp
))) == NULL
) {
166 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
169 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
171 ptmp
= X509_PURPOSE_get0(idx
);
173 /* OPENSSL_free existing name if dynamic */
174 if (ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
175 OPENSSL_free(ptmp
->name
);
176 OPENSSL_free(ptmp
->sname
);
178 /* dup supplied name */
179 ptmp
->name
= OPENSSL_strdup(name
);
180 ptmp
->sname
= OPENSSL_strdup(sname
);
181 if (ptmp
->name
== NULL
|| ptmp
->sname
== NULL
) {
182 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
185 /* Keep the dynamic flag of existing entry */
186 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
187 /* Set all other flags */
188 ptmp
->flags
|= flags
;
192 ptmp
->check_purpose
= ck
;
193 ptmp
->usr_data
= arg
;
195 /* If its a new entry manage the dynamic table */
198 && (xptable
= sk_X509_PURPOSE_new(xp_cmp
)) == NULL
) {
199 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
202 if (!sk_X509_PURPOSE_push(xptable
, ptmp
)) {
203 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
210 OPENSSL_free(ptmp
->name
);
211 OPENSSL_free(ptmp
->sname
);
217 static void xptable_free(X509_PURPOSE
*p
)
221 if (p
->flags
& X509_PURPOSE_DYNAMIC
) {
222 if (p
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
223 OPENSSL_free(p
->name
);
224 OPENSSL_free(p
->sname
);
230 void X509_PURPOSE_cleanup(void)
232 sk_X509_PURPOSE_pop_free(xptable
, xptable_free
);
236 int X509_PURPOSE_get_id(const X509_PURPOSE
*xp
)
241 char *X509_PURPOSE_get0_name(const X509_PURPOSE
*xp
)
246 char *X509_PURPOSE_get0_sname(const X509_PURPOSE
*xp
)
251 int X509_PURPOSE_get_trust(const X509_PURPOSE
*xp
)
256 static int nid_cmp(const int *a
, const int *b
)
261 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid
);
262 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid
);
264 int X509_supported_extension(X509_EXTENSION
*ex
)
267 * This table is a list of the NIDs of supported extensions: that is
268 * those which are used by the verify process. If an extension is
269 * critical and doesn't appear in this list then the verify process will
270 * normally reject the certificate. The list must be kept in numerical
271 * order because it will be searched using bsearch.
274 static const int supported_nids
[] = {
275 NID_netscape_cert_type
, /* 71 */
276 NID_key_usage
, /* 83 */
277 NID_subject_alt_name
, /* 85 */
278 NID_basic_constraints
, /* 87 */
279 NID_certificate_policies
, /* 89 */
280 NID_crl_distribution_points
, /* 103 */
281 NID_ext_key_usage
, /* 126 */
282 #ifndef OPENSSL_NO_RFC3779
283 NID_sbgp_ipAddrBlock
, /* 290 */
284 NID_sbgp_autonomousSysNum
, /* 291 */
286 NID_policy_constraints
, /* 401 */
287 NID_proxyCertInfo
, /* 663 */
288 NID_name_constraints
, /* 666 */
289 NID_policy_mappings
, /* 747 */
290 NID_inhibit_any_policy
/* 748 */
293 int ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
295 if (ex_nid
== NID_undef
)
298 if (OBJ_bsearch_nid(&ex_nid
, supported_nids
, OSSL_NELEM(supported_nids
)))
303 static void setup_dp(X509
*x
, DIST_POINT
*dp
)
305 X509_NAME
*iname
= NULL
;
308 if (dp
->reasons
->length
> 0)
309 dp
->dp_reasons
= dp
->reasons
->data
[0];
310 if (dp
->reasons
->length
> 1)
311 dp
->dp_reasons
|= (dp
->reasons
->data
[1] << 8);
312 dp
->dp_reasons
&= CRLDP_ALL_REASONS
;
314 dp
->dp_reasons
= CRLDP_ALL_REASONS
;
315 if (!dp
->distpoint
|| (dp
->distpoint
->type
!= 1))
317 for (i
= 0; i
< sk_GENERAL_NAME_num(dp
->CRLissuer
); i
++) {
318 GENERAL_NAME
*gen
= sk_GENERAL_NAME_value(dp
->CRLissuer
, i
);
319 if (gen
->type
== GEN_DIRNAME
) {
320 iname
= gen
->d
.directoryName
;
325 iname
= X509_get_issuer_name(x
);
327 DIST_POINT_set_dpname(dp
->distpoint
, iname
);
331 static void setup_crldp(X509
*x
)
334 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, NULL
, NULL
);
335 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++)
336 setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
));
339 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
340 #define ku_reject(x, usage) \
341 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
342 #define xku_reject(x, usage) \
343 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
344 #define ns_reject(x, usage) \
345 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
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
;
358 /* fast lock-free check, see end of the function for details. */
359 if (tsan_ld_acq((TSAN_QUALIFIER
int *)&x
->ex_cached
))
363 CRYPTO_THREAD_write_lock(x
->lock
);
364 if (x
->ex_flags
& EXFLAG_SET
) {
365 CRYPTO_THREAD_unlock(x
->lock
);
369 X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
);
370 /* V1 should mean no extensions ... */
371 if (!X509_get_version(x
))
372 x
->ex_flags
|= EXFLAG_V1
;
373 /* Handle basic constraints */
374 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, NULL
, NULL
))) {
376 x
->ex_flags
|= EXFLAG_CA
;
378 if ((bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
)
380 x
->ex_flags
|= EXFLAG_INVALID
;
383 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
386 BASIC_CONSTRAINTS_free(bs
);
387 x
->ex_flags
|= EXFLAG_BCONS
;
389 /* Handle proxy certificates */
390 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, NULL
, NULL
))) {
391 if (x
->ex_flags
& EXFLAG_CA
392 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
393 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
394 x
->ex_flags
|= EXFLAG_INVALID
;
396 if (pci
->pcPathLengthConstraint
) {
397 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
399 x
->ex_pcpathlen
= -1;
400 PROXY_CERT_INFO_EXTENSION_free(pci
);
401 x
->ex_flags
|= EXFLAG_PROXY
;
403 /* Handle key usage */
404 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, NULL
, NULL
))) {
405 if (usage
->length
> 0) {
406 x
->ex_kusage
= usage
->data
[0];
407 if (usage
->length
> 1)
408 x
->ex_kusage
|= usage
->data
[1] << 8;
411 x
->ex_flags
|= EXFLAG_KUSAGE
;
412 ASN1_BIT_STRING_free(usage
);
415 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, NULL
, NULL
))) {
416 x
->ex_flags
|= EXFLAG_XKUSAGE
;
417 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
418 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
419 case NID_server_auth
:
420 x
->ex_xkusage
|= XKU_SSL_SERVER
;
423 case NID_client_auth
:
424 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
427 case NID_email_protect
:
428 x
->ex_xkusage
|= XKU_SMIME
;
432 x
->ex_xkusage
|= XKU_CODE_SIGN
;
437 x
->ex_xkusage
|= XKU_SGC
;
441 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
445 x
->ex_xkusage
|= XKU_TIMESTAMP
;
449 x
->ex_xkusage
|= XKU_DVCS
;
452 case NID_anyExtendedKeyUsage
:
453 x
->ex_xkusage
|= XKU_ANYEKU
;
457 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
460 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, NULL
, NULL
))) {
462 x
->ex_nscert
= ns
->data
[0];
465 x
->ex_flags
|= EXFLAG_NSCERT
;
466 ASN1_BIT_STRING_free(ns
);
468 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, NULL
, NULL
);
469 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, NULL
, NULL
);
470 /* Does subject name match issuer ? */
471 if (!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
))) {
472 x
->ex_flags
|= EXFLAG_SI
;
473 /* If SKID matches AKID also indicate self signed */
474 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
&&
475 !ku_reject(x
, KU_KEY_CERT_SIGN
))
476 x
->ex_flags
|= EXFLAG_SS
;
478 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, NULL
, NULL
);
479 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
480 if (!x
->nc
&& (i
!= -1))
481 x
->ex_flags
|= EXFLAG_INVALID
;
484 #ifndef OPENSSL_NO_RFC3779
485 x
->rfc3779_addr
= X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, NULL
, NULL
);
486 x
->rfc3779_asid
= X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
,
489 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
490 ex
= X509_get_ext(x
, i
);
491 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex
))
493 x
->ex_flags
|= EXFLAG_FRESHEST
;
494 if (!X509_EXTENSION_get_critical(ex
))
496 if (!X509_supported_extension(ex
)) {
497 x
->ex_flags
|= EXFLAG_CRITICAL
;
501 x509_init_sig_info(x
);
502 x
->ex_flags
|= EXFLAG_SET
;
504 tsan_st_rel((TSAN_QUALIFIER
int *)&x
->ex_cached
, 1);
506 * Above store triggers fast lock-free check in the beginning of the
507 * function. But one has to ensure that the structure is "stable", i.e.
508 * all stores are visible on all processors. Hence the release fence.
511 CRYPTO_THREAD_unlock(x
->lock
);
515 * CA checks common to all purposes
519 * 2 basicConstraints absent so "maybe" a CA
520 * 3 basicConstraints absent but self signed V1.
521 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
524 static int check_ca(const X509
*x
)
526 /* keyUsage if present should allow cert signing */
527 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
529 if (x
->ex_flags
& EXFLAG_BCONS
) {
530 if (x
->ex_flags
& EXFLAG_CA
)
532 /* If basicConstraints says not a CA then say so */
536 /* we support V1 roots for... uh, I don't really know why. */
537 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
540 * If key usage present it must have certSign so tolerate it
542 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
544 /* Older certificates could have Netscape-specific CA types */
545 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
547 /* can this still be regarded a CA certificate? I doubt it */
552 void X509_set_proxy_flag(X509
*x
)
554 x
->ex_flags
|= EXFLAG_PROXY
;
557 void X509_set_proxy_pathlen(X509
*x
, long l
)
562 int X509_check_ca(X509
*x
)
564 x509v3_cache_extensions(x
);
569 /* Check SSL CA: common checks for SSL client and server */
570 static int check_ssl_ca(const X509
*x
)
573 ca_ret
= check_ca(x
);
576 /* check nsCertType if present */
577 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
)
583 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
586 if (xku_reject(x
, XKU_SSL_CLIENT
))
589 return check_ssl_ca(x
);
590 /* We need to do digital signatures or key agreement */
591 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
593 /* nsCertType if present should allow SSL client use */
594 if (ns_reject(x
, NS_SSL_CLIENT
))
600 * Key usage needed for TLS/SSL server: digital signature, encipherment or
601 * key agreement. The ssl code can check this more thoroughly for individual
605 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
607 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
610 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
613 return check_ssl_ca(x
);
615 if (ns_reject(x
, NS_SSL_SERVER
))
617 if (ku_reject(x
, KU_TLS
))
624 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
628 ret
= check_purpose_ssl_server(xp
, x
, ca
);
631 /* We need to encipher or Netscape complains */
632 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
637 /* common S/MIME checks */
638 static int purpose_smime(const X509
*x
, int ca
)
640 if (xku_reject(x
, XKU_SMIME
))
644 ca_ret
= check_ca(x
);
647 /* check nsCertType if present */
648 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
653 if (x
->ex_flags
& EXFLAG_NSCERT
) {
654 if (x
->ex_nscert
& NS_SMIME
)
656 /* Workaround for some buggy certificates */
657 if (x
->ex_nscert
& NS_SSL_CLIENT
)
664 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
668 ret
= purpose_smime(x
, ca
);
671 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
676 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
680 ret
= purpose_smime(x
, ca
);
683 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
688 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
693 if ((ca_ret
= check_ca(x
)) != 2)
698 if (ku_reject(x
, KU_CRL_SIGN
))
704 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
705 * is valid. Additional checks must be made on the chain.
708 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
711 * Must be a valid CA. Should we really support the "I don't know" value
716 /* leaf certificate is checked in OCSP_verify() */
720 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
725 /* If ca is true we must return if this is a valid CA certificate. */
730 * Check the optional key usage field:
731 * if Key Usage is present, it must be one of digitalSignature
732 * and/or nonRepudiation (other values are not consistent and shall
735 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
736 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
737 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
740 /* Only time stamp key usage is permitted and it's required. */
741 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
744 /* Extended Key Usage MUST be critical */
745 i_ext
= X509_get_ext_by_NID(x
, NID_ext_key_usage
, -1);
747 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
748 if (!X509_EXTENSION_get_critical(ext
))
755 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
761 * Various checks to see if one certificate issued the second.
762 * This can be used to prune a set of possible issuer certificates
763 * which have been looked up using some simple method such as by
766 * 1. Check issuer_name(subject) == subject_name(issuer)
767 * 2. If akid(subject) exists, check that it matches issuer
768 * 3. Check that issuer public key algorithm matches subject signature algorithm
769 * 4. If key_usage(issuer) exists, check that it supports certificate signing
770 * returns 0 for OK, positive for reason for mismatch, reasons match
771 * codes for X509_verify_cert()
774 int X509_check_issued(X509
*issuer
, X509
*subject
)
776 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
777 X509_get_issuer_name(subject
)))
778 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
780 x509v3_cache_extensions(issuer
);
781 x509v3_cache_extensions(subject
);
784 int ret
= X509_check_akid(issuer
, subject
->akid
);
785 if (ret
!= X509_V_OK
)
791 * Check if the subject signature algorithm matches the issuer's PUBKEY
794 EVP_PKEY
*i_pkey
= X509_get0_pubkey(issuer
);
795 X509_ALGOR
*s_algor
= &subject
->cert_info
.signature
;
796 int s_pknid
= NID_undef
, s_mdnid
= NID_undef
;
799 return X509_V_ERR_NO_ISSUER_PUBLIC_KEY
;
801 if (!OBJ_find_sigid_algs(OBJ_obj2nid(s_algor
->algorithm
),
803 || EVP_PKEY_type(s_pknid
) != EVP_PKEY_base_id(i_pkey
))
804 return X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH
;
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
;
854 uint32_t X509_get_extension_flags(X509
*x
)
856 /* Call for side-effect of computing hash and caching extensions */
857 X509_check_purpose(x
, -1, -1);
861 uint32_t X509_get_key_usage(X509
*x
)
863 /* Call for side-effect of computing hash and caching extensions */
864 X509_check_purpose(x
, -1, -1);
865 if (x
->ex_flags
& EXFLAG_KUSAGE
)
870 uint32_t X509_get_extended_key_usage(X509
*x
)
872 /* Call for side-effect of computing hash and caching extensions */
873 X509_check_purpose(x
, -1, -1);
874 if (x
->ex_flags
& EXFLAG_XKUSAGE
)
875 return x
->ex_xkusage
;
879 const ASN1_OCTET_STRING
*X509_get0_subject_key_id(X509
*x
)
881 /* Call for side-effect of computing hash and caching extensions */
882 X509_check_purpose(x
, -1, -1);
886 const ASN1_OCTET_STRING
*X509_get0_authority_key_id(X509
*x
)
888 /* Call for side-effect of computing hash and caching extensions */
889 X509_check_purpose(x
, -1, -1);
890 return (x
->akid
!= NULL
? x
->akid
->keyid
: NULL
);
893 const GENERAL_NAMES
*X509_get0_authority_issuer(X509
*x
)
895 /* Call for side-effect of computing hash and caching extensions */
896 X509_check_purpose(x
, -1, -1);
897 return (x
->akid
!= NULL
? x
->akid
->issuer
: NULL
);
900 const ASN1_INTEGER
*X509_get0_authority_serial(X509
*x
)
902 /* Call for side-effect of computing hash and caching extensions */
903 X509_check_purpose(x
, -1, -1);
904 return (x
->akid
!= NULL
? x
->akid
->serial
: NULL
);
907 long X509_get_pathlen(X509
*x
)
909 /* Called for side effect of caching extensions */
910 if (X509_check_purpose(x
, -1, -1) != 1
911 || (x
->ex_flags
& EXFLAG_BCONS
) == 0)
913 return x
->ex_pathlen
;
916 long X509_get_proxy_pathlen(X509
*x
)
918 /* Called for side effect of caching extensions */
919 if (X509_check_purpose(x
, -1, -1) != 1
920 || (x
->ex_flags
& EXFLAG_PROXY
) == 0)
922 return x
->ex_pcpathlen
;