2 * Copyright 1999-2020 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 int check_ssl_ca(const X509
*x
);
19 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
21 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
23 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
25 static int purpose_smime(const X509
*x
, int ca
);
26 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
28 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
30 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
32 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
34 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
35 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
);
37 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
);
38 static void xptable_free(X509_PURPOSE
*p
);
40 static X509_PURPOSE xstandard
[] = {
41 {X509_PURPOSE_SSL_CLIENT
, X509_TRUST_SSL_CLIENT
, 0,
42 check_purpose_ssl_client
, "SSL client", "sslclient", NULL
},
43 {X509_PURPOSE_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
44 check_purpose_ssl_server
, "SSL server", "sslserver", NULL
},
45 {X509_PURPOSE_NS_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
46 check_purpose_ns_ssl_server
, "Netscape SSL server", "nssslserver", NULL
},
47 {X509_PURPOSE_SMIME_SIGN
, X509_TRUST_EMAIL
, 0, check_purpose_smime_sign
,
48 "S/MIME signing", "smimesign", NULL
},
49 {X509_PURPOSE_SMIME_ENCRYPT
, X509_TRUST_EMAIL
, 0,
50 check_purpose_smime_encrypt
, "S/MIME encryption", "smimeencrypt", NULL
},
51 {X509_PURPOSE_CRL_SIGN
, X509_TRUST_COMPAT
, 0, check_purpose_crl_sign
,
52 "CRL signing", "crlsign", NULL
},
53 {X509_PURPOSE_ANY
, X509_TRUST_DEFAULT
, 0, no_check
, "Any Purpose", "any",
55 {X509_PURPOSE_OCSP_HELPER
, X509_TRUST_COMPAT
, 0, ocsp_helper
,
56 "OCSP helper", "ocsphelper", NULL
},
57 {X509_PURPOSE_TIMESTAMP_SIGN
, X509_TRUST_TSA
, 0,
58 check_purpose_timestamp_sign
, "Time Stamp signing", "timestampsign",
62 #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
64 static STACK_OF(X509_PURPOSE
) *xptable
= NULL
;
66 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
)
68 return (*a
)->purpose
- (*b
)->purpose
;
72 * As much as I'd like to make X509_check_purpose use a "const" X509* I
73 * really can't because it does recalculate hashes and do other non-const
76 int X509_check_purpose(X509
*x
, int id
, int ca
)
79 const X509_PURPOSE
*pt
;
81 if (!X509v3_cache_extensions(x
, NULL
, NULL
))
84 /* Return if side-effect only call */
87 idx
= X509_PURPOSE_get_by_id(id
);
90 pt
= X509_PURPOSE_get0(idx
);
91 return pt
->check_purpose(pt
, x
, ca
);
94 int X509_PURPOSE_set(int *p
, int purpose
)
96 if (X509_PURPOSE_get_by_id(purpose
) == -1) {
97 X509V3err(X509V3_F_X509_PURPOSE_SET
, X509V3_R_INVALID_PURPOSE
);
104 int X509_PURPOSE_get_count(void)
107 return X509_PURPOSE_COUNT
;
108 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
111 X509_PURPOSE
*X509_PURPOSE_get0(int idx
)
115 if (idx
< (int)X509_PURPOSE_COUNT
)
116 return xstandard
+ idx
;
117 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
120 int X509_PURPOSE_get_by_sname(const char *sname
)
124 for (i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
125 xptmp
= X509_PURPOSE_get0(i
);
126 if (strcmp(xptmp
->sname
, sname
) == 0)
132 int X509_PURPOSE_get_by_id(int purpose
)
137 if ((purpose
>= X509_PURPOSE_MIN
) && (purpose
<= X509_PURPOSE_MAX
))
138 return purpose
- X509_PURPOSE_MIN
;
141 tmp
.purpose
= purpose
;
142 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
145 return idx
+ X509_PURPOSE_COUNT
;
148 int X509_PURPOSE_add(int id
, int trust
, int flags
,
149 int (*ck
) (const X509_PURPOSE
*, const X509
*, int),
150 const char *name
, const char *sname
, void *arg
)
155 * This is set according to what we change: application can't set it
157 flags
&= ~X509_PURPOSE_DYNAMIC
;
158 /* This will always be set for application modified trust entries */
159 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
160 /* Get existing entry if any */
161 idx
= X509_PURPOSE_get_by_id(id
);
162 /* Need a new entry */
164 if ((ptmp
= OPENSSL_malloc(sizeof(*ptmp
))) == NULL
) {
165 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
168 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
170 ptmp
= X509_PURPOSE_get0(idx
);
172 /* OPENSSL_free existing name if dynamic */
173 if (ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
174 OPENSSL_free(ptmp
->name
);
175 OPENSSL_free(ptmp
->sname
);
177 /* dup supplied name */
178 ptmp
->name
= OPENSSL_strdup(name
);
179 ptmp
->sname
= OPENSSL_strdup(sname
);
180 if (ptmp
->name
== NULL
|| ptmp
->sname
== NULL
) {
181 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
184 /* Keep the dynamic flag of existing entry */
185 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
186 /* Set all other flags */
187 ptmp
->flags
|= flags
;
191 ptmp
->check_purpose
= ck
;
192 ptmp
->usr_data
= arg
;
194 /* If its a new entry manage the dynamic table */
197 && (xptable
= sk_X509_PURPOSE_new(xp_cmp
)) == NULL
) {
198 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
201 if (!sk_X509_PURPOSE_push(xptable
, ptmp
)) {
202 X509V3err(X509V3_F_X509_PURPOSE_ADD
, ERR_R_MALLOC_FAILURE
);
209 OPENSSL_free(ptmp
->name
);
210 OPENSSL_free(ptmp
->sname
);
216 static void xptable_free(X509_PURPOSE
*p
)
220 if (p
->flags
& X509_PURPOSE_DYNAMIC
) {
221 if (p
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
222 OPENSSL_free(p
->name
);
223 OPENSSL_free(p
->sname
);
229 void X509_PURPOSE_cleanup(void)
231 sk_X509_PURPOSE_pop_free(xptable
, xptable_free
);
235 int X509_PURPOSE_get_id(const X509_PURPOSE
*xp
)
240 char *X509_PURPOSE_get0_name(const X509_PURPOSE
*xp
)
245 char *X509_PURPOSE_get0_sname(const X509_PURPOSE
*xp
)
250 int X509_PURPOSE_get_trust(const X509_PURPOSE
*xp
)
255 static int nid_cmp(const int *a
, const int *b
)
260 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid
);
261 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid
);
263 int X509_supported_extension(X509_EXTENSION
*ex
)
266 * This table is a list of the NIDs of supported extensions: that is
267 * those which are used by the verify process. If an extension is
268 * critical and doesn't appear in this list then the verify process will
269 * normally reject the certificate. The list must be kept in numerical
270 * order because it will be searched using bsearch.
273 static const int supported_nids
[] = {
274 NID_netscape_cert_type
, /* 71 */
275 NID_key_usage
, /* 83 */
276 NID_subject_alt_name
, /* 85 */
277 NID_basic_constraints
, /* 87 */
278 NID_certificate_policies
, /* 89 */
279 NID_crl_distribution_points
, /* 103 */
280 NID_ext_key_usage
, /* 126 */
281 #ifndef OPENSSL_NO_RFC3779
282 NID_sbgp_ipAddrBlock
, /* 290 */
283 NID_sbgp_autonomousSysNum
, /* 291 */
285 NID_policy_constraints
, /* 401 */
286 NID_proxyCertInfo
, /* 663 */
287 NID_name_constraints
, /* 666 */
288 NID_policy_mappings
, /* 747 */
289 NID_inhibit_any_policy
/* 748 */
292 int ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
294 if (ex_nid
== NID_undef
)
297 if (OBJ_bsearch_nid(&ex_nid
, supported_nids
, OSSL_NELEM(supported_nids
)))
302 static int setup_dp(X509
*x
, DIST_POINT
*dp
)
304 const 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 return DIST_POINT_set_dpname(dp
->distpoint
, iname
);
330 static int setup_crldp(X509
*x
)
334 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, &i
, NULL
);
335 if (x
->crldp
== NULL
&& i
!= -1)
337 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++) {
338 if (!setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
)))
344 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
345 #define ku_reject(x, usage) \
346 (((x)->ex_flags & EXFLAG_KUSAGE) && !((x)->ex_kusage & (usage)))
347 #define xku_reject(x, usage) \
348 (((x)->ex_flags & EXFLAG_XKUSAGE) && !((x)->ex_xkusage & (usage)))
349 #define ns_reject(x, usage) \
350 (((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
352 int X509v3_cache_extensions(X509
*x
, OPENSSL_CTX
*libctx
, const char *propq
)
354 BASIC_CONSTRAINTS
*bs
;
355 PROXY_CERT_INFO_EXTENSION
*pci
;
356 ASN1_BIT_STRING
*usage
;
358 EXTENDED_KEY_USAGE
*extusage
;
364 /* fast lock-free check, see end of the function for details. */
365 if (tsan_ld_acq((TSAN_QUALIFIER
int *)&x
->ex_cached
))
366 return (x
->ex_flags
& EXFLAG_INVALID
) == 0;
369 CRYPTO_THREAD_write_lock(x
->lock
);
370 if (x
->ex_flags
& EXFLAG_SET
) {
371 CRYPTO_THREAD_unlock(x
->lock
);
372 return (x
->ex_flags
& EXFLAG_INVALID
) == 0;
375 sha1
= EVP_MD_fetch(libctx
, "SHA1", propq
);
376 if (sha1
== NULL
|| !X509_digest(x
, sha1
, x
->sha1_hash
, NULL
))
377 x
->ex_flags
|= EXFLAG_INVALID
;
380 /* V1 should mean no extensions ... */
381 if (!X509_get_version(x
))
382 x
->ex_flags
|= EXFLAG_V1
;
383 /* Handle basic constraints */
384 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, &i
, NULL
))) {
386 x
->ex_flags
|= EXFLAG_CA
;
388 if (bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
) {
389 x
->ex_flags
|= EXFLAG_INVALID
;
392 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
393 if (!bs
->ca
&& x
->ex_pathlen
!= 0) {
394 x
->ex_flags
|= EXFLAG_INVALID
;
400 BASIC_CONSTRAINTS_free(bs
);
401 x
->ex_flags
|= EXFLAG_BCONS
;
402 } else if (i
!= -1) {
403 x
->ex_flags
|= EXFLAG_INVALID
;
405 /* Handle proxy certificates */
406 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, &i
, NULL
))) {
407 if (x
->ex_flags
& EXFLAG_CA
408 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
409 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
410 x
->ex_flags
|= EXFLAG_INVALID
;
412 if (pci
->pcPathLengthConstraint
) {
413 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
415 x
->ex_pcpathlen
= -1;
416 PROXY_CERT_INFO_EXTENSION_free(pci
);
417 x
->ex_flags
|= EXFLAG_PROXY
;
418 } else if (i
!= -1) {
419 x
->ex_flags
|= EXFLAG_INVALID
;
421 /* Handle key usage */
422 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, &i
, NULL
))) {
423 if (usage
->length
> 0) {
424 x
->ex_kusage
= usage
->data
[0];
425 if (usage
->length
> 1)
426 x
->ex_kusage
|= usage
->data
[1] << 8;
429 x
->ex_flags
|= EXFLAG_KUSAGE
;
430 ASN1_BIT_STRING_free(usage
);
431 } else if (i
!= -1) {
432 x
->ex_flags
|= EXFLAG_INVALID
;
435 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, &i
, NULL
))) {
436 x
->ex_flags
|= EXFLAG_XKUSAGE
;
437 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
438 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
439 case NID_server_auth
:
440 x
->ex_xkusage
|= XKU_SSL_SERVER
;
443 case NID_client_auth
:
444 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
447 case NID_email_protect
:
448 x
->ex_xkusage
|= XKU_SMIME
;
452 x
->ex_xkusage
|= XKU_CODE_SIGN
;
457 x
->ex_xkusage
|= XKU_SGC
;
461 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
465 x
->ex_xkusage
|= XKU_TIMESTAMP
;
469 x
->ex_xkusage
|= XKU_DVCS
;
472 case NID_anyExtendedKeyUsage
:
473 x
->ex_xkusage
|= XKU_ANYEKU
;
477 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
478 } else if (i
!= -1) {
479 x
->ex_flags
|= EXFLAG_INVALID
;
482 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, &i
, NULL
))) {
484 x
->ex_nscert
= ns
->data
[0];
487 x
->ex_flags
|= EXFLAG_NSCERT
;
488 ASN1_BIT_STRING_free(ns
);
489 } else if (i
!= -1) {
490 x
->ex_flags
|= EXFLAG_INVALID
;
492 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, &i
, NULL
);
493 if (x
->skid
== NULL
&& i
!= -1)
494 x
->ex_flags
|= EXFLAG_INVALID
;
495 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, &i
, NULL
);
496 if (x
->akid
== NULL
&& i
!= -1)
497 x
->ex_flags
|= EXFLAG_INVALID
;
498 /* Does subject name match issuer ? */
499 if (!X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
))) {
500 x
->ex_flags
|= EXFLAG_SI
;
501 /* If SKID matches AKID also indicate self signed */
502 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
&&
503 !ku_reject(x
, KU_KEY_CERT_SIGN
))
504 x
->ex_flags
|= EXFLAG_SS
;
506 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, &i
, NULL
);
507 if (x
->altname
== NULL
&& i
!= -1)
508 x
->ex_flags
|= EXFLAG_INVALID
;
509 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
510 if (x
->nc
== NULL
&& i
!= -1)
511 x
->ex_flags
|= EXFLAG_INVALID
;
513 x
->ex_flags
|= EXFLAG_INVALID
;
515 #ifndef OPENSSL_NO_RFC3779
516 x
->rfc3779_addr
= X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, &i
, NULL
);
517 if (x
->rfc3779_addr
== NULL
&& i
!= -1)
518 x
->ex_flags
|= EXFLAG_INVALID
;
519 x
->rfc3779_asid
= X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
, &i
, NULL
);
520 if (x
->rfc3779_asid
== NULL
&& i
!= -1)
521 x
->ex_flags
|= EXFLAG_INVALID
;
523 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
524 ex
= X509_get_ext(x
, i
);
525 if (OBJ_obj2nid(X509_EXTENSION_get_object(ex
))
527 x
->ex_flags
|= EXFLAG_FRESHEST
;
528 if (!X509_EXTENSION_get_critical(ex
))
530 if (!X509_supported_extension(ex
)) {
531 x
->ex_flags
|= EXFLAG_CRITICAL
;
535 x509_init_sig_info(x
);
536 x
->ex_flags
|= EXFLAG_SET
;
538 tsan_st_rel((TSAN_QUALIFIER
int *)&x
->ex_cached
, 1);
540 * Above store triggers fast lock-free check in the beginning of the
541 * function. But one has to ensure that the structure is "stable", i.e.
542 * all stores are visible on all processors. Hence the release fence.
545 CRYPTO_THREAD_unlock(x
->lock
);
547 return (x
->ex_flags
& EXFLAG_INVALID
) == 0;
551 * CA checks common to all purposes
555 * 2 basicConstraints absent so "maybe" a CA
556 * 3 basicConstraints absent but self signed V1.
557 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
560 static int check_ca(const X509
*x
)
562 /* keyUsage if present should allow cert signing */
563 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
565 if (x
->ex_flags
& EXFLAG_BCONS
) {
566 if (x
->ex_flags
& EXFLAG_CA
)
568 /* If basicConstraints says not a CA then say so */
572 /* we support V1 roots for... uh, I don't really know why. */
573 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
576 * If key usage present it must have certSign so tolerate it
578 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
580 /* Older certificates could have Netscape-specific CA types */
581 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
583 /* can this still be regarded a CA certificate? I doubt it */
588 void X509_set_proxy_flag(X509
*x
)
590 x
->ex_flags
|= EXFLAG_PROXY
;
593 void X509_set_proxy_pathlen(X509
*x
, long l
)
598 int X509_check_ca(X509
*x
)
600 /* Note 0 normally means "not a CA" - but in this case means error. */
601 if (!X509v3_cache_extensions(x
, NULL
, NULL
))
607 /* Check SSL CA: common checks for SSL client and server */
608 static int check_ssl_ca(const X509
*x
)
611 ca_ret
= check_ca(x
);
614 /* check nsCertType if present */
615 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SSL_CA
)
621 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
624 if (xku_reject(x
, XKU_SSL_CLIENT
))
627 return check_ssl_ca(x
);
628 /* We need to do digital signatures or key agreement */
629 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
631 /* nsCertType if present should allow SSL client use */
632 if (ns_reject(x
, NS_SSL_CLIENT
))
638 * Key usage needed for TLS/SSL server: digital signature, encipherment or
639 * key agreement. The ssl code can check this more thoroughly for individual
643 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
645 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
648 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
651 return check_ssl_ca(x
);
653 if (ns_reject(x
, NS_SSL_SERVER
))
655 if (ku_reject(x
, KU_TLS
))
662 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
666 ret
= check_purpose_ssl_server(xp
, x
, ca
);
669 /* We need to encipher or Netscape complains */
670 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
675 /* common S/MIME checks */
676 static int purpose_smime(const X509
*x
, int ca
)
678 if (xku_reject(x
, XKU_SMIME
))
682 ca_ret
= check_ca(x
);
685 /* check nsCertType if present */
686 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
691 if (x
->ex_flags
& EXFLAG_NSCERT
) {
692 if (x
->ex_nscert
& NS_SMIME
)
694 /* Workaround for some buggy certificates */
695 if (x
->ex_nscert
& NS_SSL_CLIENT
)
702 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
706 ret
= purpose_smime(x
, ca
);
709 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
714 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
718 ret
= purpose_smime(x
, ca
);
721 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
726 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
731 if ((ca_ret
= check_ca(x
)) != 2)
736 if (ku_reject(x
, KU_CRL_SIGN
))
742 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
743 * is valid. Additional checks must be made on the chain.
746 static int ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
749 * Must be a valid CA. Should we really support the "I don't know" value
754 /* leaf certificate is checked in OCSP_verify() */
758 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
763 /* If ca is true we must return if this is a valid CA certificate. */
768 * Check the optional key usage field:
769 * if Key Usage is present, it must be one of digitalSignature
770 * and/or nonRepudiation (other values are not consistent and shall
773 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
774 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
775 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
778 /* Only time stamp key usage is permitted and it's required. */
779 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
782 /* Extended Key Usage MUST be critical */
783 i_ext
= X509_get_ext_by_NID(x
, NID_ext_key_usage
, -1);
785 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
786 if (!X509_EXTENSION_get_critical(ext
))
793 static int no_check(const X509_PURPOSE
*xp
, const X509
*x
, int ca
)
799 * Various checks to see if one certificate issued the second.
800 * This can be used to prune a set of possible issuer certificates
801 * which have been looked up using some simple method such as by
804 * 1. Check issuer_name(subject) == subject_name(issuer)
805 * 2. If akid(subject) exists, check that it matches issuer
806 * 3. Check that issuer public key algorithm matches subject signature algorithm
807 * 4. If key_usage(issuer) exists, check that it supports certificate signing
808 * returns 0 for OK, positive for reason for mismatch, reasons match
809 * codes for X509_verify_cert()
812 int X509_check_issued(X509
*issuer
, X509
*subject
)
814 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
815 X509_get_issuer_name(subject
)))
816 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
818 if (!X509v3_cache_extensions(issuer
, NULL
, NULL
)
819 || !X509v3_cache_extensions(subject
, NULL
, NULL
))
820 return X509_V_ERR_UNSPECIFIED
;
823 int ret
= X509_check_akid(issuer
, subject
->akid
);
824 if (ret
!= X509_V_OK
)
830 * Check if the subject signature algorithm matches the issuer's PUBKEY
833 EVP_PKEY
*i_pkey
= X509_get0_pubkey(issuer
);
834 X509_ALGOR
*s_algor
= &subject
->cert_info
.signature
;
835 int s_pknid
= NID_undef
, s_mdnid
= NID_undef
;
838 return X509_V_ERR_NO_ISSUER_PUBLIC_KEY
;
840 if (!OBJ_find_sigid_algs(OBJ_obj2nid(s_algor
->algorithm
),
842 || EVP_PKEY_type(s_pknid
) != EVP_PKEY_base_id(i_pkey
))
843 return X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH
;
846 if (subject
->ex_flags
& EXFLAG_PROXY
) {
847 if (ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
848 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
849 } else if (ku_reject(issuer
, KU_KEY_CERT_SIGN
))
850 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
854 int X509_check_akid(X509
*issuer
, AUTHORITY_KEYID
*akid
)
860 /* Check key ids (if present) */
861 if (akid
->keyid
&& issuer
->skid
&&
862 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
))
863 return X509_V_ERR_AKID_SKID_MISMATCH
;
864 /* Check serial number */
866 ASN1_INTEGER_cmp(X509_get_serialNumber(issuer
), akid
->serial
))
867 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
868 /* Check issuer name */
871 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
872 * GeneralName. So look for a DirName. There may be more than one but
873 * we only take any notice of the first.
877 X509_NAME
*nm
= NULL
;
880 for (i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++) {
881 gen
= sk_GENERAL_NAME_value(gens
, i
);
882 if (gen
->type
== GEN_DIRNAME
) {
887 if (nm
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)))
888 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
893 uint32_t X509_get_extension_flags(X509
*x
)
895 /* Call for side-effect of computing hash and caching extensions */
896 X509_check_purpose(x
, -1, -1);
900 uint32_t X509_get_key_usage(X509
*x
)
902 /* Call for side-effect of computing hash and caching extensions */
903 if (X509_check_purpose(x
, -1, -1) != 1)
905 if (x
->ex_flags
& EXFLAG_KUSAGE
)
910 uint32_t X509_get_extended_key_usage(X509
*x
)
912 /* Call for side-effect of computing hash and caching extensions */
913 if (X509_check_purpose(x
, -1, -1) != 1)
915 if (x
->ex_flags
& EXFLAG_XKUSAGE
)
916 return x
->ex_xkusage
;
920 const ASN1_OCTET_STRING
*X509_get0_subject_key_id(X509
*x
)
922 /* Call for side-effect of computing hash and caching extensions */
923 if (X509_check_purpose(x
, -1, -1) != 1)
928 const ASN1_OCTET_STRING
*X509_get0_authority_key_id(X509
*x
)
930 /* Call for side-effect of computing hash and caching extensions */
931 if (X509_check_purpose(x
, -1, -1) != 1)
933 return (x
->akid
!= NULL
? x
->akid
->keyid
: NULL
);
936 const GENERAL_NAMES
*X509_get0_authority_issuer(X509
*x
)
938 /* Call for side-effect of computing hash and caching extensions */
939 if (X509_check_purpose(x
, -1, -1) != 1)
941 return (x
->akid
!= NULL
? x
->akid
->issuer
: NULL
);
944 const ASN1_INTEGER
*X509_get0_authority_serial(X509
*x
)
946 /* Call for side-effect of computing hash and caching extensions */
947 if (X509_check_purpose(x
, -1, -1) != 1)
949 return (x
->akid
!= NULL
? x
->akid
->serial
: NULL
);
952 long X509_get_pathlen(X509
*x
)
954 /* Called for side effect of caching extensions */
955 if (X509_check_purpose(x
, -1, -1) != 1
956 || (x
->ex_flags
& EXFLAG_BCONS
) == 0)
958 return x
->ex_pathlen
;
961 long X509_get_proxy_pathlen(X509
*x
)
963 /* Called for side effect of caching extensions */
964 if (X509_check_purpose(x
, -1, -1) != 1
965 || (x
->ex_flags
& EXFLAG_PROXY
) == 0)
967 return x
->ex_pcpathlen
;