2 * Copyright 1999-2021 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"
17 #include "x509_local.h"
19 static int check_ssl_ca(const X509
*x
);
20 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
22 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
24 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
26 static int purpose_smime(const X509
*x
, int require_ca
);
27 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
29 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
31 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
33 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
35 static int no_check_purpose(const X509_PURPOSE
*xp
, const X509
*x
,
37 static int check_purpose_ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
,
40 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
);
41 static void xptable_free(X509_PURPOSE
*p
);
43 static X509_PURPOSE xstandard
[] = {
44 {X509_PURPOSE_SSL_CLIENT
, X509_TRUST_SSL_CLIENT
, 0,
45 check_purpose_ssl_client
, "SSL client", "sslclient", NULL
},
46 {X509_PURPOSE_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
47 check_purpose_ssl_server
, "SSL server", "sslserver", NULL
},
48 {X509_PURPOSE_NS_SSL_SERVER
, X509_TRUST_SSL_SERVER
, 0,
49 check_purpose_ns_ssl_server
, "Netscape SSL server", "nssslserver", NULL
},
50 {X509_PURPOSE_SMIME_SIGN
, X509_TRUST_EMAIL
, 0, check_purpose_smime_sign
,
51 "S/MIME signing", "smimesign", NULL
},
52 {X509_PURPOSE_SMIME_ENCRYPT
, X509_TRUST_EMAIL
, 0,
53 check_purpose_smime_encrypt
, "S/MIME encryption", "smimeencrypt", NULL
},
54 {X509_PURPOSE_CRL_SIGN
, X509_TRUST_COMPAT
, 0, check_purpose_crl_sign
,
55 "CRL signing", "crlsign", NULL
},
56 {X509_PURPOSE_ANY
, X509_TRUST_DEFAULT
, 0, no_check_purpose
,
59 {X509_PURPOSE_OCSP_HELPER
, X509_TRUST_COMPAT
, 0, check_purpose_ocsp_helper
,
60 "OCSP helper", "ocsphelper", NULL
},
61 {X509_PURPOSE_TIMESTAMP_SIGN
, X509_TRUST_TSA
, 0,
62 check_purpose_timestamp_sign
, "Time Stamp signing", "timestampsign",
66 #define X509_PURPOSE_COUNT OSSL_NELEM(xstandard)
68 static STACK_OF(X509_PURPOSE
) *xptable
= NULL
;
70 static int xp_cmp(const X509_PURPOSE
*const *a
, const X509_PURPOSE
*const *b
)
72 return (*a
)->purpose
- (*b
)->purpose
;
76 * As much as I'd like to make X509_check_purpose use a "const" X509* I really
77 * can't because it does recalculate hashes and do other non-const things.
78 * If id == -1 it just calls x509v3_cache_extensions() for its side-effect.
79 * Returns 1 on success, 0 if x does not allow purpose, -1 on (internal) error.
81 int X509_check_purpose(X509
*x
, int id
, int require_ca
)
84 const X509_PURPOSE
*pt
;
86 if (!ossl_x509v3_cache_extensions(x
))
91 idx
= X509_PURPOSE_get_by_id(id
);
94 pt
= X509_PURPOSE_get0(idx
);
95 return pt
->check_purpose(pt
, x
, require_ca
);
98 int X509_PURPOSE_set(int *p
, int purpose
)
100 if (X509_PURPOSE_get_by_id(purpose
) == -1) {
101 ERR_raise(ERR_LIB_X509V3
, X509V3_R_INVALID_PURPOSE
);
108 int X509_PURPOSE_get_count(void)
111 return X509_PURPOSE_COUNT
;
112 return sk_X509_PURPOSE_num(xptable
) + X509_PURPOSE_COUNT
;
115 X509_PURPOSE
*X509_PURPOSE_get0(int idx
)
119 if (idx
< (int)X509_PURPOSE_COUNT
)
120 return xstandard
+ idx
;
121 return sk_X509_PURPOSE_value(xptable
, idx
- X509_PURPOSE_COUNT
);
124 int X509_PURPOSE_get_by_sname(const char *sname
)
128 for (i
= 0; i
< X509_PURPOSE_get_count(); i
++) {
129 xptmp
= X509_PURPOSE_get0(i
);
130 if (strcmp(xptmp
->sname
, sname
) == 0)
136 /* Returns -1 on error, else an index => 0 in standard/extended purpose table */
137 int X509_PURPOSE_get_by_id(int purpose
)
142 if (purpose
>= X509_PURPOSE_MIN
&& purpose
<= X509_PURPOSE_MAX
)
143 return purpose
- X509_PURPOSE_MIN
;
146 tmp
.purpose
= purpose
;
147 idx
= sk_X509_PURPOSE_find(xptable
, &tmp
);
150 return idx
+ X509_PURPOSE_COUNT
;
153 int X509_PURPOSE_add(int id
, int trust
, int flags
,
154 int (*ck
) (const X509_PURPOSE
*, const X509
*, int),
155 const char *name
, const char *sname
, void *arg
)
160 /* This is set according to what we change: application can't set it */
161 flags
&= ~X509_PURPOSE_DYNAMIC
;
162 /* This will always be set for application modified trust entries */
163 flags
|= X509_PURPOSE_DYNAMIC_NAME
;
164 /* Get existing entry if any */
165 idx
= X509_PURPOSE_get_by_id(id
);
166 /* Need a new entry */
168 if ((ptmp
= OPENSSL_malloc(sizeof(*ptmp
))) == NULL
) {
169 ERR_raise(ERR_LIB_X509V3
, ERR_R_MALLOC_FAILURE
);
172 ptmp
->flags
= X509_PURPOSE_DYNAMIC
;
174 ptmp
= X509_PURPOSE_get0(idx
);
176 /* OPENSSL_free existing name if dynamic */
177 if (ptmp
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
178 OPENSSL_free(ptmp
->name
);
179 OPENSSL_free(ptmp
->sname
);
181 /* Dup supplied name */
182 ptmp
->name
= OPENSSL_strdup(name
);
183 ptmp
->sname
= OPENSSL_strdup(sname
);
184 if (ptmp
->name
== NULL
|| ptmp
->sname
== NULL
) {
185 ERR_raise(ERR_LIB_X509V3
, ERR_R_MALLOC_FAILURE
);
188 /* Keep the dynamic flag of existing entry */
189 ptmp
->flags
&= X509_PURPOSE_DYNAMIC
;
190 /* Set all other flags */
191 ptmp
->flags
|= flags
;
195 ptmp
->check_purpose
= ck
;
196 ptmp
->usr_data
= arg
;
198 /* If its a new entry manage the dynamic table */
201 && (xptable
= sk_X509_PURPOSE_new(xp_cmp
)) == NULL
) {
202 ERR_raise(ERR_LIB_X509V3
, ERR_R_MALLOC_FAILURE
);
205 if (!sk_X509_PURPOSE_push(xptable
, ptmp
)) {
206 ERR_raise(ERR_LIB_X509V3
, ERR_R_MALLOC_FAILURE
);
213 OPENSSL_free(ptmp
->name
);
214 OPENSSL_free(ptmp
->sname
);
220 static void xptable_free(X509_PURPOSE
*p
)
224 if (p
->flags
& X509_PURPOSE_DYNAMIC
) {
225 if (p
->flags
& X509_PURPOSE_DYNAMIC_NAME
) {
226 OPENSSL_free(p
->name
);
227 OPENSSL_free(p
->sname
);
233 void X509_PURPOSE_cleanup(void)
235 sk_X509_PURPOSE_pop_free(xptable
, xptable_free
);
239 int X509_PURPOSE_get_id(const X509_PURPOSE
*xp
)
244 char *X509_PURPOSE_get0_name(const X509_PURPOSE
*xp
)
249 char *X509_PURPOSE_get0_sname(const X509_PURPOSE
*xp
)
254 int X509_PURPOSE_get_trust(const X509_PURPOSE
*xp
)
259 static int nid_cmp(const int *a
, const int *b
)
264 DECLARE_OBJ_BSEARCH_CMP_FN(int, int, nid
);
265 IMPLEMENT_OBJ_BSEARCH_CMP_FN(int, int, nid
);
267 int X509_supported_extension(X509_EXTENSION
*ex
)
270 * This table is a list of the NIDs of supported extensions: that is
271 * those which are used by the verify process. If an extension is
272 * critical and doesn't appear in this list then the verify process will
273 * normally reject the certificate. The list must be kept in numerical
274 * order because it will be searched using bsearch.
276 static const int supported_nids
[] = {
277 NID_netscape_cert_type
, /* 71 */
278 NID_key_usage
, /* 83 */
279 NID_subject_alt_name
, /* 85 */
280 NID_basic_constraints
, /* 87 */
281 NID_certificate_policies
, /* 89 */
282 NID_crl_distribution_points
, /* 103 */
283 NID_ext_key_usage
, /* 126 */
284 #ifndef OPENSSL_NO_RFC3779
285 NID_sbgp_ipAddrBlock
, /* 290 */
286 NID_sbgp_autonomousSysNum
, /* 291 */
288 NID_id_pkix_OCSP_noCheck
, /* 369 */
289 NID_policy_constraints
, /* 401 */
290 NID_proxyCertInfo
, /* 663 */
291 NID_name_constraints
, /* 666 */
292 NID_policy_mappings
, /* 747 */
293 NID_inhibit_any_policy
/* 748 */
296 int ex_nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
298 if (ex_nid
== NID_undef
)
301 if (OBJ_bsearch_nid(&ex_nid
, supported_nids
, OSSL_NELEM(supported_nids
)))
306 /* Returns 1 on success, 0 if x is invalid, -1 on (internal) error. */
307 static int setup_dp(const X509
*x
, DIST_POINT
*dp
)
309 const X509_NAME
*iname
= NULL
;
312 if (dp
->distpoint
== NULL
&& sk_GENERAL_NAME_num(dp
->CRLissuer
) <= 0) {
313 ERR_raise(ERR_LIB_X509
, X509_R_INVALID_DISTPOINT
);
316 if (dp
->reasons
!= NULL
) {
317 if (dp
->reasons
->length
> 0)
318 dp
->dp_reasons
= dp
->reasons
->data
[0];
319 if (dp
->reasons
->length
> 1)
320 dp
->dp_reasons
|= (dp
->reasons
->data
[1] << 8);
321 dp
->dp_reasons
&= CRLDP_ALL_REASONS
;
323 dp
->dp_reasons
= CRLDP_ALL_REASONS
;
325 if (dp
->distpoint
== NULL
|| dp
->distpoint
->type
!= 1)
328 /* Handle name fragment given by nameRelativeToCRLIssuer */
330 * Note that the below way of determining iname is not really compliant
331 * with https://tools.ietf.org/html/rfc5280#section-4.2.1.13
332 * According to it, sk_GENERAL_NAME_num(dp->CRLissuer) MUST be <= 1
333 * and any CRLissuer could be of type different to GEN_DIRNAME.
335 for (i
= 0; i
< sk_GENERAL_NAME_num(dp
->CRLissuer
); i
++) {
336 GENERAL_NAME
*gen
= sk_GENERAL_NAME_value(dp
->CRLissuer
, i
);
338 if (gen
->type
== GEN_DIRNAME
) {
339 iname
= gen
->d
.directoryName
;
344 iname
= X509_get_issuer_name(x
);
345 return DIST_POINT_set_dpname(dp
->distpoint
, iname
) ? 1 : -1;
348 /* Return 1 on success, 0 if x is invalid, -1 on (internal) error. */
349 static int setup_crldp(X509
*x
)
353 x
->crldp
= X509_get_ext_d2i(x
, NID_crl_distribution_points
, &i
, NULL
);
354 if (x
->crldp
== NULL
&& i
!= -1)
357 for (i
= 0; i
< sk_DIST_POINT_num(x
->crldp
); i
++) {
358 int res
= setup_dp(x
, sk_DIST_POINT_value(x
->crldp
, i
));
366 /* Check that issuer public key algorithm matches subject signature algorithm */
367 static int check_sig_alg_match(const EVP_PKEY
*issuer_key
, const X509
*subject
)
371 if (issuer_key
== NULL
)
372 return X509_V_ERR_NO_ISSUER_PUBLIC_KEY
;
373 if (OBJ_find_sigid_algs(OBJ_obj2nid(subject
->cert_info
.signature
.algorithm
),
374 NULL
, &subj_sig_nid
) == 0)
375 return X509_V_ERR_UNSUPPORTED_SIGNATURE_ALGORITHM
;
376 if (EVP_PKEY_is_a(issuer_key
, OBJ_nid2sn(subj_sig_nid
))
377 || (EVP_PKEY_is_a(issuer_key
, "RSA") && subj_sig_nid
== NID_rsassaPss
))
379 return X509_V_ERR_SIGNATURE_ALGORITHM_MISMATCH
;
382 #define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
383 #define ku_reject(x, usage) \
384 (((x)->ex_flags & EXFLAG_KUSAGE) != 0 && ((x)->ex_kusage & (usage)) == 0)
385 #define xku_reject(x, usage) \
386 (((x)->ex_flags & EXFLAG_XKUSAGE) != 0 && ((x)->ex_xkusage & (usage)) == 0)
387 #define ns_reject(x, usage) \
388 (((x)->ex_flags & EXFLAG_NSCERT) != 0 && ((x)->ex_nscert & (usage)) == 0)
391 * Cache info on various X.509v3 extensions and further derived information,
392 * e.g., if cert 'x' is self-issued, in x->ex_flags and other internal fields.
393 * x->sha1_hash is filled in, or else EXFLAG_NO_FINGERPRINT is set in x->flags.
394 * X509_SIG_INFO_VALID is set in x->flags if x->siginf was filled successfully.
395 * Set EXFLAG_INVALID and return 0 in case the certificate is invalid.
397 int ossl_x509v3_cache_extensions(X509
*x
)
399 BASIC_CONSTRAINTS
*bs
;
400 PROXY_CERT_INFO_EXTENSION
*pci
;
401 ASN1_BIT_STRING
*usage
;
403 EXTENDED_KEY_USAGE
*extusage
;
408 /* Fast lock-free check, see end of the function for details. */
409 if (tsan_ld_acq((TSAN_QUALIFIER
int *)&x
->ex_cached
))
410 return (x
->ex_flags
& EXFLAG_INVALID
) == 0;
413 if (!CRYPTO_THREAD_write_lock(x
->lock
))
415 if (x
->ex_flags
& EXFLAG_SET
) { /* Cert has already been processed */
416 CRYPTO_THREAD_unlock(x
->lock
);
417 return (x
->ex_flags
& EXFLAG_INVALID
) == 0;
420 /* Cache the SHA1 digest of the cert */
421 if (!X509_digest(x
, EVP_sha1(), x
->sha1_hash
, NULL
))
422 x
->ex_flags
|= EXFLAG_NO_FINGERPRINT
;
426 /* V1 should mean no extensions ... */
427 if (X509_get_version(x
) == X509_VERSION_1
)
428 x
->ex_flags
|= EXFLAG_V1
;
430 /* Handle basic constraints */
432 if ((bs
= X509_get_ext_d2i(x
, NID_basic_constraints
, &i
, NULL
)) != NULL
) {
434 x
->ex_flags
|= EXFLAG_CA
;
435 if (bs
->pathlen
!= NULL
) {
437 * The error case !bs->ca is checked by check_chain()
438 * in case ctx->param->flags & X509_V_FLAG_X509_STRICT
440 if (bs
->pathlen
->type
== V_ASN1_NEG_INTEGER
) {
441 ERR_raise(ERR_LIB_X509
, X509V3_R_NEGATIVE_PATHLEN
);
442 x
->ex_flags
|= EXFLAG_INVALID
;
444 x
->ex_pathlen
= ASN1_INTEGER_get(bs
->pathlen
);
447 BASIC_CONSTRAINTS_free(bs
);
448 x
->ex_flags
|= EXFLAG_BCONS
;
449 } else if (i
!= -1) {
450 x
->ex_flags
|= EXFLAG_INVALID
;
453 /* Handle proxy certificates */
454 if ((pci
= X509_get_ext_d2i(x
, NID_proxyCertInfo
, &i
, NULL
)) != NULL
) {
455 if (x
->ex_flags
& EXFLAG_CA
456 || X509_get_ext_by_NID(x
, NID_subject_alt_name
, -1) >= 0
457 || X509_get_ext_by_NID(x
, NID_issuer_alt_name
, -1) >= 0) {
458 x
->ex_flags
|= EXFLAG_INVALID
;
460 if (pci
->pcPathLengthConstraint
!= NULL
)
461 x
->ex_pcpathlen
= ASN1_INTEGER_get(pci
->pcPathLengthConstraint
);
463 x
->ex_pcpathlen
= -1;
464 PROXY_CERT_INFO_EXTENSION_free(pci
);
465 x
->ex_flags
|= EXFLAG_PROXY
;
466 } else if (i
!= -1) {
467 x
->ex_flags
|= EXFLAG_INVALID
;
470 /* Handle (basic) key usage */
471 if ((usage
= X509_get_ext_d2i(x
, NID_key_usage
, &i
, NULL
)) != NULL
) {
473 if (usage
->length
> 0) {
474 x
->ex_kusage
= usage
->data
[0];
475 if (usage
->length
> 1)
476 x
->ex_kusage
|= usage
->data
[1] << 8;
478 x
->ex_flags
|= EXFLAG_KUSAGE
;
479 ASN1_BIT_STRING_free(usage
);
480 /* Check for empty key usage according to RFC 5280 section 4.2.1.3 */
481 if (x
->ex_kusage
== 0) {
482 ERR_raise(ERR_LIB_X509
, X509V3_R_EMPTY_KEY_USAGE
);
483 x
->ex_flags
|= EXFLAG_INVALID
;
485 } else if (i
!= -1) {
486 x
->ex_flags
|= EXFLAG_INVALID
;
489 /* Handle extended key usage */
491 if ((extusage
= X509_get_ext_d2i(x
, NID_ext_key_usage
, &i
, NULL
)) != NULL
) {
492 x
->ex_flags
|= EXFLAG_XKUSAGE
;
493 for (i
= 0; i
< sk_ASN1_OBJECT_num(extusage
); i
++) {
494 switch (OBJ_obj2nid(sk_ASN1_OBJECT_value(extusage
, i
))) {
495 case NID_server_auth
:
496 x
->ex_xkusage
|= XKU_SSL_SERVER
;
498 case NID_client_auth
:
499 x
->ex_xkusage
|= XKU_SSL_CLIENT
;
501 case NID_email_protect
:
502 x
->ex_xkusage
|= XKU_SMIME
;
505 x
->ex_xkusage
|= XKU_CODE_SIGN
;
509 x
->ex_xkusage
|= XKU_SGC
;
512 x
->ex_xkusage
|= XKU_OCSP_SIGN
;
515 x
->ex_xkusage
|= XKU_TIMESTAMP
;
518 x
->ex_xkusage
|= XKU_DVCS
;
520 case NID_anyExtendedKeyUsage
:
521 x
->ex_xkusage
|= XKU_ANYEKU
;
524 /* Ignore unknown extended key usage */
528 sk_ASN1_OBJECT_pop_free(extusage
, ASN1_OBJECT_free
);
529 } else if (i
!= -1) {
530 x
->ex_flags
|= EXFLAG_INVALID
;
533 /* Handle legacy Netscape extension */
534 if ((ns
= X509_get_ext_d2i(x
, NID_netscape_cert_type
, &i
, NULL
)) != NULL
) {
536 x
->ex_nscert
= ns
->data
[0];
539 x
->ex_flags
|= EXFLAG_NSCERT
;
540 ASN1_BIT_STRING_free(ns
);
541 } else if (i
!= -1) {
542 x
->ex_flags
|= EXFLAG_INVALID
;
545 /* Handle subject key identifier and issuer/authority key identifier */
546 x
->skid
= X509_get_ext_d2i(x
, NID_subject_key_identifier
, &i
, NULL
);
547 if (x
->skid
== NULL
&& i
!= -1)
548 x
->ex_flags
|= EXFLAG_INVALID
;
550 x
->akid
= X509_get_ext_d2i(x
, NID_authority_key_identifier
, &i
, NULL
);
551 if (x
->akid
== NULL
&& i
!= -1)
552 x
->ex_flags
|= EXFLAG_INVALID
;
554 /* Check if subject name matches issuer */
555 if (X509_NAME_cmp(X509_get_subject_name(x
), X509_get_issuer_name(x
)) == 0) {
556 x
->ex_flags
|= EXFLAG_SI
; /* Cert is self-issued */
557 if (X509_check_akid(x
, x
->akid
) == X509_V_OK
/* SKID matches AKID */
558 /* .. and the signature alg matches the PUBKEY alg: */
559 && check_sig_alg_match(X509_get0_pubkey(x
), x
) == X509_V_OK
)
560 x
->ex_flags
|= EXFLAG_SS
; /* indicate self-signed */
561 /* This is very related to ossl_x509_likely_issued(x, x) == X509_V_OK */
564 /* Handle subject alternative names and various other extensions */
565 x
->altname
= X509_get_ext_d2i(x
, NID_subject_alt_name
, &i
, NULL
);
566 if (x
->altname
== NULL
&& i
!= -1)
567 x
->ex_flags
|= EXFLAG_INVALID
;
568 x
->nc
= X509_get_ext_d2i(x
, NID_name_constraints
, &i
, NULL
);
569 if (x
->nc
== NULL
&& i
!= -1)
570 x
->ex_flags
|= EXFLAG_INVALID
;
572 /* Handle CRL distribution point entries */
573 res
= setup_crldp(x
);
575 x
->ex_flags
|= EXFLAG_INVALID
;
579 #ifndef OPENSSL_NO_RFC3779
580 x
->rfc3779_addr
= X509_get_ext_d2i(x
, NID_sbgp_ipAddrBlock
, &i
, NULL
);
581 if (x
->rfc3779_addr
== NULL
&& i
!= -1)
582 x
->ex_flags
|= EXFLAG_INVALID
;
583 x
->rfc3779_asid
= X509_get_ext_d2i(x
, NID_sbgp_autonomousSysNum
, &i
, NULL
);
584 if (x
->rfc3779_asid
== NULL
&& i
!= -1)
585 x
->ex_flags
|= EXFLAG_INVALID
;
587 for (i
= 0; i
< X509_get_ext_count(x
); i
++) {
588 X509_EXTENSION
*ex
= X509_get_ext(x
, i
);
589 int nid
= OBJ_obj2nid(X509_EXTENSION_get_object(ex
));
591 if (nid
== NID_freshest_crl
)
592 x
->ex_flags
|= EXFLAG_FRESHEST
;
593 if (!X509_EXTENSION_get_critical(ex
))
595 if (!X509_supported_extension(ex
)) {
596 x
->ex_flags
|= EXFLAG_CRITICAL
;
600 case NID_basic_constraints
:
601 x
->ex_flags
|= EXFLAG_BCONS_CRITICAL
;
603 case NID_authority_key_identifier
:
604 x
->ex_flags
|= EXFLAG_AKID_CRITICAL
;
606 case NID_subject_key_identifier
:
607 x
->ex_flags
|= EXFLAG_SKID_CRITICAL
;
609 case NID_subject_alt_name
:
610 x
->ex_flags
|= EXFLAG_SAN_CRITICAL
;
617 /* Set x->siginf, ignoring errors due to unsupported algos */
618 (void)ossl_x509_init_sig_info(x
);
620 x
->ex_flags
|= EXFLAG_SET
; /* Indicate that cert has been processed */
622 tsan_st_rel((TSAN_QUALIFIER
int *)&x
->ex_cached
, 1);
624 * Above store triggers fast lock-free check in the beginning of the
625 * function. But one has to ensure that the structure is "stable", i.e.
626 * all stores are visible on all processors. Hence the release fence.
630 if ((x
->ex_flags
& (EXFLAG_INVALID
| EXFLAG_NO_FINGERPRINT
)) == 0) {
631 CRYPTO_THREAD_unlock(x
->lock
);
634 if ((x
->ex_flags
& EXFLAG_INVALID
) != 0)
635 ERR_raise(ERR_LIB_X509
, X509V3_R_INVALID_CERTIFICATE
);
636 /* If computing sha1_hash failed the error queue already reflects this. */
639 x
->ex_flags
|= EXFLAG_SET
; /* indicate that cert has been processed */
640 CRYPTO_THREAD_unlock(x
->lock
);
645 * CA checks common to all purposes
649 * 2 Only possible in older versions of openSSL when basicConstraints are absent
650 * new versions will not return this value. May be a CA
651 * 3 basicConstraints absent but self-signed V1.
652 * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
653 * 5 Netscape specific CA Flags present
656 static int check_ca(const X509
*x
)
658 /* keyUsage if present should allow cert signing */
659 if (ku_reject(x
, KU_KEY_CERT_SIGN
))
661 if ((x
->ex_flags
& EXFLAG_BCONS
) != 0) {
662 /* If basicConstraints says not a CA then say so */
663 return (x
->ex_flags
& EXFLAG_CA
) != 0;
665 /* We support V1 roots for... uh, I don't really know why. */
666 if ((x
->ex_flags
& V1_ROOT
) == V1_ROOT
)
669 * If key usage present it must have certSign so tolerate it
671 else if (x
->ex_flags
& EXFLAG_KUSAGE
)
673 /* Older certificates could have Netscape-specific CA types */
674 else if (x
->ex_flags
& EXFLAG_NSCERT
&& x
->ex_nscert
& NS_ANY_CA
)
676 /* Can this still be regarded a CA certificate? I doubt it. */
681 void X509_set_proxy_flag(X509
*x
)
683 if (CRYPTO_THREAD_write_lock(x
->lock
)) {
684 x
->ex_flags
|= EXFLAG_PROXY
;
685 CRYPTO_THREAD_unlock(x
->lock
);
689 void X509_set_proxy_pathlen(X509
*x
, long l
)
694 int X509_check_ca(X509
*x
)
696 /* Note 0 normally means "not a CA" - but in this case means error. */
697 if (!ossl_x509v3_cache_extensions(x
))
703 /* Check SSL CA: common checks for SSL client and server. */
704 static int check_ssl_ca(const X509
*x
)
706 int ca_ret
= check_ca(x
);
710 /* Check nsCertType if present */
711 return ca_ret
!= 5 || (x
->ex_nscert
& NS_SSL_CA
) != 0;
714 static int check_purpose_ssl_client(const X509_PURPOSE
*xp
, const X509
*x
,
717 if (xku_reject(x
, XKU_SSL_CLIENT
))
720 return check_ssl_ca(x
);
721 /* We need to do digital signatures or key agreement */
722 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_KEY_AGREEMENT
))
724 /* nsCertType if present should allow SSL client use */
725 if (ns_reject(x
, NS_SSL_CLIENT
))
731 * Key usage needed for TLS/SSL server: digital signature, encipherment or
732 * key agreement. The ssl code can check this more thoroughly for individual
736 KU_DIGITAL_SIGNATURE|KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT
738 static int check_purpose_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
741 if (xku_reject(x
, XKU_SSL_SERVER
| XKU_SGC
))
744 return check_ssl_ca(x
);
746 if (ns_reject(x
, NS_SSL_SERVER
))
748 if (ku_reject(x
, KU_TLS
))
755 static int check_purpose_ns_ssl_server(const X509_PURPOSE
*xp
, const X509
*x
,
759 ret
= check_purpose_ssl_server(xp
, x
, require_ca
);
760 if (!ret
|| require_ca
)
762 /* We need to encipher or Netscape complains */
763 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
768 /* common S/MIME checks */
769 static int purpose_smime(const X509
*x
, int require_ca
)
771 if (xku_reject(x
, XKU_SMIME
))
775 ca_ret
= check_ca(x
);
778 /* Check nsCertType if present */
779 if (ca_ret
!= 5 || x
->ex_nscert
& NS_SMIME_CA
)
784 if (x
->ex_flags
& EXFLAG_NSCERT
) {
785 if (x
->ex_nscert
& NS_SMIME
)
787 /* Workaround for some buggy certificates */
788 if (x
->ex_nscert
& NS_SSL_CLIENT
)
795 static int check_purpose_smime_sign(const X509_PURPOSE
*xp
, const X509
*x
,
799 ret
= purpose_smime(x
, require_ca
);
800 if (!ret
|| require_ca
)
802 if (ku_reject(x
, KU_DIGITAL_SIGNATURE
| KU_NON_REPUDIATION
))
807 static int check_purpose_smime_encrypt(const X509_PURPOSE
*xp
, const X509
*x
,
811 ret
= purpose_smime(x
, require_ca
);
812 if (!ret
|| require_ca
)
814 if (ku_reject(x
, KU_KEY_ENCIPHERMENT
))
819 static int check_purpose_crl_sign(const X509_PURPOSE
*xp
, const X509
*x
,
824 if ((ca_ret
= check_ca(x
)) != 2)
829 if (ku_reject(x
, KU_CRL_SIGN
))
835 * OCSP helper: this is *not* a full OCSP check. It just checks that each CA
836 * is valid. Additional checks must be made on the chain.
838 static int check_purpose_ocsp_helper(const X509_PURPOSE
*xp
, const X509
*x
,
842 * Must be a valid CA. Should we really support the "I don't know" value
847 /* Leaf certificate is checked in OCSP_verify() */
851 static int check_purpose_timestamp_sign(const X509_PURPOSE
*xp
, const X509
*x
,
856 /* If ca is true we must return if this is a valid CA certificate. */
861 * Check the optional key usage field:
862 * if Key Usage is present, it must be one of digitalSignature
863 * and/or nonRepudiation (other values are not consistent and shall
866 if ((x
->ex_flags
& EXFLAG_KUSAGE
)
867 && ((x
->ex_kusage
& ~(KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
)) ||
868 !(x
->ex_kusage
& (KU_NON_REPUDIATION
| KU_DIGITAL_SIGNATURE
))))
871 /* Only time stamp key usage is permitted and it's required. */
872 if (!(x
->ex_flags
& EXFLAG_XKUSAGE
) || x
->ex_xkusage
!= XKU_TIMESTAMP
)
875 /* Extended Key Usage MUST be critical */
876 i_ext
= X509_get_ext_by_NID(x
, NID_ext_key_usage
, -1);
878 X509_EXTENSION
*ext
= X509_get_ext((X509
*)x
, i_ext
);
879 if (!X509_EXTENSION_get_critical(ext
))
886 static int no_check_purpose(const X509_PURPOSE
*xp
, const X509
*x
,
893 * Various checks to see if one certificate potentially issued the second.
894 * This can be used to prune a set of possible issuer certificates which
895 * have been looked up using some simple method such as by subject name.
897 * 1. issuer_name(subject) == subject_name(issuer)
898 * 2. If akid(subject) exists, it matches the respective issuer fields.
899 * 3. subject signature algorithm == issuer public key algorithm
900 * 4. If key_usage(issuer) exists, it allows for signing subject.
901 * Note that this does not include actually checking the signature.
902 * Returns 0 for OK, or positive for reason for mismatch
903 * where reason codes match those for X509_verify_cert().
905 int X509_check_issued(X509
*issuer
, X509
*subject
)
909 if ((ret
= ossl_x509_likely_issued(issuer
, subject
)) != X509_V_OK
)
911 return ossl_x509_signing_allowed(issuer
, subject
);
914 /* do the checks 1., 2., and 3. as described above for X509_check_issued() */
915 int ossl_x509_likely_issued(X509
*issuer
, X509
*subject
)
919 if (X509_NAME_cmp(X509_get_subject_name(issuer
),
920 X509_get_issuer_name(subject
)) != 0)
921 return X509_V_ERR_SUBJECT_ISSUER_MISMATCH
;
923 /* set issuer->skid and subject->akid */
924 if (!ossl_x509v3_cache_extensions(issuer
)
925 || !ossl_x509v3_cache_extensions(subject
))
926 return X509_V_ERR_UNSPECIFIED
;
928 ret
= X509_check_akid(issuer
, subject
->akid
);
929 if (ret
!= X509_V_OK
)
932 /* Check if the subject signature alg matches the issuer's PUBKEY alg */
933 return check_sig_alg_match(X509_get0_pubkey(issuer
), subject
);
937 * Check if certificate I<issuer> is allowed to issue certificate I<subject>
938 * according to the B<keyUsage> field of I<issuer> if present
939 * depending on any proxyCertInfo extension of I<subject>.
940 * Returns 0 for OK, or positive for reason for rejection
941 * where reason codes match those for X509_verify_cert().
943 int ossl_x509_signing_allowed(const X509
*issuer
, const X509
*subject
)
945 if (subject
->ex_flags
& EXFLAG_PROXY
) {
946 if (ku_reject(issuer
, KU_DIGITAL_SIGNATURE
))
947 return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE
;
948 } else if (ku_reject(issuer
, KU_KEY_CERT_SIGN
))
949 return X509_V_ERR_KEYUSAGE_NO_CERTSIGN
;
953 int X509_check_akid(const X509
*issuer
, const AUTHORITY_KEYID
*akid
)
958 /* Check key ids (if present) */
959 if (akid
->keyid
&& issuer
->skid
&&
960 ASN1_OCTET_STRING_cmp(akid
->keyid
, issuer
->skid
))
961 return X509_V_ERR_AKID_SKID_MISMATCH
;
962 /* Check serial number */
964 ASN1_INTEGER_cmp(X509_get0_serialNumber(issuer
), akid
->serial
))
965 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
966 /* Check issuer name */
969 * Ugh, for some peculiar reason AKID includes SEQUENCE OF
970 * GeneralName. So look for a DirName. There may be more than one but
971 * we only take any notice of the first.
975 X509_NAME
*nm
= NULL
;
978 for (i
= 0; i
< sk_GENERAL_NAME_num(gens
); i
++) {
979 gen
= sk_GENERAL_NAME_value(gens
, i
);
980 if (gen
->type
== GEN_DIRNAME
) {
985 if (nm
!= NULL
&& X509_NAME_cmp(nm
, X509_get_issuer_name(issuer
)) != 0)
986 return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH
;
991 uint32_t X509_get_extension_flags(X509
*x
)
993 /* Call for side-effect of computing hash and caching extensions */
994 X509_check_purpose(x
, -1, 0);
998 uint32_t X509_get_key_usage(X509
*x
)
1000 /* Call for side-effect of computing hash and caching extensions */
1001 if (X509_check_purpose(x
, -1, 0) != 1)
1003 if (x
->ex_flags
& EXFLAG_KUSAGE
)
1004 return x
->ex_kusage
;
1008 uint32_t X509_get_extended_key_usage(X509
*x
)
1010 /* Call for side-effect of computing hash and caching extensions */
1011 if (X509_check_purpose(x
, -1, 0) != 1)
1013 if (x
->ex_flags
& EXFLAG_XKUSAGE
)
1014 return x
->ex_xkusage
;
1018 const ASN1_OCTET_STRING
*X509_get0_subject_key_id(X509
*x
)
1020 /* Call for side-effect of computing hash and caching extensions */
1021 if (X509_check_purpose(x
, -1, 0) != 1)
1026 const ASN1_OCTET_STRING
*X509_get0_authority_key_id(X509
*x
)
1028 /* Call for side-effect of computing hash and caching extensions */
1029 if (X509_check_purpose(x
, -1, 0) != 1)
1031 return (x
->akid
!= NULL
? x
->akid
->keyid
: NULL
);
1034 const GENERAL_NAMES
*X509_get0_authority_issuer(X509
*x
)
1036 /* Call for side-effect of computing hash and caching extensions */
1037 if (X509_check_purpose(x
, -1, 0) != 1)
1039 return (x
->akid
!= NULL
? x
->akid
->issuer
: NULL
);
1042 const ASN1_INTEGER
*X509_get0_authority_serial(X509
*x
)
1044 /* Call for side-effect of computing hash and caching extensions */
1045 if (X509_check_purpose(x
, -1, 0) != 1)
1047 return (x
->akid
!= NULL
? x
->akid
->serial
: NULL
);
1050 long X509_get_pathlen(X509
*x
)
1052 /* Called for side effect of caching extensions */
1053 if (X509_check_purpose(x
, -1, 0) != 1
1054 || (x
->ex_flags
& EXFLAG_BCONS
) == 0)
1056 return x
->ex_pathlen
;
1059 long X509_get_proxy_pathlen(X509
*x
)
1061 /* Called for side effect of caching extensions */
1062 if (X509_check_purpose(x
, -1, 0) != 1
1063 || (x
->ex_flags
& EXFLAG_PROXY
) == 0)
1065 return x
->ex_pcpathlen
;