/* v3_purp.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
- * project 1999.
+ * project 2001.
*/
/* ====================================================================
- * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
+ * Copyright (c) 1999-2004 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
static void x509v3_cache_extensions(X509 *x);
-static int ca_check(const X509 *x);
static int check_ssl_ca(const X509 *x);
static int check_purpose_ssl_client(const X509_PURPOSE *xp, const X509 *x, int ca);
static int check_purpose_ssl_server(const X509_PURPOSE *xp, const X509 *x, int ca);
return pt->check_purpose(pt, x, ca);
}
+int X509_PURPOSE_set(int *p, int purpose)
+{
+ if(X509_PURPOSE_get_by_id(purpose) == -1) {
+ X509V3err(X509V3_F_X509_PURPOSE_SET, X509V3_R_INVALID_PURPOSE);
+ return 0;
+ }
+ *p = purpose;
+ return 1;
+}
+
int X509_PURPOSE_get_count(void)
{
if(!xptable) return X509_PURPOSE_COUNT;
X509_PURPOSE * X509_PURPOSE_get0(int idx)
{
if(idx < 0) return NULL;
- if(idx < X509_PURPOSE_COUNT) return xstandard + idx;
+ if(idx < (int)X509_PURPOSE_COUNT) return xstandard + idx;
return sk_X509_PURPOSE_value(xptable, idx - X509_PURPOSE_COUNT);
}
void X509_PURPOSE_cleanup(void)
{
- int i;
+ unsigned int i;
sk_X509_PURPOSE_pop_free(xptable, xptable_free);
for(i = 0; i < X509_PURPOSE_COUNT; i++) xptable_free(xstandard + i);
xptable = NULL;
return xp->trust;
}
+static int nid_cmp(int *a, int *b)
+ {
+ return *a - *b;
+ }
+
+int X509_supported_extension(X509_EXTENSION *ex)
+ {
+ /* This table is a list of the NIDs of supported extensions:
+ * that is those which are used by the verify process. If
+ * an extension is critical and doesn't appear in this list
+ * then the verify process will normally reject the certificate.
+ * The list must be kept in numerical order because it will be
+ * searched using bsearch.
+ */
+
+ static int supported_nids[] = {
+ NID_netscape_cert_type, /* 71 */
+ NID_key_usage, /* 83 */
+ NID_subject_alt_name, /* 85 */
+ NID_basic_constraints, /* 87 */
+ NID_ext_key_usage, /* 126 */
+ NID_proxyCertInfo /* 661 */
+ };
+
+ int ex_nid;
+
+ ex_nid = OBJ_obj2nid(X509_EXTENSION_get_object(ex));
+
+ if (ex_nid == NID_undef)
+ return 0;
+
+ if (OBJ_bsearch((char *)&ex_nid, (char *)supported_nids,
+ sizeof(supported_nids)/sizeof(int), sizeof(int),
+ (int (*)(const void *, const void *))nid_cmp))
+ return 1;
+ return 0;
+ }
+
+
static void x509v3_cache_extensions(X509 *x)
{
BASIC_CONSTRAINTS *bs;
+ PROXY_CERT_INFO_EXTENSION *pci;
ASN1_BIT_STRING *usage;
ASN1_BIT_STRING *ns;
EXTENDED_KEY_USAGE *extusage;
+ X509_EXTENSION *ex;
int i;
if(x->ex_flags & EXFLAG_SET) return;
-#ifndef NO_SHA
+#ifndef OPENSSL_NO_SHA
X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
#endif
/* Does subject name match issuer ? */
BASIC_CONSTRAINTS_free(bs);
x->ex_flags |= EXFLAG_BCONS;
}
+ /* Handle proxy certificates */
+ if((pci=X509_get_ext_d2i(x, NID_proxyCertInfo, NULL, NULL))) {
+ if (x->ex_flags & EXFLAG_CA
+ || X509_get_ext_by_NID(x, NID_subject_alt_name, 0) >= 0
+ || X509_get_ext_by_NID(x, NID_issuer_alt_name, 0) >= 0) {
+ x->ex_flags |= EXFLAG_INVALID;
+ }
+ if (pci->pcPathLengthConstraint) {
+ x->ex_pcpathlen =
+ ASN1_INTEGER_get(pci->pcPathLengthConstraint);
+ } else x->ex_pcpathlen = -1;
+ PROXY_CERT_INFO_EXTENSION_free(pci);
+ x->ex_flags |= EXFLAG_PROXY;
+ }
/* Handle key usage */
if((usage=X509_get_ext_d2i(x, NID_key_usage, NULL, NULL))) {
if(usage->length > 0) {
case NID_time_stamp:
x->ex_xkusage |= XKU_TIMESTAMP;
break;
+
+ case NID_dvcs:
+ x->ex_xkusage |= XKU_DVCS;
+ break;
}
}
sk_ASN1_OBJECT_pop_free(extusage, ASN1_OBJECT_free);
}
x->skid =X509_get_ext_d2i(x, NID_subject_key_identifier, NULL, NULL);
x->akid =X509_get_ext_d2i(x, NID_authority_key_identifier, NULL, NULL);
+ for (i = 0; i < X509_get_ext_count(x); i++)
+ {
+ ex = X509_get_ext(x, i);
+ if (!X509_EXTENSION_get_critical(ex))
+ continue;
+ if (!X509_supported_extension(ex))
+ {
+ x->ex_flags |= EXFLAG_CRITICAL;
+ break;
+ }
+ }
x->ex_flags |= EXFLAG_SET;
}
* 1 is a CA
* 2 basicConstraints absent so "maybe" a CA
* 3 basicConstraints absent but self signed V1.
+ * 4 basicConstraints absent but keyUsage present and keyCertSign asserted.
*/
#define V1_ROOT (EXFLAG_V1|EXFLAG_SS)
#define ns_reject(x, usage) \
(((x)->ex_flags & EXFLAG_NSCERT) && !((x)->ex_nscert & (usage)))
-static int ca_check(const X509 *x)
+static int check_ca(const X509 *x)
{
/* keyUsage if present should allow cert signing */
if(ku_reject(x, KU_KEY_CERT_SIGN)) return 0;
/* If basicConstraints says not a CA then say so */
else return 0;
} else {
+ /* we support V1 roots for... uh, I don't really know why. */
if((x->ex_flags & V1_ROOT) == V1_ROOT) return 3;
/* If key usage present it must have certSign so tolerate it */
- else if (x->ex_flags & EXFLAG_KUSAGE) return 3;
- else return 2;
+ else if (x->ex_flags & EXFLAG_KUSAGE) return 4;
+ /* Older certificates could have Netscape-specific CA types */
+ else if (x->ex_flags & EXFLAG_NSCERT
+ && x->ex_nscert & NS_ANY_CA) return 5;
+ /* can this still be regarded a CA certificate? I doubt it */
+ return 0;
}
}
+int X509_check_ca(X509 *x)
+{
+ if(!(x->ex_flags & EXFLAG_SET)) {
+ CRYPTO_w_lock(CRYPTO_LOCK_X509);
+ x509v3_cache_extensions(x);
+ CRYPTO_w_unlock(CRYPTO_LOCK_X509);
+ }
+
+ return check_ca(x);
+}
+
/* Check SSL CA: common checks for SSL client and server */
static int check_ssl_ca(const X509 *x)
{
int ca_ret;
- ca_ret = ca_check(x);
+ ca_ret = check_ca(x);
if(!ca_ret) return 0;
/* check nsCertType if present */
- if(x->ex_flags & EXFLAG_NSCERT) {
- if(x->ex_nscert & NS_SSL_CA) return ca_ret;
- return 0;
- }
- if(ca_ret != 2) return ca_ret;
+ if(ca_ret != 5 || x->ex_nscert & NS_SSL_CA) return ca_ret;
else return 0;
}
if(xku_reject(x,XKU_SMIME)) return 0;
if(ca) {
int ca_ret;
- ca_ret = ca_check(x);
+ ca_ret = check_ca(x);
if(!ca_ret) return 0;
/* check nsCertType if present */
- if(x->ex_flags & EXFLAG_NSCERT) {
- if(x->ex_nscert & NS_SMIME_CA) return ca_ret;
- return 0;
- }
- if(ca_ret != 2) return ca_ret;
+ if(ca_ret != 5 || x->ex_nscert & NS_SMIME_CA) return ca_ret;
else return 0;
}
if(x->ex_flags & EXFLAG_NSCERT) {
{
if(ca) {
int ca_ret;
- if((ca_ret = ca_check(x)) != 2) return ca_ret;
+ if((ca_ret = check_ca(x)) != 2) return ca_ret;
else return 0;
}
if(ku_reject(x, KU_CRL_SIGN)) return 0;
static int ocsp_helper(const X509_PURPOSE *xp, const X509 *x, int ca)
{
- /* Must be a valid CA */
- if(ca) {
- int ca_ret;
- ca_ret = ca_check(x);
- if(ca_ret != 2) return ca_ret;
- if(x->ex_flags & EXFLAG_NSCERT) {
- if(x->ex_nscert & NS_ANY_CA) return ca_ret;
- return 0;
- }
- return 0;
- }
+ /* Must be a valid CA. Should we really support the "I don't know"
+ value (2)? */
+ if(ca) return check_ca(x);
/* leaf certificate is checked in OCSP_verify() */
return 1;
}
return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
}
}
- if(ku_reject(issuer, KU_KEY_CERT_SIGN)) return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
+ if(subject->ex_flags & EXFLAG_PROXY)
+ {
+ if(ku_reject(issuer, KU_DIGITAL_SIGNATURE))
+ return X509_V_ERR_KEYUSAGE_NO_DIGITAL_SIGNATURE;
+ }
+ else if(ku_reject(issuer, KU_KEY_CERT_SIGN))
+ return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
return X509_V_OK;
}