#include <stdio.h>
#include "cryptlib.h"
#include <openssl/x509v3.h>
+#include <openssl/x509_vfy.h>
static void x509v3_cache_extensions(X509 *x);
return xp->trust;
}
-#ifndef NO_SHA
static void x509v3_cache_extensions(X509 *x)
{
BASIC_CONSTRAINTS *bs;
ASN1_BIT_STRING *usage;
ASN1_BIT_STRING *ns;
- STACK_OF(ASN1_OBJECT) *extusage;
+ EXTENDED_KEY_USAGE *extusage;
+
int i;
if(x->ex_flags & EXFLAG_SET) return;
+#ifndef NO_SHA
X509_digest(x, EVP_sha1(), x->sha1_hash, NULL);
+#endif
/* Does subject name match issuer ? */
if(!X509_NAME_cmp(X509_get_subject_name(x), X509_get_issuer_name(x)))
x->ex_flags |= EXFLAG_SS;
x->ex_flags |= EXFLAG_NSCERT;
ASN1_BIT_STRING_free(ns);
}
+ 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);
x->ex_flags |= EXFLAG_SET;
}
-#endif
/* CA checks common to all purposes
* return codes:
{
return 1;
}
+
+/* Various checks to see if one certificate issued the second.
+ * This can be used to prune a set of possible issuer certificates
+ * which have been looked up using some simple method such as by
+ * subject name.
+ * These are:
+ * 1. Check issuer_name(subject) == subject_name(issuer)
+ * 2. If akid(subject) exists check it matches issuer
+ * 3. If key_usage(issuer) exists check it supports certificate signing
+ * returns 0 for OK, positive for reason for mismatch, reasons match
+ * codes for X509_verify_cert()
+ */
+
+int X509_check_issued(X509 *issuer, X509 *subject)
+{
+ if(X509_NAME_cmp(X509_get_subject_name(issuer),
+ X509_get_issuer_name(subject)))
+ return X509_V_ERR_SUBJECT_ISSUER_MISMATCH;
+ x509v3_cache_extensions(issuer);
+ x509v3_cache_extensions(subject);
+ if(subject->akid) {
+ /* Check key ids (if present) */
+ if(subject->akid->keyid && issuer->skid &&
+ ASN1_OCTET_STRING_cmp(subject->akid->keyid, issuer->skid) )
+ return X509_V_ERR_AKID_SKID_MISMATCH;
+ /* Check serial number */
+ if(subject->akid->serial &&
+ ASN1_INTEGER_cmp(X509_get_serialNumber(issuer),
+ subject->akid->serial))
+ return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
+ /* Check issuer name */
+ if(subject->akid->issuer) {
+ /* Ugh, for some peculiar reason AKID includes
+ * SEQUENCE OF GeneralName. So look for a DirName.
+ * There may be more than one but we only take any
+ * notice of the first.
+ */
+ GENERAL_NAMES *gens;
+ GENERAL_NAME *gen;
+ X509_NAME *nm = NULL;
+ int i;
+ gens = subject->akid->issuer;
+ for(i = 0; i < sk_GENERAL_NAME_num(gens); i++) {
+ gen = sk_GENERAL_NAME_value(gens, i);
+ if(gen->type == GEN_DIRNAME) {
+ nm = gen->d.dirn;
+ break;
+ }
+ }
+ if(nm && X509_NAME_cmp(nm, X509_get_issuer_name(issuer)))
+ return X509_V_ERR_AKID_ISSUER_SERIAL_MISMATCH;
+ }
+ }
+ if(ku_reject(issuer, KU_KEY_CERT_SIGN)) return X509_V_ERR_KEYUSAGE_NO_CERTSIGN;
+ return X509_V_OK;
+}
+