New functions to check a hostname email or IP address against a
[openssl.git] / crypto / x509v3 / v3_utl.c
index e030234..db9f05e 100644 (file)
@@ -568,6 +568,134 @@ void X509_email_free(STACK_OF(OPENSSL_STRING) *sk)
        sk_OPENSSL_STRING_pop_free(sk, str_free);
 }
 
+/* Compare an ASN1_STRING to a supplied string. If they match
+ * return 1. If cmp_type > 0 only compare if string matches the
+ * type, otherwise convert it to UTF8.
+ */
+
+static int do_check_string(ASN1_STRING *a, int cmp_type,
+                               const unsigned char *b, size_t blen)
+       {
+       if (!a->data || !a->length)
+               return 0;
+       if (cmp_type > 0)
+               {
+               if (cmp_type != a->type)
+                       return 0;
+               if (a->length == (int)blen && !memcmp(a->data, b, blen))
+                       return 1;
+               else
+                       return 0;
+               }
+       else
+               {
+               int astrlen, rv;
+               unsigned char *astr;
+               astrlen = ASN1_STRING_to_UTF8(&astr, a);
+               if (astrlen < 0)
+                       return 0;
+               if (astrlen == (int)blen && !memcmp(astr, b, blen))
+                       rv = 1;
+               else
+                       rv = 0;
+               OPENSSL_free(astr);
+               return rv;
+               }
+       }
+
+static int do_x509_check(X509 *x, const unsigned char *chk, size_t chklen,
+                                       unsigned int flags, int check_type)
+       {
+       GENERAL_NAMES *gens = NULL;
+       X509_NAME *name = NULL;
+       int i;
+       int cnid;
+       if (check_type == GEN_EMAIL)
+               cnid = NID_pkcs9_emailAddress;
+       else if (check_type == GEN_DNS)
+               cnid = NID_commonName;
+       else
+               cnid = 0;
+
+       if (chklen == 0)
+               chklen = strlen((const char *)chk);
+
+       gens = X509_get_ext_d2i(x, NID_subject_alt_name, NULL, NULL);
+       if (gens)
+               {
+               int rv = 0;
+               int alt_type;
+               if (cnid)
+                       alt_type = V_ASN1_IA5STRING;
+               else
+                       alt_type = V_ASN1_OCTET_STRING;
+               for (i = 0; i < sk_GENERAL_NAME_num(gens); i++)
+                       {
+                       GENERAL_NAME *gen;
+                       ASN1_STRING *cstr;
+                       gen = sk_GENERAL_NAME_value(gens, i);
+                       if(gen->type != check_type)
+                               continue;
+                       if (check_type == GEN_EMAIL)
+                               cstr = gen->d.rfc822Name;
+                       else if (check_type == GEN_DNS)
+                               cstr = gen->d.dNSName;
+                       else
+                               cstr = gen->d.iPAddress;
+                       if (do_check_string(cstr, alt_type, chk, chklen))
+                               {
+                               rv = 1;
+                               break;
+                               }
+                       }
+               GENERAL_NAMES_free(gens);
+               if (rv)
+                       return 1;
+               if (!(flags & X509_CHECK_FLAG_ALWAYS_CHECK_SUBJECT) || !cnid)
+                       return 0;
+               }
+       i = -1;
+       name = X509_get_subject_name(x);
+       while((i = X509_NAME_get_index_by_NID(name, cnid, i)) >= 0)
+               {
+               X509_NAME_ENTRY *ne;
+               ASN1_STRING *str;
+               ne = X509_NAME_get_entry(name, i);
+               str = X509_NAME_ENTRY_get_data(ne);
+               if (do_check_string(str, -1, chk, chklen))
+                       return 1;
+               }
+       return 0;
+       }
+
+int X509_check_host(X509 *x, const unsigned char *chk, size_t chklen,
+                                       unsigned int flags)
+       {
+       return do_x509_check(x, chk, chklen, flags, GEN_DNS);
+       }
+
+int X509_check_email(X509 *x, const unsigned char *chk, size_t chklen,
+                                       unsigned int flags)
+       {
+       return do_x509_check(x, chk, chklen, flags, GEN_EMAIL);
+       }
+
+int X509_check_ip(X509 *x, const unsigned char *chk, size_t chklen,
+                                       unsigned int flags)
+       {
+       return do_x509_check(x, chk, chklen, flags, GEN_IPADD);
+       }
+
+int X509_check_ip_asc(X509 *x, const char *ipasc, unsigned int flags)
+       {
+       unsigned char ipout[16];
+       int iplen;
+       iplen = a2i_ipadd(ipout, ipasc);
+       if (iplen == 0)
+               return 0;
+       return do_x509_check(x, ipout, (size_t)iplen, flags, GEN_IPADD);
+       }
+
 /* Convert IP addresses both IPv4 and IPv6 into an 
  * OCTET STRING compatible with RFC3280.
  */