Add prefix matching test for OIDs.

[gssweb.git] / json_gssapi / src / datamodel / GSSOID.cpp

diff --git a/json_gssapi/src/datamodel/GSSOID.cpp b/json_gssapi/src/datamodel/GSSOID.cpp
index 7e53fd2..ff4f3e3 100644 (file)
--- a/json_gssapi/src/datamodel/GSSOID.cpp
+++ b/json_gssapi/src/datamodel/GSSOID.cpp
@@ -1,10 +1,39 @@
 /*
- * Copyright (c) 2014 <copyright holder> <email>
- * 
- * For license details, see the LICENSE file in the root of this project.
- * 
+ * Copyright (c) 2014, 2015 JANET(UK)
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of JANET(UK) nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
  */
 
+#include <string.h>
+
 #include "GSSOID.h"
 #include "../GSSException.h"
 
@@ -124,3 +153,43 @@ bool GSSOID::setValue ( gss_OID gssOID )
   this->gssInternal = true;
   return true;
 }
+
+bool GSSOID::matchesBaseOID ( const gss_OID_desc &base_oid )
+{
+  /* Variables */
+  unsigned char *elements = reinterpret_cast <unsigned char*>(oid->elements);
+  
+  /* Error checking */
+  /* Setup */
+  /* Main processing */
+  // We can't match the prefex if we're not longer than the prefix.
+  if (oid->length <= base_oid.length)
+    return(false);
+
+  // Match the prefix itself.
+  if (memcmp(oid->elements, base_oid.elements, base_oid.length) != 0)
+    return(false);
+
+  // Constrain the suffix to a single OID segment.
+  // The break between segments is signified whenever an octet has 0 in
+  // its high-order bit.  Check that no octet between the prefix and the
+  // last octet has 0 in its high-order bit
+  for (size_t i = base_oid.length;
+       oid->length - 1 > i;
+       i++)
+  {
+    if( !(elements[i] & 0x80) )
+      return(false);
+  }
+
+  // Add a sanity check that the last octet has 0 in its high-order bit.
+  if( elements[oid->length - 1] & 0x80 )
+    return(false);
+  
+  /* Cleanup */
+  // No memory allocated, just typecast - nothing to clean up
+  
+  /* Return */
+  return(true);
+}
+