/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.fs.ntfs.security;
import java.util.ArrayList;
import java.util.List;
import org.jnode.fs.ntfs.NTFSStructure;
import org.jnode.util.BigEndian;
/**
* Security related utilities.
*
* @author Luke Quinane
*/
public class SecurityUtils {
private SecurityUtils() {
// Prevent instantiation
}
/**
* Reads in a SID.
*
* @param structure the structure to read from.
* @param offset the offset to the SID.
* @return the SID.
*/
public static SecurityIdentifier readSid(NTFSStructure structure, int offset) {
// Sanity check
int sidVersion = structure.getInt8(offset);
if (sidVersion != 1) {
throw new IllegalStateException("Invalid SID version: " + sidVersion);
}
// Read in the SID
int subAuthorityCount = structure.getInt8(offset + 1);
byte[] authorityBuffer = new byte[6];
structure.getData(offset + 2, authorityBuffer, 0, authorityBuffer.length);
long authority = BigEndian.getUInt48(authorityBuffer, 0); // Why is this big endian??
List<Long> subAuthorities = new ArrayList<Long>();
for (int i = 0; i < subAuthorityCount; i++) {
subAuthorities.add(structure.getUInt32(offset + 8 + (4 * i)));
}
return new SecurityIdentifier(authority, subAuthorities);
}
}