/*
 * Process Hacker - 
 *   local security policy handle
 * 
 * Copyright (C) 2008-2009 wj32
 * 
 * This file is part of Process Hacker.
 * 
 * Process Hacker is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Process Hacker 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Process Hacker.  If not, see <http://www.gnu.org/licenses/>.
 */

using ProcessHacker.Native.Api;
using ProcessHacker.Native.Security;
using System;

namespace ProcessHacker.Native.Objects
{
    /// <summary>
    /// Represents a handle to the Windows service manager.
    /// </summary>
    public class LsaPolicyHandle : LsaHandle<PolicyAccess>
    {
        /// <summary>
        /// Connects to the local LSA policy.
        /// </summary>
        /// <param name="access">The desired access to the policy.</param>
        public LsaPolicyHandle(PolicyAccess access)
        {
            NtStatus status;
            ObjectAttributes attributes = new ObjectAttributes();
            IntPtr handle = IntPtr.Zero;

            if ((status = Win32.LsaOpenPolicy(IntPtr.Zero, ref attributes, access, ref handle)) >= NtStatus.Error)
                Win32.ThrowLastError(status);

            this.Handle = handle;
        }

        public Sid[] GetAccounts()
        {
            NtStatus status;
            IntPtr data;
            int length;

            if ((status = Win32.LsaEnumerateAccountsWithUserRight(
                this, IntPtr.Zero, out data, out length)) != NtStatus.Success)
                Win32.ThrowLastError(status);

            Sid[] sids = new Sid[length];

            using (var memory = new LsaMemoryAlloc(data))
            {
                for (int i = 0; i < length; i++)
                {
                    sids[i] = new Sid(memory.ReadIntPtr(0, i));
                }
            }

            return sids;
        }
    }
}