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POSetting size of TOKEN_PRIVILEGES.LUID_AND_ATTRIBUTES array returned by GetTokenInformation
 

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    <p>I'm trying to retrieve the privileges and their current state associated with a token in C# but i can't figure out how to adjust the size of the <code>LUID_AND_ATTRIBUTES</code> array that is returned to fit the actual number of elements.</p> <p>From <a href="http://msdn.microsoft.com/en-us/library/system.runtime.interopservices.unmanagedtype%28v=VS.71%29.aspx" rel="nofollow">MSDN</a></p> <blockquote> <p>When MarshalAsAttribute.Value is set to ByValArray, the SizeConst must be set to indicate the number of elements in the array.</p> </blockquote> <p>I was able to watch the <code>TOKEN_PRIVILEGES.PrivilegeCount</code> property after the call to <code>GetTokenInformation</code> and see that the token I was working with had 24 of the 35 privileges listed on the <a href="http://msdn.microsoft.com/en-us/library/bb530716%28v=VS.85%29.aspx" rel="nofollow">Privilege Constants</a> reference page. Changing <code>SizeConst = 24</code> would then give me the ability to see all of them instead of just the first one (I had initially set <code>SizeConst = 1</code> following a usage example from <a href="http://www.pinvoke.net/default.aspx/Structures/TOKEN_PRIVILEGES.html" rel="nofollow">PInvoke</a>)</p> <p>Is there a way to specify the depth of the incoming array as it is being created or will I need to know how many privileges there are going to be before writing the code?</p> <h2>Code Snippet</h2> <pre><code>[DllImport("advapi32.dll", SetLastError = true)] protected static extern bool GetTokenInformation(IntPtr TokenHandle, TOKEN_INFORMATION_CLASS TokenInformationClass, IntPtr TokenInformation, int TokenInformationLength, ref int ReturnLength); [DllImport("advapi32.dll", SetLastError = true, CharSet = CharSet.Auto)][return: MarshalAs(UnmanagedType.Bool)] protected static extern bool LookupPrivilegeName(string lpSystemName, IntPtr lpLuid,System.Text.StringBuilder lpName, ref int cchName); protected struct TOKEN_PRIVILEGES { public UInt32 PrivilegeCount; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 1)] public LUID_AND_ATTRIBUTES[] Privileges; }//TOKEN_PRIVILEGES [StructLayout(LayoutKind.Sequential)] protected struct LUID_AND_ATTRIBUTES { public LUID Luid; public UInt32 Attributes; }//LUID_AND_ATTRIBUTES [StructLayout(LayoutKind.Sequential)] protected struct LUID { public uint LowPart; public int HighPart; }//LUID int TokenInfLength = 0; IntPtr ThisHandle = WindowsIdentity.GetCurrent().Token; GetTokenInformation(ThisHandle, TOKEN_INFORMATION_CLASS.TokenPrivileges, IntPtr.Zero, TokenInfLength, ref TokenInfLength); //Get the TokenInformation length (returns false) IntPtr TokenInformation = Marshal.AllocHGlobal(TokenInfLength); if(GetTokenInformation(WindowsIdentity.GetCurrent().Token, TOKEN_INFORMATION_CLASS.TokenPrivileges, TokenInformation, TokenInfLength, ref TokenInfLength)){ TOKEN_PRIVILEGES ThisPrivilegeSet = (TOKEN_PRIVILEGES)Marshal.PtrToStructure(TokenInformation, typeof(TOKEN_PRIVILEGES)); //ThisPrivilegeSet now holds all of the LUID's i need to check out foreach(LUID_AND_ATTRIBUTES laa in ThisPrivilegeSet.Privileges){ //ThisPrivilegeSet.Privileges is only as deep as SizeConst will allow System.Text.StringBuilder StrBuilder = new System.Text.StringBuilder(); int LuidNameLen = 0; IntPtr LuidPointer = Marshal.AllocHGlobal(Marshal.SizeOf(laa.Luid)); Marshal.StructureToPtr(laa.Luid, LuidPointer, true); LookupPrivilegeName(null, LuidPointer, null, ref LuidNameLen); //Get the PrivilageName length (returns false) StrBuilder.EnsureCapacity(LuidNameLen + 1); if(LookupPrivilegeName(null, LuidPointer, StrBuilder, ref LuidNameLen)){ //StrBuilder gets the name this time Console.WriteLine("[{0}] : {1}", laa.Attributes.ToString(), StrBuilder.ToString()); }//end if Marshal.FreeHGlobal(LuidPointer); }//next }//end if </code></pre> <p>This is my first post, so sorry if I did it wrong and TIA for the help</p>
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    2. COThank you for that, I was able to modify the example provided in the blog post to work in this situation and I learned a good deal about how pointers work.
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