Listing Windows users and groups in C#

gistfile1.cs

using System;
using System.Management;
using System.Collections;

class Tester
{
    [Flags]
	enum Mask : uint
	{
		FILE_READ_DATA = 0x00000001,
		FILE_WRITE_DATA = 0x00000002,
		FILE_APPEND_DATA = 0x00000004,
		FILE_READ_EA = 0x00000008,
		FILE_WRITE_EA = 0x00000010,
		FILE_EXECUTE = 0x00000020,
		FILE_DELETE_CHILD = 0x00000040,
		FILE_READ_ATTRIBUTES = 0x00000080,
		FILE_WRITE_ATTRIBUTES = 0x00000100,
		DELETE = 0x00010000,
		READ_CONTROL = 0x00020000,
		WRITE_DAC = 0x00040000,
		WRITE_OWNER = 0x00080000,
		SYNCHRONIZE = 0x00100000,
		ACCESS_SYSTEM_SECURITY = 0x01000000,
		MAXIMUM_ALLOWED = 0x02000000,
		GENERIC_ALL = 0x10000000,
		GENERIC_EXECUTE = 0x20000000,
		GENERIC_WRITE = 0x40000000,
		GENERIC_READ = 0x80000000
	}

	public static void Main()
	{
		try
		{
			ManagementObject lfs = new ManagementObject(@"Win32_LogicalFileSecuritySetting.Path='c:\\windows'");

			// Dump all trustees (this includes owner)
			foreach (ManagementBaseObject b in lfs.GetRelated())
				Console.WriteLine("Trustees {0} is {1}", b["AccountName"], b["SID"]);

			// Get the security descriptor for this object
			ManagementBaseObject outP = lfs.InvokeMethod("GetSecurityDescriptor", null, null);
			if (((uint)(outP.Properties["ReturnValue"].Value)) == 0)
			{
				ManagementBaseObject Descriptor = ((ManagementBaseObject)(outP.Properties["Descriptor"].Value));
				DumpDescriptor(Descriptor);
				ManagementBaseObject[] DaclObject = ((ManagementBaseObject[])(Descriptor.Properties["Dacl"].Value));
				DumpACEs(DaclObject);
				ManagementBaseObject OwnerObject = ((ManagementBaseObject)(Descriptor.Properties["Owner"].Value));
				DumpOwnerProperties(OwnerObject.Properties); // Show owner properies
				ManagementBaseObject GroupObject = ((ManagementBaseObject)(Descriptor.Properties["Group"].Value));
				DumpGroup(GroupObject);
				ManagementBaseObject[] SaclObject = ((ManagementBaseObject[])(Descriptor.Properties["SACL"].Value));
				DumpSacl(SaclObject);
			}
		}
		catch (Exception e)
		{
			Console.WriteLine(e);
		}
		Console.ReadLine();
	}

	static void DumpDescriptor(ManagementBaseObject Descriptor)
	{
		/* Win32_SecurityDescriptor
		ControlFlags
		DACL
		Group
		Owner
		SACL
		*/
		Console.WriteLine(Descriptor.ClassPath);
		foreach (PropertyData pd in Descriptor.Properties)
			Console.WriteLine(pd.Name);
	}

	static void DumpACEs(ManagementBaseObject[] DaclObject)
	{
		// ACE masks see: winnt.h
		string[] filedesc = 
		{
			"FILE_READ_DATA", "FILE_WRITE_DATA", "FILE_APPEND_DATA",  "FILE_READ_EA",
			"FILE_WRITE_EA", "FILE_EXECUTE", "FILE_DELETE_CHILD", "FILE_READ_ATTRIBUTES",
			"FILE_WRITE_ATTRIBUTES", " ", " ", " ",
			" ", " ", " ", " ",
			"DELETE ", "READ_CONTROL", "WRITE_DAC", "WRITE_OWNER",
			"SYNCHRONIZE ", " ", " "," ",
			"ACCESS_SYSTEM_SECURITY", "MAXIMUM_ALLOWED", " "," ",
			"GENERIC_ALL", "GENERIC_EXECUTE", "GENERIC_WRITE","GENERIC_READ"
		};

		foreach (ManagementBaseObject mbo in DaclObject)
		{
			Console.WriteLine("-------------------------------------------------");
			Console.WriteLine("{0:X} - {1} - {2}", mbo["AccessMask"], mbo["AceFlags"], mbo["AceType"]);

			// Access allowed/denied ACE
			if (mbo["AceType"].ToString() == "1")
				Console.WriteLine("DENIED ACE TYPE");
			else
				Console.WriteLine("ALLOWED ACE TYPE");

			// Dump trustees
			ManagementBaseObject Trustee = ((ManagementBaseObject)(mbo["Trustee"]));
			Console.WriteLine("Name: {0} - Domain: {1} - SID {2}\n",
			Trustee.Properties["Name"].Value,
			Trustee.Properties["Domain"].Value,
			Trustee.Properties["SIDString"].Value);

			// Dump ACE mask in readable form
			UInt32 mask = (UInt32)mbo["AccessMask"];

			// using enum formatting (see emumerating the possibilities.doc)
			Console.WriteLine(System.Enum.Format(typeof(Mask), mask, "g"));
		}
	}

	static void DumpGroup(ManagementBaseObject Groups)
	{
		if (Groups != null)
		{
			Console.WriteLine("=======================================");
			Console.WriteLine("Group property count : " + Groups.Properties.Count);
			foreach (PropertyData gd in Groups.Properties)
				Console.WriteLine(gd.Name + "\t\t " + gd.Value);
		}
		else
			Console.WriteLine("NO GROUPS Properties ");
	}

	static void DumpSacl(ManagementBaseObject[] SaclObject)
	{
		if (SaclObject == null)
			Console.WriteLine("No SACLs");
	}

	static void DumpOwnerProperties(PropertyDataCollection Owner)
	{
		Console.WriteLine("=============== Owner Properties ========================");
		Console.WriteLine();
		Console.WriteLine("Domain {0} \tName {1}", Owner["Domain"].Value, Owner["Name"].Value);
		Console.WriteLine("SID \t{0}", Owner["SidString"].Value);
	}
}