C# Signature:

    [DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true)]
    static extern uint LsaEnumerateAccountsWithUserRight(
    LSA_HANDLE PolicyHandle,
    LSA_UNICODE_STRING[] UserRights,
    out IntPtr EnumerationBuffer,
    out int CountReturned);

VB Signature:

    Declare Function LsaEnumerateAccountsWithUserRight Lib "advapi32.dll" ( _
    ByVal PolicyHandle As IntPtr, _
    ByRef userRights As LSA_UNICODE_STRING, _
    ByRef EnumerationBuffer As IntPtr, _
    ByRef CountReturned As Integer _
    ) As Integer

User-Defined Types:

None.

Alternative Managed API:

Do you know one? Please contribute it!

Notes:

    'NTSTATUS LsaEnumerateAccountsWithUserRight(
    '  LSA_HANDLE PolicyHandle,
    '  PLSA_UNICODE_STRING UserRights,
    '  PVOID* EnumerationBuffer,
    '  PULONG CountReturned
    ');

Tips & Tricks:

Please add some!

C#.Net Sample Code:

using System;
using System.Runtime.InteropServices;
using System.Security;
using System.ComponentModel;

namespace LsaSecurity

{

    using System;
    using System.Runtime.InteropServices;
    using System.Security;
    using System.ComponentModel;

namespace LsaSecurity
{
    using LSA_HANDLE = IntPtr;

    [StructLayout(LayoutKind.Sequential)]
    struct LSA_OBJECT_ATTRIBUTES
    {
    internal int Length;
    internal IntPtr RootDirectory;
    internal IntPtr ObjectName;
    internal int Attributes;
    internal IntPtr SecurityDescriptor;
    internal IntPtr SecurityQualityOfService;
    }

    [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
    struct LSA_UNICODE_STRING
    {
    internal ushort Length;
    internal ushort MaximumLength;
    [MarshalAs(UnmanagedType.LPWStr)]
    internal string Buffer;
    }

    [StructLayout(LayoutKind.Sequential)]
    struct LSA_ENUMERATION_INFORMATION
    {
    internal IntPtr PSid;
    }

    sealed class Win32Sec
    {
    [DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true),
    SuppressUnmanagedCodeSecurityAttribute]
    internal static extern uint LsaOpenPolicy(
    LSA_UNICODE_STRING[] SystemName,
    ref LSA_OBJECT_ATTRIBUTES ObjectAttributes,
    int AccessMask,
    out IntPtr PolicyHandle
    );

    [DllImport("advapi32", CharSet = CharSet.Unicode, SetLastError = true),
    SuppressUnmanagedCodeSecurityAttribute]
    internal static extern uint LsaEnumerateAccountsWithUserRight(
    LSA_HANDLE PolicyHandle,
    LSA_UNICODE_STRING[] UserRights,
    out IntPtr EnumerationBuffer,
    out int CountReturned
    );

    [DllImport("advapi32")]
    internal static extern int LsaNtStatusToWinError(int NTSTATUS);

    [DllImport("advapi32")]
    internal static extern int LsaClose(IntPtr PolicyHandle);

    [DllImport("advapi32")]
    internal static extern int LsaFreeMemory(IntPtr Buffer);

    }
    public class LsaWrapper : IDisposable
    {
    enum Access : int
    {
        POLICY_READ = 0x20006,
        POLICY_ALL_ACCESS = 0x00F0FFF,
        POLICY_EXECUTE = 0X20801,
        POLICY_WRITE = 0X207F8
    }
    const uint STATUS_ACCESS_DENIED = 0xc0000022;
    const uint STATUS_INSUFFICIENT_RESOURCES = 0xc000009a;
    const uint STATUS_NO_MEMORY = 0xc0000017;
    const uint STATUS_NO_MORE_ENTRIES = 0xc000001A;

    IntPtr lsaHandle;

    public LsaWrapper()
        : this(null)
    { }
    // local system if systemName is null
    public LsaWrapper(string systemName)
    {
        LSA_OBJECT_ATTRIBUTES lsaAttr;
        lsaAttr.RootDirectory = IntPtr.Zero;
        lsaAttr.ObjectName = IntPtr.Zero;
        lsaAttr.Attributes = 0;
        lsaAttr.SecurityDescriptor = IntPtr.Zero;
        lsaAttr.SecurityQualityOfService = IntPtr.Zero;
        lsaAttr.Length = Marshal.SizeOf(typeof(LSA_OBJECT_ATTRIBUTES));
        lsaHandle = IntPtr.Zero;
        LSA_UNICODE_STRING[] system = null;
        if (systemName != null)
        {
        system = new LSA_UNICODE_STRING[1];
        system[0] = InitLsaString(systemName);
        }

        uint ret = Win32Sec.LsaOpenPolicy(system, ref lsaAttr,
        (int)Access.POLICY_ALL_ACCESS, out lsaHandle);
        if (ret == 0)
        return;
        if (ret == STATUS_ACCESS_DENIED)
        {
        throw new UnauthorizedAccessException();
        }
        if ((ret == STATUS_INSUFFICIENT_RESOURCES) || (ret == STATUS_NO_MEMORY))
        {
        throw new OutOfMemoryException();
        }
        throw new Win32Exception(Win32Sec.LsaNtStatusToWinError((int)ret));
    }

    public void ReadPrivilege(string privilege)
    {
        LSA_UNICODE_STRING[] privileges = new LSA_UNICODE_STRING[1];
        privileges[0] = InitLsaString(privilege);
        IntPtr buffer;
        int count = 0;
        uint ret = Win32Sec.LsaEnumerateAccountsWithUserRight(lsaHandle, privileges, out buffer, out count);
        if (ret == 0)
        {

        LSA_ENUMERATION_INFORMATION[] LsaInfo = new LSA_ENUMERATION_INFORMATION[count];

        for (int i = 0, elemOffs = (int)buffer; i < count; i++)
        {
            LsaInfo[i] = (LSA_ENUMERATION_INFORMATION)Marshal.PtrToStructure(
                   (IntPtr)elemOffs, typeof(LSA_ENUMERATION_INFORMATION));

            elemOffs += Marshal.SizeOf(typeof(LSA_ENUMERATION_INFORMATION));
        }

        // Do something with LsaInfo here
        return;
        }
        if (ret == STATUS_ACCESS_DENIED)
        {
        throw new UnauthorizedAccessException();
        }
        if ((ret == STATUS_INSUFFICIENT_RESOURCES) || (ret == STATUS_NO_MEMORY))
        {
        throw new OutOfMemoryException();
        }
        throw new Win32Exception(Win32Sec.LsaNtStatusToWinError((int)ret));
    }

    public void Dispose()
    {
        if (lsaHandle != IntPtr.Zero)
        {
        Win32Sec.LsaClose(lsaHandle);
        lsaHandle = IntPtr.Zero;
        }
        GC.SuppressFinalize(this);
    }
    ~LsaWrapper()
    {
        Dispose();
    }

    static LSA_UNICODE_STRING InitLsaString(string s)
    {
        // Unicode strings max. 32KB
        if (s.Length > 0x7ffe)
        throw new ArgumentException("String too long");
        LSA_UNICODE_STRING lus = new LSA_UNICODE_STRING();
        lus.Buffer = s;
        lus.Length = (ushort)(s.Length * sizeof(char));
        lus.MaximumLength = (ushort)(lus.Length + sizeof(char));
        return lus;
    }
    }

    class Program
    {
    static void Main(string[] args)
    {
        using (LsaSecurity.LsaWrapper lsa = new LsaSecurity.LsaWrapper())
        {
        lsa.ReadPrivilege("SeBatchLogonRight");
        }
    }
    }
}

}

VB.Net Sample Code:

    Private WinWorldSid As Integer = 1
    Private POLICY_ALL_ACCESS As Integer = &HF0FFF
    Private SECURITY_MAX_SID_SIZE As Integer = 68
    Private SE_DENY_REMOTE_INTERACTIVE_LOGON_NAME As String = "SeDenyRemoteInteractiveLogonRight"
    Private NT_STATUS_OBJECT_NAME_NOT_FOUND As Integer = &HC0000034
    Private STATUS_NO_MORE_ENTRIES As Integer = &H8000001A

    ' Check to see if the Deny permission already exists
    Public Function CheckTS(ByVal PC As String) As Boolean
    Dim ret, Access, sidsize, count, i As Integer
    Dim SystemName, DenyTSRights As LSA_UNICODE_STRING
    Dim ObjectAttr As LSA_OBJECT_ATTRIBUTES
    Dim Policy, EveryoneSID, EnumBuf, ptr As IntPtr
    Dim LsaInfo As LSA_ENUMERATION_INFORMATION
    Dim ans As Boolean

    ' build a well-known SID for "Everyone"
    sidsize = SECURITY_MAX_SID_SIZE
    EveryoneSID = Marshal.AllocHGlobal(sidsize)
    If CreateWellKnownSid(WinWorldSid, IntPtr.Zero, EveryoneSID, sidsize) = False Then
        ret = Marshal.GetLastWin32Error()
        Throw New Win32Exception(ret)
    End If

    ' setup the parameters for the LsaOpenPolicy API
    ObjectAttr.Length = Marshal.SizeOf(ObjectAttr)
    SystemName.Length = PC.Length * UnicodeEncoding.CharSize
    SystemName.MaximumLength = (PC.Length + 1) * UnicodeEncoding.CharSize
    SystemName.Buffer = Marshal.StringToHGlobalUni(PC)
    Access = POLICY_ALL_ACCESS

    ' open a policy handle on the remote PC
    ret = LsaOpenPolicy(SystemName, ObjectAttr, Access, Policy)
    If ret <> 0 Then
        Throw New Win32Exception(LsaNtStatusToWinError(ret))
    End If

    ' clean up
    Marshal.FreeHGlobal(SystemName.Buffer)

    ' Setup the input parameters for the LsaEnumerateAccountsWithUserRight API
    DenyTSRights.Length = SE_DENY_REMOTE_INTERACTIVE_LOGON_NAME.Length * UnicodeEncoding.CharSize
    DenyTSRights.MaximumLength = (SE_DENY_REMOTE_INTERACTIVE_LOGON_NAME.Length + 1) * UnicodeEncoding.CharSize
    DenyTSRights.Buffer = Marshal.StringToHGlobalUni(SE_DENY_REMOTE_INTERACTIVE_LOGON_NAME)

    ' do it!
    ret = LsaEnumerateAccountsWithUserRight(Policy, DenyTSRights, EnumBuf, count)
    If ret <> 0 Then
        Marshal.FreeHGlobal(DenyTSRights.Buffer)
        LsaClose(Policy)
        ' if there are no matching entries
        If ret = STATUS_NO_MORE_ENTRIES Then
        Return False
        End If
        Throw New Win32Exception(LsaNtStatusToWinError(ret))
    End If

    ' check to see if the Everyone SID is currently in the list
    ans = False
    For i = 0 To count - 1
        ptr = New IntPtr(EnumBuf.ToInt32 + (i * Marshal.SizeOf(LsaInfo)))
        LsaInfo = CType(Marshal.PtrToStructure(ptr, GetType(LSA_ENUMERATION_INFORMATION)), LSA_ENUMERATION_INFORMATION)
        If EqualSid(LsaInfo.Sid, EveryoneSID) Then
        ans = True
        Exit For
        End If
    Next

    ' clean up
    LsaFreeMemory(EnumBuf)
    Marshal.FreeHGlobal(DenyTSRights.Buffer)
    LsaClose(Policy)

    Return ans
    End Function

Please edit this page!

Do you have...

• helpful tips or sample code to share for using this API in managed code?
• corrections to the existing content?
• variations of the signature you want to share?
• additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).