Block Active Directory accounts programmatically

Question

I need to block user accounts in Active Directory programmatically in C #.

Unfortunately, this does not work through the userAccountControl attribute. Each time I set userAccountControl to 528 (= a normal account with a lock flag), Active Directory does not accept the value and resets it without further notice to 512 (= a normal account).

Now I tried to lock the account by entering the wrong credentials (see below), but this also does not work.

int retries = 0;
while (!adsUser.IsAccountLocked && retries < MAX_LOCK_RETRIES)
{
     retries++;

    try
    {  
        new DirectoryEntry(userPath, logonName, incorrectPassword).RefreshCache();
    }
    catch (Exception)
    { 
        /* ... */ 
    }
    adsUser.GetInfo();
}

Any ideas?

Answer 1

, , , . . Microsoft.

Answer 2

Active Directory . , LogonUser advapi32.dll. , 100 100 , , , .

, , . . - .

using System;
using System.Runtime.InteropServices;

namespace Test
{
    class Program
    {
        static void Main(string[] args)
        {
            IntPtr token = IntPtr.Zero;
            string userPrincipalName = "[e-mail]";
            string authority = null; // Can be null when using UPN (user principal name)
            string badPassword = "bad";

            int maxTries = 100;
            bool res = false;

            for (var i = 0; i < maxTries; i++)
            {
                res = LogonUser(userPrincipalName, authority, badPassword, LogonSessionType.Interactive, LogonProvider.Default, out token);
                CloseHandle(token);
            }
        }

        [DllImport("advapi32.dll", SetLastError = true)]
        static extern bool LogonUser(
          string principal,
          string authority,
          string password,
          LogonSessionType logonType,
          LogonProvider logonProvider,
          out IntPtr token);

        [DllImport("kernel32.dll", SetLastError = true)]
        static extern bool CloseHandle(IntPtr handle);
        enum LogonSessionType : uint
        {
            Interactive = 2,
            Network,
            Batch,
            Service,
            NetworkCleartext = 8,
            NewCredentials
        }

        enum LogonProvider : uint
        {
            Default = 0, // default for platform (use this!)
            WinNT35,     // sends smoke signals to authority
            WinNT40,     // uses NTLM
            WinNT50      // negotiates Kerb or NTLM
        }
    }
}

Answer 3

This will work if you have a directory entry object.

DirectoryEntry de = result.GetDirectoryEntry();
int val = (int)de.Properties["userAccountControl"].Value;
de.Properties["userAccountControl"].Value = val | 0x0002;

Answer 4

This code will work to block the user in AD

/// <summary>
/// Locks a user account
/// </summary>
/// <param name="userName">The name of the user whose account you want to unlock</param>
/// <remarks>
/// This actually trys to log the user in with a wrong password. 
/// This in turn will lock the user out
/// </remarks>
public void LockAccount(string userName)
{
    DirectoryEntry user = GetUser(userName);
    string path = user.Path;
    string badPassword = "SomeBadPassword";
    int maxLoginAttempts = 10;

    for (int i = 0; i &lt maxLoginAttempts; i++)
    {
        try
        {
            new DirectoryEntry(path, userName, badPassword).RefreshCache();
        }
        catch (Exception e)
        {

        }
    }
    user.Close();
}