Active Directory (LDAP) - Check account locked out / Password expired

Question

Currently I authenticate users against some AD using the following code:

DirectoryEntry entry = new DirectoryEntry(_path, username, pwd);

try
{
    // Bind          


        

Answer 1

I know this answer is a few years late, but we just ran into the same situation as the original poster. Unfortunately, in our environment, we can't use LogonUser -- we needed a pure LDAP solution. It turns out there is a way to get the extended error code from a bind operation. It's a bit ugly, but it works:

catch(DirectoryServicesCOMException exc)
{
    if((uint)exc.ExtendedError == 0x80090308)
    {
        LDAPErrors errCode = 0;

        try
        {
            // Unfortunately, the only place to get the LDAP bind error code is in the "data" field of the 
            // extended error message, which is in this format:
            // 80090308: LdapErr: DSID-0C09030B, comment: AcceptSecurityContext error, data 52e, v893
            if(!string.IsNullOrEmpty(exc.ExtendedErrorMessage))
            {
                Match match = Regex.Match(exc.ExtendedErrorMessage, @" data (?[0-9A-Fa-f]+),");
                if(match.Success)
                {
                    string errCodeHex = match.Groups["errCode"].Value;
                    errCode = (LDAPErrors)Convert.ToInt32(errCodeHex, fromBase: 16);
                }
            }
        }
        catch { }

        switch(errCode)
        {
            case LDAPErrors.ERROR_PASSWORD_EXPIRED:
            case LDAPErrors.ERROR_PASSWORD_MUST_CHANGE:
                throw new Exception("Your password has expired and must be changed.");

            // Add any other special error handling here (account disabled, locked out, etc...).
        }
    }

    // If the extended error handling doesn't work out, just throw the original exception.
    throw;
}

And you'll need definitions for the error codes (there are a lot more of these at http://www.lifeasbob.com/code/errorcodes.aspx):

private enum LDAPErrors
{
    ERROR_INVALID_PASSWORD = 0x56,
    ERROR_PASSWORD_RESTRICTION = 0x52D,
    ERROR_LOGON_FAILURE = 0x52e,
    ERROR_ACCOUNT_RESTRICTION = 0x52f,
    ERROR_INVALID_LOGON_HOURS = 0x530,
    ERROR_INVALID_WORKSTATION = 0x531,
    ERROR_PASSWORD_EXPIRED = 0x532,
    ERROR_ACCOUNT_DISABLED = 0x533,
    ERROR_ACCOUNT_EXPIRED = 0x701,
    ERROR_PASSWORD_MUST_CHANGE = 0x773,
    ERROR_ACCOUNT_LOCKED_OUT = 0x775,
    ERROR_ENTRY_EXISTS = 0x2071,
}

I couldn't find this information anywhere else -- everyone just says you should use LogonUser. If there's a better solution, I'd love to hear it. If not, I hope this helps other people who can't call LogonUser.