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Thread: Is the logged in user a member of a given AD group

  1. #1

    Thread Starter
    Frenzied Member
    Join Date
    Jul 2002
    Location
    Dublin, Ireland
    Posts
    2,044

    Is the logged in user a member of a given AD group

    Code:
           /// <summary>
            /// Returns true if the current logged on user is a member
            /// of the given active directory group
            /// </summary>
            /// <param name="groupname">
            /// The name of the active directory group to check
            /// </param>
            /// <remarks>
            /// If we pass a group name with no root (e.g. no EMEA APAC etc) then
            /// the users own root needs to be used,
            /// </remarks> 
            /// <returns></returns>
            public static bool IsUserInGroup(string groupname)
            {
                if (string.IsNullOrEmpty(groupname))
                {
                    return true;
                }
                else
                {
                    bool _return = false;
    
    
                    AppDomain.CurrentDomain.SetPrincipalPolicy(PrincipalPolicy.WindowsPrincipal);
                    WindowsPrincipal _user = (WindowsPrincipal)System.Threading.Thread.CurrentPrincipal;
                    WindowsIdentity _ident = (WindowsIdentity)_user.Identity;
    
                    string _domainName = @"";
                    string _groupname = @"";
    
    
                    if (groupname.Contains(@"\"))
                    {
                        // use the domain specified
                        _domainName = groupname.Substring(0, groupname.IndexOf(@"\") );
                        _groupname = groupname.Substring(groupname.IndexOf(@"\") + 1);
                    }
                    else
                    {
                        // use the current user domain
                        string _username = _ident.Name;
                        if (_username.Contains(@"\"))
                        {
                            _domainName = _username.Substring(0, _username.IndexOf(@"\") );
                        }
                        _groupname = groupname;
                    }
    
                    foreach (IdentityReference group in _ident.Groups )
                    {
                        NTAccount account = null;
                        try
                        {
                            account = (NTAccount)group.Translate( typeof( NTAccount ) );
                        }                    
                        catch ( IdentityNotMappedException )  
                        { }                   
                        catch ( UnauthorizedAccessException ) 
                        { }                    
                        catch ( SystemException )
                        { }                    
                        if ( account != null )
                        {
                            if (account.Value.Equals(_domainName + @"\" + _groupname, StringComparison.OrdinalIgnoreCase))
                            {
                                _return = true;
                                break;
                            }
                        }
    
                    }
    
                    return _return;   
                }
            }

  2. #2
    New Member
    Join Date
    Dec 2009
    Posts
    1

    Re: Is the logged in user a member of a given AD group

    Thank you so much. Works like a champ.

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