Listing All Active Directory Groups

Question

The following code lists some, but not all, Active Directory Groups. Why?

I am trying to list all security groups, distribution groups, computer groups etc. Have I specified the wrong objectClass?

private static void ListGroups()
{
    DirectoryEntry objADAM = default(DirectoryEntry);
    DirectoryEntry objGroupEntry = default(DirectoryEntry);
    DirectorySearcher objSearchADAM = default(DirectorySearcher);
    SearchResultCollection objSearchResults = default(SearchResultCollection);
    SearchResult myResult=null;

    objADAM = new DirectoryEntry(LDAP);
    objADAM.RefreshCache();
    objSearchADAM = new DirectorySearcher(objADAM);
    objSearchADAM.Filter = "(&(objectClass=group))";
    objSearchADAM.SearchScope = SearchScope.Subtree;
    objSearchResults = objSearchADAM.FindAll();

    // Enumerate groups 
    try
    {
        fileGroups.AutoFlush = true;
        if (objSearchResults.Count != 0)
        {
            foreach (SearchResult objResult in objSearchResults)
            {
                myResult = objResult;
                objGroupEntry = objResult.GetDirectoryEntry();
                Console.WriteLine(objGroupEntry.Name);
                fileGroups.WriteLine(objGroupEntry.Name.Substring(3));
            }
        }
        else
        {
            throw new Exception("No groups found");
        }  
    } 
    catch (PrincipalException e)
    {
        fileErrorLog.AutoFlush = true;
        fileErrorLog.WriteLine(e.Message + " " + myResult.Path);
    }
    catch (Exception e)
    {
        throw new Exception(e.Message);
    }
}

Solution 1

If you're on .NET 3.5 or newer, you can use a PrincipalSearcher and a "query-by-example" principal to do your searching:

// create your domain context
PrincipalContext ctx = new PrincipalContext(ContextType.Domain);

// define a "query-by-example" principal - here, we search for a GroupPrincipal 
GroupPrincipal qbeGroup = new GroupPrincipal(ctx);

// create your principal searcher passing in the QBE principal    
PrincipalSearcher srch = new PrincipalSearcher(qbeGroup);

// find all matches
foreach(var found in srch.FindAll())
{
    // do whatever here - "found" is of type "Principal" - it could be user, group, computer.....          
}

If you haven't already - absolutely read the MSDN article Managing Directory Security Principals in the .NET Framework 3.5 which shows nicely how to make the best use of the new features in System.DirectoryServices.AccountManagement

Solution 2

Try filter "(objectcategory=group)" Found solution here

Solution 3

DirectoryEntry entry = new DirectoryEntry("ldap://ldap.gaurangjadia.com", "scott", "tiger");

DirectorySearcher dSearch = new DirectorySearcher(entry);
dSearch.Filter = "(&(objectClass=group))";
dSearch.SearchScope = SearchScope.Subtree;

SearchResultCollection results = dSearch.FindAll();

for (int i = 0; i < results.Count; i++) {
    DirectoryEntry de = results[i].GetDirectoryEntry();

    //TODO with "de"
}

Comments

[cymorg]

Sorry Sergey, same result, not all groups listed. Answer from marc_s seems to work (provided you are on .NET 3.5 or higher).

[El Asiduo]

The link is broken

[VAAA]

Hi What is GetRootDirectoryEntry?

[David Bentley]

I would encapsulate PrincipalContext, GroupPrincipal, and PrincipalSearcher in using blocks since they are disposable.

[JohnB]

This did not give me the right results, but marc_s solution did.

[JohannesB]

Be careful with this as stated in this blogpost, the GetDirectoryEntry() will load ALL properties, including the ones you don't need