I have a SID of a user account, and I want the SIDs of the groups it belongs to

Question

This has to be obtained from a remote machine. The following query works not for SIDs, but for group and account names.

"SELECT GroupComponent FROM Win32_GroupUser WHERE PartComponent = \"Win32_UserAccount.Domain='" + accountDomain + "',Name='" + accountName + "'\""

The Win32_Group objects it returns come in the forms of strings, and they only have domain and name (even though Win32_Group has a SID property).

I have this sinking feeling I'll have to:

1. Turn the SID into an account name by querying Win32_SID;
2. Perform the query above;
3. Turn each of the resulting group names into SIDs by querying Win32_Group.

Answer 1

Can you use the System.DirectoryServices.AccountManagement namespace classes?

using (var context = new PrincipalContext( ContextType.Domain ))
{
    using (var user = UserPrincipal.FindByIdentity( context, accountName ))
    {
        var groups = user.GetAuthorizationGroups();
        ...iterate through groups and find SIDs for each one
    }
}

It should work with ContextType.Machine, though you'd need to specify the machine name and have appropriate privileges.

using (var context = new PrincipalContext( ContextType.Machine,
                                           "MyComputer",
                                           userid,
                                           password ))
{
   ...
}

There's a nice MSDN article (longish, though) on using the new .NET 3.5 account management namespace.