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UserPrincipal.IsMemberOf returns false

I am trying to check that the user is in the "TestGroup" or not. User is in "TestGroup", even I get retval = false @line (retVal = user.IsMemberOf (groupPrincipal);) and in Event Viewer it shows msg as "Username or password is incorrect".

Can you help me with this.

string userName = this.Request.ServerVariables["AUTH_USER"];
if (ValidateUser(userName) == false)
      Response.Redirect("Error.aspx?errormsg=" + userName + " does not have permission to view this page");

 public static bool ValidateUser(String userName)
        {
            bool useGroupAuthorization = true;
            if (useGroupAuthorization)
                return GroupLookup(userName, "TestGroup");            
} 

private static bool GroupLookup(string userName, string groupName)
        {
            System.Diagnostics.EventLog appLog = new System.Diagnostics.EventLog();
            appLog.Source = "Test App";
            bool retVal = false;
            PrincipalContext pc = null;
            UserPrincipal user = null;
            GroupPrincipal groupPrincipal = null;

            try
            {
                string strdomain = "TestDomain"; 
                pc = new PrincipalContext(ContextType.Domain,strdomain);

                user = UserPrincipal.FindByIdentity(pc, userName);

                groupPrincipal = GroupPrincipal.FindByIdentity(pc, groupName);     

                retVal = user.IsMemberOf(groupPrincipal);

            }
            catch (NoMatchingPrincipalException nmpx)
            {              
                appLog.WriteEntry(nmpx.Message);
            }
            catch (PrincipalOperationException pox)
            {
               appLog.WriteEntry(pox.Message);
            }
            catch (Exception ex)
            {
                if (user == null)
                {

                    appLog.WriteEntry(ex.Message);
                }
                else
                {
                    appLog.WriteEntry(ex.Message);
                }
            }
            return retVal;
        }




    // when i tried with below code i am getting userPrincipal is null

     //    bool retVal = false; string strdomain = "TestDomain";
        //    PrincipalContext principalCtx = new PrincipalContext(ContextType.Domain, strdomain);
        //      UserPrincipal queryByExampleUser = new UserPrincipal ( principalCtx );
        //      queryByExampleUser.SamAccountName = userName;
        //      PrincipalSearcher principalSearcher = new PrincipalSearcher ( );
        //      principalSearcher.QueryFilter = queryByExampleUser;
        //      UserPrincipal userPrincipal = principalSearcher.FindOne ( ) as UserPrincipal;

        //      retVal =  IsUserInGroup("TestGroup", userPrincipal);

        //      return retVal;
        // }

        //static bool IsUserInGroup(string groupName, UserPrincipal user)
        //{
        //    PrincipalContext principalContext = new PrincipalContext(ContextType.Domain);
        //    GroupPrincipal groupPrincipal = GroupPrincipal.FindByIdentity(principalContext, groupName);
        //    if (user.IsMemberOf(groupPrincipal))
        //    {
        //        return true;
        //    }
        //    return false;
        //}
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2 answers


UserPrincipal.IsMemberOf (GroupPrincipal) seems to work with some groups and not others. On my domain, it worked with the \ Developers (custom group) domain, but not the \ Domain Users domain. Go figure. I stopped the code in the debugger and looked through the list of domain user group members and found my user there, but IsMemberOf still returned false. However, I found that if I looped through the collection of UserPrincipal objects in GroupPrincipal.Members, I could test this method by comparing the UserPrincipal in the collection to the one I was looking for. Crappy, but the only reliable solution I could find.

Sample code:



string sAccountToCheckSID = upAccountToCheck.Sid.Value;
foreach(UserPrincipal up in gpKnownAccountToCheck.Members)
{
     string sKnownSIDInGroup = up.Sid.Value;
     if(sKnownSIDInGroup.Equals(sAccountToCheckSID))
     {
          userMatchingUserObject = userKnownUser;
          return true;
     }
}

So, I don't have a WHY. But this is my job.

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"gpKnownAccountToCheck.Members" is not recursive.

You need to use the method: GetMembers (recursive: true)



 var result = groupPrincipal
                    .GetMembers(true)
                    .Where(x => x.Sid == userPrincipal.Sid)
                    .Count() > 0;
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