How can I add “All Authenticated users” (FBA) to a SharePoint Group using Powershell?

Question

I have an FBA site and I need to add "all authenticated users" to a group using PowerShell. How can I do that?

Answer 1

You cannot add All Authenticated Users in FBA site. You can do it in Windows sites only. There is however a work around as suggested in this link by creating a role in the directory service, add all existing users to it. http://blogs.msdn.com/b/bgeoffro/archive/2008/04/09/adding-an-all-authenticated-users-feature-to-forms-based-authentication.aspx

I wonder whether the link provided by you will be of any help. But here is the Powershell equivalent of that code:

$Url = "http://sitename"
                $GroupName = "group name"
                $PermissionLevel = "Read"
                $Description = "group description"              
                $web = Get-SPWeb -Identity $Url
                if ($web.SiteGroups[$GroupName] -ne $null)
                {
                                Write-Host "Group $GroupName already exists!" -foregroundcolor Red
                }
                else
                {
                                $web.SiteGroups.Add($GroupName, $web.Site.Owner, $web.Site.Owner, $Description)
                                $group = $web.SiteGroups[$GroupName]
                                $roleAssignment = new-object Microsoft.SharePoint.SPRoleAssignment($group)
                                $roleDefinition = $web.Site.RootWeb.RoleDefinitions[$PermissionLevel]
                                $roleAssignment.RoleDefinitionBindings.Add($roleDefinition)
                                $web.RoleAssignments.Add($roleAssignment)
                                $web.Update()
                                Write-Host "Group $GroupName created successfully" -foregroundcolor Green
                }
                $user = "c:0(.s|true"
                $web.SiteGroups[$GroupName].AddUser($user, "", "","")               
                $web.Dispose()