Public/Get-LocalUserBelongGroups.ps1

<#
    
    .SYNOPSIS
        Get a local user belong to group list.
    
    .DESCRIPTION
        Get a local user belong to group list. The supported Operating Systems are
        Window Server 2012, Windows Server 2012R2, Windows Server 2016.

    .NOTES
        This function is pulled directly from the real Microsoft Windows Admin Center

        PowerShell scripts use rights (according to Microsoft):
        We grant you a non-exclusive, royalty-free right to use, modify, reproduce, and distribute the scripts provided herein.

        ANY SCRIPTS PROVIDED BY MICROSOFT ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED,
        INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS OR A PARTICULAR PURPOSE.
    
    .ROLE
        Readers

    .PARAMETER UserName
        This parameter is MANDATORY.

        TODO

    .EXAMPLE
        # Open an elevated PowerShell Session, import the module, and -

        PS C:\Users\zeroadmin> Get-LocalUserBelongGroups -UserName jsmith
    
#>

function Get-LocalUserBelongGroups {
    param (
        [Parameter(Mandatory = $true)]
        [String]
        $UserName
    )
    
    Import-Module CimCmdlets -ErrorAction SilentlyContinue
    
    $operatingSystem = Get-CimInstance Win32_OperatingSystem
    $version = [version]$operatingSystem.Version
    # product type 3 is server, version number ge 10 is server 2016
    $isWinServer2016OrNewer = ($operatingSystem.ProductType -eq 3) -and ($version -ge '10.0')
    
    # ADSI does NOT support 2016 Nano, meanwhile net localgroup do NOT support downlevel "net : System error 1312 has occurred."
    
    # Step 1: get the list of local groups
    if ($isWinServer2016OrNewer) {
        $grps = net localgroup | Where-Object {$_ -AND $_ -match "^[*]"}  # group member list as "*%Fws\r\n"
        $groups = $grps.trim('*')
    }
    else {
        $grps = Get-WmiObject -Class Win32_Group -Filter "LocalAccount='True'" | Microsoft.PowerShell.Utility\Select-Object Name
        $groups = $grps.Name
    }
    
    # Step 2: in each group, list members and find match to target $UserName
    $groupNames = @()
    $regex = '^' + $UserName + '\b'
    foreach ($group in $groups) {
        $found = $false
        #find group members
        if ($isWinServer2016OrNewer) {
            $members = net localgroup $group | Where-Object {$_ -AND $_ -notmatch "command completed successfully"} | Microsoft.PowerShell.Utility\Select-Object -skip 4
            if ($members -AND $members.contains($UserName)) {
                $found = $true
            }
        }
        else {
            $groupconnection = [ADSI]("WinNT://localhost/$group,group")
            $members = $groupconnection.Members()
            ForEach ($member in $members) {
                $name = $member.GetType().InvokeMember("Name", "GetProperty", $NULL, $member, $NULL)
                if ($name -AND ($name -match $regex)) {
                    $found = $true
                    break
                }
            }
        }
        #if members contains $UserName, add group name to list
        if ($found) {
            $groupNames = $groupNames + $group
        }
    }
    return $groupNames
    
}

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