MiniLab

1.0.3

Public/Join-LinuxToAD.ps1

                                <#

    .SYNOPSIS

        This function joins a Linux machine to a Windows Active Directory Domain.

        Currently, this function only supports RedHat/CentOS.

        Most of this function is from:

        https://winsysblog.com/2018/01/join-linux-active-directory-powershell-core.html

    .DESCRIPTION

        See .SYNOPSIS

    .PARAMETER DomainName

        This parameter is MANDATORY.

        This parameter takes a string that represents Active Directory Domain that you would like to join.

    .PARAMETER DomainCreds

        This parameter is MANDATORY.

        This parameter takes a pscredential object that represents a UserName and Password that can join

        a host to teh Active Directory Domain.

    .EXAMPLE

        # Open an elevated PowerShell Core (pwsh) session on a Linux, import the module, and -

        [CentOS7Host] # sudo pwsh

        PS /home/testadmin> $DomainCreds = [pscredential]::new("zero\zeroadmin",$(Read-Host "Enter Password" -AsSecureString))

        PS /home/testadmin> Join-LinuxToAD -DomainName "zero.lab" -DomainCreds $DomainCreds

#>

function Join-LinuxToAD {

    [CmdletBinding()]

    param (

        [Parameter(Mandatory=$True)]

        [string]$DomainName,

        [Parameter(Mandatory=$True)]

        [pscredential]$DomainCreds

    )

    if (!$(GetElevation)) {

        Write-Error "You must run the $($MyInvocation.MyCommand.Name) function with elevated permissions! Halting!"

        $global:FunctionResult = "1"

        return

    }

    if (!$IsLinux) {

        Write-Error "This host is not Linux. Halting!"

        $global:FunctionResult = "1"

        return

    }

    if (![bool]$($PSVersionTable.OS -match 'RedHat|CentOS|\.el[0-9]\.')) {

        Write-Error "Currently, the $(MyInvocation.MyCommand.Name) function only works on RedHat/CentOS Linux Distros! Halting!"

        $global:FunctionResult = "1"

        return

    }

    # Make sure nslookup is installed

    which nslookup *>/dev/null

    if ($LASTEXITCODE -ne 0) {

        $null = yum install bind-utils -y

    }

    # Ensure you can lookup AD DNS

    $null = nslookup $DomainName

    if ($LASTEXITCODE -ne 0) {

        Write-Error 'Could not find domain in DNS. Checking settings'

        $global:FunctionResult = "1"

        return

    }

    #Ensure Samba and dependencies installed

    $DependenciesToInstall = @(

        "sssd"

        "realmd"

        "oddjob"

        "oddjob-mkhomedir"

        "adcli"

        "samba-common"

        "samba-common-tools"

        "krb5-workstation"

        "openldap-clients"

        "policycoreutils-python"

    )

    [System.Collections.ArrayList]$SuccessfullyInstalledDependencies = @()

    [System.Collections.ArrayList]$FailedInstalledDependencies = @()

    foreach ($Dependency in $DependenciesToInstall) {

        $null = yum install $Dependency -y

        if ($LASTEXITCODE -ne 0) {

            $null = $FailedInstalledDependencies.Add($Dependency)

        }

        else {

            $null = $SuccessfullyInstalledDependencies.Add($Dependency)

        }

    }

    if ($FailedInstalledDependencies.Count -gt 0) {

        Write-Error "Failed to install the following dependencies:`n$($FailedInstalledDependencies -join "`n")`nHalting!"

        $global:FunctionResult = "1"

        return

    }

    # Join domain with realm

    $DomainUserName = $DomainCreds.UserName

    if ($DomainUserName -match "\\") {$DomainUserName = $($DomainUserName -split "\\")[-1]}

    $PTPasswd = $DomainCreds.GetNetworkCredential().Password

    printf "$PTPasswd" | realm join $DomainName --user=$DomainUserName

    if ($LASTEXITCODE -ne 0) {

        Write-Error -Message "Could not join domain $DomainName. See error output"

        exit

    }

    if ($LASTEXITCODE -eq 0) {

        Write-Output 'Success'

    }

}

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