Installs open ssh and sets the key as an admin on the machine

install-openssh.ps1

param(
    [string] $key
)

$adminpath = "c:\ProgramData\ssh"
$adminfile = "administrators_authorized_keys"

Write-Host "Installing OpenSSH"
$isAvailable = Get-WindowsCapability -Online | ? Name -like 'OpenSSH*'

if (!$isAvailable) {
    Write-Error "OpenSSH is not avaliable on this machine"
    exit 1
}

Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0

Start-Service sshd

if (!(Test-Path "$adminpath")) {
    Write-Host "Created new file and text content added"
    New-Item -path $adminpath -name $adminfile -type "file" -value ""
}

Write-Host "$adminpath found."
Write-Host "Adding key to: $adminpath\$adminfile ..."
Add-Content $adminpath\$adminfile $key

Write-Host "Setting required permissions..."
icacls $adminpath\$adminfile /remove "NT AUTHORITY\Authenticated Users"
icacls $adminpath\$adminfile /inheritance:r

Write-Host "Restarting sshd service..."
Restart-Service sshd
Set-Service -Name sshd -StartupType 'Automatic'

# Confirm the Firewall rule is configured. It should be created automatically by setup. 
$firewall = Get-NetFirewallRule -Name *ssh*

if (!$firewall) {
    Write-Error "OpenSSH is firewall is not configured properly"
    exit 1
}
Write-Host "OpenSSH installed and configured successfully"