# @manojampalam - authored initial script
# @friism - Fixed issue with invalid SDDL on Set-Acl
# @manojampalam - removed ntrights.exe dependency
# @bingbing8 - removed secedit.exe dependency
# @tessgauthier - added permissions check for %programData%/ssh
# @tessgauthier - added update to system path for scp/sftp discoverability

[CmdletBinding(SupportsShouldProcess=$true, ConfirmImpact="High")]
param ()
Set-StrictMode -Version 2.0

$ErrorActionPreference = 'Stop'

if (!([bool]([Security.Principal.WindowsPrincipal] [Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")))
{
    throw "You must be running as an administrator, please restart as administrator"
}

$scriptpath = $MyInvocation.MyCommand.Path
$scriptdir = Split-Path $scriptpath

$sshdpath = Join-Path $scriptdir "sshd.exe"
$sshagentpath = Join-Path $scriptdir "ssh-agent.exe"
$etwman = Join-Path $scriptdir "openssh-events.man"

if (-not (Test-Path $sshdpath)) {
    throw "sshd.exe is not present in script path"
}

if (Get-Service sshd -ErrorAction SilentlyContinue) 
{
   Stop-Service sshd
   sc.exe delete sshd 1>$null
}

if (Get-Service ssh-agent -ErrorAction SilentlyContinue) 
{
   Stop-Service ssh-agent
   sc.exe delete ssh-agent 1>$null
}

# Unregister etw provider
# PowerShell 7.3+ has new/different native command argument parsing
if ($PSVersiontable.PSVersion -le '7.2.9') {
    wevtutil um `"$etwman`"
}
else {
    wevtutil um "$etwman"
}

# adjust provider resource path in instrumentation manifest
[XML]$xml = Get-Content $etwman
$xml.instrumentationManifest.instrumentation.events.provider.resourceFileName = "$sshagentpath"
$xml.instrumentationManifest.instrumentation.events.provider.messageFileName = "$sshagentpath"

$streamWriter = $null
$xmlWriter = $null
try {
    $streamWriter = new-object System.IO.StreamWriter($etwman)
    $xmlWriter = [System.Xml.XmlWriter]::Create($streamWriter)    
    $xml.Save($xmlWriter)
}
finally {
    if($streamWriter) {
        $streamWriter.Close()
    }
}

# Fix the registry permissions
If ($PSVersiontable.PSVersion.Major -le 2) {$PSScriptRoot = Split-Path -Parent $MyInvocation.MyCommand.Path}
Import-Module $PSScriptRoot\OpenSSHUtils -Force
Enable-Privilege SeRestorePrivilege | out-null

$sshRootRegPath="HKLM:SOFTWARE/Openssh"
if (Test-Path $sshRootRegPath)
{
    $sshRootAcl=Get-Acl $sshRootRegPath
    # SDDL - FullAcess to System and Builtin/Admins and read only access to Authenticated users
    $sshRootAcl.SetSecurityDescriptorSddlForm("O:BAG:SYD:P(A;OICI;KR;;;AU)(A;OICI;KA;;;SY)(A;OICI;KA;;;BA)")
    Set-Acl $sshRootRegPath $sshRootAcl
}

$sshAgentRegPath="HKLM:SOFTWARE/Openssh/agent"
if (Test-Path $sshAgentRegPath)
{
    $sshAgentAcl=Get-Acl $sshAgentRegPath
    # SDDL - FullAcess to System and Builtin/Admins.
    $sshAgentAcl.SetSecurityDescriptorSddlForm("O:BAG:SYD:P(A;OICI;KA;;;SY)(A;OICI;KA;;;BA)")
    Set-Acl $sshAgentRegPath  $sshAgentAcl
}

# Create MitigationOptions registry key if it doesn't exist for RedirectionGuard
$sshdMitigationRegPath = "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\sshd.exe"
if (-not (Test-Path $sshdMitigationRegPath)) {
    New-Item -Path $sshdMitigationRegPath -Force | Out-Null
    Write-Host "Created registry key: $sshdMitigationRegPath"
}

# Check if MitigationOptions value exists
$mitigationValue = Get-ItemProperty -Path $sshdMitigationRegPath -Name "MitigationOptions" -ErrorAction SilentlyContinue
if (-not $mitigationValue) {
    # Create binary value: 19 bytes with 0x10 at the end (RedirectionGuard mitigation)
    $binaryData = [byte[]](0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10)
    New-ItemProperty -Path $sshdMitigationRegPath -Name "MitigationOptions" -PropertyType Binary -Value $binaryData -Force | Out-Null
    Write-Host "Created registry value for sshd.exe to enable RedirectionGuard"
}

# Create MitigationOptions registry key if it doesn't exist for RedirectionGuard
$agentMitigationRegPath = "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\ssh-agent.exe"
if (-not (Test-Path $agentMitigationRegPath)) {
    New-Item -Path $agentMitigationRegPath -Force | Out-Null
    Write-Host "Created registry key: $agentMitigationRegPath"
}

# Check if MitigationOptions value exists
$mitigationValue = Get-ItemProperty -Path $agentMitigationRegPath -Name "MitigationOptions" -ErrorAction SilentlyContinue
if (-not $mitigationValue) {
    # Create binary value: 19 bytes with 0x10 at the end (RedirectionGuard mitigation)
    $binaryData = [byte[]](0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10)
    New-ItemProperty -Path $agentMitigationRegPath -Name "MitigationOptions" -PropertyType Binary -Value $binaryData -Force | Out-Null
    Write-Host "Created registry value for ssh-agent.exe to enable RedirectionGuard"
}

#Fix permissions for moduli file
$moduliPath = Join-Path $PSScriptRoot "moduli"
if (Test-Path $moduliPath -PathType Leaf)
{
    # if user calls .\install-sshd.ps1 with -confirm, use that
    # otherwise, need to preserve legacy behavior
    if (-not $PSBoundParameters.ContainsKey('confirm'))
    {
        $PSBoundParameters.add('confirm', $false)
    }
    Repair-ModuliFilePermission -FilePath $moduliPath @psBoundParameters
}

# If %programData%/ssh folder already exists, verify and, if necessary and approved by user, fix permissions 
$sshProgDataPath = Join-Path $env:ProgramData "ssh"
if (Test-Path $sshProgDataPath)
{
    # SSH Folder - owner: System or Admins; full access: System, Admins; read or readandexecute/synchronize permissible: Authenticated Users
    Repair-SSHFolderPermission -FilePath $sshProgDataPath @psBoundParameters
    # Files in SSH Folder (excluding private key files) 
    # owner: System or Admins; full access: System, Admins; read/readandexecute/synchronize permissable: Authenticated Users
    $privateKeyFiles = @("ssh_host_dsa_key", "ssh_host_ecdsa_key", "ssh_host_ed25519_key", "ssh_host_rsa_key")
    Get-ChildItem -Path (Join-Path $sshProgDataPath '*') -Recurse -Exclude ($privateKeyFiles) -Force | ForEach-Object {
        Repair-SSHFolderFilePermission -FilePath $_.FullName @psBoundParameters
    }
    # Private key files - owner: System or Admins; full access: System, Admins
    Get-ChildItem -Path (Join-Path $sshProgDataPath '*') -Recurse -Include $privateKeyFiles -Force | ForEach-Object {
        Repair-SSHFolderPrivateKeyPermission -FilePath $_.FullName @psBoundParameters
    }
}

# Register etw provider
# PowerShell 7.3+ has new/different native command argument parsing
if ($PSVersiontable.PSVersion -le '7.2.9') {
    wevtutil im `"$etwman`"
} else {
    wevtutil im "$etwman"
}

$agentDesc = "Agent to hold private keys used for public key authentication."
New-Service -Name ssh-agent -DisplayName "OpenSSH Authentication Agent" -BinaryPathName "`"$sshagentpath`"" -Description $agentDesc -StartupType Manual | Out-Null
sc.exe sdset ssh-agent "D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)(A;;RP;;;AU)"
sc.exe privs ssh-agent SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege

$sshdDesc = "SSH protocol based service to provide secure encrypted communications between two untrusted hosts over an insecure network."
New-Service -Name sshd -DisplayName "OpenSSH SSH Server" -BinaryPathName "`"$sshdpath`"" -Description $sshdDesc -StartupType Manual | Out-Null
sc.exe privs sshd SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege

Write-Host -ForegroundColor Green "sshd and ssh-agent services successfully installed"

# add folder to system PATH
Add-MachinePath -FilePath $scriptdir @psBoundParameters

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