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boundary/enos/modules/aws_rdp_member_server/main.tf

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# Copyright (c) HashiCorp, Inc.
# SPDX-License-Identifier: BUSL-1.1
terraform {
required_version = ">= 1.1.2"
required_providers {
enos = {
source = "registry.terraform.io/hashicorp-forge/enos"
}
}
}
data "enos_environment" "current" {}
data "aws_caller_identity" "current" {}
data "aws_ami" "infra" {
most_recent = true
owners = ["amazon"]
filter {
name = "name"
values = ["Windows_Server-${var.server_version}-English-Full-Base*"]
}
}
data "aws_vpc" "infra" {
id = var.vpc_id
}
data "aws_subnets" "infra" {
filter {
name = "vpc-id"
values = [var.vpc_id]
}
}
locals {
username = split(":", data.aws_caller_identity.current.user_id)[1]
domain_parts = split(".", var.active_directory_domain)
domain_sld = local.domain_parts[0] # second-level domain (example.com --> example)
domain_tld = local.domain_parts[1] # top-level domain (example.com --> com)
}
resource "aws_instance" "member_server" {
ami = data.aws_ami.infra.id
instance_type = var.instance_type
vpc_security_group_ids = var.domain_controller_sec_group_id_list
key_name = var.domain_controller_aws_keypair_name
subnet_id = data.aws_subnets.infra.ids[0]
ipv6_address_count = 1
root_block_device {
volume_type = "gp2"
volume_size = var.root_block_device_size
delete_on_termination = "true"
encrypted = true
}
user_data_replace_on_change = true
user_data = <<EOF
<powershell>
# Configure the server to use reliable external NTP sources and mark itself as reliable
# We use pool.ntp.org, a public cluster of time servers. 0x9 flag means Client + SpecialInterval.
w32tm /config /manualpeerlist:"pool.ntp.org,0x9" /syncfromflags:manual /reliable:yes /update
# Restart the Windows Time service to apply the new configuration
Stop-Service w32time
Start-Service w32time
# Force an immediate time synchronization
w32tm /resync /force
# Set up SSH so we can remotely manage the instance
# Note: Windows Server 2016 does not support OpenSSH
%{if var.server_version != "2016"~}
# set variables for retry loops
$timeout = 300
$interval = 30
# Install OpenSSH Server and Client
# Loop to make sure that SSH installs correctly
$elapsed = 0
do {
try {
Add-WindowsCapability -Online -Name OpenSSH.Server~~~~0.0.1.0
Set-Service -Name sshd -StartupType 'Automatic'
Start-Service sshd
$result = Get-Process -Name "sshd" -ErrorAction SilentlyContinue
if ($result) {
Write-Host "Successfully added and started openSSH server"
break
}
} catch {
Write-Host "SSH server was not installed, retrying"
Start-Sleep -Seconds $interval
$elapsed += $interval
}
if ($elapsed -ge $timeout) {
Write-Host "SSH server installation failed after 5 minutes. Exiting."
exit 1
}
} while ($true)
$elapsed = 0
do {
try {
Add-WindowsCapability -Online -Name OpenSSH.Client~~~~0.0.1.0
Set-Service -Name ssh-agent -StartupType Automatic
Start-Service ssh-agent
$result = Get-Process -Name "ssh-agent" -ErrorAction SilentlyContinue
if ($result) {
Write-Host "Successfully added and started openSSH agent"
break
}
} catch {
Write-Host "SSH server was not installed, retrying"
Start-Sleep -Seconds $interval
$elapsed += $interval
}
if ($elapsed -ge $timeout) {
Write-Host "SSH server installation failed after 5 minutes. Exiting."
exit 1
}
} while ($true)
# Set PowerShell as the default SSH shell
New-ItemProperty -Path "HKLM:\SOFTWARE\OpenSSH" -Name DefaultShell -Value (Get-Command powershell.exe).Path -PropertyType String -Force
# Configure SSH server to use private key authentication so that scripts don't have to use passwords
# Save the private key from instance metadata
$ImdsToken = (Invoke-WebRequest -Uri 'http://169.254.169.254/latest/api/token' -Method 'PUT' -Headers @{'X-aws-ec2-metadata-token-ttl-seconds' = 2160} -UseBasicParsing).Content
$ImdsHeaders = @{'X-aws-ec2-metadata-token' = $ImdsToken}
$AuthorizedKey = (Invoke-WebRequest -Uri 'http://169.254.169.254/latest/meta-data/public-keys/0/openssh-key' -Headers $ImdsHeaders -UseBasicParsing).Content
$AuthorizedKeysPath = 'C:\ProgramData\ssh\administrators_authorized_keys'
New-Item -Path $AuthorizedKeysPath -ItemType File -Value $AuthorizedKey -Force
# Set the correct permissions on the authorized_keys file
icacls "C:\ProgramData\ssh\administrators_authorized_keys" /inheritance:r
icacls "C:\ProgramData\ssh\administrators_authorized_keys" /grant "Administrators:F" /grant "SYSTEM:F"
icacls "C:\ProgramData\ssh\administrators_authorized_keys" /remove "Users"
icacls "C:\ProgramData\ssh\administrators_authorized_keys" /remove "Authenticated Users"
# Ensure the SSH agent pulls in the new key.
Set-Service -Name ssh-agent -StartupType "Automatic"
Restart-Service -Name ssh-agent
Restart-Service -Name sshd
# Open the firewall for SSH connections
New-NetFirewallRule -Name sshd -DisplayName 'OpenSSH Server (sshd)' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 22
%{endif~}
# Open firewall ports for RDP functionality
New-NetFirewallRule -Name kerberostcp -DisplayName 'Kerberos TCP' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 88
New-NetFirewallRule -Name kerberosudp -DisplayName 'Kerberos UDP' -Enabled True -Direction Inbound -Protocol UDP -Action Allow -LocalPort 88
New-NetFirewallRule -Name rpctcp -DisplayName 'RPC TCP ' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 135
New-NetFirewallRule -Name rpcudp -DisplayName 'RPC UDP' -Enabled True -Direction Inbound -Protocol UDP -Action Allow -LocalPort 135
New-NetFirewallRule -Name ldaptcp -DisplayName 'LDAP TCP ' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 389
New-NetFirewallRule -Name ldapudp -DisplayName 'LDAP UDP' -Enabled True -Direction Inbound -Protocol UDP -Action Allow -LocalPort 389
New-NetFirewallRule -Name smbtcp -DisplayName 'SMB TCP ' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 445
New-NetFirewallRule -Name rdptcp -DisplayName 'RDP TCP ' -Enabled True -Direction Inbound -Protocol TCP -Action Allow -LocalPort 3389
New-NetFirewallRule -Name rdpudp -DisplayName 'RDP UDP' -Enabled True -Direction Inbound -Protocol UDP -Action Allow -LocalPort 3389
# Adds member server to the domain
[int]$intix = Get-NetAdapter | % { Process { If ( $_.Status -eq "up" ) { $_.ifIndex } }}
Set-DNSClientServerAddress -interfaceIndex $intix -ServerAddresses ("${var.domain_controller_ip}","127.0.0.1")
$here_string_password = @'
${var.domain_admin_password}
'@
$password = ConvertTo-SecureString $here_string_password -AsPlainText -Force
$username = "${local.domain_sld}\Administrator"
$credential = New-Object System.Management.Automation.PSCredential($username,$password)
# check that domain can be reached
$timeout = 300
$interval = 10
$elapsed = 0
# check that domain can be reached
do {
try {
Resolve-DnsName -Name "${var.active_directory_domain}" -Server "${var.domain_controller_ip}" -ErrorAction Stop
Write-Host "resolved domain successfully."
break
} catch {
Write-Host "Could not resolve domain. Retrying in $interval seconds..."
Start-Sleep -Seconds $interval
$elapsed += $interval
}
if ($elapsed -ge $timeout) {
Write-Host "Resovling domain after 5 minutes. Exiting."
exit 1
}
} while ($true)
#logging to troubleshoot domain issues
Resolve-DnsName -Name "${var.active_directory_domain}" -Server "${var.domain_controller_ip}" -ErrorAction SilentlyContinue
Get-Service -Name LanmanWorkstation, Netlogon, RpcSs | Select-Object Name, DisplayName, Status
# Add computer to domain
$elapsed = 0
do {
try {
Add-Computer -DomainName "${var.active_directory_domain}" -Credential $credential
$result = (Get-WmiObject Win32_ComputerSystem).Domain
if ($result -ne "WORKGROUP") {
Write-Host "Added to domain successfully."
break
}
} catch {
Write-Host "Could not add to domain. Retrying in $interval seconds..."
Start-Sleep -Seconds $interval
$elapsed += $interval
}
if ($elapsed -ge $timeout) {
Write-Host "Adding to domain after 5 minutes. Exiting."
exit 1
}
} while ($true)
# Logging to determine domain and ssh state for debugging
(Get-WmiObject Win32_ComputerSystem).Domain
Get-Process -Name *ssh* -ErrorAction SilentlyContinue
# Enable Kerberos only authentication if required
%{if var.kerberos_only~}
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0" -Name RestrictSendingNTLMTraffic -Value 2
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\Lsa\MSV1_0" -Name RestrictReceivingNTLMTraffic -Value 2
%{endif~}
# Enable audio
Set-Service -Name "Audiosrv" -StartupType Automatic
Start-Service -Name "Audiosrv"
Restart-Computer -Force
</powershell>
EOF
metadata_options {
http_endpoint = "enabled"
http_tokens = "required"
instance_metadata_tags = "enabled"
}
get_password_data = true
tags = {
Name = "${var.prefix}-rdp-member-server-${local.username}"
}
}
locals {
password = rsadecrypt(aws_instance.member_server.password_data, file(var.domain_controller_private_key))
private_key = abspath(var.domain_controller_private_key)
}
resource "time_sleep" "wait_2_minutes" {
depends_on = [aws_instance.member_server]
create_duration = "2m"
}
# wait for the SSH service to be available on the instance. We specifically use
# BatchMode=Yes to prevent SSH from prompting for a password to ensure that we
# can just SSH using the private key
resource "enos_local_exec" "wait_for_ssh" {
count = var.server_version != "2016" ? 1 : 0
depends_on = [time_sleep.wait_2_minutes]
inline = ["timeout 600s bash -c 'until ssh -i ${local.private_key} -o BatchMode=Yes -o IdentitiesOnly=yes -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no Administrator@${aws_instance.member_server.public_ip} \"echo ready\"; do sleep 10; done'"]
}
# Retrieve the domain hostname of the member server, which will be used in
# Kerberos
resource "enos_local_exec" "get_hostname" {
count = var.server_version != "2016" ? 1 : 0
depends_on = [
enos_local_exec.wait_for_ssh,
]
inline = ["ssh -i ${local.private_key} -o IdentitiesOnly=yes -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no Administrator@${aws_instance.member_server.public_ip} '$env:COMPUTERNAME'"]
}