Deploy-IT/main.tf at main · D-VSec/Deploy-IT · GitHub

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terraform {
  required_providers {
    azurerm = {
      source  = "hashicorp/azurerm"
      version = "~> 4.0"
    }
    cloudflare = {
      source  = "cloudflare/cloudflare"
      version = "~> 5.0"
    }
  }
}

provider "azurerm" {
  features {}
  client_id       = var.client_id
  client_secret   = var.client_secret
  tenant_id       = var.tenant_id
  subscription_id = var.subscription_id
}


# -- Resources --
resource "azurerm_resource_group" "vm_rg" {
  name     = "tf-vm-rg"
  location = var.location
}

resource "azurerm_virtual_network" "vm_vnet" {
  name                = "tf-vnet"
  address_space       = ["10.0.0.0/16"]
  location            = azurerm_resource_group.vm_rg.location
  resource_group_name = azurerm_resource_group.vm_rg.name
}

resource "azurerm_subnet" "vm_subnet" {
  name                 = "tf-subnet"
  resource_group_name  = azurerm_resource_group.vm_rg.name
  virtual_network_name = azurerm_virtual_network.vm_vnet.name
  address_prefixes     = ["10.0.1.0/24"]
}

resource "azurerm_public_ip" "vm_public_ip" {
  name                = "tf-public-ip"
  location            = azurerm_resource_group.vm_rg.location
  resource_group_name = azurerm_resource_group.vm_rg.name
  allocation_method   = "Static"
  sku                 = "Standard"
}

resource "azurerm_network_interface" "vm_nic" {
  name                = "tf-nic"
  location            = azurerm_resource_group.vm_rg.location
  resource_group_name = azurerm_resource_group.vm_rg.name

  ip_configuration {
    name                          = "internal"
    subnet_id                     = azurerm_subnet.vm_subnet.id
    private_ip_address_allocation = "Dynamic"
    public_ip_address_id          = azurerm_public_ip.vm_public_ip.id
  }
}

resource "azurerm_linux_virtual_machine" "vm" {
  name                = "tf-linux-vm"
  resource_group_name = azurerm_resource_group.vm_rg.name
  location            = azurerm_resource_group.vm_rg.location
  size                = "Standard_B1s"
  admin_username      = var.admin_username

  # SSH KEY CONFIG
  disable_password_authentication = true
  admin_ssh_key {
    username   = var.admin_username
    public_key = var.admin_public_key
  }

  network_interface_ids = [azurerm_network_interface.vm_nic.id]

  os_disk {
    caching              = "ReadWrite"
    storage_account_type = "Standard_LRS"
  }

  source_image_reference {
    publisher = "Canonical"
    offer     = "0001-com-ubuntu-server-jammy"
    sku       = "22_04-lts"
    version   = "latest"
  }
}

# --- Security ---
resource "azurerm_network_security_group" "vm_nsg" {
  name                = "tf-vm-nsg"
  location            = azurerm_resource_group.vm_rg.location
  resource_group_name = azurerm_resource_group.vm_rg.name
}

# Allow SSH (Ideally restrict 'source_address_prefix' to your IP only)
resource "azurerm_network_security_rule" "ssh_rule" {
  name                        = "Allow-SSH"
  priority                    = 1001
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Tcp"
  source_port_range           = "*"
  destination_port_range      = "22"
  source_address_prefix       = "*"
  destination_address_prefix  = "*"
  resource_group_name         = azurerm_resource_group.vm_rg.name
  network_security_group_name = azurerm_network_security_group.vm_nsg.name
}

# RESTRICTED HTTPS: Only Cloudflare IPs can access Port 443
resource "azurerm_network_security_rule" "allow_cloudflare_only" {
  name                        = "AllowCloudflareHTTPS"
  priority                    = 100
  direction                   = "Inbound"
  access                      = "Allow"
  protocol                    = "Tcp"
  source_port_range           = "*"
  destination_port_ranges     = ["443"]
  source_address_prefixes     = data.cloudflare_ip_ranges.cloudflare.ipv4_cidrs
  destination_address_prefix  = "*"
  resource_group_name         = azurerm_resource_group.vm_rg.name
  network_security_group_name = azurerm_network_security_group.vm_nsg.name
}

resource "azurerm_network_interface_security_group_association" "vm_nsg_assoc" {
  network_interface_id      = azurerm_network_interface.vm_nic.id
  network_security_group_id = azurerm_network_security_group.vm_nsg.id
}