Terraform Module for Tenable.io's Nessus Scanner on AWS

This module will set up the latest release of Tenable.io's Nessus (BYOL) scanner from the AWS marketplace. It will also update your machine if you run it again after the release of a newer version of the AMI.

Terraform modules don't always have the options you need out of the box, and I threw this together pretty quickly for use in my environment. However, as long as you can specify a VPC and a subnet, you should be able to use it.

Versioning

This module supports Terraform 0.13 or later. See the branches list for older versions of Terraform.

To pin a version of this module, use a ref link to pin a commit or tag. Tags are the date of a release, nothing fancy.

Usage

In tenable.io's web UI, grab your linking key from the Scans > Scanners page

Inputs

Add this module to your terraform project's source code and provide the following:

• Tenable Linking Key
• VPC ID
• Subnet ID
• (Optional) Instance type, defaults to m5.xlarge
• (Optional) Instance name, defaults to nessus-scanner
• (Optional) Scanner name (a friendly name to show in the Tenable.io UI), defaults to Instance name.
• (Optional) A map of tags to apply to the instance
• (Optional) Extra AMI serach filters, defaults to []

Outputs

The module creates a security group, and you can access that group's id with the security_group_id output. Useful for opening up the AWS firewalls to allow scanning.

Example:

module "nessus_scanner" {
  source = "github.com/BuyerQuest/terraform-tenable-nessus-scanner-aws"

  scanner_name        = "My AWS Nessus Scanner"
  tenable_linking_key = "pvwk5qf5bwsuperfakekeypqv3zcovanqnuawebmv23rj9fofsdcul7aaa"
  vpc_id              = "vpc-31896b55"
  subnet_id           = "subnet-4204d234"
  instance_type       = "t3.xlarge"
  instance_name       = "my-nessus-scanner"

  instance_tags = {
    Role        = "security-scanner"
    Projects    = "tenable"
  }

  extra_filters = [
    {
      name = "image-id"
      values = ["ami-0e2e293e46c009d6f"] # Use a specific AMI instead of the latest available image
    }
  ]
}