Baseline DNS records

This is a Terrafrom module to set baseline DNS records in a Route53 zone.

Records created:

1. DMARC (_dmarc.example.com TXT ...)
2. MX (example.com MX ...)
3. DKIM catch-unused (*._domainkey.example.com TXT ...)
4. CAA (example.com CAA ...)
5. TXT for SPF (example.com TXT ...)

The default values in variables.tf follow suggestions from the UK National Cyber Security Centre for parked domains, to help prevent use in email spoofing/phishing attacks.

The default CAA value prohibits all certificate issuance.

How to use:

1. Add a module definition to your Terraform. See the example below.
2. Update route53_zone_name = ... to match your zone name.
3. Update route53_zone_id = ... to match your zone ID.
4. Optional: Uncomment and update the other example values to match your requirements.

module "baseline-dns-records" {
  source = "git::https://github.com/brightbock/baseline-dns-records-tf.git?ref=v0.4.0"
  
  route53_zone_name = "example.com"
  route53_zone_id = "ABCDEXAMPLE1234"

  #caa_list = [
  #  "0 issue \"amazon.com\"",
  #  "0 issue \"amazonaws.com\"",
  #  "0 issue \"amazontrust.com\"",
  #  "0 issue \"awstrust.com\""
  #]

  #dmarc_txt = ["v=DMARC1; p=reject; sp=reject;"]

  #root_txt = [
  #  "v=spf1 include:_spf.google.com ~all",
  #  "foo=bar"
  #]

  #mx_list = [
  #  "1 aspmx.l.google.com",
  #  "5 alt1.aspmx.l.google.com",
  #  "5 alt2.aspmx.l.google.com",
  #  "10 alt3.aspmx.l.google.com",
  #  "10 alt4.aspmx.l.google.com"
  #]
}

Warning:

This module will overwrite corresponding records that already exist. Please take care to set appropriate values, especially for mx_list and root_txt.