Support for JsonBody in fields to match on WAF ByteMatch rule

[chrisportela]

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Description

Was trying to implement some WAF rules and noticed that the Console lets you make ones which target the parsed JsonBody instead of the raw Body.

This feature was released Feb 2021 and would be very helpful in blocking invalid requests.

New or Affected Resource(s)

• aws_wafv2_web_acl

Potential Terraform Configuration

Just the statement portion for hypothetically ensuring a graphql query has "viewer" somewhere in the query field.

statement {
    byte_match_statement {
    field_to_match {
      json_body = {
        match_scope = "ALL"
        invalid_fallback_behavior = "NO_MATCH"
        match_pattern = {
          included_paths = ["/query"]
        }
      }
    }
    positional_constraint = "CONTAINS_WORD"
    search_string = "viewer"
    text_transformation = {
      priority = 0
      type = "NONE"
    }
  }
}

References

• Blog post announcing new feature
• AWS Documentation on Rules

[nevelis]

It's been over a year since this feature came out, and nearly as long since this was reported. One of our rules requires json_body and we cannot describe our WAF infrastructure without this.

Given that there is no activity on this, I'm hoping someone has had some luck with a workaround. Any ideas short of using a null_resource with the CLI to do this properly? :(

[steveorourke]

Blocked on this as well. I'll put together a PR, if no one else has made a start.

[tiborhercz]

I see that this PR is stale for a long time. Which is a shame because of the work that is done by @steveorourke.
I will review and test the code and make sure it will get merged.

[tiborhercz]

Code has been reviewed and tested. LGMT! 👍🏼
@steveorourke I have suggested some small changes to the code and documentation. Let me know what you think

[steveorourke]

Thanks @tiborhercz. I've accepted all suggestions.

[tiborhercz]

Thanks @steveorourke
Code has been reviewed and tested. LGMT! 👍🏼

@bschaatsbergen Could you please also take a look?

[github-actions]

This functionality has been released in v4.29.0 of the Terraform AWS Provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

For further feature requests or bug reports with this functionality, please create a new GitHub issue following the template. Thank you!

[github-actions]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems similar to this, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.