pantheon-systems/wp-tls-compatibility-checker

A scanner for outgoing HTTP requests in WordPress code to check TLS 1.2/1.3 compatibility.

1.0.0 2025-03-07 16:45 UTC

Requires (Dev)

• pantheon-systems/pantheon-wp-coding-standards: ^2.0

MIT

• Chris Reynolds

README

Stable tag: 1.0.0
Contributors: jazzsequence

A scanner for outgoing HTTP requests in WordPress code to check TLS 1.2/1.3 compatibility.

Installation

Via Composer

composer require pantheon-systems/wp-tls-compatibility-checker

Via Git Updater

WP TLS Compatibility Checker supports Andy Fragen's Git Updater method of managing plugins.

1. Download and install Git Updater on your WordPress site.
2. From the Git Updater admin pages, navigate to Install Plugin and use the following values:

Plugin URI: pantheon-systems/wp-tls-compatibility-checker
Repository Branch: main
Remote Repository Host: GitHub
GitHub Access Token: (optional, leave blank)

Manually

1. Download the [latest release on GitHub](https://.
2. Unzip the archive into your WordPress plugins directory (usually /wp-content/plugins/).
3. Upload the plugin to your WordPress site.
4. Activate the plugin.

Usage

There are two ways to use the TLS Checker: via the WordPress admin or via WP-CLI. The plugin adds a new TLS Compatibility page to the Tools menu. This page allows you to run a TLS scan on your site against /wp-content and all subdirectories. When the scan is complete, a list of URLs that are not compatible with TLS 1.2 or higher will be displayed.

You can also run the scan using the WP-CLI command described below. WP-CLI allows you to specify directories to scan, and to output the results in different formats (table, JSON, CSV, or YAML).

In either case, both passing and failing urls are stored to the database. Subsequent scans will automatically skip the TLS check for URLs that are known to have passed previously (while still testing URLs that were previously failing). This data can be reset at any time either by using the tls-checker reset command from WP-CLI or in the admin with the "Reset TLS Compatibility Data" button.

After a scan has been run, if there are any URLs detected that fail the TLS 1.2/1.3 check, an alert will be displayed on your Site Health page with a list of the failing URLs.

Filters

The TLS Compatibility Checker plugin contains two filters that can be used to either explicitly add URLs to scan or exclude URLs from scanning.

pantheon.tls_checker.skip_urls

This filter can be used to exclude URLs from scanning. The filter accepts an array of URLs to skip. For example:

add_filter( 'pantheon.tls_checker.skip_urls', function( $skip_urls ) {
	$skip_urls[] = 'https://example.com';
	return $skip_urls;
} ) ;

pantheon.tls_checker.additional_urls

This filter can be used to add URLs to scan. The filter accepts an array of URLs to add. For example:

add_filter( 'pantheon.tls_checker.additional_urls', function( $additional_urls ) {
	$additional_urls[] = 'https://example.com';
	return $additional_urls;
} ) ;

Extending the plugin

All the functions in inc/core.php are globally declared, allowing you to use any of them in your own code.

WP-CLI Commands

The TLS Checker can be run from the command line with WP-CLI.

run

Runs the TLS checker scan across all PHP files in the given directories (defaults to /mu-plugins, /themes and /plugins). You can specify a directory by passing a --directory flag, e.g.:

wp tls-checker run --directory=/path/to/my/directory

Examples

wp tls-checker scan

wp tls-checker scan --directory=/private/scripts/quicksilver

Or, in a Pantheon environment using Terminus:

terminus wp -- <site>.<env> tls-checker scan

report

Returns a full report of checked URLs and whether they passed or failed the TLS check. Supports multiple formats (table, JSON, CSV, YAML).

Examples

wp tls-checker report

wp tls-checker report --format=json | jq

wp tls-checker report --format=csv

Or, in a Pantheon environment using Terminus:

terminus wp -- <site>.<env> tls-checker report

reset

Resets the stored passing and failing URLs so the next scan will re-check all discovered URLs.

Examples

wp tls-checker reset

terminus wp -- <site>.<env> tls-checker reset

How do I know it worked?

If the scan doesn't find anything bad, you should be good to go. If it does, it will list the URLs that it found that weren't compatible. However, if you want to validate that it's working, you can create a new plugin with the following code:

<?php
/**
 * Plugin Name: TLS checker bad plugin
 * Description: Makes a request against a known bad (non-TLS 1.2+) URL
 * Version: 1.3
 * Author: Pantheon Systems
 */
add_action( 'admin_init', function() {
	print_r( wp_remote_get( 'https://tls-v1-1.badssl.com:1011/' ) );
});

When you run the command, the URL above should be returned as a host that does NOT support TLS 1.2 or higher.