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<?php |
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/** |
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* HTTPS Enforcer Class |
| 4 |
* |
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* Forces HTTPS across the site |
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* |
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* @package Vigilante |
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*/ |
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|
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// Prevent direct access |
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if ( ! defined( 'ABSPATH' ) ) { |
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exit; |
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} |
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|
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/** |
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* Class Vigilante_Https_Enforcer |
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* |
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* Enforces HTTPS connections and fixes mixed content |
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*/ |
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class Vigilante_Https_Enforcer { |
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|
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/** |
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* Settings instance |
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* |
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* @var Vigilante_Settings |
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*/ |
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private $settings; |
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|
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/** |
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* HTTPS options |
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* |
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* @var array |
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*/ |
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private $options; |
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|
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/** |
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* Whether the output buffer was started by this class |
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* |
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* @var bool |
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*/ |
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private $ob_started = false; |
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|
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/** |
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* Nesting level of the buffer opened by this class. |
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* |
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* Recorded so shutdown can tell whether the buffer on top is still ours. |
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* |
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* @var int |
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*/ |
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private $ob_level = 0; |
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|
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/** |
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* Constructor |
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* |
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* @param Vigilante_Settings $settings Settings instance. |
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*/ |
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public function __construct( $settings ) { |
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$this->settings = $settings; |
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$this->options = $settings->get_section( 'security_headers' ); |
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|
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if ( empty( $this->options['enabled'] ) ) { |
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return; |
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} |
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|
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// Redirect HTTP to HTTPS |
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if ( ! empty( $this->options['redirect_http_to_https'] ) ) { |
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add_action( 'template_redirect', array( $this, 'redirect_to_https' ), 1 ); |
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add_action( 'admin_init', array( $this, 'redirect_to_https' ), 1 ); |
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} |
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|
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// Fix mixed content |
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if ( ! empty( $this->options['fix_mixed_content'] ) ) { |
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add_action( 'wp_loaded', array( $this, 'start_output_buffer' ) ); |
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add_action( 'shutdown', array( $this, 'end_output_buffer' ), 0 ); |
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add_filter( 'script_loader_src', array( $this, 'fix_url_scheme' ), 10, 1 ); |
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add_filter( 'style_loader_src', array( $this, 'fix_url_scheme' ), 10, 1 ); |
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add_filter( 'wp_get_attachment_url', array( $this, 'fix_url_scheme' ), 10, 1 ); |
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add_filter( 'the_content', array( $this, 'fix_content_urls' ), 999 ); |
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add_filter( 'widget_text', array( $this, 'fix_content_urls' ), 999 ); |
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|
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} |
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|
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// Its own setting since 2.9.8: the rewriters above are same-domain and |
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// harmless, this one governs everybody else's resources too. |
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if ( ! empty( $this->options['upgrade_insecure_requests'] ) ) { |
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add_action( 'send_headers', array( $this, 'emit_upgrade_insecure_requests' ) ); |
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} |
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} |
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|
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/** |
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* Redirect HTTP requests to HTTPS |
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*/ |
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public function redirect_to_https() { |
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// Skip if already HTTPS |
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if ( is_ssl() ) { |
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return; |
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} |
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|
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/* |
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* Only redirect when the site itself declares HTTPS. A site whose home |
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* URL is still http:// has not moved to HTTPS, and sending every request |
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* to an address that may not answer takes it offline outright. Read from |
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* the home option (which honours the WP_HOME constant through the |
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* option_home filter) rather than home_url(), so the answer is the |
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* address the site declares and not one derived from the current |
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* request. A site already on HTTPS has an https home URL and keeps |
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* redirecting exactly as before. |
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*/ |
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if ( 0 !== strpos( (string) get_option( 'home' ), 'https://' ) ) { |
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return; |
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} |
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|
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// Skip CLI |
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if ( defined( 'WP_CLI' ) && WP_CLI ) { |
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return; |
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} |
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|
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// Skip AJAX requests |
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if ( wp_doing_ajax() ) { |
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return; |
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} |
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|
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// Skip cron |
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if ( wp_doing_cron() ) { |
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return; |
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} |
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|
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// Build HTTPS URL |
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$redirect_url = 'https://' . ( isset( $_SERVER['HTTP_HOST'] ) ? sanitize_text_field( wp_unslash( $_SERVER['HTTP_HOST'] ) ) : '' ); |
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$redirect_url .= isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : ''; |
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|
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// Redirect with 301 (permanent) |
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wp_safe_redirect( $redirect_url, 301 ); |
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exit; |
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} |
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|
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/** |
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* Send the CSP upgrade-insecure-requests directive on the front end. |
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* |
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* The mixed-content rewriter only fixes same-domain URLs (its patterns |
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* are anchored to home_url()), so references to EXTERNAL http:// |
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* resources survived and the Security Check kept flagging them, which |
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* read as "Fix mixed content does nothing". This directive makes the |
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* browser upgrade every subrequest, external ones included. |
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* |
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* Always emitted, without checking the CSP module settings: Vigilant's |
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* own CSP travels via .htaccess, so "csp enabled" in the options does |
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* not guarantee the header is actually served (Nginx, unwritable |
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* .htaccess, mod_headers missing). Multiple CSP headers stack in the |
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* browser (every policy applies) and this directive alone restricts |
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* nothing, so a duplicate is harmless while a missed emission is not. |
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* |
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* @since 2.9.3 |
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*/ |
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public function emit_upgrade_insecure_requests() { |
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if ( ! is_ssl() || headers_sent() ) { |
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return; |
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} |
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|
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header( 'Content-Security-Policy: upgrade-insecure-requests', false ); |
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} |
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|
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/** |
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* Start output buffering to fix mixed content |
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*/ |
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public function start_output_buffer() { |
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if ( ! is_ssl() ) { |
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return; |
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} |
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|
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// The rewriter only touches complete HTML documents (fix_output_buffer() |
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// bails on anything without <html or <!DOCTYPE), so buffering the admin, |
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// AJAX and REST responses pays for a buffer and a callback that can never |
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// do any work. On a WooCommerce site the cart-fragments endpoint alone is |
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// dozens of those per visitor. |
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if ( is_admin() || wp_doing_ajax() || $this->is_rest_request() ) { |
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return; |
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} |
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|
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ob_start( array( $this, 'fix_output_buffer' ) ); |
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$this->ob_started = true; |
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$this->ob_level = ob_get_level(); |
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} |
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|
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/** |
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* Whether the current request is a REST API request. |
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* |
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* REST_REQUEST is only defined once the request is being served, which is |
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* after wp_loaded, so the REST route prefix is checked as well. |
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* |
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* @return bool |
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*/ |
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private function is_rest_request() { |
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if ( defined( 'REST_REQUEST' ) && REST_REQUEST ) { |
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return true; |
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} |
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|
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if ( ! isset( $_SERVER['REQUEST_URI'] ) ) { |
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return false; |
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} |
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|
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$path = wp_parse_url( sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ), PHP_URL_PATH ); |
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$prefix = '/' . trim( rest_get_url_prefix(), '/' ) . '/'; |
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|
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return is_string( $path ) && 0 === strpos( $path, $prefix ); |
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} |
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|
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/** |
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* Explicitly close the output buffer on shutdown. |
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* |
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* Ensures the buffer opened by start_output_buffer() is always |
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* properly closed within the same logical flow. |
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*/ |
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public function end_output_buffer() { |
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// Only flush when the buffer on top is exactly the one we opened. Testing |
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// for "is there any buffer at all" would close somebody else's buffer when |
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// another plugin opened one after ours and had not closed it yet, leaving |
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// ours open on top of that. When the levels do not match, doing nothing is |
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// the safe move: PHP flushes what is left at the end of the request. |
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if ( $this->ob_started && ob_get_level() === $this->ob_level ) { |
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ob_end_flush(); |
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$this->ob_started = false; |
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} |
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} |
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|
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/** |
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* Fix URLs in output buffer |
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* |
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* @param string $content Buffer content. |
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* @return string |
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*/ |
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public function fix_output_buffer( $content ) { |
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if ( empty( $content ) ) { |
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return $content; |
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} |
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|
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// Only process HTML content |
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if ( strpos( $content, '<html' ) === false && strpos( $content, '<!DOCTYPE' ) === false ) { |
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return $content; |
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} |
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|
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return $this->replace_http_with_https( $content ); |
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} |
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|
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/** |
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* Replace HTTP URLs with HTTPS |
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* |
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* @param string $content Content to process. |
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* @return string |
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*/ |
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private function replace_http_with_https( $content ) { |
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// Get site URL without protocol |
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$site_url = preg_replace( '/^https?:\/\//', '', home_url() ); |
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$site_url = preg_quote( $site_url, '/' ); |
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|
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// Replace HTTP with HTTPS for same domain |
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$patterns = array( |
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// Standard URLs |
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'/http:\/\/' . $site_url . '/i' => 'https://' . str_replace( '\\', '', $site_url ), |
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|
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// srcset attributes |
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'/http:\/\/(' . $site_url . '[^"\'\s]*)/i' => 'https://$1', |
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); |
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|
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foreach ( $patterns as $pattern => $replacement ) { |
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$content = preg_replace( $pattern, $replacement, $content ); |
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} |
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|
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// Fix protocol-relative URLs that should be HTTPS |
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$content = preg_replace( |
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'/(<(script|link|img|iframe|source|video|audio)[^>]*(?:src|href|srcset)=["\'])\/\//i', |
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'$1https://', |
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$content |
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); |
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|
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return $content; |
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} |
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|
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/** |
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* Fix URL scheme for enqueued scripts/styles |
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* |
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* @param string $url URL to fix. |
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* @return string |
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*/ |
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public function fix_url_scheme( $url ) { |
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if ( empty( $url ) || ! is_ssl() ) { |
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return $url; |
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} |
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|
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// Only fix URLs from the same domain |
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$site_host = wp_parse_url( home_url(), PHP_URL_HOST ); |
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$url_host = wp_parse_url( $url, PHP_URL_HOST ); |
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|
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if ( $site_host === $url_host ) { |
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$url = set_url_scheme( $url, 'https' ); |
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} |
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|
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return $url; |
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} |
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|
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/** |
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* Fix URLs in content |
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* |
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* @param string $content Content to process. |
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* @return string |
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*/ |
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public function fix_content_urls( $content ) { |
| 308 |
if ( empty( $content ) || ! is_ssl() ) { |
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return $content; |
| 310 |
} |
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|
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return $this->replace_http_with_https( $content ); |
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} |
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|
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/** |
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* Check if site is properly configured for HTTPS |
| 317 |
* |
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* @return array Status information. |
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*/ |
| 320 |
public function get_https_status() { |
| 321 |
$status = array( |
| 322 |
'ssl_available' => is_ssl(), |
| 323 |
'siteurl_https' => strpos( get_option( 'siteurl' ), 'https://' ) === 0, |
| 324 |
'home_https' => strpos( get_option( 'home' ), 'https://' ) === 0, |
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'force_ssl_admin' => defined( 'FORCE_SSL_ADMIN' ) && FORCE_SSL_ADMIN, |
| 326 |
'force_ssl_login' => defined( 'FORCE_SSL_LOGIN' ) && FORCE_SSL_LOGIN, |
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'certificate_valid' => $this->check_ssl_certificate(), |
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); |
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|
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$status['fully_configured'] = $status['ssl_available'] |
| 331 |
&& $status['siteurl_https'] |
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&& $status['home_https'] |
| 333 |
&& $status['certificate_valid']; |
| 334 |
|
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return $status; |
| 336 |
} |
| 337 |
|
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/** |
| 339 |
* Check if SSL certificate is valid |
| 340 |
* |
| 341 |
* @return bool |
| 342 |
*/ |
| 343 |
private function check_ssl_certificate() { |
| 344 |
$url = str_replace( 'http://', 'https://', home_url() ); |
| 345 |
|
| 346 |
$response = wp_remote_get( $url, array( |
| 347 |
'sslverify' => true, |
| 348 |
'timeout' => 10, |
| 349 |
)); |
| 350 |
|
| 351 |
return ! is_wp_error( $response ); |
| 352 |
} |
| 353 |
|
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/** |
| 355 |
* Get list of mixed content issues (for diagnostics) |
| 356 |
* |
| 357 |
* @return array |
| 358 |
*/ |
| 359 |
public function scan_for_mixed_content() { |
| 360 |
$issues = array(); |
| 361 |
|
| 362 |
// Check common options that might contain HTTP URLs |
| 363 |
$options_to_check = array( |
| 364 |
'siteurl', |
| 365 |
'home', |
| 366 |
'stylesheet_url', |
| 367 |
'template_url', |
| 368 |
); |
| 369 |
|
| 370 |
foreach ( $options_to_check as $option ) { |
| 371 |
$value = get_option( $option ); |
| 372 |
if ( $value && strpos( $value, 'http://' ) === 0 ) { |
| 373 |
$issues[] = array( |
| 374 |
'type' => 'option', |
| 375 |
'name' => $option, |
| 376 |
'value' => $value, |
| 377 |
); |
| 378 |
} |
| 379 |
} |
| 380 |
|
| 381 |
// Check for HTTP URLs in recent posts content |
| 382 |
global $wpdb; |
| 383 |
|
| 384 |
// phpcs:ignore WordPress.DB.DirectDatabaseQuery.DirectQuery,WordPress.DB.DirectDatabaseQuery.NoCaching |
| 385 |
$posts_with_http = $wpdb->get_results( |
| 386 |
"SELECT ID, post_title FROM {$wpdb->posts} |
| 387 |
WHERE post_status = 'publish' |
| 388 |
AND (post_content LIKE '%http://%' OR post_content LIKE '%src=\"http://%') |
| 389 |
LIMIT 10" |
| 390 |
); |
| 391 |
|
| 392 |
foreach ( $posts_with_http as $post ) { |
| 393 |
$issues[] = array( |
| 394 |
'type' => 'post', |
| 395 |
'id' => $post->ID, |
| 396 |
'title' => $post->post_title, |
| 397 |
); |
| 398 |
} |
| 399 |
|
| 400 |
return $issues; |
| 401 |
} |
| 402 |
} |
