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PHP 8.1.34
Preview: ServiceWorkerReporter.php Size: 9.23 KB
/home2/astrociv/public_html/gotransit.in/wp-content/plugins/imunify-security/inc/App/Defender/ServiceWorkerReporter.php
<?php
/**
 * Copyright (с) Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2025 All Rights Reserved
 *
 * Licensed under CLOUD LINUX LICENSE AGREEMENT
 * https://www.cloudlinux.com/legal/
 */

namespace CloudLinux\Imunify\App\Defender;

/**
 * Receives browser-side service worker findings from an administrator's browser.
 *
 * The endpoint deliberately accepts nothing that identifies an incident. The
 * rule, the mode and the message are all decided here, so a caller cannot use
 * it to record an arbitrary incident — only one of the three service worker
 * events below, about a worker on this site's own origin.
 *
 * @since 4.1.2
 */
class ServiceWorkerReporter {

	const AJAX_ACTION = 'imunify_sw_report';
	const NONCE_NAME  = 'imunify_sw_report_nonce';
	const CAPABILITY  = 'manage_options';

	const MAX_EVENTS_PER_REQUEST = 20;
	const MAX_URL_LENGTH         = 2048;
	const MAX_REQUEST_BYTES      = 65536;

	/**
	 * Events the endpoint will accept. Anything else is rejected.
	 *
	 * @var array
	 */
	private static $allowedEvents = array( 'unregistered', 'detected', 'recurrence' );

	/**
	 * Incident recorder instance.
	 *
	 * @var IncidentRecorder
	 */
	private $incidentRecorder;

	/**
	 * Payloads the site is running.
	 *
	 * @var ServiceWorkerPayloads
	 */
	private $payloads;

	/**
	 * Ruleset version.
	 *
	 * @var string
	 */
	private $rulesetVersion;

	/**
	 * Constructor.
	 *
	 * @param IncidentRecorder      $incidentRecorder Incident recorder instance.
	 * @param ServiceWorkerPayloads $payloads         Payloads the site is running.
	 * @param string                $rulesetVersion   Ruleset version.
	 */
	public function __construct( $incidentRecorder, ServiceWorkerPayloads $payloads, $rulesetVersion = '' ) {
		$this->incidentRecorder = $incidentRecorder;
		$this->payloads         = $payloads;
		$this->rulesetVersion   = $rulesetVersion;
	}

	/**
	 * Register the AJAX action.
	 *
	 * Registered without a nopriv twin, so logged-out visitors cannot reach it.
	 *
	 * @return void
	 */
	public function registerHooks() {
		add_action( 'wp_ajax_' . self::AJAX_ACTION, array( $this, 'handleReport' ) );
	}

	/**
	 * Whether the current user may send reports.
	 *
	 * @return bool
	 */
	public static function currentUserMayReport() {
		return is_user_logged_in() && current_user_can( self::CAPABILITY );
	}

	/**
	 * Handle a batch of service worker findings.
	 *
	 * @return void
	 */
	public function handleReport() {
		if ( ! self::currentUserMayReport() ) {
			wp_send_json_error( array( 'reason' => 'forbidden' ), 403 );
		}

		$nonce = isset( $_POST['nonce'] ) ? sanitize_text_field( wp_unslash( $_POST['nonce'] ) ) : '';
		if ( ! wp_verify_nonce( $nonce, self::NONCE_NAME ) ) {
			wp_send_json_error( array( 'reason' => 'bad_nonce' ), 403 );
		}

		if ( empty( $this->payloads->all() ) ) {
			wp_send_json_error( array( 'reason' => 'disabled' ), 403 );
		}

		// phpcs:ignore WordPress.Security.ValidatedSanitizedInput.InputNotSanitized -- a JSON document, decoded below and validated field by field in normaliseEvent(); sanitize_text_field() would corrupt it.
		$raw = isset( $_POST['events'] ) ? wp_unslash( $_POST['events'] ) : '';
		if ( ! is_string( $raw ) || '' === $raw ) {
			wp_send_json_error( array( 'reason' => 'no_events' ), 400 );
		}

		if ( strlen( $raw ) > self::MAX_REQUEST_BYTES ) {
			wp_send_json_error( array( 'reason' => 'too_large' ), 413 );
		}

		$events = json_decode( $raw, true );
		if ( ! is_array( $events ) ) {
			wp_send_json_error( array( 'reason' => 'bad_events' ), 400 );
		}

		$events    = array_slice( $events, 0, self::MAX_EVENTS_PER_REQUEST );
		$request   = new Request();
		$accepted  = 0;
		$rejected  = 0;
		$throttled = array();

		foreach ( $events as $index => $event ) {
			$normalised = $this->normaliseEvent( $event );
			if ( null === $normalised ) {

				// Malformed, and it will be malformed next time too. Refusing it
				// again on every page load is worse than losing it once.
				$rejected++;
				continue;
			}

			$payload = $normalised['payload'];

			// Loading drops a rule whose target is absent, so a collected
			// payload always has one. Filing the incident against a guess
			// rather than against the rule is worse than losing it.
			$targetInfo = $this->payloads->targetInfoFor( $payload['id'] );
			if ( null === $targetInfo ) {
				$rejected++;
				continue;
			}

			$recorded = $this->incidentRecorder->recordServiceWorkerIncident(
				$payload['rule_id'],
				$this->cveForEvent( $payload, $normalised['event'] ),
				$this->deployedMode( $payload ),
				$normalised['event'],
				$normalised['details'],
				$request,
				$targetInfo,
				$this->rulesetVersion
			);

			if ( $recorded ) {
				$accepted++;
			} else {

				// Well-formed but not stored -- the rate limiter, most often. The
				// browser is told which ones, so a finding is not dropped on an
				// acknowledgement that recorded nothing.
				$rejected++;
				$throttled[] = (int) $index;
			}
		}

		wp_send_json_success(
			array(
				'accepted'  => $accepted,
				'rejected'  => $rejected,
				'throttled' => $throttled,
			)
		);
	}

	/**
	 * Validate one submitted event.
	 *
	 * Returns null when the event is not something this endpoint accepts.
	 *
	 * @param mixed $event Raw event from the browser.
	 *
	 * @return array|null
	 */
	private function normaliseEvent( $event ) {
		if ( ! is_array( $event ) ) {
			return null;
		}

		$name = self::stringField( $event, 'event' );
		if ( ! in_array( $name, self::$allowedEvents, true ) ) {
			return null;
		}

		$scope     = self::stringField( $event, 'scope' );
		$scriptUrl = self::stringField( $event, 'scriptURL' );

		if ( ! $this->isOwnOrigin( $scope ) || ! $this->isOwnOrigin( $scriptUrl ) ) {
			return null;
		}

		$context = self::stringField( $event, 'context' );
		if ( ! in_array( $context, array( 'admin', 'login', 'frontend' ), true ) ) {
			return null;
		}

		// The browser names a payload, and that name is only ever a key into the
		// map of payloads this site is actually running. Nothing the caller sends
		// reaches an incident except through the entry this lookup returns.
		$payload = $this->payloads->find( self::stringField( $event, 'payload_id' ) );
		if ( null === $payload ) {
			return null;
		}

		return array(
			'event'   => $name,
			'payload' => $payload,
			'details' => array(
				'scope'           => $this->trim( $scope ),
				'script_url'      => $this->trim( $scriptUrl ),
				'context'         => $context,
				'recurrences'     => isset( $event['recurrences'] ) ? min( 9999, absint( $event['recurrences'] ) ) : 0,
				'payload_id'      => $payload['id'],
				'payload_version' => $payload['version'],
				'payload_mode'    => $payload['mode'],
			),
		);
	}

	/**
	 * Read one field of a submitted event as a string.
	 *
	 * JSON can put an array or an object where a string is expected, and casting
	 * one to a string is a PHP warning before it is a rejected value.
	 *
	 * @param array  $event Raw event from the browser.
	 * @param string $key   Field to read.
	 *
	 * @return string Empty string when the field is absent or not a scalar.
	 */
	private static function stringField( array $event, $key ) {
		if ( ! isset( $event[ $key ] ) || ! is_scalar( $event[ $key ] ) ) {
			return '';
		}

		return (string) $event[ $key ];
	}

	/**
	 * Whether a URL belongs to this site's own origin.
	 *
	 * Service worker registries are per origin, so a report about any other
	 * origin cannot have come from this site's script.
	 *
	 * @param string $url URL to check.
	 *
	 * @return bool
	 */
	private function isOwnOrigin( $url ) {
		if ( '' === $url || strlen( $url ) > self::MAX_URL_LENGTH ) {
			return false;
		}

		$parts = wp_parse_url( $url );
		$home  = wp_parse_url( home_url( '/' ) );

		if ( empty( $parts['host'] ) || empty( $home['host'] ) ) {
			return false;
		}

		if ( strtolower( $parts['host'] ) !== strtolower( $home['host'] ) ) {
			return false;
		}

		// A registry is keyed on the whole origin, so a different port is a
		// different registry and cannot be what this site's script looked at.
		$port     = isset( $parts['port'] ) ? (int) $parts['port'] : 443;
		$homePort = isset( $home['port'] ) ? (int) $home['port'] : 443;
		if ( $port !== $homePort ) {
			return false;
		}

		$scheme = isset( $parts['scheme'] ) ? strtolower( $parts['scheme'] ) : '';

		return 'https' === $scheme;
	}

	/**
	 * Clamp a string to the maximum stored length.
	 *
	 * @param string $value Value to clamp.
	 *
	 * @return string
	 */
	private function trim( $value ) {
		return substr( $value, 0, self::MAX_URL_LENGTH );
	}

	/**
	 * Per-event identifier recorded in the CVE position.
	 *
	 * The agent drops fields it does not know, and aggregates rows on a key
	 * built from this value, so the event has to be part of it or a removal
	 * and a recurrence merge into one row.
	 *
	 * @param array  $payload Payload the event was resolved to.
	 * @param string $event   Validated event name.
	 *
	 * @return string
	 */
	private function cveForEvent( array $payload, $event ) {
		return $payload['cve'] . '-' . strtoupper( $event );
	}

	/**
	 * Deployed rule mode, taken from the rule rather than from the browser.
	 *
	 * @param array $payload Payload the event was resolved to.
	 *
	 * @return string
	 */
	private function deployedMode( array $payload ) {
		return 'enforce' === $payload['mode'] ? Model\RuleMode::BLOCK : Model\RuleMode::PASS;
	}
}

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