← All changes | src/component/class-firewall.php +40 -5 6.2.3 → 6.3.0 View file →

		@@ -14,9 +14,9 @@
14	14	use WP_Defender\Model\Lockout_Ip;
15	15	use WP_Defender\Behavior\WPMUDEV;
16	16	use WP_Defender\Model\Lockout_Log;
17	17	use WP_Defender\Model\Onboard;
18		-use MaxMind\Db\Reader\InvalidDatabaseException;
	18	+use WP_DEFENDER_VENDOR\MaxMind\Db\Reader\InvalidDatabaseException;
19	19	use WP_Defender\Model\Setting\Firewall as Model_Firewall;
20	20	use WP_Defender\Component\Trusted_Proxy_Preset\Cloudflare_Proxy;
21	21	use WP_Defender\Component\Trusted_Proxy_Preset\Trusted_Proxy_Preset;
22	22	use WP_Defender\Controller\Firewall as Firewall_Controller;
		@@ -69,12 +69,44 @@
69	69
70	70	/**
71	71	* Check is the access from authenticated staff.
72	72	*
73		- * @return bool
	73	+ * Validates the `wpmudev_is_staff` cookie token by verifying:
	74	+ * - Token version and structure (v1.<payload>.<signature>)
	75	+ * - HMAC-SHA256 signature against site salt (`wpmudev_remote_access`)
	76	+ * - Token expiration timestamp against current time
	77	+ * - Audience (`aud`) against current site URL (`home_url('/')`)
	78	+ * - Subject (`sub`) against currently authenticated user ID
	79	+ *
	80	+ * @return bool True if staff access token is valid and unexpired, false otherwise.
74	81	*/
75	82	private function is_authenticated_staff_access(): bool {
76		- return '1' === defender_get_data_from_request( 'wpmudev_is_staff', 'c' );
	83	+ $cookie = defender_get_data_from_request( 'wpmudev_is_staff', 'c' );
	84	+ if ( ! is_string( $cookie ) ) {
	85	+ return false;
	86	+ }
	87	+
	88	+ $token = explode( '.', $cookie, 3 );
	89	+ if ( 3 !== count( $token ) || 'v1' !== $token[0] ) {
	90	+ return false;
	91	+ }
	92	+
	93	+ $signature = hash_hmac( 'sha256', $token[1], wp_salt( 'wpmudev_remote_access' ) );
	94	+ if ( ! hash_equals( $signature, $token[2] ) ) {
	95	+ return false;
	96	+ }
	97	+ // Improve flow to avoid bypassing staff access authentication via an unsigned cookie. Use legitim payload.
	98	+ $payload = base64_decode( strtr( $token[1], '-_', '+/' ) . str_repeat( '=', ( 4 - strlen( $token[1] ) % 4 ) % 4 ), true );// phpcs:ignore WordPress.PHP.DiscouragedPHPFunctions.obfuscation_base64_decode
	99	+ $payload = is_string( $payload ) ? json_decode( $payload, true ) : null;
	100	+
	101	+ return is_array( $payload ) &&
	102	+ isset( $payload['aud'], $payload['exp'], $payload['sub'] ) &&
	103	+ is_string( $payload['aud'] ) &&
	104	+ is_numeric( $payload['exp'] ) &&
	105	+ is_numeric( $payload['sub'] ) &&
	106	+ (int) $payload['exp'] > time() &&
	107	+ hash_equals( home_url( '/' ), $payload['aud'] ) &&
	108	+ get_current_user_id() === (int) $payload['sub'];
77	109	}
78	110
79	111	/**
80	112	* Check if the access is from our staff access.
		@@ -96,10 +128,13 @@
96	128	$is_remote_access = is_object( WPMUDEV_Dashboard::$api ) &&
97	129	true === WPMUDEV_Dashboard::$api->remote_access_details( 'enabled' );
98	130
99	131	if ( $is_remote_access ) {
100		- $access = $wpmu_dev->get_remote_access();
101		- if ( $this->is_authenticated_staff_access() || $this->is_commencing_staff_access( $access ) ) {
	132	+ $access = $wpmu_dev->get_remote_access();
	133	+ $is_authenticated_staff_access = isset( $access['userid'] ) &&
	134	+ get_current_user_id() === (int) $access['userid'] &&
	135	+ $this->is_authenticated_staff_access();
	136	+ if ( $is_authenticated_staff_access || $this->is_commencing_staff_access( $access ) ) {
102	137	$this->log( $access, Firewall_Controller::FIREWALL_LOG );
103	138
104	139	return true;
105	140	}