Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 295 insertions, 0 deletions

diff --git a/wp-includes/class-wp-session-tokens.php b/wp-includes/class-wp-session-tokens.php
new file mode 100644
index 0000000..feabf69
--- /dev/null
+++ b/wp-includes/class-wp-session-tokens.php
@@ -0,0 +1,295 @@
+<?php
+/**
+ * Session API: WP_Session_Tokens class
+ *
+ * @package WordPress
+ * @subpackage Session
+ * @since 4.7.0
+ */
+
+/**
+ * Abstract class for managing user session tokens.
+ *
+ * @since 4.0.0
+ */
+#[AllowDynamicProperties]
+abstract class WP_Session_Tokens {
+
+	/**
+	 * User ID.
+	 *
+	 * @since 4.0.0
+	 * @var int User ID.
+	 */
+	protected $user_id;
+
+	/**
+	 * Protected constructor. Use the `get_instance()` method to get the instance.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param int $user_id User whose session to manage.
+	 */
+	protected function __construct( $user_id ) {
+		$this->user_id = $user_id;
+	}
+
+	/**
+	 * Retrieves a session manager instance for a user.
+	 *
+	 * This method contains a {@see 'session_token_manager'} filter, allowing a plugin to swap out
+	 * the session manager for a subclass of `WP_Session_Tokens`.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param int $user_id User whose session to manage.
+	 * @return WP_Session_Tokens The session object, which is by default an instance of
+	 *                           the `WP_User_Meta_Session_Tokens` class.
+	 */
+	final public static function get_instance( $user_id ) {
+		/**
+		 * Filters the class name for the session token manager.
+		 *
+		 * @since 4.0.0
+		 *
+		 * @param string $session Name of class to use as the manager.
+		 *                        Default 'WP_User_Meta_Session_Tokens'.
+		 */
+		$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
+		return new $manager( $user_id );
+	}
+
+	/**
+	 * Hashes the given session token for storage.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token Session token to hash.
+	 * @return string A hash of the session token (a verifier).
+	 */
+	private function hash_token( $token ) {
+		// If ext/hash is not present, use sha1() instead.
+		if ( function_exists( 'hash' ) ) {
+			return hash( 'sha256', $token );
+		} else {
+			return sha1( $token );
+		}
+	}
+
+	/**
+	 * Retrieves a user's session for the given token.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token Session token.
+	 * @return array|null The session, or null if it does not exist.
+	 */
+	final public function get( $token ) {
+		$verifier = $this->hash_token( $token );
+		return $this->get_session( $verifier );
+	}
+
+	/**
+	 * Validates the given session token for authenticity and validity.
+	 *
+	 * Checks that the given token is present and hasn't expired.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token Token to verify.
+	 * @return bool Whether the token is valid for the user.
+	 */
+	final public function verify( $token ) {
+		$verifier = $this->hash_token( $token );
+		return (bool) $this->get_session( $verifier );
+	}
+
+	/**
+	 * Generates a session token and attaches session information to it.
+	 *
+	 * A session token is a long, random string. It is used in a cookie
+	 * to link that cookie to an expiration time and to ensure the cookie
+	 * becomes invalidated when the user logs out.
+	 *
+	 * This function generates a token and stores it with the associated
+	 * expiration time (and potentially other session information via the
+	 * {@see 'attach_session_information'} filter).
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param int $expiration Session expiration timestamp.
+	 * @return string Session token.
+	 */
+	final public function create( $expiration ) {
+		/**
+		 * Filters the information attached to the newly created session.
+		 *
+		 * Can be used to attach further information to a session.
+		 *
+		 * @since 4.0.0
+		 *
+		 * @param array $session Array of extra data.
+		 * @param int   $user_id User ID.
+		 */
+		$session               = apply_filters( 'attach_session_information', array(), $this->user_id );
+		$session['expiration'] = $expiration;
+
+		// IP address.
+		if ( ! empty( $_SERVER['REMOTE_ADDR'] ) ) {
+			$session['ip'] = $_SERVER['REMOTE_ADDR'];
+		}
+
+		// User-agent.
+		if ( ! empty( $_SERVER['HTTP_USER_AGENT'] ) ) {
+			$session['ua'] = wp_unslash( $_SERVER['HTTP_USER_AGENT'] );
+		}
+
+		// Timestamp.
+		$session['login'] = time();
+
+		$token = wp_generate_password( 43, false, false );
+
+		$this->update( $token, $session );
+
+		return $token;
+	}
+
+	/**
+	 * Updates the data for the session with the given token.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token Session token to update.
+	 * @param array  $session Session information.
+	 */
+	final public function update( $token, $session ) {
+		$verifier = $this->hash_token( $token );
+		$this->update_session( $verifier, $session );
+	}
+
+	/**
+	 * Destroys the session with the given token.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token Session token to destroy.
+	 */
+	final public function destroy( $token ) {
+		$verifier = $this->hash_token( $token );
+		$this->update_session( $verifier, null );
+	}
+
+	/**
+	 * Destroys all sessions for this user except the one with the given token (presumably the one in use).
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $token_to_keep Session token to keep.
+	 */
+	final public function destroy_others( $token_to_keep ) {
+		$verifier = $this->hash_token( $token_to_keep );
+		$session  = $this->get_session( $verifier );
+		if ( $session ) {
+			$this->destroy_other_sessions( $verifier );
+		} else {
+			$this->destroy_all_sessions();
+		}
+	}
+
+	/**
+	 * Determines whether a session is still valid, based on its expiration timestamp.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param array $session Session to check.
+	 * @return bool Whether session is valid.
+	 */
+	final protected function is_still_valid( $session ) {
+		return $session['expiration'] >= time();
+	}
+
+	/**
+	 * Destroys all sessions for a user.
+	 *
+	 * @since 4.0.0
+	 */
+	final public function destroy_all() {
+		$this->destroy_all_sessions();
+	}
+
+	/**
+	 * Destroys all sessions for all users.
+	 *
+	 * @since 4.0.0
+	 */
+	final public static function destroy_all_for_all_users() {
+		/** This filter is documented in wp-includes/class-wp-session-tokens.php */
+		$manager = apply_filters( 'session_token_manager', 'WP_User_Meta_Session_Tokens' );
+		call_user_func( array( $manager, 'drop_sessions' ) );
+	}
+
+	/**
+	 * Retrieves all sessions for a user.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @return array Sessions for a user.
+	 */
+	final public function get_all() {
+		return array_values( $this->get_sessions() );
+	}
+
+	/**
+	 * Retrieves all sessions of the user.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @return array Sessions of the user.
+	 */
+	abstract protected function get_sessions();
+
+	/**
+	 * Retrieves a session based on its verifier (token hash).
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $verifier Verifier for the session to retrieve.
+	 * @return array|null The session, or null if it does not exist.
+	 */
+	abstract protected function get_session( $verifier );
+
+	/**
+	 * Updates a session based on its verifier (token hash).
+	 *
+	 * Omitting the second argument destroys the session.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $verifier Verifier for the session to update.
+	 * @param array  $session  Optional. Session. Omitting this argument destroys the session.
+	 */
+	abstract protected function update_session( $verifier, $session = null );
+
+	/**
+	 * Destroys all sessions for this user, except the single session with the given verifier.
+	 *
+	 * @since 4.0.0
+	 *
+	 * @param string $verifier Verifier of the session to keep.
+	 */
+	abstract protected function destroy_other_sessions( $verifier );
+
+	/**
+	 * Destroys all sessions for the user.
+	 *
+	 * @since 4.0.0
+	 */
+	abstract protected function destroy_all_sessions();
+
+	/**
+	 * Destroys all sessions for all users.
+	 *
+	 * @since 4.0.0
+	 */
+	public static function drop_sessions() {}
+}