WordPress Version: 6.1
/**
* Validates authentication cookie.
*
* The checks include making sure that the authentication cookie is set and
* pulling in the contents (if $cookie is not used).
*
* Makes sure the cookie is not expired. Verifies the hash in cookie is what is
* should be and compares the two.
*
* @since 2.5.0
*
* @global int $login_grace_period
*
* @param string $cookie Optional. If used, will validate contents instead of cookie's.
* @param string $scheme Optional. The cookie scheme to use: 'auth', 'secure_auth', or 'logged_in'.
* @return int|false User ID if valid cookie, false if invalid.
*/
function wp_validate_auth_cookie($cookie = '', $scheme = '')
{
$cookie_elements = wp_parse_auth_cookie($cookie, $scheme);
if (!$cookie_elements) {
/**
* Fires if an authentication cookie is malformed.
*
* @since 2.7.0
*
* @param string $cookie Malformed auth cookie.
* @param string $scheme Authentication scheme. Values include 'auth', 'secure_auth',
* or 'logged_in'.
*/
do_action('auth_cookie_malformed', $cookie, $scheme);
return false;
}
$scheme = $cookie_elements['scheme'];
$username = $cookie_elements['username'];
$hmac = $cookie_elements['hmac'];
$token = $cookie_elements['token'];
$expired = $cookie_elements['expiration'];
$expiration = $cookie_elements['expiration'];
// Allow a grace period for POST and Ajax requests.
if (wp_doing_ajax() || 'POST' === $_SERVER['REQUEST_METHOD']) {
$expired += HOUR_IN_SECONDS;
}
// Quick check to see if an honest cookie has expired.
if ($expired < time()) {
/**
* Fires once an authentication cookie has expired.
*
* @since 2.7.0
*
* @param string[] $cookie_elements {
* Authentication cookie components. None of the components should be assumed
* to be valid as they come directly from a client-provided cookie value.
*
* @type string $username User's username.
* @type string $expiration The time the cookie expires as a UNIX timestamp.
* @type string $token User's session token used.
* @type string $hmac The security hash for the cookie.
* @type string $scheme The cookie scheme to use.
* }
*/
do_action('auth_cookie_expired', $cookie_elements);
return false;
}
$user = get_user_by('login', $username);
if (!$user) {
/**
* Fires if a bad username is entered in the user authentication process.
*
* @since 2.7.0
*
* @param string[] $cookie_elements {
* Authentication cookie components. None of the components should be assumed
* to be valid as they come directly from a client-provided cookie value.
*
* @type string $username User's username.
* @type string $expiration The time the cookie expires as a UNIX timestamp.
* @type string $token User's session token used.
* @type string $hmac The security hash for the cookie.
* @type string $scheme The cookie scheme to use.
* }
*/
do_action('auth_cookie_bad_username', $cookie_elements);
return false;
}
$pass_frag = substr($user->user_pass, 8, 4);
$key = wp_hash($username . '|' . $pass_frag . '|' . $expiration . '|' . $token, $scheme);
// If ext/hash is not present, compat.php's hash_hmac() does not support sha256.
$algo = function_exists('hash') ? 'sha256' : 'sha1';
$hash = hash_hmac($algo, $username . '|' . $expiration . '|' . $token, $key);
if (!hash_equals($hash, $hmac)) {
/**
* Fires if a bad authentication cookie hash is encountered.
*
* @since 2.7.0
*
* @param string[] $cookie_elements {
* Authentication cookie components. None of the components should be assumed
* to be valid as they come directly from a client-provided cookie value.
*
* @type string $username User's username.
* @type string $expiration The time the cookie expires as a UNIX timestamp.
* @type string $token User's session token used.
* @type string $hmac The security hash for the cookie.
* @type string $scheme The cookie scheme to use.
* }
*/
do_action('auth_cookie_bad_hash', $cookie_elements);
return false;
}
$manager = WP_Session_Tokens::get_instance($user->ID);
if (!$manager->verify($token)) {
/**
* Fires if a bad session token is encountered.
*
* @since 4.0.0
*
* @param string[] $cookie_elements {
* Authentication cookie components. None of the components should be assumed
* to be valid as they come directly from a client-provided cookie value.
*
* @type string $username User's username.
* @type string $expiration The time the cookie expires as a UNIX timestamp.
* @type string $token User's session token used.
* @type string $hmac The security hash for the cookie.
* @type string $scheme The cookie scheme to use.
* }
*/
do_action('auth_cookie_bad_session_token', $cookie_elements);
return false;
}
// Ajax/POST grace period set above.
if ($expiration < time()) {
$GLOBALS['login_grace_period'] = 1;
}
/**
* Fires once an authentication cookie has been validated.
*
* @since 2.7.0
*
* @param string[] $cookie_elements {
* Authentication cookie components.
*
* @type string $username User's username.
* @type string $expiration The time the cookie expires as a UNIX timestamp.
* @type string $token User's session token used.
* @type string $hmac The security hash for the cookie.
* @type string $scheme The cookie scheme to use.
* }
* @param WP_User $user User object.
*/
do_action('auth_cookie_valid', $cookie_elements, $user);
return $user->ID;
}