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Description

Ensures intent by verifying that a user was referred from another admin page with the correct security nonce.

This function ensures the user intends to perform a given action, which helps protect against clickjacking style attacks. It verifies intent, not authorisation, therefore it does not verify the user's capabilities. This should be performed with current_user_can() or similar. If the nonce value is invalid, the function will exit with an "Are You Sure?" style message.

Usage

$false|int = check_admin_referer( $action, $query_arg );

Parameters

$action

( int|string ) optional default: -1 – The nonce action.

$query_arg

( string ) optional default: _wpnonce – Optional. Key to check for nonce in `$_REQUEST`. Default '_wpnonce'.

Returns

false|int False if the nonce is invalid, 1 if the nonce is valid and generated between

1. -12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.

Source

File name: wordpress/wp-includes/pluggable.php


Lines:
1 to 29 of 29
  function check_admin_referer( $action = -1, $query_arg = '_wpnonce' ) {
    if ( -1 === $action ) {
      _doing_it_wrong( check_admin_referer, __( 'You should specify a nonce action to be verified by using the first parameter.' ), '3.2.0' );
    }

    $adminurl = strtolower( admin_url() );
    $referer  = strtolower( wp_get_referer() );
    $result   = isset( $_REQUEST[ $query_arg ] ) ? wp_verify_nonce( $_REQUEST[ $query_arg ], $action ) : false;

    
/**
 * Fires once the admin request has been validated or not.
 *
 * @since 1.5.1
 *
 * @param string    $action The nonce action.
 * @param false|int $result False if the nonce is invalid, 1 if the nonce is valid and generated between
 *                          0-12 hours ago, 2 if the nonce is valid and generated between 12-24 hours ago.
 */
    do_action( 'check_admin_referer', $action, $result );

    if ( ! $result && ! ( -1 === $action && strpos( $referer, $adminurl ) === 0 ) ) {
      wp_nonce_ays( $action );
      die();
    }

    return $result;
  }
 

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