388 lines
12 KiB
PHP
388 lines
12 KiB
PHP
<?php
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/*
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Plugin Name: Authorization Manager
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Plugin URI: https://github.com/nicwaller/yourls-authmgr-plugin
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Description: Restrict classes of users to specific functions
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Version: 0.9.2
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Author: nicwaller
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Author URI: https://github.com/nicwaller
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*/
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// No direct call
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if( !defined( 'YOURLS_ABSPATH' ) ) die();
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/****************** SET UP CONSTANTS ******************/
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/**
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* This plugin uses filter chains to evaluate whether specific actions
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* should be allowed to proceed. The filter names are defined here.
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*/
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define( 'AUTHMGR_ALLOW', 'filter_authmgr_allow' );
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define( 'AUTHMGR_HASROLE', 'filter_authmgr_hasrole' );
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// Define constants used for naming roles (but they don't work in config.php)
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class AuthmgrRoles {
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const Administrator = 'Administrator';
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const Editor = 'Editor';
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const Contributor = 'Contributor';
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}
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// Define constants used for naming capabilities
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class AuthmgrCapability {
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const ShowAdmin = 'ShowAdmin'; // only display admin panel
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const AddURL = 'AddURL';
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const DeleteURL = 'DeleteURL';
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const EditURL = 'EditURL';
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const ManagePlugins = 'ManagePlugins';
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const API = 'API';
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const ViewStats = 'ViewStats';
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}
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/********** Add hooks to intercept functionality in CORE ********/
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yourls_add_action( 'load_template_infos', 'authmgr_intercept_stats' );
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function authmgr_intercept_stats() {
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authmgr_require_capability( AuthmgrCapability::ViewStats );
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}
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yourls_add_action( 'api', 'authmgr_intercept_api' );
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function authmgr_intercept_api() {
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authmgr_require_capability( AuthmgrCapability::API );
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}
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yourls_add_action( 'auth_successful', 'authmgr_intercept_admin' );
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/**
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* YOURLS processes most actions in the admin page. It would be ideal
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* to add a unique hook for each action, but unfortunately we need to
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* hook the admin page load itself, and try to figure out what action
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* is intended.
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*
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* At this point, reasonably assume that the current request is for
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* a rendering of the admin page.
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*/
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function authmgr_intercept_admin() {
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authmgr_require_capability( AuthmgrCapability::ShowAdmin );
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// we use this GET param to send up a feedback notice to user
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if ( isset( $_GET['access'] ) && $_GET['access']=='denied' ) {
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yourls_add_notice('Access Denied');
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}
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$action_capability_map = array(
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'add' => AuthmgrCapability::AddURL,
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'delete' => AuthmgrCapability::DeleteURL,
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'edit_display' => AuthmgrCapability::EditURL,
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'edit_save' => AuthmgrCapability::EditURL,
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'activate' => AuthmgrCapability::ManagePlugins,
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'deactivate' => AuthmgrCapability::ManagePlugins,
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);
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// intercept requests for plugin management
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if ( isset( $_REQUEST['plugin'] ) ) {
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$action_keyword = $_REQUEST['action'];
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$cap_needed = $action_capability_map[$action_keyword];
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if ( $cap_needed !== NULL && authmgr_have_capability( $cap_needed ) !== true) {
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yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
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}
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}
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// Key actions like Add/Edit/Delete are AJAX requests
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if ( yourls_is_Ajax() ) {
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$action_keyword = $_REQUEST['action'];
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$cap_needed = $action_capability_map[$action_keyword];
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if ( authmgr_have_capability( $cap_needed ) !== true) {
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$err = array();
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$err['status'] = 'fail';
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$err['code'] = 'error:authorization';
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$err['message'] = 'Access Denied';
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$err['errorCode'] = '403';
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echo json_encode( $err );
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die();
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}
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}
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}
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yourls_add_filter( 'logout_link', 'authmgr_html_append_roles' );
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/**
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* This is a cosmetic filter that makes it possible to see which roles are
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* currently available, just by mousing over the username in the logout link.
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*/
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function authmgr_html_append_roles( $original ) {
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$authenticated = yourls_is_valid_user();
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if ( $authenticated === true ) {
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$listcaps = implode(', ', authmgr_enumerate_current_capabilities());
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return '<div title="'.$listcaps.'">'.$original.'</div>';
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} else {
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return $original;
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}
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}
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/**************** CAPABILITY TEST/ENUMERATION ****************/
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/*
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* If capability is not permitted in current context, then abort.
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* This is the most basic way to intercept unauthorized usage.
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*/
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function authmgr_require_capability( $capability ) {
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if ( !authmgr_have_capability( $capability ) ) {
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// If the user can't view admin interface, return a plain error.
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if ( !authmgr_have_capability( AuthmgrCapability::ShowAdmin ) ) {
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header("HTTP/1.0 403 Forbidden");
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die('Require permissions to show admin interface.');
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}
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// Otherwise, render errors in admin interface
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yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
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die();
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}
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}
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/*
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* Returns array of capabilities currently available.
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*/
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function authmgr_enumerate_current_capabilities() {
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$current_capabilities = array();
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$all_capabilities = authmgr_enumerate_all_capabilities();
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foreach ( $all_capabilities as $cap ) {
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if ( authmgr_have_capability( $cap ) ) {
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$current_capabilities[] = $cap;
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}
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}
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return $current_capabilities;
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}
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function authmgr_enumerate_all_capabilities() {
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return array(
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AuthmgrCapability::ShowAdmin,
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AuthmgrCapability::AddURL,
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AuthmgrCapability::DeleteURL,
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AuthmgrCapability::EditURL,
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AuthmgrCapability::ManagePlugins,
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AuthmgrCapability::API,
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AuthmgrCapability::ViewStats,
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);
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}
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/*
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* This is where everything comes together.
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*
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* Use the "allow" filter chain to see if the requested capability
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* is permitted in the current context. Any function in the filter
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* chain can change the response, but well-behaved functions will
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* only change 'false' to 'true', never the other way around.
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*/
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function authmgr_have_capability( $capability ) {
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return yourls_apply_filter( AUTHMGR_ALLOW, false, $capability);
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}
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/******************* FILTERS THAT GRANT CAPABILITIES *****************************/
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/* Whether an action is permitted is decided by running a filter chain. */
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/*********************************************************************************/
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/*
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* What capabilities are always available, including anonymous users?
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*/
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yourls_add_filter( AUTHMGR_ALLOW, 'authmgr_check_anon_capability', 5 );
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function authmgr_check_anon_capability( $original, $capability ) {
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global $authmgr_anon_capabilities;
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// Shortcut - trust approval given by earlier filters
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if ( $original === true ) return true;
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// Make sure the anon rights list has been setup
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authmgr_environment_check();
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// Check list of capabilities that don't require authentication
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return in_array( $capability, $authmgr_anon_capabilities );
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}
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/*
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* What capabilities are available through role assignments to the active user?
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*/
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yourls_add_filter( AUTHMGR_ALLOW, 'authmgr_check_user_capability', 10 );
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function authmgr_check_user_capability( $original, $capability ) {
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global $authmgr_role_capabilities;
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// Shortcut - trust approval given by earlier filters
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if ( $original === true ) return true;
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// ensure $authmgr_role_capabilities has been set up
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authmgr_environment_check();
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// If the user is not authenticated, then give up because only users have roles.
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$authenticated = yourls_is_valid_user();
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if ( $authenticated !== true )
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return false;
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// Enumerate the capabilities available to this user through roles
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$user_caps = array();
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foreach ( $authmgr_role_capabilities as $rolename => $rolecaps ) {
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if ( authmgr_user_has_role( YOURLS_USER, $rolename ) ) {
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$user_caps = array_merge( $user_caps, $rolecaps );
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}
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}
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$user_caps = array_unique( $user_caps );
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// Is the desired capability in the enumerated list of capabilities?
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return in_array( $capability, $user_caps );
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}
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/*
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* If the user is connecting from an IP address designated for admins,
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* then all capabilities are automatically granted.
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*
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* By default, only 127.0.0.0/8 (localhost) is an admin range.
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*/
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yourls_add_filter( AUTHMGR_ALLOW, 'authmgr_check_admin_ipranges', 15 );
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function authmgr_check_admin_ipranges( $original, $capability ) {
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global $authmgr_admin_ipranges;
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// Shortcut - trust approval given by earlier filters
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if ( $original === true ) return true;
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// ensure $authmgr_admin_ipranges is setup
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authmgr_environment_check();
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foreach ($authmgr_admin_ipranges as $range) {
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if ( authmgr_cidr_match( $_SERVER['REMOTE_ADDR'], $range ) )
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return true;
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}
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return $original; // effectively returns false
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}
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/*
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* What capabilities are available when making API requests without a username?
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*/
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yourls_add_filter( AUTHMGR_ALLOW, 'authmgr_check_apiuser_capability', 15 );
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function authmgr_check_apiuser_capability( $original, $capability ) {
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// Shortcut - trust approval given by earlier filters
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if ( $original === true ) return true;
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// In API mode and not using user/path authn? Let it go.
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if ( yourls_is_API() && !isset($_REQUEST['username']) )
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return true;
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return $original;
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}
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/******************** ROLE TEST AND ENUMERATION ***********************/
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/*
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* Determine whether a specific user has a role.
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*/
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function authmgr_user_has_role( $username, $rolename ) {
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return yourls_apply_filter( AUTHMGR_HASROLE, false, $username, $rolename );
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}
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// ******************* FILTERS THAT GRANT ROLE MEMBERSHIP *********************
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// By filtering AUTHMGR_HASROLE, you can connect internal roles to something else.
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// Any filter handlers should execute as quickly as possible.
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/*
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* What role memberships are defined for the user in user/config.php?
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*/
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yourls_add_filter( AUTHMGR_HASROLE, 'authmgr_user_has_role_in_config');
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function authmgr_user_has_role_in_config( $original, $username, $rolename ) {
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global $authmgr_role_assignment;
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// if no role assignments are created, grant everything
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// so the site still works even if stuff is configured wrong
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if ( empty( $authmgr_role_assignment ) )
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return true;
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// do this the case-insensitive way
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// the entire array was made lowercase in environment check
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$username = strtolower($username);
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$rolename = strtolower($rolename);
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// if the role doesn't exist, give up now.
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if ( !in_array( $rolename, array_keys( $authmgr_role_assignment ) ) )
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return false;
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$users_in_role = $authmgr_role_assignment[$rolename];
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return in_array( $username, $users_in_role );
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}
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/********************* VALIDATE CONFIGURATION ************************/
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function authmgr_environment_check() {
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global $authmgr_anon_capabilities;
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global $authmgr_role_capabilities;
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global $authmgr_role_assignment;
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if ( !isset( $authmgr_anon_capabilities) ) {
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$authmgr_anon_capabilities = array();
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}
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if ( !isset( $authmgr_role_capabilities) ) {
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$authmgr_role_capabilities = array(
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AuthmgrRoles::Administrator => array(
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AuthmgrCapability::ShowAdmin,
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AuthmgrCapability::AddURL,
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AuthmgrCapability::DeleteURL,
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AuthmgrCapability::EditURL,
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AuthmgrCapability::ManagePlugins,
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AuthmgrCapability::API,
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AuthmgrCapability::ViewStats,
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),
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AuthmgrRoles::Editor => array(
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AuthmgrCapability::ShowAdmin,
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AuthmgrCapability::AddURL,
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AuthmgrCapability::EditURL,
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AuthmgrCapability::DeleteURL,
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AuthmgrCapability::ViewStats,
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),
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AuthmgrRoles::Contributor => array(
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AuthmgrCapability::ShowAdmin,
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AuthmgrCapability::AddURL,
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AuthmgrCapability::ViewStats,
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),
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);
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}
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if ( !isset( $authmgr_role_assignment ) ) {
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$authmgr_role_assignment = array();
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}
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if ( !isset( $authmgr_iprange_roles ) ) {
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$authmgr_admin_ipranges = array(
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'127.0.0.0/8',
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);
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}
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// convert role assignment table to lower case if it hasn't been done already
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// this makes searches much easier!
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$authmgr_role_assignment_lower = array();
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foreach ( $authmgr_role_assignment as $key => $value ) {
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$t_key = strtolower( $key );
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$t_value = array_map('strtolower', $value);
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$authmgr_role_assignment_lower[$t_key] = $t_value;
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}
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$authmgr_role_assignment = $authmgr_role_assignment_lower;
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unset($authmgr_role_assignment_lower);
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return true;
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}
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// ***************** GENERAL UTILITY FUNCTIONS ********************
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/*
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* Borrowed from:
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* http://stackoverflow.com/questions/594112/matching-an-ip-to-a-cidr-mask-in-php5
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*/
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function authmgr_cidr_match($ip, $range)
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{
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list ($subnet, $bits) = split('/', $range);
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$ip = ip2long($ip);
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$subnet = ip2long($subnet);
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$mask = -1 << (32 - $bits);
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$subnet &= $mask; # nb: in case the supplied subnet wasn't correctly aligned
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return ($ip & $mask) == $subnet;
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}
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