127 lines
3.3 KiB
PHP
127 lines
3.3 KiB
PHP
<?php
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/*
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Plugin Name: Simple LDAP Auth
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Plugin URI:
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Description: This plugin enables use of LDAP provider for authentication
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Version: 1.0
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Author: k3a
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Author URI: http://k3a.me
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*/
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// Thanks to nicwaller (https://github.com/nicwaller) for cas plugin I used as a reference!
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// No direct call
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if( !defined( 'YOURLS_ABSPATH' ) ) die();
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// returns true if the environment is set up right
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function ldap_environment_check() {
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$required_params = array(
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'LDAP_HOST', // ldap host
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//'LDAP_PORT', // ldap port
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'LDAP_BASE', // base ldap path
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//'LDAP_USERNAME_FIELD', // field to check the username against
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);
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foreach ($required_params as $pname) {
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if ( !defined( $pname ) ) {
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$message = 'Missing defined parameter '.$pname.' in plugin '. $thisplugname;
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error_log($message);
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return false;
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}
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}
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if ( !defined( 'LDAP_PORT' ) )
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define( 'LDAP_PORT', 389 );
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if ( !defined( 'LDAP_USERNAME_FIELD' ) )
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define( 'LDAP_USERNAME_FIELD', 'uid' );
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if ( !defined( 'LDAP_ALL_USERS_ADMIN' ) )
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define( 'LDAP_ALL_USERS_ADMIN', true );
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global $ldap_authorized_admins;
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if ( !isset( $ldap_authorized_admins ) ) {
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if ( !LDAP_ALL_USERS_ADMIN ) {
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error_log('Undefined $ldap_authorized_admins');
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}
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$ldap_authorized_admins = array();
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}
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return true;
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}
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yourls_add_filter( 'is_valid_user', 'ldap_is_valid_user' );
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// returns true/false
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function ldap_is_valid_user( $value ) {
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// doesn't work for API...
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if (yourls_is_API())
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return $value;
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@session_start();
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if ( isset( $_SESSION['LDAP_AUTH_USER'] ) ) {
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// already authenticated...
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$username = $_SESSION['LDAP_AUTH_USER'];
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if ( ldap_is_authorized_user( $username ) ) {
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yourls_set_user( $_SESSION['LDAP_AUTH_USER'] );
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return true;
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} else {
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return $username.' is not admin user.';
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}
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} else if ( isset( $_REQUEST['username'] ) && isset( $_REQUEST['password'] )
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&& !empty( $_REQUEST['username'] ) && !empty( $_REQUEST['password'] ) ) {
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if ( !ldap_environment_check() ) {
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die( 'Invalid configuration for YOURLS LDAP plugin. Check PHP error log.' );
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}
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// try to authenticate
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$ldapConnection = ldap_connect(LDAP_HOST, LDAP_PORT);
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if (!$ldapConnection) Die("Cannot connect to LDAP " . LDAP_HOST);
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$searchDn = ldap_search($ldapConnection, LDAP_BASE, LDAP_USERNAME_FIELD . "=" . $_REQUEST['username'] );
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if (!$searchDn) return $value;
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$searchResult = ldap_get_entries($ldapConnection, $searchDn);
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if (!$searchResult) return $value;
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$userDn = $searchResult[0]['dn'];
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if (!$userDn) return $value;
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$ldap_login = @ldap_bind($ldapConnection, $userDn, $_REQUEST['password']);
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@ldap_close($ldapConnection);
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// success?
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if ($ldap_login)
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{
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$username = $searchResult[0][LDAP_USERNAME_FIELD][0];
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yourls_set_user($username);
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$_SESSION['LDAP_AUTH_USER'] = $username;
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return true;
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}
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}
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return $value;
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}
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function ldap_is_authorized_user( $username ) {
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// by default, anybody who can authenticate is also
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// authorized as an administrator.
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if ( LDAP_ALL_USERS_ADMIN ) {
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return true;
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}
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// users listed in config.php are admin users. let them in.
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global $ldap_authorized_admins;
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if ( in_array( $username, $ldap_authorized_admins ) ) {
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return true;
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}
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// not an admin user
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return false;
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}
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yourls_add_action( 'logout', 'ldap_logout_hook' );
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function ldap_logout_hook( $args ) {
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unset($_SESSION['LDAP_AUTH_USER']);
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setcookie('PHPSESSID', '', 0, '/');
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}
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