YOURLS-AuthMgrPlus/authMgrPlus/plugin.php

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<?php
/*
Plugin Name: Auth Manager Plus
Plugin URI: https://github.com/joshp23/YOURLS-AuthMgrPlus
Description: Role Based Access Controlls with seperated user data for authenticated users
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Version: 2.2.2
Author: Josh Panter, nicwaller, Ian Barber <ian.barber@gmail.com>
Author URI: https://unfettered.net
*/
// No direct call
if( !defined( 'YOURLS_ABSPATH' ) ) die();
/****************** SET UP CONSTANTS ******************/
class ampRoles {
const Administrator = 'Administrator';
const Editor = 'Editor';
const Contributor = 'Contributor';
}
class ampCap {
const ShowAdmin = 'ShowAdmin';
const AddURL = 'AddURL';
const DeleteURL = 'DeleteURL';
const EditURL = 'EditURL';
const Traceless = 'Traceless';
const ManageAnonURL = 'ManageAnonURL';
const ManageUsrsURL = 'ManageUsrsURL';
const ManagePlugins = 'ManagePlugins';
const API = 'API';
const APIu = 'APIu';
const ViewStats = 'ViewStats';
const ViewAll = 'ViewAll';
}
/********** Add hooks to intercept functionality in CORE **********/
yourls_add_action( 'load_template_infos', 'amp_intercept_stats' );
function amp_intercept_stats() {
if ( 'YOURLS_PRIVATE_INFOS' === true ) {
amp_require_capability( ampCap::ViewStats );
}
}
yourls_add_action( 'api', 'amp_intercept_api' );
function amp_intercept_api() {
if ( 'YOURLS_PRIVATE_API' === true ) {
if ( isset( $_REQUEST['shorturl'] ) || isset( $_REQUEST['stats'] ) ) {
amp_require_capability( ampCap::APIu );
} else {
amp_require_capability( ampCap::API );
}
}
}
yourls_add_action( 'auth_successful', function() {
if( yourls_is_admin() ) amp_intercept_admin();
} );
/**
* YOURLS processes most actions in the admin page. It would be ideal
* to add a unique hook for each action, but unfortunately we need to
* hook the admin page load itself, and try to figure out what action
* is intended.
*
* TODO: look for these hooks
*
* At this point, reasonably assume that the current request is for
* a rendering of the admin page.
*/
function amp_intercept_admin() {
amp_require_capability( ampCap::ShowAdmin );
// we use this GET param to send up a feedback notice to user
if ( isset( $_GET['access'] ) && $_GET['access']=='denied' ) {
yourls_add_notice('Access Denied');
}
$action_capability_map = array(
'add' => ampCap::AddURL,
'delete' => ampCap::DeleteURL,
'edit_display' => ampCap::EditURL,
'edit_save' => ampCap::EditURL,
'activate' => ampCap::ManagePlugins,
'deactivate' => ampCap::ManagePlugins,
);
// allow manipulation of this list ( be mindfull of extending Authmp Capability class if needed )
yourls_apply_filter( 'amp_action_capability_map', $action_capability_map);
// Key actions like Add/Edit/Delete are AJAX requests
if ( yourls_is_Ajax() ) {
// Define some boundaries for ownership
$restricted_actions = array( 'edit_display',
'edit_save',
'delete'
);
// Allow some flexability with those boundaries
yourls_apply_filter( 'amp_restricted_ajax_actions', $restricted_actions );
$action_keyword = $_REQUEST['action'];
// Check the action against those boundaries
if ( in_array( $action_keyword, $restricted_actions) ) {
$keyword = $_REQUEST['keyword'];
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$do = amp_manage_keyword( $keyword, $action_capability_map[$action_keyword] );
} else {
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$do = amp_have_capability( $action_capability_map[$action_keyword] );
}
if ( $do !== true ) {
$err = array();
$err['status'] = 'fail';
$err['code'] = 'error:authorization';
$err['message'] = 'Access Denied';
$err['errorCode'] = '403';
echo json_encode( $err );
die();
}
}
// Intercept requests for plugin management
if( isset( $_SERVER['REQUEST_URI'] ) && preg_match('/\/admin\/plugins\.php.*/', $_SERVER['REQUEST_URI'] ) ) {
// Is this a plugin page request?
if ( isset( $_REQUEST['page'] ) ) {
// Is this an allowed plugin?
global $amp_allowed_plugin_pages;
if ( amp_have_capability( ampCap::ManagePlugins ) !== true) {
$r = $_REQUEST['page'];
if(!in_array($r, $amp_allowed_plugin_pages ) ) {
yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
}
}
} else {
// Should this user touch plugins?
if ( amp_have_capability( ampCap::ManagePlugins ) !== true) {
yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
}
}
// intercept requests for global plugin management actions
if (isset( $_REQUEST['plugin'] ) ) {
$action_keyword = $_REQUEST['action'];
$cap_needed = $action_capability_map[$action_keyword];
if ( $cap_needed !== NULL && amp_have_capability( $cap_needed ) !== true) {
yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
}
}
}
}
/*
* Cosmetic filter: removes disallowed plugins from link list
*/
yourls_add_filter( 'admin_sublinks', 'amp_admin_sublinks' );
function amp_admin_sublinks( $links ) {
global $amp_allowed_plugin_pages;
if ( amp_have_capability( ampCap::ManagePlugins ) !== true) {
foreach( $links['plugins'] as $link => $ar ) {
if(!in_array($link, $amp_allowed_plugin_pages) )
unset($links['plugins'][$link]);
}
}
if( empty( $links['plugins'] ) )
yourls_add_filter( 'admin_links', 'amp_admin_links' );
sort($links['plugins']);
return $links;
}
function amp_admin_links( $links ) {
unset($links['plugins']);
return $links;
}
/*
* Cosmetic filter: displays currently available roles
* by hovering mouse over the username in logout link.
*/
yourls_add_filter( 'logout_link', 'amp_html_append_roles' );
function amp_html_append_roles( $original ) {
if ( amp_is_valid_user() ) {
$listcaps = implode(', ', amp_current_capabilities());
return '<div title="'.$listcaps.'">'.$original.'</div>';
} else {
return $original;
}
}
/**************** CAPABILITY TESTING ****************/
/*
* If capability is not permitted in current context, then abort.
* This is the most basic way to intercept unauthorized usage.
*/
// TODO: API responses!
function amp_require_capability( $capability ) {
if ( !amp_have_capability( $capability ) ) {
// If the user can't view admin interface, return a plain error.
if ( !amp_have_capability( ampCap::ShowAdmin ) ) {
// header("HTTP/1.0 403 Forbidden");
die('Require permissions to show admin interface.');
}
// Otherwise, render errors in admin interface
yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
die();
}
}
// Heart of system - Can the user do "X"?
function amp_have_capability( $capability ) {
global $amp_anon_capabilities;
global $amp_role_capabilities;
global $amp_admin_ipranges;
global $amp_default_role;
// Make sure the environment has been setup
amp_env_check();
// Check anon capabilities
$return = in_array( $capability, $amp_anon_capabilities );
// Check user-role based auth
if( !$return ) {
// Only users have roles
if ( !amp_is_valid_user() ) //XXX
return false;
// List capabilities of particular user role
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$user = YOURLS_USER !== false ? YOURLS_USER : NULL;
$user_caps = array();
foreach ( $amp_role_capabilities as $rolename => $rolecaps ) {
if ( amp_user_has_role( $user, $rolename ) ) {
$user_caps = array_merge( $user_caps, $rolecaps );
}
}
$user_caps = array_unique( $user_caps );
// Is the requested capability in this list?
$return = in_array( $capability, $user_caps );
}
// Is user connecting from an admin designated IP?
if( !$return ) {
// the array of ranges: '127.0.0.0/8' will always be admin
foreach ($amp_admin_ipranges as $range) {
$return = amp_cidr_match( $_SERVER['REMOTE_ADDR'], $range );
if( $return )
break;
}
}
if( !$return ) {
if ( isset( $amp_default_role ) && in_array ($amp_default_role, array_keys( $amp_role_capabilities ) ) ) {
$default_caps = $amp_role_capabilities [ $amp_default_role ];
$return = in_array( $capability, $default_caps );
}
}
return $return;
}
// Determine whether a specific user has a role.
function amp_user_has_role( $username, $rolename ) {
global $amp_role_assignment;
// if no role assignments are created, grant everything FIXME: Make 'admin'
// so the site still works even if stuff is configured wrong
if ( empty( $amp_role_assignment ) )
return true;
// do this the case-insensitive way
// the entire array was made lowercase in environment check
$username = strtolower($username);
$rolename = strtolower($rolename);
// if the role doesn't exist, give up now.
if ( !in_array( $rolename, array_keys( $amp_role_assignment ) ) )
return false;
$users_in_role = $amp_role_assignment[$rolename];
return in_array( $username, $users_in_role );
}
/********************* KEYWORD OWNERSHIP ************************/
// Filter out restricted access to keyword data in...
// Admin list
yourls_add_filter( 'admin_list_where', 'amp_admin_list_where' );
function amp_admin_list_where($where) {
if ( amp_have_capability( ampCap::ViewAll ) )
return $where; // Allow admin/editor users to see the lot.
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$user = YOURLS_USER !== false ? YOURLS_USER : NULL;
$where['sql'] = $where['sql'] . " AND (`user` = :user OR `user` IS NULL) ";
$where['binds']['user'] = $user;
return $where;
}
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// API stats
yourls_add_filter( 'api_url_stats', 'amp_api_url_stats' );
function amp_api_url_stats( $return, $shorturl ) {
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$keyword = str_replace( YOURLS_SITE . '/' , '', $shorturl ); // accept either 'http://ozh.in/abc' or 'abc'
$keyword = yourls_sanitize_string( $keyword );
$keyword = addslashes($keyword);
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if( ( !defined('YOURLS_PRIVATE_INFOS') || YOURLS_PRIVATE_INFOS !== false )
&& !amp_access_keyword($keyword) )
return array('simple' => "URL is owned by another user", 'message' => 'URL is owned by another user', 'errorCode' => 403);
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else
return $return;
}
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// Info pages
yourls_add_action( 'pre_yourls_infos', 'amp_pre_yourls_infos' );
function amp_pre_yourls_infos( $keyword ) {
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if( yourls_is_private() && !amp_access_keyword($keyword) ) {
if ( !amp_is_valid_user() )
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yourls_redirect( yourls_admin_url( '?access=denied' ), 302 );
else
yourls_redirect( YOURLS_SITE, 302 );
}
}
// DB stats
yourls_add_filter( 'get_db_stats', 'amp_get_db_stats' );
function amp_get_db_stats( $return, $where ) {
if ( amp_have_capability( ampCap::ViewAll ) )
return $return; // Allow admin/editor users to see the lot.
// or... filter results
global $ydb;
$table_url = YOURLS_DB_TABLE_URL;
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$user = YOURLS_USER !== false ? YOURLS_USER : NULL;
$where['sql'] = $where['sql'] . " AND (`user` = :user OR `user` IS NULL) ";
$where['binds']['user'] = $user;
$sql = "SELECT COUNT(keyword) as count, SUM(clicks) as sum FROM `$table_url` WHERE 1=1 " . $where['sql'];
$binds = $where['binds'];
$totals = $ydb->fetchObject($sql, $binds);
$return = array( 'total_links' => $totals->count, 'total_clicks' => $totals->sum );
return $return;
}
// Fine tune track-me-not
yourls_add_action('redirect_shorturl', 'amp_tracking');
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function amp_tracking( $u, $k = false ) {
if( amp_is_valid_user() && ( amp_keyword_owner($k) || amp_have_capability( ampCap::Traceless ) ) ) {
// No logging
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yourls_add_filter( 'shunt_update_clicks', function( ) { return true; } );
yourls_add_filter( 'shunt_log_redirect', function( ) { return true; } );
}
}
/********************* HOUSEKEEPING ************************/
// Validate environment setup
function amp_env_check() {
global $amp_anon_capabilities;
global $amp_role_capabilities;
global $amp_role_assignment;
global $amp_admin_ipranges;
global $amp_allowed_plugin_pages;
if ( !isset( $amp_anon_capabilities) ) {
$amp_anon_capabilities = array();
}
if ( !isset( $amp_role_capabilities) ) {
$amp_role_capabilities = array(
ampRoles::Administrator => array(
ampCap::ShowAdmin,
ampCap::AddURL,
ampCap::EditURL,
ampCap::DeleteURL,
ampCap::Traceless,
ampCap::ManageAnonURL,
ampCap::ManageUsrsURL,
ampCap::ManagePlugins,
ampCap::API,
ampCap::APIu,
ampCap::ViewStats,
ampCap::ViewAll,
),
ampRoles::Editor => array(
ampCap::ShowAdmin,
ampCap::AddURL,
ampCap::EditURL,
ampCap::DeleteURL,
ampCap::Traceless,
ampCap::ManageAnonURL,
ampCap::APIu,
ampCap::ViewStats,
ampCap::ViewAll,
),
ampRoles::Contributor => array(
ampCap::ShowAdmin,
ampCap::AddURL,
ampCap::EditURL,
ampCap::DeleteURL,
ampCap::APIu,
ampCap::ViewStats,
),
);
}
if ( !isset( $amp_role_assignment ) ) {
$amp_role_assignment = array();
}
if ( !isset( $amp_admin_ipranges ) ) {
$amp_admin_ipranges = array(
'127.0.0.0/8',
);
}
if ( !isset( $amp_allowed_plugin_pages ) ) {
$amp_allowed_plugin_pages = array(
);
}
// convert role assignment table to lower case if it hasn't been done already
// this makes searches much easier!
$amp_role_assignment_lower = array();
foreach ( $amp_role_assignment as $key => $value ) {
$t_key = strtolower( $key );
$t_value = array_map('strtolower', $value);
$amp_role_assignment_lower[$t_key] = $t_value;
}
$amp_role_assignment = $amp_role_assignment_lower;
unset($amp_role_assignment_lower);
// allow manipulation of env by other plugins
// be mindfull of extending ampCap and ampRoles classes if needed
$a = $amp_anon_capabilities;
$b = $amp_role_capabilities;
$c = $amp_role_assignment;
$d = $amp_admin_ipranges;
$e = $amp_allowed_plugin_pages;
yourls_apply_filter( 'amp_env_check', $a, $b, $c, $d, $e );
return true;
}
// Activation: add the user column to the URL table if not added
yourls_add_action( 'activated_authMgrPlus/plugin.php', 'amp_activated' );
function amp_activated() {
global $ydb;
$table = YOURLS_DB_TABLE_URL;
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$sql = "DESCRIBE `".$table."`";
$results = $ydb->fetchObjects($sql);
$activated = false;
foreach($results as $r) {
if($r->Field == 'user') {
$activated = true;
}
}
if(!$activated) {
if ($version) {
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$sql = "ALTER TABLE `".$table."` ADD `user` VARCHAR(255) NULL";
$insert = $ydb->fetchAffected($sql);
} else {
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$ydb->query("ALTER TABLE `".$table."` ADD `user` VARCHAR(255) NULL");
}
}
}
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/***************** HELPER FUNCTIONS ********************/
// List currently available capabilities
function amp_current_capabilities() {
$current_capabilities = array();
$all_capabilities = array(
ampCap::ShowAdmin,
ampCap::AddURL,
ampCap::EditURL,
ampCap::DeleteURL,
ampCap::Traceless,
ampCap::ManageAnonURL,
ampCap::ManageUsrsURL,
ampCap::ManagePlugins,
ampCap::API,
ampCap::APIu,
ampCap::ViewStats,
ampCap::ViewAll,
);
// allow manipulation of this list ( be mindfull of extending the ampCap class if needed )
yourls_apply_filter( 'amp_current_capabilities', $all_capabilities);
foreach ( $all_capabilities as $cap ) {
if ( amp_have_capability( $cap ) ) {
$current_capabilities[] = $cap;
}
}
return $current_capabilities;
}
// Check for IP in a range
// from: http://stackoverflow.com/questions/594112/matching-an-ip-to-a-cidr-mask-in-php5
function amp_cidr_match($ip, $range) {
list ($subnet, $bits) = explode('/', $range);
$ip = ip2long($ip);
$subnet = ip2long($subnet);
$mask = -1 << (32 - $bits);
$subnet &= $mask; # nb: in case the supplied subnet wasn't correctly aligned
return ($ip & $mask) == $subnet;
}
// Check user access to a keyword ( can they see it )
function amp_access_keyword( $keyword ) {
$users = array( YOURLS_USER !== false ? YOURLS_USER : NULL , NULL );
$owner = amp_keyword_owner( $keyword );
if ( amp_have_capability( ampCap::ViewAll ) || in_array( $owner , $users ) )
return true;
}
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// Check user rights to a keyword ( can manage it )
function amp_manage_keyword( $keyword, $capability ) {
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$return = false; // default is to deny access
if ( amp_is_valid_user() ) { // only authenticated users can manaage keywords
$owner = amp_keyword_owner($keyword);
$user = YOURLS_USER !== false ? YOURLS_USER : NULL;
if ( amp_have_capability( ampCap::ManageUsrsURL ) // Admin?
|| ( $owner === NULL && amp_have_capability( ampCap::ManageAnonURL ) ) // Editor?
|| ( $owner === $user && amp_have_capability( $capability ) ) ); // Self Edit?
$return = true;
}
return $return;
}
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// Check keyword ownership
function amp_keyword_owner( $keyword ) {
global $ydb;
$table = YOURLS_DB_TABLE_URL;
$binds = array( 'keyword' => $keyword );
$sql = "SELECT * FROM `$table` WHERE `keyword` = :keyword";
$result = $ydb->fetchOne($sql, $binds);
return $result['user'];
}
// Record user info on keyword creation
yourls_add_action( 'insert_link', 'amp_insert_link' );
function amp_insert_link($actions) {
global $ydb;
$keyword = $actions[2];
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$user = YOURLS_USER !== false ? YOURLS_USER : NULL;
$table = YOURLS_DB_TABLE_URL;
// Insert $keyword against $username
$binds = array( 'user' => $user,
'keyword' => $keyword);
$sql = "UPDATE `$table` SET `user` = :user WHERE `keyword` = :keyword";
$result = $ydb->fetchAffected($sql, $binds);
}
// Quick user validation without triggering hooks
function amp_is_valid_user() {
$valid = defined( 'YOURLS_USER' ) ? true : false;
if ( !$valid ) {
if ( yourls_is_API()
&& isset( $_REQUEST['timestamp'] ) && !empty($_REQUEST['timestamp'] )
&& isset( $_REQUEST['signature'] ) && !empty($_REQUEST['signature'] ) )
$valid = yourls_check_signature_timestamp();
elseif ( yourls_is_API()
&& !isset( $_REQUEST['timestamp'] )
&& isset( $_REQUEST['signature'] ) && !empty( $_REQUEST['signature'] ) )
$valid = yourls_check_signature();
elseif ( isset( $_REQUEST['username'] ) && isset( $_REQUEST['password'] )
&& !empty( $_REQUEST['username'] ) && !empty( $_REQUEST['password'] ) )
$valid = yourls_check_username_password();
elseif ( !yourls_is_API() && isset( $_COOKIE[ yourls_cookie_name() ] ) )
$valid = yourls_check_auth_cookie();
}
return $valid;
}
?>