<?php
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/*
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Copyright (c) 2007, Till Brehm, projektfarm Gmbh
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of ISPConfig nor the names of its contributors
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may be used to endorse or promote products derived from this software without
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specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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class shelluser_base_plugin {
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var $plugin_name = 'shelluser_base_plugin';
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var $class_name = 'shelluser_base_plugin';
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var $min_uid = 499;
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//* This function is called during ispconfig installation to determine
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// if a symlink shall be created for this plugin.
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function onInstall() {
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global $conf;
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if($conf['services']['web'] == true) {
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return true;
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} else {
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return false;
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}
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}
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/*
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This function is called when the plugin is loaded
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*/
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function onLoad() {
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global $app;
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/*
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Register for the events
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*/
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$app->plugins->registerEvent('shell_user_insert', $this->plugin_name, 'insert');
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$app->plugins->registerEvent('shell_user_update', $this->plugin_name, 'update');
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$app->plugins->registerEvent('shell_user_delete', $this->plugin_name, 'delete');
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}
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function insert($event_name, $data) {
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global $app, $conf;
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$app->uses('system,getconf');
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$security_config = $app->getconf->get_security_config('permissions');
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if($security_config['allow_shell_user'] != 'yes') {
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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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//* Check if the resulting path is inside the docroot
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ?", $data['new']['parent_domain_id']);
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if(substr($data['new']['dir'],0,strlen($web['document_root'])) != $web['document_root']) {
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$app->log('Directory of the shell user is outside of website docroot.',LOGLEVEL_WARN);
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return false;
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}
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if(strpos($data['new']['dir'], '/../') !== false || substr($data['new']['dir'],-3) == '/..') {
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$app->log('Directory of the shell user is not valid.',LOGLEVEL_WARN);
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return false;
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}
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if(!$app->system->is_allowed_user($data['new']['username'], false, false)
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|| !$app->system->is_allowed_user($data['new']['puser'], true, true)
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|| !$app->system->is_allowed_group($data['new']['pgroup'], true, true)) {
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$app->log('Shell user must not be root or in group root.',LOGLEVEL_WARN);
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return false;
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}
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if($app->system->is_user($data['new']['puser'])) {
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// Get the UID of the parent user
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$uid = intval($app->system->getuid($data['new']['puser']));
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if($uid > $this->min_uid) {
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//* Remove webfolder protection
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$app->system->web_folder_protection($web['document_root'], false);
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if(!is_dir($data['new']['dir'])){
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$app->file->mkdirs(escapeshellcmd($data['new']['dir']), '0700');
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$app->system->chown(escapeshellcmd($data['new']['dir']),escapeshellcmd($data['new']['username']));
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$app->system->chgrp(escapeshellcmd($data['new']['dir']),escapeshellcmd($data['new']['pgroup']));
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}
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$command = 'useradd';
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$command .= ' -d '.escapeshellcmd($data['new']['dir']);
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$command .= ' -g '.escapeshellcmd($data['new']['pgroup']);
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$command .= ' -o '; // non unique
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if($data['new']['password'] != '') $command .= ' -p '.escapeshellcmd($data['new']['password']);
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$command .= ' -s '.escapeshellcmd($data['new']['shell']);
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$command .= ' -u '.escapeshellcmd($uid);
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$command .= ' '.escapeshellcmd($data['new']['username']);
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exec($command);
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$app->log("Executed command: ".$command, LOGLEVEL_DEBUG);
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$app->log("Added shelluser: ".$data['new']['username'], LOGLEVEL_DEBUG);
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// call the ssh-rsa update function
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$app->uses("getconf");
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$this->data = $data;
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$this->app = $app;
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$this->_setup_ssh_rsa();
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//* Create .bash_history file
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$app->system->touch(escapeshellcmd($data['new']['dir']).'/.bash_history');
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$app->system->chmod(escapeshellcmd($data['new']['dir']).'/.bash_history', 0755);
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$app->system->chown(escapeshellcmd($data['new']['dir']).'/.bash_history', $data['new']['username']);
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$app->system->chgrp(escapeshellcmd($data['new']['dir']).'/.bash_history', $data['new']['pgroup']);
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//* Disable shell user temporarily if we use jailkit
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if($data['new']['chroot'] == 'jailkit') {
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$command = 'usermod -s /bin/false -L '.escapeshellcmd($data['new']['username']).' 2>/dev/null';
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exec($command);
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$app->log("Disabling shelluser temporarily: ".$command, LOGLEVEL_DEBUG);
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}
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//* Add webfolder protection again
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$app->system->web_folder_protection($web['document_root'], true);
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} else {
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$app->log("UID = $uid for shelluser:".$data['new']['username']." not allowed.", LOGLEVEL_ERROR);
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}
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} else {
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$app->log("Skipping insertion of user:".$data['new']['username'].", parent user ".$data['new']['puser']." does not exist.", LOGLEVEL_WARN);
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}
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}
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function update($event_name, $data) {
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global $app, $conf;
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$app->uses('system,getconf');
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$security_config = $app->getconf->get_security_config('permissions');
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if($security_config['allow_shell_user'] != 'yes') {
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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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//* Check if the resulting path is inside the docroot
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ?", $data['new']['parent_domain_id']);
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if(substr($data['new']['dir'],0,strlen($web['document_root'])) != $web['document_root']) {
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$app->log('Directory of the shell user is outside of website docroot.',LOGLEVEL_WARN);
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return false;
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}
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if(strpos($data['new']['dir'], '/../') !== false || substr($data['new']['dir'],-3) == '/..') {
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$app->log('Directory of the shell user is not valid.',LOGLEVEL_WARN);
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return false;
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}
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if(!$app->system->is_allowed_user($data['new']['username'], false, false)
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|| !$app->system->is_allowed_user($data['new']['puser'], true, true)
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|| !$app->system->is_allowed_group($data['new']['pgroup'], true, true)) {
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$app->log('Shell user must not be root or in group root.',LOGLEVEL_WARN);
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return false;
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}
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if($app->system->is_user($data['new']['puser'])) {
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// Get the UID of the parent user
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$uid = intval($app->system->getuid($data['new']['puser']));
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if($uid > $this->min_uid) {
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// Check if the user that we want to update exists, if not, we insert it
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if($app->system->is_user($data['old']['username'])) {
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/*
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$command = 'usermod';
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$command .= ' --home '.escapeshellcmd($data['new']['dir']);
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$command .= ' --gid '.escapeshellcmd($data['new']['pgroup']);
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// $command .= ' --non-unique ';
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$command .= ' --password '.escapeshellcmd($data['new']['password']);
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if($data['new']['chroot'] != 'jailkit') $command .= ' --shell '.escapeshellcmd($data['new']['shell']);
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// $command .= ' --uid '.escapeshellcmd($uid);
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$command .= ' --login '.escapeshellcmd($data['new']['username']);
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$command .= ' '.escapeshellcmd($data['old']['username']);
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exec($command);
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$app->log("Executed command: $command ",LOGLEVEL_DEBUG);
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*/
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//$groupinfo = $app->system->posix_getgrnam($data['new']['pgroup']);
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if($data['new']['dir'] != $data['old']['dir'] && !is_dir($data['new']['dir'])){
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$app->file->mkdirs(escapeshellcmd($data['new']['dir']), '0700');
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$app->system->chown(escapeshellcmd($data['new']['dir']),escapeshellcmd($data['new']['username']));
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$app->system->chgrp(escapeshellcmd($data['new']['dir']),escapeshellcmd($data['new']['pgroup']));
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}
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$app->system->usermod($data['old']['username'], 0, $app->system->getgid($data['new']['pgroup']), $data['new']['dir'], $data['new']['shell'], $data['new']['password'], $data['new']['username']);
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$app->log("Updated shelluser: ".$data['old']['username'], LOGLEVEL_DEBUG);
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// call the ssh-rsa update function
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$app->uses("getconf");
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$this->data = $data;
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$this->app = $app;
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$this->_setup_ssh_rsa();
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//* Create .bash_history file
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if(!is_file($data['new']['dir']).'/.bash_history') {
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$app->system->touch(escapeshellcmd($data['new']['dir']).'/.bash_history');
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$app->system->chmod(escapeshellcmd($data['new']['dir']).'/.bash_history', 0755);
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$app->system->chown(escapeshellcmd($data['new']['dir']).'/.bash_history', escapeshellcmd($data['new']['username']));
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$app->system->chgrp(escapeshellcmd($data['new']['dir']).'/.bash_history', escapeshellcmd($data['new']['pgroup']));
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}
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} else {
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// The user does not exist, so we insert it now
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$this->insert($event_name, $data);
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}
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} else {
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$app->log("UID = $uid for shelluser:".$data['new']['username']." not allowed.", LOGLEVEL_ERROR);
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}
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} else {
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$app->log("Skipping update for user:".$data['new']['username'].", parent user ".$data['new']['puser']." does not exist.", LOGLEVEL_WARN);
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}
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}
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function delete($event_name, $data) {
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global $app, $conf;
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$app->uses('system,getconf');
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$security_config = $app->getconf->get_security_config('permissions');
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if($security_config['allow_shell_user'] != 'yes') {
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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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if($app->system->is_user($data['old']['username'])) {
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// Get the UID of the user
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$userid = intval($app->system->getuid($data['old']['username']));
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if($userid > $this->min_uid) {
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// check if we have to delete the dir
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$check = $app->db->queryOneRecord('SELECT shell_user_id FROM `shell_user` WHERE `dir` = ?', $data['old']['dir']);
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if(!$check && is_dir($data['old']['dir'])) {
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ?", $data['old']['parent_domain_id']);
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$app->system->web_folder_protection($web['document_root'], false);
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// delete dir
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$homedir = $data['old']['dir'];
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if(substr($homedir, -1) !== '/') $homedir .= '/';
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$files = array('.bash_logout', '.bash_history', '.bashrc', '.profile');
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$dirs = array('.ssh', '.cache');
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foreach($files as $delfile) {
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if(is_file($homedir . $delfile) && fileowner($homedir . $delfile) == $userid) unlink($homedir . $delfile);
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}
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foreach($dirs as $deldir) {
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if(is_dir($homedir . $deldir) && fileowner($homedir . $deldir) == $userid) exec('rm -rf ' . escapeshellarg($homedir . $deldir));
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}
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$empty = true;
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$dirres = opendir($homedir);
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if($dirres) {
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while(($entry = readdir($dirres)) !== false) {
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if($entry != '.' && $entry != '..') {
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$empty = false;
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break;
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}
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}
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closedir($dirres);
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}
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if($empty == true) {
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rmdir($homedir);
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}
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unset($files);
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unset($dirs);
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$app->system->web_folder_protection($web['document_root'], true);
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}
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// We delete only non jailkit users, jailkit users will be deleted by the jailkit plugin.
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if ($data['old']['chroot'] != "jailkit") {
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$command = 'killall -u '.escapeshellcmd($data['old']['username']).' ; userdel -f';
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$command .= ' '.escapeshellcmd($data['old']['username']).' &> /dev/null';
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exec($command);
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$app->log("Deleted shelluser: ".$data['old']['username'], LOGLEVEL_DEBUG);
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}
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} else {
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$app->log("UID = $userid for shelluser:".$data['old']['username']." not allowed.", LOGLEVEL_ERROR);
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}
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} else {
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$app->log("User:".$data['new']['username']." does not exist in in /etc/passwd, skipping delete.", LOGLEVEL_WARN);
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}
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}
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private function _setup_ssh_rsa() {
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global $app;
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$this->app->log("ssh-rsa setup shelluser_base", LOGLEVEL_DEBUG);
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// Get the client ID, username, and the key
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$domain_data = $this->app->db->queryOneRecord('SELECT sys_groupid FROM web_domain WHERE web_domain.domain_id = ?', $this->data['new']['parent_domain_id']);
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$sys_group_data = $this->app->db->queryOneRecord('SELECT * FROM sys_group WHERE sys_group.groupid = ?', $domain_data['sys_groupid']);
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$id = intval($sys_group_data['client_id']);
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$username= $sys_group_data['name'];
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$client_data = $this->app->db->queryOneRecord('SELECT * FROM client WHERE client.client_id = ?', $id);
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$userkey = $client_data['ssh_rsa'];
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unset($domain_data);
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unset($client_data);
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// ssh-rsa authentication variables
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//$sshrsa = $this->data['new']['ssh_rsa'];
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$sshrsa = '';
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$ssh_users = $app->db->queryAllRecords("SELECT ssh_rsa FROM shell_user WHERE parent_domain_id = ?", $this->data['new']['parent_domain_id']);
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if(is_array($ssh_users)) {
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foreach($ssh_users as $sshu) {
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if($sshu['ssh_rsa'] != '') $sshrsa .= "\n".$sshu['ssh_rsa'];
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}
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}
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$sshrsa = trim($sshrsa);
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$usrdir = escapeshellcmd($this->data['new']['dir']);
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$sshdir = $usrdir.'/.ssh';
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$sshkeys= $usrdir.'/.ssh/authorized_keys';
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$app->uses('file');
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$sshrsa = $app->file->unix_nl($sshrsa);
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$sshrsa = $app->file->remove_blank_lines($sshrsa, 0);
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// If this user has no key yet, generate a pair
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if ($userkey == '' && $id > 0){
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//Generate ssh-rsa-keys
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exec('ssh-keygen -t rsa -C '.$username.'-rsa-key-'.time().' -f /tmp/id_rsa -N ""');
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// use the public key that has been generated
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$userkey = $app->system->file_get_contents('/tmp/id_rsa.pub');
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// save keypair in client table
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$this->app->db->query("UPDATE client SET created_at = UNIX_TIMESTAMP(), id_rsa = ?, ssh_rsa = ? WHERE client_id = ?", $app->system->file_get_contents('/tmp/id_rsa'), $userkey, $id);
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$app->system->unlink('/tmp/id_rsa');
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$app->system->unlink('/tmp/id_rsa.pub');
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$this->app->log("ssh-rsa keypair generated for ".$username, LOGLEVEL_DEBUG);
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};
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if (!file_exists($sshkeys)){
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// add root's key
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$app->file->mkdirs($sshdir, '0700');
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if(is_file('/root/.ssh/authorized_keys')) $app->system->file_put_contents($sshkeys, $app->system->file_get_contents('/root/.ssh/authorized_keys'));
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// Remove duplicate keys
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$existing_keys = @file($sshkeys);
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$new_keys = explode("\n", $userkey);
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$final_keys_arr = @array_merge($existing_keys, $new_keys);
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$new_final_keys_arr = array();
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if(is_array($final_keys_arr) && !empty($final_keys_arr)){
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foreach($final_keys_arr as $key => $val){
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$new_final_keys_arr[$key] = trim($val);
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}
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}
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$final_keys = implode("\n", array_flip(array_flip($new_final_keys_arr)));
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// add the user's key
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$app->system->file_put_contents($sshkeys, $final_keys);
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$app->file->remove_blank_lines($sshkeys);
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$this->app->log("ssh-rsa authorisation keyfile created in ".$sshkeys, LOGLEVEL_DEBUG);
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}
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//* Get the keys
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$existing_keys = file($sshkeys);
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$new_keys = explode("\n", $sshrsa);
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$old_keys = explode("\n", $this->data['old']['ssh_rsa']);
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//* Remove all old keys
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if(is_array($old_keys)) {
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foreach($old_keys as $key => $val) {
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$k = array_search(trim($val), $existing_keys);
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unset($existing_keys[$k]);
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}
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}
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//* merge the remaining keys and the ones fom the ispconfig database.
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if(is_array($new_keys)) {
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$final_keys_arr = array_merge($existing_keys, $new_keys);
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} else {
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$final_keys_arr = $existing_keys;
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}
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$new_final_keys_arr = array();
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if(is_array($final_keys_arr) && !empty($final_keys_arr)){
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foreach($final_keys_arr as $key => $val){
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$new_final_keys_arr[$key] = trim($val);
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}
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}
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$final_keys = implode("\n", array_flip(array_flip($new_final_keys_arr)));
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// add the custom key
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$app->system->file_put_contents($sshkeys, $final_keys);
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$app->file->remove_blank_lines($sshkeys);
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$this->app->log("ssh-rsa key updated in ".$sshkeys, LOGLEVEL_DEBUG);
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// set proper file permissions
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exec("chown -R ".escapeshellcmd($this->data['new']['puser']).":".escapeshellcmd($this->data['new']['pgroup'])." ".$sshdir);
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exec("chmod 600 '$sshkeys'");
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}
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} // end class
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?>
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