<?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_jailkit_plugin {
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//* $plugin_name and $class_name have to be the same then the name of this class
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var $plugin_name = 'shelluser_jailkit_plugin';
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var $class_name = 'shelluser_jailkit_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', $this->plugin_name, 'delete');
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}
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//* This function is called, when a shell user is inserted in the database
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function insert($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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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ".$data['new']['parent_domain_id']);
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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 > $this->min_uid) {
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if($app->system->is_user($data['new']['username'])) {
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/**
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* Setup Jailkit Chroot System If Enabled
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*/
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if ($data['new']['chroot'] == "jailkit")
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{
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// load the server configuration options
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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->jailkit_config = $app->getconf->get_server_config($conf["server_id"], 'jailkit');
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$this->_update_website_security_level();
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$app->system->web_folder_protection($web['document_root'], false);
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$this->_setup_jailkit_chroot();
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$this->_add_jailkit_user();
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//* call the ssh-rsa update function
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$this->_setup_ssh_rsa();
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//$command .= 'usermod -s /usr/sbin/jk_chrootsh -U '.escapeshellcmd($data['new']['username']);
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//exec($command);
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$app->system->usermod($data['new']['username'], 0, 0, '', '/usr/sbin/jk_chrootsh', '', '');
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//* Unlock user
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$command = 'usermod -U '.escapeshellcmd($data['new']['username']).' 2>/dev/null';
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exec($command);
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$this->_update_website_security_level();
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$app->system->web_folder_protection($web['document_root'], true);
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}
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$app->log("Jailkit Plugin -> insert username:".$data['new']['username'], LOGLEVEL_DEBUG);
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} else {
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$app->log("Jailkit Plugin -> insert username:".$data['new']['username']." skipped, the user does not exist.", LOGLEVEL_WARN);
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}
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} else {
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$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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$app->log("Skipping insertion of user:".$data['new']['username'].", parent user ".$data['new']['puser']." does not exist.", LOGLEVEL_WARN);
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}
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}
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//* This function is called, when a shell user is updated in the database
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function update($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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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ".$data['new']['parent_domain_id']);
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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 > $this->min_uid) {
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if($app->system->is_user($data['new']['username'])) {
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/**
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* Setup Jailkit Chroot System If Enabled
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*/
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if ($data['new']['chroot'] == "jailkit")
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{
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// load the server configuration options
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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->jailkit_config = $app->getconf->get_server_config($conf["server_id"], 'jailkit');
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$this->_update_website_security_level();
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$app->system->web_folder_protection($web['document_root'], false);
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$this->_setup_jailkit_chroot();
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$this->_add_jailkit_user();
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//* call the ssh-rsa update function
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$this->_setup_ssh_rsa();
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$this->_update_website_security_level();
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$app->system->web_folder_protection($web['document_root'], true);
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}
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$app->log("Jailkit Plugin -> update username:".$data['new']['username'], LOGLEVEL_DEBUG);
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} else {
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$app->log("Jailkit Plugin -> update username:".$data['new']['username']." skipped, the user does not exist.", LOGLEVEL_WARN);
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}
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} else {
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$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 ".$data['new']['puser']." does not exist.", LOGLEVEL_WARN);
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}
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}
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//* This function is called, when a shell user is deleted in the database
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/**
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* TODO: Remove chroot user home and from the chroot passwd file
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*/
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function delete($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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$app->log('Shell user plugin disabled by security settings.',LOGLEVEL_WARN);
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return false;
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}
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ".$data['old']['parent_domain_id']);
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if ($data['old']['chroot'] == "jailkit")
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{
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$app->uses("getconf");
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$this->jailkit_config = $app->getconf->get_server_config($conf["server_id"], 'jailkit');
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$jailkit_chroot_userhome = $this->_get_home_dir($data['old']['username']);
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//commented out proved to be dangerous on config errors
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//exec('rm -rf '.$data['old']['dir'].$jailkit_chroot_userhome);
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$app->system->web_folder_protection($web['document_root'], false);
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if(@is_dir($data['old']['dir'].$jailkit_chroot_userhome)) {
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$userid = intval($app->system->getuid($data['old']['username']));
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$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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$this->_delete_homedir($data['old']['dir'].$jailkit_chroot_userhome,$userid,$data['old']['parent_domain_id']);
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$app->log("Jailkit Plugin -> delete chroot home:".$data['old']['dir'].$jailkit_chroot_userhome, LOGLEVEL_DEBUG);
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}
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$app->system->web_folder_protection($web['document_root'], true);
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}
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$app->log("Jailkit Plugin -> delete username:".$data['old']['username'], LOGLEVEL_DEBUG);
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}
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function _setup_jailkit_chroot()
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{
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global $app;
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//check if the chroot environment is created yet if not create it with a list of program sections from the config
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if (!is_dir($this->data['new']['dir'].'/etc/jailkit'))
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{
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$command = '/usr/local/ispconfig/server/scripts/create_jailkit_chroot.sh';
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$command .= ' '.escapeshellcmd($this->data['new']['dir']);
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$command .= ' \''.$this->jailkit_config['jailkit_chroot_app_sections'].'\'';
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exec($command.' 2>/dev/null');
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$this->app->log("Added jailkit chroot with command: ".$command, LOGLEVEL_DEBUG);
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$this->_add_jailkit_programs();
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//add bash.bashrc script
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//we need to collect the domain name to be used as the HOSTNAME in the bashrc script
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$web = $this->app->db->queryOneRecord("SELECT domain FROM web_domain WHERE domain_id = ".intval($this->data['new']["parent_domain_id"]));
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$this->app->load('tpl');
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$tpl = new tpl();
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$tpl->newTemplate("bash.bashrc.master");
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$tpl->setVar('jailkit_chroot', true);
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$tpl->setVar('domain', $web['domain']);
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$tpl->setVar('home_dir', $this->_get_home_dir(""));
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$bashrc = escapeshellcmd($this->data['new']['dir']).'/etc/bash.bashrc';
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if(@is_file($bashrc) || @is_link($bashrc)) unlink($bashrc);
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file_put_contents($bashrc, $tpl->grab());
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unset($tpl);
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$this->app->log("Added bashrc script : ".$bashrc, LOGLEVEL_DEBUG);
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$tpl = new tpl();
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$tpl->newTemplate("motd.master");
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$tpl->setVar('domain', $web['domain']);
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$motd = escapeshellcmd($this->data['new']['dir']).'/var/run/motd';
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if(@is_file($motd) || @is_link($motd)) unlink($motd);
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$app->system->file_put_contents($motd, $tpl->grab());
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}
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}
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function _add_jailkit_programs()
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{
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//copy over further programs and its libraries
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$command = '/usr/local/ispconfig/server/scripts/create_jailkit_programs.sh';
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$command .= ' '.escapeshellcmd($this->data['new']['dir']);
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$command .= ' \''.$this->jailkit_config['jailkit_chroot_app_programs'].'\'';
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exec($command.' 2>/dev/null');
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$this->app->log("Added programs to jailkit chroot with command: ".$command, LOGLEVEL_DEBUG);
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}
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function _get_home_dir($username)
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{
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return str_replace("[username]", escapeshellcmd($username), $this->jailkit_config['jailkit_chroot_home']);
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}
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function _add_jailkit_user()
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{
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global $app;
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//add the user to the chroot
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$jailkit_chroot_userhome = $this->_get_home_dir($this->data['new']['username']);
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$jailkit_chroot_puserhome = $this->_get_home_dir($this->data['new']['puser']);
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if(!is_dir($this->data['new']['dir'].'/etc')) mkdir($this->data['new']['dir'].'/etc', 0755);
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if(!is_file($this->data['new']['dir'].'/etc/passwd')) touch($this->data['new']['dir'].'/etc/passwd', 0755);
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// IMPORTANT!
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// ALWAYS create the user. Even if the user was created before
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// if we check if the user exists, then a update (no shell -> jailkit) will not work
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// and the user has FULL ACCESS to the root of the server!
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$command = '/usr/local/ispconfig/server/scripts/create_jailkit_user.sh';
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$command .= ' '.escapeshellcmd($this->data['new']['username']);
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$command .= ' '.escapeshellcmd($this->data['new']['dir']);
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$command .= ' '.$jailkit_chroot_userhome;
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$command .= ' '.escapeshellcmd($this->data['new']['shell']);
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$command .= ' '.$this->data['new']['puser'];
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$command .= ' '.$jailkit_chroot_puserhome;
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exec($command.' 2>/dev/null');
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//* Change the homedir of the shell user and parent user
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//* We have to do this manually as the usermod command fails
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//* when the user is logged in or a command is running under that user
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/*
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$passwd_file_array = file('/etc/passwd');
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$passwd_out = '';
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if(is_array($passwd_file_array)) {
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foreach($passwd_file_array as $line) {
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$line = trim($line);
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$parts = explode(':',$line);
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if($parts[0] == $this->data['new']['username']) {
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$parts[5] = escapeshellcmd($this->data['new']['dir'].'/.'.$jailkit_chroot_userhome);
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$parts[6] = escapeshellcmd('/usr/sbin/jk_chrootsh');
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$new_line = implode(':',$parts);
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copy('/etc/passwd','/etc/passwd~');
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chmod('/etc/passwd~',0600);
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$app->uses('system');
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$app->system->replaceLine('/etc/passwd',$line,$new_line,1,0);
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}
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}
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}*/
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$app->system->usermod($this->data['new']['username'], 0, 0, $this->data['new']['dir'].'/.'.$jailkit_chroot_userhome, '/usr/sbin/jk_chrootsh');
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$app->system->usermod($this->data['new']['puser'], 0, 0, $this->data['new']['dir'].'/.'.$jailkit_chroot_userhome, '/usr/sbin/jk_chrootsh');
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$this->app->log("Added jailkit user to chroot with command: ".$command, LOGLEVEL_DEBUG);
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if(!is_dir($this->data['new']['dir'].$jailkit_chroot_userhome)) mkdir(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_userhome), 0755, true);
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$app->system->chown(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_userhome), $this->data['new']['username']);
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$app->system->chgrp(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_userhome), $this->data['new']['pgroup']);
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$this->app->log("Added created jailkit user home in : ".$this->data['new']['dir'].$jailkit_chroot_userhome, LOGLEVEL_DEBUG);
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if(!is_dir($this->data['new']['dir'].$jailkit_chroot_puserhome)) mkdir(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_puserhome), 0755, true);
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$app->system->chown(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_puserhome), $this->data['new']['puser']);
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$app->system->chgrp(escapeshellcmd($this->data['new']['dir'].$jailkit_chroot_puserhome), $this->data['new']['pgroup']);
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$this->app->log("Added jailkit parent user home in : ".$this->data['new']['dir'].$jailkit_chroot_puserhome, LOGLEVEL_DEBUG);
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}
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//* Update the website root directory permissions depending on the security level
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function _update_website_security_level() {
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global $app, $conf;
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// load the server configuration options
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$app->uses("getconf");
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$web_config = $app->getconf->get_server_config($conf["server_id"], 'web');
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// Get the parent website of this shell user
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$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ".$this->data['new']['parent_domain_id']);
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//* If the security level is set to high
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if($web_config['security_level'] == 20 && is_array($web)) {
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$app->system->web_folder_protection($web["document_root"], false);
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$app->system->chmod($web["document_root"], 0755);
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$app->system->chown($web["document_root"], 'root');
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$app->system->chgrp($web["document_root"], 'root');
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$app->system->web_folder_protection($web["document_root"], true);
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}
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}
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//* Wrapper for exec function for easier debugging
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private function _exec($command) {
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global $app;
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$app->log('exec: '.$command, LOGLEVEL_DEBUG);
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exec($command);
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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_jailkit", LOGLEVEL_DEBUG);
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// Get the client ID, username, and the key
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$domain_data = $this->app->db->queryOneRecord('SELECT sys_groupid FROM web_domain WHERE web_domain.domain_id = '.intval($this->data['new']['parent_domain_id']));
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$sys_group_data = $this->app->db->queryOneRecord('SELECT * FROM sys_group WHERE sys_group.groupid = '.intval($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 = $this->data['new']['ssh_rsa'];
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$usrdir = escapeshellcmd($this->data['new']['dir']).'/'.$this->_get_home_dir($this->data['new']['username']);
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$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 = ".time().", id_rsa = '".$app->db->quote($app->system->file_get_contents('/tmp/id_rsa'))."', ssh_rsa = '".$app->db->quote($userkey)."' WHERE client_id = ".$id);
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$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, '0755');
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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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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 ".$sshkeys, LOGLEVEL_DEBUG);
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// set proper file permissions
|
exec("chown -R ".escapeshellcmd($this->data['new']['puser']).":".escapeshellcmd($this->data['new']['pgroup'])." ".$sshdir);
|
exec("chmod 700 ".$sshdir);
|
exec("chmod 600 '$sshkeys'");
|
|
}
|
|
private function _delete_homedir($homedir,$userid,$parent_domain_id) {
|
global $app, $conf;
|
|
// check if we have to delete the dir
|
$check = $app->db->queryOneRecord('SELECT shell_user_id FROM `shell_user` WHERE `dir` = \'' . $app->db->quote($homedir) . '\'');
|
|
if(!$check && is_dir($homedir)) {
|
$web = $app->db->queryOneRecord("SELECT * FROM web_domain WHERE domain_id = ".intval($parent_domain_id));
|
$app->system->web_folder_protection($web['document_root'], false);
|
|
// delete dir
|
if(substr($homedir, -1) !== '/') $homedir .= '/';
|
$files = array('.bash_logout', '.bash_history', '.bashrc', '.profile');
|
$dirs = array('.ssh', '.cache');
|
foreach($files as $delfile) {
|
if(is_file($homedir . $delfile) && fileowner($homedir . $delfile) == $userid) unlink($homedir . $delfile);
|
}
|
foreach($dirs as $deldir) {
|
if(is_dir($homedir . $deldir) && fileowner($homedir . $deldir) == $userid) exec('rm -rf ' . escapeshellarg($homedir . $deldir));
|
}
|
$empty = true;
|
$dirres = opendir($homedir);
|
if($dirres) {
|
while(($entry = readdir($dirres)) !== false) {
|
if($entry != '.' && $entry != '..') {
|
$empty = false;
|
break;
|
}
|
}
|
closedir($dirres);
|
}
|
if($empty == true) {
|
rmdir($homedir);
|
}
|
unset($files);
|
unset($dirs);
|
|
$app->system->web_folder_protection($web['document_root'], true);
|
}
|
|
}
|
|
} // end class
|
|
?>
|
