511 lines
17 KiB
PHP
511 lines
17 KiB
PHP
<?php
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/**
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* PrivateBin
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*
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* a zero-knowledge paste bin
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*
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* @link https://github.com/PrivateBin/PrivateBin
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* @copyright 2012 Sébastien SAUVAGE (sebsauvage.net)
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* @license https://www.opensource.org/licenses/zlib-license.php The zlib/libpng License
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* @version 1.1
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*/
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namespace PrivateBin;
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use Exception;
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use PrivateBin\Persistence\ServerSalt;
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use PrivateBin\Persistence\TrafficLimiter;
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/**
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* PrivateBin
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*
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* Controller, puts it all together.
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*/
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class PrivateBin
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{
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/**
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* version
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*
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* @const string
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*/
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const VERSION = '1.1';
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/**
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* show the same error message if the paste expired or does not exist
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*
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* @const string
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*/
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const GENERIC_ERROR = 'Paste does not exist, has expired or has been deleted.';
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/**
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* configuration
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*
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* @access private
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* @var Configuration
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*/
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private $_conf;
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/**
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* data
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*
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* @access private
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* @var string
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*/
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private $_data = '';
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/**
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* does the paste expire
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*
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* @access private
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* @var bool
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*/
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private $_doesExpire = false;
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/**
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* error message
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*
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* @access private
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* @var string
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*/
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private $_error = '';
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/**
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* status message
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*
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* @access private
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* @var string
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*/
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private $_status = '';
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/**
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* JSON message
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*
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* @access private
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* @var string
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*/
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private $_json = '';
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/**
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* Factory of instance models
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*
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* @access private
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* @var model
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*/
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private $_model;
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/**
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* request
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*
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* @access private
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* @var request
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*/
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private $_request;
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/**
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* URL base
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*
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* @access private
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* @var string
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*/
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private $_urlBase;
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/**
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* constructor
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*
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* initializes and runs PrivateBin
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*
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* @access public
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* @throws Exception
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* @return void
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*/
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public function __construct()
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{
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if (version_compare(PHP_VERSION, '5.3.0') < 0) {
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throw new Exception(I18n::_('PrivateBin requires php 5.3.0 or above to work. Sorry.'), 1);
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}
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if (strlen(PATH) < 0 && substr(PATH, -1) !== DIRECTORY_SEPARATOR) {
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throw new Exception(I18n::_('PrivateBin requires the PATH to end in a "%s". Please update the PATH in your index.php.', DIRECTORY_SEPARATOR), 5);
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}
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// load config from ini file, initialize required classes
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$this->_init();
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switch ($this->_request->getOperation()) {
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case 'create':
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$this->_create();
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break;
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case 'delete':
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$this->_delete(
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$this->_request->getParam('pasteid'),
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$this->_request->getParam('deletetoken')
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);
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break;
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case 'read':
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$this->_read($this->_request->getParam('pasteid'));
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break;
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case 'jsonld':
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$this->_jsonld($this->_request->getParam('jsonld'));
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return;
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}
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// output JSON or HTML
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if ($this->_request->isJsonApiCall()) {
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header('Content-type: ' . Request::MIME_JSON);
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET, POST, PUT, DELETE');
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header('Access-Control-Allow-Headers: X-Requested-With, Content-Type');
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echo $this->_json;
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} else {
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$this->_view();
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}
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}
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/**
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* initialize privatebin
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*
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* @access private
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* @return void
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*/
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private function _init()
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{
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foreach (array('cfg', 'lib') as $dir) {
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if (!is_file(PATH . $dir . DIRECTORY_SEPARATOR . '.htaccess')) {
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file_put_contents(
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PATH . $dir . DIRECTORY_SEPARATOR . '.htaccess',
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'Allow from none' . PHP_EOL .
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'Deny from all' . PHP_EOL,
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LOCK_EX
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);
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}
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}
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$this->_conf = new Configuration;
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$this->_model = new Model($this->_conf);
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$this->_request = new Request;
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$this->_urlBase = array_key_exists('REQUEST_URI', $_SERVER) ?
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htmlspecialchars($_SERVER['REQUEST_URI']) : '/';
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ServerSalt::setPath($this->_conf->getKey('dir', 'traffic'));
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// set default language
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$lang = $this->_conf->getKey('languagedefault');
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I18n::setLanguageFallback($lang);
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// force default language, if language selection is disabled and a default is set
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if (!$this->_conf->getKey('languageselection') && strlen($lang) == 2) {
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$_COOKIE['lang'] = $lang;
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setcookie('lang', $lang);
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}
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}
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/**
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* Store new paste or comment
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*
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* POST contains one or both:
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* data = json encoded SJCL encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* attachment = json encoded SJCL encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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*
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* All optional data will go to meta information:
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* expire (optional) = expiration delay (never,5min,10min,1hour,1day,1week,1month,1year,burn) (default:never)
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* formatter (optional) = format to display the paste as (plaintext,syntaxhighlighting,markdown) (default:syntaxhighlighting)
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* burnafterreading (optional) = if this paste may only viewed once ? (0/1) (default:0)
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* opendiscusssion (optional) = is the discussion allowed on this paste ? (0/1) (default:0)
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* attachmentname = json encoded SJCL encrypted text (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* nickname (optional) = in discussion, encoded SJCL encrypted text nickname of author of comment (containing keys: iv,v,iter,ks,ts,mode,adata,cipher,salt,ct)
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* parentid (optional) = in discussion, which comment this comment replies to.
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* pasteid (optional) = in discussion, which paste this comment belongs to.
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*
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* @access private
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* @return string
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*/
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private function _create()
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{
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// Ensure last paste from visitors IP address was more than configured amount of seconds ago.
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TrafficLimiter::setConfiguration($this->_conf);
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if (!TrafficLimiter::canPass()) {
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return $this->_return_message(
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1, I18n::_(
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'Please wait %d seconds between each post.',
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$this->_conf->getKey('limit', 'traffic')
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)
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);
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}
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$data = $this->_request->getParam('data');
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$attachment = $this->_request->getParam('attachment');
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$attachmentname = $this->_request->getParam('attachmentname');
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// Ensure content is not too big.
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$sizelimit = $this->_conf->getKey('sizelimit');
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if (
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strlen($data) + strlen($attachment) + strlen($attachmentname) > $sizelimit
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) {
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return $this->_return_message(
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1,
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I18n::_(
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'Paste is limited to %s of encrypted data.',
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Filter::formatHumanReadableSize($sizelimit)
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)
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);
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}
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// Ensure attachment did not get lost due to webserver limits or Suhosin
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if (strlen($attachmentname) > 0 && strlen($attachment) == 0) {
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return $this->_return_message(1, 'Attachment missing in data received by server. Please check your webserver or suhosin configuration for maximum POST parameter limitations.');
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}
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// The user posts a comment.
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$pasteid = $this->_request->getParam('pasteid');
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$parentid = $this->_request->getParam('parentid');
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if (!empty($pasteid) && !empty($parentid)) {
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$paste = $this->_model->getPaste($pasteid);
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if ($paste->exists()) {
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try {
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$comment = $paste->getComment($parentid);
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$nickname = $this->_request->getParam('nickname');
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if (!empty($nickname)) {
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$comment->setNickname($nickname);
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}
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$comment->setData($data);
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$comment->store();
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} catch (Exception $e) {
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return $this->_return_message(1, $e->getMessage());
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}
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$this->_return_message(0, $comment->getId());
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} else {
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$this->_return_message(1, 'Invalid data.');
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}
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}
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// The user posts a standard paste.
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else {
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$this->_model->purge();
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$paste = $this->_model->getPaste();
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try {
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$paste->setData($data);
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if (!empty($attachment)) {
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$paste->setAttachment($attachment);
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if (!empty($attachmentname)) {
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$paste->setAttachmentName($attachmentname);
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}
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}
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$expire = $this->_request->getParam('expire');
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if (!empty($expire)) {
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$paste->setExpiration($expire);
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}
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$burnafterreading = $this->_request->getParam('burnafterreading');
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if (!empty($burnafterreading)) {
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$paste->setBurnafterreading($burnafterreading);
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}
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$opendiscussion = $this->_request->getParam('opendiscussion');
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if (!empty($opendiscussion)) {
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$paste->setOpendiscussion($opendiscussion);
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}
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$formatter = $this->_request->getParam('formatter');
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if (!empty($formatter)) {
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$paste->setFormatter($formatter);
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}
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$paste->store();
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} catch (Exception $e) {
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return $this->_return_message(1, $e->getMessage());
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}
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$this->_return_message(0, $paste->getId(), array('deletetoken' => $paste->getDeleteToken()));
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}
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}
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/**
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* Delete an existing paste
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*
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* @access private
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* @param string $dataid
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* @param string $deletetoken
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* @return void
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*/
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private function _delete($dataid, $deletetoken)
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{
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try {
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$paste = $this->_model->getPaste($dataid);
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if ($paste->exists()) {
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// accessing this property ensures that the paste would be
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// deleted if it has already expired
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$burnafterreading = $paste->isBurnafterreading();
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if ($deletetoken == 'burnafterreading') {
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if ($burnafterreading) {
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$paste->delete();
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$this->_return_message(0, $dataid);
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} else {
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$this->_return_message(1, 'Paste is not of burn-after-reading type.');
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}
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} else {
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// Make sure the token is valid.
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if (Filter::slowEquals($deletetoken, $paste->getDeleteToken())) {
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// Paste exists and deletion token is valid: Delete the paste.
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$paste->delete();
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$this->_status = 'Paste was properly deleted.';
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} else {
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$this->_error = 'Wrong deletion token. Paste was not deleted.';
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}
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}
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} else {
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$this->_error = self::GENERIC_ERROR;
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}
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} catch (Exception $e) {
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$this->_error = $e->getMessage();
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}
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}
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/**
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* Read an existing paste or comment
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*
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* @access private
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* @param string $dataid
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* @return void
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*/
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private function _read($dataid)
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{
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try {
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$paste = $this->_model->getPaste($dataid);
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if ($paste->exists()) {
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$data = $paste->get();
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$this->_doesExpire = property_exists($data, 'meta') && property_exists($data->meta, 'expire_date');
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if (property_exists($data->meta, 'salt')) {
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unset($data->meta->salt);
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}
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$this->_data = json_encode($data);
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} else {
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$this->_error = self::GENERIC_ERROR;
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}
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} catch (Exception $e) {
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$this->_error = $e->getMessage();
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}
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if ($this->_request->isJsonApiCall()) {
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if (strlen($this->_error)) {
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$this->_return_message(1, $this->_error);
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} else {
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$this->_return_message(0, $dataid, json_decode($this->_data, true));
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}
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}
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}
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/**
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* Display PrivateBin frontend.
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*
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* @access private
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* @return void
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*/
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private function _view()
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{
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// set headers to disable caching
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$time = gmdate('D, d M Y H:i:s \G\M\T');
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header('Cache-Control: no-store, no-cache, no-transform, must-revalidate');
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header('Pragma: no-cache');
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header('Expires: ' . $time);
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header('Last-Modified: ' . $time);
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header('Vary: Accept');
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header('Content-Security-Policy: ' . $this->_conf->getKey('cspheader'));
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header('X-Xss-Protection: 1; mode=block');
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header('X-Frame-Options: DENY');
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header('X-Content-Type-Options: nosniff');
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// label all the expiration options
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$expire = array();
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foreach ($this->_conf->getSection('expire_options') as $time => $seconds) {
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$expire[$time] = ($seconds == 0) ? I18n::_(ucfirst($time)) : Filter::formatHumanReadableTime($time);
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}
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// translate all the formatter options
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$formatters = array_map('PrivateBin\\I18n::_', $this->_conf->getSection('formatter_options'));
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// set language cookie if that functionality was enabled
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$languageselection = '';
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if ($this->_conf->getKey('languageselection')) {
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$languageselection = I18n::getLanguage();
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setcookie('lang', $languageselection);
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}
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$page = new View;
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$page->assign('CIPHERDATA', $this->_data);
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$page->assign('ERROR', I18n::_($this->_error));
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$page->assign('STATUS', I18n::_($this->_status));
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$page->assign('VERSION', self::VERSION);
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$page->assign('DISCUSSION', $this->_conf->getKey('discussion'));
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$page->assign('OPENDISCUSSION', $this->_conf->getKey('opendiscussion'));
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$page->assign('MARKDOWN', array_key_exists('markdown', $formatters));
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$page->assign('SYNTAXHIGHLIGHTING', array_key_exists('syntaxhighlighting', $formatters));
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$page->assign('SYNTAXHIGHLIGHTINGTHEME', $this->_conf->getKey('syntaxhighlightingtheme'));
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$page->assign('FORMATTER', $formatters);
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$page->assign('FORMATTERDEFAULT', $this->_conf->getKey('defaultformatter'));
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$page->assign('NOTICE', I18n::_($this->_conf->getKey('notice')));
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$page->assign('BURNAFTERREADINGSELECTED', $this->_conf->getKey('burnafterreadingselected'));
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$page->assign('PASSWORD', $this->_conf->getKey('password'));
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$page->assign('FILEUPLOAD', $this->_conf->getKey('fileupload'));
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$page->assign('ZEROBINCOMPATIBILITY', $this->_conf->getKey('zerobincompatibility'));
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$page->assign('LANGUAGESELECTION', $languageselection);
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$page->assign('LANGUAGES', I18n::getLanguageLabels(I18n::getAvailableLanguages()));
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$page->assign('EXPIRE', $expire);
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$page->assign('EXPIREDEFAULT', $this->_conf->getKey('default', 'expire'));
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$page->assign('EXPIRECLONE', !$this->_doesExpire || ($this->_doesExpire && $this->_conf->getKey('clone', 'expire')));
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$page->assign('URLSHORTENER', $this->_conf->getKey('urlshortener'));
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$page->draw($this->_conf->getKey('template'));
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}
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/**
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* outputs requested JSON-LD context
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*
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* @access private
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* @param string $type
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* @return void
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*/
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private function _jsonld($type)
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{
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if (
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$type !== 'paste' && $type !== 'comment' &&
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$type !== 'pastemeta' && $type !== 'commentmeta'
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) {
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$type = '';
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}
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$content = '{}';
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$file = PUBLIC_PATH . DIRECTORY_SEPARATOR . 'js' . DIRECTORY_SEPARATOR . $type . '.jsonld';
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if (is_readable($file)) {
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$content = str_replace(
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'?jsonld=',
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$this->_urlBase . '?jsonld=',
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file_get_contents($file)
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);
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}
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header('Content-type: application/ld+json');
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header('Access-Control-Allow-Origin: *');
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header('Access-Control-Allow-Methods: GET');
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echo $content;
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}
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/**
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* prepares JSON encoded status message
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*
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* @access private
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* @param int $status
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* @param string $message
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* @param array $other
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* @return void
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*/
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private function _return_message($status, $message, $other = array())
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{
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$result = array('status' => $status);
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if ($status) {
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$result['message'] = I18n::_($message);
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} else {
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$result['id'] = $message;
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$result['url'] = $this->_urlBase . '?' . $message;
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}
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$result += $other;
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$this->_json = json_encode($result);
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}
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}
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