317 lines
10 KiB
PHP
317 lines
10 KiB
PHP
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<?php
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/**
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* MailEngine class
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* @author Brian Wong <bwsource@users.sourceforge.net>
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* @version 04-12-05
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* @package MailEngine
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*
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* Copyright (C) 2003 - 2007 MailZu
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* License: GPL, see LICENSE
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*/
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/**
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* Base directory of application
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*/
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@define('BASE_DIR', dirname(__FILE__) . '/..');
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/**
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* CmnFns class
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*/
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include_once('CmnFns.class.php');
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/**
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* Pear::DB
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*/
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if ($GLOBALS['conf']['app']['safeMode']) {
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ini_set('include_path', ( dirname(__FILE__) . '/pear/' . PATH_SEPARATOR . ini_get('include_path') ));
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include_once('pear/Mail/mimeDecode.php');
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}
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else {
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include_once('Mail/mimeDecode.php');
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}
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/**
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* Include htmlfilter class
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*/
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include_once('lib/htmlfilter.php');
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/**
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* Provide all MIME functionality
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*/
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/**
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* Get full MIME type
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* $param The mime structure object
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*/
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function GetCtype($struct) {
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$ctype_p = strtolower(trim($struct->ctype_primary));
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$ctype_s = strtolower(trim($struct->ctype_secondary));
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$type = $ctype_p . '/' . $ctype_s;
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return $type;
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}
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/**
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* Recursively parse MIME structure
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* $param The mime structure object
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*/
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$filelist = array ();
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$errors = array ();
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function MsgParseBody($struct) {
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global $filelist;
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global $errors;
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$ctype_p = strtolower(trim($struct->ctype_primary));
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$ctype_s = strtolower(trim($struct->ctype_secondary));
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switch ($ctype_p) {
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case "multipart":
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switch ($ctype_s) {
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case "alternative":
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// Handle multipart/alternative parts
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$alt_entity = FindMultiAlt($struct->parts);
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// Ignore if we return false NEEDS WORK
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if ($alt_entity) MsgParseBody($alt_entity);
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break;
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case "related":
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// Handle multipart/related parts
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$rel_entities = FindMultiRel($struct);
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foreach ($rel_entities as $ent) {
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MsgParseBody($ent);
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}
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break;
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default:
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// Probably multipart/mixed here
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// Recursively process nested mime entities
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if ( is_array($struct->parts) || is_object($struct->parts) ) {
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foreach ($struct->parts as $cur_part) {
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MsgParseBody($cur_part);
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}
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} else {
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$errors['Invalid or Corrupt MIME Detected.'] = true;
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}
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break;
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}
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break;
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case "text":
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// Do not display attached text types
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if ($attachment = $struct->d_parameters['filename'] or
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$attachment = $struct->d_parameters['name']) {
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array_push($filelist, $attachment);
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break;
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}
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switch ($ctype_s) {
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// Plain text
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case "plain":
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MsgBodyPlainText($struct->body);
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break;
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// HTML text
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case "html":
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MsgBodyHtmlText($struct->body);
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break;
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// Text type we do not support
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default:
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$errors['Portions of text could not be displayed'] = true;
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}
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break;
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default:
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// Save the listed filename or notify the
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// reader that this mail is not displayed completely
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$attachment = $struct->d_parameters['filename'];
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$attachment ? array_push($filelist, $attachment) : $errors['Unsupported MIME objects present'] = true;
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}
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}
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/**
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* Get the best MIME entity for multipart/alternative
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* Adapted from SqurrelMail
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* $param Array of MIME entities
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* $return Single MIME entity
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*/
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function FindMultiAlt($parts) {
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$alt_pref = array ('text/plain', 'text/html');
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$best_view = 0;
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// Bad Headers sometimes have invalid MIME....
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if ( is_array($parts) || is_object($parts) ) {
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foreach ($parts as $cur_part) {
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$type = GetCtype($cur_part);
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if ($type == 'multipart/related') {
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$type = $cur_part->d_parameters['type'];
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// Mozilla bug. Mozilla does not provide the parameter type.
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if (!$type) $type = 'text/html';
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}
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$altCount = count($alt_pref);
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for ($j = $best_view; $j < $altCount; ++$j) {
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if (($alt_pref[$j] == $type) && ($j >= $best_view)) {
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$best_view = $j;
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$struct = $cur_part;
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}
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}
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}
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return $struct;
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} else {
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$errors['Invalid or Corrupt MIME Detected.'] = true;
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}
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}
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/**
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* Get the list of related entities for multipart/related
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* Adapted from SqurrelMail
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* $param multipart/alternative structure
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* @return List of MIME entities
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*/
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function FindMultiRel($struct) {
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$entities = array();
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$type = $struct->d_parameters['type'];
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// Mozilla bug. Mozilla does not provide the parameter type.
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if (!$type) $type = 'text/html';
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// Bad Headers sometimes have invalid MIME....
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if ( is_array($struct->parts) || is_object($struct->parts) ) {
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foreach ($struct->parts as $part) {
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if (GetCtype($part) == $type || GetCtype($part) == "multipart/alternative") {
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array_push($entities,$part);
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}
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}
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} else {
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$errors['Invalid or Corrupt MIME Detected.'] = true;
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}
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return $entities;
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}
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// Wrapper script for htmlfilter. Settings taken
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// from SquirrelMail
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function sanitizeHTML($body) {
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if (isset($_COOKIE['lang']) &&
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file_exists("img/".substr($_COOKIE['lang'],0,2).".blocked_img.png")) {
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$secremoveimg = "img/".substr($_COOKIE['lang'],0,2).".blocked_img.png";
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} else {
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$secremoveimg = "img/blocked_img.png";
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}
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$tag_list = Array(
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false,
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"object",
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"meta",
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"html",
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"head",
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"base",
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"link",
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"frame",
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"iframe",
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"plaintext",
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"marquee"
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);
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$rm_tags_with_content = Array(
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"script",
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"applet",
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"embed",
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"title",
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"frameset",
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"xml",
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"style"
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);
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$self_closing_tags = Array(
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"img",
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"br",
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"hr",
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"input"
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);
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$force_tag_closing = true;
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$rm_attnames = Array(
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"/.*/" =>
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Array(
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"/target/i",
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"/^on.*/i",
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"/^dynsrc/i",
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"/^data.*/i",
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"/^lowsrc.*/i"
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)
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);
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$bad_attvals = Array(
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"/.*/" =>
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Array(
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"/^src|background/i" =>
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Array(
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Array(
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"/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
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"/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
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"/^([\'\"])\s*about\s*:.*([\'\"])/si",
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"/^([\'\"])\s*https*:.*([\'\"])/si",
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"/^([\'\"])\s*cid*:.*([\'\"])/si"
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),
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Array(
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"\\1$secremoveimg\\2",
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"\\1$secremoveimg\\2",
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"\\1$secremoveimg\\2",
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"\\1$secremoveimg\\2",
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"\\1$secremoveimg\\2"
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)
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),
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"/^href|action/i" =>
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Array(
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Array(
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"/^([\'\"])\s*\S+script\s*:.*([\'\"])/si",
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"/^([\'\"])\s*mocha\s*:*.*([\'\"])/si",
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"/^([\'\"])\s*about\s*:.*([\'\"])/si"
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),
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Array(
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"\\1#\\1",
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"\\1#\\1",
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"\\1#\\1",
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"\\1#\\1"
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)
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),
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"/^style/i" =>
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Array(
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Array(
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"/expression/i",
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"/binding/i",
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"/behaviou*r/i",
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"/include-source/i",
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"/url\s*\(\s*([\'\"])\s*\S+script\s*:.*([\'\"])\s*\)/si",
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"/url\s*\(\s*([\'\"])\s*mocha\s*:.*([\'\"])\s*\)/si",
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"/url\s*\(\s*([\'\"])\s*about\s*:.*([\'\"])\s*\)/si",
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"/(.*)\s*:\s*url\s*\(\s*([\'\"]*)\s*\S+script\s*:.*([\'\"]*)\s*\)/si",
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"/url\(([\'\"])\s*https*:.*([\'\"])\)/si"
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),
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Array(
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"idiocy",
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"idiocy",
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"idiocy",
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"idiocy",
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"url(\\1#\\1)",
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"url(\\1#\\1)",
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"url(\\1#\\1)",
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"url(\\1#\\1)",
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"url(\\1#\\1)",
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"\\1:url(\\2#\\3)",
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"url(\\1$secremoveimg\\1)"
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)
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)
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)
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);
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$add_attr_to_tag = Array(
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"/^a$/i" =>
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Array('target'=>'"_new"'
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)
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);
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$trusted_html = sanitize($body,
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$tag_list,
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$rm_tags_with_content,
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$self_closing_tags,
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$force_tag_closing,
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$rm_attnames,
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$bad_attvals,
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$add_attr_to_tag
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);
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return $trusted_html;
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}
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