From e02694c3a6dbe753c5683d201b6b6b14c2b30660 Mon Sep 17 00:00:00 2001
From: thomascube <thomas@roundcube.net>
Date: Sat, 10 Dec 2011 09:16:31 -0500
Subject: [PATCH] Backported CSS sanitization (r5586:r5590)
---
program/include/main.inc | 77 +++++++++++++++++++++++++-------------
1 files changed, 50 insertions(+), 27 deletions(-)
diff --git a/program/include/main.inc b/program/include/main.inc
index 25940bd..d40dbda 100644
--- a/program/include/main.inc
+++ b/program/include/main.inc
@@ -640,20 +640,23 @@
function get_input_value($fname, $source, $allow_html=FALSE, $charset=NULL)
{
$value = NULL;
-
- if ($source==RCUBE_INPUT_GET && isset($_GET[$fname]))
- $value = $_GET[$fname];
- else if ($source==RCUBE_INPUT_POST && isset($_POST[$fname]))
- $value = $_POST[$fname];
- else if ($source==RCUBE_INPUT_GPC)
- {
+
+ if ($source == RCUBE_INPUT_GET) {
+ if (isset($_GET[$fname]))
+ $value = $_GET[$fname];
+ }
+ else if ($source == RCUBE_INPUT_POST) {
+ if (isset($_POST[$fname]))
+ $value = $_POST[$fname];
+ }
+ else if ($source == RCUBE_INPUT_GPC) {
if (isset($_POST[$fname]))
$value = $_POST[$fname];
else if (isset($_GET[$fname]))
$value = $_GET[$fname];
else if (isset($_COOKIE[$fname]))
$value = $_COOKIE[$fname];
- }
+ }
return parse_input_value($value, $allow_html, $charset);
}
@@ -661,7 +664,7 @@
/**
* Parse/validate input value. See get_input_value()
* Performs stripslashes() and charset conversion if necessary
- *
+ *
* @param string Input value
* @param boolean Allow HTML tags in field value
* @param string Charset to convert into
@@ -687,15 +690,21 @@
else if (get_magic_quotes_gpc() || get_magic_quotes_runtime())
$value = stripslashes($value);
- // remove HTML tags if not allowed
+ // remove HTML tags if not allowed
if (!$allow_html)
$value = strip_tags($value);
-
+
+ $output_charset = is_object($OUTPUT) ? $OUTPUT->get_charset() : null;
+
+ // remove invalid characters (#1488124)
+ if ($output_charset == 'UTF-8')
+ $value = rc_utf8_clean($value);
+
// convert to internal charset
- if (is_object($OUTPUT) && $charset)
- return rcube_charset_convert($value, $OUTPUT->get_charset(), $charset);
- else
- return $value;
+ if ($charset && $output_charset)
+ $value = rcube_charset_convert($value, $output_charset, $charset);
+
+ return $value;
}
/**
@@ -711,10 +720,10 @@
$src = $mode == RCUBE_INPUT_GET ? $_GET : ($mode == RCUBE_INPUT_POST ? $_POST : $_REQUEST);
foreach ($src as $key => $value) {
$fname = $key[0] == '_' ? substr($key, 1) : $key;
- if ($ignore && !preg_match("/($ignore)/", $fname))
+ if ($ignore && !preg_match('/^(' . $ignore . ')$/', $fname))
$out[$fname] = get_input_value($key, $mode);
}
-
+
return $out;
}
@@ -874,23 +883,37 @@
* @param string Container ID to use as prefix
* @return string Modified CSS source
*/
-function rcmail_mod_css_styles($source, $container_id)
+function rcmail_mod_css_styles($source, $container_id, $allow_remote=false)
{
$last_pos = 0;
$replacements = new rcube_string_replacer;
// ignore the whole block if evil styles are detected
- $stripped = preg_replace('/[^a-z\(:;]/', '', rcmail_xss_entity_decode($source));
- if (preg_match('/expression|behavior|url\(|import[^a]/', $stripped))
+ $source = rcmail_xss_entity_decode($source);
+ $stripped = preg_replace('/[^a-z\(:;]/i', '', $source);
+ $evilexpr = 'expression|behavior|javascript:|import[^a]' . (!$allow_remote ? '|url\(' : '');
+ if (preg_match("/$evilexpr/i", $stripped))
return '/* evil! */';
- // remove css comments (sometimes used for some ugly hacks)
- $source = preg_replace('!/\*(.+)\*/!Ums', '', $source);
-
// cut out all contents between { and }
- while (($pos = strpos($source, '{', $last_pos)) && ($pos2 = strpos($source, '}', $pos)))
- {
- $key = $replacements->add(substr($source, $pos+1, $pos2-($pos+1)));
+ while (($pos = strpos($source, '{', $last_pos)) && ($pos2 = strpos($source, '}', $pos))) {
+ $styles = substr($source, $pos+1, $pos2-($pos+1));
+
+ // check every line of a style block...
+ if ($allow_remote) {
+ $a_styles = preg_split('/;[\r\n]*/', $styles, -1, PREG_SPLIT_NO_EMPTY);
+ foreach ($a_styles as $line) {
+ $stripped = preg_replace('/[^a-z\(:;]/i', '', $line);
+ // ... and only allow strict url() values
+ if (stripos($stripped, 'url(') && !preg_match('!url\s*\([ "\'](https?:)//[a-z0-9/._+-]+["\' ]\)!Uims', $line)) {
+ $a_styles = array('/* evil! */');
+ break;
+ }
+ }
+ $styles = join(";\n", $a_styles);
+ }
+
+ $key = $replacements->add($styles);
$source = substr($source, 0, $pos+1) . $replacements->get_replacement($key) . substr($source, $pos2, strlen($source)-$pos2);
$last_pos = $pos+2;
}
@@ -928,7 +951,7 @@
{
$out = html_entity_decode(html_entity_decode($content));
$out = preg_replace_callback('/\\\([0-9a-f]{4})/i', 'rcmail_xss_entity_decode_callback', $out);
- $out = preg_replace('#/\*.*\*/#Um', '', $out);
+ $out = preg_replace('#/\*.*\*/#Ums', '', $out);
return $out;
}
--
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