diff options
Diffstat (limited to 'program/include/main.inc')
| -rw-r--r-- | program/include/main.inc | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/program/include/main.inc b/program/include/main.inc index 8aa38c8d1..2d18567e7 100644 --- a/program/include/main.inc +++ b/program/include/main.inc @@ -883,19 +883,19 @@ function rcmail_get_edit_field($col, $value, $attrib, $type='text') * @param string Container ID to use as prefix * @return string Modified CSS source */ -function rcmail_mod_css_styles($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); + $evilexpr = 'expression|behavior' . (!$allow_remote ? '|url\(|import[^a]' : ''); + if (preg_match("/$evilexpr/i", $stripped) // don't accept No-Gos + || (strpos($stripped, 'url(') && !preg_match('!url\s*\([ "\'](https?:)//[a-z0-9/._+-]+["\' ]\)!Ui', $source))) // only allow clean urls 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, '}', $pos))) { @@ -937,7 +937,7 @@ function rcmail_xss_entity_decode($content) { $out = html_entity_decode(html_entity_decode($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; } |