diff options
Diffstat (limited to 'program/include')
| -rw-r--r-- | program/include/rcube_content_filter.php | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/program/include/rcube_content_filter.php b/program/include/rcube_content_filter.php new file mode 100644 index 000000000..430defec6 --- /dev/null +++ b/program/include/rcube_content_filter.php @@ -0,0 +1,55 @@ +<?php + +/* + +-----------------------------------------------------------------------+ + | program/include/rcube_content_filter.php | + | | + | This file is part of the Roundcube Webmail client | + | Copyright (C) 2011, The Roundcube Dev Team | + | Licensed under the GNU GPL | + | | + | PURPOSE: | + | PHP stream filter to detect evil content in mail attachments | + | | + +-----------------------------------------------------------------------+ + | Author: Thomas Bruederli <roundcube@gmail.com> | + +-----------------------------------------------------------------------+ + + $Id$ +*/ + +/** + * PHP stream filter to detect html/javascript code in attachments + */ +class rcube_content_filter extends php_user_filter +{ + private $buffer = ''; + private $cutoff = 2048; + + function onCreate() + { + $this->cutoff = rand(2048, 3027); + return true; + } + + function filter($in, $out, &$consumed, $closing) + { + while ($bucket = stream_bucket_make_writeable($in)) { + $this->buffer .= $bucket->data; + + // check for evil content and abort + if (preg_match('/<(script|iframe|object)/i', $this->buffer)) + return PSFS_ERR_FATAL; + + // keep buffer small enough + if (strlen($this->buffer) > 4096) + $this->buffer = substr($this->buffer, $this->cutoff); + + $consumed += $bucket->datalen; + stream_bucket_append($out, $bucket); + } + + return PSFS_PASS_ON; + } +} + |