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Implement a common_purify for htmLawed and more

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We're removing unicode formatting characters as well, such as RTL marks.
For more info on why we're because extra cautious (but may accept the
characters in later versions) you can read:
https://blog.malwarebytes.org/online-security/2014/01/the-rtlo-method/
This commit is contained in:
Mikael Nordfeldth 2015-02-18 00:10:31 +01:00
parent 9aa59c7f62
commit 3dce6d9f6a
1 changed files with 29 additions and 9 deletions
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38
lib/util.php
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@ -576,6 +576,25 @@ function common_canonical_email($email)
return $email;
}
function common_purify($html)
{
require_once INSTALLDIR.'/extlib/htmLawed/htmLawed.php';
$config = array('safe' => 1,
'deny_attribute' => 'id,style,on*');
$html = common_remove_unicode_formatting($html);
return htmLawed($html, $config);
}
function common_remove_unicode_formatting($text)
{
// Strip Unicode text formatting/direction codes
// this is pretty dangerous for visualisation of text and can be used for mischief
return preg_replace('/[\\x{200b}-\\x{200f}\\x{202a}-\\x{202e}]/u', '', $text);
}
/**
* Partial notice markup rendering step: build links to !group references.
*
@ -585,9 +604,9 @@ function common_canonical_email($email)
*/
function common_render_content($text, Notice $notice)
{
$r = common_render_text($text);
$r = common_linkify_mentions($r, $notice);
return $r;
$text = common_render_text($text);
$text = common_linkify_mentions($text, $notice);
return $text;
}
/**
@ -829,14 +848,15 @@ function common_find_mentions_raw($text)
function common_render_text($text)
{
$r = nl2br(htmlspecialchars($text));
$text = common_remove_unicode_formatting($text);
$text = nl2br(htmlspecialchars($text));
$r = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $r);
$r = common_replace_urls_callback($r, 'common_linkify');
$r = preg_replace_callback('/(^|\&quot\;|\'|\(|\[|\{|\s+)#([\pL\pN_\-\.]{1,64})/u',
function ($m) { return "{$m[1]}#".common_tag_link($m[2]); }, $r);
$text = preg_replace('/[\x{0}-\x{8}\x{b}-\x{c}\x{e}-\x{19}]/', '', $text);
$text = common_replace_urls_callback($text, 'common_linkify');
$text = preg_replace_callback('/(^|\&quot\;|\'|\(|\[|\{|\s+)#([\pL\pN_\-\.]{1,64})/u',
function ($m) { return "{$m[1]}#".common_tag_link($m[2]); }, $text);
// XXX: machine tags
return $r;
return $text;
}
/**