/usr/share/roundcube/plugins/dkimstatus/dkimstatus.php is in roundcube-plugins-extra 0.7-20120110.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/**
* This plugin displays an icon showing the status
* of dkim verification of the message
*
* @version 0.4.7
* @author Julien vehent
* @mail julien@linuxwall.info
*
* original plugin from Vladimir Mach - wladik@gmail.com
* http://www.wladik.net
*
* Changelog:
* 20110912 - Added X-Spam-Status for spamassassin (thanks Ashish Shukla for the patch)
* 20110619 - Added License information for GPLv2
* 20110406 - added italian translation from Roberto Puzzanghera
* 20110128 - updated german translation by Simon
* 20101118 - japanese translation from Taka
* 20100811 - from Sergio Cambra: SPF fix, image function and spanish translation
* 20100202 - fix for amavis and add cz translation
* 20100201 - add control of header.i and header.from to detect third party signature, change icons
* 20100115 - add 'no information' status with image using x-dkim-authentication-results
* 20090920 - fixed space in matching status (thanks Pim Pronk for suggestion)
*/
class dkimstatus extends rcube_plugin
{
public $task = 'mail';
function init()
{
$rcmail = rcmail::get_instance();
if ($rcmail->action == 'show' || $rcmail->action == 'preview') {
$this->add_hook('imap_init', array($this, 'imap_init'));
$this->add_hook('message_headers_output', array($this, 'message_headers'));
} else if ($rcmail->action == '') {
// with enabled_caching we're fetching additional headers before show/preview
$this->add_hook('imap_init', array($this, 'imap_init'));
}
}
function imap_init($p)
{
$rcmail = rcmail::get_instance();
$p['fetch_headers'] = trim($p['fetch_headers'].' ' . strtoupper('Authentication-Results').' '. strtoupper('X-DKIM-Authentication-Results').' ' .strtoupper('X-Spam-Status'));
return $p;
}
function image($image, $alt, $title)
{
return '<img src="plugins/dkimstatus/images/'.$image.'" alt="'.$this->gettext($alt).'" title="'.$this->gettext($alt).$title.'" /> ';
}
function message_headers($p)
{
$this->add_texts('localization');
/* First, if dkimproxy did not find a signature, stop here
*/
if($p['headers']->others['x-dkim-authentication-results'] || $p['headers']->others['authentication-results'] || $p['headers']->others['x-spam-status']){
$results = $p['headers']->others['x-dkim-authentication-results'];
if(preg_match("/none/", $results)) {
$image = 'nosiginfo.png';
$alt = 'nosignature';
} else {
/* Second, check the authentication-results header
*/
if($p['headers']->others['authentication-results']) {
$results = $p['headers']->others['authentication-results'];
if(preg_match("/dkim=([a-zA-Z0-9]*)/", $results, $m)) {
$status = ($m[1]);
}
if(preg_match("/domainkeys=([a-zA-Z0-9]*)/", $results, $m)) {
$status = ($m[1]);
}
if($status == 'pass') {
/* Verify if its an author's domain signature or a third party
*/
if(preg_match("/[@][a-zA-Z0-9]+([.][a-zA-Z0-9]+)?\.[a-zA-Z]{2,4}/", $p['headers']->from, $m)) {
$authordomain = $m[0];
if(preg_match("/header\.i=(([a-zA-Z0-9]+[_\.\-]?)+)?($authordomain)/", $results) ||
preg_match("/header\.from=(([a-zA-Z0-9]+[_\.\-]?)+)?($authordomain)/", $results)) {
$image = 'authorsign.png';
$alt = 'verifiedsender';
$title = $results;
} else {
$image = 'thirdpty.png';
$alt = 'thirdpartysig';
$title = $results;
}
}
}
/* If signature proves invalid, show appropriate warning
*/
else if ($status) {
$image = 'invalidsig.png';
$alt = 'invalidsignature';
$title = $results;
}
/* If no status it can be a spf verification
*/
else {
$image = 'nosiginfo.png';
$alt = 'nosignature';
}
/* Third, check for spamassassin's X-Spam-Status
*/
} else if ($p['headers']->others['x-spam-status']) {
$image = 'nosiginfo.png';
$alt = 'nosignature';
/* DKIM_* are defined at: http://search.cpan.org/~kmcgrail/Mail-SpamAssassin-3.3.2/lib/Mail/SpamAssassin/Plugin/DKIM.pm */
$results = $p['headers']->others['x-spam-status'];
if(preg_match_all('/DKIM_[^,]+/', $results, $m)) {
if(array_search('DKIM_SIGNED', $m[0]) !== FALSE) {
if(array_search('DKIM_VALID', $m[0]) !== FALSE) {
if(array_search('DKIM_VALID_AU', $m[0])) {
$image = 'authorsign.png';
$alt = 'verifiedsender';
$title = 'DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU';
} else {
$image = 'thirdpty.png';
$alt = 'thirdpartysig';
$title = 'DKIM_SIGNED, DKIM_VALID';
}
} else {
$image = 'invalidsig.png';
$alt = 'invalidsignature';
$title = 'DKIM_SIGNED';
}
}
}
}
}
} else {
$image = 'nosiginfo.png';
$alt = 'nosignature';
}
if ($image && $alt) {
$p['output']['from']['value'] = $this->image($image, $alt, $title) . $p['output']['from']['value'];
}
return $p;
}
}
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