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SURBL antispam support

Started by on Mar 14, 2005 – Contents updated: Mar 14, 2005

Mar 14, 2005 17:29    

Is there anyone working on SURBL support for antispam?

http://www.surbl.org/

I think it would scale alot better than the current blacklist method.

Viraj.

Mar 20, 2005 20:02

I've done a simple implementation of this by modifying _functions_antispam.php. In the antispam_url() function, right before the 'return false;', I added:


$url_parts = parse_url($url);
if (checkdnsrr("$url_parts[host].multi.surbl.org", 'A')) {
        return "SURBL";
}

Mar 20, 2005 20:23

I haven't had a chance to read all the docs on this. Is this all you need to do to implement it? How effective is it? Is there anyway to check the urls that are being filtered? (to check if it's filtering sites that I want to keep or not)

If it works, it could be rather useful.

Mar 20, 2005 21:31

Actually, I forgot that SURBL will only list the domains. So if domain.com is in SURBL, the above wouldn't detect www.domain.com. I made some changes to fix this as well as require that domains have MX records:


$parts = parse_url($url);
$host = $parts['host'];

# Find MX record to use for SURBL
$pieces = explode('.', $host);
$mx_found = 0;

for ($i = 2; $i <= count($pieces); $i++) {
        $possible_domain = implode('.', array_slice($pieces, -$i));
        if (!checkdnsrr($possible_domain, 'MX')) {
                continue;
        } else {
                $mx_found++;
                break;
        }
}

# Reject domains without MX
if (!$mx_found) {
        return "NOMX";
}

# Check SURBL
if (checkdnsrr("$possible_domain.multi.surbl.org", 'A')) {
        return "SURBL";
}

I think this should do it.

Mar 20, 2005 21:40

As far as the effectiveness of SURBL, it works fantastic for email. I've yet to determine how well it will for for blog spam, but it's likely that a blog spammer will be spamming with his/her domain via email as well.

SURBL lookups can be done [url=http://www.rulesemporium.com/cgi-bin/uribl.cgi]here[/url]. Perhaps a whitelist could be implemented if SURBL is used.


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