[Mimedefang] Filter specific .zip filenames

[Steven Rocha]

I realize this will probably not be a popular thing to do but it works.  We added zip extensions to the bad ext list and added this code to the filter() section to allow all zip extensions through except MyDoom/Novarg files.
 
if (filter_bad_filename($entity)) {
    if ($fname =~ /.zip/i) {
        if ($fname =~ /document|readme|doc|text|file|data|test|message|body/i) {
            md_log('bad_filename', $fname, $type);
            return action_quarantine($entity, "An attachment named $fname was removed from this document.\n");
        }
        return action_accept();
    }
    md_log('bad_filename', $fname, $type);
    return action_quarantine($entity, "An attachment named $fname was removed from this document.\n");
}
 
I realize it will allow files with .zip.scr through and I only added this as a temporary measure.  I don't have a virus scanner on this box and wanted do what I could to slow down this virus.
 
Feedback welcome on my 5min code.

Thanks,

Steve