Block file extension from download

Discussion in 'Tomato Firmware' started by eahm, Oct 15, 2013.

  1. eahm

    eahm LI Guru Member

    I need a way to block ANY file extension from being downloaded, employees of customers' companies don't listen, I need a way to block this from its source, from the router.

    .exe, .msi are preferrable but I would like to block any extension, even .zip etc.

    Is there a way?

  2. kbenoit

    kbenoit Reformed Router Member

    You should look into squid. There's a package in optware. Another way would be to get packets in userspace with iptables and code a filter.
  3. Victek

    Victek Network Guru Member

    Use NGINX as a web proxy.. it's included in my version, code...

    location ~* (|\.exe|\.js|\.zip|\.msi)$ {
        valid_referers blocked;
        if ($invalid_referer) {
            return 444;
  4. jerrm

    jerrm Network Guru Member

    The web module for iptables should be pretty effective. Create a gui rule to block activex/java/flash and use that as a template and add in whatever extensions you want. It should be something like (but create a gui rule to double check the syntax!):
    iptables -I wanout -p tcp  --dport 80 -m web --path ".swf$ .jar$" -j REJECT  --reject-with tcp-reset
    You can then copy that rule and add in whatever extensions you want.

    Nothing is 100% though. This likely will not block files served up as response to a query string or anything ssl. A proxy solution also looking at mime types would be best. Neither will do any good if files are served via https/ssl.
    Last edited: Oct 16, 2013
  5. Almaz

    Almaz Networkin' Nut Member

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