Re: Server Attack

Chris Largret
2006-08-28T00:11:29Z

I'm going to go ahead and top-post on this (sorry). There has to be a limited number of computers these requests are coming from since the requests are coming over TCP. I'd write a quick script to grab the ip addresses and block them at the firewall level. Maybe something like this:

tail -f /var/log/apache/access_log|grep AppleWebKit|cut '-d ' -f 1|xargs /sbin/iptables -A INPUT -p tcp -j DROP -s

I haven't tested it (don't have a problem on my current server), but it _should_ follow the Apache requests, grab the IP addresses of users with a UserAgent of AppleWebKit and drop all TCP packets from the IP address until you reset your firewall.

~ Chris Largret

On Sun, 27 Aug 2006 14:58:37 -0700 (PDT)
altendew <andrew@shiftcode.com> wrote:

>
> Hi someone is currently sending requests to our server 20x a second.
>
> Here is what one of the logs look like.
>
> [CODE]
> Host: 84.77.19.46 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; MTQ; PPC Mac OS X; en-US) AppleWebKit/578.4
> (KHTML, like Geco, Safari) OmniWeb/v643.68e=C:
>
> Host: 82.234.98.65 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; CDB; PPC Mac OS X; en-US) AppleWebKit/126.0
> (KHTML, like Geco, Safari) OmniWeb/v554.35
>
> Host: 84.94.31.161 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; TLD; PPC Mac OS X; en-US) AppleWebKit/502.6
> (KHTML, like Geco, Safari) OmniWeb/v401.63ive=C:
>
> Host: 81.49.24.92 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; SZS; PPC Mac OS X; en-US) AppleWebKit/230.1
> (KHTML, like Geco, Safari) OmniWeb/v710.56ive=C:
>
> Host: 80.129.248.17 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; OST; PPC Mac OS X; en-US) AppleWebKit/243.6
> (KHTML, like Geco, Safari) OmniWeb/v846.88
>
> Host: 87.235.49.194 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.1 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; SDD; PPC Mac OS X; en-US) AppleWebKit/430.1
> (KHTML, like Geco, Safari) OmniWeb/v145.34
>
> Host: 125.129.12.61 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; WCG; PPC Mac OS X; en-US) AppleWebKit/455.3
> (KHTML, like Geco, Safari) OmniWeb/v042.84stemDrive=\x81
>
> Host: 66.110.153.47 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; ZAM; PPC Mac OS X; en-US) AppleWebKit/387.2
> (KHTML, like Geco, Safari) OmniWeb/v456.02ve=C:
>
> Host: 62.2.177.250 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:38 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; LMZ; PPC Mac OS X; en-US) AppleWebKit/206.1
> (KHTML, like Geco, Safari) OmniWeb/v204.07es
>
> Host: 200.115.226.143 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.1 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; EDE; PPC Mac OS X; en-US) AppleWebKit/647.0
> (KHTML, like Geco, Safari) OmniWeb/v760.47emDrive=C:\x81
>
> Host: 84.171.125.189 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; QHA; PPC Mac OS X; en-US) AppleWebKit/778.0
> (KHTML, like Geco, Safari) OmniWeb/v456.03=C:
>
> Host: 83.242.79.70 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; GFS; PPC Mac OS X; en-US) AppleWebKit/537.0
> (KHTML, like Geco, Safari) OmniWeb/v313.01rive=C:
>
> Host: 86.69.194.172 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; ZCV; PPC Mac OS X; en-US) AppleWebKit/468.2
> (KHTML, like Geco, Safari) OmniWeb/v026.14stemDrive=\x81
>
> Host: 196.203.176.26 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.1 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; BXT; PPC Mac OS X; en-US) AppleWebKit/840.3
> (KHTML, like Geco, Safari) OmniWeb/v767.50s
>
> Host: 201.41.241.190 /signUp.php?ref=1945777
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.0 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0 (Macintosh; TYZ; PPC Mac OS X; en-US) AppleWebKit/742.0
> (KHTML, like Geco, Safari) OmniWeb/v715.65C:
>
> Host: 200.84.144.234 /signUp.php?ref=ec0lag
> Http Code: 403 Date: Aug 27 17:44:37 Http Version: HTTP/1.1 Size in
> Bytes: -
> Referer: -
> Agent: Mozilla/5.0
> [/CODE]
>
> We are currently blocking this user through our Apache.
>
> .htaccess
> [CODE]
> RewriteEngine On
> RewriteCond %{HTTP_USER_AGENT} ^Mozilla/5\.0\ \(Macintosh;\ (.+)\ PPC\ Mac\
> OS\ X;\ en-US\)\ AppleWebKit/(.+)\ \(KHTML,\ like\ Geco,\ Safari\)\
> OmniWeb/v([0-9]+).([0-9]+)(.+)$
> RewriteRule .* - [F]
> [/CODE]
>
> That works fine and is giving the user a 403 (Forbidden), but the problem is
> that half of our Apache processes are from this user.
>
> Is there a way to block his user agent before he gets to Apache? Sometimes
> this brings our server to a crash.
>
> Thanks
> Andrew
> --
> View this message in context: http://www.nabble.com/Server-Attack-tf2174025.html#a6011508
> Sent from the linux-kernel forum at Nabble.com.
>
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/

--
Chris Largret <http://www.largret.com>