Re: [OT] Re: Server Attack

altendew
2006-08-28T05:05:54Z

To be quite honest in the end this will keep adding IPs. This russian guy who
is DDOS me is sending 40 requests per second. The problem is all the IPs are
different and I dont feel safe rejected all the IPs. I looked up the IPs on
an IPWhois and most of the same they are a "Autonomous System" wtf is that?

This guy sends two different types of HTTP requests:
/signUp.php?ref=ec0lag
/signUp.php?ref=1945777

Hey man any help would be great.

Willy Tarreau-3 wrote:
>
> On Sun, Aug 27, 2006 at 09:38:44PM -0700, altendew wrote:
>>
>> This works!!
>>
>> tail -f /usr/local/apache/domlogs/leapcash.com|grep 'GET
>> /signUp.php?ref=ec0lag'|cut '-d ' -f 1|xargs -i /sbin/iptables -v -A
>> INPUT
>> -p tcp -j DROP -s {}
>>
>> Thanks man I fully understand this query now. You helped me understand
>> this
>> linux. I just looked up these commands and went along.
>
> If this '/signUp.php' request is invalid for your site, you might also
> want to use the string match from iptables to block it before it reaches
> your server (in combination with very short request timeouts).
>
> You should probably add the complementary rule in your OUTPUT string,
> matching the attacker with -d $ip and send them to the REJECT target to
> ensure that your apache server will have all its connections cleanly
> closed. Otherwise you may end up with hundreds/thousands of FIN_WAIT
> sockets monopolizing processes. Shortening request timeouts and disabling
> keepalive will help a lot too. I can also give you some tricks off-list
> for a more complex setup if you want.
>
> Good luck,
> Willy
>
>> altendew wrote:
>> >
>> > This does not spit anything out.
>> >
>> > I have changed it to this.
>> >
>> > tail -f /usr/local/apache/domlogs/leapcash.com|grep 'GET
>> > /signUp.php?ref=ec0lag'|cut '-d ' -f 1|xargs /sbin/iptables -A INPUT -p
>> > tcp -j DROP -s
>> >
>> > When I run this
>> >
>> > tail -f /usr/local/apache/domlogs/leapcash.com|grep 'GET
>> > /signUp.php?ref=ec0lag'|cut '-d ' -f 1
>> >
>> > it lists the IPs fine.. when I run
>> >
>> > tail -f /usr/local/apache/domlogs/leapcash.com|grep 'GET
>> > /signUp.php?ref=ec0lag'|cut '-d ' -f 1|xargs /sbin/iptables -A INPUT -p
>> > tcp -j DROP -s
>> >
>> > It doesnt spit out anything, how do I kno its working.
>> >
>> > Chris Largret wrote:
>> >>
>> >>
>> >> 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.
>> >>>
>> >>> -
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>> >>
>> >> --
>> >> Chris Largret <http://www.largret.com>
>> >> -
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>> >>
>> >
>> >
>>
>> --
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>> http://www.nabble.com/Server-Attack-tf2174025.html#a6014456
>> Sent from the linux-kernel forum at Nabble.com.
>>
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