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wswartzendruber
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PostPosted: Sun Aug 29, 2010 3:49 am    Post subject: About Those Occassional FGO DOS Attacks Reply with quote

Backstory

There's a group in the U.K. called Brandwatch that has the worst spider bot ever. It has been reported to send 178 simultaneous HTTP requests to a single host. This bot occassionally brings down FGO for periods of about five minutes.

Just Now

I took a visit to #gentoo-forums and asked desultory what was up. He told me about the spider, and about why hard-dropping their IP range in iptables may be a bad idea: They'll just flood us. I did some digging and found a post where someone reported the iptables trick to work.

So now he says it looks promising. :D

Now of course, I don't care about the rest of the forums, I just need constant 24/7 access to OTW! :lol:
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Bones McCracker
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PostPosted: Sun Aug 29, 2010 4:40 am    Post subject: Re: About Those Occassional FGO DOS Attacks Reply with quote

wswartzendruber wrote:
Backstory

There's a group in the U.K. called Brandwatch that has the worst spider bot ever. It has been reported to send 178 simultaneous HTTP requests to a single host. This bot occassionally brings down FGO for periods of about five minutes.

Just Now

I took a visit to #gentoo-forums and asked desultory what was up. He told me about the spider, and about why hard-dropping their IP range in iptables may be a bad idea: They'll just flood us. I did some digging and found a post where someone reported the iptables trick to work.

So now he says it looks promising. :D

Now of course, I don't care about the rest of the forums, I just need constant 24/7 access to OTW! :lol:


Wow. And to think that all this time I've been blaming ichbinsysphos or Naib for that, and was thinking I was the only one. :P

If this works, you should get like a little Gentoo Commendation Medal to put below your avatar.
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notageek
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PostPosted: Sun Aug 29, 2010 5:09 am    Post subject: Reply with quote

Fans of Obama in UK, what a surprise. :roll:
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Bones McCracker
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PostPosted: Sun Aug 29, 2010 5:49 am    Post subject: Reply with quote

notageek wrote:
Fans of Obama in UK, what a surprise. :roll:

:lol:
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ichbinsisyphos
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PostPosted: Sun Sep 05, 2010 7:54 pm    Post subject: FGO server problem? Reply with quote

Several times every day, the forum is not reachable for me. For a couple of minutes each time. Does this happen to anybody else or is it a problem with my provider?
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PostPosted: Sun Sep 05, 2010 7:55 pm    Post subject: Re: FGO server problem? Reply with quote

ichbinsisyphos wrote:
Several times every day, the forum is not reachable for me. For a couple of minutes each time. Does this happen to anybody else or is it a problem with my provider?


http://www.downornot.com/

Use that to check when you have issues. It's been down for me (and according to http://www.downornot.com/ everyone else too) on occasion... including about 2 minutes ago.
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ichbinsisyphos
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PostPosted: Sun Sep 05, 2010 8:02 pm    Post subject: Re: FGO server problem? Reply with quote

The Earth wrote:
... including about 2 minutes ago.
ok, seems to be a common problem then.
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Muso
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PostPosted: Sun Sep 05, 2010 8:13 pm    Post subject: Re: FGO server problem? Reply with quote

ichbinsisyphos wrote:
The Earth wrote:
... including about 2 minutes ago.
ok, seems to be a common problem then.


It seems to come in waves. A month of no problems, and then off and on for a few days.
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speeddemon
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PostPosted: Sun Sep 05, 2010 10:18 pm    Post subject: Reply with quote

Happens to me every so often too, I just dismissed it since nobody else had ever mentioned it. It will be unreachable for several minutes, then its fine.
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marens
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PostPosted: Sun Sep 05, 2010 10:39 pm    Post subject: Reply with quote

didn't wswartzendruber mention some evil crawler that "attacks" the forum?

edit:

RELEASE DEN KRAKEN :lol:
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skellr
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PostPosted: Sun Sep 05, 2010 11:41 pm    Post subject: Reply with quote

There is enough iptables kung fu around here...
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wswartzendruber
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PostPosted: Sun Sep 05, 2010 11:58 pm    Post subject: Reply with quote

This has been going on for a while.

EDIT: Click me.
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ichbinsisyphos
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PostPosted: Mon Sep 06, 2010 12:14 am    Post subject: Reply with quote

Y?

It doesn't look like the group has any harmful intentions. Why would the send so many requests that the server temporarily craps out?
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skellr
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PostPosted: Mon Sep 06, 2010 12:42 am    Post subject: Reply with quote

wswartzendruber wrote:
This has been going on for a while.

EDIT: Click me.


What can you expect from something in a gutter.
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Bones McCracker
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PostPosted: Mon Sep 06, 2010 1:11 am    Post subject: Reply with quote

marens wrote:
didn't wswartzendruber mention some evil crawler that "attacks" the forum?

edit:

RELEASE DEN KRAKEN :lol:

:lol:

It may be fairly trivial to blacklist the bot if it is using identifiable useragent(s), which many do.

Here's a good little how-to-ish article about doing that:
http://perishablepress.com/press/2009/03/29/4g-ultimate-user-agent-blacklist/
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wswartzendruber
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PostPosted: Mon Sep 06, 2010 2:45 am    Post subject: Reply with quote

desultory has just confirmed that he is adding their known IPs to a block list.
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Bones McCracker
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PostPosted: Mon Sep 06, 2010 3:12 am    Post subject: Reply with quote

wswartzendruber wrote:
desultory has just confirmed that he is adding their known IPs to a block list.

Maybe you could check to see if the user agent blacklisting (as mentioned in the link above) would work. It might be more thorough and more efficient.
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wswartzendruber
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PostPosted: Mon Sep 06, 2010 3:18 am    Post subject: Reply with quote

BoneKracker wrote:
wswartzendruber wrote:
desultory has just confirmed that he is adding their known IPs to a block list.

Maybe you could check to see if the user agent blacklisting (as mentioned in the link above) would work. It might be more thorough and more efficient.

Besides the lower overhead of just dropping all packets from a certain address, he seems to have a "Fuck the mother fuckers!" mentality.

EDIT: They're the only ones doing this.
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Bones McCracker
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PostPosted: Mon Sep 06, 2010 3:25 am    Post subject: Reply with quote

wswartzendruber wrote:
BoneKracker wrote:
wswartzendruber wrote:
desultory has just confirmed that he is adding their known IPs to a block list.

Maybe you could check to see if the user agent blacklisting (as mentioned in the link above) would work. It might be more thorough and more efficient.

Besides the lower overhead of just dropping all packets from a certain address, he seems to have a "Fuck the mother fuckers!" mentality.

EDIT: They're the only ones doing this.

If it's a just a bot coming from a limited number of addresses, and the addresses don't change, then I would agree.

If it's coming from a botnet, on the other hand, then it's likely the addresses will not remain constant, and dynamically blacklisting them will probably ultimately create a massive blacklist. Based on what you're saying, I'll assume this is not the case.
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wswartzendruber
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PostPosted: Mon Sep 06, 2010 3:42 am    Post subject: Reply with quote

BoneKracker wrote:
wswartzendruber wrote:
BoneKracker wrote:
wswartzendruber wrote:
desultory has just confirmed that he is adding their known IPs to a block list.

Maybe you could check to see if the user agent blacklisting (as mentioned in the link above) would work. It might be more thorough and more efficient.

Besides the lower overhead of just dropping all packets from a certain address, he seems to have a "Fuck the mother fuckers!" mentality.

EDIT: They're the only ones doing this.

If it's a just a bot coming from a limited number of addresses, and the addresses don't change, then I would agree.

If it's coming from a botnet, on the other hand, then it's likely the addresses will not remain constant, and dynamically blacklisting them will probably ultimately create a massive blacklist. Based on what you're saying, I'll assume this is not the case.

No, desultory has a relatively static set of addresses he's blocking.
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wswartzendruber
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PostPosted: Mon Sep 06, 2010 5:43 am    Post subject: Reply with quote

Quote:
<wswartz> BoneKracker's suggesting a user-agent based approach.
<desultory> we already have their ua on a steady diet of 403s.
<desultory> they're getting one last day (slight tweak being made) and if tthey still keep coming, it's iptable drop time.
<desultory> /tthey/they/
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Bones McCracker
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PostPosted: Mon Sep 06, 2010 6:30 am    Post subject: Reply with quote

wswartzendruber wrote:
Quote:
<wswartz> BoneKracker's suggesting a user-agent based approach.
<desultory> we already have their ua on a steady diet of 403s.
<desultory> they're getting one last day (slight tweak being made) and if tthey still keep coming, it's iptable drop time.
<desultory> /tthey/they/


Good. Thanks.
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tomk
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PostPosted: Mon Sep 06, 2010 9:16 am    Post subject: Reply with quote

Moved from Off the Wall to Gentoo Forums Feedback and merged from here.
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wswartzendruber
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PostPosted: Mon Sep 06, 2010 4:37 pm    Post subject: Reply with quote

tomk wrote:
Moved from Off the Wall to Gentoo Forums Feedback and merged from here.

Woohoo! postcount++; :D

Anyway, it looks like seeing FGO lockup one more time means they get IP banned. I should keep a steady stream of pings leaving just to be sure, and because I have nothing better to do today (besides discrete mathematics homework).
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Bones McCracker
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PostPosted: Tue Sep 07, 2010 3:12 am    Post subject: Reply with quote

Seems to be working so far. I haven't seen that behavior lately.
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