Re: [tor-dev] yes hello, internet supervillain here

[Mansour Moufid <mansourmoufid@xxxxxxxxx>]

On Sat, 08 Nov 2014 22:10:23 +0000
Fears No One <nachash@xxxxxxxxxxxxx> wrote:

> BEGIN TINFOIL
> 
> Upon scrolling through the .xz files (I personally use xzless), you'll
> find a bunch of stuff like:
> 
>       1
> /%5C%22http://www.hackforums.net/code/fail/code/code/code/code/code/
> ...
> 
> All of the requests were around (If I recall correctly) 3KB in size.
> Oddly enough, it caused tor to hiccup pretty badly, although the web
> server itself was just fine and I didn't have any network bandwidth
> problems (i.e. No obscene traffic spikes). It's also worth pointing out
> that the tcp buffers weren't even close to maxed. The same box has
> handled a similar volume of legitimate requests before (Namely back in
> March, after The Hidden Wiki debacle; see
> https://twitter.com/loldoxbin/status/530765088366821377). The solution
> to getting tor availability back was to set ConstrainedSockets to 1 and
> play with  ConstrainedSockSize (Originally set to 8192, then 4096). This
> made doxbin regularly available again, whereas before it was hit or
> miss. Once the requests stopped, I waited a couple of days before
> commenting those two config lines out and reloaded tor.
> 
> A month later, the same kinds of requests started coming in again. After
> the first few hours, I started 301 redirecting all requests containing
> /%5C%22 to the new Hidden Wiki's Hard Candy page. I also added a grep -v
> to my log report script in order to filter out the noise (Possibly a
> mistake, but we both tailed logs and watched for something like a
> different attack style that the ddos was being used to cover and never
> noticed anything). That was good enough to maintain availability, so I
> rolled with it and the requests eventually stopped. I have no hard data
> on that last point, just the fact that I tailed the access log and the
> requests went from 5 per second to 1 every 3-6 seconds before dying off
> completely.

Do you have more detailed logs? I'm specifically interested in the
timing data of these requests (like the logs web servers keep for
"analytics").

The HS may have been subject to a traffic confirmation attack (aka
cross-correlation attack) and the timing data could disprove this.


Mansour
_______________________________________________
tor-dev mailing list
tor-dev@xxxxxxxxxxxxxxxxxxxx
https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-dev