Re: [tor-relays] SSH scanning on TOR Exit - Nerfing Rules

[Matt Corallo <tor-lists@xxxxxxxxxxxxxxx>]

I've taken to contacting the sender of the automated abuse reports and
noting that sending such emails may actually not be legal (at least in
the US) under CAN-SPAM. In some cases I've seen positive response as
people aren't even aware their random server with fail2ban is sending
these things.

Matt

On 8/29/19 11:26 PM, AMuse wrote:
> Hi all! I'm curious what y'all think of this situation.
> 
> I have SSH open as an exit port on a TOR exit that my friends and I are
> maintaining - and of course it's the #1 offender by far in automated
> abuse notifications we get from our ISP, from peoples' fail2ban servers
> sending abuse emails. This all seems like a huge waste of time, but
> that's a separate issue.
> 
> I'm wondering if nerfing outbound SSH to rate limit will be effective at
> getting the SSH scanning bots to stop using my exit in their circuit,
> while leaving SSH open for actual humans who need to SSH while using TOR.
> 
> I've implemented, as a test, rate limiting outbound on the SSH port. 
> What do you think the impact of this will be?  No impact? Losing exit
> status because connections on SSH die?  Something else entirely?
> 
> Here's the pf rules in question:
> 
> pass in on $ext_if proto {tcp udp} from any to any port 9000:9150 keep state
> 
> pass in on $ext_if proto tcp from any to any port 22 keep state
> 
> pass in on $ext_if proto tcp from any to any port 80 keep state
> 
> pass out on $ext_if from any to any keep state
> 
> pass out on $ext_if proto tcp from any to any port 22 keep state
> (max-src-conn 25, max-src-conn-rate 1/5 )
> 
> 
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