Date: Tue, 8 Feb 2011 17:06:49 -0500 From: Vadym Chepkov <vchepkov@gmail.com> To: Mike Tancsa <mike@sentex.net> Cc: freebsd-pf@freebsd.org Subject: Re: brutal SSH attacks Message-ID: <FFC11535-7638-4FE7-84EC-EED8D9A443BA@gmail.com> In-Reply-To: <4D51A061.20704@sentex.net> References: <D04005BA-E154-4AE3-B14B-F9E6EF1269B0@gmail.com> <4D51A061.20704@sentex.net>
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On Feb 8, 2011, at 2:58 PM, Mike Tancsa wrote:
> On 2/8/2011 1:11 PM, Vadym Chepkov wrote:
>> Hi,
>>=20
>> Could somebody help in figuring out why PF configuration meant to =
prevent brutal SSH attacks doesn't work.
>>=20
>> Here are the relevant parts:
>>=20
>> /etc/ssh/sshd_config
>>=20
>> PasswordAuthentication no
>> MaxAuthTries 1
>>=20
>> /etc/pf.conf
>>=20
>> block in log on $wan_if
>>=20
>> table <abusive_hosts> persist
>> block drop in quick from <abusive_hosts>
>>=20
>> pass quick proto tcp to $wan_if port ssh keep state \
>> (max-src-conn 10, max-src-conn-rate 9/60, overload <abusive_hosts> =
flush global)
>=20
>=20
> On RELENG_7 and 8 I use something like that. Is there a different IP
> they might be connecting to that is not covered under $wan_if?
>=20
That would mean this rule doesn't work:
block in log on $wan_if
>=20
>=20
> table <bruteforce> persist
> table <SSHTRUSTED> {xx.yy.zz.aa}
>=20
>=20
>=20
> block log all
> block in log quick proto tcp from <bruteforce> to any port 22
> pass in log quick proto tcp from {!<SSHTRUSTED>} to self port ssh \
> flags S/SA keep state \
> (max-src-conn 6, max-src-conn-rate 3/30, \
> overload <bruteforce> flush global)
> pass in log inet proto tcp from <SSHTRUSTED> to self port ssh keep =
state
>=20
I don't have "trusted" outside IPs, other then that your config seems =
the same, except mine suppose to be more strict - just one IP instead of =
"self".
By the way, wouldn't using "self" allow incoming packets to 127.0.0.1?
Vadym
>=20
>=20
> ---Mike
>=20
>=20
> --=20
> -------------------
> Mike Tancsa, tel +1 519 651 3400
> Sentex Communications, mike@sentex.net
> Providing Internet services since 1994 www.sentex.net
> Cambridge, Ontario Canada http://www.tancsa.com/
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