Date: Fri, 10 Feb 2017 18:13:35 -0500 From: Jon Radel <jon@radel.com> To: Doug Niven <dniven@ucsc.edu>, freebsd-questions@freebsd.org Subject: Re: PF question Message-ID: <4e2d0f1d-5904-1a14-0bcc-0ed3ce39a716@radel.com> In-Reply-To: <CAFcpV2Pfv%2BBOhMR3keWj9P1tPfDC8OxeGghHvyDeHN2O8-8NVg@mail.gmail.com> References: <CAFcpV2Pfv%2BBOhMR3keWj9P1tPfDC8OxeGghHvyDeHN2O8-8NVg@mail.gmail.com>
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On 2/10/17 5:50 PM, Doug Niven wrote:
> The following PF rule successfully blocks out "off campus" traffic to
> port 22, but it only blocks it if the interface name is "en0"
?? OK, one of us is a bit confused--might be me though.
That should already block all inbound traffic to port 22 on any
interface with a single exception: The only traffic that is *allowed*
is that arriving on en0 from an address in <friendlies> to an interface
address on en0.
Are you actually seeing allowed traffic on other interfaces port 22?
>=20
> How can I tweak this so it will block out port 22 for ANY/ALL
> interfaces on the host, even if I don't know their names?
Like this:
block in proto tcp from any to any port {22}
If you don't specify one or more interfaces it applies to all
interfaces, which why PF rulesets generally a pretty permissive rule
somewhere for loopback interface(s); all sorts of things break if you
filter your loopback interface(s)....
>=20
>=20
> table <friendlies> { 111.222.0/16, 222.333.0.0/16 } persist
> block in proto tcp from any to any port {22}
> pass in on en0 proto tcp from <friendlies> to (en0) port {22}
> flags S/SA keep state
Or are you asking how to selectively *allow* inbound ssh traffic to
interfaces other than en0?
--=20
--Jon Radel
jon@radel.com
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