Skip site navigation (1)Skip section navigation (2)
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>

next in thread | previous in thread | raw e-mail | index | archive | help
This is a cryptographically signed message in MIME format.

--------------ms010803060600040605080901
Content-Type: text/plain; charset=windows-1252
Content-Transfer-Encoding: quoted-printable

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


--------------ms010803060600040605080901
Content-Type: application/pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
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--------------ms010803060600040605080901--



Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4e2d0f1d-5904-1a14-0bcc-0ed3ce39a716>