I've recently had to leave my firewall off on my test server because when I'm
ssh-ed in and enable pf, I get "locked out". :( It was working fine before and
the only change that's happened recently is our university has a new ip range,
but I've changed that in my config. I also have a production FreeBSD server of
which I can ssh to (thankfully) with pf enabled and it's pf.conf is virtually
the same.
My pf config relevant to this is:
#### LISTS/MACROS:
ext_if = "bce0"
#### TABLES:
table <campusaccess> const { campus ip range omitted }
#### OPTIONS:
set skip on lo0
#### NORMALIZATION:
scrub in all
#### FILTERING:
# default deny everything in and log
block in log on $ext_if all
block out log on $ext_if all
# activate spoofing
antispoof log quick for $ext_if inet
# ssh for <campusaccess>
pass in on $ext_if proto tcp from <campusaccess> to $ext_if port 22 flags
S/SA keep state
(other rules for other services/ports that are working go here)
# let stuff out
pass out on $ext_if proto { tcp, udp } from any to any keep state
/var/log/messages shows entries like:
Sep 2 10:02:27 myserver sshd[21000]: fatal: Write failed: Operation not
permitted
tcpdump -n -e -ttt -r /var/log/pflog shows entries like:
32. 022410 rule 0/0(match): block in on bce0: mymacip.50186 > myserverip.22:
P 1:97(96) ack 0 win 65535 <nop,nop,timestamp 32900581 4199243883>
and:
2143. 098222 rule 1/0(match): block out on bce0: myserverip.22 >
mymacip.50542: P 3200122721 :3200122817(96) ack 2819997173 win 8326
<nop,nop,timestamp 3729475032 32922638>
My Mac is within the <campusaccess> defined in my tables section. Only ssh is
being blocked. Other things like port 80 for apache, port 3306 for MySQL, port
8080 for Plone, etc. are all fine.
I have searched the freebsd-pf list archives, but it only allows me one page of
search results for some reason. I have also Googled a bit and have finally
posted here. Very confused.
Gavin Spomer
Systems Programmer
Brooks Library
Central Washington University
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