On 11/23/06, Max Laier <[EMAIL PROTECTED]> wrote:
> On 11/23/06, Jon Simola <[EMAIL PROTECTED]> wrote:
> > > Greetings BPF gurus!
> >
> > PF? bpf is different and has little to do with firewalling.
> >
> > > Could someone please give me full example to setup
> > > limit {src-addr | src-port | dst-addr | dst-port} to do what IPFW
> > > 01000 allow tcp from any to me setup limit src-addr 5 currently
> > > does
> >
> > I use something like this:
> >
> > pass in on $ext_if proto tcp from any to $ext_if port smtp flags S/SA
> > keep state (source-track rule, mac-src-states 5)
> >
> > --
>
> Greetings Jon,
>
> Could you please post your pf.conf with the rules so I can use it as a
> guide?
If you are looking for a guide - I suggest reading the pf-faq on the
OpenBSD site or Peter's great tutorial, available from:
http://home.nuug.no/~peter/pf/ The topic in question, is discussed here:
http://home.nuug.no/~peter/pf/en/bruteforce.html
--
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Thank you Max, and Jon for your kind prompts to help me to sort this problem.
PF is very powerful, again thanks for porting it to FreeBSD. :)
I checked http://home.nuug.no/~peter/pf/en/bruteforce.html
I still didn't find something in the faq covers table <bruteforce> persist , do
I need to create a file like /etc/bruteforce or no need for that and will be stored
in kernel until they expire or I reboot the box?
Here is my pf.conf
# Macros: define common values, so they can be referenced and changed easily.
ext_if="fxp0" # replace with actual external interface name i.e., dc0
int_if="fxp0" # replace with actual internal interface name i.e., dc1
tcp_services="{ 22, 25, 26, 53, 80, 110, 143, 443, 465, 783, 953, 993, 995, 3306,
59999 }"
udp_services="{ 53, 514 }"
icmp_types="8"
# Tables: similar to macros, but more flexible for many addresses.
table <foo> persist
# Options: tune the behavior of pf, default values are given.
set timeout { interval 10, frag 30 }
set timeout { tcp.first 120, tcp.opening 30, tcp.established 86400 }
set timeout { tcp.closing 900, tcp.finwait 45, tcp.closed 90 }
set timeout { udp.first 60, udp.single 30, udp.multiple 60 }
set timeout { icmp.first 20, icmp.error 10 }
set timeout { other.first 60, other.single 30, other.multiple 60 }
set timeout { adaptive.start 0, adaptive.end 0 }
set limit { states 10000, frags 5000 }
set loginterface $ext_if
set optimization normal
set block-policy drop
#set require-order yes
#set fingerprints "/etc/pf.os"
#scrub in all
scrub in on $ext_if all fragment reassemble min-ttl 15 max-mss 1400
scrub in on $ext_if all no-df
scrub on $ext_if all reassemble tcp
# Filtering: the implicit first two rules are
pass in all
pass out all
# Pass all 'quick' on localhost loopback device
pass quick on lo0 all
## Default DENY & Log filter rules
block in log all
block out log all
# Drop our 'foo' 'quick' with no reply or logging.
block in quick on $ext_if from <foo> to any
# Drop our rfc1918 ranges
#block in quick on $ext_if from <rfc1918> to any
# Pass in rules for Various services defined above. Using 'synproxy-state' for
# basic dDoS mitigation on TCP services.
pass in on $ext_if proto tcp from any to $ext_if port $tcp_services flags S/SA
synproxy state
pass inet proto tcp from any to any port 80 \
flags S/SA keep state \
(max-src-conn-rate 4/50, \
overload <foo> flush global)
# Pass UDP keeping state
pass in on $ext_if proto udp from any to $ext_if port $udp_services keep state
# Pass ICMP Type 8 (echo-reply) only with state
pass in on $ext_if inet proto icmp all icmp-type $icmp_types keep state
# Pass FTP
pass in quick on $ext_if proto tcp from any to any port 21 flags S/SA keep
state
pass in quick on $ext_if proto tcp from any to any port > 49151 keep state
# Pass out rule allowing all with modulate state
pass out on $ext_if proto tcp all modulate state flags S/SA
# Pass out rules for UDP, ICMP
pass out on $ext_if proto { udp, icmp } all keep state
# End
Am I missing something?
as su I type pfctl -t foo -Tl -f /etc/pf.conf but it returns nothing.
I want to see the current IPs being blocked since I used overload <foo>
--
Regards,
-Abdullah
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