NAME
fiaif - FIAIF is an Intelligent Firewall.
SYNOPSIS
fiaif <start|stop|restart|force-reload|status|panic|tc-start|tc-
stop|tc-status>
DESCRIPTION
Fiaif deploys a packet-filtering firewall by reading configuration
files and setting up IP packet filtering rules using iptables. The
firewall is "zone" based, meaning that each network interface is
associated with a defined piece of the "IP universe" on the other side
of that interface from the host. A zone is defined in a text file (the
zone configuration file) listing rules for the handling of IP traffic
into, out of, and through the associated interface. The rules spell
out which connections to accept, which to reject, which to ignore, and
which to forward through the firewall. It is also possible to setup
source and destination NAT for altering the source and/or destination
addresses of packets as they pass through. All non-accepted packets
are logged to the system log.
It should be noted that any packet related to an already accepted
connection is allowed though the firewall.
OPTIONS
start This will save the current state of netfilter, and apply the new
firewall as described in the configuration files.
stop Restores the state saved when FIAIF was started.
restart
Same as stop,start
force-reload
This option is the same as start, although it does not use any
previously saved rules, and can be used even if fiaif has
already been started.
start-tc
Start/restart only traffic shaping. Useful if you are playing
arround with that part of the fiaf subsystem.
panic Shut off all IP traffic - don’t accept any packets from anywhere
for any reason. This can be used, for example, if uninvited
guests are discovered on the system to quickly close the
firewall and start analyzing log files.
status Lists all rules in the firewall.
test Instead of deploying the firewall, all rules are written to the
file specified in the "TEST_FILE" parameter in the global
configuration file. This command also runs a sanity check on the
networking configuration. Any problems or warnings arising from
this check are printed to STDERR. Refer to
http://www.linuxhq.com/kernel/v2.4/doc/networking/ip-
sysctl.txt.html for details on settings tested. When deployed,
FIAIF can automatically fix the warnings and/or errors
displayed. Please see fiaif.conf(8) for more information.
tc-start
Start only traffic shaping. This option ignores the "ENABLE_TC"
parameter in the global configuration file.
tc-stop
Stops the traffic shaping. This option ignores the "ENABLE_TC"
parameter in the global configuration file.
tc-status
Lists packet counters for all traffic classes.
FILES
/etc/fiaif/fiaif.conf
The global configuration file. See fiaif.conf(8) for further
details.
/var/lib/fiaif/fiaif
file containing rules generated by fiaif.
/var/lib/fiaif/iptables
previous netfilter state
/var/lib/fiaif/sysctl
previous state of /proc before fiaif was started.
/var/log/messages
All illegal packets are logged to this file though syslog(3)
DIAGNOSTICS
Errors are logged to STDOUT. If any errors is printed, then please
recheck your configuration files.
ENVIRONMENT
If the NO_CLEANUP variable is set to a non-empty value, then rules are
not cleaned up after FIAIF is started. This will speed up FIAIF startup
time, but at the cost of having lots of rules and performance may (on
small systems with many zones) be affected. On a three zone system
FIAIF generated in total 310 rules. After cleaning up the rules, the
number of rules was down to 241. A reduction of 22%.
The FIAIF_CONF can be used to specify an anternative global
configurationfile, rather than using the default /etc/fiaif/fiaif.conf.
This can be used to ease switching between two different firewall
configurations.
BUGS
The test command line option is no guarantee that the firewall will
perform as expected, only that the syntax is correct. Only limited
semantic checks of rulesis performed.
REPORTING BUGS
Report bugs to <fiaif@fiaif.net>.
AUTHOR
Anders Fugmann <anders(at)fugmann.net>
SEE ALSO
fiaif.conf(8), zone.conf(8), iptables(8), syslog(3)