Cleanning debian branch

This commit is contained in:
Jérôme Schneider 2013-11-09 10:49:32 +01:00
parent 11827cd6d1
commit 8e2e27f2b9
6 changed files with 2 additions and 440 deletions

View File

@ -1,18 +0,0 @@
##
## Makefile for firewall
##
## Made by jerome schneider Entr'ouvert
## Login <jschneider@entrouvert.org>
##
NAME = firewall
DESTDIR=
all:
install:
install -d -m 0755 -o root -g root $(DESTDIR)/etc/init.d $(DESTDIR)/etc/rsyslog.d
install -d -m 0755 -o root -g root $(DESTDIR)/etc/firewall
install -m 0640 -o root -g root $(NAME).conf $(DESTDIR)/etc/firewall/firewall.conf.template
install -m 0640 -o root -g root rsyslog.conf $(DESTDIR)/etc/rsyslog.d
install -m 0755 -o root -g root $(NAME) $(DESTDIR)/etc/init.d

16
README
View File

@ -1,16 +0,0 @@
= Installation =
* Requrie: rsyslog, logrotate and iptables
* make install
* Move /etc/firewall/firewall.conf.template to /etc/firewall/firewall.conf
* Configure /etc/firewall/firewall.conf
= Usage =
First launch test your configuration:
/etc/init.d/firewall test
Second save this change (this will load your rules and save it):
/etc/init.d/firewall save
You need to use save at least one time.
/etc/init.d/firewall stop: will flush ALL your rules
/etc/init.d/firewall start|restore: will load your saved rules

2
debian/rules vendored
View File

@ -12,3 +12,5 @@
%:
dh $@
override_dh_installinit:
dh_installinit --name=firewall

346
firewall
View File

@ -1,346 +0,0 @@
#!/bin/bash
### BEGIN INIT INFO
# Provides: firewall
# Required-Start: $remote_fs $syslog $network
# Required-Stop: $remote_fs $syslog $network
# Default-Start: 2 3 4 5
# Default-Stop: 0 1 6
# Short-Description: Iptables firewall
# Description: An iptables firewall
### END INIT INFO
. /lib/lsb/init-functions
NAME="firewall"
abort()
{
message=$@
log_failure_msg "$message"
exit 1
}
if [ -f "/etc/firewall/firewall.conf" ]; then
source /etc/firewall/firewall.conf
else
abort "No configuration file /etc/firewall/firewall.conf"
fi
clean()
{
$IPTABLES -t filter -F
$IPTABLES -t filter -X
$IPTABLES -t filter -P INPUT ACCEPT
$IPTABLES -t filter -P FORWARD ACCEPT
$IPTABLES -t filter -P OUTPUT ACCEPT
$IPTABLES -t nat -F
$IPTABLES -t nat -X
$IPTABLES -t nat -P PREROUTING ACCEPT
$IPTABLES -t nat -P OUTPUT ACCEPT
$IPTABLES -t nat -P POSTROUTING ACCEPT
$IPTABLES -t mangle -F
$IPTABLES -t mangle -X
$IPTABLES -t mangle -P PREROUTING ACCEPT
$IPTABLES -t mangle -P INPUT ACCEPT
$IPTABLES -t mangle -P FORWARD ACCEPT
}
test_config()
{
# FIXME: test if the interface and the ip exist
if [ ! "$WAN_INT" -o ! "$IP" ]; then
abort "Bad configuration please check /etc/firewall/firewall.conf"
fi
}
critical_return()
{
if [ `echo $?` != 0 ]; then
log_failure_msg "Error on the last command firewall will be stop"
stop
exit 1
fi
}
forward_port()
{
if [ $# != 4 ]; then
log_warning_msg "Bad syntax for port forward : $*"
return
fi
local source=$1
local port=$2
local destination=$3
local proto=$4
if echo "$destination" | grep -q ":"; then
dest_ip=$(echo $destination | cut -d ":" -f1)
dest_port=$(echo $destination | cut -d ":" -f2)
if [ ! "$LAN_INT" ]; then
log_warning_msg "You must add a LAN interface (LAN_INT) for a port forward"
else
log_action_msg "Forward $port to $destination for protocol $proto"
$IPTABLES -A FORWARD -i $WAN_INT -o $LAN_INT -p $proto -s $source -d $dest_ip --dport $dest_port -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT
$IPTABLES -t nat -A PREROUTING -i $WAN_INT -p $proto -s $source -d $IP --dport $port -j DNAT --to $destination
fi
fi
}
open_port()
{
if [ $# == 4 ]; then
local destination=$2
local proto=$3
local ports=$4
elif [ $# == 3 ]; then
local destination=$IP
local proto=$2
local ports=$3
else
log_warning_msg "Open port bad syntax : $*"
fi
source=$1
log_action_msg "Open port(s) $ports from $source to $destination for protocol $proto"
$IPTABLES -A INPUT -i $WAN_INT -p $proto -s $source -d $destination -m multiport --dports $ports -m state --state NEW -j ACCEPT
critical_return
}
port_redirection()
{
if [ $# != 4 ]; then
log_warning_msg "Bad syntax for port redirection : $*"
return
fi
local if=$1
local proto=$2
local srcport=$3
local destport=$4
log_action_msg "Redirect $if port $srcport to $destport for portocol $proto"
iptables -t nat -A PREROUTING -i $if -p $proto --dport $srcport -j REDIRECT --to-port $destport
}
port_knocking()
{
if [ $# != 3 ]; then
log_warning_msg "Bad syntax for port knocking : $*"
return
fi
local ports=$1
local knock_ports=$2
local knock_number=$3
local i=0
for kport in $(echo $knock_ports | sed 's/,/ /g'); do
((i++))
tock_number=$knock_number$i
if [ $i -gt 1 ]; then
iptables -N toc${tock_number}
iptables -A toc${tock_number} -m recent --name toc$((${tock_number}-1)) --remove
iptables -A toc${tock_number} -m recent --name toc${tock_number} --set
iptables -A INPUT -i $WAN_INT -p tcp --dport $kport -m recent --rcheck --name toc$((${tock_number}-1)) -j toc${tock_number}
else
iptables -A INPUT -i $WAN_INT -p tcp --dport $kport -m recent --set --name toc${tock_number}
fi
done
log_action_msg "Port knocking for $ports with combinaison $knock_ports on $WAN_INT"
for port in $(echo $ports | sed 's/,/ /g'); do
iptables -A INPUT -i $WAN_INT -p tcp --dport $port -m recent --rcheck --seconds 15 --name toc${tock_number} -m state --state NEW -j ACCEPT
done
}
start()
{
test_config
modprobe ip_conntrack
clean
# default policies
$IPTABLES -P INPUT DROP
$IPTABLES -P FORWARD DROP
$IPTABLES -P OUTPUT DROP
## allow packets coming from the machine
$IPTABLES -A INPUT -i lo -j ACCEPT
$IPTABLES -A OUTPUT -o lo -j ACCEPT
log_action_msg "Allow WAN outgoing traffic"
$IPTABLES -A OUTPUT -o $WAN_INT -p all -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT
$IPTABLES -A INPUT -i $WAN_INT -p all -m state --state ESTABLISHED,RELATED -j ACCEPT
critical_return
if [ $LAN == 1 ]; then
log_action_msg "Allow WAN outgoing traffic from lan"
$IPTABLES -A FORWARD -i $WAN_INT -o $LAN_INT -p all -d $LAN_NETWORK -m state --state RELATED,ESTABLISHED -j ACCEPT
$IPTABLES -A FORWARD -i $LAN_INT -o $WAN_INT -p all -s $LAN_NETWORK -m state --state ESTABLISHED,RELATED,NEW -j ACCEPT
log_action_msg "Allow local network"
$IPTABLES -A OUTPUT -o $LAN_INT -s $LAN_NETWORK -p all -j ACCEPT
$IPTABLES -A INPUT -i $LAN_INT -d $LAN_NETWORK -p all -j ACCEPT
fi
## block spoofing
log_action_msg "Block spoofing, scan port, Xmas Tree, null scanning, SYN/RST and SYN/FIN"
echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter
## NMAP FIN/URG/PSH
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL FIN,URG,PSH -j LOG --log-prefix 'iptables: Port scan: ' --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL FIN,URG,PSH -j DROP
## stop Xmas Tree type scanning
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL ALL -j LOG --log-prefix "iptables: Xmas tree: " --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL ALL -j DROP
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j LOG --log-prefix "iptables: Xmas tree: " --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j DROP
## stop null scanning
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL NONE -j LOG --log-prefix "iptables: Null scanning: " --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags ALL NONE -j DROP
## SYN/RST
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags SYN,RST SYN,RST -j LOG --log-prefix "iptables: SYN/RST: " --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags SYN,RST SYN,RST -j DROP
## SYN/FIN
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags SYN,FIN SYN,FIN -j LOG --log-prefix "iptables: SYN/FIN: " --log-level 4
$IPTABLES -A INPUT -i $WAN_INT -p tcp --tcp-flags SYN,FIN SYN,FIN -j DROP
## stop sync flood
log_action_msg "Block Syn flood"
echo "1" >/proc/sys/net/ipv4/tcp_syncookies
echo "1024" > /proc/sys/net/ipv4/tcp_max_syn_backlog
if [ $PING == 1 ]; then
log_action_msg "PING allowed"
iptables -A INPUT -p icmp --icmp-type ping -j ACCEPT
iptables -A OUTPUT -p icmp --icmp-type ping -j ACCEPT
iptables -A FORWARD -p icmp --icmp-type ping -j ACCEPT
fi
if [ $FTP == 1 ]; then
log_action_msg "FTP allowed"
modprobe ip_conntrack_ftp
$IPTABLES -A INPUT -i $WAN_INT -d $IP -p tcp --dport ftp -m state --state NEW,ESTABLISHED -j ACCEPT
$IPTABLES -A OUTPUT -o $WAN_INT -s $IP -p tcp --sport ftp -m state --state ESTABLISHED -j ACCEPT
# Data
$IPTABLES -A INPUT -i $WAN_INT -d $IP -p tcp --dport ftp-data -m state --state ESTABLISHED -j ACCEPT
$IPTABLES -A OUTPUT -o $WAN_INT -s $IP -p tcp --sport ftp-data -m state --state ESTABLISHED,RELATED -j ACCEPT
# Passive mod
$IPTABLES -A INPUT -i $WAN_INT -d $IP -p tcp --sport 1024: --dport 1024: -m state --state ESTABLISHED -j ACCEPT
$IPTABLES -A OUTPUT -o $WAN_INT -s $IP -p tcp --sport 1024: --dport 1024: -m state --state ESTABLISHED,RELATED -j ACCEPT
fi
## Open Ports
for args in "${OPEN_PORTS[@]}"; do
open_port $args
done
## Port knocking
local i=1
for args in "${PORT_KNOCK[@]}"; do
port_knocking $args $i
((i++))
done
## Port forwading
for args in "${TRAFFICS[@]}"; do
forward_port $args
done
## Port redirection
for args in "${REDIRECTIONS[@]}"; do
port_redirection $args
done
## Old: Whitelist
for arg in "${WHITELIST_SSH[@]}"; do
log_warning_msg "WHITELIST_SSH is obsolete: this option will be removed in next version"
open_port $arg tcp ssh
done
for ip in "${WHITELIST[@]}"; do
for args in "${WHITELIST_OPEN_PORTS[@]}"; do
open_port $ip $args
done
done
## NAT
if [ $NAT == 1 ]; then
log_action_msg "Activate nat"
for proto in ftp irc sip h323; do modprobe nf_nat_$proto; done
$IPTABLES -t nat -A POSTROUTING -o $WAN_INT -s $LAN_NETWORK -j SNAT --to-source $IP
fi
ipt_hook
## LOG
## Create a LOGDROP chain to log and drop packets
$IPTABLES -N LOGDROP
$IPTABLES -A LOGDROP -p tcp -m limit --limit 1/min -j LOG --log-prefix "iptables: denied tcp: " --log-level 4
$IPTABLES -A LOGDROP -p udp -m limit --limit 1/min -j LOG --log-prefix "iptables: denied udp: " --log-level 4
$IPTABLES -A LOGDROP -p icmp -m limit --limit 1/min -j LOG --log-prefix "iptables: denied icmp: " --log-level 4
$IPTABLES -A LOGDROP -j DROP
$IPTABLES -A INPUT -j LOGDROP
$IPTABLES -A OUTPUT -j LOGDROP
$IPTABLES -A FORWARD -j LOGDROP
}
stop()
{
clean
}
case "$1" in
start|restore)
log_daemon_msg "Starting firewall"
if [ -f /etc/network/iptables-save ]; then
iptables-restore < /etc/network/iptables-save
else
log_warning_msg "No iptables rules saved please use test and save script options"
fi
log_end_msg 0
;;
stop)
log_daemon_msg "Stopping firewall"
stop || exit 1
log_end_msg 0
;;
test)
log_action_msg "Testing new rules"
log_action_msg "You have 30 seconds to test your new rules"
start || exit 1
log_end_msg 0
log_action_msg "... Please test your rules"
sleep 30
log_action_msg "---- The test is finished ----"
if [ -f /etc/network/iptables-save ]; then
iptables-restore < /etc/network/iptables-save
log_action_msg "Old rules restored"
else
stop
log_action_msg "Rules flushed"
fi
log_action_msg "If you are happy with this new rules please use save option"
;;
save)
log_action_msg "Starting and saving new rules"
start || exit 1
iptables-save > /etc/network/iptables-save
log_end_msg 0
;;
*)
N=/etc/init.d/$NAME
echo "Usage: $N {start|restore|save|test|stop}"
exit 2
;;
esac
exit 0

View File

@ -1,58 +0,0 @@
IPTABLES=/sbin/iptables
## WAN configuration
WAN_INT='' # WAN interface
IP='' # WAN IP
PING=1 # Allow ping
FTP=0 # Allow FTP server (passive and active)
## LAN configuration
NAT=0 # Activate nat (need a LAN_NETWORK)
LAN_NETWORK='' # LAN network (ex: 192.168.1.0/24)
LAN=0 # Allow traffic between the WAN and LAN
LAN_INT='' # LAN interface
## Allow all traffic for interface(s)
# example ALLOW_INTS='br0 xenbr42'
ALLOW_INTS=''
## Open ports
# "source [destination] protocole {porta|portx:porty},[portx:porty,porta,portb,...]" ...
# The default destination is the IP !
# example : OPEN_PORTS=("0.0.0.0/0 tcp 22"
# "42.42.42.0/24 42.42.42.42 tcp ssh,imap,imaps,1024:2048,32")
OPEN_PORTS=("0.0.0.0/0 tcp ssh")
## Port knocking (tcp only)
# "port[,port] knock_ports_combinaison"
# example : PORT_KNOCK("22,4242 121,4353,4242,111")
PORT_KNOCK=()
## Port forwarding
# "source port destination:port protocol" "source port destination:port protocol" ...
# example : TRAFFICS=("0.0.0.0/0 80 192.168.0.42:80 tcp" "42.42.42.42 4242 192.168.0.43:22 tcp")
TRAFFICS=()
## Port redirection
# "interface protocol sourceport destport" ...
# example : REDIRECTIONS=("eth42 tcp 32 25" "$LAN_INT tcp 25 4242")
REDIRECTIONS=()
## Whitelist
# example with an external file
# source /etc/firewall/whitelist_ssh
# WHITELIST=(${WHITELIST[@])
# example : WHITELIST=("1.2.3.4" "1.3.4.4" "192.168.1.0/24")
#WHITELIST=()
## Whitelist port and protocol
# exmaple : WHITELIST_OPEN_PORTS=("tcp ssh,8006" "udp 4242")
# Hook point to write your own iptables rules
ipt_hook()
{
echo "+ Load your own iptables rules"
# Write your own iptables rules here
}

View File

@ -1,2 +0,0 @@
:msg,contains,"iptables:" /var/log/iptables.log
& ~