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smh
18.05.05, 22:28
Hallo, habe ein Problem mit der Firewall von meinen Server (Magnia SG20).
Ich bekomme es nicht hin emule zum Laufen zu bringen. Ich bin der Meinung es liegt an der Firewall. (Und wie mache ich das mit der Weiterleitung auf den emule PC?? Ich weiß nicht mehr weiter HILFE... :confused: :confused:
Hier die iptables.sh :
(Redhat Linux 7.3)



# DO NOT EDIT THIS FILE! IT IS AUTOGENERATED!
# edit the files in /sa2/templates/etc/sysconfig/iptables.sh
# to modify this file, then call /sa/bin/template
################################################## ###############################
#
# IPTABLES Firewall v 0.86
# by shadow999@firemail.de
#
# Small parts from http://members.optusnet.com.au/~technion/
# and some tutorials
#
# This script is intended to setup a masquerading firewall based on
# the IPTABLES (Net)filter-machanism of Linux 2.3.15+
# Syslogging matches fireparse for graphical output (see http://www.fireparse.com)
#
# Normally this script will work 'out-of-the-box', but you should adapt it to
# your own needs (At least you should set the correct default interfaces
# --> see Default-Interfaces section)
#
# Comments, suggestions, etc. are welcome
#
# Usage on your own risk ;)
#
# Syntax to invoke script: firewall (start|stop|restart|status) EXTIF INTIF
# Example: "firewall start ppp0 eth0"
#
################################################## ###############################
#
# Version History:
#
# 0.86: Added a few comments
#
# 0.85: Various re-arrangements
# Added TCP-SYN-flood protection
# Added separate logging of pingfloods
# Added automatic detection of parameters on internal interface
# Made flooding-parameters variable
#
# 0.84: Added special ICMP-Filtering
#
# 0.83: Added ICMP-logging-chain
# Some minor changes
#
# 0.82: Reorganized parts of the script
# Added special user-chains
#
# 0.80: Altered logging strings to match fireparse
#
# 0.78: Added many comments
# Completed flushing of tables (missing -X)
#
# 0.75: Added automatic detection of IP-address, gateway, etc of external interface
#
# 0.7: Added new logging-chains
#
# 0.65: Added special sanity checks for TCP-Flags
# Silently filter out SMB-traffic
# Removed unclean-checks (according to some docs still unstable)
#
# 0.6: Major redesign of whole script, divided into chain-sections
#
# 0.5: Adopted parts of firewall-script from http://members.optusnet.com.au/~technion/
# Minor changes
#
#
################################################## ######################################

#!/bin/sh

# This is the location of the iptables command
IPTABLES="/sbin/iptables"


case "$1" in
stop)
echo "Shutting down firewall..."
$IPTABLES -F
# $IPTABLES -F -t mangle
$IPTABLES -F -t nat
$IPTABLES -X
# $IPTABLES -X -t mangle
$IPTABLES -X -t nat

$IPTABLES -P INPUT ACCEPT
$IPTABLES -P OUTPUT ACCEPT
$IPTABLES -P FORWARD ACCEPT
echo "...done"
;;
status)
echo $"Table: filter"
iptables --list
echo $"Table: nat"
iptables -t nat --list
# echo $"Table: mangle"
# iptables -t mangle --list
;;
restart|reload)
$0 stop
$0 start
;;
start)
echo "Starting Firewall..."
echo ""


##--------------------------Begin Firewall---------------------------------##


#----Default-Interfaces-----#

## Default external interface (used, if EXTIF isn't specified on command line)
DEFAULT_EXTIF="eth1"

## Default internal interface (used, if INTIF isn't specified on command line)
DEFAULT_INTIF="brg0"

## Default ipsec device
IPSECIF="ipsec0"


#----Special Variables-----#

# IP Mask for all IP addresses
UNIVERSE="0.0.0.0/0"

# Specification of the high unprivileged IP ports.
UNPRIVPORTS="1024:65535"

# Specification of X Window System (TCP) ports.
XWINPORTS="6000:6063"

# Ports for IRC-Connection-Tracking
IRCPORTS="6665,6666,6667,6668,6669,7000"


#-----Port-Forwarding Variables-----#

#For port-forwarding to an internal host, define a variable with the appropriate
#internal IP-Address here and take a look at the port-forwarding sections in the FORWARD +
#PREROUTING-chain:

#These are examples, uncomment to activate

#IP for forwarded Battlecom-traffic
#BATTLECOMIP="192.168.0.5"



#----Flood Variables-----#

# Overall Limit for TCP-SYN-Flood detection
TCPSYNLIMIT="5/s"
# Burst Limit for TCP-SYN-Flood detection
TCPSYNLIMITBURST="10"

# Overall Limit for Loggging in Logging-Chains
LOGLIMIT="2/s"
# Burst Limit for Logging in Logging-Chains
LOGLIMITBURST="10"

# Overall Limit for Ping-Flood-Detection
PINGLIMIT="5/s"
# Burst Limit for Ping-Flood-Detection
PINGLIMITBURST="10"



#----Automatically determine infos about involved interfaces-----#

### External Interface:

## Get external interface from command-line
## If no interface is specified then set $DEFAULT_EXTIF as EXTIF

#if [ "x$2" != "x" ]; then
# EXTIF=ppp0
#else
# EXTIF=$DEFAULT_EXTIF
#fi
EXTIF=ppp0
echo External Interface: $EXTIF

EXTIP=""
if [ "$EXTIF" != "" ]; then
# Determine external IP
EXTIP="`ifconfig $EXTIF | grep inet | cut -d : -f 2 | cut -d \ -f 1`"
# It is ok if we don't have an address yet. We won't define any rules
# where EXTIP is blank
# if [ "$EXTIP" = '' ]; then
# echo "Aborting: Unable to determine the IP-address of $EXTIF !"
# exit 1
# fi
fi
echo External IP: $EXTIP

## Determine external gateway
EXTGW=`route -n | grep -A 4 UG | awk '{ print $2}'`
echo Default GW: $EXTGW


echo " --- "


### Internal Interface:

## Get internal interface from command-line
## If no interface is specified then set $DEFAULT_INTIF as INTIF
if [ "x$3" != "x" ]; then
INTIF=$3
else
INTIF=$DEFAULT_INTIF
fi
echo Internal Interface: $INTIF

## Determine internal IP
INTIP="192.168.1.1"
#INTIP="`ifconfig $INTIF | grep inet | cut -d : -f 2 | cut -d \ -f 1`"
# if [ "$INTIP" = '' ]; then
# echo "Aborting: Unable to determine the IP-address of $INTIF !"
# exit 1
# fi
echo Internal IP: $INTIP

#IP for forwarded HTTP-traffic
HTTPIP="$INTIP"

## Determine internal netmask
INTMASK="255.255.255.0"
#INTMASK="`ifconfig $INTIF | grep Mask | cut -d : -f 4`"
echo Internal Netmask: $INTMASK

## Determine network address of the internal network
INTLAN=$INTIP'/'$INTMASK
echo Internal LAN: $INTLAN

echo ""


#----Load IPTABLES-modules-----#


#Insert modules- should be done automatically if needed

#If the IRC-modules are available, uncomment them below

echo "Loading IPTABLES modules"

dmesg -n 1 #Kill copyright display on module load
/sbin/modprobe ip_tables
/sbin/modprobe iptable_filter
/sbin/modprobe ip_conntrack
/sbin/modprobe ip_conntrack_ftp
/sbin/modprobe ip_nat_ftp
/sbin/modprobe ip_conntrack_irc ports=$IRCPORTS
/sbin/modprobe ip_nat_irc ports=$IRCPORTS
dmesg -n 6

echo " --- "


#----Clear/Reset all chains-----#

#Clear all IPTABLES-chains

#Flush everything, start from scratch
$IPTABLES -F
#$IPTABLES -F -t mangle
$IPTABLES -F -t nat
$IPTABLES -X
#$IPTABLES -X -t mangle
$IPTABLES -X -t nat


#Set default policies to DROP
$IPTABLES -P INPUT DROP
$IPTABLES -P OUTPUT DROP
$IPTABLES -P FORWARD DROP



#----Set network sysctl options-----#


echo "Setting sysctl options"

#Enable forwarding in kernel
echo 1 > /proc/sys/net/ipv4/ip_forward

#Disabling IP Spoofing attacks.
echo 2 > /proc/sys/net/ipv4/conf/all/rp_filter

#Don't respond to broadcast pings (Smurf-Amplifier-Protection)
echo "1" > /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

#Block source routing
echo 0 > /proc/sys/net/ipv4/conf/all/accept_source_route

#Kill timestamps
echo 0 > /proc/sys/net/ipv4/tcp_timestamps

#Enable SYN Cookies
echo 1 > /proc/sys/net/ipv4/tcp_syncookies

#Kill redirects
echo 0 > /proc/sys/net/ipv4/conf/all/accept_redirects

#Enable bad error message protection
echo 1 > /proc/sys/net/ipv4/icmp_ignore_bogus_error_responses

#Log martians (packets with impossible addresses)
#echo 1 > /proc/sys/net/ipv4/conf/all/log_martians

#Set out local port range
echo "32768 61000" > /proc/sys/net/ipv4/ip_local_port_range

#Reduce DoS'ing ability by reducing timeouts
echo 30 > /proc/sys/net/ipv4/tcp_fin_timeout
echo 2400 > /proc/sys/net/ipv4/tcp_keepalive_time
echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
echo 0 > /proc/sys/net/ipv4/tcp_sack
echo " --- "

echo "Creating user-chains"

#----Create logging chains-----#

##These are the logging-chains. They all have a certain limit of log-entries/sec to prevent log-flooding
##The syslog-entries will be fireparse-compatible (see http://www.fireparse.com)


#Invalid packets (not ESTABLISHED,RELATED or NEW)
$IPTABLES -N LINVALID
$IPTABLES -A LINVALID -j DROP

#TCP-Packets with one ore more bad flags
$IPTABLES -N LBADFLAG
$IPTABLES -A LBADFLAG -j DROP

#Logging of connection attempts on special ports (Trojan portscans, special services, etc.)
$IPTABLES -N LSPECIALPORT
$IPTABLES -A LSPECIALPORT -j DROP

#Logging of possible TCP-SYN-Floods
$IPTABLES -N LSYNFLOOD
$IPTABLES -A LSYNFLOOD -j DROP

#Logging of possible Ping-Floods
$IPTABLES -N LPINGFLOOD
$IPTABLES -A LPINGFLOOD -j DROP


#All other dropped packets
$IPTABLES -N LDROP
$IPTABLES -A LDROP -j DROP

#All other rejected packets
$IPTABLES -N LREJECT
$IPTABLES -A LREJECT -p tcp -j REJECT --reject-with tcp-reset
$IPTABLES -A LREJECT -p udp -j REJECT --reject-with icmp-port-unreachable
$IPTABLES -A LREJECT -j REJECT



#----Create Accept-Chains-----#


#TCPACCEPT - Check for SYN-Floods before letting TCP-Packets in

$IPTABLES -N TCPACCEPT
$IPTABLES -A TCPACCEPT -p tcp --syn -m limit --limit $TCPSYNLIMIT --limit-burst $TCPSYNLIMITBURST -j ACCEPT
$IPTABLES -A TCPACCEPT -p tcp --syn -j LSYNFLOOD
$IPTABLES -A TCPACCEPT -p tcp ! --syn -j ACCEPT


#----Create special User-Chains-----#


#CHECKBADFLAG - Kill any Inbound/Outbound TCP-Packets with impossible flag-combinations (Some port-scanners use these, eg. nmap Xmas,Null,etc.-scan)

$IPTABLES -N CHECKBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags ALL FIN,URG,PSH -j LBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags ALL SYN,RST,ACK,FIN,URG -j LBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags ALL ALL -j LBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags ALL NONE -j LBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags SYN,RST SYN,RST -j LBADFLAG
$IPTABLES -A CHECKBADFLAG -p tcp --tcp-flags SYN,FIN SYN,FIN -j LBADFLAG



#FILTERING FOR SPECIAL PORTS


#Inbound/Outbound SILENTDROPS/REJECTS (Things we don't want in our Logs)

#SMB-Traffic
$IPTABLES -N SMB

$IPTABLES -A SMB -p tcp --dport 137 -j DROP
$IPTABLES -A SMB -p tcp --dport 138 -j DROP
$IPTABLES -A SMB -p tcp --dport 139 -j DROP
$IPTABLES -A SMB -p tcp --dport 445 -j DROP
$IPTABLES -A SMB -p udp --dport 137 -j DROP
$IPTABLES -A SMB -p udp --dport 138 -j DROP
$IPTABLES -A SMB -p udp --dport 139 -j DROP
$IPTABLES -A SMB -p udp --dport 445 -j DROP

$IPTABLES -A SMB -p tcp --sport 137 -j DROP
$IPTABLES -A SMB -p tcp --sport 138 -j DROP
$IPTABLES -A SMB -p tcp --sport 139 -j DROP
$IPTABLES -A SMB -p tcp --sport 445 -j DROP
$IPTABLES -A SMB -p udp --sport 137 -j DROP
$IPTABLES -A SMB -p udp --sport 138 -j DROP
$IPTABLES -A SMB -p udp --sport 139 -j DROP
$IPTABLES -A SMB -p udp --sport 445 -j DROP


#Inbound Special Ports

$IPTABLES -N SPECIALPORTS

#Deepthroat Scan
$IPTABLES -A SPECIALPORTS -p tcp --dport 6670 -j LSPECIALPORT

#Subseven Scan
$IPTABLES -A SPECIALPORTS -p tcp --dport 1243 -j LSPECIALPORT
$IPTABLES -A SPECIALPORTS -p udp --dport 1243 -j LSPECIALPORT
$IPTABLES -A SPECIALPORTS -p tcp --dport 27374 -j LSPECIALPORT
$IPTABLES -A SPECIALPORTS -p udp --dport 27374 -j LSPECIALPORT
$IPTABLES -A SPECIALPORTS -p tcp --dport 6711:6713 -j LSPECIALPORT

#Netbus Scan
$IPTABLES -A SPECIALPORTS -p tcp --dport 12345:12346 -j LSPECIALPORT
$IPTABLES -A SPECIALPORTS -p tcp --dport 20034 -j LSPECIALPORT

#Back Orifice scan
$IPTABLES -A SPECIALPORTS -p udp --dport 31337:31338 -j LSPECIALPORT

#X-Win
$IPTABLES -A SPECIALPORTS -p tcp --dport $XWINPORTS -j LSPECIALPORT

#Hack'a'Tack 2000
$IPTABLES -A SPECIALPORTS -p udp --dport 28431 -j LSPECIALPORT



#ICMP/TRACEROUTE FILTERING


#Inbound ICMP/Traceroute

$IPTABLES -N ICMPINBOUND

#Ping Flood protection. Accept $PINGLIMIT echo-requests/sec, rest will be logged/dropped
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type echo-request -m limit --limit $PINGLIMIT --limit-burst $PINGLIMITBURST -j ACCEPT
#
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type echo-request -j LPINGFLOOD

#Block ICMP-Redirects (Should already be catched by sysctl-options, if enabled)
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type redirect -j LDROP

#Block ICMP-Timestamp (Should already be catched by sysctl-options, if enabled)
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type timestamp-request -j LDROP
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type timestamp-reply -j LDROP

#Block ICMP-address-mask (can help to prevent OS-fingerprinting)
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type address-mask-request -j LDROP
$IPTABLES -A ICMPINBOUND -p icmp --icmp-type address-mask-reply -j LDROP


#Allow all other ICMP in
$IPTABLES -A ICMPINBOUND -p icmp -j ACCEPT




#Outbound ICMP/Traceroute

$IPTABLES -N ICMPOUTBOUND

#Block ICMP-Redirects (Should already be catched by sysctl-options, if enabled)
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type redirect -j LDROP

#Block ICMP-TTL-Expired
#MS Traceroute (MS uses ICMP instead of UDp for tracert)
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type ttl-zero-during-transit -j LDROP
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type ttl-zero-during-reassembly -j LDROP

#Block ICMP-Parameter-Problem
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type parameter-problem -j LDROP

#Block ICMP-Timestamp (Should already be catched by sysctl-options, if enabled)
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type timestamp-request -j LDROP
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type timestamp-reply -j LDROP

#Block ICMP-address-mask (can help to prevent OS-fingerprinting)
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type address-mask-request -j LDROP
$IPTABLES -A ICMPOUTBOUND -p icmp --icmp-type address-mask-reply -j LDROP


##Accept all other ICMP going out
$IPTABLES -A ICMPOUTBOUND -p icmp -j ACCEPT



#----End User-Chains-----#


#----Start Ruleset-----#

echo "Implementing firewall rules..."


#################
## INPUT-Chain ## (everything that is addressed to the firewall itself)
#################


##GENERAL Filtering

# Kill INVALID packets (not ESTABLISHED, RELATED or NEW)
$IPTABLES -A INPUT -m state --state INVALID -j LINVALID

# Check TCP-Packets for Bad Flags
$IPTABLES -A INPUT -p tcp -j CHECKBADFLAG


##Packets FROM FIREWALL-BOX ITSELF

#Local IF
$IPTABLES -A INPUT -i lo -j ACCEPT
#
#Kill connections to the local interface from the outside world (--> Should be already catched by kernel/rp_filter)
$IPTABLES -A INPUT -d 127.0.0.0/8 -j LREJECT


##Packets FROM INTERNAL NET


##Allow unlimited traffic from internal network using legit addresses to firewall-box
##If protection from the internal interface is needed, alter it

$IPTABLES -A INPUT -i $INTIF -s $INTLAN -j ACCEPT



## Allow dialin traffic to talk on the private side
# allow all traffic from internal network on internal
$IPTABLES -A INPUT -s 192.168.1.0/24 -i ppp+ -j ACCEPT

# allow all traffic from our pptp subnet on ppp+
$IPTABLES -A INPUT -i ppp+ -s 192.168.1.0/24 -j ACCEPT
# allow pptp traffic (high ports->port 1723) on public if
$IPTABLES -A INPUT -i $EXTIF -p tcp --sport 1024:65535 --dport 1723 -j ACCEPT
# allow GRE traffic on public if
$IPTABLES -A INPUT -i $EXTIF -p 47 -j ACCEPT


#Kill anything else from outside claiming to be from internal network (Address-Spoofing --> Should be already catched by rp_filter)
$IPTABLES -A INPUT -s $INTLAN -j LREJECT



##Packets FROM EXTERNAL NET


##ICMP & Traceroute filtering

#Filter ICMP
if [ "$EXTIF" != "" ]; then
$IPTABLES -A INPUT -i $EXTIF -p icmp -j ICMPINBOUND
fi

#Block UDP-Traceroute
$IPTABLES -A INPUT -p udp --dport 33434:33523 -j LDROP


##Silent Drops/Rejects (Things we don't want in our logs)

#Drop all SMB-Traffic
if [ "$EXTIF" != "" ]; then
# $IPTABLES -A INPUT -i $EXTIF -j SMB

#Silently reject Ident (Don't DROP ident, because of possible delays when establishing an outbound connection)
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 113 -j REJECT --reject-with tcp-reset


##Public services running ON FIREWALL-BOX (comment out to activate):

# ftp-data
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 20 -j TCPACCEPT

# ftp
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 21 -j TCPACCEPT

# ssh
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 22 -j TCPACCEPT

#telnet
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 23 -j TCPACCEPT

# smtp
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 25 -j TCPACCEPT

# DNS
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 53 -j TCPACCEPT
#$IPTABLES -A INPUT -i $EXTIF -p udp --dport 53 -j ACCEPT

# http
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 80 -j TCPACCEPT

# https
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 443 -j TCPACCEPT

# POP-3
#$IPTABLES -A INPUT -i $EXTIF -p tcp --dport 110 -j TCPACCEPT



##Separate logging of special portscans/connection attempts

$IPTABLES -A INPUT -i $EXTIF -j SPECIALPORTS



##Allow ESTABLISHED/RELATED connections in

$IPTABLES -A INPUT -i $EXTIF -m state --state ESTABLISHED -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -p tcp --dport $UNPRIVPORTS -m state --state RELATED -j TCPACCEPT
$IPTABLES -A INPUT -i $EXTIF -p udp --dport $UNPRIVPORTS -m state --state RELATED -j ACCEPT

fi


$IPTABLES -A INPUT -p udp -i brg0 --sport 68 --dport 67 -j ACCEPT

# allow snmp management consoles
#-A INPUT -d 84.140.95.87 161 -i ppp0 -p udp -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -p udp --dport 161 -j ACCEPT

#-A INPUT -d 84.140.95.87 162 -i ppp0 -p udp -j ACCEPT
$IPTABLES -A INPUT -i $EXTIF -p udp --dport 162 -j ACCEPT

if [ "$EXTIF" != "" ] && [ "$EXTIP" != "" ]; then
# allow icq client - bidirectional
$IPTABLES -A INPUT -p udp -i $EXTIF --sport 4000 -d $EXTIP --dport 1024:65535 -j ACCEPT
$IPTABLES -A INPUT -p udp -i $EXTIF --dport 4000 -s $EXTIP --sport 1024:65535 -j ACCEPT
fi

if [ "$EXTIF" != "" ] && [ "$EXTIP" != "" ]; then
# allow ra client
$IPTABLES -A INPUT -p udp -i $EXTIF --sport 1024:65535 -d $EXTIP --dport 6970:6999 -j ACCEPT
fi

if [ "$EXTIF" != "" ]; then
# allow IPSEC VPN clients through
$IPTABLES -A INPUT -p udp --dport 500 -i $EXTIF -j ACCEPT
$IPTABLES -A INPUT -p 50 -i $EXTIF -j ACCEPT
$IPTABLES -A INPUT -p 51 -i $EXTIF -j ACCEPT
$IPTABLES -A INPUT -p udp --dport 500 -i $IPSECIF -j ACCEPT
$IPTABLES -A INPUT -p 50 -i $IPSECIF -j ACCEPT
$IPTABLES -A INPUT -p 51 -i $IPSECIF -j ACCEPT
$IPTABLES -A INPUT -i $IPSECIF -j ACCEPT
fi



##################
## Output-Chain ## (everything that comes directly from the Firewall-Box)
##################



##Packets TO FIREWALL-BOX ITSELF

#Local IF
$IPTABLES -A OUTPUT -o lo -j ACCEPT


##Packets TO INTERNAL NET

#Allow unlimited traffic to internal network using legit addresses
$IPTABLES -A OUTPUT -o $INTIF -d $INTLAN -j ACCEPT



##Packets TO EXTERNAL NET


##ICMP & Traceroute
if [ "$EXTIF" != "" ]; then

$IPTABLES -A OUTPUT -o $EXTIF -p icmp -j ICMPOUTBOUND



##Silent Drops/Rejects (Things we don't want in our logs)

#SMB
#$IPTABLES -A OUTPUT -o $EXTIF -j SMB

#Ident
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 113 -j REJECT --reject-with tcp-reset



##Public services running ON FIREWALL-BOX (comment out to activate):

# ftp-data
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 20 -j ACCEPT

# ftp
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 21 -j ACCEPT

# ssh
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 22 -m state --state ESTABLISHED -j ACCEPT

#telnet
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 23 -m state --state ESTABLISHED -j ACCEPT

# smtp
#$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 25 -m state --state ESTABLISHED -j ACCEPT

# DNS
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 53 -j ACCEPT
$IPTABLES -A OUTPUT -o $EXTIF -p udp --sport 53 -j ACCEPT

# http
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 80 -m state --state ESTABLISHED -j ACCEPT

# https
$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 443 -m state --state ESTABLISHED -j ACCEPT

# POP-3
#$IPTABLES -A OUTPUT -o $EXTIF -p tcp --sport 110 -m state --state ESTABLISHED -j ACCEPT




##Accept all tcp/udp traffic on unprivileged ports going out

$IPTABLES -A OUTPUT -o $EXTIF -s $EXTIP -p tcp --sport $UNPRIVPORTS -j ACCEPT
$IPTABLES -A OUTPUT -o $EXTIF -s $EXTIP -p udp --sport $UNPRIVPORTS -j ACCEPT

fi


$IPTABLES -A OUTPUT -p udp -o brg0 --dport 68 --sport 67 -j ACCEPT


if [ "$EXTIP" != "" ]; then
# allow all traffic from our pptp subnet on ppp+
$IPTABLES -A OUTPUT -o ppp+ -d 192.168.1.0/24 -j ACCEPT
$IPTABLES -A OUTPUT -o $EXTIF -p tcp ! --syn --dport 1024:65535 -s $EXTIP --sport 1723 -j ACCEPT
# allow GRE traffic on public if
$IPTABLES -A OUTPUT -o $EXTIF -p 47 -s $EXTIP -j ACCEPT
fi


if [ "$EXTIF" != "" ]; then
# allow IPSEC VPN clients through
$IPTABLES -A OUTPUT -p udp --sport 500 -o $EXTIF -j ACCEPT
$IPTABLES -A OUTPUT -p 50 -o $EXTIF -j ACCEPT
$IPTABLES -A OUTPUT -p 51 -o $EXTIF -j ACCEPT
$IPTABLES -A OUTPUT -p udp --sport 500 -o $IPSECIF -j ACCEPT
$IPTABLES -A OUTPUT -p 50 -o $IPSECIF -j ACCEPT
$IPTABLES -A OUTPUT -o $IPSECIF -j ACCEPT
$IPTABLES -A OUTPUT -o $EXTIF -j ACCEPT
fi


####################
## FORWARD-Chain ## (everything that passes the firewall)
####################


##GENERAL Filtering

#Kill invalid packets (not ESTABLISHED, RELATED or NEW)
$IPTABLES -A FORWARD -m state --state INVALID -j LINVALID

# Check TCP-Packets for Bad Flags
$IPTABLES -A FORWARD -p tcp -j CHECKBADFLAG


##Filtering FROM INTERNAL NET


## Allow traffic to flow freely from private clients to private clients
$IPTABLES -A FORWARD -i $INTIF -o $INTIF -s $INTLAN -j ACCEPT

##Silent Drops/Rejects (Things we don't want in our logs)

if [ "$EXTIF" != "" ]; then
#SMB
#$IPTABLES -A FORWARD -o $EXTIF -j SMB


##Special Drops/Rejects
# - To be done -


##Filter for some Trojans communicating to outside
# - To be done -


##Port-Forwarding from Ports < 1024 [outbound] (--> Also see chain PREROUTING)

#HTTP-Forwarding
#$IPTABLES -A FORWARD -o $EXTIF -s $HTTPIP -p tcp --sport 80 -j ACCEPT


##Allow all other forwarding (from Ports > 1024) from Internal Net to External Net
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -s $INTLAN -p tcp --sport $UNPRIVPORTS -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -s $INTLAN -p udp --sport $UNPRIVPORTS -j ACCEPT
$IPTABLES -A FORWARD -i $INTIF -o $EXTIF -s $INTLAN -p icmp -j ACCEPT



##Filtering FROM EXTERNAL NET


##Silent Drops/Rejects (Things we don't want in our logs)

#SMB
$IPTABLES -A FORWARD -i $EXTIF -j SMB


##Allow replies coming in
$IPTABLES -A FORWARD -i $EXTIF -m state --state ESTABLISHED -j ACCEPT
$IPTABLES -A FORWARD -i $EXTIF -p tcp --dport $UNPRIVPORTS -m state --state RELATED -j TCPACCEPT
$IPTABLES -A FORWARD -i $EXTIF -p udp --dport $UNPRIVPORTS -m state --state RELATED -j ACCEPT
$IPTABLES -A FORWARD -i $EXTIF -p icmp -m state --state RELATED -j ACCEPT


##Port-Forwarding [inbound] (--> Also see chain PREROUTING)

#HTTP-Forwarding
#$IPTABLES -A FORWARD -i $EXTIF -p tcp -d $HTTPIP --dport 80 -j ACCEPT

fi





# forward freely between private subnet and pptp subnet
$IPTABLES -A FORWARD -i brg0 -s 192.168.1.0/24 -d 192.168.1.0/24 -j ACCEPT
$IPTABLES -A FORWARD -i ppp+ -s 192.168.1.0/24 -d 192.168.1.0/24 -j ACCEPT
$IPTABLES -A FORWARD -i ppp+ -o $EXTIF -s 192.168.1.0/24 -p tcp --sport $UNPRIVPORTS -j ACCEPT

################
## PREROUTING ##
################

##Port-Forwarding (--> Also see chain FORWARD)

###################
## POSTROUTING ##
###################

if [ "$EXTIF" != "" ]; then
#Masquerade from Internal Net to External Net
$IPTABLES -A POSTROUTING -t nat -o $EXTIF -j MASQUERADE
fi

# allow Checkpoint VPN clients through
# Note that ports 500 and 2746 are the source ports, not destination ports.
$IPTABLES -A FORWARD -p udp -s ANY/0 --sport 500 -i $INTIF -o $EXTIF -j ACCEPT
$IPTABLES -A FORWARD -p udp -s ANY/0 --sport 2746 -i $INTIF -o $EXTIF -j ACCEPT

# allow Internet games to work
$IPTABLES -A FORWARD -p udp -s ANY/0 --sport 1024:65535 -i $INTIF -o $EXTIF -j ACCEPT

# allow ssh server
$IPTABLES -A INPUT -p tcp -i $EXTIF -d $EXTIP --dport 22 -j ACCEPT

# allow http and https servers
$IPTABLES -A INPUT -p tcp -i $EXTIF -d $EXTIP --dport 80 -j ACCEPT
$IPTABLES -A INPUT -p tcp -i $EXTIF -d $EXTIP --dport 443 -j ACCEPT

##Catch all rule/Deny every other forwarding

$IPTABLES -A FORWARD -j LDROP

##Catch all rule
$IPTABLES -A INPUT -j LDROP

##Catch all rule

$IPTABLES -A OUTPUT -j LDROP


##--------------------------------End Firewall---------------------------------##



;;
*)
echo "Usage: firewall (start|stop|restart|status) EXTIF INTIF"
exit 1
esac

exit 0
# END AUTOGENERATED TEMPLATE