Administrace komentářů

<pre>

#! /bin/sh                                                                                                                                 

PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"

WAN_IP="xxx.xxx.xxx.xxx"
IPTABLES="/sbin/iptables"

LAN="eth0"
WIFI="ath0"
WAN="eth1"

set -e

case "$1" in
  start)   
        echo -n "Nahravam pravidla pro iptables (firewall,masquerade)"

        # =============================================================

        # Paranoia zakladni politka
        $IPTABLES -P INPUT DROP   
        $IPTABLES -P OUTPUT ACCEPT
        $IPTABLES -P FORWARD DROP 

        # rp_filter na zamezeni IP spoofovani
        for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 1 > $f; done

        # Ochrana pred Dos utokem
        echo 1 >/proc/sys/net/ipv4/tcp_syncookies
                                                

        # Flush all old
        $IPTABLES -F  
        $IPTABLES -t nat -F

        # =============================================================
        # Loopback a interni interface                                
        # =============================================================

        $IPTABLES -A INPUT -i lo -j ACCEPT
        $IPTABLES -A INPUT -i $LAN -j ACCEPT
        $IPTABLES -A INPUT -i $WIFI -j ACCEPT

        # =============================================================
        # Externi interface                                           
        # =============================================================

        $IPTABLES -A INPUT -i $WAN -p UDP -s 0/0 --sport 53 -d $WAN_IP --dport 1025: -j ACCEPT          #DNS
        $IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 22000 -j ACCEPT                     #SSH
        #$IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 5060 -j ACCEPT                     #WWW
        #$IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 21 -j ACCEPT                       #FTP
        #$IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 443 -j ACCEPT                      #HTTPS
        #$IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 8000 -j ACCEPT                     #IceCast radio
        #================================================================================================SIP         

        $IPTABLES -A INPUT -i $WAN -p UDP -s 0/0 -d $WAN_IP --dport 5000:5100 -j ACCEPT                 # SIP signalling, listen port: 5060
        $IPTABLES -A INPUT -i $WAN -p UDP -s 0/0 -d $WAN_IP --dport 8088 -j ACCEPT                      # Outgoing traffic to the STUN server
        $IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 8088 -j ACCEPT                      # H323 listen port                   
        #================================================================================================Torrent                     
        $IPTABLES -A INPUT -i $WAN -p TCP -s 0/0 -d $WAN_IP --dport 6881 -j ACCEPT                      #Totrrents                           

        # ICMP (Povoleni PINGu typ 8 echo , typ 11 time exeeded , typ 0 echo reply , typ destination unreacheble )
        $IPTABLES -A INPUT -i $WAN -p ICMP -s 0/0 ! --icmp-type 8 -j ACCEPT                                      
        #$IPTABLES -A INPUT -i $WAN -p ICMP -s 0/0 --icmp-type 8 -j ACCEPT                                       
                                                                                                                 
        # All packets that do not request a connection can pass                                                  
        $IPTABLES -A INPUT -i $WAN -p TCP ! --syn -j ACCEPT                                             # tcp flags:!0x17/0x02

        # Extremni paranoia
        $IPTABLES -A INPUT -p TCP --dport 0 -j DROP
        $IPTABLES -A INPUT -p UDP --dport 0 -j DROP
        $IPTABLES -A INPUT -p TCP --sport 0 -j DROP
        $IPTABLES -A INPUT -p UDP --sport 0 -j DROP
        $IPTABLES -A FORWARD -p TCP --dport 0 -j DROP
        $IPTABLES -A FORWARD -p UDP --dport 0 -j DROP
        $IPTABLES -A FORWARD -p TCP --sport 0 -j DROP
        $IPTABLES -A FORWARD -p UDP --sport 0 -j DROP
        $IPTABLES -A OUTPUT -p TCP --dport 0 -j DROP
        $IPTABLES -A OUTPUT -p UDP --dport 0 -j DROP
        $IPTABLES -A OUTPUT -p TCP --sport 0 -j DROP
        $IPTABLES -A OUTPUT -p UDP --sport 0 -j DROP


        # ================================================================
        # Maskarada                                                      
        # ================================================================

        # Moduly pro ftp prenosy
        modprobe ip_conntrack_ftp
        modprobe ip_nat_ftp     

        # Zavedeme moduly pro nestandardni cile
        modprobe ipt_LOG                      
        modprobe ipt_REJECT                   
        modprobe ipt_MASQUERADE               

        # Presmerovani mezi sitovkama
        $IPTABLES -I FORWARD -i $WAN -o $LAN -m state --state ESTABLISHED,RELATED -j ACCEPT # mezi inetem a siti
        $IPTABLES -I FORWARD -i $WAN -o $WIFI -m state --state ESTABLISHED,RELATED -j ACCEPT # mezi inetem a wifi
        $IPTABLES -I FORWARD -i $LAN -o $WIFI -m state --state ESTABLISHED,RELATED -j ACCEPT # mezi siti a wifi 
        $IPTABLES -I FORWARD -i $LAN -o $WAN -j ACCEPT                                                          
        $IPTABLES -I FORWARD -i $WIFI -o $WAN -j ACCEPT                                                         
        $IPTABLES -I FORWARD -i $WIFI -o $LAN -j ACCEPT                                                         
        $IPTABLES -t nat -A POSTROUTING -o $WAN -j MASQUERADE                                                   

        # Forwarding on
        echo "1" > /proc/sys/net/ipv4/ip_forward

        # ================================================================

        echo "."
        ;;     


  stop)
        echo -n "Vyprazdneni iptables"

        # ================================================================

        # Forwarding off
        #echo "0" > /proc/sys/net/ipv4/ip_forward

        # Povoleni vseho
        $IPTABLES -P INPUT ACCEPT
        $IPTABLES -P OUTPUT ACCEPT
        $IPTABLES -P FORWARD ACCEPT

        # Vynulovani pravidel
        $IPTABLES -F
        $IPTABLES -t nat -F

        # ================================================================

        echo "."
        ;;


esac

exit 0
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