#!/bin/sh 
#
#  This is automatically generated file. DO NOT MODIFY !
#
#  Firewall Builder  fwb_ipt v5.0.0.3547
#
#  Generated Fri Jun  3 17:29:38 2011 PDT by vadim
#
# files: * fw1.fw /etc/fw1.fw
#
# Compiled for iptables (any version)
#
# This firewall has two interfaces. Eth0 faces outside and has a dynamic address; eth1 faces inside.
# Policy includes basic rules to permit unrestricted outbound access and anti-spoofing rules. Access to the firewall is permitted only from internal network and only using SSH. The firewall uses one of the machines on internal network for DNS. Internal network is configured with address 192.168.1.0/255.255.255.0

# fw1:NAT:8: error: NAT rule can not change service types: TCPService to UDPService
# fw1:NAT:8: error: Translated Service should be either 'Original' or should contain object of the same type as Original Service.

# fw1:Policy:1: error: Rule '1 (global)' shadows rule '2 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '2 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '3 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '3 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '3 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '3 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '4 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '4 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '5 (global)'  below it
# fw1:Policy:1: error: Rule '1 (global)' shadows rule '6 (global)'  below it


FWBDEBUG=""

PATH="/sbin:/usr/sbin:/bin:/usr/bin:${PATH}"
export PATH



LSMOD="/sbin/lsmod"
MODPROBE="/sbin/modprobe"
IPTABLES="/sbin/iptables"
IP6TABLES="/sbin/ip6tables"
IPTABLES_RESTORE="/sbin/iptables-restore"
IP6TABLES_RESTORE="/sbin/ip6tables-restore"
IP="/sbin/ip"
IFCONFIG="/sbin/ifconfig"
VCONFIG="/sbin/vconfig"
BRCTL="/sbin/brctl"
IFENSLAVE="/sbin/ifenslave"
IPSET="/usr/sbin/ipset"
LOGGER="/usr/bin/logger"

log() {
    echo "$1"
    command -v "$LOGGER" >/dev/null 2>&1 && $LOGGER -p info "$1"
}

getInterfaceVarName() {
    echo $1 | sed 's/\./_/'
}

getaddr_internal() {
    dev=$1
    name=$2
    af=$3
    L=$($IP $af addr show dev $dev |  sed -n '/inet/{s!.*inet6* !!;s!/.*!!p}' | sed 's/peer.*//')
    test -z "$L" && { 
        eval "$name=''"
        return
    }
    eval "${name}_list=\"$L\"" 
}

getnet_internal() {
    dev=$1
    name=$2
    af=$3
    L=$($IP route list proto kernel | grep $dev | grep -v default |  sed 's! .*$!!')
    test -z "$L" && { 
        eval "$name=''"
        return
    }
    eval "${name}_list=\"$L\"" 
}


getaddr() {
    getaddr_internal $1 $2 "-4"
}

getaddr6() {
    getaddr_internal $1 $2 "-6"
}

getnet() {
    getnet_internal $1 $2 "-4"
}

getnet6() {
    getnet_internal $1 $2 "-6"
}

# function getinterfaces is used to process wildcard interfaces
getinterfaces() {
    NAME=$1
    $IP link show | grep ": $NAME" | while read L; do
        OIFS=$IFS
        IFS=" :"
        set $L
        IFS=$OIFS
        echo $2
    done
}

diff_intf() {
    func=$1
    list1=$2
    list2=$3
    cmd=$4
    for intf in $list1
    do
        echo $list2 | grep -q $intf || {
        # $vlan is absent in list 2
            $func $intf $cmd
        }
    done
}

find_program() {
  PGM=$1
  command -v $PGM >/dev/null 2>&1 || {
    echo "$PGM not found"
    exit 1
  }
}
check_tools() {
  find_program $IPTABLES 
 find_program $MODPROBE 
  find_program $IP 
}
reset_iptables_v4() {
  $IPTABLES -P OUTPUT  DROP
  $IPTABLES -P INPUT   DROP
  $IPTABLES -P FORWARD DROP

cat /proc/net/ip_tables_names | while read table; do
  $IPTABLES -t $table -L -n | while read c chain rest; do
      if test "X$c" = "XChain" ; then
        $IPTABLES -t $table -F $chain
      fi
  done
  $IPTABLES -t $table -X
done
}

reset_iptables_v6() {
  $IP6TABLES -P OUTPUT  DROP
  $IP6TABLES -P INPUT   DROP
  $IP6TABLES -P FORWARD DROP

cat /proc/net/ip6_tables_names | while read table; do
  $IP6TABLES -t $table -L -n | while read c chain rest; do
      if test "X$c" = "XChain" ; then
        $IP6TABLES -t $table -F $chain
      fi
  done
  $IP6TABLES -t $table -X
done
}


P2P_INTERFACE_WARNING=""

missing_address() {
    address=$1
    cmd=$2

    oldIFS=$IFS
    IFS="@"
    set $address
    addr=$1
    interface=$2
    IFS=$oldIFS



    $IP addr show dev $interface | grep -q POINTOPOINT && {
        test -z "$P2P_INTERFACE_WARNING" && echo "Warning: Can not update address of interface $interface. fwbuilder can not manage addresses of point-to-point interfaces yet"
        P2P_INTERFACE_WARNING="yes"
        return
    }

    test "$cmd" = "add" && {
      echo "# Adding ip address: $interface $addr"
      echo $addr | grep -q ':' && {
          $FWBDEBUG $IP addr $cmd $addr dev $interface
      } || {
          $FWBDEBUG $IP addr $cmd $addr broadcast + dev $interface
      }
    }

    test "$cmd" = "del" && {
      echo "# Removing ip address: $interface $addr"
      $FWBDEBUG $IP addr $cmd $addr dev $interface || exit 1
    }

    $FWBDEBUG $IP link set $interface up
}

list_addresses_by_scope() {
    interface=$1
    scope=$2
    ignore_list=$3
    $IP addr ls dev $interface | \
      awk -v IGNORED="$ignore_list" -v SCOPE="$scope" \
        'BEGIN {
           split(IGNORED,ignored_arr);
           for (a in ignored_arr) {ignored_dict[ignored_arr[a]]=1;}
         }
         (/inet |inet6 / && $0 ~ SCOPE && !($2 in ignored_dict)) {print $2;}' | \
        while read addr; do
          echo "${addr}@$interface"
	done | sort
}


update_addresses_of_interface() {
    ignore_list=$2
    set $1 
    interface=$1 
    shift

    FWB_ADDRS=$(
      for addr in $*; do
        echo "${addr}@$interface"
      done | sort
    )

    CURRENT_ADDRS_ALL_SCOPES=""
    CURRENT_ADDRS_GLOBAL_SCOPE=""

    $IP link show dev $interface >/dev/null 2>&1 && {
      CURRENT_ADDRS_ALL_SCOPES=$(list_addresses_by_scope $interface 'scope .*' "$ignore_list")
      CURRENT_ADDRS_GLOBAL_SCOPE=$(list_addresses_by_scope $interface 'scope global' "$ignore_list")
    } || {
      echo "# Interface $interface does not exist"
      # Stop the script if we are not in test mode
      test -z "$FWBDEBUG" && exit 1
    }

    diff_intf missing_address "$FWB_ADDRS" "$CURRENT_ADDRS_ALL_SCOPES" add
    diff_intf missing_address "$CURRENT_ADDRS_GLOBAL_SCOPE" "$FWB_ADDRS" del
}

clear_addresses_except_known_interfaces() {
    $IP link show | sed 's/://g' | awk -v IGNORED="$*" \
        'BEGIN {
           split(IGNORED,ignored_arr);
           for (a in ignored_arr) {ignored_dict[ignored_arr[a]]=1;}
         }
         (/state/ && !($2 in ignored_dict)) {print $2;}' | \
         while read intf; do
            echo "# Removing addresses not configured in fwbuilder from interface $intf"
            $FWBDEBUG $IP addr flush dev $intf scope global
            $FWBDEBUG $IP link set $intf down
         done
}

check_file() {
    test -r "$2" || {
        echo "Can not find file $2 referenced by address table object $1"
        exit 1
    }
}

check_run_time_address_table_files() {
    :
    
}

load_modules() {
    :
    OPTS=$1
    MODULES_DIR="/lib/modules/`uname -r`/kernel/net/"
    MODULES=$(find $MODULES_DIR -name '*conntrack*' \! -name '*ipv6*'|sed  -e 's/^.*\///' -e 's/\([^\.]\)\..*/\1/')
    echo $OPTS | grep -q nat && {
        MODULES="$MODULES $(find $MODULES_DIR -name '*nat*'|sed  -e 's/^.*\///' -e 's/\([^\.]\)\..*/\1/')"
    }
    echo $OPTS | grep -q ipv6 && {
        MODULES="$MODULES $(find $MODULES_DIR -name nf_conntrack_ipv6|sed  -e 's/^.*\///' -e 's/\([^\.]\)\..*/\1/')"
    }
    for module in $MODULES; do 
        if $LSMOD | grep ${module} >/dev/null; then continue; fi
        $MODPROBE ${module} ||  exit 1 
    done
}

verify_interfaces() {
    :
    echo "Verifying interfaces: eth0 eth1 lo"
    for i in eth0 eth1 lo ; do
        $IP link show "$i" > /dev/null 2>&1 || {
            log "Interface $i does not exist"
            exit 1
        }
    done
}

prolog_commands() {
    echo "Running prolog script"
    
}

epilog_commands() {
    echo "Running epilog script"
    
}

run_epilog_and_exit() {
    epilog_commands
    exit $1
}

configure_interfaces() {
    :
    # Configure interfaces
    update_addresses_of_interface "eth0 192.0.2.1/24" ""
    update_addresses_of_interface "eth1 fe80::21d:9ff:fe8b:8e94/64 192.168.1.1/24" ""
    update_addresses_of_interface "lo 127.0.0.1/8" ""
}

script_body() {
    # ================ IPv4


    # ================ Table 'filter', automatic rules
    # accept established sessions
    $IPTABLES -A INPUT   -m state --state ESTABLISHED,RELATED -j ACCEPT 
    $IPTABLES -A OUTPUT  -m state --state ESTABLISHED,RELATED -j ACCEPT 
    $IPTABLES -A FORWARD -m state --state ESTABLISHED,RELATED -j ACCEPT


    # ================ Table 'nat',  rule set NAT
    # 
    # Rule 0 (NAT)
    # 
    echo "Rule 0 (NAT)"
    # 
    $IPTABLES -t nat -A POSTROUTING  -s 192.168.1.0/24  -j ACCEPT
    $IPTABLES -t nat -A PREROUTING  -s 192.168.1.0/24  -j ACCEPT
    # 
    # Rule 1 (NAT)
    # 
    echo "Rule 1 (NAT)"
    # 
    # source port only
    $IPTABLES -t nat -A POSTROUTING -o eth+  -p udp -m udp  -s 192.168.1.0/24  --sport 123  -j SNAT --to-source :5050
    # 
    # Rule 2 (NAT)
    # 
    echo "Rule 2 (NAT)"
    # 
    # dest port only
    $IPTABLES -t nat -A PREROUTING -p udp -m udp  -s 192.168.1.0/24   --dport 53 -j DNAT --to-destination :1053
    # 
    # Rule 3 (NAT)
    # 
    echo "Rule 3 (NAT)"
    # 
    # SDNAT 
    $IPTABLES -t nat -A PREROUTING -p tcp -m tcp   -d 192.0.2.1  --dport 22 -j DNAT --to-destination 192.168.1.10
    $IPTABLES -t nat -A PREROUTING -p tcp -m tcp   -d 192.168.1.1  --dport 22 -j DNAT --to-destination 192.168.1.10
    $IPTABLES -t nat -A POSTROUTING -o eth1  -p tcp -m tcp   -d 192.168.1.10  --dport 22 -j SNAT --to-source 192.168.1.1
    # 
    # Rule 4 (NAT)
    # 
    echo "Rule 4 (NAT)"
    # 
    # SDNAT with source port
    $IPTABLES -t nat -A PREROUTING -p udp -m udp  --sport 123  -d 192.0.2.1  -j DNAT --to-destination 192.168.1.10
    $IPTABLES -t nat -A PREROUTING -p udp -m udp  --sport 123  -d 192.168.1.1  -j DNAT --to-destination 192.168.1.10
    $IPTABLES -t nat -A POSTROUTING -o eth1  -p udp -m udp  --sport 123  -d 192.168.1.10  -j SNAT --to-source 192.168.1.1:5050
    # 
    # Rule 5 (NAT)
    # 
    echo "Rule 5 (NAT)"
    # 
    # SDNAT with dest port
    $IPTABLES -t nat -A PREROUTING -p udp -m udp  -s 192.168.1.0/24   --dport 53 -j DNAT --to-destination 192.168.1.10:1053
    $IPTABLES -t nat -A POSTROUTING -o eth1  -p udp -m udp  -s 192.168.1.0/24   -d 192.168.1.10  --dport 1053 -j SNAT --to-source 192.168.1.1
    # 
    # Rule 6 (NAT)
    # 
    echo "Rule 6 (NAT)"
    # 
    # SDNAT
    # translate src and dst addresses
    # and src and dst ports
    $IPTABLES -t nat -A PREROUTING -p udp -m udp  -s 192.168.1.0/24  --sport 1024:65535  --dport 53 -j DNAT --to-destination 192.168.1.10:1053
    $IPTABLES -t nat -A POSTROUTING -o eth1  -p udp -m udp  -s 192.168.1.0/24   -d 192.168.1.10  --dport 1053 -j SNAT --to-source 192.168.1.1:32767-65535
    # 
    # Rule 7 (NAT)
    # 
    echo "Rule 7 (NAT)"
    # 
    $IPTABLES -t nat -A POSTROUTING -o eth+  -p udp -m udp  -s 192.168.1.0/24   --dport 53 -j SNAT --to-source :5050



    # ================ Table 'filter', rule set Policy
    # 
    # Rule 0 (global)
    # 
    echo "Rule 0 (global)"
    # 
    # anti spoofing rule
    $IPTABLES -N Cid45745X95438.0
    $IPTABLES -A FORWARD -i +   -d 192.168.171.2   -m state --state NEW  -j Cid45745X95438.0
    $IPTABLES -N In_RULE_0
    $IPTABLES -A Cid45745X95438.0  -s 192.0.2.1   -j In_RULE_0
    $IPTABLES -A Cid45745X95438.0  -s 192.168.1.1   -j In_RULE_0
    $IPTABLES -A FORWARD -i +   -s 192.168.1.0/24   -d 192.168.171.2   -m state --state NEW  -j In_RULE_0
    $IPTABLES -A In_RULE_0  -j LOG  --log-level info --log-prefix "RULE 0 -- DENY "
    $IPTABLES -A In_RULE_0  -j DROP
    # 
    # Rule 1 (global)
    # 
    echo "Rule 1 (global)"
    # 
    # fw1:Policy:1: error: Rule '1 (global)' shadows rule '2 (global)'  below it
    # fw1:Policy:1: error: Rule '1 (global)' shadows rule '3 (global)'  below it
    # fw1:Policy:1: error: Rule '1 (global)' shadows rule '4 (global)'  below it
    # fw1:Policy:1: error: Rule '1 (global)' shadows rule '5 (global)'  below it
    # fw1:Policy:1: error: Rule '1 (global)' shadows rule '6 (global)'  below it

    $IPTABLES -A OUTPUT  -m state --state NEW  -j ACCEPT
    $IPTABLES -A INPUT  -m state --state NEW  -j ACCEPT
    $IPTABLES -A FORWARD  -m state --state NEW  -j ACCEPT
    # 
    # Rule 2 (global)
    # 
    echo "Rule 2 (global)"
    # 
    # SSH Access to firewall is permitted
    # only from internal network
    $IPTABLES -A INPUT -p tcp -m tcp  -s 192.168.1.0/24   --dport 22  -m state --state NEW  -j ACCEPT
    # 
    # Rule 3 (global)
    # 
    echo "Rule 3 (global)"
    # 
    # Firewall uses one of the machines
    # on internal network for DNS
    $IPTABLES -N RULE_3
    $IPTABLES -A OUTPUT -p tcp -m tcp  -d 192.168.1.0/24   --dport 53  -m state --state NEW  -j RULE_3
    $IPTABLES -A OUTPUT -p udp -m udp  -d 192.168.1.0/24   --dport 53  -m state --state NEW  -j RULE_3
    $IPTABLES -A RULE_3  -j LOG  --log-level info --log-prefix "RULE 3 -- ACCEPT "
    $IPTABLES -A RULE_3  -j ACCEPT
    # 
    # Rule 4 (global)
    # 
    echo "Rule 4 (global)"
    # 
    # All other attempts to connect to
    # the firewall are denied and logged
    $IPTABLES -N RULE_4
    $IPTABLES -A OUTPUT  -d 192.0.2.1   -m state --state NEW  -j RULE_4
    $IPTABLES -A OUTPUT  -d 192.168.1.1   -m state --state NEW  -j RULE_4
    $IPTABLES -A INPUT  -m state --state NEW  -j RULE_4
    $IPTABLES -A RULE_4  -j LOG  --log-level info --log-prefix "RULE 4 -- DENY "
    $IPTABLES -A RULE_4  -j DROP
    # 
    # Rule 5 (global)
    # 
    echo "Rule 5 (global)"
    # 
    $IPTABLES -A INPUT -p tcp -m tcp  -s 192.168.1.0/24   --dport 1   --tcp-flags SYN SYN  -m state --state NEW  -j ACCEPT
    $IPTABLES -A OUTPUT -p tcp -m tcp  -s 192.168.1.0/24   --dport 1   --tcp-flags SYN SYN  -m state --state NEW  -j ACCEPT
    $IPTABLES -A FORWARD -p tcp -m tcp  -s 192.168.1.0/24   --dport 1   --tcp-flags SYN SYN  -m state --state NEW  -j ACCEPT
    # 
    # Rule 6 (global)
    # 
    echo "Rule 6 (global)"
    # 
    $IPTABLES -N RULE_6
    $IPTABLES -A OUTPUT -p tcp -m tcp  -j RULE_6
    $IPTABLES -A INPUT -p tcp -m tcp  -j RULE_6
    $IPTABLES -A FORWARD -p tcp -m tcp  -j RULE_6
    $IPTABLES -A RULE_6  -j LOG  --log-level info --log-prefix "RULE 6 -- REJECT "
    $IPTABLES -A RULE_6 -p tcp -m tcp  -j REJECT  --reject-with tcp-reset
    $IPTABLES -A OUTPUT  -j RULE_6
    $IPTABLES -A INPUT  -j RULE_6
    $IPTABLES -A FORWARD  -j RULE_6
    $IPTABLES -A RULE_6  -j REJECT
}

ip_forward() {
    :
    echo 1 > /proc/sys/net/ipv4/ip_forward
}

reset_all() {
    :
    reset_iptables_v4
}

block_action() {
    reset_all
}

stop_action() {
    reset_all
    $IPTABLES -P OUTPUT  ACCEPT
    $IPTABLES -P INPUT   ACCEPT
    $IPTABLES -P FORWARD ACCEPT
}

check_iptables() {
    IP_TABLES="$1"
    [ ! -e $IP_TABLES ] && return 151
    NF_TABLES=$(cat $IP_TABLES 2>/dev/null)
    [ -z "$NF_TABLES" ] && return 152
    return 0
}
status_action() {
    check_iptables "/proc/net/ip_tables_names"
    ret_ipv4=$?
    check_iptables "/proc/net/ip6_tables_names"
    ret_ipv6=$?
    [ $ret_ipv4 -eq 0 -o $ret_ipv6 -eq 0 ] && return 0
    [ $ret_ipv4 -eq 151 -o $ret_ipv6 -eq 151 ] && {
        echo "iptables modules are not loaded"
    }
    [ $ret_ipv4 -eq 152 -o $ret_ipv6 -eq 152 ] && {
        echo "Firewall is not configured"
    }
    exit 3
}

# See how we were called.
# For backwards compatibility missing argument is equivalent to 'start'

cmd=$1
test -z "$cmd" && {
    cmd="start"
}

case "$cmd" in
    start)
        log "Activating firewall script generated Fri Jun  3 17:29:38 2011 by vadim"
        check_tools
         prolog_commands 
        check_run_time_address_table_files
        
        load_modules "nat "
        configure_interfaces
        verify_interfaces
        
         reset_all 
        
        script_body
        ip_forward
        epilog_commands
        RETVAL=$?
        ;;

    stop)
        stop_action
        RETVAL=$?
        ;;

    status)
        status_action
        RETVAL=$?
        ;;

    block)
        block_action
        RETVAL=$?
        ;;

    reload)
        $0 stop
        $0 start
        RETVAL=$?
        ;;

    interfaces)
        configure_interfaces
        RETVAL=$?
        ;;

    test_interfaces)
        FWBDEBUG="echo"
        configure_interfaces
        RETVAL=$?
        ;;



    *)
        echo "Usage $0 [start|stop|status|block|reload|interfaces|test_interfaces]"
        ;;

esac

exit $RETVAL