#!/bin/sh # # The Shoreline Firewall (Shorewall) Packet Filtering Firewall - V1.4 3/14/2003 # # This program is under GPL [http://www.gnu.org/copyleft/gpl.htm] # # (c) 1999,2000,2001,2002,2003 - Tom Eastep (teastep@shorewall.net) # # On most distributions, this file should be called: # /etc/rc.d/init.d/shorewall or /etc/init.d/shorewall # # Complete documentation is available at http://shorewall.net # # This program is free software; you can redistribute it and/or modify # it under the terms of Version 2 of the GNU General Public License # as published by the Free Software Foundation. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA # # If an error occurs while starting or restarting the firewall, the # firewall is automatically stopped. # # Commands are: # # shorewall start Starts the firewall # shorewall restart Restarts the firewall # shorewall stop Stops the firewall # shorewall status Displays firewall status # shorewall reset Resets iptabless packet and # byte counts # shorewall clear Remove all Shorewall chains # and rules/policies. # shorewall refresh . Rebuild the common chain # shorewall check Verify the more heavily-used # configuration files. # # Search a list looking for a match -- returns zero if a match found # 1 otherwise # list_search() # $1 = element to search for , $2-$n = list { local e=$1 while [ $# -gt 1 ]; do shift [ "x$e" = "x$1" ] && return 0 done return 1 } # # Function to count list elements # list_count() { arg_count() { echo $# } arg_count `separate_list $1` } # # Mutual exclusion -- These functions are jackets for the mutual exclusion # routines in $FUNCTIONS. They invoke # the corresponding function in that file if the user did # not specify "nolock" on the runline. # my_mutex_on() { [ -n "$nolock" ] || { mutex_on; have_mutex=Yes; } } my_mutex_off() { [ -n "$have_mutex" ] && { mutex_off; have_mutex=; } } # # Message to stderr # error_message() # $* = Error Message { echo " $@" >&2 } # # Fatal error -- stops the firewall after issuing the error message # fatal_error() # $* = Error Message { echo " Error: $@" >&2 if [ $command = check ]; then [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR else stop_firewall fi exit 2 } # # Fatal error during startup -- generate an error message and abend with # altering the state of the firewall # startup_error() # $* = Error Message { echo " Error: $@" >&2 my_mutex_off [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR kill $$ exit 2 } # # Send a message to STDOUT and the System Log # report () { # $* = message echo "$@" logger "$@" } # # Perform variable substitution on the passed argument and echo the result # expand() # $1 = contents of variable which may be the name of another variable { eval echo \"$1\" } # # Perform variable substitition on the values of the passed list of variables # expandv() # $* = list of variable names { local varval while [ $# -gt 0 ]; do eval varval=\$${1} eval $1=\"$varval\" shift done } # # Replace all leading "!" with "! " in the passed argument list # fix_bang() { local i; for i in $@; do case $i in !*) echo "! ${i#!}" ;; *) echo $i ;; esac done } # # Run iptables and if an error occurs, stop the firewall and quit # run_iptables() { if ! iptables $@ ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi } # # Version of 'run_iptables' that inserts white space after "!" in the arg list # run_iptables2() { if [ "x${*%!*}" = "x$*" ]; then # # No "!" in the command -- just execute it # run_iptables $@ return fi # # Need to insert white space before each "!" # run_iptables `fix_bang $@` } # # Run ip and if an error occurs, stop the firewall and quit # run_ip() { if ! ip $@ ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi } # # Run arp and if an error occurs, stop the firewall and quit # run_arp() { if ! arp $@ ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi } # # Run tc and if an error occurs, stop the firewall and quit # run_tc() { if ! tc $@ ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi } # # Create a filter chain # # If the chain isn't one of the common chains then add a rule to the chain # allowing packets that are part of an established connection. Create a # variable ${1}_exists and set its value to Yes to indicate that the chain now # exists. # createchain() # $1 = chain name, $2 = If "yes", create default rules { run_iptables -N $1 if [ $2 = yes ]; then run_iptables -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT [ -z "$NEWNOTSYN" ] && \ run_iptables -A $1 -m state --state NEW -p tcp ! --syn -j newnotsyn fi eval ${1}_exists=Yes } # # Determine if a chain exists # # When we create a chain "chain", we create a variable named chain_exists and # set its value to Yes. This function tests for the "_exists" variable # corresponding to the passed chain having the value of "Yes". # havechain() # $1 = name of chain { eval test \"\$${1}_exists\" = Yes } # # Query NetFilter about the existence of a filter chain # chain_exists() # $1 = chain name { qt iptables -L $1 -n } # # Query NetFilter about the existence of a mangle chain # mangle_chain_exists() # $1 = chain name { qt iptables -t mangle -L $1 -n } # # Ensure that a chain exists (create it if it doesn't) # ensurechain() # $1 = chain name { havechain $1 || createchain $1 yes } # # Add a rule to a chain creating the chain if necessary # addrule() # $1 = chain name, remainder of arguments specify the rule { ensurechain $1 run_iptables -A $@ } # # Create a nat chain # # Create a variable ${1}_nat_exists and set its value to Yes to indicate that # the chain now exists. # createnatchain() # $1 = chain name { run_iptables -t nat -N $1 eval ${1}_nat_exists=Yes } # # Determine if a nat chain exists # # When we create a chain "chain", we create a variable named chain_nat_exists # and set its value to Yes. This function tests for the "_exists" variable # corresponding to the passed chain having the value of "Yes". # havenatchain() # $1 = name of chain { eval test \"\$${1}_nat_exists\" = Yes } # # Ensure that a nat chain exists (create it if it doesn't) # ensurenatchain() # $1 = chain name { havenatchain $1 || createnatchain $1 } # # Add a rule to a nat chain creating the chain if necessary # addnatrule() # $1 = chain name, remainder of arguments specify the rule { ensurenatchain $1 run_iptables2 -t nat -A $@ } # # Delete a chain if it exists # deletechain() # $1 = name of chain { qt iptables -L $1 -n && qt iptables -F $1 && qt iptables -X $1 } # # Determine if a chain is a policy chain # is_policy_chain() # $1 = name of chain { eval test \"\$${1}_is_policy\" = Yes } # # Set a standard chain's policy # setpolicy() # $1 = name of chain, $2 = policy { run_iptables -P $1 $2 } # # Set a standard chain to enable established and related connections # setcontinue() # $1 = name of chain { run_iptables -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT } # # Flush one of the NAT table chains # flushnat() # $1 = name of chain { run_iptables -t nat -F $1 } # # Flush one of the Mangle table chains # flushmangle() # $1 = name of chain { run_iptables -t mangle -F $1 } # # Chain name base for an interface # chain_base() #$1 = interface { local c=${1%%+*} case $c in *.*) echo ${c%.*}_${c#*.} ;; *) echo ${c:=common} ;; esac } # # Find interfaces to a given zone # # Search the variables representing the contents of the interfaces file and # for each record matching the passed ZONE, echo the expanded contents of # the "INTERFACE" column # find_interfaces() # $1 = interface zone { local zne=$1 local z local interface for interface in $all_interfaces; do eval z=\$`chain_base ${interface}`_zone [ "x${z}" = x${zne} ] && echo $interface done } # # Forward Chain for an interface # forward_chain() # $1 = interface { echo `chain_base $1`_fwd } # # Input Chain for an interface # input_chain() # $1 = interface { echo `chain_base $1`_in } # # Output Chain for an interface # output_chain() # $1 = interface { echo `chain_base $1`_out } # # Masquerade Chain for an interface # masq_chain() # $1 = interface { echo `chain_base $1`_masq } # # MAC Verification Chain for an interface # mac_chain() # $1 = interface { echo `chain_base $1`_mac } # # DNAT Chain from a zone # dnat_chain() # $1 = zone { echo ${1}_dnat } # # SNAT Chain to a zone # snat_chain() # $1 = zone { echo `chain_base $1`_snat } # # ECN Chain to an interface # ecn_chain() # $1 = interface { echo ${1}_ecn } # # First chains for an interface # first_chains() #$1 = interface { local c=`chain_base $1` echo ${c}_fwd ${c}_in } # # Find hosts in a given zone # # Read hosts file and for each record matching the passed ZONE, # echo the expanded contents of the "HOST(S)" column # find_hosts() # $1 = host zone { local hosts while read z hosts options; do [ "x`expand $z`" = "x$1" ] && expandv hosts && echo `separate_list $hosts` done < $TMP_DIR/hosts } # # Determine the interfaces on the firewall # # For each zone, create a variable called ${zone}_interfaces. This # variable contains a space-separated list of interfaces to the zone # determine_interfaces() { for zone in $zones; do interfaces=`find_interfaces $zone` interfaces=`echo $interfaces` # Remove extra trash eval ${zone}_interfaces=\"\$interfaces\" done } # # Determine the defined hosts in each zone and generate report # determine_hosts() { for zone in $zones; do hosts=`find_hosts $zone` hosts=`echo $hosts` # Remove extra trash eval interfaces=\$${zone}_interfaces for interface in $interfaces; do if [ -z "$hosts" ]; then hosts=$interface:0.0.0.0/0 else hosts="$hosts $interface:0.0.0.0/0" fi done interfaces= for host in $hosts; do interface=${host%:*} if ! list_search $interface $interfaces; then if [ -z "$interfaces" ]; then interfaces=$interface else interfaces="$interfaces $interface" fi fi [ "${host#*:}" = "0.0.0.0/0" ] || \ eval ${zone}_is_complex=Yes done eval ${zone}_interfaces="\$interfaces" eval ${zone}_hosts="\$hosts" if [ -n "$hosts" ]; then eval display=\$${zone}_display display_list "$display Zone:" $hosts else error_message "Warning: Zone $zone is empty" fi done } # # Ensure that the passed zone is defined in the zones file or is the firewall # validate_zone() # $1 = zone { list_search $1 $zones $FW } # # Validate the zone names and options in the interfaces file # validate_interfaces_file() { while read z interface subnet options; do expandv z interface subnet options r="$z $interface $subnet $options" [ "x$z" = "x-" ] && z= if [ -n "$z" ]; then validate_zone $z || startup_error "Invalid zone ($z) in record \"$r\"" fi if [ -n "`ip link show $interface 2> /dev/null | grep LOOPBACK`" ]; then startup_error "The loopback interface ($interface) may not be defined in /etc/shorewall/interfaces" fi list_search $interface $all_interfaces && \ startup_error "Duplicate Interface $interface" case $interface in *:*) startup_error "Invalid Interface Name: $interface" ;; esac all_interfaces="$all_interfaces $interface" options=`separate_list $options` interface=`chain_base $interface` eval ${interface}_broadcast="$subnet" eval ${interface}_zone="$z" eval ${interface}_options=\"$options\" for option in $options; do case $option in dhcp|norfc1918|tcpflags|newnotsyn) ;; routefilter|dropunclean|logunclean|blacklist|proxyarp|maclist|-) ;; routeback) [ -n "$z" ] || startup_error "The routeback option may not be specified on a multi-zone interface" eval ${z}_routeback=\"$interface:0.0.0.0/0 \$${z}_routeback\" ;; *) error_message "Warning: Invalid option ($option) in record \"$r\"" ;; esac done [ -z "$all_interfaces" ] && startup_error "No Interfaces Defined" done < $TMP_DIR/interfaces } # # Validate the zone names and options in the hosts file # validate_hosts_file() { while read z hosts options; do expandv z hosts options r="$z $hosts $options" validate_zone $z || startup_error "Invalid zone ($z) in record \"$r\"" for host in `separate_list $hosts`; do interface=${host%:*} list_search $interface $all_interfaces || \ startup_error "Unknown interface ($interface) in record \"$r\"" for option in `separate_list $options`; do case $option in maclist|-) ;; routeback) eval ${z}_routeback=\"$host \$${z}_routeback\" ;; *) error_message "Warning: Invalid option ($option) in record \"$r\"" ;; esac done done done < $TMP_DIR/hosts } # # Format a match by the passed MAC address # The passed address begins with "~" and uses "-" as a separator between bytes # Example: ~01-02-03-04-05-06 # mac_match() # $1 = MAC address formated as described above { echo "--match mac --mac-source `echo $1 | sed 's/~//;s/-/:/g'`" } # # validate the policy file # validate_policy() { local clientwild local serverwild local zone local zone1 local pc local chain local policy local loglevel local synparams print_policy() # $1 = source zone, $2 = destination zone { [ $command != check ] || \ [ $1 = $2 ] || \ [ $1 = all ] || \ [ $2 = all ] || \ echo " Policy for $1 to $2 is $policy" } all_policy_chains= strip_file policy while read client server policy loglevel synparams; do expandv client server policy loglevel synparams clientwild= serverwild= case "$client" in all|ALL) clientwild=Yes ;; *) if ! validate_zone $client; then startup_error "Undefined zone $client" fi esac case "$server" in all|ALL) serverwild=Yes ;; *) if ! validate_zone $server; then startup_error "Undefined zone $server" fi esac case $policy in ACCEPT|REJECT|DROP|CONTINUE|NONE) ;; *) startup_error "Invalid policy $policy" ;; esac chain=${client}2${server} [ "x$chain" = "x${FW}2${FW}" ] && \ startup_error "fw->fw policy not allowed: $policy" if is_policy_chain $chain ; then startup_error "Duplicate policy $policy" fi [ "x$loglevel" = "x-" ] && loglevel= chain=${client}2${server} [ $policy = NONE ] || all_policy_chains="$all_policy_chains $chain" eval ${chain}_is_policy=Yes eval ${chain}_policy=$policy eval ${chain}_loglevel=$loglevel eval ${chain}_synparams=$synparams if [ -n "${clientwild}" ]; then if [ -n "${serverwild}" ]; then for zone in $zones $FW all; do for zone1 in $zones $FW all; do eval pc=\$${zone}2${zone1}_policychain if [ -z "$pc" ]; then eval ${zone}2${zone1}_policychain=$chain eval ${zone}2${zone1}_policy=$policy print_policy $zone $zone1 fi done done else for zone in $zones $FW all; do eval pc=\$${zone}2${server}_policychain if [ -z "$pc" ]; then eval ${zone}2${server}_policychain=$chain eval ${zone}2${server}_policy=$policy print_policy $zone $server fi done fi elif [ -n "$serverwild" ]; then for zone in $zones $FW all; do eval pc=\$${client}2${zone}_policychain if [ -z "$pc" ]; then eval ${client}2${zone}_policychain=$chain eval ${client}2${zone}_policy=$policy print_policy $client $zone fi done else eval ${chain}_policychain=${chain} print_policy $client $server fi done < $TMP_DIR/policy } # # Find broadcast addresses # find_broadcasts() { for interface in $all_interfaces; do eval bcast=\$`chain_base $interface`_broadcast if [ "x$bcast" = "xdetect" ]; then addr="`ip addr show $interface 2> /dev/null`" if [ -n "`echo "$addr" | grep 'inet.*brd '`" ]; then addr="`echo "$addr" | \ grep "inet " | sed 's/^.* inet.*brd //;s/scope.*//'`" echo $addr | cut -d' ' -f 1 fi elif [ "x${bcast}" != "x-" ]; then echo `separate_list $bcast` fi done } # # Find interface address--returns the first IP address assigned to the passed # device # find_interface_address() # $1 = interface { # # get the line of output containing the first IP address # addr=`ip addr show $1 2> /dev/null | grep inet | head -n1` # # If there wasn't one, bail out now # [ -n "$addr" ] || fatal_error "Can't determine the IP address of $1" # # Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link) # along with everything else on the line # echo $addr | sed 's/inet //;s/\/.*//;s/ peer.*//' } # # Find interface addresses--returns the set of addresses assigned to the passed # device # find_interface_addresses() # $1 = interface { ip addr show $1 | grep inet | sed 's/inet //;s/\/.*//;s/ peer.*//' } # # Find interfaces that have the passed option specified # find_interfaces_by_option() # $1 = option { for interface in $all_interfaces; do eval options=\$`chain_base ${interface}`_options list_search $1 $options && echo $interface done } # # Find hosts with the passed option # find_hosts_by_option() # $1 = option { while read ignore hosts options; do expandv options list_search $1 `separate_list $options` && \ echo `expand $hosts` done < $TMP_DIR/hosts for interface in $all_interfaces; do eval options=\$`chain_base ${interface}`_options list_search $1 $options && \ echo ${interface}:0.0.0.0/0 done } # # Determine if there are interfaces of the given zone and option # # Returns zero if any such interfaces are found and returns one otherwise. # have_interfaces_in_zone_with_option() # $1 = zone, $2 = option { local zne=$1 local z local interface for interface in $all_interfaces; do eval z=\$`chain_base ${interface}`_zone [ "x$z" = "x$zne" ] && \ list_search $1 $options && \ return 0 done return 1 } # # Flush and delete all user-defined chains in the filter table # deleteallchains() { run_iptables -F run_iptables -X } # # Source a user exit file if it exists # run_user_exit() # $1 = file name { local user_exit=`find_file $1` if [ -f $user_exit ]; then echo "Processing $user_exit ..." . $user_exit fi } # # Add a logging rule. # log_rule() # $1 = log level, $2 = chain, $3 = disposition , $... = predicates for the rule { local level=$1 local chain=$2 local disposition=$3 local rulenum= shift;shift;shift if [ -n "$LOGRULENUMBERS" ]; then eval rulenum=\$${chain}_logrules [ -z "$rulenum" ] && rulenum=1 case $level in ULOG) eval iptables -A $chain $@ -j ULOG $LOGPARMS --ulog-prefix '"`printf "$LOGFORMAT" $chain $rulenum $disposition`"' ;; *) eval iptables -A $chain $@ -j LOG $LOGPARMS --log-level $level --log-prefix '"`printf "$LOGFORMAT" $chain $rulenum $disposition`"' ;; esac if [ $? -ne 0 ] ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi rulenum=$(($rulenum + 1)) eval ${chain}_logrules=$rulenum else case $level in ULOG) eval iptables -A $chain $@ -j ULOG $LOGPARMS --ulog-prefix '"`printf "$LOGFORMAT" $chain $disposition`"' ;; *) eval iptables -A $chain $@ -j LOG $LOGPARMS --log-level $level --log-prefix '"`printf "$LOGFORMAT" $chain $disposition`"' ;; esac if [ $? -ne 0 ] ; then [ -z "$stopping" ] && { stop_firewall; exit 2; } fi fi } # # Stop the Firewall # stop_firewall() { # # Turn off trace unless we were tracing "stop" or "clear" # case $command in stop|clear) ;; check) kill $$ exit 2 ;; *) set +x ;; esac stopping="Yes" terminator= deletechain shorewall run_user_exit stop [ -n "$MANGLE_ENABLED" ] && \ run_iptables -t mangle -F && \ run_iptables -t mangle -X [ -n "$NAT_ENABLED" ] && delete_nat delete_proxy_arp [ -n "$CLEAR_TC" ] && delete_tc setpolicy INPUT DROP setpolicy OUTPUT DROP setpolicy FORWARD DROP deleteallchains hosts= strip_file routestopped while read interface host; do expandv interface host [ "x$host" = "x-" -o -z "$host" ] && host=0.0.0.0/0 for h in `separate_list $host`; do hosts="$hosts $interface:$h" done done < $TMP_DIR/routestopped for host in $hosts; do interface=${host%:*} subnet=${host#*:} iptables -A INPUT -i $interface -s $subnet -j ACCEPT iptables -A OUTPUT -o $interface -d $subnet -j ACCEPT for host1 in $hosts; do [ "$host" != "$host1" ] && \ iptables -A FORWARD -i $interface -s $subnet \ -o ${host1%:*} -d ${host1#*:} -j ACCEPT done done iptables -A INPUT -i lo -j ACCEPT iptables -A OUTPUT -o lo -j ACCEPT for interface in `find_interfaces_by_option dhcp`; do iptables -A INPUT -p udp -i $interface --dport 67:68 -j ACCEPT iptables -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT done case "$IP_FORWARDING" in [Oo][Nn]) echo 1 > /proc/sys/net/ipv4/ip_forward ;; [Oo][Ff][Ff]) echo 0 > /proc/sys/net/ipv4/ip_forward ;; esac run_user_exit stopped logger "Shorewall Stopped" rm -rf $TMP_DIR case $command in stop|clear) ;; *) # # The firewall is being stopped when we were trying to do something # else. Remove the lock file and Kill the shell in case we're in a # subshell # my_mutex_off kill $$ ;; esac } # # Remove all rules and remove all user-defined chains # clear_firewall() { stop_firewall run_iptables -F echo 1 > /proc/sys/net/ipv4/ip_forward setpolicy INPUT ACCEPT setpolicy FORWARD ACCEPT setpolicy OUTPUT ACCEPT run_user_exit clear logger "Shorewall Cleared" } # # Set up ipsec tunnels # setup_tunnels() # $1 = name of tunnels file { local inchain local outchain setup_one_ipsec() # $1 = gateway $2 = Tunnel Kind $3 = gateway zones { options="-m state --state NEW -j ACCEPT" addrule $inchain -p 50 -s $1 -j ACCEPT addrule $outchain -p 50 -d $1 -j ACCEPT run_iptables -A $inchain -p 51 -s $1 -j ACCEPT run_iptables -A $outchain -p 51 -d $1 -j ACCEPT run_iptables -A $outchain -p udp -d $1 --dport 500 --sport 500 $options if [ $2 = ipsec ]; then run_iptables -A $inchain -p udp -s $1 --sport 500 --dport 500 $options else run_iptables -A $inchain -p udp -s $1 --dport 500 $options run_iptables -A $inchain -p udp -s $1 --dport 4500 $options fi for z in `separate_list $3`; do if validate_zone $z; then addrule ${FW}2${z} -p udp --sport 500 --dport 500 $options if [ $2 = ipsec ]; then addrule ${z}2${FW} -p udp --sport 500 --dport 500 $options else addrule ${z}2${FW} -p udp --dport 500 $options addrule ${z}2${FW} -p udp --dport 4500 $options fi else error_message "Warning: Invalid gateway zone ($z)" \ " -- Tunnel \"$tunnel\" may encounter keying problems" fi done echo " IPSEC tunnel to $gateway defined." } setup_one_other() # $1 = TYPE, $2 = gateway, $3 = protocol { addrule $inchain -p $3 -s $2 -j ACCEPT addrule $outchain -p $3 -d $2 -j ACCEPT echo " $1 tunnel to $2 defined." } setup_pptp_client() # $1 = gateway { addrule $outchain -p 47 -d $1 -j ACCEPT addrule $inchain -p 47 -j ACCEPT addrule $outchain -p tcp --dport 1723 -d $1 -j ACCEPT echo " PPTP tunnel to $1 defined." } setup_pptp_server() { addrule $inchain -p 47 -j ACCEPT addrule $outchain -p 47 -j ACCEPT addrule $inchain -p tcp --dport 1723 -j ACCEPT echo " PPTP server defined." } setup_one_openvpn() # $1 = gateway, $2 = kind[:port] { case $2 in *:*) p=${2#*:} ;; *) p=5000 ;; esac addrule $inchain -p udp -s $1 --sport $p --dport $p -j ACCEPT addrule $outchain -p udp -d $1 --sport $p --dport $p -j ACCEPT echo " OPENVPN tunnel to $1:$p defined." } strip_file tunnels $1 while read kind z gateway z1; do expandv kind z gateway z1 tunnel="`echo $kind $z $gateway $z1`" if validate_zone $z; then inchain=${z}2${FW} outchain=${FW}2${z} case $kind in ipsec|IPSEC) setup_one_ipsec $gateway ipsec $z1 ;; ipsecnat|IPSECNAT) setup_one_ipsec $gateway ipsecnat $z1 ;; ipip|IPIP) setup_one_other IPIP $gateway 4 ;; gre|GRE) setup_one_other GRE $gateway 47 ;; 6to4|6TO4) setup_one_other 6to4 $gateway 41 ;; pptpclient|PPTPCLIENT) setup_pptp_client $gateway ;; pptpserver|PPTPSERVER) setup_pptp_server ;; openvpn|OPENVPN|openvpn:*|OPENVPN:*) setup_one_openvpn $gateway $kind ;; *) error_message "Tunnels of type $kind are not supported:" \ "Tunnel \"$tunnel\" Ignored" ;; esac else error_message "Invalid gateway zone ($z)" \ " -- Tunnel \"$tunnel\" Ignored" fi done < $TMP_DIR/tunnels } # # Setup Proxy ARP # setup_proxy_arp() { print_error() { error_message "Invalid value for HAVEROUTE - ($haveroute)" error_message "Entry \"$address $interface $external $haveroute\" ignored" } setup_one_proxy_arp() { case $haveroute in [Nn][Oo]) haveroute= ;; [Yy][Ee][Ss]) ;; *) if [ -n "$haveroute" ]; then print_error return fi ;; esac [ -z "$haveroute" ] && run_ip route add $address dev $interface run_arp -Ds $address $external pub echo 1 > /proc/sys/net/ipv4/conf/$interface/proxy_arp echo 0 > /proc/sys/net/ipv4/conf/$external/proxy_arp echo $address $interface $external $haveroute >> ${STATEDIR}/proxyarp echo " Host $address connected to $interface added to ARP on $external" } > ${STATEDIR}/proxyarp while read address interface external haveroute; do expandv address interface external haveroute setup_one_proxy_arp done < $TMP_DIR/proxyarp interfaces=`find_interfaces_by_option proxyarp` for interface in $interfaces; do if echo 1 > /proc/sys/net/ipv4/conf/$interface/proxy_arp 2> /dev/null; then echo " Enabled proxy ARP on $interface" else error_message "Warning: Unable to enable proxy ARP on $interface" fi done } # # Set up MAC Verification # setup_mac_lists() { local interface local mac local addresses local address local chain local logpart local macpart local blob local hosts # # Generate the list of interfaces having MAC verification # maclist_interfaces= for hosts in $maclist_hosts; do interface=${hosts%:*} if ! list_search $interface $maclist_interfaces; then\ if [ -z "$maclist_interfaces" ]; then maclist_interfaces=$interface else maclist_interfaces="$maclist_interfaces $interface" fi fi done echo "Setting up MAC Verification on $maclist_interfaces..." # # Be sure that they are all ethernet interfaces # for interface in $maclist_interfaces; do case $interface in eth*|wlan*) ;; *) fatal_error "MAC verification is only supported on ethernet and 802.11b devices: $interface" ;; esac createchain `mac_chain $interface` no done # # Process the maclist file producing the verification rules # while read interface mac addresses; do expandv interface mac addresses chain=`mac_chain $interface` if ! havechain $chain ; then fatal_error "No hosts on $interface have the maclist option specified" fi macpart=`mac_match $mac` if [ -z "$addresses" ]; then run_iptables -A $chain $macpart -j RETURN else for address in `separate_list $addresses` ; do run_iptables2 -A $chain $macpart -s $address -j RETURN done fi done < $TMP_DIR/maclist # # Must take care of our own broadcasts and multicasts then terminate the verification # chains # for interface in $maclist_interfaces; do chain=`mac_chain $interface` blob=`ip addr show $interface 2> /dev/null | grep inet | sed 's/inet //; s/brd //; s/scope.*//;'` [ -z "$blob" ] && \ fatal_error "Interface $interface must be up before Shorewall can start" set -- $blob while [ $# -gt 0 ]; do address=${1%/*} case $1 in */32) ;; *) run_iptables -A $chain -s $address -d $2 -j RETURN shift ;; esac run_iptables -A $chain -s $address -d 255.255.255.255 -j RETURN run_iptables -A $chain -s $address -d 224.0.0.0/4 -j RETURN shift done if [ -n "$MACLIST_LOG_LEVEL" ]; then log_rule $MACLIST_LOG_LEVEL $chain $MACLIST_DISPOSITION fi run_iptables -A $chain -j $maclist_target done # # Generate jumps from the input and forward chains # for hosts in $maclist_hosts; do interface=${hosts%:*} hosts=${hosts#*:} for chain in `first_chains $interface` ; do run_iptables -A $chain -s $hosts -m state --state NEW \ -j `mac_chain $interface` done done } # # Set up SYN flood protection # setup_syn_flood_chain () # $1 = policy chain # $2 = synparams { local chain=$1 local limit=${2%:*} local limit_burst=${2#*:} run_iptables -N @$chain run_iptables -A @$chain \ -m limit --limit $limit --limit-burst $limit_burst \ -j RETURN run_iptables -A @$chain -j DROP } # # Enable SYN flood protection on a chain # # Insert a jump rule to the protection chain from the first chain. Inserted # as the second rule and restrict the jump to SYN packets # enable_syn_flood_protection() # $1 = chain, $2 = protection chain { run_iptables -I $1 2 -p tcp --syn -j @$2 echo " Enabled SYN flood protection" } # # Delete existing Proxy ARP # delete_proxy_arp() { if [ -f ${STATEDIR}/proxyarp ]; then while read address interface external haveroute; do qt arp -i $external -d $address pub [ -z "$haveroute" ] && qt ip route del $address dev $interface done < ${STATEDIR}/proxyarp rm -f ${STATEDIR}/proxyarp fi [ -d ${STATEDIR} ] && touch ${STATEDIR}/proxyarp for f in `ls /proc/sys/net/ipv4/conf/*/proxy_arp`; do echo 0 > $f done } # # Setup Static Network Address Translation (NAT) # setup_nat() { local allints # # At this point, we're just interested in the network translation # > ${STATEDIR}/nat echo "Setting up NAT..." while read external interface internal allints localnat; do expandv external interface internal allints localnat iface=${interface%:*} if [ -n "$ADD_IP_ALIASES" ]; then qt ip addr del $external dev $iface fi if [ -z "$allints" -o "$allints" = "Yes" -o "$allints" = "yes" ] then addnatrule nat_in -d $external -j DNAT --to-destination $internal addnatrule nat_out -s $internal -j SNAT --to-source $external if [ "$localnat" = "Yes" -o "$localnat" = "yes" ]; then run_iptables2 -t nat -A OUTPUT -d $external \ -j DNAT --to-destination $internal fi else addnatrule `input_chain $iface` \ -d $external -j DNAT --to-destination $internal addnatrule `output_chain $iface` \ -s $internal -j SNAT --to-source $external fi if [ -n "$ADD_IP_ALIASES" ]; then list_search $external $aliases_to_add || \ aliases_to_add="$aliases_to_add $external $interface" fi echo " Host $internal NAT $external on $interface" done < $TMP_DIR/nat } # # Delete existing Static NAT # delete_nat() { run_iptables -t nat -F run_iptables -t nat -X if [ -f ${STATEDIR}/nat ]; then while read external interface; do qt ip addr del $external dev $interface done < ${STATEDIR}/nat rm -f {$STATEDIR}/nat fi [ -d ${STATEDIR} ] && touch ${STATEDIR}/nat } # # Setup ECN disabling rules # setup_ecn() # $1 = file name { local interfaces="" local hosts local h strip_file ecn $1 echo "Processing $1..." while read interface host; do expandv interface host list_search $interface $all_interfaces || \ startup_error "Unknown interface $interface" list_search $interface $interfaces || \ interfaces="$interfaces $interface" [ "x$host" = "x-" ] && host= for h in `separate_list ${host:-0.0.0.0/0}`; do hosts="$hosts $interface:$h" done done < $TMP_DIR/ecn if [ -n "$interfaces" ]; then echo "Setting up ECN control on${interfaces}..." for interface in $interfaces; do chain=`ecn_chain $interface` if mangle_chain_exists $chain; then flushmangle $chain else run_iptables -t mangle -N $chain run_iptables -t mangle -A POSTROUTING -p tcp -o $interface -j $chain run_iptables -t mangle -A OUTPUT -p tcp -o $interface -j $chain fi done for host in $hosts; do interface=${host%:*} h=${host#*:} run_iptables -t mangle -A `ecn_chain $interface` -p tcp -d $h -j ECN --ecn-tcp-remove echo " ECN Disabled to $h through $interface" done fi } # # Process a TC Rule - $marking_chain is assumed to contain the name of the # default marking chain # process_tc_rule() { add_a_tc_rule() { r= chain=$marking_chain if [ "x$source" != "x-" ]; then case $source in *.*.*) r="-s $source " ;; ~*) r=`mac_match $source` ;; $FW) chain=tcout ;; *) if ! list_search $source $all_interfaces; then fatal_error "Unknown interface $source in rule \"$rule\"" fi r="-i $source " ;; esac fi if [ "$mark" != "${mark%:*}" ]; then [ "$chain" = tcout ] && \ fatal_error "Chain designator not allowed when source is \$FW; rule \"$rule\"" case "${mark#*:}" in p|P) chain=tcpre ;; f|F) chain=tcfor ;; *) fatal_error "Invalid chain designator: (${mark#*:}) in rule \"$rule\"" ;; esac mark="${mark%:*}" fi [ "x$dest" = "x-" ] || r="${r}-d $dest " [ "$proto" = "all" ] || r="${r}-p $proto " [ "x$port" = "x-" ] || r="${r}--dport $port " [ "x$sport" = "x-" ] || r="${r}--sport $sport " run_iptables2 -t mangle -A $chain $r -j MARK --set-mark $mark } for source in `separate_list ${sources:=-}`; do for dest in `separate_list ${dests:=-}`; do for port in `separate_list ${ports:=-}`; do for sport in `separate_list ${sports:=-}`; do add_a_tc_rule done done done done echo " TC Rule \"$rule\" added" } # # Setup queuing and classes # setup_tc1() { # # Create the TC mangle chains # run_iptables -t mangle -N tcpre run_iptables -t mangle -N tcfor run_iptables -t mangle -N tcout # # Process the TC Rules File # strip_file tcrules while read mark sources dests proto ports sports; do expandv mark sources dests proto ports sports rule=`echo "$mark $sources $dests $proto $ports $sports"` process_tc_rule done < $TMP_DIR/tcrules # # Link to the TC mangle chains from the main chains # run_iptables -t mangle -A FORWARD -j tcfor run_iptables -t mangle -A PREROUTING -j tcpre run_iptables -t mangle -A OUTPUT -j tcout run_user_exit tcstart } setup_tc() { echo "Setting up Traffic Control Rules..." setup_tc1 } # # Clear Traffic Shaping # delete_tc() { clear_one_tc() { tc qdisc del dev $1 root 2> /dev/null tc qdisc del dev $1 ingress 2> /dev/null } run_user_exit tcclear run_ip link list | \ while read inx interface details; do case $inx in [0-9]*) clear_one_tc ${interface%:} ;; *) ;; esac done } # # Check the configuration # check_config() { disclaimer() { echo echo "Notice: The 'check' command is unsupported and problem" echo " reports complaining about errors that it didn't catch" echo " will not be accepted" echo } disclaimer report_capabilities echo "Verifying Configuration..." verify_os_version load_kernel_modules echo "Determining Zones..." determine_zones [ -z "$zones" ] && startup_error "ERROR: No Zones Defined" display_list "Zones:" $zones echo "Validating interfaces file..." validate_interfaces_file echo "Validating hosts file..." validate_hosts_file echo "Determining Hosts in Zones..." determine_interfaces determine_hosts echo "Validating policy file..." validate_policy echo "Validating rules file..." rules=`find_file rules` strip_file rules $rules process_rules rm -rf $TMP_DIR echo "Configuration Validated" disclaimer } # # Refresh queuing and classes # refresh_tc() { echo "Refreshing Traffic Control Rules..." [ -n "$CLEAR_TC" ] && delete_tc [ -n "$MARK_IN_FORWARD_CHAIN" ] && chain=tcfor || chain=tcpre if mangle_chain_exists $chain; then # # Flush the TC mangle chains # run_iptables -t mangle -F $chain run_iptables -t mangle -F tcout # # Process the TC Rules File # strip_file tcrules while read mark sources dests proto ports sports; do expandv mark sources dests proto ports sports rule=`echo "$mark $sources $dests $proto $ports $sports"` process_tc_rule done < $TMP_DIR/tcrules run_user_exit tcstart else setup_tc1 fi } # # Add a NAT rule - Helper function for the rules file processor # # The caller has established the following variables: # command = The current command -- if 'check', we just go through # the motions. # cli = Source IP, interface or MAC Specification # serv = Destination IP Specification # servport = Port the server is listening on # dest_interface = Destination Interface Specification # proto = Protocol Specification # addr = Original Destination Address # dports = Destination Port Specification. 'dports' may be changed # by this function # cport = Source Port Specification # multiport = String to invoke multiport match if appropriate # add_nat_rule() { local chain local excludedests= # Be sure we can NAT if [ -z "$NAT_ENABLED" ]; then fatal_error "Rule \"$rule\" requires NAT which is disabled" fi # Parse SNAT address if any if [ "$addr" != "${addr%:*}" ]; then snat="${addr#*:}" addr="${addr%:*}" else snat="" fi # Set original destination address case $addr in all) addr= ;; detect) addr= if [ -n "$DETECT_DNAT_IPADDRS" -a "$source" != "$FW" ]; then eval interfaces=\$${source}_interfaces for interface in $interfaces; do addr=${addr:+$addr,}`find_interface_address $interface` done fi ;; !*) if [ `list_count $addr` -gt 1 ]; then excludedests="`separate_list ${addr#\!}`" addr= fi ;; esac addr=${addr:-0.0.0.0/0} # Select target if [ -n "$serv" ]; then servport="${servport:+:$servport}" serv1= for srv in `separate_list $serv`; do serv1="$serv1 --to-destination ${srv}${servport}" done target1="DNAT $serv1" else target1="REDIRECT --to-port $servport" fi if [ $source = $FW ]; then [ -n "$excludezones" ] && fatal_error "Invalid Source in rule \"$rule\"" fi # Generate nat table rules if [ $command != check ]; then if [ "$source" = "$FW" ]; then if [ -n "$excludedests" ]; then chain=nonat${nonat_seq} nonat_seq=$(($nonat_seq + 1)) createnatchain $chain run_iptables -t nat -A OUTPUT $cli $proto $multiport $sports $dports -j $chain for adr in $excludedests; do addnatrule $chain -d $adr -j RETURN done if [ -n "$loglevel" ]; then log_rule $loglevel $chain $logtarget -t nat fi addnatrule $chain -j $target1 else for adr in `separate_list $addr`; do run_iptables2 -t nat -A OUTPUT $proto $sports -d $adr \ $multiport $dports -j $target1 done fi else chain=`dnat_chain $source` if [ -n "${excludezones}${excludedests}" ]; then chain=nonat${nonat_seq} nonat_seq=$(($nonat_seq + 1)) createnatchain $chain addnatrule `dnat_chain $source` $cli $proto $multiport $sports $dports -j $chain for z in $excludezones; do eval hosts=\$${z}_hosts for host in $hosts; do for adr in `separate_list $addr`; do addnatrule $chain -s ${host#*:} -d $adr -j RETURN done done done for adr in $excludedests; do addnatrule $chain -d $adr -j RETURN done for adr in `separate_list $addr`; do if [ -n "$loglevel" ]; then log_rule $loglevel $chain $logtarget -t nat -d `fix_bang $adr` fi addnatrule $chain -d $adr -j $target1 done else for adr in `separate_list $addr`; do if [ -n "$loglevel" ]; then ensurenatchain $chain log_rule $loglevel $chain $logtarget -t nat \ `fix_bang $proto $cli $sports -d $adr $multiport $dports` fi addnatrule $chain $proto $cli $sports \ -d $adr $multiport $dports -j $target1 done fi fi fi # Replace destination port by the new destination port if [ -n "$servport" ]; then if [ -z "$multiport" ]; then dports="--dport ${servport#*:}" else dports="--dports ${servport#*:}" fi fi # Handle SNAT if [ -n "$snat" ]; then if [ -n "$cli" ]; then [ $command = check ] || addnatrule `snat_chain $dest` $proto $cli $multiport \ $sports -d $serv $dports -j SNAT --to-source $snat else for source_host in $source_hosts; do [ "x${source_host#*:}" = "x0.0.0.0/0" ] && \ error_message "Warning: SNAT will occur on all connections to this server and port - rule \"$rule\"" [ $command = check ] || addnatrule `snat_chain $dest` \ -s ${source_host#*:} $proto $sports $multiport \ -d $serv $dports -j SNAT --to-source $snat done fi fi } # # Add one Filter Rule -- Helper function for the rules file processor # # The caller has established the following variables: # check = current command. If 'check', we're executing a 'check' # which only goes through the motions. # client = SOURCE IP or MAC # server = DESTINATION IP or interface # protocol = Protocol # address = Original Destination Address # port = Destination Port # cport = Source Port # multioption = String to invoke multiport match if appropriate # servport = Port the server listens on # chain = The canonical chain for this rule # add_a_rule() { local natrule= # Set source variables. The 'cli' variable will hold the client match predicate(s). cli= case "$client" in -) ;; *:*) cli="-i ${client%:*} -s ${client#*:}" ;; *.*.*) cli="-s $client" ;; ~*) cli=`mac_match $client` ;; *) [ -n "$client" ] && cli="-i $client" ;; esac # Set destination variables - 'serv' and 'dest_interface' hold the server match predicate(s). dest_interface= serv= case "$server" in -) ;; *.*.*) serv=$server ;; ~*) fatal_error "Rule \"$rule\" - Destination may not be specified by MAC Address" ;; *) [ -n "$server" ] && dest_interface="-o $server" ;; esac # Setup protocol and port variables sports= dports= state="-m state --state NEW" proto=$protocol addr=$address servport=$serverport multiport= [ x$port = x- ] && port= [ x$cport = x- ] && cport= case $proto in tcp|udp|TCP|UDP|6|17) if [ -n "$port" ]; then dports="--dport" if [ -n "$multioption" -a "$port" != "${port%,*}" ]; then multiport="$multioption" dports="--dports" fi dports="$dports $port" fi if [ -n "$cport" ]; then sports="--sport" if [ -n "$multioption" -a "$cport" != "${cport%,*}" ]; then multiport="$multioption" sports="--sports" fi sports="$sports $cport" fi ;; icmp|ICMP|1) [ -n "$port" ] && dports="--icmp-type $port" state= ;; all|ALL) [ -n "$port" ] && \ fatal_error "Port number not allowed with \"all\"; rule: \"$rule\"" proto= ;; *) state= [ -n "$port" ] && \ fatal_error "Port number not allowed with protocol \"$proto\"; rule: \"$rule\"" ;; esac proto="${proto:+-p $proto}" # Some misc. setup case "$logtarget" in REJECT) target=reject [ -n "$servport" ] && \ fatal_error "Server port may not be specified in a REJECT rule;"\ "rule: \"$rule\"" ;; REDIRECT) [ -n "$serv" ] && startup_error "REDIRECT rules cannot"\ " specify a server IP; rule: \"$rule\"" servport=${servport:=$port} natrule=Yes ;; DNAT) [ -n "$serv" ] || fatal_error "DNAT rules require a" \ " server address; rule: \"$rule\"" natrule=Yes ;; LOG) [ -z "$loglevel" ] && fatal_error "LOG requires log level" ;; esac # Complain if the rule is really a policy if [ -z "$proto" -a -z "$cli" -a -z "$serv" -a -z "$servport" -a "$logtarget" != LOG ]; then error_message "Warning -- Rule \"$rule\" is a POLICY" error_message " -- and should be moved to the policy file" fi if [ -n "${serv}${servport}" ]; then if [ $command != check ]; then # A specific server or server port given if [ -n "$natrule" ]; then add_nat_rule elif [ -n "$addr" -a "$addr" != "$serv" ] || [ -n "$servport" -a "$servport" != "$port" ]; then fatal_error "Only DNAT and REDIRECT rules may specify destination mapping; rule \"$rule\"" fi if [ -z "$dnat_only" -a $chain != ${FW}2${FW} ]; then if [ -n "$serv" ]; then for serv1 in `separate_list $serv`; do for srv in `ip_range $serv1`; do if [ -n "$addr" -a -n "$CONNTRACK_MATCH" ]; then for adr in $addr; do if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule $loglevel $chain $logtarget -m conntrack --ctorigdst $adr \ `fix_bang $proto $sports $multiport $state $cli -d $srv $dports` fi run_iptables2 -A $chain $proto $multiport $state $cli $sports \ -d $srv $dports -m conntrack --ctorigdst $adr -j $target done else if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule $loglevel $chain $logtarget \ `fix_bang $proto $sports $multiport $state $cli -d $srv $dports` fi run_iptables2 -A $chain $proto $multiport $state $cli $sports \ -d $srv $dports -j $target fi done done else if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule $loglevel $chain $logtarget \ `fix_bang $proto $sports $multiport $state $cli $dports` fi run_iptables2 -A $chain $proto $multiport $state $cli $sports \ $dports -j $target fi fi fi else # Destination is a simple zone [ -n "$addr" ] && fatal_error \ "An ORIGINAL DESTINATION ($addr) is only allowed in" \ " a DNAT or REDIRECT: \"$rule\"" if [ $command != check ]; then if [ -n "$loglevel" ]; then log_rule $loglevel $chain $logtarget \ `fix_bang $proto $multiport $dest_interface $state $cli $sports $dports` fi if [ $logtarget != LOG ]; then run_iptables2 -A $chain $proto $multiport $dest_interface $state \ $cli $sports $dports -j $target fi fi fi } # # Process a record from the rules file for the 'start', 'restart' or 'check' commands # process_rule() # $1 = target # $2 = clients # $3 = servers # $4 = protocol # $5 = ports # $6 = cports # $7 = address { local target="$1" local clients="$2" local servers="$3" local protocol="$4" local ports="$5" local cports="$6" local address="$7" local rule="`echo $target $clients $servers $protocol $ports $cports $address`" # Function Body -- isolate log level if [ "$target" = "${target%:*}" ]; then loglevel= else loglevel="${target#*:}" target="${target%:*}" expandv loglevel fi logtarget="$target" dnat_only= # Tranform the rule: # # - set 'target' to the filter table target. # - make $FW the destination for REDIRECT # - remove '-' suffix from logtargets while setting 'dnat_only' # - clear 'address' if it has been set to '-' [ "x$address" = "x-" ] && address= case $target in DNAT) target=ACCEPT address=${address:=detect} ;; DNAT-) target=ACCEPT address=${address:=detect} dnat_only=Yes logtarget=DNAT ;; REDIRECT) target=ACCEPT address=${address:=all} if [ "x-" = "x$servers" ]; then servers=$FW else servers="$FW::$servers" fi ;; REDIRECT-) target=ACCEPT logtarget=REDIRECT dnat_only=Yes address=${address:=all} if [ "x-" = "x$servers" ]; then servers=$FW else servers="$FW::$servers" fi ;; esac # Parse and validate source if [ "$clients" = "${clients%:*}" ]; then clientzone="$clients" clients= else clientzone="${clients%%:*}" clients="${clients#*:}" [ -z "$clientzone" -o -z "$clients" ] && \ fatal_error "Empty source zone or qualifier: rule \"$rule\"" fi if [ "$clientzone" = "${clientzone%\!*}" ]; then excludezones= else excludezones="${clientzone#*\!}" clientzone="${clientzone%\!*}" [ "$logtarget" = DNAT ] || [ "$logtarget" = REDIRECT ] ||\ fatal_error "Exclude list only allowed with DNAT or REDIRECT" fi validate_zone $clientzone || fatal_error "Undefined Client Zone in rule \"$rule\"" # Parse and validate destination source=$clientzone [ $source = $FW ] && source_hosts= || eval source_hosts=\"\$${source}_hosts\" if [ "$servers" = "${servers%:*}" ] ; then serverzone="$servers" servers= serverport= else serverzone="${servers%%:*}" servers="${servers#*:}" if [ "$servers" != "${servers%:*}" ] ; then serverport="${servers#*:}" servers="${servers%:*}" [ -z "$serverzone" -o -z "$serverport" ] && \ fatal_error "Empty destination zone or server port: rule \"$rule\"" else serverport= [ -z "$serverzone" -o -z "$servers" ] && \ fatal_error "Empty destination zone or qualifier: rule \"$rule\"" fi fi if ! validate_zone $serverzone; then fatal_error "Undefined Server Zone in rule \"$rule\"" fi dest=$serverzone # Ensure that this rule doesn't apply to a NONE policy pair of zones chain=${source}2${dest} eval policy=\$${chain}_policy [ $policy = NONE ] && \ fatal_error "Rules may not override a NONE policy: rule \"$rule\"" # Be sure that this isn't a fw->fw rule. if [ "x$chain" = x${FW}2${FW} ]; then case $logtarget in REDIRECT|DNAT) # # Redirect rules that have the firewall as the source are fw->fw rules # ;; *) error_message "WARNING: fw -> fw rules are not supported; rule \"$rule\" ignored" return ;; esac else # Create the canonical chain if it doesn't already exist [ $command = check ] || ensurechain $chain fi # Generate Netfilter rule(s) case $logtarget in DNAT*) if [ -n "$MULTIPORT" -a \ "$ports" = "${ports%:*}" -a \ "$cports" = "${cports%:*}" -a \ `list_count $ports` -le 15 -a \ `list_count $cports` -le 15 ] then # # MULTIPORT is enabled, there are no port ranges in the rule and less than # 16 ports are listed - use multiport match. # multioption="-m multiport" for client in `separate_list ${clients:=-}`; do # # add_a_rule() modifies these so we must set their values each time # server=${servers:=-} port=${ports:=-} cport=${cports:=-} add_a_rule done else # # MULTIPORT is disabled or the rule isn't compatible with multiport match # multioption= for client in `separate_list ${clients:=-}`; do for port in `separate_list ${ports:=-}`; do for cport in `separate_list ${cports:=-}`; do server=${servers:=-} add_a_rule done done done fi ;; *) if [ -n "$MULTIPORT" -a \ "$ports" = "${ports%:*}" -a \ "$cports" = "${cports%:*}" -a \ `list_count $ports` -le 15 -a \ `list_count $cports` -le 15 ] then # # MULTIPORT is enabled, there are no port ranges in the rule and less than # 16 ports are listed - use multiport match. # multioption="-m multiport" for client in `separate_list ${clients:=-}`; do for server in `separate_list ${servers:=-}`; do # # add_a_rule() modifies these so we must set their values each time # port=${ports:=-} cport=${cports:=-} add_a_rule done done else # # MULTIPORT is disabled or the rule isn't compatible with multiport match # multioption= for client in `separate_list ${clients:=-}`; do for server in `separate_list ${servers:=-}`; do for port in `separate_list ${ports:=-}`; do for cport in `separate_list ${cports:=-}`; do add_a_rule done done done done fi ;; esac # # Report Result # if [ $command = check ]; then echo " Rule \"$rule\" checked." else echo " Rule \"$rule\" added." fi } # # Process the rules file for the 'start', 'restart' or 'check' command. # process_rules() # $1 = name of rules file { # # Process a rule where the source or destination is "all" # process_wildcard_rule() { for yclients in $xclients; do for yservers in $xservers; do if [ "${yclients}" != "${yservers}" ] ; then process_rule $xtarget $yclients $yservers $xprotocol $xports $xcports $xaddress fi done done } while read xtarget xclients xservers xprotocol xports xcports xaddress; do case "${xtarget%:*}" in ACCEPT|DROP|REJECT|DNAT|DNAT|DNAT-|REDIRECT|REDIRECT-|LOG|CONTINUE) expandv xclients xservers xprotocol xports xcports xaddress if [ "x$xclients" = xall ]; then xclients="$zones $FW" if [ "x$xservers" = xall ]; then xservers="$zones $FW" fi process_wildcard_rule continue fi if [ "x$xservers" = xall ]; then xservers="$zones $FW" process_wildcard_rule continue fi process_rule $xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress ;; *) rule="`echo $xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress`" fatal_error "Invalid Target in rule \"$rule\"" ;; esac done < $TMP_DIR/rules } # # Process a record from the tos file # # The caller has loaded the column contents from the record into the following # variables: # # src dst protocol sport dport tos # # and has loaded a space-separated list of their values in "rule". # process_tos_rule() { # # Parse the contents of the 'src' variable # if [ "$src" = "${src%:*}" ]; then srczone="$src" src= else srczone="${src%:*}" src="${src#*:}" fi source= # # Validate the source zone # if validate_zone $srczone; then source=$srczone elif [ "$srczone" = "all" ]; then source="all" else error_message "Warning: Undefined Source Zone - rule \"$rule\" ignored" return fi [ -n "$src" ] && case "$src" in *.*.*) # # IP Address or subnet # src="-s $src" ;; ~*) src=`mac_match $src` ;; *) # # Assume that this is a device name # src="-i $src" ;; esac # # Parse the contents of the 'dst' variable # if [ "$dst" = "${dst%:*}" ]; then dstzone="$dst" dst= else dstzone="${dst%:*}" dst="${dst#*:}" fi dest= # # Validate the destination zone # if validate_zone $dstzone; then dest=$dstzone elif [ "$dstzone" = "all" ]; then dest="all" else error_message \ "Warning: Undefined Destination Zone - rule \"$rule\" ignored" return fi [ -n "$dst" ] && case "$dst" in *.*.*) # # IP Address or subnet # ;; *) # # Assume that this is a device name # error_message \ "Warning: Invalid Destination - rule \"$rule\" ignored" return ;; esac # # Setup PROTOCOL and PORT variables # sports="" dports="" case $protocol in tcp|udp|TCP|UDP|6|17) [ -n "$sport" ] && [ "x${sport}" != "x-" ] && \ sports="--sport $sport" [ -n "$dport" ] && [ "x${dport}" != "x-" ] && \ dports="--dport $dport" ;; icmp|ICMP|0) [ -n "$dport" ] && [ "x${dport}" != "x-" ] && \ dports="--icmp-type $dport" ;; all|ALL) protocol= ;; *) ;; esac protocol="${protocol:+-p $protocol}" tos="-j TOS --set-tos $tos" case "$dstzone" in all|ALL) dst=0.0.0.0/0 ;; *) [ -z "$dst" ] && eval dst=\$${dstzone}_hosts ;; esac for dest in $dst; do dest="-d $dest" case $srczone in $FW) run_iptables2 -t mangle -A outtos \ $protocol $dest $dports $sports $tos ;; all|ALL) run_iptables2 -t mangle -A outtos \ $protocol $dest $dports $sports $tos run_iptables2 -t mangle -A pretos \ $protocol $dest $dports $sports $tos ;; *) if [ -n "$src" ]; then run_iptables2 -t mangle -A pretos $src \ $protocol $dest $dports $sports $tos else eval interfaces=\$${srczone}_interfaces for interface in $interfaces; do run_iptables2 -t mangle -A pretos -i $interface \ $protocol $dest $dports $sports $tos done fi ;; esac done echo " Rule \"$rule\" added." } # # Process the tos file # process_tos() # $1 = name of tos file { echo "Processing $1..." run_iptables -t mangle -N pretos run_iptables -t mangle -N outtos strip_file tos $1 while read src dst protocol sport dport tos; do expandv src dst protocol sport dport tos rule="`echo $src $dst $protocol $sport $dport $tos`" process_tos_rule done < $TMP_DIR/tos run_iptables -t mangle -A PREROUTING -j pretos run_iptables -t mangle -A OUTPUT -j outtos } # # Load a Kernel Module # loadmodule() # $1 = module name, $2 - * arguments { local modulename=$1 local modulefile if [ -z "`lsmod | grep $modulename`" ]; then shift modulefile=$MODULESDIR/${modulename}.o if [ -f $modulefile ]; then insmod $modulefile $* return fi # # If the modules directory contains compressed modules then we'll # assume that insmod can load them # modulefile=${modulefile}.gz if [ -f $modulefile ]; then insmod $modulefile $* fi fi } # # Display elements of a list with leading white space # display_list() # $1 = List Title, rest of $* = list to display { [ $# -gt 1 ] && echo " $*" } # # Add rules to the "common" chain to silently drop packets addressed to any of # the passed addresses # drop_broadcasts() # $* = broadcast addresses { while [ $# -gt 0 ]; do run_iptables -A common -d $1 -j DROP shift done } # # Add policy rule ( and possibly logging rule) to the passed chain # policy_rules() # $1 = chain to add rules to # $2 = policy # $3 = loglevel { local target="$2" case "$target" in ACCEPT) ;; DROP) run_iptables -A $1 -j common ;; REJECT) run_iptables -A $1 -j common target=reject ;; CONTINUE) target= ;; *) fatal_error "Invalid policy ($policy) for $1" ;; esac if [ $# -eq 3 -a "x${3}" != "x-" ]; then log_rule $3 $1 $2 fi [ -n "$target" ] && run_iptables -A $1 -j $target } # # Generate default policy & log level rules for the passed client & server # zones # # This function is only called when the canonical chain for this client/server # pair is known to exist. If the default policy for this pair specifies the # same chain then we add the policy (and logging) rule to the canonical chain; # otherwise add a rule to the canonical chain to jump to the appropriate # policy chain. # default_policy() # $1 = client $2 = server { local chain="${1}2${2}" local policy= local loglevel= local chain1 jump_to_policy_chain() { # # Add a jump to from the canonical chain to the policy chain. On return, # $chain is set to the name of the policy chain # run_iptables -A $chain -j $chain1 chain=$chain1 } apply_default() { # # Generate policy file column values from the policy chain # eval policy=\$${chain1}_policy eval loglevel=\$${chain1}_loglevel eval synparams=\$${chain1}_synparams # # Add the appropriate rules to the canonical chain ($chain) to enforce # the specified policy if [ "$chain" = "$chain1" ]; then # # The policy chain is the canonical chain; add policy rule to it # The syn flood jump has already been added if required. # policy_rules $chain $policy $loglevel else # # The policy chain is different from the canonical chain -- approach # depends on the policy # case $policy in ACCEPT) if [ -n "$synparams" ]; then # # To avoid double-counting SYN packets, enforce the policy # in this chain. # enable_syn_flood_protection $chain $chain1 policy_rules $chain $policy $loglevel else # # No problem with double-counting so just jump to the # policy chain. # jump_to_policy_chain fi ;; CONTINUE) # # Silly to jump to the policy chain -- add any logging # rules and enable SYN flood protection if requested # [ -n "$synparams" ] && \ enable_syn_flood_protection $chain $chain1 policy_rules $chain $policy $loglevel ;; *) # # DROP or REJECT policy -- enforce in the policy chain and # enable SYN flood protection if requested. # [ -n "$synparams" ] && \ enable_syn_flood_protection $chain $chain1 jump_to_policy_chain ;; esac fi echo " Policy $policy for $1 to $2 using chain $chain" } eval chain1=\$${1}2${2}_policychain if [ -n "$chain1" ]; then apply_default $1 $2 else fatal_error "No default policy for zone $1 to zone $2" fi } # # Complete a standard chain # # - run any supplied user exit # - search the policy file for an applicable policy and add rules as # appropriate # - If no applicable policy is found, add rules for an assummed # policy of DROP INFO # complete_standard_chain() # $1 = chain, $2 = source zone, $3 = destination zone { local policy= local loglevel= local policychain= run_user_exit $1 eval policychain=\$${2}2${3}_policychain if [ -n "$policychain" ]; then eval policy=\$${policychain}_policy eval loglevel=\$${policychain}_loglevel policy_rules $1 $policy $loglevel else policy_rules $1 DROP INFO fi } # # Find the appropriate chain to pass packets from a source zone to a # destination zone # # If the canonical chain for this zone pair exists, echo it's name; otherwise # locate and echo the name of the appropriate policy chain # rules_chain() # $1 = source zone, $2 = destination zone { local chain=${1}2${2} havechain $chain && { echo $chain; return; } [ "$1" = "$2" ] && { echo ACCEPT; return; } eval chain=\$${chain}_policychain [ -n "$chain" ] && { echo $chain; return; } fatal_error "No appropriate chain for zone $1 to zone $2" } # # Note: The following set of IP address manipulation functions have anomalous # behavior when the shell only supports 32-bit signed arithmatic and # the IP address is 128.0.0.0 or 128.0.0.1. # # # echo the list of subnets routed out of a given interface # get_routed_subnets() # $1 = interface name { local address local rest ip route show dev $1 2> /dev/null | while read address rest; do if [ "x$address" = xdefault ]; then error_message "Warning: default route ignored on interface $1" else [ "$address" = "${address%/*}" ] && address="${address}/32" echo $address fi done } # # Convert an IP address in dot quad format to an integer # decodeaddr() { local x local temp=0 local ifs=$IFS IFS=. for x in $1; do temp=$(( $(( $temp $LEFTSHIFT 8 )) | $x )) done echo $temp IFS=$ifs } # # convert an integer to dot quad format # encodeaddr() { addr=$1 local x local y=$(($addr & 255)) for x in 1 2 3 ; do addr=$(($addr >> 8)) y=$(($addr & 255)).$y done echo $y } # # Enumerate the members of an IP range -- When using a shell supporting only # 32-bit signed arithmetic, the range cannot span 128.0.0.0. # ip_range() { local first local last case $1 in *-*) ;; *) echo $1 return ;; esac first=`decodeaddr ${1%-*}` last=`decodeaddr ${1#*-}` if [ $first -gt $last -o $(($last - $first)) -gt 256 ]; then fatal_error "Invalid IP address range: $1" fi while [ $first -le $last ]; do echo `encodeaddr $first` first=$(($first + 1)) done } # # Netmask from CIDR # ip_netmask() { echo $(( -1 $LEFTSHIFT $((32 - ${1#*/})) )) } # # Network address from CIDR # networkaddress() { local decodedaddr=`decodeaddr ${1%/*}` local netmask=`ip_netmask $1` echo `encodeaddr $(($decodedaddr & $netmask))` } # # Calculate broadcast address from CIDR # broadcastaddress() { local decodedaddr=`decodeaddr ${1%/*}` local netmask=`ip_netmask $1` echo `encodeaddr $(( $(($decodedaddr & $netmask)) | $(( $netmask ^ -1 )) ))` } # # Test for subnet membership # in_subnet() # $1 = IP address, $2 = CIDR network { local netmask=`ip_netmask $2` test $(( `decodeaddr $1` & $netmask)) -eq $(( `decodeaddr ${2%/*}` & $netmask )) } # # Set up Source NAT (including masquerading) # setup_masq() { setup_one() { local using case $fullinterface in *:*:*) # Both alias name and subnet destnet="${fullinterface##*:}" fullinterface="${fullinterface%:*}" ;; *:*) # Alias name OR subnet case ${fullinterface#*:} in *.*) # It's a subnet destnet="${fullinterface#*:}" fullinterface="${fullinterface%:*}" ;; *) #it's an alias name destnet="0.0.0.0/0" ;; esac ;; *) destnet="0.0.0.0/0" ;; esac interface=${fullinterface%:*} if ! list_search $interface $all_interfaces; then fatal_error "Unknown interface $interface" fi if [ "$subnet" = "${subnet%!*}" ]; then nomasq= else nomasq="${subnet#*!}" subnet="${subnet%!*}" fi chain=`masq_chain $interface` iface= source="$subnet" case $subnet in *.*.*) ;; -) # # Note: This only works if you have the LOCAL NAT patches in the # kernel and in the iptables utility # chain=OUTPUT subnet= source=$FW iface="-o $interface" ;; *) subnets=`get_routed_subnets $subnet` [ -z "$subnets" ] && startup_error "Unable to determine the routes through interface $subnet" subnet="$subnets" ;; esac if [ -n "$address" -a -n "$ADD_SNAT_ALIASES" ]; then for addr in `ip_range $address` ; do if ! list_search $addr $aliases_to_add; then aliases_to_add="$aliases_to_add $addr $fullinterface" case $fullinterface in *:*) fullinterface=${fullinterface%:*}:$((${fullinterface#*:} + 1 )) ;; esac fi done fi destination=$destnet if [ -n "$nomasq" ]; then newchain=masq${masq_seq} createnatchain $newchain if [ -n "$subnet" ]; then for s in $subnet; do addnatrule $chain -d $destnet $iface -s $s -j $newchain done else addnatrule $chain -d $destnet $iface -j $newchain fi masq_seq=$(($masq_seq + 1)) chain=$newchain subnet= iface= destnet= for addr in `separate_list $nomasq`; do addnatrule $chain -s $addr -j RETURN done source="$source except $nomasq" else destnet="-d $destnet" fi if [ -n "$subnet" ]; then for s in $subnet; do if [ -n "$address" ]; then addnatrule $chain -s $s $destnet $iface -j SNAT --to-source $address echo " To $destination from $s through ${interface} using $address" else addnatrule $chain -s $s $destnet $iface -j MASQUERADE echo " To $destination from $s through ${interface}" fi done elif [ -n "$address" ]; then addnatrule $chain $destnet $iface -j SNAT --to-source $address echo " To $destination from $source through ${interface} using $address" else addnatrule $chain $destnet $iface -j MASQUERADE echo " To $destination from $source through ${interface}" fi } strip_file masq $1 [ -n "$NAT_ENABLED" ] && echo "Masqueraded Subnets and Hosts:" while read fullinterface subnet address; do expandv fullinterface subnet address [ -n "$NAT_ENABLED" ] && setup_one || \ error_message "Warning: NAT disabled; masq rule ignored" done < $TMP_DIR/masq } # # Add a record to the blacklst chain # # $source = address match # $proto = protocol selector # $dport = destination port selector # add_blacklist_rule() { if [ -n "$BLACKLIST_LOGLEVEL" ]; then log_rule $BLACKLIST_LOGLEVEL blacklst $BLACKLIST_DISPOSITION `fix_bang $source $proto $dport` fi run_iptables2 -A blacklst $source $proto $dport -j $disposition } # # Process a record from the blacklist file # # $subnet = address/subnet # $protocol = Protocol Number/Name # $port = Port Number/Name # process_blacklist_rec() { local source local addr local proto local dport for addr in `separate_list $subnet`; do case $addr in ~*) addr=`echo $addr | sed 's/~//;s/-/:/g'` source="--match mac --mac-source $addr" ;; *) source="-s $addr" ;; esac if [ -n "$protocol" ]; then proto=" -p $protocol " case $protocol in tcp|TCP|6|udp|UDP|17) if [ -n "$ports" ]; then if [ -n "$MULTIPORT" -a \ "$ports" != "${ports%,*}" -a \ "$ports" = "${ports%:*}" -a \ `list_count $ports` -le 15 ] then dport="-m multiport --dports $ports" add_blacklist_rule else for dport in `separate_list $ports`; do dport="--dport $dport" add_blacklist_rule done fi else add_blacklist_rule fi ;; icmp|ICMP|0) if [ -n "$ports" ]; then for dport in `separate_list $ports`; do dport="--icmp-type $dport" add_blacklist_rule done else add_blacklist_rule fi ;; *) add_blacklist_rule ;; esac else add_blacklist_rule fi if [ -n "$ports" ]; then addr="$addr $protocol $ports" elif [ -n "$protocol" ]; then addr="$addr $protocol" fi echo " $addr added to Black List" done } # # Setup the Black List # setup_blacklist() { local interfaces=`find_interfaces_by_option blacklist` local f=`find_file blacklist` local disposition=$BLACKLIST_DISPOSITION if [ -n "$interfaces" -a -f $f ]; then echo "Setting up Blacklisting..." strip_file blacklist $f createchain blacklst no for interface in $interfaces; do for chain in `first_chains $interface`; do run_iptables -A $chain -j blacklst done echo " Blacklisting enabled on $interface" done [ "$disposition" = REJECT ] && disposition=reject while read subnet protocol ports; do expandv subnet protocol ports process_blacklist_rec done < $TMP_DIR/blacklist fi } # # Refresh the Black List # refresh_blacklist() { local f=`find_file blacklist` local disposition=$BLACKLIST_DISPOSITION if qt iptables -L blacklst -n ; then echo "Refreshing Black List..." strip_file blacklist $f [ "$disposition" = REJECT ] && disposition=reject run_iptables -F blacklst while read subnet protocol ports; do expandv subnet protocol ports process_blacklist_rec done < $TMP_DIR/blacklist fi } # # Verify that kernel has netfilter support # verify_os_version() { osversion=`uname -r` case $osversion in 2.4.*|2.5.*) ;; *) startup_error "Shorewall version $version does not work with kernel version $osversion" ;; esac [ $command = start -a -n "`lsmod 2> /dev/null | grep '^ipchains'`" ] && \ startup_error "Shorewall can't start with the ipchains kernel module loaded - see FAQ #8" } # # Add IP Aliases # add_ip_aliases() { local addresses external interface inet cidr rest val address_details() { # # Folks feel uneasy if they don't see all of the same # decoration on these IP addresses that they see when their # distro's net config tool adds them. In an attempt to reduce # the anxiety level, we have the following code which sets # the VLSM and BRD from an existing address in the same subnet # # Get all of the lines that contain inet addresses # ip addr show $interface 2> /dev/null | grep 'inet' | while read inet cidr rest ; do if in_subnet $external $cidr; then echo "/${cidr#*/} brd `broadcastaddress $cidr`" break fi done } do_one() { val=`address_details` run_ip addr add ${external}${val} dev $interface $label echo "$external $interface" >> ${STATEDIR}/nat [ -n "$label" ] && label="with $label" echo " IP Address $external added to interface $interface $label" } set -- $aliases_to_add while [ $# -gt 0 ]; do external=$1 interface=$2 label= if [ "$interface" != "${interface%:*}" ]; then label="${interface#*:}" interface="${interface%:*}" label="label $interface:$label" fi shift;shift list_search $external `find_interface_addresses $interface` || do_one done } # # Load kernel modules required for Shorewall # load_kernel_modules() { [ -z "$MODULESDIR" ] && \ MODULESDIR=/lib/modules/$osversion/kernel/net/ipv4/netfilter modules=`find_file modules` if [ -f $modules -a -d $MODULESDIR ]; then echo "Loading Modules..." . $modules fi } # Verify that the 'ip' program is installed verify_ip() { qt ip link ls ||\ startup_error "Shorewall $version requires the iproute package ('ip' utility)" } # # Determine which optional facilities are supported by iptables/netfilter # determine_capabilities() { qt iptables -t nat -L -n && NAT_ENABLED=Yes || NAT_ENABLED= qt iptables -t mangle -L -n && MANGLE_ENABLED=Yes || MANGLE_ENABLED= CONNTRACK_MATCH= MULTIPORT= if qt iptables -N fooX1234 ; then qt iptables -A fooX1234 -m conntrack --ctorigdst 192.168.1.1 -j ACCEPT && CONNTRACK_MATCH=Yes qt iptables -A fooX1234 -p tcp -m multiport --dports 21,22 -j ACCEPT && MULTIPORT=Yes qt iptables -F fooX1234 qt iptables -X fooX1234 fi } report_capability() # $1 = Capability Name, $2 Capability Setting (if any) { local setting= [ x$1 = "xYes" ] && { setting="Available"; shift; } || setting="Not available" echo " " $@: $setting } report_capabilities() { echo "Shorewall has detected the following iptables/netfilter capabilities:" report_capability $NAT_ENABLED "NAT" report_capability $MANGLE_ENABLED "Packet Mangling" report_capability $MULTIPORT "Multi-port Match" report_capability $CONNTRACK_MATCH "Connection Tracking Match" } # # Perform Initialization # - Delete all old rules # - Delete all user chains # - Set the POLICY on all standard chains and add a rule to allow packets # that are part of established connections # - Determine the zones # initialize_netfilter () { report_capabilities echo "Determining Zones..." determine_zones [ -z "$zones" ] && startup_error "No Zones Defined" display_list "Zones:" $zones echo "Validating interfaces file..." validate_interfaces_file echo "Validating hosts file..." validate_hosts_file echo "Validating Policy file..." validate_policy echo "Determining Hosts in Zones..." determine_interfaces determine_hosts run_user_exit init # # The some files might be large so strip them while the firewall is still running # (restart command). This reduces the length of time that the firewall isn't # accepting new connections. # strip_file rules strip_file proxyarp strip_file maclist strip_file nat terminator=fatal_error deletechain shorewall [ -n "$NAT_ENABLED" ] && delete_nat delete_proxy_arp [ -n "$MANGLE_ENABLED" ] && \ run_iptables -t mangle -F && \ run_iptables -t mangle -X [ -n "$CLEAR_TC" ] && delete_tc echo "Deleting user chains..." setpolicy INPUT DROP setpolicy OUTPUT DROP setpolicy FORWARD DROP deleteallchains setcontinue FORWARD setcontinue INPUT setcontinue OUTPUT # # Enable the Loopback interface # run_iptables -A INPUT -i lo -j ACCEPT run_iptables -A OUTPUT -o lo -j ACCEPT # # Allow DNS lookups during startup for FQDNs and deep-six INVALID packets # for chain in INPUT OUTPUT FORWARD; do run_iptables -A $chain -p udp --dport 53 -j ACCEPT run_iptables -A $chain -p ! icmp -m state --state INVALID -j DROP done [ -n "$CLAMPMSS" ] && \ run_iptables -A FORWARD -p tcp \ --tcp-flags SYN,RST SYN -j TCPMSS --clamp-mss-to-pmtu if [ -z "$NEWNOTSYN" ]; then createchain newnotsyn no for interface in `find_interfaces_by_option newnotsyn`; do run_iptables -A newnotsyn -i $interface -p tcp --tcp-flags ACK ACK -j ACCEPT run_iptables -A newnotsyn -i $interface -p tcp --tcp-flags RST RST -j ACCEPT run_iptables -A newnotsyn -i $interface -p tcp --tcp-flags FIN FIN -j ACCEPT run_iptables -A newnotsyn -i $interface -j RETURN done run_user_exit newnotsyn if [ -n "$LOGNEWNOTSYN" ]; then log_rule $LOGNEWNOTSYN newnotsyn DROP fi run_iptables -A newnotsyn -j DROP fi createchain icmpdef no createchain common no createchain reject no createchain dynamic no if [ -f /var/lib/shorewall/save ]; then echo "Restoring dynamic rules..." while read target ignore1 ignore2 address rest; do case $target in DROP|reject) run_iptables2 -A dynamic -s $address -j $target ;; *) ;; esac done < /var/lib/shorewall/save fi echo "Creating Interface Chains..." for interface in $all_interfaces; do createchain `forward_chain $interface` no run_iptables -A `forward_chain $interface` -j dynamic createchain `input_chain $interface` no run_iptables -A `input_chain $interface` -j dynamic done } # # Build the common chain -- called during [re]start and refresh # build_common_chain() { # # Common ICMP rules # run_user_exit icmpdef # # Common rules in each chain # common=`find_file common` if [ -f $common ]; then . $common else . `find_file common.def` fi # # New Not Syn Stuff # if [ -n "$NEWNOTSYN" ]; then run_iptables -A common -p tcp --tcp-flags ACK ACK -j ACCEPT run_iptables -A common -p tcp --tcp-flags RST RST -j ACCEPT run_iptables -A common -p tcp --tcp-flags FIN FIN -j ACCEPT fi # # BROADCASTS # drop_broadcasts `find_broadcasts` } # # Construct zone-independent rules # add_common_rules() { local savelogparms="$LOGPARMS" # # Reject Rules # run_iptables -A reject -p tcp -j REJECT --reject-with tcp-reset run_iptables -A reject -p udp -j REJECT # # Not all versions of iptables support these so don't complain if they don't work # qt iptables -A reject -p icmp -j REJECT --reject-with icmp-host-unreachable if ! qt iptables -A reject -j REJECT --reject-with icmp-host-prohibited; then # # In case the above doesn't work # run_iptables -A reject -j REJECT fi # # dropunclean rules # interfaces="`find_interfaces_by_option dropunclean`" if [ -n "$interfaces" ]; then createchain badpkt no if [ -n "$LOGUNCLEAN" ]; then LOGPARMS="$LOGPARMS --log-ip-options" log_rule $LOGUNCLEAN badpkt DROP -p ! tcp LOGPARMS="$LOGPARMS --log-tcp-options" log_rule $LOGUNCLEAN badpkt DROP -p tcp LOGPARMS="$savelogparms" fi run_iptables -A badpkt -j DROP echo "Mangled/Invalid Packet filtering enabled on:" for interface in $interfaces; do for chain in `first_chains $interface`; do run_iptables -A $chain --match unclean -j badpkt done echo " $interface" done fi # # logunclean rules # interfaces="`find_interfaces_by_option logunclean`" if [ -n "$interfaces" ]; then createchain logpkt no [ -z"$LOGUNCLEAN" ] && LOGUNCLEAN=info LOGPARMS="$LOGPARMS --log-ip-options" log_rule $LOGUNCLEAN logpkt DROP -p ! tcp LOGPARMS="$LOGPARMS --log-tcp-options" log_rule $LOGUNCLEAN logpkt DROP -p tcp LOGPARMS="$savelogparms" echo "Mangled/Invalid Packet Logging enabled on:" for interface in $interfaces; do for chain in `first_chains $interface`; do run_iptables -A $chain --match unclean -j logpkt done echo " $interface" done fi build_common_chain # # DHCP # echo "Adding rules for DHCP" for interface in `find_interfaces_by_option dhcp`; do run_iptables -A `input_chain $interface` -p udp --dport 67:68 -j ACCEPT run_iptables -A OUTPUT -o $interface -p udp --dport 67:68 -j ACCEPT done # # RFC 1918 # norfc1918_interfaces="`find_interfaces_by_option norfc1918`" if [ -n "$norfc1918_interfaces" ]; then echo "Enabling RFC1918 Filtering" strip_file rfc1918 createchain rfc1918 no createchain logdrop no log_rule $RFC1918_LOG_LEVEL logdrop DROP run_iptables -A logdrop -j DROP if [ -n "$MANGLE_ENABLED" -a -z "$CONNTRACK_MATCH" ]; then # # Mangling is enabled but conntrack match isn't available -- # create a chain in the mangle table to filter RFC1918 destination # addresses. This must be done in the mangle table before we apply # any DNAT rules in the nat table # # Also add a chain to log and drop any RFC1918 packets that we find # run_iptables -t mangle -N man1918 run_iptables -t mangle -N logdrop log_rule $RFC1918_LOG_LEVEL logdrop DROP -t mangle run_iptables -t mangle -A logdrop -j DROP fi while read subnet target; do case $target in logdrop|DROP|RETURN) ;; *) fatal_error "Illegal target ($target) for $subnet" ;; esac run_iptables2 -A rfc1918 -s $subnet -j $target if [ -n "$CONNTRACK_MATCH" ]; then # # We have connection tracking match -- match on the original destination # run_iptables2 -A rfc1918 -m conntrack --ctorigdst $subnet -j $target elif [ -n "$MANGLE_ENABLED" ]; then # # No connection tracking match but we have mangling -- add a rule to # the mangle table # run_iptables2 -t mangle -A man1918 -d $subnet -j $target fi done < $TMP_DIR/rfc1918 for interface in $norfc1918_interfaces; do for chain in `first_chains $interface`; do run_iptables -A $chain -m state --state NEW -j rfc1918 done [ -n "$MANGLE_ENABLED" -a -z "$CONNTRACK_MATCH" ] && \ run_iptables -t mangle -A PREROUTING -m state --state NEW -i $interface -j man1918 done fi interfaces=`find_interfaces_by_option tcpflags` if [ -n "$interfaces" ]; then echo "Setting up TCP Flags checking..." createchain tcpflags no if [ -n "$TCP_FLAGS_LOG_LEVEL" ]; then createchain logflags no savelogparms="$LOGPARMS" LOGPARMS="$LOGPARMS --log-ip-options" log_rule $TCP_FLAGS_LOG_LEVEL logflags $TCP_FLAGS_DISPOSITION LOGPARMS="$savelogparms" case $TCP_FLAGS_DISPOSITION in REJECT) run_iptables -A logflags -j REJECT --reject-with tcp-reset ;; *) run_iptables -A logflags -j $TCP_FLAGS_DISPOSITION ;; esac disposition="-j logflags" else disposition="-j $TCP_FLAGS_DISPOSITION" fi run_iptables -A tcpflags -p tcp --tcp-flags ALL FIN,URG,PSH $disposition run_iptables -A tcpflags -p tcp --tcp-flags ALL NONE $disposition run_iptables -A tcpflags -p tcp --tcp-flags SYN,RST SYN,RST $disposition run_iptables -A tcpflags -p tcp --tcp-flags SYN,FIN SYN,FIN $disposition # # There are a lot of probes to ports 80, 3128 and 8080 that use a source # port of 0. This catches them even if they are directed at an IP that # hosts a web server. # run_iptables -A tcpflags -p tcp --syn --sport 0 $disposition for interface in $interfaces; do for chain in `first_chains $interface`; do run_iptables -A $chain -p tcp -j tcpflags done done fi # # Process Black List # setup_blacklist # # Route Filtering # for f in /proc/sys/net/ipv4/conf/*/rp_filter; do echo 0 > $f done interfaces="`find_interfaces_by_option routefilter`" if [ -n "$interfaces" -o -n "$ROUTE_FILTER" ]; then echo "Setting up Kernel Route Filtering..." if [ -n "$ROUTE_FILTER" ]; then echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter else echo 0 > /proc/sys/net/ipv4/conf/all/rp_filter for interface in $interfaces; do file=/proc/sys/net/ipv4/conf/$interface/rp_filter if [ -f $file ]; then echo 1 > $file else error_message \ "Warning: Cannot set route filtering on $interface" fi done fi fi # # IP Forwarding # case "$IP_FORWARDING" in [Oo][Nn]) echo 1 > /proc/sys/net/ipv4/ip_forward echo "IP Forwarding Enabled" ;; [Oo][Ff][Ff]) echo 0 > /proc/sys/net/ipv4/ip_forward echo "IP Forwarding Disabled!" ;; esac } # # Scan the policy file defining the necessary chains # Add the appropriate policy rule(s) to the end of each canonical chain # apply_policy_rules() { # # Create policy chains # for chain in $all_policy_chains; do eval policy=\$${chain}_policy eval loglevel=\$${chain}_loglevel eval synparams=\$${chain}_synparams [ -n "$synparams" ] && setup_syn_flood_chain $chain $synparams if havechain $chain; then [ -n "$synparams" ] && \ run_iptables -I $chain 2 -p tcp --syn -j @$chain else # # The chain doesn't exist. Create the chain and add policy # rules # # We must include the ESTABLISHED and RELATED state # rule here to account for replys and reverse # related sessions associated with sessions going # in the other direction # createchain $chain yes # # If either client or server is 'all' then this MUST be # a policy chain and we must apply the appropriate policy rules # # Otherwise, this is a canonical chain which will be handled in # the for loop below # case $chain in all2*|*2all) policy_rules $chain $policy $loglevel ;; esac [ -n "$synparams" ] && \ [ $policy = ACCEPT -o $policy = CONTINUE ] && \ run_iptables -I $chain 2 -p tcp --syn -j @$chain fi done # # Add policy rules to canonical chains # for zone in $FW $zones; do for zone1 in $FW $zones; do chain=${zone}2${zone1} if havechain $chain; then run_user_exit $chain default_policy $zone $zone1 fi done done } # # Activate the rules # activate_rules() { local PREROUTING_rule=1 local POSTROUTING_rule=1 # # Jump to a NAT chain from one of the builtin nat chains # addnatjump() # $1 = BUILTIN chain, $2 = user chain, $3 - * other arguments { local sourcechain=$1 destchain=$2 shift shift havenatchain $destchain && \ run_iptables -t nat -A $sourcechain $@ -j $destchain } # # Jump to a RULES chain from one of the builtin nat chains # # If NAT_BEFORE_RULES then append the rule to the chain; otherwise, insert # the jump near the front of the builtin chain # addrulejump() # $1 = BUILTIN chain, $2 = user chain, $3 - * other arguments { local sourcechain=$1 destchain=$2 shift shift if havenatchain $destchain; then if [ -n "$NAT_BEFORE_RULES" ]; then run_iptables -t nat -A $sourcechain $@ -j $destchain else eval run_iptables -t nat -I $sourcechain \ \$${sourcechain}_rule $@ -j $destchain eval ${sourcechain}_rule=\$\(\(\$${sourcechain}_rule + 1\)\) fi fi } # # Add jumps from the builtin chains to the nat chains # addnatjump PREROUTING nat_in addnatjump POSTROUTING nat_out for interface in $all_interfaces; do addnatjump PREROUTING `input_chain $interface` -i $interface addnatjump POSTROUTING `output_chain $interface` -o $interface done > ${STATEDIR}/chains > ${STATEDIR}/zones for zone in $zones; do eval source_hosts=\$${zone}_hosts echo $zone $source_hosts >> ${STATEDIR}/zones chain1=`rules_chain $FW $zone` chain2=`rules_chain $zone $FW` eval complex=\$${zone}_is_complex if [ -n "$complex" ]; then frwd_chain=${zone}_frwd createchain $frwd_chain No fi echo "$FW $zone $chain1" >> ${STATEDIR}/chains echo "$zone $FW $chain2" >> ${STATEDIR}/chains for host in $source_hosts; do interface=${host%:*} subnet=${host#*:} run_iptables -A OUTPUT -o $interface -d $subnet -j $chain1 # # Add jumps from the builtin chains for DNAT and SNAT rules # addrulejump PREROUTING `dnat_chain $zone` -i $interface -s $subnet addrulejump POSTROUTING `snat_chain $zone` -o $interface -d $subnet run_iptables -A `input_chain $interface` -s $subnet -j $chain2 [ -n "$complex" ] && \ run_iptables -A `forward_chain $interface` -s $subnet -j $frwd_chain done for zone1 in $zones; do eval policy=\$${zone}2${zone1}_policy [ "$policy" = NONE ] && continue eval dest_hosts=\$${zone1}_hosts chain="`rules_chain $zone $zone1`" echo "$zone $zone1 $chain" >> ${STATEDIR}/chains if [ $zone = $zone1 ]; then eval routeback=\"\$${zone}_routeback\" else routeback= fi for host in $source_hosts; do interface=${host%:*} if [ -n "$complex" ]; then chain1=$frwd_chain else chain1=`forward_chain $interface` fi for host1 in $dest_hosts; do interface1=${host1%:*} subnet1=${host1#*:} if [ "$host" != "$host1" ] || list_search $host $routeback; then run_iptables -A $chain1 -o $interface1 -d $subnet1 -j $chain fi done done done done for interface in $all_interfaces; do run_iptables -A FORWARD -i $interface -j `forward_chain $interface` run_iptables -A INPUT -i $interface -j `input_chain $interface` addnatjump POSTROUTING `masq_chain $interface` -o $interface done complete_standard_chain INPUT all $FW complete_standard_chain OUTPUT $FW all complete_standard_chain FORWARD all all # # Remove rules added to keep the firewall alive during [re]start" # for chain in INPUT OUTPUT FORWARD; do run_iptables -D $chain -m state --state ESTABLISHED,RELATED -j ACCEPT run_iptables -D $chain -p udp --dport 53 -j ACCEPT done } # # Start/Restart the Firewall # define_firewall() # $1 = Command (Start or Restart) { if [ -f /etc/shorewall/startup_disabled ]; then echo " Shorewall Startup is disabled -- to enable startup" echo " after you have completed Shorewall configuration," echo " remove the file /etc/shorewall/startup_disabled" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 2 fi echo "${1}ing Shorewall..." verify_os_version verify_ip load_kernel_modules echo "Initializing..." initialize_netfilter echo "Configuring Proxy ARP" setup_proxy_arp setup_nat echo "Adding Common Rules" add_common_rules tunnels=`find_file tunnels` [ -f $tunnels ] && \ echo "Processing $tunnels..." && setup_tunnels $tunnels maclist_hosts=`find_hosts_by_option maclist` if [ -n "$maclist_hosts" ] ; then setup_mac_lists fi rules=`find_file rules` echo "Processing $rules..." process_rules $rules policy=`find_file policy` echo "Processing $policy..." apply_policy_rules masq=`find_file masq` [ -f $masq ] && setup_masq $masq tos=`find_file tos` [ -f $tos ] && [ -n "$MANGLE_ENABLED" ] && process_tos $tos ecn=`find_file ecn` [ -f $ecn ] && [ -n "$MANGLE_ENABLED" ] && setup_ecn $ecn [ -n "$TC_ENABLED" ] && setup_tc echo "Activating Rules..." activate_rules [ -n "$aliases_to_add" ] && \ echo "Adding IP Addresses..." && \ add_ip_aliases run_user_exit start createchain shorewall no date > $STATEDIR/restarted report "Shorewall ${1}ed" rm -rf $TMP_DIR } # # Rebuild the common chain # refresh_firewall() { echo "Refreshing Shorewall..." echo "Determining Zones and Interfaces..." determine_zones validate_interfaces_file [ -z "$zones" ] && startup_error "No Zones Defined" determine_interfaces run_user_exit refresh run_iptables -F common echo "Adding Common Rules" build_common_chain # # Blacklist # refresh_blacklist ecn=`find_file ecn` [ -f $ecn ] && [ -n "$MANGLE_ENABLED" ] && setup_ecn $ecn # # Refresh Traffic Control # [ -n "$TC_ENABLED" ] && refresh_tc report "Shorewall Refreshed" rm -rf $TMP_DIR } # # Add a host or subnet to a zone # add_to_zone() # $1 = [:] $2 = zone { local base nat_chain_exists() # $1 = chain name { qt iptables -t nat -L $1 -n } do_iptables() # $@ = command { if ! iptables $@ ; then startup_error "Can't add $1 to zone $2" fi } output_rule_num() { local num=`iptables -L OUTPUT -n --line-numbers | grep icmp | cut -d' ' -f1 | head -n1` [ -n "$num" ] && echo $(($num+1)) } # # Isolate interface and host parts # interface=${1%:*} host=${1#*:} [ -z "$host" ] && host="0.0.0.0/0" # # Load $zones # determine_zones # # Validate Zone # zone=$2 validate_zone $zone || startup_error "Unknown zone: $zone" [ "$zone" = $FW ] && startup_error "Can't add $1 to firewall zone" # # Be sure that Shorewall has been restarted using a DZ-aware version of the code # [ -f ${STATEDIR}/chains ] || startup_error "${STATEDIR}/chains -- file not found" [ -f ${STATEDIR}/zones ] || startup_error "${STATEDIR}/zones -- file not found" # # Be sure that the interface was present at last [re]start # if ! chain_exists `input_chain $interface` ; then startup_error "Unknown interface $interface" fi # # Build lists of interfaces with special rules # dhcp_interfaces=`find_interfaces_by_option dhcp` blacklist_interfaces=`find_interfaces_by_option blacklist` maclist_interfaces=`find_interfaces_by_option maclist` tcpflags_interfaces=`find_interfaces_by_option tcpflags` # # Normalize the first argument to this function # newhost="$interface:$host" terminator=fatal_error # # Create a new Zone state file # > ${STATEDIR}/zones_$$ # # Add $1 to the Zone state file # while read z hosts; do if [ "$z" = "$zone" ]; then for h in $hosts; do if [ "$h" = "$newhost" ]; then rm -f ${STATEDIR}/zones_$$ startup_error "$1 already in zone $zone" fi done [ -z "$hosts" ] && hosts=$newhost || hosts="$hosts $newhost" fi eval ${z}_hosts=\"$hosts\" echo "$z $hosts" >> ${STATEDIR}/zones_$$ done < ${STATEDIR}/zones mv -f ${STATEDIR}/zones_$$ ${STATEDIR}/zones # # If the zone passed in the command has a dnat chain then insert a rule in # the nat table PREROUTING chain to jump to that chain when the source # matches the new host(s)# # chain=${zone}_dnat if nat_chain_exists $chain; then do_iptables -t nat -I PREROUTING -i $interface -s $host -j $chain fi # # Insert new rules into the input chains for the passed interface # while read z1 z2 chain; do if [ "$z1" = "$zone" ]; then if [ "$z2" = "$FW" ]; then # # We will insert the rule right after the DHCP, 'ping' and # MAC rules (if any) # if list_search $interface $dhcp_interfaces; then rulenum=3 else rulenum=2 fi if list_search $interface $maclist_interfaces; then rulenum=$(($rulenum + 1)) fi if list_search $interface $tcpflags_interfaces; then rulenum=$(($rulenum + 1)) fi do_iptables -I `input_chain $interface` $rulenum -s $host -j $chain else # # Insert rules into the passed interface's forward chain # # We insert them after any blacklist/MAC verification rules # source_chain=`forward_chain $interface` eval dest_hosts=\"\$${z2}_hosts\" base=`chain_base $interface` eval rulenum=\$${base}_rulenum if [ -z "$rulenum" ]; then if list_search $interface $blacklist_interfaces; then rulenum=3 else rulenum=2 fi if list_search $interface $maclist_interfaces; then rulenum=$(($rulenum + 1)) fi if list_search $interface $tcpflags_interfaces; then rulenum=$(($rulenum + 1)) fi fi for h in $dest_hosts; do iface=${h%:*} hosts=${h#*:} if [ "$iface" != "$interface" -o "$hosts" != "$host" ]; then do_iptables -I $source_chain $rulenum -s $host -o $iface -d $hosts -j $chain rulenum=$(($rulenum + 1)) fi done eval ${base}_rulenum=$rulenum fi elif [ "$z2" = "$zone" ]; then if [ "$z1" = "$FW" ]; then # # Add a rule to the OUTPUT chain -- always after the icmp * ACCEPT rule # do_iptables -I OUTPUT `output_rule_num` -o $interface -d $host -j $chain else # # Insert rules into the source interface's forward chain # # We insert them after any blacklist rules # eval source_hosts=\"\$${z1}_hosts\" for h in $source_hosts; do iface=${h%:*} hosts=${h#*:} base=`chain_base $iface` eval rulenum=\$${base}_rulenum if [ -z "$rulenum" ]; then if list_search $iface $blacklist_interfaces; then rulenum=3 else rulenum=2 fi fi if [ "$iface" != "$interface" -o "$hosts" != "$host" ]; then do_iptables -I `forward_chain $iface` $rulenum -s $hosts -o $interface -d $host -j $chain rulenum=$(($rulenum + 1)) fi eval ${base}_rulenum=$rulenum done fi fi done < ${STATEDIR}/chains rm -rf $TMP_DIR echo "$1 added to zone $2" } # # Delete a host or subnet from a zone # delete_from_zone() # $1 = [:] $2 = zone { # # Delete the subnect host(s) from the zone state file # delete_from_zones_file() { > ${STATEDIR}/zones_$$ while read z hosts; do if [ "$z" = "$zone" ]; then temp=$hosts hosts= for h in $temp; do if [ "$h" = "$delhost" ]; then echo Yes else hosts="$hosts $h" fi done fi echo "$z $hosts" >> ${STATEDIR}/zones_$$ done < ${STATEDIR}/zones mv -f ${STATEDIR}/zones_$$ ${STATEDIR}/zones } # # Isolate interface and host parts # interface=${1%:*} host=${1#*:} [ -z "$host" ] && host="0.0.0.0/0" # # Load $zones # determine_zones zone=$2 validate_zone $zone || startup_error "Unknown zone: $zone" [ "$zone" = $FW ] && startup_error "Can't remove $1 from firewall zone" # # Be sure that Shorewall has been restarted using a DZ-aware version of the code # [ -f ${STATEDIR}/chains ] || startup_error "${STATEDIR}/chains -- file not found" [ -f ${STATEDIR}/zones ] || startup_error "${STATEDIR}/zones -- file not found" # # Be sure that the interface was present at last [re]start # if ! chain_exists `input_chain $interface` ; then startup_error "Unknown interface $interface" fi # # Normalize the first argument to this function # delhost="$interface:$host" # # Delete the passed hosts from the zone state file # [ -z "`delete_from_zones_file`" ] && \ error_message "Warning: $1 does not appear to be in zone $2" # # Construct the zone host maps # while read z hosts; do eval ${z}_hosts=\"$hosts\" done < ${STATEDIR}/zones terminator=fatal_error # # Delete any nat table entries for the host(s) # qt iptables -t nat -D PREROUTING -i $interface -s $host -j ${zone}_dnat # # Delete rules rules the input chains for the passed interface # while read z1 z2 chain; do if [ "$z1" = "$zone" ]; then if [ "$z2" = "$FW" ]; then qt iptables -D `input_chain $interface` -s $host -j $chain else source_chain=`forward_chain $interface` eval dest_hosts=\"\$${z2}_hosts\" for h in $dest_hosts $delhost; do iface=${h%:*} hosts=${h#*:} if [ "$iface" != "$interface" -o "$hosts" != "$host" ]; then qt iptables -D $source_chain -s $host -o $iface -d $hosts -j $chain fi done fi elif [ "$z2" = "$zone" ]; then if [ "$z1" = "$FW" ]; then qt iptables -D OUTPUT -o $interface -d $host -j $chain else eval source_hosts=\"\$${z1}_hosts\" for h in $source_hosts; do iface=${h%:*} hosts=${h#*:} if [ "$iface" != "$interface" -o "$hosts" != "$host" ]; then qt iptables -D `forward_chain $iface` -s $hosts -o $interface -d $host -j $chain fi done fi fi done < ${STATEDIR}/chains rm -rf $TMP_DIR echo "$1 removed from zone $2" } # # Determine the value for a parameter that defaults to Yes # added_param_value_yes() # $1 = Parameter Name, $2 = Parameter value { local val="$2" if [ -z "$val" ]; then echo "Yes" else case $val in [Yy][Ee][Ss]) echo "Yes" ;; [Nn][Oo]) echo "" ;; *) startup_error "Invalid value ($val) for $1" ;; esac fi } # # Determine the value for a parameter that defaults to No # added_param_value_no() # $1 = Parameter Name, $2 = Parameter value { local val="$2" if [ -z "$val" ]; then echo "" else case $val in [Yy][Ee][Ss]) echo "Yes" ;; [Nn][Oo]) echo "" ;; *) startup_error "Invalid value ($val) for $1" ;; esac fi } # # Initialize this program # do_initialize() { # # Code to determine if shell can support xor # check_xor() { echo $(( 256 ^ -1 )) } check_xor1() { local x=`check_xor 2> /dev/null` [ -n "$x" ] && echo $x || echo 0 } # Run all utility programs using the C locale # # Thanks to Vincent Planchenault for this tip # export LC_ALL=C PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin # # Establish termination function # terminator=startup_error # # Clear all configuration variables # version= FW= SUBSYSLOCK= STATEDIR= ALLOWRELATED=Yes LOGRATE= LOGBURST= LOGPARMS= ADD_IP_ALIASES= ADD_SNAT_ALIASES= TC_ENABLED= LOGUNCLEAN= BLACKLIST_DISPOSITION= BLACKLIST_LOGLEVEL= CLAMPMSS= ROUTE_FILTER= NAT_BEFORE_RULES= DETECT_DNAT_IPADDRS= MUTEX_TIMEOUT= NEWNOTSYN= LOGNEWNOTSYN= FORWARDPING= MACLIST_DISPOSITION= MACLIST_LOG_LEVEL= TCP_FLAGS_DISPOSITION= TCP_FLAGS_LOG_LEVEL= RFC1918_LOG_LEVEL= MARK_IN_FORWARD_CHAIN= SHARED_DIR=/usr/share/shorewall FUNCTIONS= VERSION_FILE= LOGFORMAT= LOGRULENUMBERS= stopping= have_mutex= masq_seq=1 nonat_seq=1 aliases_to_add= TMP_DIR=/tmp/shorewall-$$ rm -rf $TMP_DIR mkdir -p $TMP_DIR && chmod 700 $TMP_DIR || \ startup_error "Can't create $TMP_DIR" trap "rm -rf $TMP_DIR; my_mutex_off; exit 2" 1 2 3 4 5 6 9 FUNCTIONS=$SHARED_DIR/functions if [ -f $FUNCTIONS ]; then . $FUNCTIONS else startup_error "$FUNCTIONS does not exist!" fi VERSION_FILE=$SHARED_DIR/version [ -f $VERSION_FILE ] && version=`cat $VERSION_FILE` run_user_exit params config=`find_file shorewall.conf` if [ -f $config ]; then echo "Processing $config..." . $config else echo "$config does not exist!" >&2 exit 2 fi [ -z "${STATEDIR}" ] && STATEDIR=/var/state/shorewall [ -d $STATEDIR ] || mkdir -p $STATEDIR [ -z "$FW" ] && FW=fw ALLOWRELATED="`added_param_value_yes ALLOWRELATED $ALLOWRELATED`" [ -n "$ALLOWRELATED" ] || \ startup_error "ALLOWRELATED=No is not supported" ADD_IP_ALIASES="`added_param_value_yes ADD_IP_ALIASES $ADD_IP_ALIASES`" TC_ENABLED="`added_param_value_yes TC_ENABLED $TC_ENABLED`" if [ -n "${LOGRATE}${LOGBURST}" ]; then LOGPARMS="--match limit" [ -n "$LOGRATE" ] && LOGPARMS="$LOGPARMS --limit $LOGRATE" [ -n "$LOGBURST" ] && LOGPARMS="$LOGPARMS --limit-burst $LOGBURST" fi if [ -n "$IP_FORWARDING" ]; then case "$IP_FORWARDING" in [Oo][Nn]|[Oo][Ff][Ff]|[Kk][Ee][Ee][Pp]) ;; *) startup_error "Invalid value ($IP_FORWARDING) for IP_FORWARDING" ;; esac else IP_FORWARDING=On fi if [ -n "$TC_ENABLED" -a -z "$MANGLE_ENABLED" ]; then startup_error "Traffic Control requires Mangle" fi [ -z "$BLACKLIST_DISPOSITION" ] && BLACKLIST_DISPOSITION=DROP CLAMPMSS=`added_param_value_no CLAMPMSS $CLAMPMSS` ADD_SNAT_ALIASES=`added_param_value_no ADD_SNAT_ALIASES $ADD_SNAT_ALIASES` ROUTE_FILTER=`added_param_value_no ROUTE_FILTER $ROUTE_FILTER` NAT_BEFORE_RULES=`added_param_value_yes NAT_BEFORE_RULES $NAT_BEFORE_RULES` DETECT_DNAT_IPADDRS=`added_param_value_no DETECT_DNAT_IPADDRS $DETECT_DNAT_IPADDRS` FORWARDPING=`added_param_value_no FORWARDPING $FORWARDPING` [ -n "$FORWARDPING" ] && \ startup_error "FORWARDPING=Yes is no longer supported" NEWNOTSYN=`added_param_value_yes NEWNOTSYN $NEWNOTSYN` maclist_target=reject if [ -n "$MACLIST_DISPOSITION" ] ; then case $MACLIST_DISPOSITION in REJECT) ;; ACCEPT|DROP) maclist_target=$MACLIST_DISPOSITION ;; *) startup_error "Invalid value ($MACLIST_DISPOSITION) for MACLIST_DISPOSITION" ;; esac else MACLIST_DISPOSITION=REJECT fi if [ -n "$TCP_FLAGS_DISPOSITION" ] ; then case $TCP_FLAGS_DISPOSITION in REJECT|ACCEPT|DROP) ;; *) startup_error "Invalid value ($TCP_FLAGS_DISPOSITION) for TCP_FLAGS_DISPOSITION" ;; esac else TCP_FLAGS_DISPOSITION=DROP fi [ -z "$RFC1918_LOG_LEVEL" ] && RFC1918_LOG_LEVEL=info MARK_IN_FORWARD_CHAIN=`added_param_value_no MARK_IN_FORWARD_CHAIN $MARK_IN_FORWARD_CHAIN` [ -n "$MARK_IN_FORWARD_CHAIN" ] && marking_chain=tcfor || marking_chain=tcpre if [ -n "$TC_ENABLED" ]; then CLEAR_TC=`added_param_value_yes CLEAR_TC $CLEAR_TC` else CLEAR_TC= fi if [ -n "$LOGFORMAT" ]; then if [ -n "`echo $LOGFORMAT | grep '%d'`" ]; then LOGRULENUMBERS=Yes temp=`printf "$LOGFORMAT" fooxx 1 barxx 2> /dev/null` if [ $? -ne 0 ]; then startup_error "Invalid LOGFORMAT string: \"$LOGFORMAT\"" fi else temp=`printf "$LOGFORMAT" fooxx barxx 2> /dev/null` if [ $? -ne 0 ]; then startup_error "Invalid LOGFORMAT string: \"$LOGFORMAT\"" fi fi if [ ${#temp} -gt 29 ]; then startup_error "LOGFORMAT string is too long: \"$LOGFORMAT\"" fi else LOGFORMAT="Shorewall:%s:%s:" fi # # Strip the files that we use often # strip_file interfaces strip_file hosts # # So that emacs doesn't get lost, we use $LEFTSHIFT rather than << # LEFTSHIFT='<<' # # Determine the capabilities of the installed iptables/netfilter # determine_capabilities # # Check out the user's shell # [ -n "$SHOREWALL_SHELL" ] || SHOREWALL_SHELL=/bin/sh temp=`decodeaddr 192.168.1.1` if [ `encodeaddr $temp` != 192.168.1.1 -o `check_xor1` -ne -257 ]; then startup_error "Shell $SHOREWALL_SHELL is broken and may not be used with Shorewall" fi } # # Give Usage Information # usage() { echo "Usage: $0 [debug] {start|stop|reset|restart|status|refresh|clear|{add|delete} [:hosts] zone}}" exit 1 } # # E X E C U T I O N B E G I N S H E R E # # # Start trace if first arg is "debug" # [ $# -gt 1 ] && [ "$1" = "debug" ] && { set -x ; shift ; } nolock= [ $# -gt 1 ] && [ "$1" = "nolock" ] && { nolock=Yes; shift ; } trap "my_mutex_off; exit 2" 1 2 3 4 5 6 9 command="$1" case "$command" in stop) [ $# -ne 1 ] && usage do_initialize my_mutex_on echo -n "Stopping Shorewall..." stop_firewall [ -n "$SUBSYSLOCK" ] && rm -f $SUBSYSLOCK echo "done." my_mutex_off ;; start) [ $# -ne 1 ] && usage do_initialize my_mutex_on if qt iptables -L shorewall -n ; then [ -n "$SUBSYSLOCK" ] && touch $SUBSYSLOCK echo "Shorewall Already Started" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 0; fi define_firewall "Start" && [ -n "$SUBSYSLOCK" ] && touch $SUBSYSLOCK my_mutex_off ;; restart) [ $# -ne 1 ] && usage do_initialize my_mutex_on if qt iptables -L shorewall -n ; then define_firewall "Restart" else echo "Shorewall Not Currently Running" define_firewall "Start" fi [ $? -eq 0 ] && [ -n "$SUBSYSLOCK" ] && touch $SUBSYSLOCK my_mutex_off ;; status) [ $# -ne 1 ] && usage echo "Shorewall-$version Status at $HOSTNAME - `date`" echo iptables -L -n -v ;; reset) [ $# -ne 1 ] && usage do_initialize my_mutex_on if ! qt iptables -L shorewall -n ; then echo "Shorewall Not Started" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 2; fi iptables -Z iptables -t nat -Z iptables -t mangle -Z report "Shorewall Counters Reset" date > $STATEDIR/restarted my_mutex_off ;; refresh) [ $# -ne 1 ] && usage do_initialize my_mutex_on if ! qt iptables -L shorewall -n ; then echo "Shorewall Not Started" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 2; fi refresh_firewall; my_mutex_off ;; clear) [ $# -ne 1 ] && usage do_initialize my_mutex_on echo -n "Clearing Shorewall..." clear_firewall [ -n "$SUBSYSLOCK" ] && rm -f $SUBSYSLOCK echo "done." my_mutex_off ;; check) [ $# -ne 1 ] && usage do_initialize check_config ;; add) [ $# -ne 3 ] && usage do_initialize my_mutex_on if ! qt iptables -L shorewall -n ; then echo "Shorewall Not Started" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 2; fi add_to_zone $2 $3 my_mutex_off ;; delete) [ $# -ne 3 ] && usage do_initialize my_mutex_on if ! qt iptables -L shorewall -n ; then echo "Shorewall Not Started" [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR my_mutex_off exit 2; fi delete_from_zone $2 $3 my_mutex_off ;; *) usage ;; esac