#!/bin/sh # # The Shoreline Firewall (Shorewall) Packet Filtering Firewall Compiler - V3.2 # # This program is under GPL [http://www.gnu.org/copyleft/gpl.htm] # # (c) 1999,2000,2001,2002,2003,2004,2005,2006 - Tom Eastep (teastep@shorewall.net) # # tcstart from tc4shorewall Version 0.5 # (c) 2005 Arne Bernin # Modified by Tom Eastep for integration into the Shorewall distribution # published under GPL Version 2# # # 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: # # compile check Verify the configuration files. # compile compile Compile into # # Environmental Variables: # # EXPORT=Yes -e option specified to /sbin/shorewall # SHOREWALL_DIR A directory name was passed to /sbin/shorewall # VERBOSE Standard Shorewall verbosity control. # Fatal error -- stops the compiler after issuing the error message # fatal_error() # $* = Error Message { echo " ERROR: $@" >&2 [ -n "$TMP_DIR" ] && rm -rf $TMP_DIR [ -n "$OUTPUT" ] && rm -f $OUTPUT kill $$ exit 2 } # # Write the passed args to the compiler output file. # save_command() { [ $# -gt 0 ] && echo "${INDENT}${@}" >&3 || echo >&3 } save_command_unindented() { echo "${@}" >&3 } # # Write a progress_message2 command to the output file. # save_progress_message() { echo >&3 echo "${INDENT}progress_message2 \"$@\"" >&3 echo >&3 } save_progress_message_short() { echo "${INDENT}progress_message \"$@\"" >&3 } progress_message_and_save() { progress_message "$@" echo "${INDENT}progress_message \"$@\"" >&3 } # # Echo the contents of the passed file indented by $INDENT # indent() { if [ -n "$INDENT" ]; then if [ -n "$HAVEAWK" ]; then eval awk \''BEGIN { indent=1; }; /^[[:space:]]*$/ { print ""; indent=1; next; }; { if (indent == 1) print "'"$INDENT"'" $0; else print; }; { indent=1; }; /\\$/ { indent=0; };'\' $1 else eval sed \'s\/^/"$INDENT"\/\' $1 fi else cat $1 fi } # # Append a file to the compiler's output with indentation. # append_file() # $1 = File Name { local user_exit=$(find_file $1) if [ -f $user_exit ]; then save_progress_message "Processing $user_exit ..." indent $user_exit >&3 fi } # # Generate a command to run iptables # do_iptables() { save_command \$IPTABLES $@ } # # Generate an IPTABLES command. Include hacks to work around iptables limitations # run_iptables() { if [ -z "$KLUDGEFREE" ]; then # # Purge the temporary files that we use to prevent duplicate '-m' specifications # [ -n "$BRIDGING" ] && [ -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev [ -n "$IPRANGE_MATCH" ] && [ -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange fi save_command "$IPTABLES_COMMAND $@" } # # Version of 'run_iptables' that inserts white space after "!" in the arg list # run_iptables2() { if [ -z "$KLUDGEFREE" ]; then # # Purge the temporary files that we use to prevent duplicate '-m' specifications # [ -n "$BRIDGING" ] && [ -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev [ -n "$IPRANGE_MATCH" ] && [ -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange fi save_command run_iptables $(fix_bang $@) } # # Generate command to quietly run iptables # qt_iptables() { if [ -z "$KLUDGEFREE" ]; then # # Purge the temporary files that we use to prevent duplicate '-m' specifications # [ -n "$BRIDGING" ] && [ -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev [ -n "$IPRANGE_MATCH" ] && [ -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange fi save_command qt \$IPTABLES $@ } # # Generate a command to run tc # run_tc() { save_command run_tc $@ } # # Add the implicit ACCEPT rules at the end of a rules file section # finish_chain_section() # $1 = canonical chain $2 = state list { local policy policychain [ -n "$FASTACCEPT" ] || run_iptables -A $1 -m state --state $2 -j ACCEPT if list_search RELATED $(separate_list $2) ; then if is_policy_chain $1 ; then if eval test -n \"\$${1}_synparams\" ; then if [ $SECTION = DONE ]; then eval policy=\$${1}_policy case $policy in ACCEPT|CONTINUE|QUEUE) run_iptables -A $1 -p tcp --syn -j @$1 ;; esac else run_iptables -A $1 -p tcp --syn -j @$1 fi fi else eval policychain=\$${1}_policychain if eval test -n \"\$${policychain}_synparams\" ; then run_iptables -A $1 -p tcp --syn -j @$policychain fi fi fi } finish_section() # $1 = Section(s) { local zone zone1 chain for zone in $ZONES $FW; do for zone1 in $ZONES $FW; do chain=${zone}2${zone1} if havechain $chain; then finish_chain_section $chain $1 fi done done } # # Create a filter chain # # If the chain isn't one of the common chains then add a rule to the chain # allowing packets that are part of an established connection. Create a # variable exists_${1} and set its value to Yes to indicate that the chain now # exists. # createchain() # $1 = chain name, $2 = If "yes", do section-end processing { local c=$(chain_base $1) run_iptables -N $1 if [ $2 = yes ]; then case $SECTION in NEW|DONE) finish_chain_section $1 ESTABLISHED,RELATED ;; RELATED) finish_chain_section $1 ESTABLISHED ;; esac fi eval exists_${c}=Yes } createchain2() # $1 = chain name, $2 = If "yes", create default rules { local c=$(chain_base $1) ensurechain $1 if [ $2 = yes ]; then case $SECTION in NEW|DONE) finish_chain_section $1 ESTABLISHED,RELATED ;; RELATED) finish_chain_section $1 ESTABLISHED ;; esac fi eval exists_${c}=Yes } # # Determine if a chain exists # # When we create a chain "x", we create a variable named exists_x and # set its value to Yes. This function tests for the "exists_" variable # corresponding to the passed chain having the value of "Yes". # havechain() # $1 = name of chain { local c=$(chain_base $1) eval test \"\$exists_${c}\" = Yes } # # Ensure that a chain exists (create it if it doesn't) # ensurechain() # $1 = chain name { havechain $1 || createchain $1 yes } ensurechain1() # $1 = chain name { havechain $1 || createchain $1 no } # # 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 $@ } addrule2() # $1 = chain name, remainder of arguments specify the rule { ensurechain $1 run_iptables2 -A $@ } # # Query NetFilter about the existence of a filter chain # chain_exists() # $1 = chain name { qt $IPTABLES -L $1 -n } # # Create a mangle chain # # Create a variable exists_mangle_${1} and set its value to Yes to indicate that # the chain now exists. # createmanglechain() # $1 = chain name { run_iptables -t mangle -N $1 eval exists_mangle_${1}=Yes } # # Determine if a mangle chain exists # # When we create a chain "chain", we create a variable named exists_nat_chain # and set its value to Yes. This function tests for the "exists_" variable # corresponding to the passed chain having the value of "Yes". # havemanglechain() # $1 = name of chain { eval test \"\$exists_mangle_${1}\" = Yes } # # Ensure that a mangle chain exists (create it if it doesn't) # ensuremanglechain() # $1 = chain name { havemanglechain $1 || createmanglechain $1 } # # Create a nat chain # # Create a variable exists_nat_${1} and set its value to Yes to indicate that # the chain now exists. # createnatchain() # $1 = chain name { run_iptables -t nat -N $1 eval exists_nat_${1}=Yes } # # Determine if a nat chain exists # # When we create a chain "chain", we create a variable named exists_nat_chain # and set its value to Yes. This function tests for the "exists_" variable # corresponding to the passed chain having the value of "Yes". # havenatchain() # $1 = name of chain { eval test \"\$exists_nat_${1}\" = 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 $@ } # # Create a rule to delete a chain if it exists # deletechain() # $1 = name of chain { save_command "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 $1 } # # This function assumes that the TMP_DIR variable is set and that # its value names an existing directory. # determine_zones() { local zone parent parents rest new_zone_file= r merge_zone() { local z zones="$ZONES" merged= if [ -n "$parents" ]; then ZONES= for z in $zones; do if [ -z "$merged" ] && list_search $z $parents; then ZONES="$ZONES $zone" merged=Yes fi ZONES="$ZONES $z" done else ZONES="$ZONES $zone" fi } strip_file zones ZONES= IPV4_ZONES= IPSEC_ZONES= [ "$IPSECFILE" = zones ] && new_zone_file=Yes || test -n "${FW:=fw}" while read zone type rest; do expandv zone type case $zone in *:*) parents=${zone#*:} zone=${zone%:*} [ -n "$zone" ] || fatal_error "Invalid nested zone syntax: :$parents" parents=$(separate_list $parents) eval ${zone}_parents=\"$parents\" ;; *) parents= eval ${zone}_parents= ;; esac for parent in $parents; do [ "$parent" = "$FW" ] && fatal_error "Sub-zones of the firewall zone are not allowed" list_search $parent $ZONES || fatal_error "Parent zone not defined: $parent" done [ ${#zone} -gt 5 ] && fatal_error "Zone name longer than 5 characters: $zone" case "$zone" in [0-9*]) fatal_error "Illegal zone name \"$zone\" in zones file" ;; all|none) fatal_error "Reserved zone name \"$zone\" in zones file" ;; esac if [ -n "$new_zone_file" ]; then case ${type:=ipv4} in ipv4|IPv4|IPV4|plain|-) list_search $zone $ZONES $FW && fatal_error "Zone $zone is defined more than once" merge_zone IPV4_ZONES="$IPV4_ZONES $zone" ;; ipsec|IPSEC|ipsec4|IPSEC4) list_search $zone $ZONES $FW && fatal_error "Zone $zone is defined more than once" [ -n "$POLICY_MATCH" ] || fatal_error "Your kernel and/or iptables does not support policy match" eval ${zone}_is_ipsec=Yes eval ${zone}_is_complex=Yes merge_zone IPSEC_ZONES="$IPSEC_ZONES $zone" ;; firewall) [ -n "$FW" ] && fatal_error "Only one firewall zone may be defined" list_search $zone $ZONES && fatal_error "Zone $zone is defined more than once" [ -n "$parents" ] && fatal_error "The firewall zone may not be nested" for r in $rest; do [ "x$r" = x- ] || fatal_error "OPTIONS not allowed on the firewall zone" done FW=$zone ;; *) fatal_error "Invalid Zone Type: $type" ;; esac eval ${zone}_type=$type else list_search $zone $ZONES $FW && fatal_error "Zone $zone is defined more than once" ZONES="$ZONES $zone" IPV4_ZONES="$IPV4_ZONES $zone" eval ${zone}_type=ipv4 fi done < $TMP_DIR/zones [ -z "$ZONES" ] && fatal_error "No ipv4 or ipsec Zones Defined" [ -z "$FW" ] && fatal_error "No Firewall Zone Defined" } # # 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 } macrecent_target() # $1 - interface { [ -n "$MACLIST_TTL" ] && echo $(chain_base $1)_rec || echo RETURN } # # DNAT Chain from a zone # dnat_chain() # $1 = zone { echo ${1}_dnat } # # SNAT Chain to an interface # snat_chain() # $1 = interface { echo $(chain_base $1)_snat } # # ECN Chain to an interface # ecn_chain() # $1 = interface { echo $(chain_base $1)_ecn } # # First chains for an interface # first_chains() #$1 = interface { local c=$(chain_base $1) echo ${c}_fwd ${c}_in } # # Horrible hack to work around an iptables limitation # iprange_echo() { if [ -n "$KLUDGEFREE" ]; then echo "-m iprange $@" elif [ -f $TMP_DIR/iprange ]; then echo $@ else echo "-m iprange $@" > $TMP_DIR/iprange fi } # # Get set flags (ipsets). # get_set_flags() # $1 = set name and optional [levels], $2 = src or dst { local temp setname=$1 options=$2 [ -n "$IPSET_MATCH" ] || fatal_error "Your kernel and/or iptables does not include ipset match: $1" case $1 in *\[[1-6]\]) temp=${1#*\[} temp=${temp%\]} setname=${1%\[*} while [ $temp -gt 1 ]; do options="$options,$2" temp=$(($temp - 1)) done ;; *\[*\]) options=${1#*\[} options=${options%\]} setname=${1%\[*} ;; *) ;; esac echo "--set ${setname#+} $options" } # # Horrible hack to work around an iptables limitation # physdev_echo() { if [ -n "$KLUDGEFREE" ]; then echo -m physdev $@ elif [ -f $TMP_DIR/physdev ]; then echo $@ else echo -m physdev $@ > $TMP_DIR/physdev fi } # # We allow hosts to be specified by IP address or by physdev. These two functions # are used to produce the proper match in a netfilter rule. # match_source_hosts() { if [ -n "$BRIDGING" ]; then case $1 in *:*) physdev_echo "--physdev-in ${1%:*} $(source_ip_range ${1#*:})" ;; *.*.*.*|+*|!+*) echo $(source_ip_range $1) ;; *) physdev_echo "--physdev-in $1" ;; esac else echo $(source_ip_range $1) fi } match_dest_hosts() { if [ -n "$BRIDGING" ]; then case $1 in *:*) physdev_echo "--physdev-out ${1%:*} $(dest_ip_range ${1#*:})" ;; *.*.*.*|+*|!+*) echo $(dest_ip_range $1) ;; *) physdev_echo "--physdev-out $1" ;; esac else echo $(dest_ip_range $1) fi } # # Similarly, the source or destination in a rule can be qualified by a device name. If # the device is defined in ${CONFDIR}/interfaces then a normal interface match is # generated (-i or -o); otherwise, a physdev match is generated. #------------------------------------------------------------------------------------- # # loosely match the passed interface with those in ${CONFDIR}/interfaces. # known_interface() # $1 = interface name { local iface for iface in $ALL_INTERFACES ; do if if_match $iface $1 ; then return 0 fi done return 1 } known_port() # $1 = port name { local port for port in $ALL_PORTS ; do if if_match $port $1 ; then return 0 fi done return 1 } match_source_dev() { if [ -n "$BRIDGING" ]; then known_port $1 && physdev_echo "--physdev-in $1" || echo -i $1 elif known_interface $1; then echo -i $1 elif [ -n "$PHYSDEV_MATCH" ]; then physdev_echo "--physdev-in $1" else echo -i $1 fi } match_dest_dev() { if [ -n "$BRIDGING" ]; then known_port $1 && physdev_echo "--physdev-out $1" || echo -o $1 elif known_interface $1; then echo -o $1 elif [ -n "$PHYSDEV_MATCH" ]; then physdev_echo "--physdev-out $1" else echo -o $1 fi } verify_interface() { known_interface $1 || { [ -n "$BRIDGING" ] && known_port $1 ; } } # # Determine if communication to/from a host is encrypted using IPSEC # is_ipsec_host() # $1 = zone, $2 = host { eval local is_ipsec=\$${1}_is_ipsec eval local hosts=\"\$${1}_ipsec_hosts\" test -n "$is_ipsec" || list_search $2 $hosts } # # Generate a match for decrypted packets # match_ipsec_in() # $1 = zone, $2 = host { if is_ipsec_host $1 $2 ; then eval local options=\"\$${1}_ipsec_options \$${1}_ipsec_in_options\" echo "-m policy --pol ipsec --dir in $options" elif [ -n "$POLICY_MATCH" ]; then echo "-m policy --pol none --dir in" fi } # # Generate a match for packets that will be encrypted # match_ipsec_out() # $1 = zone, $2 = host { if is_ipsec_host $1 $2 ; then eval local options=\"\$${1}_ipsec_options \$${1}_ipsec_out_options\" echo "-m policy --pol ipsec --dir out $options" elif [ -n "$POLICY_MATCH" ]; then echo "-m policy --pol none --dir out" fi } # # Jacket for ip_range() that takes care of iprange match # firewall_ip_range() # $1 = IP address or range { [ -n "$IPRANGE_MATCH" ] && echo $1 || ip_range $1 } # # # 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() # $1 = host zone { local hosts interface address addresses while read z hosts options; do if [ "x$(expand $z)" = "x$1" ]; then expandv hosts interface=${hosts%%:*} addresses=${hosts#*:} for address in $(separate_list $addresses); do echo $interface:$address done fi 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 if an interface has a given option # interface_has_option() # $1 = interface, #2 = option { local options eval options=\$$(chain_base $1)_options list_search $2 $options } # # Determine the defined hosts in each zone # 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 interface_has_option $interface detectnets; then networks=$(get_routed_networks $interface) else networks=0.0.0.0/0 fi for network in $networks; do if [ -z "$hosts" ]; then hosts=$interface:$network else hosts="$hosts $interface:$network" fi if interface_has_option $interface routeback; then eval ${zone}_routeback=\"$interface:$network \$${zone}_routeback\" fi done done interfaces= for host in $hosts; do interface=${host%:*} if list_search $interface $interfaces; then list_search $interface:0.0.0.0/0 $hosts && \ fatal_error "Invalid zone definition for zone $zone" list_search $interface:0/0 $hosts && \ fatal_error "Invalid zone definition for zone $zone" eval ${zone}_is_complex=Yes else if [ -z "$interfaces" ]; then interfaces=$interface else interfaces="$interfaces $interface" fi fi done eval ${zone}_interfaces="\$interfaces" eval ${zone}_hosts="\$hosts" if [ -n "$hosts" ]; then [ $VERBOSE -ge 1 ] && display_list "$zone 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 } # # Ensure that the passed zone is defined in the zones file. # validate_zone1() # $1 = zone { list_search $1 $ZONES } # # Validate the zone names and options in the interfaces file # validate_interfaces_file() { local wildcard local found_obsolete_option= local z interface networks options r iface option while read z interface networks options; do expandv z interface networks options r="$z $interface $networks $options" [ "x$z" = "x-" ] && z= if [ -n "$z" ]; then validate_zone $z || fatal_error "Invalid zone ($z) in record \"$r\"" fi list_search $interface $ALL_INTERFACES && \ fatal_error "Duplicate Interface $interface" wildcard= case $interface in *:*|+) fatal_error "Invalid Interface Name: $interface" ;; *+) wildcard=Yes ;; esac ALL_INTERFACES="$ALL_INTERFACES $interface" options=$(separate_list $options) iface=$(chain_base $interface) eval ${iface}_broadcast="$networks" eval ${iface}_zone="$z" eval ${iface}_options=\"$options\" for option in $options; do case $option in -) ;; dhcp|tcpflags|arp_filter|routefilter|maclist|logmartians|sourceroute|blacklist|proxyarp|nosmurfs|upnp|-) ;; norfc1918) indent >&3 << __EOF__ addr=\$(ip -f inet addr show $interface 2> /dev/null | grep 'inet\ ' | head -n1) if [ -n "\$addr" ]; then addr=\$(echo \$addr | sed 's/inet //;s/\/.*//;s/ peer.*//') for network in 10.0.0.0/8 176.16.0.0/12 192.168.0.0/16; do if in_network \$addr \$network; then startup_error "The 'norfc1918' option has been specified on an interface with an RFC 1918 address. Interface:$interface" fi done fi __EOF__ ;; arp_ignore=*) eval ${iface}_arp_ignore=${option#*=} ;; arp_ignore) eval ${iface}_arp_ignore=1 ;; detectnets) [ -n "$wildcard" ] && \ fatal_error "The \"detectnets\" option may not be used with a wild-card interface" [ -n "$EXPORT" ] && \ fatal_error "'detectnets' not permitted with the -e run-line option" ;; routeback) [ -n "$z" ] || fatal_error "The routeback option may not be specified on a multi-zone interface" ;; *) error_message "WARNING: Invalid option ($option) in record \"$r\"" ;; esac done done < $TMP_DIR/interfaces [ -z "$ALL_INTERFACES" ] && fatal_error "No Interfaces Defined" } # # Process the providers file # setup_providers() { local table number mark duplicate interface gateway options provider address copy route loose addresses rulenum rulebase echobin=$(mywhich echo) balance save_indent="$INDENT" mask= first=Yes copy_table() { indent >&3 << __EOF__ ip route show table $duplicate | while read net route; do case \$net in default|nexthop) ;; *) run_ip route add table $number \$net \$route ;; esac done __EOF__ } copy_and_edit_table() { indent >&3 << __EOF__ ip route show table $duplicate | while read net route; do case \$net in default|nexthop) ;; *) case \$(find_device \$route) in `echo $copy\) | sed 's/ /|/g'` run_ip route add table $number \$net \$route ;; esac ;; esac done __EOF__ } balance_default_route() # $1 = weight { balance=yes if [ -n "$first" ]; then if [ -n "$gateway" ] ; then save_command "DEFAULT_ROUTE=\"nexthop via $gateway dev $interface weight $1\"" else save_command "DEFAULT_ROUTE=\"nexthop dev $interface weight $1\"" fi first= else if [ -n "$gateway" ] ; then save_command "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop via $gateway dev $interface weight $1\"" else save_command "DEFAULT_ROUTE=\"\$DEFAULT_ROUTE nexthop dev $interface weight $1\"" fi fi } add_a_provider() { local t n iface option [ -n "$MANGLE_ENABLED" ] || fatal_error "Providers require mangle support in your kernel and iptables" for t in $PROVIDERS local main default unspec; do if [ "$t" = "$table" ]; then fatal_error "Duplicate Provider: $table, provider: \"$provider\"" fi eval n=\$${t}_number # # The following is because the %$#@ shell doesn't accept hex numbers in '-eq' tests # if [ $(($n)) -eq $(($number)) ]; then fatal_error "Duplicate Provider number: $number, provider: \"$provider\"" fi done eval ${table}_number=$number indent >&3 << __EOF__ # # Add Provider $table ($number) # __EOF__ save_command "qt ip route flush table $number" if [ "x${duplicate:=-}" != x- ]; then if [ "x${copy:=-}" != "x-" ]; then if [ "x${copy}" = xnone ]; then copy=$interface else copy="$interface $(separate_list $copy)" fi copy_and_edit_table else copy_table fi fi if [ "x$gateway" = xdetect ] ; then gateway='$gateway' indent >&3 << __EOF__ gateway=\$(detect_gateway $interface) if [ -n "\$gateway" ]; then run_ip route replace \$gateway src \$(find_first_interface_address $interface) dev $interface table $number run_ip route add default via \$gateway dev $interface table $number else fatal_error "Unable to detect the gateway through interface $interface" fi __EOF__ elif [ "x$gateway" != "x-" -a -n "$gateway" ]; then indent >&3 << __EOF__ run_ip route replace $gateway src \$(find_first_interface_address $interface) dev $interface table $number run_ip route add default via $gateway dev $interface table $number __EOF__ else gateway= save_command "run_ip route add default dev $interface table $number" fi if [ x${mark} != x- ]; then verify_mark $mark if [ $(($mark)) -lt 256 ]; then if [ -n "$HIGH_ROUTE_MARKS" ]; then fatal_error "Invalid Mark Value ($mark) with HIGH_ROUTE_MARKS=Yes" fi elif [ -z "$HIGH_ROUTE_MARKS" ]; then fatal_error "Invalid Mark Value ($mark) with HIGH_ROUTE_MARKS=No" fi eval ${table}_mark=$mark save_command "qt ip rule del fwmark $mark" save_command "run_ip rule add fwmark $mark pref $((10000 + $mark)) table $number" fi loose= for option in $(separate_list $options); do case $option in -) ;; track) list_search $interface $ROUTEMARK_INTERFACES && \ fatal_error "Interface $interface is tracked through an earlier provider" iface=$(chain_base $interface) [ x${mark} = x- ] && fatal_error "The 'track' option requires a numeric value in the MARK column - Provider \"$provider\"" eval ${iface}_routemark=$mark ROUTEMARK_INTERFACES="$ROUTEMARK_INTERFACES $interface" ;; balance=*) balance_default_route ${option#*=} ;; balance) balance_default_route 1 ;; loose) loose=Yes ;; *) error_message "WARNING: Invalid option ($option) ignored in provider \"$provider\"" ;; esac done rulenum=0 if [ -z "$loose" ]; then rulebase=$(( 20000 + ( 256 * ($number-1) ) )) indent >&3 << __EOF__ rulenum=0 find_interface_addresses $interface | while read address; do qt ip rule del from \$address run_ip rule add from \$address pref \$(( $rulebase + \$rulenum )) table $number rulenum=\$((\$rulenum + 1)) done __EOF__ else indent >&3 << __EOF__ find_interface_addresses $interface | while read address; do qt ip rule del from \$address done __EOF__ fi indent >&3 << __EOF__ progress_message " Provider $table ($number) Added" __EOF__ } verify_provider() { local p n for p in $PROVIDERS main; do [ "$p" = "$1" ] && return 0 eval n=\$${p}_number} [ "$n" = "$1" ] && return 0 done fatal_error "Unknown provider $1 in route rule \"$rule\"" } add_an_rtrule() { verify_provider $provider [ "x$source" = x- ] && source= [ "x$dest" = x- ] && dest= || dest="to $dest" [ -n "${source}${dest}" ] || fatal_error "You must specify either the source or destination in an rt rule: \"$rule\"" [ -n "$source" ] && case $source in *:*) source="iif ${source%:*} from ${source#*:}" ;; *.*.*) source="from $source" ;; *) source="iif $source" ;; esac case "$priority" in [0-9][0-9][0-9][0-9]|[0-9][0-9][0-9][0-9][0-9]) ;; *) fatal_error "Invalid priority ($priority) in rule \"$rule\"" ;; esac priority="priority $priority" save_command "qt ip rule del $source $dest $priority" save_command "run_ip rule add $source $dest $priority table $provider" progress_message "Routing rule \"$rule\" $DONE" } local_number=255 main_number=254 default_number=253 unspec_number=0 strip_file providers $1 if [ -s $TMP_DIR/providers ]; then DEFAULT_ROUTE= balance= progress_message2 "$DOING $1..." save_command save_command "if [ -z \"\$NOROUTES\" ]; then" INDENT="$INDENT " save_progress_message "Adding Providers..." save_command "DEFAULT_ROUTE=" while read table number mark duplicate interface gateway options copy; do expandv table number mark duplicate interface gateway options copy provider="$table $number $mark $duplicate $interface $gateway $options $copy" add_a_provider PROVIDERS="$PROVIDERS $table" progress_message "Provider $provider $DONE" done < $TMP_DIR/providers if [ -n "$PROVIDERS" ]; then if [ -n "$balance" ]; then save_command "run_ip route replace default scope global \$DEFAULT_ROUTE" save_command "progress_message Default route \$DEFAULT_ROUTE Added" fi cat >&3 << __EOF__ ${INDENT}cat > /etc/iproute2/rt_tables <&3 << __EOF__ \${echobin:-echo} -e "$number\t$table" >> /etc/iproute2/rt_tables __EOF__ done f=$(find_file route_rules) if [ -f $f ]; then strip_file route_rules $f if [ -s $TMP_DIR/route_rules ]; then progress_message2 "$DOING $f..." save_command while read source dest provider priority; do expandv source dest provider priority rule="$source $dest $priority $provider" add_an_rtrule done < $TMP_DIR/route_rules fi fi fi save_command "run_ip route flush cache" INDENT="$save_indent" save_command "fi" save_command fi } # # Validate the zone names and options in the hosts file # validate_hosts_file() { local z hosts options r interface host option zports check_bridge_port() { list_search ${interface}:${1} $zports || zports="$zports ${interface}:${1}" list_search $1 $ALL_PORTS || ALL_PORTS="$ALL_PORTS $1" } while read z hosts options; do expandv z hosts options r="$z $hosts $options" validate_zone1 $z || fatal_error "Invalid zone ($z) in record \"$r\"" case $hosts in *:*) interface=${hosts%%:*} iface=$(chain_base $interface) list_search $interface $ALL_INTERFACES || \ fatal_error "Unknown interface ($interface) in record \"$r\"" hosts=${hosts#*:} ;; *) fatal_error "Invalid HOST(S) column contents: $hosts" ;; esac eval zports=\$${z}_ports for host in $(separate_list $hosts); do if [ -n "$BRIDGING" ]; then case $host in *:*) known_interface ${host%:*} && \ fatal_error "Bridged interfaces may not be defined in ${CONFDIR}/interfaces: $host" check_bridge_port ${host%%:*} ;; *.*.*) ;; *+|+*) eval ${z}_is_complex=Yes ;; *) known_interface $host && \ fatal_error "Bridged interfaces may not be defined in ${CONFDIR}/interfaces: $host" check_bridge_port $host ;; esac else case $host in *.*.*) ;; *+) eval ${z}_is_complex=Yes ;; *) fatal_error "BRIDGING=Yes is needed for this zone definition: $r" ;; esac fi for option in $(separate_list $options) ; do case $option in norfc1918|blacklist|maclist|tcpflags|nosmurfs|-) ;; ipsec) [ -n "$POLICY_MATCH" ] || \ fatal_error "Your kernel and/or iptables does not support policy match: ipsec" eval ${z}_ipsec_hosts=\"\$${z}_ipsec_hosts $interface:$host\" eval ${z}_is_complex=Yes ;; routeback) eval ${z}_routeback=\"$interface:$host \$${z}_routeback\" ;; *) error_message "WARNING: Invalid option ($option) in record \"$r\"" ;; esac done done [ -n "$zports" ] && eval ${z}_ports=\"$zports\" done < $TMP_DIR/hosts [ -n "$ALL_PORTS" ] && progress_message2 " Bridge ports are: $ALL_PORTS" } # # 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 local parents print_policy() # $1 = source zone, $2 = destination zone { [ $1 = $2 ] || \ [ $1 = all ] || \ [ $2 = all ] || \ progress_message " Policy for $1 to $2 is $policy using chain $chain" } ALL_POLICY_CHAINS= for zone in $ZONES $FW; do chain=${zone}2${zone} eval ${chain}_is_policy=Yes eval ${chain}_is_optional=Yes eval ${chain}_policy=ACCEPT eval ${chain}_policychain=$chain ALL_POLICY_CHAINS="$ALL_POLICY_CHAINS $chain" if [ -n "$IMPLICIT_CONTINUE" ]; then eval parents=\$${zone}_parents if [ -n "$parents" ]; then for zone1 in $ZONES $FW; do chain=${zone}2${zone1} eval ${chain}_is_policy=Yes eval ${chain}_is_optional=Yes eval ${chain}_policy=CONTINUE eval ${chain}_policychain=$chain ALL_POLICY_CHAINS="$ALL_POLICY_CHAINS $chain" chain=${zone1}2${zone} eval ${chain}_is_policy=Yes eval ${chain}_is_optional=Yes eval ${chain}_policy=CONTINUE eval ${chain}_policychain=$chain ALL_POLICY_CHAINS="$ALL_POLICY_CHAINS $chain" done fi fi done strip_file policy while read client server policy loglevel synparams; do expandv client server policy loglevel synparams clientwild= serverwild= case "$client" in all|ALL) clientwild=Yes ;; *) if ! validate_zone $client; then fatal_error "Undefined zone $client" fi esac case "$server" in all|ALL) serverwild=Yes ;; *) if ! validate_zone $server; then fatal_error "Undefined zone $server" fi esac case $policy in ACCEPT|REJECT|DROP|CONTINUE|QUEUE) ;; NONE) [ "$client" = "$FW" -o "$server" = "$FW" ] && \ fatal_error " $client $server $policy $loglevel $synparams: NONE policy not allowed to/from the $FW zone" [ -n "$clientwild" -o -n "$serverwild" ] && \ fatal_error " $client $server $policy $loglevel $synparams: NONE policy not allowed with \"all\"" ;; *) fatal_error "Invalid policy $policy" ;; esac chain=${client}2${server} if is_policy_chain $chain ; then if eval test -n \"\$${chain}_is_optional\" ; then eval ${chain}_is_optional= else fatal_error "Duplicate policy: $client $server $policy" fi fi [ "x$loglevel" = "x-" ] && loglevel= [ "x$synparams" = "x-" ] && synparams= [ $policy = NONE ] || ALL_POLICY_CHAINS="$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 -- if we are compiling a script and 'detect' is specified for an interface # the function returns nothing for that interface # find_broadcasts() { for interface in $ALL_INTERFACES; do eval bcast=\$$(chain_base $interface)_broadcast if [ "x$bcast" != "xdetect" -a "x${bcast}" != "x-" ]; then echo $(separate_list $bcast) fi done } # # Find interfaces with BROADCAST=detect -- Only returns information if we are compiling a script # find_bcastdetect_interfaces() { for interface in $ALL_INTERFACES; do eval bcast=\$$(chain_base $interface)_broadcast [ "x$bcast" = "xdetect" ] && echo $interface done } # # 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 } # # This slightly slower version is used to find both the option and option followed # by equal sign ("=") and a value # find_interfaces_by_option1() # $1 = option { local options option for interface in $ALL_INTERFACES; do eval options=\$$(chain_base $interface)_options for option in $options; do if [ "${option%=*}" = "$1" ]; then echo $interface break fi done done } # # Find hosts with the passed option # find_hosts_by_option() # $1 = option { local ignore hosts interface address addresses options ipsec= list while read ignore hosts options; do expandv options list=$(separate_list $options) if list_search $1 $list; then list_search ipsec $list && ipsec=ipsec || ipsec=none expandv hosts interface=${hosts%%:*} addresses=${hosts#*:} for address in $(separate_list $addresses); do echo ${ipsec}^$interface:$address done fi done < $TMP_DIR/hosts for interface in $ALL_INTERFACES; do interface_has_option $interface $1 && \ echo none^${interface}:0.0.0.0/0 done } # # Flush and delete all user-defined chains in the filter table # deleteallchains() { run_iptables -F run_iptables -X } # # Set /proc/sys/net/ipv4/ip_forward based on $IP_FORWARDING # setup_forwarding() { progress_message2 "Compiling IP Forwarding..." case "$IP_FORWARDING" in [Oo][Nn]) save_progress_message "IP Forwarding Enabled" save_command "echo 1 > /proc/sys/net/ipv4/ip_forward" ;; [Oo][Ff][Ff]) save_progress_message "IP Forwarding Disabled!" save_command "echo 0 > /proc/sys/net/ipv4/ip_forward" ;; esac } # # Process the routestopped file either adding or deleting rules # process_routestopped() # $1 = command { local hosts= interface host host1 options networks source= dest= matched while read interface host options; do expandv interface host options [ "x$host" = "x-" -o -z "$host" ] && host=0.0.0.0/0 for h in $(separate_list $host); do hosts="$hosts $interface:$h" done routeback= if [ -n "$options" ]; then for option in $(separate_list $options); do case $option in routeback) if [ -n "$routeback" ]; then error_message "WARNING: Duplicate routestopped option ignored: routeback" else routeback=Yes for h in $(separate_list $host); do run_iptables $1 FORWARD -i $interface -o $interface $(both_ip_ranges $h $h) -j ACCEPT done fi ;; source) for h in $(separate_list $host); do source="$source $interface:$h" done ;; dest) for h in $(separate_list $host); do dest="$dest $interface:$h" done ;; critical) ;; *) error_message "WARNING: Unknown routestopped option ignored: $option" ;; esac done fi done < $TMP_DIR/routestopped for host in $hosts; do interface=${host%:*} networks=${host#*:} source_range=$(source_ip_range $networks) dest_range=$(dest_ip_range $networks) run_iptables $1 INPUT -i $interface $source_range -j ACCEPT [ -z "$ADMINISABSENTMINDED" ] && \ run_iptables $1 OUTPUT -o $interface $dest_range -j ACCEPT matched= if list_search $host $source ; then run_iptables $1 FORWARD -i $interface $source_range -j ACCEPT matched=Yes fi if list_search $host $dest ; then run_iptables $1 FORWARD -o $interface $dest_range -j ACCEPT matched=Yes fi if [ -z "$matched" ]; then for host1 in $hosts; do [ "$host" != "$host1" ] && run_iptables $1 FORWARD -i $interface -o ${host1%:*} $(both_ip_ranges $networks ${host1#*:}) -j ACCEPT done fi done } process_criticalhosts() { local hosts= interface host h options networks criticalhosts= [ -f $TMP_DIR/routestopped ] || strip_file routestopped while read interface host options; do expandv interface host options [ "x$host" = "x-" -o -z "$host" ] && host=0.0.0.0/0 || host=$(separate_list $host) if [ -n "$options" ]; then for option in $(separate_list $options); do case $option in routeback|source|dest) ;; critical) for h in $host; do criticalhosts="$criticalhosts $interface:$h" done ;; *) error_message "WARNING: Unknown routestopped option ignored: $option" ;; esac done fi done < $TMP_DIR/routestopped if [ -n "$criticalhosts" ]; then CRITICALHOSTS=$criticalhosts progress_message "Critical Hosts are:$CRITICALHOSTS" fi } # # For each entry in the CRITICALHOSTS global list, add INPUT and OUTPUT rules to # enable traffic to/from those hosts. # enable_critical_hosts() { for host in $CRITICALHOSTS; do interface=${host%:*} networks=${host#*:} do_iptables -A INPUT -i $interface $(source_ip_range $networks) -j ACCEPT do_iptables -A OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT done } # # For each entry in the CRITICALHOSTS global list, delete the INPUT and OUTPUT rules that # enable traffic to/from those hosts. # disable_critical_hosts() { for host in $CRITICALHOSTS; do interface=${host%:*} networks=${host#*:} do_iptables -D INPUT -i $interface $(source_ip_range $networks) -j ACCEPT do_iptables -D OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT done } # # Set up ipsec tunnels # setup_tunnels() # $1 = name of tunnels file { local inchain local outchain local source local dest setup_one_ipsec() # $1 = Tunnel Kind $2 = gateway zones { local kind=$1 noah= case $kind in *:*) noah=${kind#*:} [ $noah = noah -o $noah = NOAH ] || fatal_error "Invalid IPSEC modifier $noah in tunnel \"$tunnel\"" kind=${kind%:*} ;; esac [ $kind = IPSEC ] && kind=ipsec options="-m state --state NEW -j ACCEPT" addrule2 $inchain -p 50 $source -j ACCEPT addrule2 $outchain -p 50 $dest -j ACCEPT if [ -z "$noah" ]; then run_iptables -A $inchain -p 51 $source -j ACCEPT run_iptables -A $outchain -p 51 $dest -j ACCEPT fi run_iptables -A $outchain -p udp $dest --dport 500 $options if [ $kind = ipsec ]; then run_iptables -A $inchain -p udp $source --dport 500 $options else run_iptables -A $inchain -p udp $source --dport 500 $options run_iptables -A $inchain -p udp $source --dport 4500 $options fi for z in $(separate_list $2); do if validate_zone $z; then if [ -z "$POLICY_MATCH" ]; then addrule ${z}2${FW} -p 50 $source -j ACCEPT addrule ${FW}2${z} -p 50 $dest -j ACCEPT if [ -z "$noah" ]; then addrule ${z}2${FW} -p 51 $source -j ACCEPT addrule ${FW}2${z} -p 51 $dest -j ACCEPT fi fi if [ $kind = ipsec ]; then addrule ${z}2${FW} -p udp $source --dport 500 $options addrule ${FW}2${z} -p udp $dest --dport 500 $options else addrule ${z}2${FW} -p udp $source --dport 500 $options addrule ${FW}2${z} -p udp $dest --dport 500 $options addrule ${z}2${FW} -p udp $source --dport 4500 $options addrule ${FW}2${z} -p udp $dest --dport 4500 $options fi else fatal_error "Invalid gateway zone ($z) -- Tunnel \"$tunnel\"" fi done progress_message_and_save " IPSEC tunnel to $gateway defined." } setup_one_other() # $1 = TYPE, $2 = protocol { addrule2 $inchain -p $2 $source -j ACCEPT addrule2 $outchain -p $2 $dest -j ACCEPT progress_message_and_save " $1 tunnel to $gateway compiled." } setup_pptp_client() { addrule2 $outchain -p 47 $dest -j ACCEPT addrule2 $inchain -p 47 $source -j ACCEPT addrule2 $outchain -p tcp --dport 1723 $dest -j ACCEPT progress_message_and_save " PPTP tunnel to $gateway defined." } setup_pptp_server() { addrule2 $inchain -p 47 $source -j ACCEPT addrule2 $outchain -p 47 $dest -j ACCEPT addrule2 $inchain -p tcp --dport 1723 $source -j ACCEPT progress_message_and_save " PPTP server defined." } setup_one_openvpn() # $1 = kind[:port] { local protocol=udp local p=1194 case $1 in *:*:*) protocol=${1%:*} protocol=${protocol#*:} p=${1##*:} ;; *:tcp|*:udp|*:TCP|*:UDP) protocol=${1#*:} ;; *:*) p=${1#*:} ;; esac addrule2 $inchain -p $protocol $source --dport $p -j ACCEPT addrule2 $outchain -p $protocol $dest --dport $p -j ACCEPT progress_message_and_save " OPENVPN tunnel to $gateway:$protocol:$p defined." } setup_one_openvpn_server() # $1 = kind[:port] { local protocol=udp local p=1194 case $1 in *:*:*) protocol=${1%:*} protocol=${protocol#*:} p=${1##*:} ;; *:tcp|*:udp|*:TCP|*:UDP) protocol=${1#*:} ;; *:*) p=${1#*:} ;; esac addrule2 $inchain -p $protocol $source --dport $p -j ACCEPT addrule2 $outchain -p $protocol $dest --sport $p -j ACCEPT progress_message_and_save " OPENVPN server tunnel from $gateway:$protocol:$p defined." } setup_one_openvpn_client() # $1 = kind[:port] { local protocol=udp local p=1194 case $1 in *:*:*) protocol=${1%:*} protocol=${protocol#*:} p=${1##*:} ;; *:tcp|*:udp|*:TCP|*:UDP) protocol=${1#*:} ;; *:*) p=${1#*:} ;; esac addrule2 $inchain -p $protocol $source --sport $p -j ACCEPT addrule2 $outchain -p $protocol $dest --dport $p -j ACCEPT progress_message_and_save " OPENVPN client tunnel to $gateway:$protocol:$p defined." } setup_one_generic() # $1 = kind:protocol[:port] { local protocol local p= case $1 in *:*:*) p=${1##*:} protocol=${1%:*} protocol=${protocol#*:} ;; *:*) protocol=${1#*:} ;; *) protocol=udp p=5000 ;; esac p=${p:+--dport $p} addrule2 $inchain -p $protocol $source $p -j ACCEPT addrule2 $outchain -p $protocol $dest $p -j ACCEPT progress_message_and_save " GENERIC 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${z} gateway=${gateway:-0.0.0.0/0} source=$(source_ip_range $gateway) dest=$(dest_ip_range $gateway) case $kind in ipsec|IPSEC|ipsec:*|IPSEC:*) setup_one_ipsec $kind $z1 ;; ipsecnat|IPSECNAT|ipsecnat:*|IPSECNAT:*) setup_one_ipsec $kind $z1 ;; ipip|IPIP) setup_one_other IPIP 4 ;; gre|GRE) setup_one_other GRE 47 ;; 6to4|6TO4) setup_one_other 6to4 41 ;; pptpclient|PPTPCLIENT) setup_pptp_client ;; pptpserver|PPTPSERVER) setup_pptp_server ;; openvpn|OPENVPN|openvpn:*|OPENVPN:*) setup_one_openvpn $kind ;; openvpnclient|OPENVPNCLIENT|openvpnclient:*|OPENVPNCLIENT:*) setup_one_openvpn_client $kind ;; openvpnserver|OPENVPNSERVER|openvpnserver:*|OPENVPNSERVER:*) setup_one_openvpn_server $kind ;; generic:*|GENERIC:*) setup_one_generic $kind ;; *) error_message "WARNING: Tunnels of type $kind are not supported:" \ "Tunnel \"$tunnel\" Ignored" ;; esac else error_message "ERROR: Invalid gateway zone ($z)" \ " -- Tunnel \"$tunnel\" Ignored" fi done < $TMP_DIR/tunnels } # # Process the ipsec information in the zones file # setup_ipsec() { local zone using_ipsec= # # Add a --set-mss rule to the passed chain # set_mss1() # $1 = chain, $2 = MSS { eval local policy=\$${1}_policy if [ "$policy" != NONE ]; then ensurechain $1 run_iptables -I $1 -p tcp --tcp-flags SYN,RST SYN -j TCPMSS --set-mss $2 fi } # # Set up rules to set MSS to and/or from zone "$zone" # set_mss() # $1 = MSS value, $2 = _in, _out or "" { for z in $ZONES; do case $2 in _in) set_mss1 ${zone}2${z} $1 ;; _out) set_mss1 ${z}2${zone} $1 ;; *) set_mss1 ${z}2${zone} $1 set_mss1 ${zone}2${z} $1 ;; esac done } do_options() # $1 = _in, _out or "" - $2 = option list { local option opts newoptions= val [ x${2} = x- ] && return opts=$(separate_list $2) for option in $opts; do val=${option#*=} case $option in mss=[0-9]*) set_mss $val $1 ;; strict) newoptions="$newoptions --strict" ;; next) newoptions="$newoptions --next" ;; reqid=*) newoptions="$newoptions --reqid $val" ;; spi=*) newoptions="$newoptions --spi $val" ;; proto=*) newoptions="$newoptions --proto $val" ;; mode=*) newoptions="$newoptions --mode $val" ;; tunnel-src=*) newoptions="$newoptions --tunnel-src $val" ;; tunnel-dst=*) newoptions="$newoptions --tunnel-dst $val" ;; reqid!=*) newoptions="$newoptions ! --reqid $val" ;; spi!=*) newoptions="$newoptions ! --spi $val" ;; proto!=*) newoptions="$newoptions ! --proto $val" ;; mode!=*) newoptions="$newoptions ! --mode $val" ;; tunnel-src!=*) newoptions="$newoptions ! --tunnel-src $val" ;; tunnel-dst!=*) newoptions="$newoptions ! --tunnel-dst $val" ;; *) fatal_error "Invalid option \"$option\" for zone $zone" ;; esac done if [ -n "$newoptions" ]; then [ -n "$POLICY_MATCH" ] || fatal_error "Your kernel and/or iptables does not support policy match" eval ${zone}_is_complex=Yes eval ${zone}_ipsec${1}_options=\"${newoptions# }\" fi } case $IPSECFILE in zones) f=zones progress_message2 "$DOING IPSEC..." ;; *) f=$IPSECFILE strip_file $f progress_message2 "$DOING $f..." using_ipsec=Yes ;; esac while read zone type options in_options out_options mss; do expandv zone type options in_options out_options mss if [ -n "$using_ipsec" ]; then validate_zone1 $zone || fatal_error "Unknown zone: $zone" fi if [ -n "$type" ]; then if [ -n "$using_ipsec" ]; then case $type in No|no) ;; Yes|yes) [ -n "$POLICY_MATCH" ] || fatal_error "Your kernel and/or iptables does not support policy match" eval ${zone}_is_ipsec=Yes eval ${zone}_is_complex=Yes eval ${zone}_type=ipsec4 ;; *) fatal_error "Invalid IPSEC column contents" ;; esac fi do_options "" $options do_options "_in" $in_options do_options "_out" $out_options fi done < $TMP_DIR/$f } ## # Setup Proxy ARP # setup_proxy_arp() { local setlist= resetlist= print_error() { error_message "Invalid value for HAVEROUTE - ($haveroute)" error_message "Entry \"$address $interface $external $haveroute\" ignored" } print_error1() { error_message "Invalid value for PERSISTENT - ($persistent)" error_message "Entry \"$address $interface $external $haveroute $persistent\" ignored" } print_warning() { error_message "PERSISTENT setting ignored - ($persistent)" error_message "Entry \"$address $interface $external $haveroute $persistent\"" } setup_one_proxy_arp() { case $haveroute in [Nn][Oo]) haveroute= ;; [Yy][Ee][Ss]) ;; *) if [ -n "$haveroute" ]; then print_error return fi ;; esac case $persistent in [Nn][Oo]) persistent= ;; [Yy][Ee][Ss]) [ -z "$haveroute" ] || print_warning ;; *) if [ -n "$persistent" ]; then print_error1 return fi ;; esac if [ -z "$haveroute" ]; then save_command "[ -n \"\$NOROUTES\" ] || run_ip route replace $address dev $interface" [ -n "$persistent" ] && haveroute=yes fi indent >&3 << __EOF__ if ! arp -i $external -Ds $address $external pub; then fatal_error "Command \"arp -i $external -Ds $address $external pub\" failed" fi progress_message " Host $address connected to $interface added to ARP on $external" __EOF__ echo $address $interface $external $haveroute >> $STATEDIR/proxyarp progress_message " Host $address connected to $interface added to ARP on $external" } > $STATEDIR/proxyarp save_progress_message "Setting up Proxy ARP..." while read address interface external haveroute persistent; do expandv address interface external haveroute persistent list_search $interface $setlist || setlist="$setlist $interface" list_search $external $resetlist || list_search $external $setlist || resetlist="$resetlist $external" setup_one_proxy_arp done < $TMP_DIR/proxyarp for interface in $resetlist; do list_search $interface $setlist || \ save_command "echo 0 > /proc/sys/net/ipv4/conf/$interface/proxy_arp" done for interface in $setlist; do save_command "echo 1 > /proc/sys/net/ipv4/conf/$interface/proxy_arp" done interfaces=$(find_interfaces_by_option proxyarp) for interface in $interfaces; do indent >&3 << __EOF__ if [ -f /proc/sys/net/ipv4/conf/$interface/proxy_arp ] ; then echo 1 > /proc/sys/net/ipv4/conf/$interface/proxy_arp else error_message "WARNING: Unable to enable proxy ARP on $interface" fi __EOF__ done } # # Set up MAC Verification # setup_mac_lists() { local interface local mac local addresses local address local chain local chain1 local macpart local blob local hosts local ipsec local policy= create_mac_chain() { case $MACLIST_TABLE in filter) createchain $1 no ;; *) createmanglechain $1 ;; esac } have_mac_chain() { local result case $MACLIST_TABLE in filter) havechain $1 && result=0 || result=1 ;; *) havemanglechain $1 && result=0 || result=1 ;; esac return $result } # # Generate the list of interfaces having MAC verification # maclist_interfaces= for hosts in $maclist_hosts; do hosts=${hosts#*^} interface=${hosts%%:*} if ! list_search $interface $maclist_interfaces; then\ if [ -z "$maclist_interfaces" ]; then maclist_interfaces=$interface else maclist_interfaces="$maclist_interfaces $interface" fi fi done progress_message "$DOING MAC Verification on $maclist_interfaces..." # # Create chains. # for interface in $maclist_interfaces; do chain=$(mac_chain $interface) create_mac_chain $chain # # If we're using the mangle table and the interface is DHCP-enabled then we need to accept DHCP broadcasts from 0.0.0.0 # if [ $MACLIST_TABLE = mangle ] && interface_has_option $interface dhcp; then run_iptables -t mangle -A $chain -s 0.0.0.0 -d 255.255.255.255 -p udp --dport 67:68 -j RETURN fi if [ -n "$MACLIST_TTL" ]; then chain1=$(macrecent_target $interface) create_mac_chain $chain1 run_iptables -A $chain -t $MACLIST_TABLE -m recent --rcheck --seconds $MACLIST_TTL --name $chain -j RETURN run_iptables -A $chain -t $MACLIST_TABLE -j $chain1 run_iptables -A $chain -t $MACLIST_TABLE -m recent --update --name $chain -j RETURN run_iptables -A $chain -t $MACLIST_TABLE -m recent --set --name $chain fi done # # Process the maclist file producing the verification rules # while read disposition interface mac addresses; do expandv disposition interface mac addresses level= case $disposition in ACCEPT:*) level=${disposition#*:} disposition=ACCEPT target=RETURN ;; ACCEPT) target=RETURN ;; REJECT:*) [ $MACLIST_TABLE = mangle ] && fatal_error "DISPOSITION = REJECT is incompatible with MACLIST_TABLE=mangle" target=reject disposition=REJECT ;; REJECT) [ $MACLIST_TABLE = mangle ] && fatal_error "DISPOSITION = REJECT is incompatible with MACLIST_TABLE=mangle" target=reject ;; DROP:*) level=${disposition#*:} disposition=DROP target=DROP ;; DROP) target=DROP ;; *) addresses="$mac" mac="$interface" interface="$disposition" disposition=ACCEPT target=RETURN ;; esac physdev_part= if [ -n "$BRIDGING" ]; then case $interface in *:*) physdev_part="-m physdev --physdev-in ${interface#*:}" interface=${interface%:*} ;; esac fi [ -n "$MACLIST_TTL" ] && chain=$(macrecent_target $interface) || chain=$(mac_chain $interface) if ! have_mac_chain $chain ; then fatal_error "No hosts on $interface have the maclist option specified" fi if [ x${mac:=-} = x- ]; then if [ -z "$addresses" ]; then fatal_error "You must specify a MAC address or an IP address" else macpart= fi else macpart=$(mac_match $mac) fi if [ -z "$addresses" ]; then [ -n "$level" ] && \ log_rule_limit $level $chain $(mac_chain $interface) $disposition "$LOGLIMIT" "" -A -t $MACLIST_TABLE $macpart $physdev_part run_iptables -A $chain -t $MACLIST_TABLE $macpart $physdev_part -j $target else for address in $(separate_list $addresses) ; do [ -n "$level" ] && \ log_rule_limit $level $chain $(mac_chain $interface) $disposition "$LOGLIMIT" "" -A -t $MACLIST_TABLE $macpart -s $address $physdev_part run_iptables2 -A $chain -t $MACLIST_TABLE $macpart -s $address $physdev_part -j $target done fi done < $TMP_DIR/maclist # # Must take care of our own broadcasts and multicasts then terminate the verification # chains # for interface in $maclist_interfaces; do [ -n "$MACLIST_TTL" ] && chain=$(macrecent_target $interface) || chain=$(mac_chain $interface) if [ -n "$MACLIST_LOG_LEVEL" -o $MACLIST_DISPOSITION != ACCEPT ]; then indent >&3 << __EOF__ blob=\$(ip link show $interface 2> /dev/null) [ -z "\$blob" ] && \ fatal_error "Interface $interface must be up before Shorewall can start" ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet //; s/brd //; s/scope.*//;' | while read address broadcast; do address=\${address%/*} if [ -n "\$broadcast" ]; then run_iptables -t $MACLIST_TABLE -A $chain -s \$address -d \$broadcast -j RETURN fi run_iptables -t $MACLIST_TABLE -A $chain -s \$address -d 255.255.255.255 -j RETURN run_iptables -t $MACLIST_TABLE -A $chain -s \$address -d 224.0.0.0/4 -j RETURN done __EOF__ fi if [ -n "$MACLIST_LOG_LEVEL" ]; then log_rule_limit $MACLIST_LOG_LEVEL $chain $(mac_chain $interface) $MACLIST_DISPOSITION "$LOGLIMIT" "" -A -t $MACLIST_TABLE fi if [ $MACLIST_DISPOSITION != ACCEPT ]; then run_iptables -A $chain -t $MACLIST_TABLE -j $maclist_target fi done # # Generate jumps from the input and forward chains # for hosts in $maclist_hosts; do ipsec=${hosts%^*} hosts=${hosts#*^} [ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy= interface=${hosts%%:*} hosts=${hosts#*:} case $MACLIST_TABLE in filter) for chain in $(first_chains $interface) ; do run_iptables -A $chain $(match_source_hosts $hosts) -m state --state NEW \ $policy -j $(mac_chain $interface) done ;; *) run_iptables -t mangle -A PREROUTING -i $interface $(match_source_hosts $hosts) -m state --state NEW \ $policy -j $(mac_chain $interface) ;; esac done } # # Set up SYN flood protection # setup_syn_flood_chain () # $1 = policy chain # $2 = synparams # $3 = loglevel { local chain=@$1 local limit=$2 local limit_burst= case $limit in *:*) limit_burst="--limit-burst ${limit#*:}" limit=${limit%:*} ;; esac run_iptables -N $chain run_iptables -A $chain -m limit --limit $limit $limit_burst -j RETURN [ -n "$3" ] && \ log_rule_limit $3 $chain $chain DROP "-m limit --limit 5/min --limit-burst 5" "" "" run_iptables -A $chain -j DROP } setup_syn_flood_chains() { for chain in $ALL_POLICY_CHAINS; do eval loglevel=\$${chain}_loglevel eval synparams=\$${chain}_synparams [ -n "$synparams" ] && setup_syn_flood_chain $chain $synparams $loglevel done } # # Delete existing Proxy ARP # delete_proxy_arp() { indent >&3 << __EOF__ if [ -f \${VARDIR}/proxyarp ]; then while read address interface external haveroute; do qt arp -i \$external -d \$address pub [ -z "\$haveroute" -a -z "\$NOROUTE" ] && qt ip route del \$address dev \$interface done < \${VARDIR}/proxyarp rm -f \${VARDIR}/proxyarp fi for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/proxy_arp ] && echo 0 > \$f/proxy_arp done __EOF__ [ -d $STATEDIR ] && touch $STATEDIR/proxyarp } # # Setup Static Network Address Translation (NAT) # setup_nat() { local external= interface= internal= allints= localnat= policyin= policyout= validate_one() #1 = Variable Name, $2 = Column name, $3 = value { case $3 in Yes|yes) ;; No|no) eval ${1}= ;; *) [ -n "$3" ] && \ fatal_error "Invalid value ($3) for $2 in entry \"$external $interface $internal $allints $localnat\"" ;; esac } do_one_nat() { local add_ip_aliases=$ADD_IP_ALIASES iface=${interface%:*} if [ -n "$add_ip_aliases" ]; then case $interface in *:) interface=${interface%:} add_ip_aliases= ;; *) [ -n "$RETAIN_ALIASES" ] || save_command del_ip_addr $external $iface ;; esac else interface=${interface%:} fi validate_one allints "ALL INTERFACES" $allints validate_one localnat "LOCAL" $localnat if [ -n "$allints" ]; then addnatrule nat_in -d $external $policyin -j DNAT --to-destination $internal addnatrule nat_out -s $internal $policyout -j SNAT --to-source $external else addnatrule $(input_chain $iface) -d $external $policyin -j DNAT --to-destination $internal addnatrule $(output_chain $iface) -s $internal $policyout -j SNAT --to-source $external fi [ -n "$localnat" ] && \ run_iptables2 -t nat -A OUTPUT -d $external $policyout -j DNAT --to-destination $internal if [ -n "$add_ip_aliases" ]; then list_search $external $ALIASES_TO_ADD || \ ALIASES_TO_ADD="$ALIASES_TO_ADD $external $interface" fi } # # At this point, we're just interested in the network translation # > $STATEDIR/nat if [ -n "$POLICY_MATCH" ]; then policyin="-m policy --pol none --dir in" policyout="-m policy --pol none --dir out" fi [ -n "$RETAIN_ALIASES" ] || save_progress_message "Setting up one-to-one NAT..." while read external interface internal allints localnat; do expandv external interface internal allints localnat do_one_nat progress_message_and_save " 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 [ -d $STATEDIR ] && touch $STATEDIR/nat indent >&3 << __EOF__ if [ -f \${VARDIR}/nat ]; then while read external interface; do ip_addr_del \$external \$interface done < \${VARDIR}/nat rm -f \${VARDIR}/nat fi __EOF__ } # # Setup Network Mapping (NETMAP) # setup_netmap() { while read type net1 interface net2 ; do expandv type net1 interface net2 list_search $interface $ALL_INTERFACES || \ fatal_error "Unknown interface $interface in entry \"$type $net1 $interface $net2\"" case $type in DNAT) addnatrule $(input_chain $interface) -d $net1 -j NETMAP --to $net2 ;; SNAT) addnatrule $(output_chain $interface) -s $net1 -j NETMAP --to $net2 ;; *) fatal_error "Invalid type $type in entry \"$type $net1 $interface $net2\"" ;; esac progress_message_and_save " Network $net1 on $interface mapped to $net2 ($type)" done < $TMP_DIR/netmap } # # Setup ECN disabling rules # setup_ecn() # $1 = file name { local interfaces="" local hosts= local h strip_file ecn $1 progress_message2 "$DOING $1..." while read interface host; do expandv interface host list_search $interface $ALL_INTERFACES || \ fatal_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 progress_message "$DOING ECN control on${interfaces}..." for interface in $interfaces; do chain=$(ecn_chain $interface) if havemanglechain $chain; then flushmangle $chain else createmanglechain $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 $(dest_ip_range $h) -j ECN --ecn-tcp-remove progress_message_and_save " ECN Disabled to $h through $interface" done fi } # # Set up an exclusion chain # build_exclusion_chain() # $1 = variable to store chain name into $2 = table, $3 = SOURCE exclusion list, $4 = DESTINATION exclusion list { local c=excl_${EXCLUSION_SEQ} net EXCLUSION_SEQ=$(( $EXCLUSION_SEQ + 1 )) run_iptables -t $2 -N $c for net in $(separate_list $3); do run_iptables -t $2 -A $c $(source_ip_range $net) -j RETURN done for net in $(separate_list $4); do run_iptables -t $2 -A $c $(dest_ip_range $net) -j RETURN done case $2 in filter) eval exists_${c}=Yes ;; nat) eval exists_nat_${c}=Yes ;; esac eval $1=$c } # # Setup queuing and classes # setup_tc1() { local mark_part= # # Create the TC mangle chains # createmanglechain tcpre if [ -n "$MANGLE_FORWARD" ]; then createmanglechain tcfor createmanglechain tcpost fi createmanglechain tcout # # Process the TC Rules File # strip_file tcrules while read mark sources dests proto ports sports user testval length tos; do expandv mark sources dests proto ports sports user testval length tos rule=$(echo "$mark $sources $dests $proto $ports $sports $user $testval $length $tos") process_tc_rule done < $TMP_DIR/tcrules # # Link to the TC mangle chains from the main chains # # # Route marks are restored in PREROUTING/OUTPUT prior to these rules. We only send # packets that are not part of a marked connection to the 'tcpre/tcout' chains. # if [ -n "$ROUTEMARK_INTERFACES" ]; then mark_part="-m mark --mark 0/0xFF00" # # But let marks in tcpre override those assigned by 'track' # for interface in $ROUTEMARK_INTERFACES; do run_iptables -t mangle -A PREROUTING -i $interface -j tcpre done fi run_iptables -t mangle -A PREROUTING $mark_part -j tcpre run_iptables -t mangle -A OUTPUT $mark_part -j tcout if [ -n "$MANGLE_FORWARD" ]; then run_iptables -t mangle -A FORWARD -j tcfor run_iptables -t mangle -A POSTROUTING -j tcpost fi if [ -n "$HIGH_ROUTE_MARKS" ]; then for chain in INPUT FORWARD; do run_iptables -t mangle -I $chain -j MARK --and-mark 0xFF done fi if [ -n "$TC_SCRIPT" ]; then save_progress_message "Setting up Traffic Control..." append_file $TC_SCRIPT elif [ -n "$TC_ENABLED" ]; then setup_traffic_shaping fi } setup_tc() { progress_message2 "$DOING Traffic Control Rules..." setup_tc1 } # # Clear Traffic Shaping # delete_tc() { clear_one_tc() { save_command "tc qdisc del dev $1 root 2> /dev/null" save_command "tc qdisc del dev $1 ingress 2> /dev/null" } save_progress_message "Clearing Traffic Control/QOS" append_file tcclear indent >&3 << __EOF__ ip link list | while read inx interface details; do case \$inx in [0-9]*) qt tc qdisc del dev \${interface%:} root qt tc qdisc del dev \${interface%:} ingress ;; *) ;; esac done __EOF__ } # # Process a record from the accounting file # process_accounting_rule() { rule= rule2= jumpchain= user1= accounting_error() { error_message "WARNING: Invalid Accounting rule" $action $chain $source $dest $proto $port $sport $user } accounting_interface_error() { error_message "WARNING: Unknown interface $1 in " $action $chain $source $dest $proto $port $sport $user } accounting_interface_verify() { verify_interface $1 || accounting_interface_error $1 } jump_to_chain() { if ! havechain $jumpchain; then if ! createchain2 $jumpchain No; then accounting_error return 2 fi fi rule="$rule -j $jumpchain" } do_ipp2p() { [ -n "$IPP2P_MATCH" ] || fatal_error "Your kernel and/or iptables does not have IPP2P match support" case $proto in *:*) proto=${proto#*:} ;; *) proto=tcp ;; esac rule="$rule -p $proto -m ipp2p --${port:-ipp2p}" } case $source in *:*) accounting_interface_verify ${source%:*} rule="$(source_ip_range ${source#*:}) $(match_source_dev ${source%:*})" ;; *.*.*.*|+*|!+*) rule="$(source_ip_range $source)" ;; -|all|any) ;; *) if [ -n "$source" ]; then accounting_interface_verify $source rule="$(match_source_dev $source)" fi ;; esac [ -n "$dest" ] && case $dest in *:*) accounting_interface_verify ${dest%:*} rule="$rule $(dest_ip_range ${dest#*:}) $(match_dest_dev ${dest%:*})" ;; *.*.*.*|+*|!*) rule="$rule $(dest_ip_range $dest)" ;; -|all|any) ;; *) accounting_interface_verify $dest rule="$rule $(match_dest_dev $dest)" ;; esac [ -n "$proto" ] && case $proto in -|any|all) ;; ipp2p|IPP2P|ipp2p:*|IPP2P:*) do_ipp2p ;; *) rule="$rule -p $proto" ;; esac multiport= [ -n "$port" ] && case $port in -|any|all) ;; *) if [ -n "$MULTIPORT" ]; then rule="$rule -m multiport --dports $port" multiport=Yes else rule="$rule --dport $port" fi ;; esac [ -n "$sport" ] && case $sport in -|any|all) ;; *) if [ -n "$MULTIPORT" ]; then [ -n "$multiport" ] && rule="$rule --sports $sport" || rule="$rule -m multiport --sports $sport" else rule="$rule --sport $sport" fi ;; esac [ -n "$user" ] && case $user in -|any|all) ;; *) [ "$chain" != OUTPUT ] && \ fatal_error "Invalid use of a user/group: chain is not OUTPUT but $chain" rule="$rule -m owner" user1="$user" case "$user" in !*+*) if [ -n "${user#*+}" ]; then rule="$rule ! --cmd-owner ${user#*+} " fi user1=${user%+*} ;; *+*) if [ -n "${user#*+}" ]; then rule="$rule --cmd-owner ${user#*+} " fi user1=${user%+*} ;; esac case "$user1" in !*:*) if [ "$user1" != "!:" ]; then temp="${user1#!}" temp="${temp%:*}" [ -n "$temp" ] && rule="$rule ! --uid-owner $temp " temp="${user1#*:}" [ -n "$temp" ] && rule="$rule ! --gid-owner $temp " fi ;; *:*) if [ "$user1" != ":" ]; then temp="${user1%:*}" [ -n "$temp" ] && rule="$rule --uid-owner $temp " temp="${user1#*:}" [ -n "$temp" ] && rule="$rule --gid-owner $temp " fi ;; !*) [ "$user1" != "!" ] && rule="$rule ! --uid-owner ${user1#!} " ;; *) [ -n "$user1" ] && rule="$rule --uid-owner $user1 " ;; esac ;; esac case $action in COUNT) ;; DONE) rule="$rule -j RETURN" ;; *:COUNT) rule2="$rule" jumpchain=${action%:*} jump_to_chain || return ;; JUMP:*) jumpchain=${action#*:} jump_to_chain || return ;; *) jumpchain=$action jump_to_chain || return ;; esac [ "x${chain:=accounting}" = "x-" ] && chain=accounting ensurechain1 $chain if do_iptables -A $chain $(fix_bang $rule) ; then [ -n "$rule2" ] && run_iptables2 -A $jumpchain $rule2 progress_message " Accounting rule" $action $chain $source $dest $proto $port $sport $user $DONE save_progress_message_short " Accounting rule $action $chain $source $dest $proto $port $sport $user Added" else accounting_error fi } # # Set up Accounting # setup_accounting() # $1 = Name of accounting file { progress_message2 "$DOING Accounting..." save_progress_message "Setting up Accounting..." strip_file accounting $1 while read action chain source dest proto port sport user ; do expandv action chain source dest proto port sport user process_accounting_rule done < $TMP_DIR/accounting if havechain accounting; then for chain in INPUT FORWARD OUTPUT; do run_iptables -I $chain -j accounting done fi } # # Add one Filter Rule from an action -- Helper function for the action file processor # # The caller has established the following variables: # COMMAND = current command. # client = SOURCE IP or MAC # server = DESTINATION IP or interface # protocol = Protocol # address = Original Destination Address # port = Destination Port # cport = Source Port # multioption = String to invoke multiport match if appropriate # action = The chain for this rule # ratelimit = Optional rate limiting clause # userandgroup = owner match clause # logtag = Log tag # add_an_action() { local chain1 do_ports() { if [ -n "$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 } interface_error() { fatal_error "Unknown interface $1 in rule: \"$rule\"" } action_interface_verify() { verify_interface $1 || interface_error $1 } handle_exclusion() { build_exclusion_chain chain1 filter "$excludesource" "$excludedest" run_iptables -A $chain $(fix_bang $cli $proto $sports $multiport $dports) $user -j $chain1 cli= proto= sports= multiport= dports= user= } do_ipp2p() { [ -n "$IPP2P_MATCH" ] || fatal_error "Your kernel and/or iptables does not have IPP2P match support. Rule: \"$rule\"" dports="-m ipp2p --${port:-ipp2p}" case $proto in ipp2p|IPP2P) proto=tcp port= do_ports ;; ipp2p:udpIPP2P:UDP) proto=udp port= do_ports ;; ipp2p:all|IPP2P:ALL) proto=all ;; esac } # Set source variables. The 'cli' variable will hold the client match predicate(s). cli= case "$client" in -) ;; *:*) action_interface_verify ${client%:*} cli="$(match_source_dev ${client%:*}) $(source_ip_range ${client#*:})" ;; *.*.*|+*|!+*) cli="$(source_ip_range $client)" ;; ~*|!~*) cli=$(mac_match $client) ;; *) if [ -n "$client" ]; then action_interface_verify $client cli="$(match_source_dev $client)" fi ;; esac # Set destination variables - 'serv' and 'dest_interface' hold the server match predicate(s). dest_interface= serv= case "$server" in -) ;; *.*.*|+*|!+*) serv=$server ;; ~*|!~*) fatal_error "Rule \"$rule\" - Destination may not be specified by MAC Address" ;; *) if [ -n "$server" ]; then action_interface_verify $server dest_interface="$(match_dest_dev $server)" fi ;; esac # Setup protocol and port variables sports= dports= proto=$protocol servport=$serverport multiport= chain1=$chain user="$userandgroup" [ x$port = x- ] && port= [ x$cport = x- ] && cport= case $proto in tcp|TCP|6) do_ports ;; tcp:syn) proto="$proto --syn" do_ports ;; udp|UDP|17) do_ports ;; icmp|ICMP|1) [ -n "$port" ] && dports="--icmp-type $port" ;; ipp2p|IPP2P|ipp2p:*|IPP2P:*) do_ipp2p ;; *) [ -n "$port" ] && \ fatal_error "Port number not allowed with protocol \"$proto\"; rule: \"$rule\"" ;; esac proto="${proto:+-p $proto}" # Some misc. setup case "$logtarget" in LOG) [ -z "$loglevel" ] && fatal_error "LOG requires log level" ;; esac if [ -n "${excludesource}${excludedest}" ]; then handle_exclusion fi if [ -n "${serv}" ]; then for serv1 in $(separate_list $serv); do for srv in $(firewall_ip_range $serv1); do if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain1 $action $logtarget "$ratelimit" "$logtag" -A $user \ $(fix_bang $proto $sports $multiport $cli $(dest_ip_range $srv) $dports) fi run_iptables2 -A $chain1 $proto $multiport $cli $sports \ $(dest_ip_range $srv) $dports $ratelimit $user -j $target done done else if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain1 $action $logtarget "$ratelimit" "$logtag" -A $user \ $(fix_bang $proto $sports $multiport $cli $dest_interface $dports) fi run_iptables2 -A $chain1 $proto $multiport $cli $dest_interface $sports \ $dports $ratelimit $user -j $target fi } # # Process a record from an action file # process_action() # $1 = chain (Chain to add the rules to) # $2 = action (The action name for logging purposes) # $3 = target (The (possibly modified) contents of the TARGET column) # $4 = clients # $5 = servers # $6 = protocol # $7 = ports # $8 = cports # $9 = ratelimit # $10 = userspec { local chain="$1" local action="$2" local target="$3" local clients="$4" local servers="$5" local protocol="$6" local ports="$7" local cports="$8" local ratelimit="$9" local userspec="${10}" local userandgroup= local logtag= if [ -n "$ratelimit" ]; then case $ratelimit in -) ratelimit= ;; *:*) ratelimit="-m limit --limit ${ratelimit%:*} --limit-burst ${ratelimit#*:}" ;; *) ratelimit="-m limit --limit $ratelimit" ;; esac fi [ "x$userspec" = "x-" ] && userspec= if [ -n "$userspec" ]; then userandgroup="-m owner" case "$userspec" in !*+*) if [ -n "${userspec#*+}" ]; then userandgroup="$userandgroup ! --cmd-owner ${userspec#*+}" fi userspec=${userspec%+*} ;; *+*) if [ -n "${userspec#*+}" ]; then userandgroup="$userandgroup --cmd-owner ${userspec#*+}" fi userspec=${userspec%+*} ;; esac case "$userspec" in !*:*) if [ "$userspec" != "!:" ]; then temp="${userspec#!}" temp="${temp%:*}" [ -n "$temp" ] && userandgroup="$userandgroup ! --uid-owner $temp" temp="${userspec#*:}" [ -n "$temp" ] && userandgroup="$userandgroup ! --gid-owner $temp" fi ;; *:*) if [ "$userspec" != ":" ]; then temp="${userspec%:*}" [ -n "$temp" ] && userandgroup="$userandgroup --uid-owner $temp" temp="${userspec#*:}" [ -n "$temp" ] && userandgroup="$userandgroup --gid-owner $temp" fi ;; !*) [ "$userspec" != "!" ] && userandgroup="$userandgroup ! --uid-owner ${userspec#!}" ;; *) [ -n "$userspec" ] && userandgroup="$userandgroup --uid-owner $userspec" ;; esac [ "$userandgroup" = "-m owner" ] && userandgroup= fi # Isolate log level if [ "$target" = "${target%:*}" ]; then loglevel= else loglevel="${target#*:}" target="${target%%:*}" expandv loglevel if [ "$loglevel" != "${loglevel%:*}" ]; then logtag="${loglevel#*:}" loglevel="${loglevel%:*}" expandv logtag fi case $loglevel in none*) loglevel= [ $target = LOG ] && return ;; esac loglevel=${loglevel%\!} fi logtarget="$target" case $target in REJECT) target=reject ;; CONTINUE) target=RETURN ;; *) ;; esac excludesource= case ${clients:=-} in *!*!*) fatal_error "Invalid SOURCE in rule \"$rule\"" ;; !*) if [ $(list_count $clients) -gt 1 ]; then excludesource=${clients#!} clients= fi ;; *!*) excludesource=${clients#*!} clients=${clients%!*} ;; esac excludedest= case ${servers:=-} in *!*!*) fatal_error "Invalid DEST in rule \"$rule\"" ;; !*) if [ $(list_count $servers) -gt 1 ]; then excludedest=${servers#*!} servers= fi ;; *!*) excludedest=${servers#*!} servers=${servers%!*} ;; esac # Generate Netfilter rule(s) [ "x$protocol" = "x-" ] && protocol=all || protocol=${protocol:=all} if [ -n "$XMULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ $(( $(list_count $ports) + $(list_count1 $(split $ports ) ) )) -le 16 -a \ $(( $(list_count $cports) + $(list_count1 $(split $cports ) ) )) -le 16 ] then # # Extended MULTIPORT is enabled, and less than # 16 ports are listed (port ranges count as two ports) - use multiport match. # multioption="-m multiport" for client in $(separate_list $clients); do for server in $(separate_list $servers); do # # add_an_action() modifies these so we must set their values each time # port=${ports:=-} cport=${cports:=-} add_an_action done done elif [ -n "$MULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ "$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 $servers); do # # add_an_action() modifies these so we must set their values each time # port=${ports:=-} cport=${cports:=-} add_an_action 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 ${cports:=-}); do add_an_action done done done done fi # # Report Result # progress_message " Rule \"$rule\" $DONE." save_progress_message_short " Rule \"$rule\" added." } # # Source the extension script for an action, if any # process_action_file() # $1 = File Name { local user_exit=$(find_file $1) if [ -f $user_exit ]; then progress_message "Processing $user_exit ..." . $user_exit fi } # # Create and record a log action chain -- Log action chains have names # that are formed from the action name by prepending a "%" and appending # a 1- or 2-digit sequence number. In the functions that follow, # the CHAIN, LEVEL and TAG variable serves as arguments to the user's # exit. We call the exit corresponding to the name of the action but we # set CHAIN to the name of the iptables chain where rules are to be added. # Similarly, LEVEL and TAG contain the log level and log tag respectively. # # For each , we maintain two variables: # # _actchain - The action chain number. # _chains - List of ( level[:tag] , chainname ) pairs # # The maximum length of a chain name is 30 characters -- since the log # action chain name is 2-3 characters longer than the base chain name, # this function truncates the original chain name where necessary before # it adds the leading "%" and trailing sequence number. createlogactionchain() # $1 = Action Name, $2 = Log Level [: Log Tag ] { local actchain= action=$1 level=$2 eval actchain=\${${action}_actchain} case ${#action} in 29|30) CHAIN=$(echo $action | truncate 28) # %...n makes 30 ;; *) CHAIN=${action} ;; esac while havechain %${CHAIN}${actchain}; do actchain=$(($actchain + 1)) [ $actchain -eq 10 -a ${#CHAIN} -eq 28 ] && CHAIN=$(echo $CHAIN | truncate 27) # %...nn makes 30 done CHAIN=%${CHAIN}${actchain} eval ${action}_actchain=$(($actchain + 1)) createchain $CHAIN No LEVEL=${level%:*} if [ "$LEVEL" != "$level" ]; then TAG=${level#*:} else TAG= fi [ none = "${LEVEL%\!}" ] && LEVEL= process_action_file $1 eval ${action}_chains=\"\$${action}_chains $level $CHAIN\" } # # Create an action chain and run it's associated user exit # createactionchain() # $1 = Action, including log level and tag if any { case $1 in *::*) fatal_error "Invalid ACTION $1" ;; *:*:*) set -- $(split $1) createlogactionchain $1 $2:$3 ;; *:*) set -- $(split $1) createlogactionchain $1 $2 ;; *) CHAIN=$1 LEVEL= TAG= createchain $CHAIN no process_action_file $CHAIN ;; esac } # # Find the chain that handles the passed action. If the chain cannot be found, # a fatal error is generated and the function does not return. # find_logactionchain() # $1 = Action, including log level and tag if any { local fullaction=$1 action=${1%%:*} level= chains= case $fullaction in *:*) level=${fullaction#*:} ;; *) havechain $action || fatal_error "Fatal error in find_logactionchain" echo $action return ;; esac eval chains="\$${action}_chains" set -- $chains while [ $# -gt 0 ]; do [ "$1" = "$level" ] && { echo $2 ; return ; } shift 2 done fatal_error "Fatal error in find_logactionchain" } # # This function determines the logging for a subordinate action or a rule within a subordinate action # merge_levels() # $1=level at which superior action is called, $2=level at which the subordinate rule is called { local superior=$1 subordinate=$2 set -- $(split $1) case $superior in *:*:*) case $2 in 'none!') echo ${subordinate%%:*}:'none!':$3 return ;; *'!') echo ${subordinate%%:*}:$2:$3 return ;; *) case $subordinate in *:*:*) echo $subordinate return ;; *:*) echo $subordinate:$3 return ;; *) echo ${subordinate%%:*}:$2:$3 return ;; esac ;; esac ;; *:*) case $2 in 'none!') echo ${subordinate%%:*}:'none!' return ;; *'!') echo ${subordinate%%:*}:$2 return ;; *) case $subordinate in *:*) echo $subordinate return ;; *) echo ${subordinate%%:*}:$2 return ;; esac ;; esac ;; *) echo $subordinate ;; esac } # This function substitutes the second argument for the first part of the first argument up to the first colon (":") # # Example: # # substitute_action DNAT PARAM:info:FTP # # produces "DNAT:info:FTP" # substitute_action() # $1 = parameter, $2 = action { local logpart=${2#*:} case $2 in *:*) echo $1:${logpart%/} ;; *) echo $1 ;; esac } # # This function maps old action names into their new macro equivalents # map_old_action() # $1 = Potential Old Action { local macro= aktion if [ -n "$MAPOLDACTIONS" ]; then case $1 in */*) echo $1 return ;; *) if [ -f $(find_file $1) ]; then echo $1 return fi case $1 in Allow*) macro=${1#*w} aktion=ACCEPT ;; Drop*) macro=${1#*p} aktion=DROP ;; Reject*) macro=${1#*t} aktion=REJECT ;; *) echo $1 return ;; esac esac if [ -f $(find_file macro.$macro) ]; then echo $macro/$aktion return fi fi echo $1 } # # Combine a source/dest from the macro body with one from the macro invocation # merge_macro_source_dest() # $1 = source/dest from macro body, $2 = source/dest from invocation { case $2 in -) echo ${1} ;; *.*.*|+*|~*|!~*) # # Value in the invocation is an address -- put it behind the value from the macro # echo ${1}:${2} ;; *) echo ${2}:${1} ;; esac } # # The next three functions implement the three phases of action processing. # # The first phase (process_actions1) occurs before the rules file is processed. ${SHAREDIR}/actions.std # and ${CONFDIR}/actions are scanned (in that order) and for each action: # # a) The related action definition file is located and scanned. # b) Forward and unresolved action references are trapped as errors. # c) A dependency graph is created. For each , the variable 'requiredby_' lists the # action[:level[:tag]] of each action invoked by . # d) All actions are listed in the global variable ACTIONS. # e) Common actions are recorded (in variables of the name _common) and are added to the global # USEDACTIONS # # As the rules file is scanned, each action[:level[:tag]] is merged onto the USEDACTIONS list. When an # is merged onto this list, its action chain is created. Where logging is specified, a chain with the name # %n is used where the name is truncated on the right where necessary to ensure that the total # length of the chain name does not exceed 30 characters. # # The second phase (process_actions2) occurs after the rules file is scanned. The transitive closure of # USEDACTIONS is generated; again, as new actions are merged onto this list, their action chains are created. # # The final phase (process_actions3) is to traverse the USEDACTIONS list populating each chain appropriately # by reading the action definition files and creating rules. Note that a given action definition file is # processed once for each unique [:level[:tag]] applied to an invocation of the action. # process_actions1() { ACTIONS="dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP allowoutUPnP forwardUPnP" USEDACTIONS= strip_file actions strip_file actions.std ${SHAREDIR}/actions.std for inputfile in actions.std actions; do while read xaction rest; do [ "x$rest" = x ] || fatal_error "Invalid Action: $xaction $rest" case $xaction in *:*) temp=${xaction#*:} [ ${#temp} -le 30 ] || fatal_error "Action Name Longer than 30 Characters: $temp" xaction=${xaction%:*} case $temp in ACCEPT|REJECT|DROP|QUEUE) eval ${temp}_common=$xaction if [ -n "$xaction" ] && ! list_search $xaction $USEDACTIONS; then USEDACTIONS="$USEDACTIONS $xaction" fi ;; *) fatal_error "Common Actions are only allowed for ACCEPT, DROP, REJECT and QUEUE" ;; esac esac [ -z "$xaction" ] && continue [ "$xaction" = "$(chain_base $xaction)" ] || fatal_error "Invalid Action Name: $xaction" if ! list_search $xaction $ACTIONS; then f=action.$xaction fn=$(find_file $f) eval requiredby_${action}= if [ -f $fn ]; then progress_message2 " Pre-processing $fn..." strip_file $f $fn while read xtarget xclients xservers xprotocol xports xcports xratelimit $xuserspec; do expandv xtarget temp="${xtarget%%:*}" case "$temp" in ACCEPT|DROP|REJECT|LOG|QUEUE|CONTINUE) ;; *) if list_search $temp $ACTIONS; then eval requiredby=\"\$requiredby_${xaction}\" list_search $xtarget $requiredby || eval requiredby_${xaction}=\"$requiredby $xtarget\" else temp=$(map_old_action $temp) case $temp in */*) param=${temp#*/} case $param in ACCEPT|DROP|REJECT|LOG|QUEUE|CONTINUE) ;; *) rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xratelimit $xuserspec" fatal_error "Invalid Macro Parameter in rule \"$rule\"" ;; esac temp=${temp%%/*} ;; esac f1=macro.${temp} fn=$(find_file $f1) if [ ! -f $TMP_DIR/$f1 ]; then # # We must only verify macros once to ensure that they don't invoke any non-standard actions # if [ -f $fn ]; then strip_file $f1 $fn progress_message " ..Expanding Macro $fn..." while read mtarget mclients mservers mprotocol mports mcports mratelimit muserspec; do expandv mtarget temp="${mtarget%%:*}" case "$temp" in ACCEPT|DROP|REJECT|LOG|QUEUE|CONTINUE|PARAM) ;; *) rule="$mtarget $mclients $mservers $mprotocol $mports $mcports $mratelimit $muserspec" fatal_error "Invalid TARGET in rule \"$rule\"" esac done < $TMP_DIR/$f1 progress_message " ..End Macro" else rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xratelimit $xuserspec" fatal_error "Invalid TARGET in rule \"$rule\"" fi fi fi ;; esac done < $TMP_DIR/$f else fatal_error "Missing Action File: $f" fi ACTIONS="$ACTIONS $xaction" fi done < $TMP_DIR/$inputfile done } process_actions2() { local interfaces="$(find_interfaces_by_option upnp)" if [ -n "$interfaces" ]; then if ! list_search forwardUPnP $USEDACTIONS; then error_message "WARNING:Missing forwardUPnP rule (required by 'upnp' interface option on $interfaces)" fi fi progress_message " Generating Transitive Closure of Used-action List..." changed=Yes while [ -n "$changed" ]; do changed= for xaction in $USEDACTIONS; do eval required=\"\$requiredby_${xaction%%:*}\" for xaction1 in $required; do # # Generate the action that will be passed to process_action by merging the # logging specified when the action was invoked with the logging in the # invocation of the subordinate action (usually no logging) # xaction2=$(merge_levels $xaction $xaction1) if ! list_search $xaction2 $USEDACTIONS; then # # We haven't seen this one before -- create and record a chain to handle it # USEDACTIONS="$USEDACTIONS $xaction2" createactionchain $xaction2 changed=Yes fi done done done } process_actions3() { for xaction in $USEDACTIONS; do # # Find the chain associated with this action:level:tag # xchain=$(find_logactionchain $xaction) # # Split the action:level:tag # set -- $(split $xaction) xaction1=$1 xlevel=$2 xtag=$3 save_progress_message "Creating action chain $xaction1" # # Handle Builtin actions # case $xaction1 in dropBcast) if [ -n "$USEPKTTYPE" ]; then case $xlevel in none'!') ;; *) if [ -n "$xlevel" ]; then log_rule_limit ${xlevel%\!} $xchain dropBcast DROP "" "$xtag" -A -m pkttype --pkt-type broadcast log_rule_limit ${xlevel%\!} $xchain dropBcast DROP "" "$xtag" -A -m pkttype --pkt-type multicast fi ;; esac run_iptables -A dropBcast -m pkttype --pkt-type broadcast -j DROP run_iptables -A dropBcast -m pkttype --pkt-type multicast -j DROP else for interface in $(find_bcastdetect_interfaces); do indent >&3 << __EOF__ ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u | while read address; do __EOF__ case $xlevel in none*) ;; *) [ -n "$xlevel" ] && \ indent >&3 << __EOF__ log_rule_limit ${xlevel%\!} $xchain dropBcast DROP "" "$xtag" -A -d \$address __EOF__ ;; esac indent >&3 << __EOF__ run_iptables -A $xchain -d \$address -j DROP done __EOF__ done for address in $(find_broadcasts) 255.255.255.255 224.0.0.0/4 ; do case $xlevel in none*) ;; *) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain dropBcast DROP "" "$xtag" -A -d $address ;; esac run_iptables -A $xchain -d $address -j DROP done fi ;; allowBcast) if [ -n "$USEPKTTYPE" ]; then case $xlevel in none'!') ;; *) if [ -n "$xlevel" ]; then log_rule_limit ${xlevel%\!} $xchain allowBcast ACCEPT "" "$xtag" -A -m pkttype --pkt-type broadcast log_rule_limit ${xlevel%\!} $xchain allowBcast ACCEPT "" "$xtag" -A -m pkttype --pkt-type multicast fi ;; esac run_iptables -A allowBcast -m pkttype --pkt-type broadcast -j ACCEPT run_iptables -A allowBcast -m pkttype --pkt-type multicast -j ACCEPT else for interface in $(find_bcastdetect_interfaces); do indent >&3 << __EOF__ ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u | while read address; do __EOF__ case $xlevel in none*) ;; *) [ -n "$xlevel" ] && \ indent >&3 << __EOF__ log_rule_limit ${xlevel%\!} $xchain allowBcast ACCEPT "" "$xtag" -A -d \$address __EOF__ ;; esac indent >&3 << __EOF__ run_iptables -A $xchain -d \$address -j ACCEPT done __EOF__ done for address in $(find_broadcasts) 255.255.255.255 224.0.0.0/4 ; do case $xlevel in none*) ;; *) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain allowBcast ACCEPT "" "$xtag" -A -d $address ;; esac run_iptables -A $xchain -d $address -j ACCEPT done fi ;; dropNotSyn) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain dropNotSyn DROP "" "$xtag" -A -p tcp ! --syn run_iptables -A $xchain -p tcp ! --syn -j DROP ;; rejNotSyn) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain rejNotSyn REJECT "" "$xtag" -A -p tcp ! --syn run_iptables -A $xchain -p tcp ! --syn -j REJECT --reject-with tcp-reset ;; dropInvalid) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain dropInvalid DROP "" "$xtag" -A -m state --state INVALID run_iptables -A $xchain -m state --state INVALID -j DROP ;; allowInvalid) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain allowInvalid ACCEPT "" "$xtag" -A -m state --state INVALID run_iptables -A $xchain -m state --state INVALID -j ACCEPT ;; forwardUPnP) ;; allowinUPnP) if [ -n "$xlevel" ]; then log_rule_limit ${xlevel%\!} $xchain allowinUPnP ACCEPT "" "$xtag" -A -p udp --dport 1900 log_rule_limit ${xlevel%\!} $xchain allowinUPnP ACCEPT "" "$xtag" -A -p tcp --dport 49152 fi run_iptables -A $xchain -p udp --dport 1900 -j ACCEPT run_iptables -A $xchain -p tcp --dport 49152 -j ACCEPT ;; allowoutUPnP) [ -n "$xlevel" ] && \ log_rule_limit ${xlevel%\!} $xchain allowoutUPnP ACCEPT "" "$xtag" -A -m owner --owner-cmd upnpd run_iptables -A $xchain -m owner --cmd-owner upnpd -j ACCEPT ;; *) # # Not a builtin # f=action.$xaction1 progress_message2 "$DOING $(find_file $f) for Chain $xchain..." while read xtarget xclients xservers xprotocol xports xcports xratelimit xuserspec; do expandv xtarget # # Generate the target:level:tag to pass to process_action() # xaction2=$(merge_levels $xaction $xtarget) is_macro= param= xtarget1=${xaction2%%:*} case $xtarget1 in ACCEPT|DROP|REJECT|LOG|QUEUE|CONTINUE) # # Builtin target -- Nothing to do # ;; *) if list_search $xtarget1 $ACTIONS ; then # # An Action -- Replace the target from the file # -- with the one generated above xtarget=$xaction2 # # And locate the chain for that action:level:tag # xaction2=$(find_logactionchain $xtarget) else is_macro=yes fi ;; esac expandv xclients xservers xprotocol xports xcports xratelimit xuserspec if [ -n "$is_macro" ]; then xtarget1=$(map_old_action $xtarget1) case $xtarget1 in */*) param=${xtarget1#*/} xtarget1=${xtarget1%%/*} ;; esac progress_message "..Expanding Macro $(find_file macro.$xtarget1)..." while read mtarget mclients mservers mprotocol mports mcports mratelimit muserspec; do expandv mtarget mclients mservers mprotocol mports mcports mratelimit muserspec mtarget=$(merge_levels $xaction2 $mtarget) case $mtarget in PARAM|PARAM:*) [ -n "$param" ] && mtarget=$(substitute_action $param $mtarget) || fatal_error "PARAM requires that a parameter be supplied in macro invocation" ;; esac if [ -n "$mclients" ]; then case $mclients in -|SOURCE) mclients=${xclients} ;; DEST) mclients=${xservers} ;; *) mclients=$(merge_macro_source_dest $mclients $xclients) ;; esac else mclients=${xclients} fi if [ -n "$mservers" ]; then case $mservers in -|DEST) mservers=${xservers} ;; SOURCE) mservers=${xclients} ;; *) mservers=$(merge_macro_source_dest $mservers $xservers) ;; esac else mservers=${xserverss} fi [ -n "$xprotocol" ] && [ "x${xprotocol}" != x- ] && mprotocol=$xprotocol [ -n "$xports" ] && [ "x${xports}" != x- ] && mports=$xports [ -n "$xcports" ] && [ "x${xcports}" != x- ] && mcports=$xcports [ -n "$xratelimit" ] && [ "x${xratelimit}" != x- ] && mratelimit=$xratelimit [ -n "$xuserspec" ] && [ "x${xuserspec}" != x- ] && muserspec=$xuserspec rule="$mtarget ${mclients:=-} ${mservers:=-} ${mprotocol:=-} ${mports:=-} ${mcports:=-} ${mratelimit:-} ${muserspec:=-}" process_action $xchain $xaction1 $mtarget $mclients $mservers $mprotocol $mports $mcports $mratelimit $muserspec done < $TMP_DIR/macro.$xtarget1 progress_message "..End Macro" else rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xratelimit $xuserspec" process_action $xchain $xaction1 $xaction2 $xclients $xservers $xprotocol $xports $xcports $xratelimit $xuserspec fi done < $TMP_DIR/$f ;; esac done } # # Add a NAT rule - Helper function for the rules file processor # # The caller has established the following variables: # COMMAND = The current command # 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 # ratelimit = Optional rate limiting clause # userandgroup = -m owner match to limit the rule to a particular user and/or group # logtag = Log tag # excludesource = Source Exclusion List # 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 fatal_error "SNAT may no longer be specified in a DNAT rule; use ${CONFDIR}/masq instead" fi # Set original destination address case $addr in all) addr= ;; detect) eval interfaces=\$${source}_interfaces if [ -n "$DETECT_DNAT_IPADDRS" -a "$source" != "$FW" ]; then save_command if [ $(list_count1 $interfaces) -eq 1 ]; then save_command "addr=\$(find_first_interface_address $interface)" else save_command "addr=" for interface in $interfaces; do ident >&3 << __EOF__ addr="\$addr \$(find_first_interface_address $interface)" __EOF__ done fi else addr= fi ;; !*) if [ $(list_count $addr) -gt 1 ]; then excludedests="${addr#\!}" addr= fi ;; esac addr=${addr:-0.0.0.0/0} # Select target if [ "$logtarget" = SAME ]; then [ -n "$servport" ] && fatal_error "Port mapping not allowed in SAME rules" serv1= for srv in $(separate_list $serv); do serv1="$serv1 --to ${srv}" done target1="SAME $serv1" elif [ -n "$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 $servport" fi # Generate nat table rules if [ "$source" = "$FW" ]; then if [ -n "${excludesource}${excludedests}" ]; then build_exclusion_chain chain nat "$excludesource" $excludedests for adr in $(separate_list $addr); do run_iptables2 -t nat -A OUTPUT $cli $proto $userandgroup $multiport $sports $dports $(dest_ip_range $adr) -j $chain done if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat fi addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection else for adr in $(separate_list $addr); do if [ -n "$loglevel" ]; then log_rule_limit $loglevel OUTPUT OUTPUT $logtarget "$ratelimit" "$logtag" -A -t nat \ $(fix_bang $proto $cli $sports $userandgroup $(dest_ip_range $adr) $multiport $dports) fi run_iptables2 -t nat -A OUTPUT $ratelimit $proto $sports $userandgroup $(dest_ip_range $adr) $multiport $dports -j $target1 done fi else if [ -n "${excludesource}${excludedests}" ]; then build_exclusion_chain chain nat "$excludesource" $excludedests if [ $addr = detect ]; then ensurenatchain $(dnat_chain $source) indent >&3 << __EOF__ for adr in \$addr; do run_iptables -t nat -A $(fix_bang $(dnat_chain $source) $cli $proto $multiport $sports $dports) -d \$adr -j $chain __EOF__ else for adr in $(separate_list $addr); do addnatrule $(dnat_chain $source) $cli $proto $multiport $sports $dports $(dest_ip_range $adr) -j $chain done fi if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain $(dnat_chain $source) $logtarget "$ratelimit" "$logtag" -A -t nat fi addnatrule $chain $ratelimit $proto -j $target1 # Protocol is necessary for port redirection else chain=$(dnat_chain $source) if [ $addr = detect ]; then ensurenatchain $chain indent >&3 << __EOF__ for adr in \$addr; do __EOF__ if [ -n "$loglevel" ]; then indent >&3 << __EOF__ log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat $(fix_bang $proto $cli $sports $multiport $dports) -d \$adr __EOF__ fi indent >&3 << __EOF__ run_iptables -t nat -A $chain $(fix_bang $proto $ratelimit $cli $sports $multiport $dports) -d \$adr -j $target1 __EOF__ else for adr in $(separate_list $addr); do if [ -n "$loglevel" ]; then ensurenatchain $chain log_rule_limit $loglevel $chain $chain $logtarget "$ratelimit" "$logtag" -A -t nat \ $(fix_bang $proto $cli $sports $(dest_ip_range $adr) $multiport $dports) fi addnatrule $chain $proto $ratelimit $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 ${servport#*:}" fi fi [ "x$addr" = "x0.0.0.0/0" ] && addr= ratelimit= } # # Process a record from the rules file # process_rule() # $1 = target # $2 = clients # $3 = servers # $4 = protocol # $5 = ports # $6 = cports # $7 = address # $8 = ratelimit # $9 = userspec { local target="$1" local clients="$2" local servers="$3" local protocol="$4" local ports="$5" local cports="$6" local address="$7" local ratelimit="$8" local userspec="$9" local userandgroup= local logtag= local nonat= # # Add one Filter Rule # # The caller has established the following variables: # COMMAND = current command. # which only goes through the motions. # client = SOURCE IP or MAC # server = DESTINATION IP or interface # protocol = Protocol # address = Original Destination Address # port = Destination Port # cport = Source Port # multioption = String to invoke multiport match if appropriate # servport = Port the server listens on # chain = The canonical chain for this rule # logchain = The chain that should be mentioned in log messages # ratelimit = Optional rate limiting clause # userandgroup = -m owner clause # userspec = User name # logtag = Log tag # policy = Applicable Policy # add_a_rule() { local natrule= do_ports() { if [ -n "$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 } interface_error() { fatal_error "Unknown interface $1 in rule: \"$rule\"" } rule_interface_verify() { verify_interface $1 || interface_error $1 } handle_exclusion() { build_exclusion_chain chain filter "$excludesource" "$excludedest" if [ -n "$addr" -a -n "$CONNTRACK_MATCH" ]; then for adr in $(separate_list $addr); do run_iptables -A $logchain $state $(fix_bang $proto $sports $multiport $dports) $user -m conntrack --ctorigdst $adr -j $chain done addr= else run_iptables -A $state $logchain $(fix_bang $cli $proto $sports $multiport $dports) $user -j $chain fi cli= proto= sports= multiport= dports= user= state= } do_ipp2p() { [ -n "$IPP2P_MATCH" ] || fatal_error "Your kernel and/or iptables does not have IPP2P match support. Rule: \"$rule\"" dports="-m ipp2p --${port:-ipp2p}" case $proto in ipp2p|IPP2P|ipp2p:tcp|IPP2P:TCP) port= proto=tcp do_ports ;; ipp2p:udp|IPP2P:UDP) port= proto=udp do_ports ;; ipp2p:all|IPP2P:ALL) port= proto=all ;; *) fatal_error "Invalid IPP2P protocol ${proto#*:}. Rule: \"$rule\"" ;; esac } # Set source variables. The 'cli' variable will hold the client match predicate(s). cli= case "$client" in -) ;; *:*) rule_interface_verify ${client%:*} cli="$(match_source_dev ${client%:*}) $(source_ip_range ${client#*:})" ;; *.*.*|+*) cli="$(source_ip_range $client)" ;; ~*|!~*) cli=$(mac_match $client) ;; *) if [ -n "$client" ]; then rule_interface_verify $client cli="$(match_source_dev $client)" fi ;; esac # Set destination variables - 'serv' and 'dest_interface' hold the server match predicate(s). dest_interface= serv= case "$server" in -) ;; *.*.*|+*) serv=$server ;; ~*|!~*) fatal_error "Rule \"$rule\" - Destination may not be specified by MAC Address" ;; *) if [ -n "$server" ]; then [ -n "$nonat" ] && fatal_error "Destination interface not allowed with $logtarget" rule_interface_verify $server dest_interface="$(match_dest_dev $server)" fi ;; esac # Setup protocol and port variables sports= dports= proto=$protocol addr=$address servport=$serverport multiport= user="$userandgroup" # Restore $chain to the canonical chain. chain=$logchain [ x$port = x- ] && port= [ x$cport = x- ] && cport= case $proto in tcp|TCP|6) do_ports ;; tcp:syn) proto="tcp --syn" do_ports ;; udp|UDP|17) do_ports ;; icmp|ICMP|1) [ -n "$port" ] && dports="--icmp-type $port" ;; all|ALL) [ -n "$port" ] && \ fatal_error "Port number not allowed with protocol \"all\"; rule: \"$rule\"" proto= ;; ipp2p|IPP2P|ipp2p:*|IPP2P:*) do_ipp2p ;; *) [ -n "$port" ] && \ fatal_error "Port number not allowed with protocol \"$proto\"; rule: \"$rule\"" ;; esac proto="${proto:+-p $proto}" # Some misc. setup case "$logtarget" in ACCEPT|DROP|REJECT|CONTINUE) if [ -z "$proto" -a -z "$cli" -a -z "$serv" -a -z "$servport" -a -z "$user" -a -z "$excludesource" -a -z "$excludedest" ] ; then error_message "WARNING -- Rule \"$rule\" is a POLICY" error_message " -- and should be moved to the policy file" fi ;; REDIRECT) [ -n "$excludedest" ] && fatal_error "Invalid DEST for this ACTION; rule \"$rule\"" [ -n "$serv" ] && \ fatal_error "REDIRECT rules cannot specify a server IP; rule: \"$rule\"" servport=${servport:=$port} natrule=Yes ;; DNAT|SAME) [ -n "$excludedest" ] && fatal_error "Invalid DEST for this ACTION; rule \"$rule\"" [ -n "$serv" ] || \ fatal_error "$logtarget rules require a server address; rule: \"$rule\"" natrule=Yes ;; LOG) [ -z "$loglevel" ] && \ fatal_error "LOG requires log level" ;; esac case $SECTION in ESTABLISHED|RELATED) [ -n "$FASTACCEPT" ] && fatal_error "Entries in the $SECTION SECTION of the rules file not permitted with FASTACCEPT=Yes" state="-m state --state $SECTION" ;; *) state= ;; esac if [ -n "${serv}${servport}" ]; then # A specific server or server port given if [ -n "$natrule" ]; then add_nat_rule [ $policy = ACCEPT ] && return elif [ -n "$servport" -a "$servport" != "$port" ]; then fatal_error "Only DNAT, SAME and REDIRECT rules may specify destination port mapping; rule \"$rule\"" fi if [ -n "${excludesource}${excludedest}" ]; then handle_exclusion fi if [ -z "$dnat_only" ]; then if [ -n "$serv" ]; then for serv1 in $(separate_list $serv); do for srv in $(firewall_ip_range $serv1); do if [ -n "$addr" -a -n "$CONNTRACK_MATCH" ]; then if [ "$addr" = detect ]; then indent >&3 << __EOF__ run_iptables -A $chain $state $proto $ratelimit $multiport $cli $sports $(dest_ip_range $srv) $dports -m conntrack --ctorigdst \$adr $user -j $target done __EOF__ else for adr in $(separate_list $addr); do if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule_limit $loglevel $chain $logchain $logtarget "$ratelimit" "$logtag" -A -m conntrack --ctorigdst $adr \ $user $(fix_bang $proto $sports $multiport $cli $(dest_ip_range $srv) $dports) $state fi run_iptables2 -A $chain $state $proto $ratelimit $multiport $cli $sports \ $(dest_ip_range $srv) $dports -m conntrack --ctorigdst $adr $user -j $target done fi else if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule_limit $loglevel $chain $logchain $logtarget "$ratelimit" "$logtag" -A $user \ $state $(fix_bang $proto $sports $multiport $cli $(dest_ip_range $srv) $dports) fi if [ -n "$nonat" ]; then addnatrule $(dnat_chain $source) $proto $multiport \ $cli $sports $(dest_ip_range $srv) $dports $ratelimit $user -j RETURN fi if [ "$logtarget" != NONAT ]; then run_iptables2 -A $chain $state $proto $multiport $cli $sports \ $(dest_ip_range $srv) $dports $ratelimit $user -j $target fi fi done done else if [ -n "$loglevel" -a -z "$natrule" ]; then log_rule_limit $loglevel $chain $logchain $logtarget "$ratelimit" "$logtag" -A $user \ $state $(fix_bang $proto $sports $multiport $cli $dports) fi [ -n "$nonat" ] && \ addnatrule $(dnat_chain $source) $proto $multiport \ $cli $sports $dports $ratelimit $user -j RETURN [ "$logtarget" != NONAT ] && \ run_iptables2 -A $chain $state $proto $multiport $cli $sports \ $dports $ratelimit $user -j $target fi fi else # Destination is a simple zone if [ -n "${excludesource}${excludedest}" ]; then handle_exclusion fi if [ -n "$addr" ]; then for adr in $(separate_list $addr); do if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain $logchain $logtarget "$ratelimit" "$logtag" -A $user \ $state $(fix_bang $proto $multiport $cli $dest_interface $sports $dports -m conntrack --ctorigdst $adr) fi if [ "$logtarget" != LOG ]; then if [ -n "$nonat" ]; then addnatrule $(dnat_chain $source) $proto $multiport \ $cli $sports $dports $ratelimit $user -m conntrack --ctorigdst $adr -j RETURN fi if [ "$logtarget" != NONAT ]; then run_iptables2 -A $chain $state $proto $multiport $cli $dest_interface \ $sports $dports $ratelimit $user -m conntrack --ctorigdst $adr -j $target fi fi done else if [ -n "$loglevel" ]; then log_rule_limit $loglevel $chain $logchain $logtarget "$ratelimit" "$logtag" -A $user \ $state $(fix_bang $proto $multiport $cli $dest_interface $sports $dports) fi if [ "$logtarget" != LOG ]; then if [ -n "$nonat" ]; then addnatrule $(dnat_chain $source) $proto $multiport \ $cli $sports $dports $ratelimit $user -j RETURN fi if [ "$logtarget" != NONAT ]; then run_iptables2 -A $chain $state $proto $multiport $cli $dest_interface \ $sports $dports $ratelimit $user -j $target fi fi fi fi } # # # # # F u n c t i o n B o d y # # # # # [ "x$ratelimit" = "x-" ] && ratelimit= if [ -n "$ratelimit" ]; then case $ratelimit in *:*) ratelimit="-m limit --limit ${ratelimit%:*} --limit-burst ${ratelimit#*:}" ;; *) ratelimit="-m limit --limit $ratelimit" ;; esac fi # Isolate log level if [ "$target" = "${target%:*}" ]; then loglevel= else loglevel="${target#*:}" target="${target%%:*}" expandv loglevel if [ "$loglevel" != "${loglevel%:*}" ]; then logtag="${loglevel#*:}" loglevel="${loglevel%:*}" expandv logtag fi case $loglevel in none*) loglevel= [ $target = LOG ] && return ;; esac loglevel=${loglevel%\!} fi # # Save the original target in 'logtarget' for logging rules # logtarget=${target%-} # # Targets ending in "-" only apply to the nat table # [ $target = $logtarget ] && dnat_only= || dnat_only=Yes # Tranform the rule: # # - parse the user specification # - set 'target' to the filter table target. # - make $FW the destination for REDIRECT # - remove '-' suffix from logtargets while setting 'dnat_only' # - clear 'address' if it has been set to '-' [ "x$userspec" = x- ] && userspec= [ "x$address" = "x-" ] && address= if [ -n "$userspec" ]; then userandgroup="-m owner" case "$userspec" in !*+*) if [ -n "${userspec#*+}" ]; then userandgroup="$userandgroup ! --cmd-owner ${userspec#*+}" fi userspec=${userspec%+*} ;; *+*) if [ -n "${userspec#*+}" ]; then userandgroup="$userandgroup --cmd-owner ${userspec#*+}" fi userspec=${userspec%+*} ;; esac case "$userspec" in !*:*) if [ "$userspec" != "!:" ]; then temp="${userspec#!}" temp="${temp%:*}" [ -n "$temp" ] && userandgroup="$userandgroup ! --uid-owner $temp" temp="${userspec#*:}" [ -n "$temp" ] && userandgroup="$userandgroup ! --gid-owner $temp" fi ;; *:*) if [ "$userspec" != ":" ]; then temp="${userspec%:*}" [ -n "$temp" ] && userandgroup="$userandgroup --uid-owner $temp" temp="${userspec#*:}" [ -n "$temp" ] && userandgroup="$userandgroup --gid-owner $temp" fi ;; !*) [ "$userspec" != "!" ] && userandgroup="$userandgroup ! --uid-owner ${userspec#!}" ;; *) [ -n "$userspec" ] && userandgroup="$userandgroup --uid-owner $userspec" ;; esac [ "$userandgroup" = "-m owner" ] && userandgroup= fi case $target in ACCEPT+|NONAT) [ $SECTION = NEW ] || fatal_error "$target rules are not allowed in the $SECTION SECTION" nonat=Yes target=ACCEPT ;; ACCEPT|LOG) ;; DROP) [ -n "$ratelimit" ] && fatal_error "Rate Limiting not available with DROP" ;; REJECT) target=reject ;; CONTINUE) target=RETURN ;; DNAT*|SAME*) [ $SECTION = NEW ] || fatal_error "$target rules are not allowed in the $SECTION SECTION" target=ACCEPT address=${address:=detect} ;; REDIRECT*) [ $SECTION = NEW ] || fatal_error "REDIRECT rules are not allowed in the $SECTION SECTION" target=ACCEPT address=${address:=all} if [ "x-" = "x$servers" ]; then servers=$FW else servers="$FW::$servers" fi ;; *-) [ $SECTION = NEW ] || fatal_error "$target rules are not allowed in the $SECTION SECTION" ;; esac # Parse and validate source if [ "$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 excludesource= case $clients in *!*!*) fatal_error "Invalid SOURCE in rule \"$rule\"" ;; !*) if [ $(list_count $clients) -gt 1 ]; then excludesource=${clients#!} clients= fi ;; *!*) excludesource=${clients#*!} clients=${clients%!*} ;; esac validate_zone $clientzone || fatal_error "Undefined Client Zone in rule \"$rule\"" # Parse and validate destination source=$clientzone if [ $source = $FW ]; then source_hosts= elif [ -n "$userspec" ]; then fatal_error "Invalid use of a user-qualification: rule \"$rule\"" else eval source_hosts=\"\$${source}_hosts\" fi 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\"" if [ $(list_count $servers) -gt 1 ]; then case $servers in !*) fatal_error "Exclude lists not supported in the DEST column" ;; esac fi else serverport= [ -z "$serverzone" -o -z "$servers" ] && \ fatal_error "Empty destination zone or qualifier: rule \"$rule\"" fi fi excludedest= case $servers in *!*!*) fatal_error "Invalid DEST in rule \"$rule\"" ;; !*) if [ $(list_count $servers) -gt 1 ]; then excludedest=${servers#*!} servers= fi ;; *!*) excludedest=${servers#*!} servers=${servers%!*} ;; esac 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} # If we have one or more exclusion lists, we will create a new chain and # store it's name in 'chain'. We still want log rules to reflect the # canonical chain so we store it's name in $logchain. logchain=$chain eval policy=\$${chain}_policy [ -z "$policy" ] && \ fatal_error "No policy defined from zone $source to zone $dest" [ $policy = NONE ] && \ fatal_error "Rules may not override a NONE policy: rule \"$rule\"" [ "x$protocol" = "x-" ] && protocol=all || protocol=${protocol:=all} ensurechain $chain # Generate Netfilter rule(s) case $logtarget in DNAT*|SAME) if [ -n "$XMULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ $(( $(list_count $ports) + $(list_count1 $(split $ports ) ) )) -le 16 -a \ $(( $(list_count $cports) + $(list_count1 $(split $cports ) ) )) -le 16 ] then # # Extended MULTIPORT is enabled, and less than # 16 ports are listed (port ranges count as two ports) - 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 elif [ -n "$MULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ "$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 "$XMULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ $(( $(list_count $ports) + $(list_count1 $(split $ports ) ) )) -le 16 -a \ $(( $(list_count $cports) + $(list_count1 $(split $cports ) ) )) -le 16 ] then # # Extended MULTIPORT is enabled, and less than # 16 ports are listed (port ranges count as two ports) - 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=${cports:=-} add_a_rule done done elif [ -n "$MULTIPORT" ] && \ ! list_search $protocol "icmp" "ICMP" "1" && \ [ "$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 ${cports:=-}); do add_a_rule done done done done fi ;; esac # # Report Result # progress_message " Rule \"$rule\" $DONE." save_progress_message_short " Rule \"$rule\" added." } # # Process a macro invocation in the rules file # process_macro() # $1 = target # $2 = param # $2 = clients # $3 = servers # $4 = protocol # $5 = ports # $6 = cports # $7 = address # $8 = ratelimit # $9 = userspec { local itarget="$1" local param="$2" local iclients="$3" local iservers="$4" local iprotocol="$5" local iports="$6" local icports="$7" local iaddress="$8" local iratelimit="$9" local iuserspec="${10}" progress_message "..Expanding Macro $(find_file macro.${itarget%%:*})..." while read mtarget mclients mservers mprotocol mports mcports mratelimit muserspec; do expandv mtarget mclients mservers mprotocol mports mcports mratelimit muserspec mtarget=$(merge_levels $itarget $mtarget) case $mtarget in PARAM|PARAM:*) [ -n "$param" ] && mtarget=$(substitute_action $param $mtarget) || fatal_error "PARAM requires that a parameter be supplied in macro invocation" ;; esac case ${mtarget%%:*} in ACCEPT|ACCEPT+|NONAT|DROP|REJECT|DNAT|DNAT-|REDIRECT|REDIRECT-|LOG|CONTINUE|QUEUE|SAME|SAME-) ;; *) if list_search ${mtarget%%:*} $ACTIONS; then if ! list_search $mtarget $USEDACTIONS; then createactionchain $mtarget USEDACTIONS="$USEDACTIONS $mtarget" fi mtarget=$(find_logactionchain $mtarget) else fatal_error "Invalid Action in rule \"$mtarget ${mclients:--} ${mservers:--} ${mprotocol:--} ${mports:--} ${mcports:--} ${xaddress:--} ${mratelimit:--} ${muserspec:--}\"" fi ;; esac if [ -n "$mclients" ]; then case $mclients in -|SOURCE) mclients=${iclients} ;; DEST) mclients=${iservers} ;; *) mclients=$(merge_macro_source_dest $mclients $iclients) ;; esac else mclients=${iclients} fi if [ -n "$mservers" ]; then case $mservers in -|DEST) mservers=${iservers} ;; SOURCE) mservers=${iclients} ;; *) mservers=$(merge_macro_source_dest $mservers $iservers) ;; esac else mservers=${iservers} fi [ -n "$iprotocol" ] && [ "x${iprotocol}" != x- ] && mprotocol=$iprotocol [ -n "$iports" ] && [ "x${iports}" != x- ] && mports=$iports [ -n "$icports" ] && [ "x${icports}" != x- ] && mcports=$icports [ -n "$iratelimit" ] && [ "x${iratelimit}" != x- ] && mratelimit=$iratelimit [ -n "$iuserspec" ] && [ "x${iuserspec}" != x- ] && muserspec=$iuserspec rule="$mtarget ${mclients=-} ${mservers:=-} ${mprotocol:=-} ${mports:=-} ${mcports:=-} ${xaddress:=-} ${mratelimit:=-} ${muserspec:=-}" process_rule $mtarget $mclients $mservers $mprotocol $mports $mcports ${iaddress:=-} $mratelimit $muserspec done < $TMP_DIR/macro.${itarget%%:*} progress_message "..End Macro" } # # Process the rules file # process_rules() { # # Process a rule where the source or destination is "all" # process_wildcard_rule() # $1 = Yes, if this is a macro, $2 = Yes if we want intrazone traffic { local yclients yservers ysourcezone ydestzone ypolicy for yclients in $xclients; do for yservers in $xservers; do ysourcezone=${yclients%%:*} ydestzone=${yservers%%:*} if [ "${ysourcezone}" != "${ydestzone}" -o "$2" = Yes ] ; then eval ypolicy=\$${ysourcezone}2${ydestzone}_policy if [ "$ypolicy" != NONE ] ; then if [ "$1" = Yes ]; then process_macro $xtarget "$xparam" $yclients $yservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec else rule="$xtarget $yclients $yservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec" process_rule $xtarget $yclients $yservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec fi fi fi done done } do_it() # $1 = "Yes" if the target is a macro. { expandv xprotocol xports xcports xaddress xratelimit xuserspec intrazone= if [ -z "$SECTIONS" ]; then finish_section ESTABLISHED,RELATED SECTIONS="ESTABLISHED RELATED NEW" SECTION=NEW fi case $xclients in all+) xclients=all intrazone=Yes ;; all+-|all-+) xclients=all- intrazone=Yes ;; esac case $xservers in all+) xservers=all intrazone=Yes ;; all+-|all-+) xservers=all- intrazone=Yes ;; esac case $xclients in all|all-) [ $xclients = all ] && xclients="$ZONES $FW" || xclients="$ZONES" if [ "x$xservers" = xall ]; then xservers="$ZONES $FW" elif [ "x$xservers" = xall- ]; then xservers="$ZONES" fi process_wildcard_rule "$1" $intrazone return ;; esac case $xservers in all|all-) xservers="$ZONES $FW" process_wildcard_rule "$1" $intrazone return ;; esac if [ "$1" = Yes ]; then process_macro $xtarget "$xparam" $xclients $xservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec else rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec" process_rule $xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec fi } while read xtarget xclients xservers xprotocol xports xcports xaddress xratelimit xuserspec; do expandv xtarget xclients xservers if [ "x$xclients" = xnone -o "x$servers" = xnone ]; then rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec" progress_message " Rule \"$rule\" ignored." continue fi case "${xtarget%%:*}" in ACCEPT|ACCEPT+|NONAT|DROP|REJECT|DNAT|DNAT-|REDIRECT|REDIRECT-|LOG|CONTINUE|QUEUE|SAME|SAME-) do_it No ;; SECTION) list_search $xclients $SECTIONS && fatal_error "Duplicate or out of order SECTION $xclients" case $xclients in ESTABLISHED) SECTIONS=ESTABLISHED ;; RELATED) finish_section ESTABLISHED SECTIONS="ESTABLISHED RELATED" ;; NEW) [ $SECTION = RELATED ] && finish_section RELATED || finish_section ESTABLISHED,RELATED SECTIONS="ESTABLISHED RELATED NEW" ;; *) fatal_error "Invalid SECTION $xclients" ;; esac [ -n "$xservers" ] && fatal_error "Invalid SECTION $xclients $xservers" SECTION=$xclients ;; *) if list_search ${xtarget%%:*} $ACTIONS; then if ! list_search $xtarget $USEDACTIONS; then createactionchain $xtarget USEDACTIONS="$USEDACTIONS $xtarget" fi xtarget=$(find_logactionchain $xtarget) do_it No else xtarget1=$(map_old_action ${xtarget%%:*}) case $xtarget1 in */*) xparam=${xtarget1#*/} xtarget1=${xtarget1%%/*} xtarget=$(substitute_action $xtarget1 $xtarget) ;; *) xparam= ;; esac f=macro.$xtarget1 if [ -f $TMP_DIR/$f ]; then do_it Yes else fn=$(find_file $f) if [ -f $fn ]; then strip_file $f $fn do_it Yes else rule="$xtarget $xclients $xservers $xprotocol $xports $xcports $xaddress $xratelimit $xuserspec" fatal_error "Invalid Action in rule \"$rule\"" fi fi fi ;; esac done < $TMP_DIR/rules case $SECTION in ESTABLISHED) finish_section ESTABLISHED,RELATED ;; RELATED) finish_section RELATED ;; esac SECTION=DONE } # # Process a record from the tos file # # The caller has loaded the column contents from the record into the following # variables: # # src dst protocol sport dport tos # # and has loaded a space-separated list of their values in "rule". # process_tos_rule() { # # Parse the contents of the 'src' variable # if [ "$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 networks # src="$(source_ip_range $src)" ;; ~*|!~*) src=$(mac_match $src) ;; *) # # Assume that this is a device name # if ! verify_interface $src ; then error_message "WARNING: Unknown Interface in rule \"$rule\" ignored" return fi src="$(match_source_dev $src)" ;; esac # # Parse the contents of the 'dst' variable # if [ "$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 networks # ;; *) # # 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 $dst; do dest="$(dest_ip_range $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 $tos done fi ;; esac done progress_message " Rule \"$rule\" $DONE." save_progress_message "Rule \"$rule\" Added." } # # Process the tos file # process_tos() # $1 = name of tos file { progress_message2 "$DOING $1..." strip_file tos $1 if [ -s $TMP_DIR/tos ] ; then createmanglechain pretos createmanglechain outtos while read src dst protocol sport dport tos; do expandv src dst protocol sport dport tos rule="$(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 fi } # # Display elements of a list with leading white space # display_list() # $1 = List Title, rest of $* = list to display { [ $# -gt 1 ] && echo " $*" } policy_rules() # $1 = chain to add rules to # $2 = policy # $3 = loglevel { local target="$2" case "$target" in ACCEPT) [ -n "$ACCEPT_common" ] && run_iptables -A $1 -j $ACCEPT_common ;; DROP) [ -n "$DROP_common" ] && run_iptables -A $1 -j $DROP_common ;; REJECT) [ -n "$REJECT_common" ] && run_iptables -A $1 -j $REJECT_common target=reject ;; QUEUE) [ -n "$QUEUE_common" ] && run_iptables -A $1 -j $QUEUE_common ;; CONTINUE) target= ;; *) fatal_error "Invalid policy ($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 } report_syn_flood_protection() { progress_message " Enabled SYN flood protection" } 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 $policy in ACCEPT|QUEUE) if [ -n "$synparams" ]; then # # To avoid double-counting SYN packets, enforce the policy # in this chain. # report_syn_flood_protection 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" ] && \ report_syn_flood_protection policy_rules $chain $policy $loglevel ;; *) # # DROP or REJECT policy -- enforce in the policy chain and # enable SYN flood protection if requested. # [ -n "$synparams" ] && \ report_syn_flood_protection jump_to_policy_chain ;; esac fi progress_message " 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 eval 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} local policy havechain $chain && { echo $chain; return; } [ "$1" = "$2" ] && { echo ACCEPT; return; } eval chain=\$${chain}_policychain eval policy=\$${chain}_policy if [ "$policy" != CONTINUE ] ; then [ -n "$chain" ] && { echo $chain; return; } fatal_error "No policy defined for zone $1 to zone $2" fi } # # Set up Routing # setup_routes() { local mask=0xFF mark_op="--set-mark" [ -n "$HIGH_ROUTE_MARKS" ] && mask=0xFF00 && mark_op="--or-mark" run_iptables -t mangle -A PREROUTING -m connmark ! --mark 0/$mask -j CONNMARK --restore-mark --mask $mask run_iptables -t mangle -A OUTPUT -m connmark ! --mark 0/$mask -j CONNMARK --restore-mark --mask $mask createmanglechain routemark for interface in $ROUTEMARK_INTERFACES ; do iface=$(chain_base $interface) eval mark_value=\$${iface}_routemark run_iptables -t mangle -A PREROUTING -i $interface -m mark --mark 0/$mask -j routemark run_iptables -t mangle -A routemark -i $interface -j MARK $mark_op $mark_value done run_iptables -t mangle -A routemark -m mark ! --mark 0/$mask -j CONNMARK --save-mark --mask $mask } # # Set up Source NAT (including masquerading) # setup_masq() { do_ipsec_options() { local options="$(separate_list $ipsec)" option policy="-m policy --pol ipsec --dir out" for option in $options; do case $option in [Yy]es) ;; strict) policy="$policy --strict" ;; next) policy="$policy --next" ;; reqid=*) policy="$policy --reqid ${option#*=}" ;; spi=*) policy="$policy --spi ${option#*=}" ;; proto=*) policy="$policy --proto ${option#*=}" ;; mode=*) policy="$policy --mode ${option#*=}" ;; tunnel-src=*) policy="$policy --tunnel-src ${option#*=}" ;; tunnel-dst=*) policy="$policy --tunnel-dst ${option#*=}" ;; reqid!=*) policy="$policy ! --reqid ${option#*=}" ;; spi!=*) policy="$policy ! --spi ${option#*=}" ;; proto!=*) policy="$policy ! --proto ${option#*=}" ;; mode!=*) policy="$policy ! --mode ${option#*=}" ;; tunnel-src!=*) policy="$policy ! --tunnel-src ${option#*=}" ;; tunnel-dst!=*) policy="$policy ! --tunnel-dst ${option#*=}" ;; *) fatal_error "Invalid IPSEC option \"$option\"" ;; esac done } setup_one() { local add_snat_aliases=$ADD_SNAT_ALIASES pre_nat= policy= destnets= [ "x$ipsec" = x- ] && ipsec= case $ipsec in Yes|yes) [ -n "$POLICY_MATCH" ] || \ fatal_error "IPSEC=Yes requires policy match support in your kernel and iptables" policy="-m policy --pol ipsec --dir out" ;; No|no) [ -n "$POLICY_MATCH" ] || \ fatal_error "IPSEC=No requires policy match support in your kernel and iptables" policy="-m policy --pol none --dir out" ;; *) if [ -n "$ipsec" ]; then do_ipsec_options elif [ -n "$POLICY_MATCH" ]; then policy="-m policy --pol none --dir out" fi ;; esac case $fullinterface in +*) pre_nat=Yes fullinterface=${fullinterface#+} ;; esac case $fullinterface in *::*) add_snat_aliases= destnets="${fullinterface##*:}" fullinterface="${fullinterface%:*}" ;; *:*:*) # Both alias name and networks destnets="${fullinterface##*:}" fullinterface="${fullinterface%:*}" ;; *:) add_snat_aliases= fullinterface=${fullinterface%:} ;; *:*) # Alias name OR networks case ${fullinterface#*:} in *.*) # It's a networks destnets="${fullinterface#*:}" fullinterface="${fullinterface%:*}" ;; *) #it's an alias name ;; esac ;; *) ;; esac interface=${fullinterface%:*} if ! list_search $interface $ALL_INTERFACES; then fatal_error "Unknown interface $interface" fi if [ "$networks" = "${networks%!*}" ]; then nomasq= else nomasq="${networks#*!}" networks="${networks%!*}" fi source="${networks:=0.0.0.0/0}" detectinterface= case $source in *.*.*|+*|!+*) ;; *) detectinterface=$networks networks= ;; esac [ "x$proto" = x- ] && proto= [ "x$ports" = x- ] && ports= if [ -n "$proto" ]; then displayproto="($proto)" case $proto in tcp|TCP|udp|UDP|6|17) if [ -n "$ports" ]; then displayproto="($proto $ports)" listcount=$(list_count $ports) if [ $listcount -gt 1 ]; then case $ports in *:*) if [ -n "$XMULTIPORT" ]; then if [ $(($listcount + $(list_count1 $(split $ports) ) )) -le 16 ]; then ports="-m multiport --dports $ports" else fatal_error "More than 15 entries in port list ($ports)" fi else fatal_error "Port Range not allowed in list ($ports)" fi ;; *) if [ -n "$MULTIPORT" ]; then [ $listcount -le 15 ] || fatal_error "More than 15 entries in port list ($ports)" ports="-m multiport --dports $ports" else fatal_error "Port Ranges require multiport match support in your kernel ($ports)" fi ;; esac else ports="--dport $ports" fi fi ;; *) [ -n "$ports" ] && fatal_error "Ports only allowed with UDP or TCP ($ports)" ;; esac proto="-p $proto" else displayproto="(all)" [ -n "$ports" ] && fatal_error "Ports only allowed with UDP or TCP ($ports)" fi destination=${destnets:=0.0.0.0/0} [ -z "$pre_nat" ] && chain=$(masq_chain $interface) || chain=$(snat_chain $interface) ensurenatchain $chain case $destnets in !*) destnets=${destnets#!} build_exclusion_chain newchain nat "$nomasq" "$destnets" if [ -n "$networks" ]; then for s in $networks; do addnatrule $chain $(source_ip_range $s) $proto $ports $policy -j $newchain done networks= elif [ -n "$detectinterface" ]; then indent >&3 << __EOF__ networks="\$(get_routed_networks $detectinterface)" [ -z "\$networks" ] && fatal_error "Unable to determine the routes through interface \"$detectinterface\"" for network in \$networks; do run_iptables -t nat -A $chain -s \$network $proto $ports $policy -j $newchain done __EOF__ else addnatrule $chain -j $newchain fi chain=$newchain destnets=0.0.0.0/0 proto= ports= policy= [ -n "$nomasq" ] && source="$source except $nomasq" ;; *) if [ -n "$nomasq" ]; then build_exclusion_chain newchain nat $nomasq if [ -n "$networks" ]; then for s in $networks; do for destnet in $(separate_list $destnets); do addnatrule $chain $(both_ip_ranges $s $destnet) $proto $ports $policy -j $newchain done done elif [ -n "$detectinterface" ]; then indent >&3 << __EOF__ networks="\$(get_routed_networks $detectinterface)" [ -z "\$networks" ] && fatal_error "Unable to determine the routes through interface \"$detectinterface\"" for network in \$networks; do __EOF__ for destnet in $(separate_list $destnets); do indent >&3 << __EOF__ run_iptables -t nat -A $chain -s \$network $(dest_ip_range $destnet) $proto $sports $policy -j $netchain __EOF__ done indent >&3 << __EOF__ done __EOF__ else for destnet in $(separate_list $destnets); do addnatrule $chain $(dest_ip_range $destnet) $proto $ports $policy -j $newchain done fi chain=$newchain networks= destnets=0.0.0.0/0 proto= ports= policy= source="$source except $nomasq" fi ;; esac addrlist= target=MASQUERADE [ "x$addresses" = x- ] && addresses= if [ -n "$addresses" ]; then case "$addresses" in SAME:nodst:*) target="SAME --nodst" addresses=${addresses#SAME:nodst:} if [ "$addresses" = detect ]; then addrlist='$addrlist' else for address in $(separate_list $addresses); do addrlist="$addrlist --to $address"; done fi ;; SAME:*) target="SAME" addresses=${addresses#SAME:} if [ "$addresses" = detect ]; then addrlist='$addrlist' else for address in $(separate_list $addresses); do addrlist="$addrlist --to $address"; done fi ;; detect) target=SNAT addrlist='$addrlist' ;; *) for address in $(separate_list $addresses); do case $address in *.*.*.*) target=SNAT addrlist="$addrlist --to-source $address" ;; *) addrlist="$addrlist --to-ports ${address#:}" ;; esac done ;; esac if [ "$addrlist" = '$addrlist' ]; then addresses='$(combine_list $addresses)' indent >&3 << __EOF__ addrlist= addressses=\$(find_interface_addresses $interface) if [ -n "\$addresses" ]; then for address in \$addresses; do addrlist="$addrlist --to-source $address" done else fatal_error "Unable to determine the IP address(es) of $interface" fi __EOF__ elif [ -n "$add_snat_aliases" ]; then for address in $(separate_list $addresses); do address=${address%:)} if [ -n "$address" ]; then for addr in $(ip_range_explicit ${address%:*}) ; do if ! list_search $addr $ALIASES_TO_ADD; then [ -n "$RETAIN_ALIASES" ] || save_command ip_addr_del $addr $interface ALIASES_TO_ADD="$ALIASES_TO_ADD $addr $fullinterface" case $fullinterface in *:*) fullinterface=${fullinterface%:*}:$((${fullinterface#*:} + 1 )) ;; esac fi done fi done fi fi if [ -n "$networks" ]; then for network in $networks; do for destnet in $(separate_list $destnets); do addnatrule $chain $(both_ip_ranges $network $destnet) $proto $ports $policy -j $target $addrlist done if [ -n "$addresses" ]; then progress_message_and_save " To $destination $displayproto from $network through ${interface} using $addresses" else progress_message_and_save " To $destination $displayproto from $network through ${interface}" fi done elif [ -n "$detectinterface" ]; then indent >&3 << __EOF__ networks="\$(get_routed_networks $detectinterface)" [ -z "\$networks" ] && fatal_error "Unable to determine the routes through interface \"$detectinterface\"" for network in \$networks; do __EOF__ for destnet in $(separate_list $destnets); do indent >&3 << __EOF__ run_iptables -t nat -A $chain -s \$network $(dest_ip_range $destnet) $proto $ports $policy -j $target $addrlist __EOF__ done if [ -n "$addresses" ]; then message=" To $destination $displayproto from \$network through ${interface} using $addresses" else message=" To $destination $displayproto from \$network through ${interface}" fi indent >&3 << __EOF__ progress_message "$message" done __EOF__ else for destnet in $(separate_list $destnets); do addnatrule $chain $(dest_ip_range $destnet) $proto $ports $policy -j $target $addrlist done if [ -n "$addresses" ]; then progress_message_and_save " To $destination $displayproto from $source through ${interface} using $addresses" else progress_message_and_save " To $destination $displayproto from $source through ${interface}" fi fi } strip_file masq $1 if [ -n "$NAT_ENABLED" ]; then progress_message2 "$DOING Masquerading/SNAT" save_progress_message "Setting up Masquerading/SNAT..." fi while read fullinterface networks addresses proto ports ipsec; do expandv fullinterface networks addresses proto ports ipsec if [ -n "$NAT_ENABLED" ]; then setup_one else error_message "WARNING: NAT disabled; masq rule ignored" fi 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 # # $networks = address/networks # $protocol = Protocol Number/Name # $port = Port Number/Name # process_blacklist_rec() { local source local addr local proto local dport local temp local setname for addr in $(separate_list $networks); do case $addr in -) source= ;; ~*|!~*) addr=$(echo $addr | sed 's/~//;s/-/:/g') source="--match mac --mac-source $addr" ;; *) source="$(source_ip_range $addr)" ;; esac if [ -n "$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 progress_message_and_save " $addr added to Black List" done } # # Setup the Black List # setup_blacklist() { local hosts="$(find_hosts_by_option blacklist)" local f=$(find_file blacklist) local disposition=$BLACKLIST_DISPOSITION local ipsec policy if [ -n "$hosts" -a -f $f ]; then progress_message2 "$DOING Blacklisting..." strip_file blacklist $f createchain blacklst no [ -n "$BLACKLISTNEWONLY" ] && state="-m state --state NEW,INVALID" || state= for host in $hosts; do ipsec=${host%^*} host=${host#*^} [ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy= interface=${host%%:*} network=${host#*:} for chain in $(first_chains $interface); do run_iptables -A $chain $state $(match_source_hosts $network) $policy -j blacklst done [ $network = 0/0.0.0.0 ] && network= || network=":$network" progress_message_and_save " Blacklisting enabled on ${interface}${network}" done [ "$disposition" = REJECT ] && disposition=reject if [ -z "$DELAYBLACKLISTLOAD" ]; then while read networks protocol ports; do expandv networks protocol ports process_blacklist_rec done < $TMP_DIR/blacklist fi fi } # # Refresh the Black List # refresh_blacklist() { local f=$(find_file blacklist) local disposition=$BLACKLIST_DISPOSITION progress_message2 "$DOING Black List..." save_progress_message "Loading Black List..." strip_file blacklist $f [ "$disposition" = REJECT ] && disposition=reject run_iptables -F blacklst while read networks protocol ports; do expandv networks protocol ports process_blacklist_rec done < $TMP_DIR/blacklist } # # Verify the Black List # validate_blacklist() { local f=$(find_file blacklist) local disposition=$BLACKLIST_DISPOSITION progress_message2 "Checking Black List..." strip_file blacklist $f [ "$disposition" = REJECT ] && disposition=reject while read networks protocol ports; do expandv networks protocol ports process_blacklist_rec done < $TMP_DIR/blacklist } # # 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 () { setup_mss() { case $CLAMPMSS in Yes) option="--clamp-mss-to-pmtu" ;; *) option="--set-mss $CLAMPMSS" ;; esac run_iptables -A FORWARD -p tcp --tcp-flags SYN,RST SYN -j TCPMSS $option } report_capabilities if [ -n "$BRIDGING" ]; then [ -n "$PHYSDEV_MATCH" ] || fatal_error "BRIDGING=Yes requires Physdev Match support in your Kernel and iptables" fi [ "$MACLIST_TTL" = "0" ] && MACLIST_TTL= if [ -n "$MACLIST_TTL" -a -z "$RECENT_MATCH" ]; then fatal_error "MACLIST_TTL requires the Recent Match capability which is not present in your Kernel and/or iptables" fi [ -n "$RFC1918_STRICT" -a -z "$CONNTRACK_MATCH" ] && \ fatal_error "RFC1918_STRICT=Yes requires Connection Tracking match" progress_message2 "Determining Zones..." determine_zones if [ $VERBOSE -ge 1 ]; then display_list "IPv4 Zones:" $IPV4_ZONES [ -n "$IPSEC_ZONES" ] && \ display_list "IPSEC Zones:" $IPSEC_ZONES display_list "Firewall Zone:" $FW fi progress_message2 "Validating interfaces file..." validate_interfaces_file progress_message2 "Validating hosts file..." validate_hosts_file progress_message2 "Validating Policy file..." validate_policy progress_message2 "Determining Hosts in Zones..." determine_interfaces determine_hosts append_file init # # Some files might be large so strip them while the firewall is still running # (restart command). This reduces the length of time that the firewall isn't # accepting new connections. # strip_file rules strip_file proxyarp strip_file maclist strip_file nat strip_file netmap progress_message2 "Pre-processing Actions..." process_actions1 TERMINATOR=fatal_error deletechain shorewall if [ -n "$NAT_ENABLED" ]; then delete_nat for chain in PREROUTING POSTROUTING OUTPUT; do qt_iptables -t nat -P $chain ACCEPT done fi delete_proxy_arp if [ -n "$MANGLE_ENABLED" ]; then run_iptables -t mangle -F run_iptables -t mangle -X for chain in PREROUTING INPUT FORWARD POSTROUTING; do qt_iptables -t mangle -P $chain ACCEPT done fi if [ -n "$RAW_TABLE" ]; then run_iptables -t raw -F run_iptables -t raw -X for chain in PREROUTING OUTPUT; do qt_iptables -t raw -P $chain ACCEPT done fi [ -n "$CLEAR_TC" ] && delete_tc progress_message2 "Deleting user chains..." save_progress_message "Deleting user chains..." exists_INPUT=Yes exists_OUTPUT=Yes exists_FORWARD=Yes process_criticalhosts if [ -n "$CRITICALHOSTS" ]; then setpolicy INPUT ACCEPT setpolicy OUTPUT ACCEPT setpolicy FORWARD DROP deleteallchains enable_critical_hosts setpolicy INPUT DROP setpolicy OUTPUT DROP [ -n "$CLAMPMSS" ] && setup_mss setcontinue FORWARD setcontinue INPUT setcontinue OUTPUT else setpolicy INPUT DROP setpolicy OUTPUT DROP setpolicy FORWARD DROP deleteallchains [ -n "$CLAMPMSS" ] && setup_mss setcontinue FORWARD setcontinue INPUT setcontinue OUTPUT fi f=$(find_file ipsets) if [ -f $f ]; then progress_message2 "Processing $f ..." save_progress_message "Restoring IPSETS..." save_command "ipset -U :all: :all:" save_command "ipset -F" save_command "ipset -X" save_command "ipset -R < $f" fi append_file continue f=$(find_file routestopped) progress_message2 "$DOING $f ..." strip_file routestopped $f process_routestopped -A if [ -n "$DISABLE_IPV6" ]; then save_command disable_ipv6 fi save_progress_message "Enabling Loopback and DNS Lookups" # # Enable the Loopback interface for now # run_iptables -A INPUT -i lo -j ACCEPT run_iptables -A OUTPUT -o lo -j ACCEPT # # Allow DNS lookups during startup for FQDNs # for chain in INPUT OUTPUT FORWARD; do run_iptables -A $chain -p udp --dport 53 -j ACCEPT done accounting_file=$(find_file accounting) [ -f $accounting_file ] && setup_accounting $accounting_file createchain reject no createchain dynamic no createchain logdrop no createchain logreject no createchain smurfs no log_rule ${BLACKLIST_LOGLEVEL:-info} logdrop DROP log_rule ${BLACKLIST_LOGLEVEL:-info} logreject REJECT run_iptables -A logdrop -j DROP run_iptables -A logreject -j reject indent >&3 << __EOF__ if [ -f \${VARDIR}/save ]; then progress_message2 "Setting up dynamic rules..." while read target ignore1 ignore2 address rest; do case \$target in DROP|reject|logdrop|logreject) run_iptables -A dynamic -s \$address -j \$target ;; esac done < \${VARDIR}/save fi __EOF__ [ -n "$BLACKLISTNEWONLY" ] && state="-m state --state NEW,INVALID" || state= progress_message2 "Creating Interface Chains..." save_progress_message "Creating Interface Chains..." for interface in $ALL_INTERFACES; do for chain in $(input_chain $interface) $(forward_chain $interface); do createchain $chain no run_iptables -A $chain $state -j dynamic done done } # # Construct zone-independent rules # add_common_rules() { local savelogparms="$LOGPARMS" local broadcasts="$(find_broadcasts) 255.255.255.255 224.0.0.0/4" drop_broadcasts() { for interface in $(find_bcastdetect_interfaces); do indent >&3 << __EOF__ ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u | while read address; do run_iptables -A reject -d \$address -j DROP done __EOF__ done for address in $broadcasts ; do run_iptables -A reject -d $address -j DROP done } # # Populate the smurf chain # save_progress_message "Setting up SMURF control..." for interface in $(find_bcastdetect_interfaces); do indent >&3 << __EOF__ ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u | while read address; do __EOF__ [ -n "$SMURF_LOG_LEVEL" ] && \ indent >&3 << __EOF__ log_rule $SMURF_LOG_LEVEL smurfs DROP -s \$address __EOF__ indent >&3 << __EOF__ run_iptables -A smurfs -s \$address -j DROP done __EOF__ done for address in $broadcasts ; do [ -n "$SMURF_LOG_LEVEL" ] && log_rule $SMURF_LOG_LEVEL smurfs DROP -s $address run_iptables -A smurfs $(source_ip_range $address) -j DROP run_iptables -A reject -s $address -j DROP done # # Reject Rules -- Don't respond to broadcasts with an ICMP # if [ -n "$USEPKTTYPE" ]; then run_iptables -A reject -m pkttype --pkt-type broadcast -j DROP run_iptables -A reject -m pkttype --pkt-type multicast -j DROP else drop_broadcasts fi # # Don't feed the smurfs # for address in $broadcasts ; do run_iptables -A reject -s $address -j DROP done run_iptables -A reject -p tcp -j REJECT --reject-with tcp-reset run_iptables -A reject -p udp -j REJECT # # Not all versions of iptables support these so don't complain if they don't work # if [ -n "$ENHANCED_REJECT" ]; then run_iptables -A reject -p icmp -j REJECT --reject-with icmp-host-unreachable run_iptables -A reject -j REJECT --reject-with icmp-host-prohibited else run_iptables -A reject -j REJECT fi # # Create common action chains # for action in $USEDACTIONS; do createactionchain $action done append_file initdone # # Process Black List # save_progress_message "Setting up Black List..." setup_blacklist # # SMURFS # hosts=$(find_hosts_by_option nosmurfs) if [ -n "$hosts" ]; then progress_message2 "Adding Anti-smurf Rules" save_progress_message "Adding Anti-smurf Jumps..." for host in $hosts; do ipsec=${host%^*} host=${host#*^} [ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy= interface=${host%%:*} network=${host#*:} for chain in $(first_chains $interface); do run_iptables -A $chain -m state --state NEW,INVALID $(match_source_hosts $network) $policy -j smurfs done done fi # # DHCP # interfaces=$(find_interfaces_by_option dhcp) if [ -n "$interfaces" ]; then progress_message2 "Adding rules for DHCP" save_progress_message "Setting up rules for DHCP..." for interface in $interfaces; do if [ -n "$BRIDGING" ]; then is_bridge=$( brctl show $interface 2> /dev/null | grep ^$interface[[:space:]] ) [ -n "$is_bridge" ] && \ do_iptables -A $(forward_chain $interface) -p udp -o $interface --dport 67:68 -j ACCEPT fi run_iptables -A $(input_chain $interface) -p udp --dport 67:68 -j ACCEPT run_iptables -A OUTPUT -o $interface -p udp --dport 67:68 -j ACCEPT done fi # # RFC 1918 # hosts="$(find_hosts_by_option norfc1918)" if [ -n "$hosts" ]; then progress_message2 "Enabling RFC1918 Filtering" save_progress_message "Setting up RFC1918 Filtering..." strip_file rfc1918 createchain norfc1918 no createchain rfc1918 no log_rule $RFC1918_LOG_LEVEL rfc1918 DROP run_iptables -A rfc1918 -j DROP chain=norfc1918 if [ -n "$RFC1918_STRICT" ]; then # # We'll generate two chains - one for source and one for destination # chain=rfc1918d createchain $chain no elif [ -n "$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 # createmanglechain man1918 createmanglechain rfc1918 log_rule $RFC1918_LOG_LEVEL rfc1918 DROP -t mangle run_iptables -t mangle -A rfc1918 -j DROP fi while read networks target; do case $target in logdrop) target=rfc1918 s_target=rfc1918 ;; DROP) s_target=DROP ;; RETURN) [ -n "$RFC1918_STRICT" ] && s_target=rfc1918d || s_target=RETURN ;; *) fatal_error "Invalid target ($target) for $networks" ;; esac for network in $(separate_list $networks); do run_iptables2 -A norfc1918 $(source_ip_range $network) -j $s_target if [ -n "$CONNTRACK_MATCH" ]; then # # We have connection tracking match -- match on the original destination # run_iptables2 -A $chain -m conntrack --ctorigdst $network -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 $(dest_ip_range $network) -j $target fi done done < $TMP_DIR/rfc1918 [ -n "$RFC1918_STRICT" ] && run_iptables -A norfc1918 -j rfc1918d for host in $hosts; do ipsec=${host%^*} host=${host#*^} [ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy= interface=${host%%:*} networks=${host#*:} for chain in $(first_chains $interface); do run_iptables -A $chain -m state --state NEW $(match_source_hosts $networks) $policy -j norfc1918 done [ -n "$MANGLE_ENABLED" -a -z "$CONNTRACK_MATCH" ] && \ run_iptables -t mangle -A PREROUTING -m state --state NEW -i $interface $(match_source_hosts $networks) -j man1918 done fi hosts=$(find_hosts_by_option tcpflags) if [ -n "$hosts" ]; then progress_message2 "$DOING TCP Flags checking..." save_progress_message "Setting up TCP Flags checking..." createchain tcpflags no if [ -n "$TCP_FLAGS_LOG_LEVEL" ]; then createchain logflags no savelogparms="$LOGPARMS" [ "$TCP_FLAGS_LOG_LEVEL" = ULOG ] || LOGPARMS="$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 host in $hosts; do ipsec=${host%^*} host=${host#*^} [ -n "$POLICY_MATCH" ] && policy="-m policy --pol $ipsec --dir in" || policy= interface=${host%%:*} network=${host#*:} for chain in $(first_chains $interface); do run_iptables -A $chain -p tcp $(match_source_hosts $network) $policy -j tcpflags done done fi # # ARP Filtering # save_progress_message "Setting up ARP filtering..." indent >&3 << __EOF__ for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/arp_filter ] && echo 0 > \$f/arp_filter [ -f \$f/arp_ignore ] && echo 0 > \$f/arp_ignore done __EOF__ interfaces=$(find_interfaces_by_option arp_filter) interfaces1=$(find_interfaces_by_option1 arp_ignore) if [ -n "${interfaces}${interfaces1}" ]; then progress_message2 "$DOING ARP Filtering..." for interface in $interfaces; do file=/proc/sys/net/ipv4/conf/$interface/arp_filter indent >&3 << __EOF__ if [ -f $file ]; then echo 1 > $file else error_message "WARNING: Cannot set ARP filtering on $interface" fi __EOF__ done for interface in $interfaces1; do file=/proc/sys/net/ipv4/conf/$interface/arp_ignore eval value="\$$(chain_base $interface)_arp_ignore" indent >&3 << __EOF__ if [ -f $file ]; then echo $value > $file else error_message "WARNING: Cannot set ARP filtering on $interface" fi __EOF__ done fi # # Route Filtering # interfaces="$(find_interfaces_by_option routefilter)" if [ -n "$interfaces" -o -n "$ROUTE_FILTER" ]; then progress_message2 "$DOING Kernel Route Filtering..." save_progress_message "Setting up Route Filtering..." indent >&3 << __EOF__ for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/log_martians ] && echo 0 > \$f/rp_filter done __EOF__ for interface in $interfaces; do file=/proc/sys/net/ipv4/conf/$interface/rp_filter indent >&3 << __EOF__ if [ -f $file ]; then echo 1 > $file else error_message "WARNING: Cannot set route filtering on $interface" fi __EOF__ done save_command "echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter" if [ -n "$ROUTE_FILTER" ]; then save_command "echo 1 > /proc/sys/net/ipv4/conf/default/rp_filter" save_command "echo 1 > /proc/sys/net/ipv4/conf/all/rp_filter" fi save_command "[ -n \"\$NOROUTES\" ] || ip route flush cache" fi # # Martian Logging # interfaces="$(find_interfaces_by_option logmartians)" if [ -n "$interfaces" -o -n "$LOG_MARTIANS" ]; then progress_message2 "$DOING Martian Logging..." save_progress_message "Setting up Martian Logging..." indent >&3 << __EOF__ for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/log_martians ] && echo 0 > \$f/log_martians done __EOF__ for interface in $interfaces; do file=/proc/sys/net/ipv4/conf/$interface/log_martians indent >&3 << __EOF__ if [ -f $file ]; then echo 1 > $file else error_message "WARNING: Cannot set Martian logging on $interface" fi __EOF__ done if [ -n "$LOG_MARTIANS" ]; then save_command "echo 1 > /proc/sys/net/ipv4/conf/default/log_martians" save_command "echo 1 > /proc/sys/net/ipv4/conf/all/log_martians" fi fi # # Source Routing # save_progress_message "Setting up Accept Source Routing..." indent >&3 << __EOF__ for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/accept_source_route ] && echo 0 > \$f/accept_source_route done __EOF__ interfaces=$(find_interfaces_by_option sourceroute) if [ -n "$interfaces" ]; then progress_message2 "$DOING Accept Source Routing..." save_progress_message "Setting up Source Routing..." for interface in $interfaces; do file=/proc/sys/net/ipv4/conf/$interface/accept_source_route indent >&3 << __EOF__ if [ -f $file ]; then echo 1 > $file else error_message "WARNING: Cannot set Accept Source Routing on $interface" fi __EOF__ done fi # # UPnP # interfaces=$(find_interfaces_by_option upnp) if [ -n "$interfaces" ]; then progress_message2 "$DOING UPnP..." save_progress_message "Setting up UPnP..." createnatchain UPnP for interface in $interfaces; do run_iptables -t nat -A PREROUTING -i $interface -j UPnP done fi setup_forwarding } # # 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 optional=\$${chain}_is_optional if [ "$policy" != NONE ]; then if ! havechain $chain && [ -z "$optional" -a "$policy" != CONTINUE ]; then # # The chain doesn't exist. Create the chain and add policy # rules # 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) run_user_exit $chain policy_rules $chain $policy $loglevel ;; esac fi 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 if havenatchain $destchain ; then run_iptables2 -t nat -A $sourcechain $@ -j $destchain elif [ -z "$KLUDGEFREE" ]; then [ -n "$BRIDGING" -a -f $TMP_DIR/physdev ] && -rm -f $TMP_DIR/physdev [ -n "$IPRANGE_MATCH" -a -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange fi } # # Jump to a RULES chain from one of the builtin nat chains. These jumps are # are inserted before jumps to one-to-one NAT chains. # addrulejump() # $1 = BUILTIN chain, $2 = user chain, $3 - * other arguments { local sourcechain=$1 destchain=$2 shift shift if havenatchain $destchain; then eval run_iptables2 -t nat -I $sourcechain \ \$${sourcechain}_rule $@ -j $destchain eval ${sourcechain}_rule=\$\(\(\$${sourcechain}_rule + 1\)\) elif [ -z "$KLUDGEFREE" ]; then [ -n "$BRIDGING" -a -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev [ -n "$IPRANGE_MATCH" -a -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange fi } # # Create a dynamic chain for a zone and jump to it from a second chain # create_zone_dyn_chain() # $1 = zone, $2 = second chain { createchain ${1}_dyn No run_iptables -A $2 -j ${1}_dyn } # # Add jumps to early SNAT chains # for interface in $ALL_INTERFACES; do addnatjump POSTROUTING $(snat_chain $interface) -o $interface done # # 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 > $STATEDIR/chains echo "$FW firewall" > $STATEDIR/zones # # Create forwarding chains for complex zones and generate jumps for IPSEC source hosts to that chain. # for zone in $ZONES; do if eval test -n \"\$${zone}_is_complex\" ; then frwd_chain=${zone}_frwd createchain $frwd_chain No if [ -n "$POLICY_MATCH" ]; then # # Because policy match only matches an 'in' or an 'out' policy (but not both), we have to place the # '--pol ipsec --dir in' rules at the front of the interface forwarding chains. Otherwise, decrypted packets # can match '--pol none --dir out' rules and send the packets down the wrong rules chain. # eval is_ipsec=\$${zone}_is_ipsec if [ -n "$is_ipsec" ]; then eval source_hosts=\$${zone}_hosts else eval source_hosts=\$${zone}_ipsec_hosts fi for host in $source_hosts; do interface=${host%%:*} networks=${host#*:} run_iptables2 -A $(forward_chain $interface) $(match_source_hosts $networks) $(match_ipsec_in $zone $host) -j $frwd_chain done fi fi done for zone in $ZONES; do eval source_hosts=\$${zone}_hosts chain1=$(rules_chain $FW $zone) chain2=$(rules_chain $zone $FW) eval complex=\$${zone}_is_complex eval type=\$${zone}_type [ -n "$complex" ] && frwd_chain=${zone}_frwd echo $zone $type $source_hosts >> $STATEDIR/zones need_broadcast= for host in $source_hosts; do interface=${host%%:*} networks=${host#*:} [ -n "$chain1" ] && run_iptables2 -A OUTPUT -o $interface $(match_dest_hosts $networks) $(match_ipsec_out $zone $host) -j $chain1 # # Add jumps from the builtin chain for DNAT rules # addrulejump PREROUTING $(dnat_chain $zone) -i $interface $(match_source_hosts $networks) $(match_ipsec_in $zone $host) [ -n "$chain2" ] && run_iptables2 -A $(input_chain $interface) $(match_source_hosts $networks) $(match_ipsec_in $zone $host) -j $chain2 if [ -n "$complex" ] && ! is_ipsec_host $zone $host ; then run_iptables2 -A $(forward_chain $interface) $(match_source_hosts $networks) $(match_ipsec_in $zone $host) -j $frwd_chain fi case $networks in *.*.*.*|+*) if [ "$networks" != 0.0.0.0/0 ]; then if ! list_search $interface $need_broadcast ; then interface_has_option $interface detectnets && need_broadcast="$need_broadcast $interface" fi fi ;; esac done if [ -n "$chain1" ]; then for interface in $need_broadcast ; do run_iptables -A OUTPUT -o $interface -d 255.255.255.255 -j $chain1 run_iptables -A OUTPUT -o $interface -d 224.0.0.0/4 -j $chain1 done fi for zone1 in $ZONES; do eval policy=\$${zone}2${zone1}_policy [ "$policy" = NONE ] && continue eval dest_hosts=\$${zone1}_hosts chain="$(rules_chain $zone $zone1)" [ -z "$chain" ] && continue # CONTINUE policy and there is no canonical chain. if [ $zone = $zone1 ]; then # # Try not to generate superfluous intra-zone rules # eval routeback=\"\$${zone}_routeback\" eval interfaces=\"\$${zone}_interfaces\" eval ports="\$${zone}_ports" num_ifaces=$(list_count1 $interfaces) # # If the zone has a single interface then what matters is how many ports it has # [ $num_ifaces -eq 1 -a -n "$ports" ] && num_ifaces=$(list_count1 $ports) # # If we don't need to route back and if we have only one interface or one port to # the zone then assume that hosts in the zone can communicate directly. # if [ $num_ifaces -lt 2 -a -z "$routeback" ] ; then continue fi else routeback= num_ifaces=0 fi if [ -n "$complex" ]; then for host1 in $dest_hosts; do interface1=${host1%%:*} networks1=${host1#*:} # # Only generate an intrazone rule if the zone has more than one interface (port) or if # routeback was specified for this host group # if [ $zone != $zone1 -o $num_ifaces -gt 1 ] || list_search $host1 $routeback ; then run_iptables2 -A $frwd_chain -o $interface1 $(match_dest_hosts $networks1) $(match_ipsec_out $zone1 $host1) -j $chain fi done else for host in $source_hosts; do interface=${host%%:*} networks=${host#*:} chain3=$(forward_chain $interface) for host1 in $dest_hosts; do interface1=${host1%%:*} networks1=${host1#*:} if [ "$host" != "$host1" ] || list_search $host $routeback; then run_iptables2 -A $chain3 $(match_source_hosts $networks) -o $interface1 $(match_dest_hosts $networks1) $(match_ipsec_out $zone1 $host1) -j $chain fi done done fi 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 $interface done chain=${FW}2${FW} if havechain $chain; then # # There is a fw->fw chain. Send loopback output through that chain # run_iptables -A OUTPUT -o lo -j $chain # # And delete the unconditional ACCEPT rule # run_iptables -D OUTPUT -o lo -j ACCEPT fi complete_standard_chain INPUT all $FW complete_standard_chain OUTPUT $FW all complete_standard_chain FORWARD all all # # Remove rules added to keep the firewall alive during [re]start" # disable_critical_hosts for chain in INPUT OUTPUT FORWARD; do [ -n "$FASTACCEPT" ] || run_iptables -D $chain -m state --state ESTABLISHED,RELATED -j ACCEPT run_iptables -D $chain -p udp --dport 53 -j ACCEPT done process_routestopped -D if [ -n "$LOGALLNEW" ]; then for table in mangle nat filter; do case $table in mangle) chains="PREROUTING INPUT FORWARD POSTROUTING" ;; nat) chains="PREROUTING POSTROUTING OUTPUT" ;; *) chains="INPUT FORWARD OUTPUT" ;; esac for chain in $chains; do log_rule_limit $LOGALLNEW $chain $table $chain "" "" -I -m state --state NEW -t $table done done fi } # # Compile a script that will stop the firewall # # This function is called by compile_firewall() so all of the overloaded functions # from that script are available here # compile_stop_firewall() { local IPTABLES_COMMAND="\$IPTABLES" local INDENT=" " cat >&3 << __EOF__ # # Stop/restore the firewall after an error or because of a "stop" or "clear" command # stop_firewall() { deletechain() { qt \$IPTABLES -L \$1 -n && qt \$IPTABLES -F \$1 && qt \$IPTABLES -X \$1 } deleteallchains() { \$IPTABLES -F \$IPTABLES -X } setcontinue() { \$IPTABLES -A \$1 -m state --state ESTABLISHED,RELATED -j ACCEPT } delete_nat() { \$IPTABLES -t nat -F \$IPTABLES -t nat -X if [ -f \${VARDIR}/nat ]; then while read external interface; do ip_addr_del \$external dev \$interface done < \${VARDIR}/nat rm -f \${VARDIR}/nat fi } case \$COMMAND in stop|clear) ;; *) set +x [ -n "\${RESTOREFILE:=restore}" ] RESTOREPATH=\${VARDIR}/\$RESTOREFILE if [ -x \$RESTOREPATH ]; then if [ -x \${RESTOREPATH}-ipsets ]; then progress_message2 Restoring Ipsets... # # We must purge iptables to be sure that there are no # references to ipsets # for table in mangle nat filter; do \$IPTABLES -t \$table -F \$IPTABLES -t \$table -X done \${RESTOREPATH}-ipsets fi echo Restoring \${PRODUCT:=Shorewall}... if \$RESTOREPATH restore; then echo "\$PRODUCT restored from \$RESTOREPATH" set_state "Started" else set_state "Unknown" fi kill \$\$ exit 2 fi ;; esac set_state "Stopping" STOPPING="Yes" TERMINATOR= deletechain shorewall determine_capabilities __EOF__ append_file stop cat >&3 << __EOF__ if [ -n "\$MANGLE_ENABLED" ]; then run_iptables -t mangle -F run_iptables -t mangle -X for chain in PREROUTING INPUT FORWARD POSTROUTING; do qt \$IPTABLES -t mangle -P \$chain ACCEPT done fi if [ -n "\$RAW_TABLE" ]; then run_iptables -t raw -F run_iptables -t raw -X for chain in PREROUTING OUTPUT; do qt \$IPTABLES -t raw -P \$chain ACCEPT done fi if [ -n "\$NAT_ENABLED" ]; then delete_nat for chain in PREROUTING POSTROUTING OUTPUT; do qt \$IPTABLES -t nat -P \$chain ACCEPT done fi if [ -f \${VARDIR}/proxyarp ]; then while read address interface external haveroute; do qt arp -i \$external -d \$address pub [ -z "\${haveroute}\${NOROUTES}" ] && qt ip route del \$address dev \$interface done < \${VARDIR}/proxyarp fi for f in /proc/sys/net/ipv4/conf/*; do [ -f \$f/proxy_arp ] && echo 0 > \$f/proxy_arp done __EOF__ [ -n "$CLEAR_TC" ] && save_command "delete_tc1" [ -n "$DISABLE_IPV6" ] && save_command "disable_ipv6" process_criticalhosts if [ -n "$CRITICALHOSTS" ]; then if [ -z "$ADMINISABSENTMINDED" ]; then cat >&3 << __EOF__ for chain in INPUT OUTPUT; do setpolicy \$chain ACCEPT done setpolicy FORWARD DROP deleteallchains for host in $CRITICALHOSTS; do interface=\${host%:*} networks=\${host#*:} \$IPTABLES -A INPUT -i \$interface \$(source_ip_range \$networks) -j ACCEPT \$IPTABLES -A OUTPUT -o \$interface \$(dest_ip_range \$networks) -j ACCEPT done for chain in INPUT OUTPUT; do setpolicy $\chain DROP done __EOF__ else cat >&3 << __EOF__ for chain in INPUT OUTPUT; do setpolicy \$chain ACCEPT done setpolicy FORWARD DROP deleteallchains for host in $CRITICALHOSTS; do interface=\${host%:*} networks=\${host#*:} \$IPTABLES -A INPUT -i \$interface \$(source_ip_range \$networks) -j ACCEPT \$IPTABLES -A OUTPUT -o \$interface \$(dest_ip_range \$networks) -j ACCEPT done setpolicy INPUT DROP for chain in INPUT FORWARD; do setcontinue \$chain done __EOF__ fi elif [ -z "$ADMINISABSENTMINDED" ]; then cat >&3 << __EOF__ for chain in INPUT OUTPUT FORWARD; do setpolicy \$chain DROP done deleteallchains __EOF__ else cat >&3 << __EOF__ for chain in INPUT FORWARD; do setpolicy \$chain DROP done setpolicy OUTPUT ACCEPT deleteallchains for chain in INPUT FORWARD; do setcontinue \$chain done __EOF__ fi process_routestopped -A save_command "\$IPTABLES -A INPUT -i lo -j ACCEPT" [ -z "$ADMINISABSENTMINDED" ] && \ save_command "\$IPTABLES -A OUTPUT -o lo -j ACCEPT" for interface in $(find_interfaces_by_option dhcp); do save_command "\$IPTABLES -A INPUT -p udp -i $interface --dport 67:68 -j ACCEPT" [ -z "$ADMINISABSENTMINDED" ] && \ save_command "\$IPTABLES -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT" # # This might be a bridge # save_command "\$IPTABLES -A FORWARD -p udp -i $interface -o $interface --dport 67:68 -j ACCEPT" done save_command case "$IP_FORWARDING" in [Oo][Nn]) save_command "echo 1 > /proc/sys/net/ipv4/ip_forward" save_command "progress_message2 IP Forwarding Enabled" ;; [Oo][Ff][Ff]) save_command "echo 0 > /proc/sys/net/ipv4/ip_forward" save_command "progress_message2 IP Forwarding Disabled!" ;; esac append_file stopped cat >&3 << __EOF__ set_state "Stopped" logger "Shorewall Stopped" 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 # kill \$\$ ;; esac } __EOF__ } # # Compile a Restore Script # compile_firewall() # $1 = File Name { local IPTABLES_COMMAND=run_iptables local INDENT="" outfile=$1 dir= # # Overload a function from the library # deletechain() # $1 = name of chain { save_command "qt \$IPTABLES -L $1 -n && qt \$IPTABLES -F $1 && qt \$IPTABLES -X $1" } # # END OVERLOADED FUNCTIONS # # # So that mktempdir doesn't have to jump through hoops when there isn't a working 'mktemp', # we create the compiler's temporary directory in TMP_DIR # STATEDIR=$TMP_DIR/compiler_state/ mkdir $STATEDIR || fatal_error "Cannot create temporary directory in $TMP_DIR" if [ $COMMAND = compile ]; then dir=$(dirname $1) [ -d $dir ] || fatal_error "Directory $dir does not exist" [ -h $dir ] && fatal_error "$dir is a Symbolic Link" [ -d $outfile ] && fatal_error "$outfile is a Directory" [ -h $outfile ] && fatal_error "$outfile is a Symbolic Link" [ -f $outfile -a ! -x $outfile ] && fatal_error "$outfile exists and is not a restore file" DOING=Compiling DONE=compiled OUTPUT=$(mktempfile $STATEDIR) [ -n "$OUTPUT" ] || fatal_error "Cannot create temporary file in /tmp" exec 3>>$OUTPUT else DOING=Checking DONE=checked exec 3>/dev/null fi cat >&3 << __EOF__ # # Compiled firewall script generated by Shorewall $VERSION - $(date)" # __EOF__ if [ -n "$EXPORT" ]; then cat >&3 << __EOF__ SHAREDIR=/usr/share/shorewall-lite CONFDIR=/etc/shorewall-lite VARDIR=/var/lib/shorewall-lite __EOF__ else cat >&3 << __EOF__ SHAREDIR=/usr/share/shorewall CONFDIR=/etc/shorewall VARDIR=/var/lib/shorewall __EOF__ fi cat >&3 << __EOF__ . \${SHAREDIR}/functions __EOF__ compile_stop_firewall cat >&3 << __EOF__ # # Set policy of chain \$1 to \$2 # setpolicy() { \$IPTABLES -P \$1 \$2 } # # Remove all Shorewall-added rules # clear_firewall() { stop_firewall setpolicy INPUT ACCEPT setpolicy FORWARD ACCEPT setpolicy OUTPUT ACCEPT run_iptables -F echo 1 > /proc/sys/net/ipv4/ip_forward __EOF__ if [ -n "$DISABLE_IPV6" ]; then cat >&3 << __EOF__ if qt mywhich ip6tables; then ip6tables -P INPUT ACCEPT 2> /dev/null ip6tables -P OUTPUT ACCEPT 2> /dev/null ip6tables -P FORWARD ACCEPT 2> /dev/null fi __EOF__ fi append_file clear cat >&3 << __EOF__ set_state "Cleared" logger "Shorewall Cleared" } # # Issue a message and stop/restore the firewall # fatal_error() { echo " ERROR: \$@" >&2 stop_firewall exit 2 } # # Issue a message and stop # startup_error() # \$* = Error Message { echo " ERROR: \$@" >&2 kill \$\$ exit 2 } # # Run iptables and if an error occurs, stop/restore the firewall # run_iptables() { if ! \$IPTABLES \$@; then error_message "ERROR: Command \"\$IPTABLES \$@\" Failed" stop_firewall exit 2 fi } # # Run iptables and if an error occurs, stop/restore the firewall # run_ip() { if ! ip \$@; then error_message "ERROR: Command \"ip \$@\" Failed" stop_firewall exit 2 fi } # # Run tc and if an error occurs, stop/restore the firewall # run_tc() { if ! tc \$@ ; then error_message "ERROR: Command \"tc \$@\" Failed" stop_firewall exit 2 fi } # # Functions to appease unconverted extension scripts # save_command() { return 0 } run_and_save_command() { eval \$@ } ensure_and_save_command() { eval \$@ || fatal_error "Command \"\$@\" failed" } __EOF__ # # The following function(s) can be removed when we require version 30192 (below) # cat >&3 << __EOF__ # # Undo the effect of 'separate_list()' # combine_list() { local f o= for f in \$* ; do o="\${o:+\$o,}\$f" done echo \$o } # # Initialize environment # initialize() { __EOF__ INDENT=" " if [ -n "$EXPORT" ]; then cat >&3 << __EOF__ if [ ! -f \${SHAREDIR}/version ]; then fatal_error "This script requires Shorewall Lite which do not appear to be installed on this system" fi local version=\$(cat \${SHAREDIR}/version) if [ \${LIBVERSION:-0} -lt 30191 ]; then fatal_error "This script requires Shorewall Lite version 3.2.0-RC2 or later; current version is \$version" fi __EOF__ else cat >&3 << __EOF__ if [ ! -f \${SHAREDIR}/version ]; then fatal_error "This script requires Shorewall which do not appear to be installed on this system (did you forget "-e" when you compiled?)" fi local version=\$(cat \${SHAREDIR}/version) if [ \${LIBVERSION:-0} -lt 30191 ]; then fatal_error "This script requires Shorewall version 3.2.0-Beta7 or later; current version is \$version" fi __EOF__ fi cat >&3 << __EOF__ # # These variables are required by the library functions called in this script # [ -n "\${COMMAND:=restart}" ] [ -n "\${VERBOSE:=0}" ] MODULESDIR="$MODULESDIR" MODULE_SUFFIX="$MODULE_SUFFIX" LOGLIMIT="$LOGLIMIT" LOGTAGONLY="$LOGTAGONLY" LOGRULENUMBERS="$LOGRULENUMBERS" __EOF__ if [ -n "$LOGFORMAT" ]; then cat >&3 << __EOF__ LOGFORMAT="$LOGFORMAT" __EOF__ else cat >&3 << __EOF__ [ -n "\$LOGFORMAT\" ] || LOGFORMAT="Shorewall:%s:%s:" __EOF__ fi cat >&3 << __EOF__ RESTOREFILE="$RESTOREFILE" VERSION="$VERSION" CONFIG_PATH="$CONFIG_PATH" SUBSYSLOCK="$SUBSYSLOCK" PATH="$PATH" TERMINATOR=fatal_error __EOF__ if [ -n "$IPTABLES" ]; then cat >&3 << __EOF__ IPTABLES="$IPTABLES" [ -e "$IPTABLES" ] || startup_error "IPTABLES=$IPTABLES does not exist or is not executable" __EOF__ else cat >&3 << __EOF__ [ -z "\$IPTABLES" ] && IPTABLES=\$(mywhich iptables 2> /dev/null) [ -n "\$IPTABLES" -a -e "\$IPTABLES" ] || startup_error "Can't find iptables executable" __EOF__ fi append_file params cat >&3 << __EOF__ STOPPING= # # The library requires that ${VARDIR} exist # [ -d \${VARDIR} ] || mkdir -p \${VARDIR} } # # Start/Restart/Reload the firewall # define_firewall() { local restore_file=\$1 __EOF__ INDENT=" " cat >&3 << __EOF__ load_kernel_modules __EOF__ progress_message2 "Initializing..." save_progress_message "Initializing..." initialize_netfilter progress_message2 "$DOING Proxy ARP"; setup_proxy_arp # # [re]-Establish routing # setup_providers $(find_file providers) [ -n "$ROUTEMARK_INTERFACES" ] && setup_routes progress_message2 "$DOING NAT..."; setup_nat progress_message2 "$DOING NETMAP..."; setup_netmap progress_message2 "$DOING Common Rules"; add_common_rules save_progress_message "Setting up SYN Flood Protection..." setup_syn_flood_chains save_progress_message "Setting up IPSEC management..." setup_ipsec maclist_hosts=$(find_hosts_by_option maclist) if [ -n "$maclist_hosts" ]; then save_progress_message "Setting up MAC Filtration..." setup_mac_lists fi progress_message2 "$DOING $(find_file rules)..." save_progress_message "Setting up Rules..." process_rules tunnels=$(find_file tunnels) if [ -f $tunnels ]; then progress_message2 "$DOING $tunnels..." save_progress_message "Setting up Tunnels..." setup_tunnels $tunnels fi save_progress_message "Setting up Actions..." progress_message2 "$DOING Actions..."; process_actions2 process_actions3 save_progress_message "Applying Policies..." progress_message2 "$DOING $(find_file policy)..."; apply_policy_rules masq=$(find_file masq) if [ -f $masq ]; then setup_masq $masq fi if [ -n "$MANGLE_ENABLED" ]; then tos=$(find_file tos) if [ -f $tos ]; then save_progress_message "Setting up TOS..." process_tos $tos fi ecn=$(find_file ecn) if [ -f $ecn ]; then save_progress_message "Setting up ECN..." setup_ecn $ecn fi save_progress_message "Setting up TC Rules..." setup_tc fi progress_message2 "$DOING Rule Activation..." save_progress_message "Activating Rules..." activate_rules if [ -n "$ALIASES_TO_ADD" ]; then save_command add_ip_aliases $ALIASES_TO_ADD fi for file in chains nat proxyarp zones; do save_command "cat > \${VARDIR}/$file $LEFTSHIFT __EOF__" cat $STATEDIR/$file >&3 save_command_unindented __EOF__ done cat >&3 << __EOF__ if [ \$COMMAND = restore ]; then iptables-restore < \$restore_file fi __EOF__ save_command "date > \${VARDIR}/restarted" append_file start [ -n "$DELAYBLACKLISTLOAD" ] && refresh_blacklist createchain shorewall no save_command set_state "Started" append_file started cat >&3 << __EOF__ cp -f \$(my_pathname) \${VARDIR}/.restore case \$COMMAND in start) logger "Shorewall started" ;; restart) logger "Shorewall restarted" ;; restore) logger "Shorewall restored" ;; esac } # # Silently define Firewall and ignore errors # restore_firewall() { iptables_save_file=\${VARDIR}/\$(basename \$0)-iptables fatal_error() { echo " ERROR: \$@" >&2 } startup_error() # \$@ = Error Message { echo " ERROR: \$@" >&2 } run_iptables() { return 0; } VERBOSE=-1 # The progress messages don't make sense without iptables IPTABLES=run_iptables if [ -f \$iptables_save_file ]; then { define_firewall \$iptables_save_file } else fatal_error "\$iptables_save_file does not exist" exit 2 fi } __EOF__ exec 3>&- if [ $COMMAND = check ]; then progress_message3 "Shorewall configuration verified" else INDENT= cat $(find_file prog.header) $OUTPUT $(find_file prog.footer) > $outfile chmod 700 $outfile progress_message3 "Shorewall configuration compiled to $(resolve_file $outfile)" rm -f $OUTPUT fi rm -rf $TMP_DIR } # # 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 $val in [Yy][Ee][Ss]) echo "Yes" ;; [Nn][Oo]) echo "" ;; *) fatal_error "Invalid value ($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 $val in [Yy][Ee][Ss]) echo "Yes" ;; [Nn][Oo]) echo "" ;; *) fatal_error "Invalid value ($val) for $1" ;; esac fi } # # Initialize this program # do_initialize() { # Run all utility programs using the C locale # # Thanks to Vincent Planchenault for this tip # export LC_ALL=C # Make sure umask is sane umask 077 PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin # # Establish termination function # TERMINATOR=fatal_error # # Clear all configuration variables # VERSION= IPTABLES= FW= SUBSYSLOCK= ALLOWRELATED=Yes LOGRATE= LOGBURST= LOGPARMS= LOGLIMIT= ADD_IP_ALIASES= ADD_SNAT_ALIASES= TC_ENABLED= BLACKLIST_DISPOSITION= BLACKLIST_LOGLEVEL= CLAMPMSS= ROUTE_FILTER= LOG_MARTIANS= DETECT_DNAT_IPADDRS= MUTEX_TIMEOUT= FORWARDPING= MACLIST_DISPOSITION= MACLIST_LOG_LEVEL= TCP_FLAGS_DISPOSITION= TCP_FLAGS_LOG_LEVEL= RFC1918_LOG_LEVEL= MARK_IN_FORWARD_CHAIN= FUNCTIONS= VERSION_FILE= LOGFORMAT= LOGRULENUMBERS= ADMINISABSENTMINDED= BLACKLISTNEWONLY= MODULE_SUFFIX= ACTIONS= USEDACTIONS= SMURF_LOG_LEVEL= DISABLE_IPV6= BRIDGING= PKTTYPE= USEPKTYPE= RETAIN_ALIASES= DELAYBLACKLISTLOAD= LOGTAGONLY= LOGALLNEW= RFC1918_STRICT= MACLIST_TTL= SAVE_IPSETS= RESTOREFILE= MAPOLDACTIONS= IMPLICIT_CONTINUE= HIGH_ROUTE_MARKS= OUTPUT= TMP_DIR= ALL_INTERFACES= ROUTEMARK_INTERFACES= IPSECMARK=256 PROVIDERS= CRITICALHOSTS= IPSECFILE= EXCLUSION_SEQ=1 STOPPING= HAVE_MUTEX= ALIASES_TO_ADD= SECTION=ESTABLISHED SECTIONS= ALL_PORTS= SHAREDIR=/usr/share/shorewall VARDIR=/var/lib/shorewall [ -z "$EXPORT" ] && CONFDIR=/etc/shorewall || CONFDIR=${SHAREDIR}/configfiles FUNCTIONS=${SHAREDIR}/functions [ -n "${VERBOSE:=2}" ] if [ -f $FUNCTIONS ]; then [ $VERBOSE -ge 2 ] && echo "Loading $FUNCTIONS..." . $FUNCTIONS else fatal_error "$FUNCTIONS does not exist!" fi TMP_DIR=$(mktempdir) [ -n "$TMP_DIR" ] && chmod 700 $TMP_DIR || \ fatal_error "Can't create a temporary directory" trap "[ -n "$OUTPUT" ] && rm -f $OUTPUT;rm -rf $TMP_DIR; exit 2" 1 2 3 4 5 6 9 ensure_config_path VERSION_FILE=$SHAREDIR/version [ -f $VERSION_FILE ] && VERSION=$(cat $VERSION_FILE) run_user_exit params config=$(find_file shorewall.conf) if [ -f $config ]; then if [ -r $config ]; then progress_message "Processing $config..." . $config else fatal_error "Cannot read $config (Hint: Are you root?)" fi else fatal_error "$config does not exist!" fi # # Restore CONFIG_PATH if the shorewall.conf file cleared it # ensure_config_path # # Determine the capabilities of the installed iptables/netfilter # We load the kernel modules here to accurately determine # capabilities when module autoloading isn't enabled. # PKTTYPE=$(added_param_value_no PKTTYPE $PKTTYPE) [ -n "${MODULE_SUFFIX:=o gz ko o.gz ko.gz}" ] if [ -z "$EXPORT" -a "$(whoami)" = root ]; then load_kernel_modules if [ -z "$IPTABLES" ]; then IPTABLES=$(mywhich iptables 2> /dev/null) [ -z "$IPTABLES" ] && fatal_error "Can't find iptables executable" else [ -e "$IPTABLES" ] || fatal_error "\$IPTABLES=$IPTABLES does not exist or is not executable" fi determine_capabilities else f=$(find_file capabilities) [ -f $f ] && . $f || fatal_error "The -e flag requires a capabilities file" fi ALLOWRELATED="$(added_param_value_yes ALLOWRELATED $ALLOWRELATED)" [ -n "$ALLOWRELATED" ] || \ fatal_error "ALLOWRELATED=No is not supported" ADD_IP_ALIASES="$(added_param_value_yes ADD_IP_ALIASES $ADD_IP_ALIASES)" if [ -n "${LOGRATE}${LOGBURST}" ]; then LOGLIMIT="--match limit" [ -n "$LOGRATE" ] && LOGLIMIT="$LOGLIMIT --limit $LOGRATE" [ -n "$LOGBURST" ] && LOGLIMIT="$LOGLIMIT --limit-burst $LOGBURST" fi if [ -n "$IP_FORWARDING" ]; then case "$IP_FORWARDING" in [Oo][Nn]|[Oo][Ff][Ff]|[Kk][Ee][Ee][Pp]) ;; *) fatal_error "Invalid value ($IP_FORWARDING) for IP_FORWARDING" ;; esac else IP_FORWARDING=On fi [ -n "${BLACKLIST_DISPOSITION:=DROP}" ] case "$CLAMPMSS" in [0-9]*) ;; *) CLAMPMSS=$(added_param_value_no CLAMPMSS $CLAMPMSS) ;; esac ADD_SNAT_ALIASES=$(added_param_value_no ADD_SNAT_ALIASES $ADD_SNAT_ALIASES) ROUTE_FILTER=$(added_param_value_no ROUTE_FILTER $ROUTE_FILTER) LOG_MARTIANS=$(added_param_value_no LOG_MARTIANS $LOG_MARTIANS) DETECT_DNAT_IPADDRS=$(added_param_value_no DETECT_DNAT_IPADDRS $DETECT_DNAT_IPADDRS) FORWARDPING=$(added_param_value_no FORWARDPING $FORWARDPING) [ -n "$FORWARDPING" ] && \ fatal_error "FORWARDPING=Yes is no longer supported" maclist_target=reject if [ -n "$MACLIST_DISPOSITION" ] ; then case $MACLIST_DISPOSITION in REJECT) ;; DROP) maclist_target=DROP ;; ACCEPT) maclist_target=RETURN ;; *) fatal_error "Invalid value ($MACLIST_DISPOSITION) for MACLIST_DISPOSITION" ;; esac else MACLIST_DISPOSITION=REJECT fi if [ -n "$TCP_FLAGS_DISPOSITION" ] ; then case $TCP_FLAGS_DISPOSITION in REJECT|ACCEPT|DROP) ;; *) fatal_error "Invalid value ($TCP_FLAGS_DISPOSITION) for TCP_FLAGS_DISPOSITION" ;; esac else TCP_FLAGS_DISPOSITION=DROP fi [ -n "${RFC1918_LOG_LEVEL:=info}" ] MARK_IN_FORWARD_CHAIN=$(added_param_value_no MARK_IN_FORWARD_CHAIN $MARK_IN_FORWARD_CHAIN) [ -n "$MARK_IN_FORWARD_CHAIN" ] && MARKING_CHAIN=tcfor || MARKING_CHAIN=tcpre CLEAR_TC=$(added_param_value_yes CLEAR_TC $CLEAR_TC) if [ -n "$LOGFORMAT" ]; then if [ -n "$(echo $LOGFORMAT | grep '%d')" ]; then LOGRULENUMBERS=Yes temp=$(printf "$LOGFORMAT" fooxx 1 barxx 2> /dev/null) if [ $? -ne 0 ]; then fatal_error "Invalid LOGFORMAT string: \"$LOGFORMAT\"" fi else temp=$(printf "$LOGFORMAT" fooxx barxx 2> /dev/null) if [ $? -ne 0 ]; then fatal_error "Invalid LOGFORMAT string: \"$LOGFORMAT\"" fi fi [ ${#temp} -le 29 ] || fatal_error "LOGFORMAT string is longer than 29 characters: \"$LOGFORMAT\"" else LOGFORMAT="Shorewall:%s:%s:" fi ADMINISABSENTMINDED=$(added_param_value_no ADMINISABSENTMINDED $ADMINISABSENTMINDED) BLACKLISTNEWONLY=$(added_param_value_no BLACKLISTNEWONLY $BLACKLISTNEWONLY) DISABLE_IPV6=$(added_param_value_no DISABLE_IPV6 $DISABLE_IPV6) BRIDGING=$(added_param_value_no BRIDGING $BRIDGING) STARTUP_ENABLED=$(added_param_value_yes STARTUP_ENABLED $STARTUP_ENABLED) RETAIN_ALIASES=$(added_param_value_no RETAIN_ALIASES $RETAIN_ALIASES) [ -n "${ADD_IP_ALIASES}${ADD_SNAT_ALIASES}" ] || RETAIN_ALIASES= DELAYBLACKLISTLOAD=$(added_param_value_no DELAYBLACKLISTLOAD $DELAYBLACKLISTLOAD) LOGTAGONLY=$(added_param_value_no LOGTAGONLY $LOGTAGONLY) RFC1918_STRICT=$(added_param_value_no RFC1918_STRICT $RFC1918_STRICT) SAVE_IPSETS=$(added_param_value_no SAVE_IPSETS $SAVE_IPSETS) MAPOLDACTIONS=$(added_param_value_yes MAPOLDACTIONS $MAPOLDACTIONS) FASTACCEPT=$(added_param_value_no FASTACCEPT $FASTACCEPT) IMPLICIT_CONTINUE=$(added_param_value_no IMPLICIT_CONTINUE $IMPLICIT_CONTINUE) HIGH_ROUTE_MARKS=$(added_param_value_no HIGH_ROUTE_MARKS $HIGH_ROUTE_MARKS) [ -n "$XCONNMARK_MATCH" ] || XCONNMARK= [ -n "$XMARK" ] || XCONNMARK= [ -n "$HIGH_ROUTE_MARKS" -a -z "$XCONNMARK" ] && fatal_error "HIGH_ROUTE_MARKS=Yes requires extended CONNMARK target, extended CONNMARK match support and extended MARK support" case ${IPSECFILE:=ipsec} in ipsec|zones) ;; *) fatal_error "Invalid value ($IPSECFILE) for IPSECFILE option" ;; esac case ${MACLIST_TABLE:=filter} in filter) ;; mangle) [ $MACLIST_DISPOSITION = reject ] && fatal_error "MACLIST_DISPOSITION=REJECT is not allowed with MACLIST_TABLE=mangle" ;; *) fatal_error "Invalid value ($MACLIST_TABLE) for MACLIST_TABLE option" ;; esac TC_SCRIPT= if [ -n "$TC_ENABLED" ] ; then case "$TC_ENABLED" in [Yy][Ee][Ss]) TC_ENABLED= TC_SCRIPT=$(find_file tcstart) [ -f $TC_SCRIPT ] || fatal_error "Unable to find tcstart file" ;; [Ii][Nn][Tt][Ee][Rr][Nn][Aa][Ll]) TC_ENABLED=Yes ;; [Nn][Oo]) TC_ENABLED= ;; esac else TC_ENABLED=Yes fi if [ -n "$TC_ENABLED" ];then [ -n "$MANGLE_ENABLED" ] || fatal_error "Traffic Shaping requires mangle support in your kernel and iptables" fi [ "x${SHOREWALL_DIR}" = "x." ] && SHOREWALL_DIR="$PWD" # # Strip the files that we use often # strip_file interfaces strip_file hosts # # Check out the user's shell # [ -n "${SHOREWALL_SHELL:=/bin/sh}" ] temp=$(decodeaddr 192.168.1.1) if [ $(encodeaddr $temp) != 192.168.1.1 ]; then fatal_error "Shell $SHOREWALL_SHELL is broken and may not be used with Shorewall" fi if [ -z "$KLUDGEFREE" ]; then rm -f $TMP_DIR/physdev rm -f $TMP_DIR/iprange fi qt mywhich awk && HAVEAWK=Yes || HAVEAWK= } # # Give Usage Information # usage() { echo "Usage: $0 [debug] check|compile }" 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 "exit 2" 1 2 3 4 5 6 9 COMMAND="$1" case "$COMMAND" in check) [ $# -ne 1 ] && usage do_initialize compile_firewall ;; compile) [ $# -ne 2 ] && usage do_initialize compile_firewall $2 ;; call) # # Undocumented way to call functions in ${SHAREDIR}/compiler directly # shift do_initialize EMPTY= $@ ;; *) usage ;; esac