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#!/bin/sh
#
# Shorewall 3.2 -- /usr/share/shorewall/functions
#
# 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)
#
# 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
LIBVERSION=30200
[ -n "${VARDIR:=/var/lib/shorewall}" ]
[ -n "${SHAREDIR:=/usr/share/shorewall}" ]
[ -n "${CONFDIR:=/etc/shorewall}" ]
#
# Message to stderr
#
error_message() # $* = Error Message
{
echo " $@" >&2
}
# Function to truncate a string -- It uses 'cut -b -<n>'
# rather than ${v:first:last} because light-weight shells like ash and
# dash do not support that form of expansion.
#
truncate() # $1 = length
{
cut -b -${1}
}
#
# Split a colon-separated list into a space-separated list
#
split() {
local ifs=$IFS
IFS=:
set -- $1
echo $*
IFS=$ifs
}
#
# Search a list looking for a match -- returns zero if a match found
# 1 otherwise
#
list_search() # $1 = element to search for , $2-$n = list
{
local e=$1
while [ $# -gt 1 ]; do
shift
[ "x$e" = "x$1" ] && return 0
done
return 1
}
#
# Return a space separated list of values matching
#
list_walk() # $1 = element to search for, $2-$n = list
{
local e=$1 result=
while [ $# -gt 1 ]; do
shift
case $1 in
$e*)
result="$result ${1##$e}"
;;
esac
done
echo $result
}
#
# Functions to count list elements
# - - - - - - - - - - - - - - - -
# Whitespace-separated list
#
list_count1() {
echo $#
}
#
# Comma-separated list
#
list_count() {
list_count1 $(separate_list $1)
}
#
# Conditionally produce message
#
progress_message() # $* = Message
{
local timestamp=
if [ $VERBOSE -gt 1 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
progress_message2() # $* = Message
{
local timestamp=
if [ $VERBOSE -gt 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
progress_message3() # $* = Message
{
local timestamp=
if [ $VERBOSE -ge 0 ]; then
[ -n "$TIMESTAMP" ] && timestamp="$(date +%H:%M:%S) "
echo "${timestamp}$@"
fi
}
#
# Suppress all output for a command
#
qt()
{
"$@" >/dev/null 2>&1
}
#
# Determine if Shorewall is "running"
#
shorewall_is_started() {
qt $IPTABLES -L shorewall -n
}
#
# Perform variable substitution on the passed argument and echo the result
#
expand() # $@ = contents of variable which may be the name of another variable
{
eval echo \"$@\"
}
#
# Perform variable substitition on the values of the passed list of variables
#
expandv() # $* = list of variable names
{
local varval
while [ $# -gt 0 ]; do
eval varval=\$${1}
eval $1=\"$varval\"
shift
done
}
#
# Add whitespace after "!"
#
fix_bang()
{
local result=
while [ $# -gt 0 ]; do
case $1 in
!*)
result="$result ! ${1#!}"
;;
*)
result="$result $1"
;;
esac
shift
done
echo $result
}
#
# Echos the fully-qualified name of the calling shell program
#
my_pathname() {
cd $(dirname $0)
echo $PWD/$(basename $0)
}
#
# Set default config path
#
ensure_config_path() {
local F=${SHAREDIR}/configpath
if [ -z "$CONFIG_PATH" ]; then
[ -f $F ] || { echo " ERROR: $F does not exist"; exit 2; }
. $F
fi
}
#
# Find a File -- For relative file name, look first in $SHOREWALL_DIR then in ${CONFDIR}
#
find_file()
{
local saveifs= directory
case $1 in
/*)
echo $1
;;
*)
if [ -n "$SHOREWALL_DIR" -a -f $SHOREWALL_DIR/$1 ]; then
echo $SHOREWALL_DIR/$1
else
saveifs=$IFS
IFS=:
for directory in $CONFIG_PATH; do
if [ -f $directory/$1 ]; then
echo $directory/$1
IFS=$saveifs
return
fi
done
IFS=$saveifs
echo ${CONFDIR}/$1
fi
;;
esac
}
#
# Get fully-qualified name of file
#
resolve_file() # $1 = file name
{
local pwd=$PWD
case $1 in
/*)
echo $1
;;
./*)
echo ${pwd}${1#.}
;;
../*)
cd ..
resolve_file ${1#../}
cd $pwd
;;
*)
echo $pwd/$1
;;
esac
}
##
# Source a user exit file if it exists
#
run_user_exit() # $1 = file name
{
local user_exit=$(find_file $1)
if [ -f $user_exit ]; then
progress_message "Processing $user_exit ..."
. $user_exit
fi
}
#
# Replace commas with spaces and echo the result
#
separate_list() {
local list="$@"
local part
local newlist
local firstpart
local lastpart
local enclosure
case "$list" in
*,|,*|*,,*|*[[:space:]]*)
#
# There's been whining about us not catching embedded white space in
# comma-separated lists. This is an attempt to snag some of the cases.
#
# The 'TERMINATOR' function will be set by the 'firewall' script to
# either 'startup_error' or 'fatal_error' depending on the command and
# command phase
#
[ -n "$TERMINATOR" ] && \
$TERMINATOR "Invalid comma-separated list \"$@\""
echo "WARNING -- invalid comma-separated list \"$@\"" >&2
;;
*\[*\]*)
#
# Where we need to embed comma-separated lists within lists, we enclose them
# within square brackets.
#
firstpart=${list%%\[*}
lastpart=${list#*\[}
enclosure=${lastpart%%\]*}
lastpart=${lastpart#*\]}
case $lastpart in
\,*)
case $firstpart in
*\,)
echo "$(separate_list ${firstpart%,}) [$enclosure] $(separate_list ${lastpart#,})"
;;
*)
echo "$(separate_list $firstpart)[$enclosure] $(separate_list ${lastpart#,})"
;;
esac
;;
*)
case $firstpart in
*\,)
echo "$(separate_list ${firstpart%,}) [$enclosure]$(separate_list $lastpart)"
;;
*)
echo "$(separate_list $firstpart)[$enclosure]$(separate_list $lastpart)"
;;
esac
;;
esac
return
;;
esac
list="$@"
part="${list%%,*}"
newlist="$part"
while [ "x$part" != "x$list" ]; do
list="${list#*,}";
part="${list%%,*}";
newlist="$newlist $part";
done
echo "$newlist"
}
#
# Undo the effect of 'separate_list()'
#
combine_list()
{
local f o=
for f in $* ; do
o="${o:+$o,}$f"
done
echo $o
}
#
# 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" ] || startup_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" ] && startup_error "Sub-zones of the firewall zone are not allowed"
list_search $parent $ZONES || startup_error "Parent zone not defined: $parent"
done
[ ${#zone} -gt 5 ] && startup_error "Zone name longer than 5 characters: $zone"
case "$zone" in
[0-9*])
startup_error "Illegal zone name \"$zone\" in zones file"
;;
all|none)
startup_error "Reserved zone name \"$zone\" in zones file"
;;
esac
if [ -n "$new_zone_file" ]; then
case ${type:=ipv4} in
ipv4|IPv4|IPV4|plain|-)
list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
merge_zone
IPV4_ZONES="$IPV4_ZONES $zone"
;;
ipsec|IPSEC|ipsec4|IPSEC4)
list_search $zone $ZONES $FW && startup_error "Zone $zone is defined more than once"
[ -n "$POLICY_MATCH" ] || startup_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" ] && startup_error "Only one firewall zone may be defined"
list_search $zone $ZONES && startup_error "Zone $zone is defined more than once"
[ -n "$parents" ] && startup_error "The firewall zone may not be nested"
for r in $rest; do
[ "x$r" = x- ] || startup_error "OPTIONS not allowed on the firewall zone"
done
FW=$zone
;;
*)
startup_error "Invalid Zone Type: $type"
;;
esac
eval ${zone}_type=$type
else
list_search $zone $ZONES $FW && startup_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" ] && startup_error "No ipv4 or ipsec Zones Defined"
[ -z "$FW" ] && startup_error "No Firewall Zone Defined"
}
#
# Validate the zone names and options in the interfaces file
#
validate_interfaces_file() {
local wildcard
local found_obsolete_option=
local z interface networks options r iface option
while read z interface networks options; do
expandv z interface networks options
r="$z $interface $networks $options"
[ "x$z" = "x-" ] && z=
if [ -n "$z" ]; then
validate_zone $z || startup_error "Invalid zone ($z) in record \"$r\""
fi
list_search $interface $ALL_INTERFACES && \
startup_error "Duplicate Interface $interface"
wildcard=
case $interface in
*:*|+)
startup_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 $option in
-)
;;
dhcp|tcpflags|arp_filter|routefilter|maclist|logmartians|sourceroute|blacklist|proxyarp|nosmurfs|upnp|-)
;;
norfc1918)
if [ "$PROGRAM" = compiler ]; then
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__
else
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 $network; then
startup_error "The 'norfc1918' option may not be specified on an interface with an RFC 1918 address. Interface:$interface"
fi
done
fi
fi
;;
arp_ignore=*)
eval ${iface}_arp_ignore=${option#*=}
;;
arp_ignore)
eval ${iface}_arp_ignore=1
;;
detectnets)
[ -n "$wildcard" ] && \
startup_error "The \"detectnets\" option may not be used with a wild-card interface"
[ -n "$EXPORT" ] && \
startup_error "'detectnets' not permitted with the -e run-line option"
;;
routeback)
[ -n "$z" ] || startup_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" ] && startup_error "No Interfaces Defined"
}
#
# 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 $FW; 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 "" - $2 = option list
{
local option newoptions= val
[ x${2} = x- ] && return
for option in $(separate_list $2); do
val=${option#*=}
case $option in
mss=[0-9]*) [ "$PROGRAM" = compiler ] && 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
}
#
# 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 $z || startup_error "Invalid zone ($z) in record \"$r\""
case $hosts in
*:*)
interface=${hosts%%:*}
iface=$(chain_base $interface)
list_search $interface $ALL_INTERFACES || \
startup_error "Unknown interface ($interface) in record \"$r\""
hosts=${hosts#*:}
;;
*)
startup_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%:*} && \
startup_error "Bridged interfaces may not be defined in ${CONFDIR}/interfaces: $host"
check_bridge_port ${host%%:*}
;;
*.*.*)
;;
*+|+*)
eval ${z}_is_complex=Yes
;;
*)
known_interface $host && \
startup_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
;;
*)
startup_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" ] || \
startup_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"
}
#
# 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
}
#
# Functions for creating dynamic zone rules
#
dynamic_fwd() # $1 = interface
{
echo $(chain_base $1)_dynf
}
dynamic_in() # $1 = interface
{
echo $(chain_base $1)_dyni
}
dynamic_out() # $1 = interface
{
echo $(chain_base $1)_dyno
}
dynamic_chains() #$1 = interface
{
local c=$(chain_base $1)
echo ${c}_dyni ${c}_dynf ${c}_dyno
}
#
# 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 "detectnets not allowed on interface with default route - $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 && \
startup_error "Invalid zone definition for zone $zone"
list_search $interface:0/0 $hosts && \
startup_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
}
#
# 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')"
}
#
# 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
}
#
# 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 ${host1#*:}) -j ACCEPT
done
fi
done
}
process_criticalhosts()
{
local hosts= interface host h options networks criticalhosts=
strip_file routestopped
while read interface host options; do
expandv interface host options
[ "x$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
}
#
# Load a Kernel Module
#
loadmodule() # $1 = module name, $2 - * arguments
{
local modulename=$1
local modulefile
local suffix
moduleloader=modprobe
if ! qt mywhich modprobe; then
moduleloader=insmod
fi
if ! list_search $modulename $MODULES ; then
shift
for suffix in $MODULE_SUFFIX ; do
modulefile=$MODULESDIR/${modulename}.${suffix}
if [ -f $modulefile ]; then
case $moduleloader in
insmod)
insmod $modulefile $*
;;
*)
modprobe $modulename $*
;;
esac
MODULES=$(lsmod | cut -d ' ' -f1)
break
fi
done
fi
}
#
# Reload the Modules
#
reload_kernel_modules() {
[ -z "$MODULESDIR" ] && MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv4/netfilter
MODULES=$(lsmod | cut -d ' ' -f1)
while read command; do
eval $command
done
}
#
# Load kernel modules required for Shorewall
#
load_kernel_modules()
{
save_modules_dir=$MODULESDIR
[ -z "$MODULESDIR" ] && \
MODULESDIR=/lib/modules/$(uname -r)/kernel/net/ipv4/netfilter
modules=$(find_file modules)
if [ -f $modules -a -d $MODULESDIR ]; then
MODULES=$(lsmod | cut -d ' ' -f1)
progress_message "Loading Modules..."
. $modules
fi
MODULESDIR=$save_modules_dir
}
#
# Call this function to assert mutual exclusion with Shorewall. If you invoke the
# /sbin/shorewall program while holding mutual exclusion, you should pass "nolock" as
# the first argument. Example "shorewall nolock refresh"
#
# This function uses the lockfile utility from procmail if it exists.
# Otherwise, it uses a somewhat race-prone algorithm to attempt to simulate the
# behavior of lockfile.
#
mutex_on()
{
local try=0
local lockf=${VARDIR}/lock
MUTEX_TIMEOUT=${MUTEX_TIMEOUT:-60}
if [ $MUTEX_TIMEOUT -gt 0 ]; then
[ -d ${VARDIR} ] || mkdir -p ${VARDIR}
if qt mywhich lockfile; then
lockfile -${MUTEX_TIMEOUT} -r1 ${lockf}
else
while [ -f ${lockf} -a ${try} -lt ${MUTEX_TIMEOUT} ] ; do
sleep 1
try=$((${try} + 1))
done
if [ ${try} -lt ${MUTEX_TIMEOUT} ] ; then
# Create the lockfile
echo $$ > ${lockf}
else
echo "Giving up on lock file ${lockf}" >&2
fi
fi
fi
}
#
# Call this function to release mutual exclusion
#
mutex_off()
{
rm -f ${VARDIR}/lock
}
#
# Determine which version of mktemp is present (if any) and set MKTEMP accortingly:
#
# None - No mktemp
# BSD - BSD mktemp (Mandrake)
# STD - mktemp.org mktemp
#
find_mktemp() {
local mktemp=`mywhich mktemp 2> /dev/null`
if [ -n "$mktemp" ]; then
if qt mktemp -V ; then
MKTEMP=STD
else
MKTEMP=BSD
fi
else
MKTEMP=None
fi
}
#
# create a temporary file. If a directory name is passed, the file will be created in
# that directory. Otherwise, it will be created in a temporary directory.
#
mktempfile() {
[ -z "$MKTEMP" ] && find_mktemp
if [ $# -gt 0 ]; then
case "$MKTEMP" in
BSD)
mktemp $1/shorewall.XXXXXX
;;
STD)
mktemp -p $1 shorewall.XXXXXX
;;
None)
> $1/shorewall-$$ && echo $1/shorewall-$$
;;
*)
error_message "ERROR:Internal error in mktempfile"
;;
esac
else
case "$MKTEMP" in
BSD)
mktemp /tmp/shorewall.XXXXXX
;;
STD)
mktemp -t shorewall.XXXXXX
;;
None)
rm -f /tmp/shorewall-$$
> /tmp/shorewall-$$ && echo /tmp/shorewall-$$
;;
*)
error_message "ERROR:Internal error in mktempfile"
;;
esac
fi
}
#
# create a temporary directory
#
mktempdir() {
[ -z "$MKTEMP" ] && find_mktemp
case "$MKTEMP" in
STD)
mktemp -td shorewall.XXXXXX
;;
None|BSD)
#
# Not all versions of the BSD mktemp support the -d option under Linux
#
qt rm -rf /tmp/shorewall-$$
mkdir -p /tmp/shorewall-$$ && chmod 700 /tmp/shorewall-$$ && echo /tmp/shorewall-$$
;;
*)
error_message "ERROR:Internal error in mktempdir"
;;
esac
}
#
# Read a file and handle "INCLUDE" directives
#
read_file() # $1 = file name, $2 = nest count
{
local first rest
if [ -f $1 ]; then
while read first rest; do
if [ "x$first" = "xINCLUDE" ]; then
if [ $2 -lt 4 ]; then
read_file $(find_file $(expand ${rest%#*})) $(($2 + 1))
else
error_message "WARNING: INCLUDE in $1 ignored (nested too deeply)"
fi
else
echo "$first $rest"
fi
done < $1
else
[ -n "$TERMINATOR" ] && $TERMINATOR "No such file: $1"
echo "WARNING -- No such file: $1"
fi
}
#
# Function for including one file into another
#
INCLUDE() {
. $(find_file $(expand $@))
}
#
# Strip comments and blank lines from a file and place the result in the
# temporary directory
#
strip_file() # $1 = Base Name of the file, $2 = Full Name of File (optional)
{
local fname
if [ ! -f $TMP_DIR/$1 ]; then
[ $# = 1 ] && fname=$(find_file $1) || fname=$2
if [ -f $fname ]; then
read_file $fname 0 | cut -d'#' -f1 | grep -v '^[[:space:]]*$' > $TMP_DIR/$1
else
> $TMP_DIR/$1
fi
fi
}
#
# Load an optional library
#
lib_load() # $1 = Name of the Library, $2 = Error Message heading if the library cannot be found
{
local lib=${SHAREDIR}/lib.$1
local loaded
eval loaded=\$LIB_${1}_LOADED
if [ -z "$loaded" ]; then
if [ -f $lib ]; then
. $lib
eval LIB_${1}_LOADED=Yes
else
startup_error "$2 requires the Shorewall library $1 ($lib) which is not installed"
fi
fi
}
#
# Determine if an optional library is available
#
lib_avail() # $1 = Name of the Library
{
[ -f ${SHAREDIR}/lib.$1 ]
}
strip_file_and_lib_load() # $1 = logical file name, $2 = library to load if the stripped file is non-empty
{
local f=$(find_file $1)
strip_file $1 $f
if [ -s $TMP_DIR/$1 ]; then
lib_load $2 "A non-empty $1 file ($f)"
return 0
fi
return 1
}
#
# Note: The following set of IP address manipulation functions have anomalous
# behavior when the shell only supports 32-bit signed arithmatic and
# the IP address is 128.0.0.0 or 128.0.0.1.
#
LEFTSHIFT='<<'
#
# Convert an IP address in dot quad format to an integer
#
decodeaddr() {
local x
local temp=0
local ifs=$IFS
IFS=.
for x in $1; do
temp=$(( $(( $temp $LEFTSHIFT 8 )) | $x ))
done
echo $temp
IFS=$ifs
}
#
# convert an integer to dot quad format
#
encodeaddr() {
addr=$1
local x
local y=$(($addr & 255))
for x in 1 2 3 ; do
addr=$(($addr >> 8))
y=$(($addr & 255)).$y
done
echo $y
}
#
# Enumerate the members of an IP range -- When using a shell supporting only
# 32-bit signed arithmetic, the range cannot span 128.0.0.0.
#
# Comes in two flavors:
#
# ip_range() - produces a mimimal list of network/host addresses that spans
# the range.
#
# ip_range_explicit() - explicitly enumerates the range.
#
ip_range() {
local first last l x y z vlsm
case $1 in
!*)
#
# Let iptables complain if it's a range
#
echo $1
return
;;
[0-9]*.*.*.*-*.*.*.*)
;;
*)
echo $1
return
;;
esac
first=$(decodeaddr ${1%-*})
last=$(decodeaddr ${1#*-})
if [ $first -gt $last ]; then
fatal_error "Invalid IP address range: $1"
fi
l=$(( $last + 1 ))
while [ $first -le $last ]; do
vlsm=
x=31
y=2
z=1
while [ $(( $first % $y )) -eq 0 -a $(( $first + $y )) -le $l ]; do
vlsm=/$x
x=$(( $x - 1 ))
z=$y
y=$(( $y * 2 ))
done
echo $(encodeaddr $first)$vlsm
first=$(($first + $z))
done
}
ip_range_explicit() {
local first last
case $1 in
[0-9]*.*.*.*-*.*.*.*)
;;
*)
echo $1
return
;;
esac
first=$(decodeaddr ${1%-*})
last=$(decodeaddr ${1#*-})
if [ $first -gt $last ]; then
fatal_error "Invalid IP address range: $1"
fi
while [ $first -le $last ]; do
echo $(encodeaddr $first)
first=$(($first + 1))
done
}
#
# Netmask from CIDR
#
ip_netmask() {
local vlsm=${1#*/}
[ $vlsm -eq 0 ] && echo 0 || echo $(( -1 $LEFTSHIFT $(( 32 - $vlsm )) ))
}
#
# Network address from CIDR
#
ip_network() {
local decodedaddr=$(decodeaddr ${1%/*})
local netmask=$(ip_netmask $1)
echo $(encodeaddr $(($decodedaddr & $netmask)))
}
#
# The following hack is supplied to compensate for the fact that many of
# the popular light-weight Bourne shell derivatives don't support XOR ("^").
#
ip_broadcast() {
local x=$(( 32 - ${1#*/} ))
[ $x -eq 0 ] && echo -1 || echo $(( $(( 1 $LEFTSHIFT $x )) - 1 ))
}
#
# Calculate broadcast address from CIDR
#
broadcastaddress() {
local decodedaddr=$(decodeaddr ${1%/*})
local netmask=$(ip_netmask $1)
local broadcast=$(ip_broadcast $1)
echo $(encodeaddr $(( $(($decodedaddr & $netmask)) | $broadcast )))
}
#
# Test for network membership
#
in_network() # $1 = IP address, $2 = CIDR network
{
local netmask=$(ip_netmask $2)
test $(( $(decodeaddr $1) & $netmask)) -eq $(( $(decodeaddr ${2%/*}) & $netmask ))
}
#
# Netmask to VLSM
#
ip_vlsm() {
local mask=$(decodeaddr $1)
local vlsm=0
local x=$(( 128 << 24 )) # 0x80000000
while [ $(( $x & $mask )) -ne 0 ]; do
[ $mask -eq $x ] && mask=0 || mask=$(( $mask $LEFTSHIFT 1 )) # Not all shells shift 0x80000000 left properly.
vlsm=$(($vlsm + 1))
done
if [ $(( $mask & 2147483647 )) -ne 0 ]; then # 2147483647 = 0x7fffffff
echo "Invalid net mask: $1" >&2
else
echo $vlsm
fi
}
#
# Chain name base for an interface -- replace all periods with underscores in the passed name.
# The result is echoed (less trailing "+").
#
chain_base() #$1 = interface
{
local c=${1%%+}
while true; do
case $c in
*.*)
c="${c%.*}_${c##*.}"
;;
*-*)
c="${c%-*}_${c##*-}"
;;
*%*)
c="${c%\%*}_${c##*%}"
;;
*)
echo ${c:=common}
return
;;
esac
done
}
#
# Query NetFilter about the existence of a filter chain
#
chain_exists() # $1 = chain name
{
qt $IPTABLES -L $1 -n
}
#
# Loosly Match the name of an interface
#
if_match() # $1 = Name in interfaces file - may end in "+"
# $2 = Full interface name - may also end in "+"
{
local pattern=${1%+}
case $1 in
*+)
test "x$(echo $2 | truncate ${#pattern} )" = "x${pattern}"
;;
*)
test "x$1" = "x$2"
;;
esac
}
#
# Source IP range
#
source_ip_range() # $1 = Address or Address Range
{
[ $# -gt 0 ] && case $1 in
*.*.*.*-*.*.*.*)
case $1 in
!*)
iprange_echo "! --src-range ${1#!}"
;;
*)
iprange_echo "--src-range $1"
;;
esac
;;
!+*)
echo "-m set ! $(get_set_flags ${1#!} src)"
;;
+*)
echo "-m set $(get_set_flags $1 src)"
;;
*)
echo "-s $1"
;;
esac
}
#
# Destination IP range
#
dest_ip_range() # $1 = Address or Address Range
{
[ $# -gt 0 ] && case $1 in
*.*.*.*-*.*.*.*)
case $1 in
!*)
iprange_echo "! --dst-range ${1#!}"
;;
*)
iprange_echo "--dst-range $1"
;;
esac
;;
!+*)
echo "-m set ! $(get_set_flags ${1#!} dst)"
;;
+*)
echo "-m set $(get_set_flags $1 dst)"
;;
*)
echo "-d $1"
;;
esac
}
both_ip_ranges() # $1 = Source address or range, $2 = dest address or range
{
local rangeprefix= setprefix= rangematch= setmatch=
case $1 in
*.*.*.*-*.*.*.*)
rangeprefix="-m iprange"
rangematch="--src-range $1"
;;
!+*)
setprefix="-m set"
setmatch="! $(get_set_flags ${1#!} src)"
;;
+*)
setprefix="-m set"
setmatch="$(get_set_flags $1 src)"
;;
*)
rangematch="-s $1"
;;
esac
case $2 in
*.*.*.*-*.*.*.*)
rangeprefix="-m iprange"
rangematch="$rangematch --dst-range $2"
;;
!+*)
setprefix="-m set"
match="$setmatch ! $(get_set_flags ${2#!} dst)"
;;
+*)
setprefix="-m set"
setmatch="$setmatch $(get_set_flags $2 dst)"
;;
*)
rangematch="$rangematch -d $2"
;;
esac
echo "$rangeprefix $rangematch $setprefix $setmatch"
}
#
# Find the value 'dev' in the passed arguments then echo the next value
#
find_device() {
while [ $# -gt 1 ]; do
[ "x$1" = xdev ] && echo $2 && return
shift
done
}
#
# Find the value 'via' in the passed arguments then echo the next value
#
find_gateway() {
while [ $# -gt 1 ]; do
[ "x$1" = xvia ] && echo $2 && return
shift
done
}
#
# Find the value 'mtu' in the passed arguments then echo the next value
#
find_mtu() {
while [ $# -gt 1 ]; do
[ "x$1" = xmtu ] && echo $2 && return
shift
done
}
#
# Find the value 'peer' in the passed arguments then echo the next value up to
# "/"
#
find_peer() {
while [ $# -gt 1 ]; do
[ "x$1" = xpeer ] && echo ${2%/*} && return
shift
done
}
#
# Find the interfaces that have a route to the passed address - the default
# route is not used.
#
find_rt_interface() {
ip route ls | while read addr rest; do
case $addr in
*/*)
in_network ${1%/*} $addr && echo $(find_device $rest)
;;
default)
;;
*)
if [ "$addr" = "$1" -o "$addr/32" = "$1" ]; then
echo $(find_device $rest)
fi
;;
esac
done
}
#
# Try to find the gateway through an interface looking for 'nexthop'
find_nexthop() # $1 = interface
{
echo $(find_gateway `ip route ls | grep "[[:space:]]nexthop.* $1"`)
}
#
# Find the default route's interface
#
find_default_interface() {
ip route ls | while read first rest; do
[ "$first" = default ] && echo $(find_device $rest) && return
done
}
#
# Echo the name of the interface(s) that will be used to send to the
# passed address
#
find_interface_by_address() {
local dev="$(find_rt_interface $1)"
local first rest
[ -z "$dev" ] && dev=$(find_default_interface)
[ -n "$dev" ] && echo $dev
}
#
# Find the interface with the passed MAC address
#
find_interface_by_mac() {
local mac=$1 first second rest dev
ip link ls | while read first second rest; do
case $first in
*:)
dev=$second
;;
*)
if [ "$second" = $mac ]; then
echo ${dev%:}
return
fi
esac
done
}
#
# Determine if Interface is up
#
interface_is_up() {
[ -n "$(ip link ls dev $1 | grep -e '[<,]UP[,>]')" ]
}
#
# Find interface address--returns the first IP address assigned to the passed
# device
#
find_first_interface_address() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$(ip -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
#
# If there wasn't one, bail out now
#
[ -n "$addr" ] || fatal_error "Can't determine the IP address of $1"
#
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
# along with everything else on the line
#
echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//'
}
find_first_interface_address_if_any() # $1 = interface
{
#
# get the line of output containing the first IP address
#
addr=$(ip -f inet addr show $1 2> /dev/null | grep 'inet .* global' | head -n1)
#
# Strip off the trailing VLSM mask (or the peer IP in case of a P-t-P link)
# along with everything else on the line
#
[ -n "$addr" ] && echo $addr | sed 's/\s*inet //;s/\/.*//;s/ peer.*//' || echo 0.0.0.0
}
#
# Find interface addresses--returns the set of addresses assigned to the passed
# device
#
find_interface_addresses() # $1 = interface
{
ip -f inet addr show $1 | grep inet\ | sed 's/\s*inet //;s/\/.*//;s/ peer.*//'
}
#
# echo the list of networks routed out of a given interface
#
get_routed_networks() # $1 = interface name, $2-n = Fatal error message
{
local address
local rest
ip route show dev $1 2> /dev/null |
while read address rest; do
if [ "x$address" = xdefault ]; then
if [ $# -gt 1 ]; then
shift
fatal_error "$@"
else
"WARNING: default route ignored on interface $1"
fi
else
[ "$address" = "${address%/*}" ] && address="${address}/32"
echo $address
fi
done
}
#
# Internal version of 'which'
#
mywhich() {
local dir
for dir in $(split $PATH); do
if [ -x $dir/$1 ]; then
echo $dir/$1
return 0
fi
done
return 2
}
#
# Set the Shorewall state
#
set_state () # $1 = state
{
echo "$1 ($(date))" > ${VARDIR}/state
}
#
# Determine which optional facilities are supported by iptables/netfilter
#
determine_capabilities() {
qt $IPTABLES -t nat -L -n && NAT_ENABLED=Yes || NAT_ENABLED=
qt $IPTABLES -t mangle -L -n && MANGLE_ENABLED=Yes || MANGLE_ENABLED=
CONNTRACK_MATCH=
MULTIPORT=
XMULTIPORT=
POLICY_MATCH=
PHYSDEV_MATCH=
IPRANGE_MATCH=
RECENT_MATCH=
OWNER_MATCH=
IPSET_MATCH=
CONNMARK=
XCONNMARK=
CONNMARK_MATCH=
XCONNMARK_MATCH=
RAW_TABLE=
IPP2P_MATCH=
LENGTH_MATCH=
CLASSIFY_TARGET=
ENHANCED_REJECT=
USEPKTTYPE=
KLUDGEFREE=
MARK=
XMARK=
MANGLE_FORWARD=
qt $IPTABLES -N fooX1234
qt $IPTABLES -A fooX1234 -m conntrack --ctorigdst 192.168.1.1 -j ACCEPT && CONNTRACK_MATCH=Yes
qt $IPTABLES -A fooX1234 -p tcp -m multiport --dports 21,22 -j ACCEPT && MULTIPORT=Yes
qt $IPTABLES -A fooX1234 -p tcp -m multiport --dports 21:22 -j ACCEPT && XMULTIPORT=Yes
qt $IPTABLES -A fooX1234 -m policy --pol ipsec --mode tunnel --dir in -j ACCEPT && POLICY_MATCH=Yes
if qt $IPTABLES -A fooX1234 -m physdev --physdev-in eth0 -j ACCEPT; then
PHYSDEV_MATCH=Yes
fi
if qt $IPTABLES -A fooX1234 -m iprange --src-range 192.168.1.5-192.168.1.124 -j ACCEPT; then
IPRANGE_MATCH=Yes
if [ -z "${KLUDGEFREE}" ]; then
qt $IPTABLES -A fooX1234 -m iprange --src-range 192.168.1.5-192.168.1.124 -m iprange --dst-range 192.168.1.5-192.168.1.124 -j ACCEPT && KLUDGEFREE=Yes
fi
fi
qt $IPTABLES -A fooX1234 -m recent --update -j ACCEPT && RECENT_MATCH=Yes
qt $IPTABLES -A fooX1234 -m owner --uid-owner 0 -j ACCEPT && OWNER_MATCH=Yes
if qt $IPTABLES -A fooX1234 -m connmark --mark 2 -j ACCEPT; then
CONNMARK_MATCH=Yes
qt $IPTABLES -A fooX1234 -m connmark --mark 2/0xFF -j ACCEPT && XCONNMARK_MATCH=Yes
fi
qt $IPTABLES -A fooX1234 -p tcp -m ipp2p --ipp2p -j ACCEPT && IPP2P_MATCH=Yes
qt $IPTABLES -A fooX1234 -m length --length 10:20 -j ACCEPT && LENGTH_MATCH=Yes
qt $IPTABLES -A fooX1234 -j REJECT --reject-with icmp-host-prohibited && ENHANCED_REJECT=Yes
if [ -n "$MANGLE_ENABLED" ]; then
qt $IPTABLES -t mangle -N fooX1234
if qt $IPTABLES -t mangle -A fooX1234 -j MARK --set-mark 1; then
MARK=Yes
qt $IPTABLES -t mangle -A fooX1234 -j MARK --and-mark 0xFF && XMARK=Yes
fi
if qt $IPTABLES -t mangle -A fooX1234 -j CONNMARK --save-mark; then
CONNMARK=Yes
qt $IPTABLES -t mangle -A fooX1234 -j CONNMARK --save-mark --mask 0xFF && XCONNMARK=Yes
fi
qt $IPTABLES -t mangle -A fooX1234 -j CLASSIFY --set-class 1:1 && CLASSIFY_TARGET=Yes
qt $IPTABLES -t mangle -F fooX1234
qt $IPTABLES -t mangle -X fooX1234
qt $IPTABLES -t mangle -L FORWARD -n && MANGLE_FORWARD=Yes
fi
qt $IPTABLES -t raw -L -n && RAW_TABLE=Yes
if qt mywhich ipset; then
qt ipset -X fooX1234 # Just in case something went wrong the last time
if qt ipset -N fooX1234 iphash ; then
if qt $IPTABLES -A fooX1234 -m set --set fooX1234 src -j ACCEPT; then
qt $IPTABLES -D fooX1234 -m set --set fooX1234 src -j ACCEPT
IPSET_MATCH=Yes
fi
qt ipset -X fooX1234
fi
fi
qt $IPTABLES -A fooX1234 -m pkttype --pkt-type broadcast -j ACCEPT && USEPKTTYPE=Yes
qt $IPTABLES -F fooX1234
qt $IPTABLES -X fooX1234
}
report_capabilities() {
report_capability() # $1 = Capability Description , $2 Capability Setting (if any)
{
local setting=
[ "x$2" = "xYes" ] && setting="Available" || setting="Not available"
echo " " $1: $setting
}
if [ $VERBOSE -gt 1 ]; then
echo "Shorewall has detected the following iptables/netfilter capabilities:"
report_capability "NAT" $NAT_ENABLED
report_capability "Packet Mangling" $MANGLE_ENABLED
report_capability "Multi-port Match" $MULTIPORT
[ -n "$MULTIPORT" ] && report_capability "Extended Multi-port Match" $XMULTIPORT
report_capability "Connection Tracking Match" $CONNTRACK_MATCH
report_capability "Packet Type Match" $USEPKTTYPE
report_capability "Policy Match" $POLICY_MATCH
report_capability "Physdev Match" $PHYSDEV_MATCH
report_capability "Packet length Match" $LENGTH_MATCH
report_capability "IP range Match" $IPRANGE_MATCH
report_capability "Recent Match" $RECENT_MATCH
report_capability "Owner Match" $OWNER_MATCH
report_capability "Ipset Match" $IPSET_MATCH
report_capability "CONNMARK Target" $CONNMARK
[ -n "$CONNMARK" ] && report_capability "Extended CONNMARK Target" $XCONNMARK
report_capability "Connmark Match" $CONNMARK_MATCH
[ -n "$CONNMARK_MATCH" ] && report_capability "Extended Connmark Match" $XCONNMARK_MATCH
report_capability "Raw Table" $RAW_TABLE
report_capability "IPP2P Match" $IPP2P_MATCH
report_capability "CLASSIFY Target" $CLASSIFY_TARGET
report_capability "Extended REJECT" $ENHANCED_REJECT
report_capability "Repeat match" $KLUDGEFREE
report_capability "MARK Target" $MARK
[ -n "$MARK" ] && report_capability "Extended MARK Target" $XMARK
report_capability "Mangle FORWARD Chain" $MANGLE_FORWARD
fi
[ -n "$PKTTYPE" ] || USEPKTTYPE=
}
report_capabilities1() {
report_capability1() # $1 = Capability
{
eval echo $1=\$$1
}
echo "#"
echo "# Shorewall $VERSION detected the following iptables/netfilter capabilities - $(date)"
echo "#"
report_capability1 NAT_ENABLED
report_capability1 MANGLE_ENABLED
report_capability1 MULTIPORT
report_capability1 XMULTIPORT
report_capability1 CONNTRACK_MATCH
report_capability1 USEPKTTYPE
report_capability1 POLICY_MATCH
report_capability1 PHYSDEV_MATCH
report_capability1 LENGTH_MATCH
report_capability1 IPRANGE_MATCH
report_capability1 RECENT_MATCH
report_capability1 OWNER_MATCH
report_capability1 IPSET_MATCH
report_capability1 CONNMARK
report_capability1 XCONNMARK
report_capability1 CONNMARK_MATCH
report_capability1 XCONNMARK_MATCH
report_capability1 RAW_TABLE
report_capability1 IPP2P_MATCH
report_capability1 CLASSIFY_TARGET
report_capability1 ENHANCED_REJECT
report_capability1 KLUDGEFREE
report_capability1 MARK
report_capability1 XMARK
report_capability1 MANGLE_FORWARD
}
#
# Delete IP address
#
del_ip_addr() # $1 = address, $2 = interface
{
[ $(find_first_interface_address_if_any $2) = $1 ] || qt ip addr del $1 dev $2
}
# Add IP Aliases
#
add_ip_aliases() # $* = List of addresses
{
local addresses external interface inet cidr rest val arping=$(mywhich arping)
address_details()
{
#
# Folks feel uneasy if they don't see all of the same
# decoration on these IP addresses that they see when their
# distro's net config tool adds them. In an attempt to reduce
# the anxiety level, we have the following code which sets
# the VLSM and BRD from an existing address in the same networks
#
# Get all of the lines that contain inet addresses with broadcast
#
ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | while read inet cidr rest ; do
case $cidr in
*/*)
if in_network $external $cidr; then
echo "/${cidr#*/} brd $(broadcastaddress $cidr)"
break
fi
;;
esac
done
}
do_one()
{
val=$(address_details)
ip addr add ${external}${val} dev $interface $label
[ -n "$arping" ] && qt $arping -U -c 2 -I $interface $external
echo "$external $interface" >> $STATEDIR/nat
[ -n "$label" ] && label="with $label"
progress_message " IP Address $external added to interface $interface $label"
}
progress_message "Adding IP Addresses..."
while [ $# -gt 0 ]; do
external=$1
interface=$2
label=
if [ "$interface" != "${interface%:*}" ]; then
label="${interface#*:}"
interface="${interface%:*}"
label="label $interface:$label"
fi
shift 2
list_search $external $(find_interface_addresses $interface) || do_one
done
}
detect_gateway() # $1 = interface
{
local interface=$1
#
# First assume that this is some sort of point-to-point interface
#
gateway=$( find_peer $(ip addr ls $interface ) )
#
# Maybe there's a default route through this gateway already
#
[ -n "$gateway" ] || gateway=$(find_gateway $(ip route ls dev $interface))
#
# Last hope -- is there a load-balancing route through the interface?
#
[ -n "$gateway" ] || gateway=$(find_nexthop $interface)
#
# Be sure we found one
#
[ -n "$gateway" ] && echo $gateway
}
#
# Disable IPV6
#
disable_ipv6() {
local foo="$(ip -f inet6 addr ls 2> /dev/null)"
if [ -n "$foo" ]; then
if qt mywhich ip6tables; then
ip6tables -P FORWARD DROP
ip6tables -P INPUT DROP
ip6tables -P OUTPUT DROP
ip6tables -F
ip6tables -X
ip6tables -A OUTPUT -o lo -j ACCEPT
ip6tables -A INPUT -i lo -j ACCEPT
else
error_message "WARNING: DISABLE_IPV6=Yes in shorewall.conf but this system does not appear to have ip6tables"
fi
fi
}
#
# Add a logging rule.
#
log_rule_limit() # $1 = log level, $2 = chain, $3 = display Chain $4 = disposition , $5 = rate limit $6=log tag $7=command $... = predicates for the rule
{
local level=$1
local chain=$2
local displayChain=$3
local disposition=$4
local rulenum=
local limit=
local tag=${6:+$6 }
local command=${7:--A}
local prefix
local base=$(chain_base $displayChain)
limit="${5:-$LOGLIMIT}" # Do this here rather than in the declaration above to appease /bin/ash.
shift 7
if [ -n "$tag" -a -n "$LOGTAGONLY" ]; then
displayChain=$tag
tag=
fi
if [ -n "$LOGRULENUMBERS" ]; then
eval rulenum=\$${base}_logrules
rulenum=${rulenum:-1}
prefix="$(printf "$LOGFORMAT" $displayChain $rulenum $disposition)${tag}"
rulenum=$(($rulenum + 1))
eval ${base}_logrules=$rulenum
else
prefix="$(printf "$LOGFORMAT" $displayChain $disposition)${tag}"
fi
if [ ${#prefix} -gt 29 ]; then
prefix="$(echo $prefix | truncate 29)"
error_message "WARNING: Log Prefix shortened to \"$prefix\""
fi
[ "$PROGRAM" = compiler ] && prefix="\"$prefix\""
case $level in
ULOG)
run_iptables $command $chain $@ $limit -j ULOG $LOGPARMS --ulog-prefix "$prefix"
;;
*)
run_iptables $command $chain $@ $limit -j LOG $LOGPARMS --log-level $level --log-prefix "$prefix"
;;
esac
if [ $? -ne 0 ] ; then
[ -z "$STOPPING" ] && { stop_firewall; exit 2; }
fi
}
log_rule() # $1 = log level, $2 = chain, $3 = disposition , $... = predicates for the rule
{
local level=$1
local chain=$2
local disposition=$3
shift 3
log_rule_limit $level $chain $chain $disposition "$LOGLIMIT" "" -A $@
}
#
# Check that a mark value or mask is less that 256 or that it is less than 65536 and
# that it's lower 8 bits are zero.
#
verify_mark() # $1 = value to test
{
verify_mark2()
{
case $1 in
0*)
[ $(($1)) -lt 256 ] && return 0
[ -n "$HIGH_ROUTE_MARKS" ] || return 1
[ $(($1)) -gt 65535 ] && return 1
return $(($1 & 0xFF))
;;
[1-9]*)
[ $1 -lt 256 ] && return 0
[ -n "$HIGH_ROUTE_MARKS" ] || return 1
[ $1 -gt 65535 ] && return 1
return $(($1 & 0xFF))
;;
*)
return 2
;;
esac
}
verify_mark2 $1 || fatal_error "Invalid Mark or Mask value: $1"
}
#
# Detect a device's MTU
#
get_device_mtu() # $1 = device
{
local output="$(ip link ls dev $1 2> /dev/null)" # quotes required for /bin/ash
if [ -n "$output" ]; then
echo $(find_mtu $output)
else
echo 1500
fi
}
delete_tc1()
{
clear_one_tc() {
tc qdisc del dev $1 root 2> /dev/null
tc qdisc del dev $1 ingress 2> /dev/null
}
run_user_exit tcclear
run_ip link list | \
while read inx interface details; do
case $inx in
[0-9]*)
clear_one_tc ${interface%:}
;;
*)
;;
esac
done
}
#
# Determine the value for a parameter that defaults to Yes
#
added_param_value_yes() # $1 = Parameter Name, $2 = Parameter value
{
local val="$2"
if [ -z "$val" ]; then
echo "Yes"
else case $val in
[Yy][Ee][Ss])
echo "Yes"
;;
[Nn][Oo])
echo ""
;;
*)
startup_error "Invalid value ($val) for $1"
;;
esac
fi
}
#
# Determine the value for a parameter that defaults to No
#
added_param_value_no() # $1 = Parameter Name, $2 = Parameter value
{
local val="$2"
if [ -z "$val" ]; then
echo ""
else case $val in
[Yy][Ee][Ss])
echo "Yes"
;;
[Nn][Oo])
echo ""
;;
*)
startup_error "Invalid value ($val) for $1"
;;
esac
fi
}
#
# Initialize this program
#
do_initialize() {
# Run all utility programs using the C locale
#
# Thanks to Vincent Planchenault for this tip #
export LC_ALL=C
# Make sure umask is sane
umask 077
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/sbin:/usr/local/bin
#
# Establish termination function
#
TERMINATOR=fatal_error
#
# Clear all configuration variables
#
VERSION=
IPTABLES=
FW=
SUBSYSLOCK=
ALLOWRELATED=Yes
LOGRATE=
LOGBURST=
LOGPARMS=
LOGLIMIT=
ADD_IP_ALIASES=
ADD_SNAT_ALIASES=
TC_ENABLED=
BLACKLIST_DISPOSITION=
BLACKLIST_LOGLEVEL=
CLAMPMSS=
ROUTE_FILTER=
LOG_MARTIANS=
DETECT_DNAT_IPADDRS=
MUTEX_TIMEOUT=
FORWARDPING=
MACLIST_DISPOSITION=
MACLIST_LOG_LEVEL=
TCP_FLAGS_DISPOSITION=
TCP_FLAGS_LOG_LEVEL=
RFC1918_LOG_LEVEL=
MARK_IN_FORWARD_CHAIN=
VERSION_FILE=
LOGFORMAT=
LOGRULENUMBERS=
ADMINISABSENTMINDED=
BLACKLISTNEWONLY=
MODULE_SUFFIX=
ACTIONS=
USEDACTIONS=
SMURF_LOG_LEVEL=
DISABLE_IPV6=
BRIDGING=
DYNAMIC_ZONES=
PKTTYPE=
USEPKTYPE=
RETAIN_ALIASES=
DELAYBLACKLISTLOAD=
LOGTAGONLY=
LOGALLNEW=
RFC1918_STRICT=
MACLIST_TTL=
SAVE_IPSETS=
RESTOREFILE=
MAPOLDACTIONS=
IMPLICIT_CONTINUE=
HIGH_ROUTE_MARKS=
TC_EXPERT=
OUTPUT=
TMP_DIR=
ALL_INTERFACES=
ROUTEMARK_INTERFACES=
IPSECMARK=256
PROVIDERS=
CRITICALHOSTS=
IPSECFILE=
EXCLUSION_SEQ=1
STOPPING=
HAVE_MUTEX=
ALIASES_TO_ADD=
SECTION=ESTABLISHED
SECTIONS=
ALL_PORTS=
TMP_DIR=$(mktempdir)
[ -n "$TMP_DIR" ] && chmod 700 $TMP_DIR || \
fatal_error "Can't create a temporary directory"
case $PROGRAM in
compiler)
trap "[ -n "$OUTPUT" ] && rm -f $OUTPUT;rm -rf $TMP_DIR; exit 2" 1 2 3 4 5 6 9
;;
firewall)
trap "[ -n "$RESTOREBASE" ] && rm -f $RESTOREBASE;rm -rf $TMP_DIR; my_mutex_off; exit 2" 1 2 3 4 5 6 9
;;
esac
ensure_config_path
VERSION_FILE=$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 $BRIDGING)
DYNAMIC_ZONES=$(added_param_value_no DYNAMIC_ZONES $DYNAMIC_ZONES)
if [ -n "$DYNAMIC_ZONES" ]; then
[ -n "$EXPORT" ] && fatal_error "DYNAMIC_ZONES=Yes is incompatible with the -e option"
lib_avail dynamiczones || error_message "WARNING: DYNAMIC_ZONES=Yes requires the Shorewall dynamiczones library (${SHAREDIR}/lib.dynamiczones) which is not installed"
fi
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 $HIGH_ROUTE_MARKS)
TC_EXPERT=$(added_param_value_no TC_EXPERT $TC_EXPERT)
[ -n "$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="$PWD"
[ -n "${RESTOREFILE:=restore}" ]
#
# 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=
}
SHOREWALL_LIBRARY=Loaded
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