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shorewall_code/Shorewall/shorewall

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#!/bin/sh
#
# Shorewall Packet Filtering Firewall Control Program - V1.3 - 6/14/2002
#
# This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]
#
# (c) 1999,2000,2001,2002 - Tom Eastep (teastep@shorewall.net)
#
#
# This file should be placed in /sbin/shorewall.
#
# Shorewall documentation is available at http://shorewall.sourceforge.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.
#
# The firewall uses configuration files in /etc/shorewall/ - skeleton
# files is included with the firewall.
#
# Commands are:
#
# shorewall add <iface>[:<host>] zone Adds a host or subnet to a zone
# shorewall delete <iface>[:<host>] zone Deletes a host or subnet from a zone
# shorewall start Starts the firewall
# shorewall restart Restarts the firewall
# shorewall stop Stops the firewall
# shorewall monitor [ refresh-interval ] Repeatedly Displays firewall status
# plus the last 20 "interesting"
# packets
# shorewall status Displays firewall status
# shorewall reset Resets iptables packet and
# byte counts
# shorewall clear Open the floodgates by
# removing all iptables rules
# and setting the three permanent
# chain policies to ACCEPT
# shorewall refresh Rebuild the common chain to
# compensate for a change of
# broadcast address on any "detect"
# interface.
# shorewall show <chain> Display the rules in a <chain>
# shorewall show log Print the last 20 log messages
# shorewall show connections Show the kernel's connection
# tracking table
# shorewall show nat Display the rules in the nat table
# shorewall show {mangle|tos} Display the rules in the mangle table
# shorewall show tc Display traffic control info
# shorewall version Display the installed version id
# shorewall check Verify the more heavily-used
# configuration files.
# shorewall try <directory> [ <timeout> ] Try a new configuration and if
# it doesn't work, revert to the
# standard one. If a timeout is supplied
# the command reverts back to the
# standard configuration after that many
# seconds have elapsed after successfully
# starting the new configuration.
# shorewall logwatch [ refresh-interval ] Monitor the local log for Shorewall
# messages.
# shorewall drop <address> ... Temporarily drop all packets from the
# listed address(es)
# shorewall reject <address> ... Temporarily reject all packets from the
# listed address(es)
# shorewall allow <address> ... Reenable address(es) previously
# disabled with "drop" or "reject"
# shorewall save Save the list of "rejected" and
# "dropped" addresses so that it will
# be automatically reinstated the
# next time that Shorewall starts.
#
# Display a chain if it exists
#
showfirstchain() # $1 = name of chain
{
awk \
'BEGIN {prnt=0; rslt=1; }; \
/^$/ { next; };\
/^Chain/ {if ( prnt == 1 ) { rslt=0; exit 0; }; };\
/Chain '$1'/ { prnt=1; }; \
{ if (prnt == 1) print; };\
END { exit rslt; }' /tmp/chains-$$
}
showchain() # $1 = name of chain
{
if [ "$firstchain" = "Yes" ]; then
if showfirstchain $1; then
firstchain=
fi
else
awk \
'BEGIN {prnt=0;};\
/^$|^ pkts/ { next; };\
/^Chain/ {if ( prnt == 1 ) exit; };\
/Chain '$1'/ { prnt=1; };\
{ if (prnt == 1) print; }' /tmp/chains-$$
fi
}
#
# Set the configuration variables from shorewall.conf
#
get_config() {
[ -z "$LOGFILE" ] && LOGFILE=/var/log/messages
if [ ! -f $LOGFILE ]; then
echo "LOGFILE ($LOGFILE) does not exist!" >&2
exit 2
fi
#
# See if we have a real version of "tail" -- use separate redirection so
# that ash (aka /bin/sh on LRP) doesn't crap
#
if ( tail -n5 $LOGFILE > /dev/null 2> /dev/null ) ; then
realtail="Yes"
else
realtail=""
fi
[ -n "$FW" ] || FW=fw
}
#
# Display IPTABLES rules -- we used to store them in a variable but ash
# dies when trying to display large sets of rules
#
display_chains()
{
trap "rm -f /tmp/chains-$$; exit 1" 1 2 3 4 5 6 9
if [ "$haveawk" = "Yes" ]; then
#
# Send the output to a temporary file since ash craps if we try to store
# the output in a variable.
#
iptables -L -n -v > /tmp/chains-$$
clear
echo -e "$banner `date`\\n"
echo -e "Standard Chains\\n"
firstchain="Yes"
showchain INPUT
showchain OUTPUT
showchain FORWARD
timed_read
clear
echo -e "$banner `date`\\n"
firstchain=Yes
echo -e "Input Chains\\n"
chains=`grep '^Chain.*_[in|fwd]' /tmp/chains-$$ | cut -d' ' -f 2`
for chain in $chains; do
showchain $chain
done
timed_read
for zone in $zones; do
if [ -n "`grep "^Chain \.*${zone}" /tmp/chains-$$`" ] ; then
clear
echo -e "$banner `date`\\n"
firstchain=Yes
eval display=\$${zone}_display
echo -e "$display Chains\\n"
for zone1 in $FW $zones; do
showchain ${zone}2$zone1
showchain @${zone}2$zone1
[ "$zone" != "$zone1" ] && \
showchain ${zone1}2${zone} && \
showchain @${zone1}2${zone}
done
timed_read
fi
done
clear
echo -e "$banner `date`\\n"
firstchain=Yes
echo -e "Policy Chains\\n"
showchain common
showchain badpkt
showchain icmpdef
showchain rfc1918
showchain blacklst
showchain reject
showchain newnotsyn
for zone in $zones all; do
showchain ${zone}2all
showchain @${zone}2all
[ "$zone" = "all" ] || { showchain all2${zone}; showchain @all2${zone}; }
done
timed_read
clear
echo -e "$banner `date`\\n"
firstchain=Yes
echo -e "Dynamic Chain\\n"
showchain dynamic
timed_read
qt rm -f /tmp/chains-$$
else
iptables -L -n -v
timed_read
fi
trap - 1 2 3 4 5 6 9
}
#
# Delay $timeout seconds -- if we're running on a recent bash2 then allow
# <enter> to terminate the delay
#
timed_read ()
{
read -t $timeout foo 2> /dev/null
test $? -eq 2 && sleep $timeout
}
#
# Display the last $1 packets logged
#
packet_log() # $1 = number of messages
{
local options
[ -n "$realtail" ] && options="-n$1"
grep 'Shorewall:\|ipt_unclean' $LOGFILE | \
sed s/" $host kernel: Shorewall:"/" "/ | \
sed s/" $host kernel: ipt_unclean: "/" "/ | \
sed 's/MAC=.*SRC=/SRC=/' | \
tail $options
}
#
# Show traffic control information
#
show_tc() {
show_one_tc() {
local device=${1%@*}
qdisc=`tc qdisc list dev $device`
if [ -n "$qdisc" ]; then
echo Device $device:
tc -s -d qdisc show dev $device
tc -s -d class show dev $device
echo
fi
}
ip link list | \
while read inx interface details; do
case $inx in
[0-9]*)
show_one_tc ${interface%:}
;;
*)
;;
esac
done
}
#
# Monitor the Firewall
#
monitor_firewall() # $1 = timeout -- if negative, prompt each time that
# an 'interesting' packet count changes
{
get_config
host=`echo $HOSTNAME | sed 's/\..*$//'`
oldrejects=`iptables -L -v -n | grep 'LOG'`
if [ $1 -lt 0 ]; then
let "timeout=- $1"
pause="Yes"
else
pause="No"
timeout=$1
fi
qt which awk && { haveawk=Yes; determine_zones; } || haveawk=
while true; do
display_chains
clear
echo -e "$banner `date`\\n"
echo -e "Dropped/Rejected Packet Log\\n"
show_reset
rejects=`iptables -L -v -n | grep 'LOG'`
if [ "$rejects" != "$oldrejects" ]; then
oldrejects="$rejects"
echo -e '\a'
packet_log 20
if [ "$pause" = "Yes" ]; then
echo -en '\nEnter any character to continue: '
read foo
else
timed_read
fi
else
echo
packet_log 20
timed_read
fi
clear
echo -e "$banner `date`\\n"
echo -e "NAT Status\\n"
iptables -t nat -L -n -v
timed_read
clear
echo -e "$banner `date`\\n"
echo -e "\\nTOS/MARK Status\\n"
iptables -t mangle -L -n -v
timed_read
clear
echo -e "$banner `date`\\n"
echo -e "\\nTracked Connections\\n"
cat /proc/net/ip_conntrack
timed_read
clear
echo -e "$banner `date`\\n"
echo -e "\\nTraffic Shaping/Control\\n"
show_tc
timed_read
done
}
#
# Watch the Firewall Log
#
logwatch() # $1 = timeout -- if negative, prompt each time that
# an 'interesting' packet count changes
{
get_config
host=`echo $HOSTNAME | sed 's/\..*$//'`
oldrejects=`iptables -L -v -n | grep 'LOG'`
if [ $1 -lt 0 ]; then
timeout=$((- $1))
pause="Yes"
else
pause="No"
timeout=$1
fi
qt which awk && haveawk=Yes || haveawk=
while true; do
clear
echo -e "$banner `date`\\n"
echo -e "Dropped/Rejected Packet Log\\n"
show_reset
rejects=`iptables -L -v -n | grep 'LOG'`
if [ "$rejects" != "$oldrejects" ]; then
oldrejects="$rejects"
echo -e '\a'
packet_log 40
if [ "$pause" = "Yes" ]; then
echo -en '\nEnter any character to continue: '
read foo
else
timed_read
fi
else
echo
packet_log 40
timed_read
fi
done
}
#
# Give Usage Information
#
usage() # $1 = exit status
{
echo "Usage: `basename $0` [debug] [nolock] [-c <directory>] <command>"
echo "where <command> is one of:"
echo " add <interface>[:<host>] <zone>"
echo " delete <interface>[:<host>] <zone>"
echo " show [<chain>|connections|log|nat|tc|tos]"
echo " start"
echo " stop"
echo " reset"
echo " restart"
echo " status"
echo " clear"
echo " refresh"
echo " hits"
echo " monitor [<refresh interval>]"
echo " version"
echo " check"
echo " try <directory> [ <timeout> ]"
echo " logwatch [<refresh interval>]"
echo " drop <address> ..."
echo " reject <address> ..."
echo " allow <address> ..."
echo " save"
exit $1
}
#
# Display the time that the counters were last reset
#
show_reset() {
[ -f $STATEDIR/restarted ] && \
echo -e "Counters reset `cat $STATEDIR/restarted`\\n"
}
#
# Execution begins here
#
debugging=
if [ $# -gt 0 ] && [ "$1" = "debug" ]; then
debugging=debug
shift
fi
nolock=
if [ $# -gt 0 ] && [ "$1" = "nolock" ]; then
nolock=nolock
shift
fi
SHOREWALL_DIR=
done=0
while [ $done -eq 0 ]; do
[ $# -eq 0 ] && usage 1
case $1 in
-c)
[ $# -eq 1 ] && usage 1
if [ ! -d $2 ]; then
if [ -e $2 ]; then
echo "$2 is not a directory" >&2 && exit 2
else
echo "Directory $2 does not exist" >&2 && exit 2
fi
fi
SHOREWALL_DIR=$2
shift
shift
;;
*)
done=1
;;
esac
done
if [ $# -eq 0 ]; then
usage 1
fi
[ -n "$SHOREWALL_DIR" ] && export SHOREWALL_DIR
functions=/usr/lib/shorewall/functions
if [ -f $functions ]; then
. $functions
else
echo "$functions does not exist!" >&2
exit 2
fi
firewall=/usr/lib/shorewall/firewall
if [ ! -f $firewall ]; then
echo "ERROR: Shorewall is not properly installed"
if [ -L $firewall ]; then
echo " $firewall is a symbolic link to a"
echo " non-existant file"
else
echo " The file /usr/lib/shorewall/firewall does not exist"
fi
exit 2
fi
PATH=/sbin:/bin:/usr/sbin:/usr/bin:/usr/local/bin:/usr/local/sbin
version_file=/usr/lib/shorewall/version
if [ -f $version_file ]; then
version=`cat $version_file`
else
echo "ERROR: Shorewall is not properly installed"
echo " The file /usr/lib/shorewall/version does not exist"
exit 1
fi
banner="Shorewall-$version Status at $HOSTNAME -"
get_statedir
case "$1" in
start|stop|restart|reset|clear|refresh|check)
[ $# -ne 1 ] && usage 1
exec $firewall $debugging $nolock $1
;;
add|delete)
[ $# -ne 3 ] && usage 1
exec $firewall $debugging $nolock $1 $2 $3
;;
show)
[ $# -gt 2 ] && usage 1
case "$2" in
connections)
echo -e "Shorewall-$version Connections at $HOSTNAME - `date`\\n"
cat /proc/net/ip_conntrack
;;
nat)
echo -e "Shorewall-$version NAT at $HOSTNAME - `date`\\n"
show_reset
iptables -t nat -L -n -v
;;
tos|mangle)
echo -e "Shorewall-$version TOS at $HOSTNAME - `date`\\n"
show_reset
iptables -t mangle -L -n -v
;;
log)
get_config
echo -e "Shorewall-$version Log at $HOSTNAME - `date`\\n"
show_reset
host=`echo $HOSTNAME | sed 's/\..*$//'`
packet_log 20
;;
tc)
echo -e "Shorewall-$version Traffic Control at $HOSTNAME - `date`\\n"
show_tc
;;
*)
echo -e "Shorewall-$version Chain $2 at $HOSTNAME - `date`\\n"
show_reset
iptables -L $2 -n -v
;;
esac
;;
monitor)
if [ $# -eq 2 ]; then
monitor_firewall $2
elif [ $# -eq 1 ]; then
monitor_firewall 30
else
usage 1
fi
;;
status)
[ $# -eq 1 ] || usage 1
get_config
clear
echo -e "Shorewall-$version Status at $HOSTNAME - `date`\\n"
show_reset
host=`echo $HOSTNAME | sed 's/\..*$//'`
iptables -L -n -v
echo
packet_log 20
echo
iptables -t nat -L -n -v
echo
iptables -t mangle -L -n -v
echo
cat /proc/net/ip_conntrack
;;
hits)
[ $# -eq 1 ] || usage 1
get_config
clear
echo -e "Shorewall-$version Hits at $HOSTNAME - `date`\\n"
timeout=30
if [ `grep -c "Shorewall:" $LOGFILE ` -gt 0 ] ; then
echo " HITS IP DATE"
echo " ---- --------------- ------"
grep "Shorewall:" $LOGFILE | sed 's/\(.\{6\}\)\(.*SRC=\)\(.*\)\( DST=.*\)/\3 \1/' | sort | uniq -c | sort -rn
echo ""
echo " HITS IP PORT"
echo " ---- --------------- -----"
grep "Shorewall:" $LOGFILE | sed 's/\(.*SRC=\)\(.*\)\( DST=.*DPT=\)\([0-9]\{1,5\}\)\(.*\)/\2 \4/
t
s/\(.*SRC=\)\(.*\)\( DST=.*\)/\2/' | sort | uniq -c | sort -rn
echo ""
echo " HITS DATE"
echo " ---- ------"
grep "Shorewall:" $LOGFILE | sed 's/\(.\{6\}\)\(.*\)/\1/' | sort | uniq -c | sort -rn
echo ""
echo " HITS PORT SERVICE(S)"
echo " ---- ----- ----------"
grep 'Shorewall:.*DPT' $LOGFILE | sed 's/\(.*DPT=\)\([0-9]\{1,5\}\)\(.*\)/\2/' | sort | uniq -c | sort -rn | \
while read count port ; do
# List all services defined for the given port
srv=`grep "^[^#].*\\b$port/" /etc/services | cut -f 1 | sort -u`
srv=`echo $srv | sed 's/ /,/g'`
if [ -n "$srv" ] ; then
printf '%7d %5d %s\n' $count $port $srv
else
printf '%7d %5d\n' $count $port
fi
done
fi
;;
version)
echo $version
;;
try)
[ -n "$SHOREWALL_DIR" ] && startup_error "Error: -c option may not be used with \"try\""
[ $# -lt 2 -o $# -gt 3 ] && usage 1
if ! $0 -c $2 restart; then
if ! iptables -L shorewall > /dev/null 2> /dev/null; then
$0 start
fi
elif ! iptables -L shorewall > /dev/null 2> /dev/null; then
$0 start
elif [ $# -eq 3 ]; then
sleep $3
$0 restart
fi
;;
logwatch)
if [ $# -eq 2 ]; then
logwatch $2
elif [ $# -eq 1 ]; then
logwatch 30
else
usage 1
fi
;;
drop)
[ $# -eq 1 ] && usage 1
mutex_on
while [ $# -gt 1 ]; do
shift
iptables -A dynamic -s $1 -j DROP || break 1
echo "$1 Dropped"
done
mutex_off
;;
reject)
[ $# -eq 1 ] && usage 1
mutex_on
while [ $# -gt 1 ]; do
shift
iptables -A dynamic -s $1 -j reject || break 1
echo "$1 Rejected"
done
mutex_off
;;
allow)
[ $# -eq 1 ] && usage 1
mutex_on
while [ $# -gt 1 ]; do
shift
if qt iptables -D dynamic -s $1 -j reject; then
#
# Address was rejected -- silently remove any drop as well
#
qt iptables -D dynamic -s $1 -j DROP
echo "$1 Allowed"
elif qt iptables -D dynamic -s $1 -j DROP; then
echo "$1 Allowed"
else
echo "$1 Not Dropped or Rejected"
fi
done
mutex_off
;;
save)
[ $# -ne 1 ] && usage 1
mutex_on
if qt iptables -L shorewall -n; then
[ -d /var/lib/shorewall ] || mkdir /var/lib/shorewall
if iptables -L dynamic -n > /var/lib/shorewall/save; then
echo "Dynamic Rules Saved"
else
echo "Error Saving the Dynamic Rules"
fi
else
echo "Shorewall isn't started"
fi
mutex_off
;;
*)
usage 1
;;
esac
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