mirror of
https://gitlab.com/shorewall/code.git
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d1ecdcf4a3
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@8957 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
670 lines
14 KiB
Bash
Executable File
670 lines
14 KiB
Bash
Executable File
#!/bin/sh
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#
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# The Shoreline Firewall (Shorewall) Packet Filtering Firewall - V4.2
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 1999,2000,2001,2002,2003,2004,2005,2006,2007 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# If an error occurs while starting or restarting the firewall, the
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# firewall is automatically stopped.
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#
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# Commands are:
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#
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# firewall stop Stops the firewall
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# firewall reset Resets iptables packet and
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# byte counts
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# firewall clear Remove all Shorewall chains
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# and rules/policies.
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# firewall add <iface>[:<host>] zone Adds a host or subnet to a zone
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# firewall delete <iface>[:<host>] zone Deletes a host or subnet from a zone
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#
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#
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# Fatal error -- stops the firewall after issuing the error message
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#
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fatal_error() # $* = Error Message
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{
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echo " ERROR: $@" >&2
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stop_firewall
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exit 2
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}
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#
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# Fatal error during startup -- generate an error message and abend without
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# altering the state of the firewall
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#
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startup_error() # $* = Error Message
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{
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echo " ERROR: $@" >&2
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[ -n "$TMP_DIR" ] && rm -rf $TMP_DIR
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[ -n "$RESTOREBASE" ] && rm -f $RESTOREBASE
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kill $$
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exit 2
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}
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#
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# Send a message to STDOUT and the System Log
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#
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report () { # $* = message
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progress_message3 "$@"
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logger -p kern.info "$@"
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}
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#
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# Run iptables and if an error occurs, stop the firewall and quit
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#
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run_iptables() {
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if [ -z "$KLUDGEFREE" ]; then
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#
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# Purge the temporary files that we use to prevent duplicate '-m' specifications
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#
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[ -n "$PHYSDEV_MATCH" ] && [ -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev
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[ -n "$IPRANGE_MATCH" ] && [ -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange
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fi
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if ! $IPTABLES $@ ; then
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if [ -z "$STOPPING" ]; then
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error_message "ERROR: Command \"$IPTABLES $@\" Failed"
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stop_firewall
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exit 2
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fi
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fi
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}
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#
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# Version of 'run_iptables' that inserts white space after "!" in the arg list
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#
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run_iptables2() {
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case "$@" in
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*!*)
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run_iptables $(fix_bang $@)
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;;
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*)
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run_iptables $@
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;;
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esac
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}
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#
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# Quietly run iptables
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#
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qt_iptables() {
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if [ -z "$KLUDGEFREE" ]; then
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#
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# Purge the temporary files that we use to prevent duplicate '-m' specifications
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#
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[ -n "$PHYSDEV_MATCH" ] && [ -f $TMP_DIR/physdev ] && rm -f $TMP_DIR/physdev
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[ -n "$IPRANGE_MATCH" ] && [ -f $TMP_DIR/iprange ] && rm -f $TMP_DIR/iprange
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fi
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qt $IPTABLES $@
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}
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#
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# Run ip and if an error occurs, stop the firewall and quit
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#
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run_ip() {
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if ! ip $@ ; then
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if [ -z "$STOPPING" ]; then
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error_message "ERROR: Command \"ip $@\" Failed"
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stop_firewall
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exit 2
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fi
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fi
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}
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#
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# Run tc and if an error occurs, stop the firewall and quit
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#
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run_tc() {
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if ! tc $@ ; then
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if [ -z "$STOPPING" ]; then
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error_message "ERROR: Command \"tc $@\" Failed"
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stop_firewall
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exit 2
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fi
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fi
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}
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#
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# Delete a chain if it exists
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#
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deletechain() # $1 = name of chain
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{
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qt $IPTABLES -L $1 -n && qt $IPTABLES -F $1 && qt $IPTABLES -X $1
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}
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#
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# Find broadcast addresses -- if we are compiling a script and 'detect' is specified for an interface
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# the function returns nothing for that interface
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#
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find_broadcasts() {
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for interface in $ALL_INTERFACES; do
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eval bcast=\$$(chain_base $interface)_broadcast
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if [ "x$bcast" = "xdetect" ]; then
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ip -f inet addr show $interface 2> /dev/null | grep 'inet.*brd' | sed 's/inet.*brd //; s/scope.*//;' | sort -u
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elif [ "x${bcast}" != "x-" ]; then
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echo $(separate_list $bcast)
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fi
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done
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}
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#
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# For each entry in the CRITICALHOSTS global list, add INPUT and OUTPUT rules to
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# enable traffic to/from those hosts.
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#
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enable_critical_hosts()
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{
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for host in $CRITICALHOSTS; do
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interface=${host%:*}
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networks=${host#*:}
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$IPTABLES -A INPUT -i $interface $(source_ip_range $networks) -j ACCEPT
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$IPTABLES -A OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT
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done
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}
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#
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# For each entry in the CRITICALHOSTS global list, delete the INPUT and OUTPUT rules that
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# enable traffic to/from those hosts.
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#
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disable_critical_hosts()
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{
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for host in $CRITICALHOSTS; do
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interface=${host%:*}
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networks=${host#*:}
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$IPTABLES -D INPUT -i $interface $(source_ip_range $networks) -j ACCEPT
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$IPTABLES -D OUTPUT -o $interface $(dest_ip_range $networks) -j ACCEPT
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done
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}
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#
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# Undo changes to routing
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#
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undo_routing() {
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#
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# Restore rt_tables database
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#
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if [ -f ${VARDIR}/rt_tables ]; then
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[ -w /etc/iproute2/rt_table -a -z "$KEEP_RT_TABLES" ] && cp -f ${VARDIR}/rt_tables /etc/iproute2/ && progress_message "/etc/iproute2/rt_tables database restored"
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rm -f ${VARDIR}/rt_tables
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fi
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#
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# Restore the rest of the routing table
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#
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if [ -f ${VARDIR}/undo_routing ]; then
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. ${VARDIR}/undo_routing
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progress_message "Shorewall-generated routing tables and routing rules removed"
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rm -f ${VARDIR}/undo_routing
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fi
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}
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restore_default_route() {
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if [ -f ${VARDIR}/default_route ]; then
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local default_route
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default_route=
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local route
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while read route ; do
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case $route in
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default*)
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if [ -n "$default_route" ]; then
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case "$default_route" in
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*metric*)
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#
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# Don't restore a route with a metric -- we only replace the one with metric == 0
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#
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qt ip route delete default metric 0 && \
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progress_message "Default Route with metric 0 deleted"
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;;
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*)
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qt ip route replace $default_route && \
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progress_message "Default Route (${default_route# }) restored"
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;;
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esac
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break
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fi
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default_route="$default_route $route"
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;;
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*)
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default_route="$default_route $route"
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;;
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esac
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done < ${VARDIR}/default_route
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rm -f ${VARDIR}/default_route
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fi
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}
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#
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# Stop the Firewall
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#
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stop_firewall() {
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#
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# Turn off trace unless we were tracing "stop" or "clear"
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#
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[ -n "$RESTOREBASE" ] && rm -f $RESTOREBASE
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case $COMMAND in
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stop|clear)
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;;
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*)
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set +x
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[ -n "${RESTOREFILE:=restore}" ]
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RESTOREPATH=${VARDIR}/$RESTOREFILE
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if [ -x $RESTOREPATH ]; then
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if [ -x ${RESTOREPATH}-ipsets ]; then
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progress_message2 Restoring Ipsets...
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#
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# We must purge iptables to be sure that there are no
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# references to ipsets
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#
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for table in mangle nat filter; do
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iptables -t $table -F
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iptables -t $table -X
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done
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${RESTOREPATH}-ipsets
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fi
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echo Restoring Shorewall...
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if $RESTOREPATH restore; then
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echo "Shorewall restored from $RESTOREPATH"
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set_state "Started"
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else
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set_state "Unknown"
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fi
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kill $$
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exit 2
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fi
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;;
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esac
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set_state "Stopping"
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STOPPING="Yes"
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TERMINATOR=
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deletechain shorewall
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run_user_exit stop
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if [ -n "$MANGLE_ENABLED" ]; then
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run_iptables -t mangle -F
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run_iptables -t mangle -X
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for chain in PREROUTING INPUT FORWARD POSTROUTING; do
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qt $IPTABLES -t mangle -P $chain ACCEPT
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done
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fi
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if [ -n "$RAW_TABLE" ]; then
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run_iptables -t raw -F
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run_iptables -t raw -X
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for chain in PREROUTING OUTPUT; do
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qt $IPTABLES -t raw -P $chain ACCEPT
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done
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fi
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if [ -n "$NAT_ENABLED" ]; then
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delete_nat
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for chain in PREROUTING POSTROUTING OUTPUT; do
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qt $IPTABLES -t nat -P $chain ACCEPT
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done
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fi
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delete_proxy_arp
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[ -n "$CLEAR_TC" ] && delete_tc1
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undo_routing
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restore_default_route
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[ -n "$DISABLE_IPV6" ] && disable_ipv6
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undo_routing
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restore_default_route
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process_criticalhosts
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if [ -n "$CRITICALHOSTS" ]; then
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if [ -z "$ADMINISABSENTMINDED" ]; then
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for chain in INPUT OUTPUT; do
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setpolicy $chain ACCEPT
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done
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setpolicy FORWARD DROP
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deleteallchains
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enable_critical_hosts
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for chain in INPUT OUTPUT; do
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setpolicy $chain DROP
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done
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else
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for chain in INPUT OUTPUT; do
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setpolicy $chain ACCEPT
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done
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setpolicy FORWARD DROP
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deleteallchains
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enable_critical_hosts
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setpolicy INPUT DROP
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for chain in INPUT FORWARD; do
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setcontinue $chain
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done
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fi
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elif [ -z "$ADMINISABSENTMINDED" ]; then
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for chain in INPUT OUTPUT FORWARD; do
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setpolicy $chain DROP
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done
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deleteallchains
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else
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for chain in INPUT FORWARD; do
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setpolicy $chain DROP
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done
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setpolicy OUTPUT ACCEPT
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deleteallchains
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for chain in INPUT FORWARD; do
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setcontinue $chain
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done
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fi
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process_routestopped -A
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$IPTABLES -A INPUT -i lo -j ACCEPT
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[ -z "$ADMINISABSENTMINDED" ] && \
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$IPTABLES -A OUTPUT -o lo -j ACCEPT
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for interface in $(find_interfaces_by_option dhcp); do
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$IPTABLES -A INPUT -p udp -i $interface --dport 67:68 -j ACCEPT
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[ -z "$ADMINISABSENTMINDED" ] && \
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$IPTABLES -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT
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#
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# This might be a bridge
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#
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$IPTABLES -A FORWARD -p udp -i $interface -o $interface --dport 67:68 -j ACCEPT
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done
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case "$IP_FORWARDING" in
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On|on|ON|Yes|yes|YES)
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echo 1 > /proc/sys/net/ipv4/ip_forward
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progress_message2 "IP Forwarding Enabled"
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;;
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Off|off|OFF|No|no|NO)
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echo 0 > /proc/sys/net/ipv4/ip_forward
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progress_message2 "IP Forwarding Disabled!"
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;;
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esac
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run_user_exit stopped
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set_state "Stopped"
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logger -p kern.info "Shorewall Stopped"
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rm -rf $TMP_DIR
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case $COMMAND in
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stop|clear)
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;;
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*)
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#
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# The firewall is being stopped when we were trying to do something
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# else. Remove the lock file and Kill the shell in case we're in a
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# subshell
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#
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kill $$
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;;
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esac
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}
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#
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# Remove all rules and remove all user-defined chains
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#
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clear_firewall() {
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stop_firewall
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setpolicy INPUT ACCEPT
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setpolicy FORWARD ACCEPT
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setpolicy OUTPUT ACCEPT
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run_iptables -F
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echo 1 > /proc/sys/net/ipv4/ip_forward
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if [ -n "$DISABLE_IPV6" ] && qt mywhich ip6tables; then
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ip6tables -P INPUT ACCEPT 2> /dev/null
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ip6tables -P OUTPUT ACCEPT 2> /dev/null
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ip6tables -P FORWARD ACCEPT 2> /dev/null
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fi
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run_user_exit clear
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set_state "Cleared"
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logger -p kern.info "Shorewall Cleared"
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}
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#
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# Delete existing Proxy ARP
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#
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delete_proxy_arp() {
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if [ -f ${VARDIR}/proxyarp ]; then
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while read address interface external haveroute; do
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qt arp -i $external -d $address pub
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[ -z "${haveroute}${NOROUTES}" ] && qt ip route del $address dev $interface
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f=/proc/sys/net/ipv4/conf/$interface/proxy_arp
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[ -f $f ] && echo 0 > $f
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done < ${VARDIR}/proxyarp
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fi
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rm -f ${VARDIR}/proxyarp
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}
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#
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# Delete existing Static NAT
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#
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delete_nat() {
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run_iptables -t nat -F
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run_iptables -t nat -X
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if [ -f ${VARDIR}/nat ]; then
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while read external interface; do
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qt ip addr del $external dev $interface
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done < ${VARDIR}/nat
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rm -f ${VARDIR}/nat
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fi
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[ -d ${VARDIR} ] && touch ${VARDIR}/nat
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}
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#
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# Check for disabled startup
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#
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check_disabled_startup() {
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if [ -z "$STARTUP_ENABLED" ]; then
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echo " Shorewall Startup is disabled -- to enable startup"
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echo " after you have completed Shorewall configuration,"
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echo " change the setting of STARTUP_ENABLED to Yes in"
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echo " ${CONFDIR}/shorewall.conf"
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[ -n "$TMP_DIR" ] && rm -rf $TMP_DIR
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exit 2
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fi
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}
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#
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# Give Usage Information
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#
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usage() {
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echo "Usage: $0 [debug] {start|stop|reset|restart|clear}"
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exit 1
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}
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#
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# E X E C U T I O N B E G I N S H E R E
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#
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#
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# Start trace if first arg is "debug" or "trace"
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#
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[ $# -gt 1 ] && [ "x$1" = xdebug -o "$x$1" = xtrace ] && { set -x ; shift ; }
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NOLOCK=
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[ $# -gt 1 ] && [ "$1" = "nolock" ] && { NOLOCK=Yes; shift ; }
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SHAREDIR=/usr/share/shorewall
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CONFDIR=/etc/shorewall
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[ -f ${CONFDIR}/vardir ] && . ${CONFDIR}/vardir ]
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[ -n "${VARDIR:=/var/lib/shorewall}" ]
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for library in lib.base lib.config; do
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FUNCTIONS=${SHAREDIR}/${library}
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if [ -f $FUNCTIONS ]; then
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[ $VERBOSE -ge 2 ] && echo "Loading $FUNCTIONS..."
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. $FUNCTIONS
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else
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fatal_error "Installation error: $FUNCTIONS does not exist!"
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fi
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done
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PROGRAM=firewall
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COMMAND="$1"
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case "$COMMAND" in
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stop)
|
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[ $# -ne 1 ] && usage
|
|
do_initialize
|
|
#
|
|
# Don't want to do a 'stop' when startup is disabled
|
|
#
|
|
check_disabled_startup
|
|
progress_message3 "Stopping Shorewall..."
|
|
stop_firewall
|
|
[ -n "$SUBSYSLOCK" ] && rm -f $SUBSYSLOCK
|
|
progress_message3 "done."
|
|
;;
|
|
|
|
reset)
|
|
do_initialize
|
|
if ! shorewall_is_started ; then
|
|
echo "Shorewall Not Started"
|
|
[ -n "$TMP_DIR" ] && rm -rf $TMP_DIR
|
|
exit 2;
|
|
fi
|
|
if [ $# -eq 1 ]; then
|
|
$IPTABLES -Z
|
|
$IPTABLES -t nat -Z
|
|
$IPTABLES -t mangle -Z
|
|
report "Shorewall Counters Reset"
|
|
date > ${VARDIR}/restarted
|
|
else
|
|
shift;
|
|
for chain in $@; do
|
|
if chain_exists $chain; then
|
|
if qt $IPTABLES -Z $chain; then
|
|
progress_message3 "Filter table $chain Counters Reset"
|
|
else
|
|
error_message "ERROR: Reset of chain $chain failed"
|
|
status=2
|
|
break
|
|
fi
|
|
else
|
|
error_message "WARNING: Filter Chain $chain does not exist"
|
|
fi
|
|
done
|
|
fi
|
|
;;
|
|
|
|
clear)
|
|
[ $# -ne 1 ] && usage
|
|
do_initialize
|
|
progress_message3 "Clearing Shorewall..."
|
|
clear_firewall
|
|
[ -n "$SUBSYSLOCK" ] && rm -f $SUBSYSLOCK
|
|
progress_message3 "done."
|
|
;;
|
|
|
|
add)
|
|
[ $# -lt 3 ] && usage
|
|
do_initialize
|
|
lib_load dynamiczones "The add command"
|
|
if ! shorewall_is_started ; then
|
|
echo "Shorewall Not Started"
|
|
[ -n "$TMP_DIR" ] && rm -rf $TMP_DIR
|
|
exit 2;
|
|
fi
|
|
shift
|
|
add_to_zone $@
|
|
;;
|
|
|
|
delete)
|
|
[ $# -lt 3 ] && usage
|
|
lib_load dynamiczones "The delete command"
|
|
do_initialize
|
|
if ! shorewall_is_started ; then
|
|
echo "Shorewall Not Started"
|
|
[ -n "$TMP_DIR" ] && rm -rf $TMP_DIR
|
|
exit 2;
|
|
fi
|
|
shift
|
|
delete_from_zone $@
|
|
;;
|
|
|
|
call)
|
|
#
|
|
# Undocumented way to call functions in ${SHAREDIR}/firewall directly
|
|
#
|
|
shift
|
|
do_initialize
|
|
EMPTY=
|
|
$@
|
|
;;
|
|
|
|
*)
|
|
usage
|
|
;;
|
|
|
|
esac
|