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authorChristian Pointner <equinox@spreadspace.org>2013-09-15 01:43:41 (GMT)
committerChristian Pointner <equinox@spreadspace.org>2013-09-15 01:43:41 (GMT)
commitabc736dd0ee0d4ca0006e350f4be91cf6c7732a8 (patch)
tree5e2b606ef0705e4d181a67c7496ea2a147527d8a
initial release
-rw-r--r--AUTHORS1
-rw-r--r--ChangeLog3
-rw-r--r--LICENSE364
-rwxr-xr-xinitscript42
-rwxr-xr-xrules.sh268
-rwxr-xr-xsaswall144
6 files changed, 822 insertions, 0 deletions
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..6762c7c
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1 @@
+Christian Pointner <equinox@spreadspace.org>
diff --git a/ChangeLog b/ChangeLog
new file mode 100644
index 0000000..cb4d928
--- /dev/null
+++ b/ChangeLog
@@ -0,0 +1,3 @@
+2012.??.?? -- Version 0.1
+
+* initial release
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..176ba56
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,364 @@
+#
+# saswall
+#
+# saswall is a simple and safe firewall loader. After reloading a
+# new ruleset it ask for a confirmation and reverts all changes if
+# this confirmation times out.
+#
+# Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+#
+# This file is part of saswall.
+#
+# saswall is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# any later version.
+#
+# saswall 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 saswall. If not, see <http://www.gnu.org/licenses/>.
+#
+
+ GNU GENERAL PUBLIC LICENSE
+ Version 2, June 1991
+
+ Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+ Preamble
+
+ The licenses for most software are designed to take away your
+freedom to share and change it. By contrast, the GNU General Public
+License is intended to guarantee your freedom to share and change free
+software--to make sure the software is free for all its users. This
+General Public License applies to most of the Free Software
+Foundation's software and to any other program whose authors commit to
+using it. (Some other Free Software Foundation software is covered by
+the GNU Lesser General Public License instead.) You can apply it to
+your programs, too.
+
+ When we speak of free software, we are referring to freedom, not
+price. Our General Public Licenses are designed to make sure that you
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+this service if you wish), that you receive source code or can get it
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+
+ GNU GENERAL PUBLIC LICENSE
+ TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
+ 0. This License applies to any program or other work which contains
+a notice placed by the copyright holder saying it may be distributed
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+ 8. If the distribution and/or use of the Program is restricted in
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+ 9. The Free Software Foundation may publish revised and/or new versions
+of the General Public License from time to time. Such new versions will
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+address new problems or concerns.
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+Software Foundation. If the Program does not specify a version number of
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+Foundation.
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+ 10. If you wish to incorporate parts of the Program into other free
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+
+ NO WARRANTY
+
+ 11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
+FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN
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+ 12. IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR
+REDISTRIBUTE THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
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+YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER
+PROGRAMS), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE
+POSSIBILITY OF SUCH DAMAGES.
+
+ END OF TERMS AND CONDITIONS
+
+ How to Apply These Terms to Your New Programs
+
+ If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+ To do so, attach the following notices to the program. It is safest
+to attach them to the start of each source file to most effectively
+convey the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+ <one line to give the program's name and a brief idea of what it does.>
+ Copyright (C) <year> <name of author>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+Also add information on how to contact you by electronic and paper mail.
+
+If the program is interactive, make it output a short notice like this
+when it starts in an interactive mode:
+
+ Gnomovision version 69, Copyright (C) year name of author
+ Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+ This is free software, and you are welcome to redistribute it
+ under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License. Of course, the commands you use may
+be called something other than `show w' and `show c'; they could even be
+mouse-clicks or menu items--whatever suits your program.
+
+You should also get your employer (if you work as a programmer) or your
+school, if any, to sign a "copyright disclaimer" for the program, if
+necessary. Here is a sample; alter the names:
+
+ Yoyodyne, Inc., hereby disclaims all copyright interest in the program
+ `Gnomovision' (which makes passes at compilers) written by James Hacker.
+
+ <signature of Ty Coon>, 1 April 1989
+ Ty Coon, President of Vice
+
+This General Public License does not permit incorporating your program into
+proprietary programs. If your program is a subroutine library, you may
+consider it more useful to permit linking proprietary applications with the
+library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.
diff --git a/initscript b/initscript
new file mode 100755
index 0000000..296e48d
--- /dev/null
+++ b/initscript
@@ -0,0 +1,42 @@
+#!/bin/sh -e
+### BEGIN INIT INFO
+# Provides: firewall
+# Required-Start: $remote_fs $network
+# Required-Stop: $remote_fs $network
+# Default-Start: 2 3 4 5
+# Default-Stop: 0 1 6
+# Short-Description: Configure Firewall.
+### END INIT INFO
+
+# saswall init script which uses the simple and safe firewall loader
+# please don't add any firewall rules here
+# edit /etc/saswall/rules.sh instead
+
+PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin"
+FIREWALL_SCRIPT="/usr/local/sbin/saswall"
+
+. /lib/lsb/init-functions
+
+case "$1" in
+start)
+ log_action_begin_msg "Loading Firewall rules"
+ $FIREWALL_SCRIPT up
+ log_action_end_msg $?
+ ;;
+stop)
+ log_action_begin_msg "Clearing Firewall rules"
+ echo -n " "
+ $FIREWALL_SCRIPT down
+ log_action_end_msg $?
+ ;;
+force-reload|restart)
+ echo "Reloading Firewall"
+ $FIREWALL_SCRIPT reload
+ ;;
+*)
+ echo "Usage: /etc/init.d/firewall {start|stop|force-reload|restart}"
+ exit 1
+ ;;
+esac
+
+exit 0
diff --git a/rules.sh b/rules.sh
new file mode 100755
index 0000000..d2f0405
--- /dev/null
+++ b/rules.sh
@@ -0,0 +1,268 @@
+#!/bin/sh -e
+#
+# saswall
+#
+# saswall is a simple and safe firewall loader. After reloading a
+# new ruleset it ask for a confirmation and reverts all changes if
+# this confirmation times out.
+#
+# Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+#
+# This file is part of saswall.
+#
+# saswall is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# any later version.
+#
+# saswall 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 saswall. If not, see <http://www.gnu.org/licenses/>.
+#
+## Sample rules.sh for saswall
+##
+## this file gets sourced by /usr/local/sbin/saswall
+## - please add your rules here
+## - redfined the variable SASWALL_CONFIRM_TIMEOUT if you want
+## a different timout (default: 20 -> 20s)
+## - don't use variable and function names starting with
+## saswall or SASWALL
+## - functions ipv4_up, ipv4_down, ipv6_up and ipv6_down must
+## be defined here as they get called by the saswall script
+## - don't use exit!!
+##
+
+#######################
+# Definitions #
+#######################
+
+IPTABLES="/sbin/iptables"
+IP6TABLES="/sbin/ip6tables"
+
+[ -x $IPTABLES ] || exit 0
+[ -x $IP6TABLES ] || exit 0
+
+FILTER="$IPTABLES -t filter"
+NAT="$IPTABLES -t nat"
+MANGLE="$IPTABLES -t mangle"
+
+FILTER6="$IP6TABLES -t filter"
+MANGLE6="$IP6TABLES -t mangle"
+
+
+
+EXT_IF=eth0
+EXT_IP=1.2.3.4
+
+INT_IF=eth1
+LOCAL_IP=192.168.1.1
+LOCAL_NET=192.168.1.0/24
+
+PORTFW=""
+PORTFW="$PORTFW udp,1234,192.168.1.1:1234"
+PORTFW="$PORTFW tcp,80,192.168.1.2:8080"
+
+PORTFW6="" # well not really port forwardings but allowed traffic
+PORTFW6="$PORTFW tcp,80,1234::1.8080"
+
+TCP_IN_PORTS="22000"
+UDP_IN_PORTS=""
+
+
+#########################
+# IPv4 UP #
+#########################
+
+ipv4_up() {
+# FORWARD
+ # local traffic
+
+ # nothing here
+
+ # outbound traffic
+
+ # main NAT
+ $NAT -A POSTROUTING -s $LOCAL_NET -o $EXT_IF -j SNAT --to $EXT_IP
+
+ # allow forwarded outbound traffic
+ $FILTER -A FORWARD -i lo -j ACCEPT
+ $FILTER -A FORWARD -i $INT_IF -j ACCEPT
+
+ # inbound traffic
+
+ # allow icmp and active connections
+ $FILTER -A FORWARD -i $EXT_IF -o $INT_IF -p icmp -j ACCEPT
+ $FILTER -A FORWARD -i $EXT_IF -o $INT_IF -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ # install port forwardings and allow traffic through it
+ for fw in $PORTFW; do
+ proto=${fw%%,*}
+ port=${fw#*,}
+ port=${port%%,*}
+ to=${fw##*,}
+ to_ip=${to%%:*}
+ if [ "$to_ip" = "$to" ]; then
+ to_port=$port
+ else
+ to_port=${to##*:}
+ fi
+ $NAT -A PREROUTING -i $EXT_IF -d $EXT_IP -p $proto --dport $port -j DNAT --to $to
+ $FILTER -A FORWARD -i $EXT_IF -o $INT_IF -d $to_ip -p $proto --dport $to_port -j ACCEPT
+ done
+
+ # Policy -> DROP
+
+ $FILTER -P FORWARD DROP
+
+
+
+# INPUT
+
+ # allow everything from internal interfaces
+ $FILTER -A INPUT -i lo -j ACCEPT
+ $FILTER -A INPUT -i $INT_IF -j ACCEPT
+
+
+ # allow icmp and active connections from external
+ $FILTER -A INPUT -i $EXT_IF -p icmp -j ACCEPT
+ $FILTER -A INPUT -i $EXT_IF -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ # allow
+ for port in $TCP_IN_PORTS; do
+ $FILTER -A INPUT -i $EXT_IF -p tcp --dport $port -j ACCEPT
+ done
+ for port in $UDP_IN_PORTS; do
+ $FILTER -A INPUT -i $EXT_IF -p udp --dport $port -j ACCEPT
+ done
+
+
+ # Policy -> DROP
+
+ $FILTER -P INPUT DROP
+
+
+
+# OUTPUT
+
+ # nothing here
+
+
+
+# END
+ echo -n "success"
+}
+
+
+#########################
+# IPv6 UP #
+#########################
+
+ipv6_up() {
+# FORWARD
+ # local traffic
+
+ # nothing here
+
+ # outbound traffic
+
+ # allow forwarded outbound traffic
+ $FILTER6 -A FORWARD -i lo -j ACCEPT
+ $FILTER6 -A FORWARD -i $INT_IF -j ACCEPT
+
+ # inbound traffic
+
+ # allow icmp and active connections
+ $FILTER6 -A FORWARD -i $EXT_IF -o $INT_IF -p icmp -j ACCEPT
+ $FILTER6 -A FORWARD -i $EXT_IF -o $INT_IF -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ # allow traffic to internal hosts
+ for fw in $PORTFW6; do
+ proto=${fw%%,*}
+ port=${fw#*,}
+ port=${port%%,*}
+ to=${fw##*,}
+ to_ip=${to%%:*}
+ if [ "$to_ip" = "$to" ]; then
+ to_port=$port
+ else
+ to_port=${to##*:}
+ fi
+ $FILTER6 -A FORWARD -i $EXT_IF -o $INT_IF -d $to_ip -p $proto --dport $to_port -j ACCEPT
+ done
+
+ # Policy -> DROP
+
+ $FILTER6 -P FORWARD DROP
+
+
+
+# INPUT
+
+ # allow everything form internal interface
+ $FILTER6 -A INPUT -i lo -j ACCEPT
+ $FILTER6 -A INPUT -i $INT_IF -j ACCEPT
+
+
+ # allow icmp and active connections
+ $FILTER6 -A INPUT -i $EXT_IF -p icmpv6 -j ACCEPT
+ $FILTER6 -A INPUT -i $EXT_IF -m state --state RELATED,ESTABLISHED -j ACCEPT
+
+ # allow
+ for port in $TCP_IN_PORTS; do
+ $FILTER6 -A INPUT -i $EXT_IF -p tcp --dport $port -j ACCEPT
+ done
+ for port in $UDP_IN_PORTS; do
+ $FILTER6 -A INPUT -i $EXT_IF -p udp --dport $port -j ACCEPT
+ done
+
+
+ # Policy -> DROP
+
+ $FILTER6 -P INPUT DROP
+
+
+
+# OUTPUT
+
+ # nothing here
+
+
+
+# END
+ echo -n "success"
+}
+
+
+#########################
+# IPv4 DOWN #
+#########################
+
+ipv4_down() {
+ $MANGLE -F
+ $NAT -F
+ $FILTER -F
+ $FILTER -P INPUT ACCEPT
+ $FILTER -P FORWARD ACCEPT
+ $FILTER -P OUTPUT ACCEPT
+
+ echo -n "success"
+}
+
+
+#########################
+# IPv6 DOWN #
+#########################
+
+ipv6_down() {
+ $MANGLE6 -F
+ $FILTER6 -F
+ $FILTER6 -P INPUT ACCEPT
+ $FILTER6 -P FORWARD ACCEPT
+ $FILTER6 -P OUTPUT ACCEPT
+
+ echo -n "success"
+}
diff --git a/saswall b/saswall
new file mode 100755
index 0000000..5f182ab
--- /dev/null
+++ b/saswall
@@ -0,0 +1,144 @@
+#!/bin/bash -e
+#
+# saswall
+#
+# saswall is a simple and safe firewall loader. After reloading a
+# new ruleset it ask for a confirmation and reverts all changes if
+# this confirmation times out.
+#
+# Copyright (C) 2013 Christian Pointner <equinox@spreadspace.org>
+#
+# This file is part of saswall.
+#
+# saswall is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 2 of the License, or
+# any later version.
+#
+# saswall is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with saswall. If not, see <http://www.gnu.org/licenses/>.
+#
+##
+## !! Don't add any firewall rules here !!
+## edit /etc/saswall/rules.sh instead
+##
+##
+
+trap saswall_signal INT TERM
+trap saswall_exit EXIT
+
+SASWALL_CONFIRM_TIMEOUT=20 # may get overwritten by rules.sh!!
+
+. /etc/saswall/rules.sh
+
+saswall_signal()
+{
+ echo ""
+ echo "saswall terminates after signal"
+ saswall_restore
+ exit 1
+}
+
+saswall_exit()
+{
+ if [ -n "$SASWALL_BACKUP" ] || [ -n "$SASWALL_BACKUP6" ]; then
+ echo ""
+ echo "saswall terminates after error"
+ saswall_restore
+ exit 1
+ fi
+}
+
+saswall_up()
+{
+ echo -n "IPv4("
+ ipv4_up
+ echo -n ") "
+ echo -n "IPv6("
+ ipv6_up
+ echo -n ") "
+}
+
+saswall_down()
+{
+ echo -n "IPv4("
+ ipv4_down
+ echo -n ") "
+ echo -n "IPv6("
+ ipv6_down
+ echo -n ") "
+}
+
+saswall_backup()
+{
+ SASWALL_BACKUP=`/bin/mktemp /tmp/saswall-rules.XXXXXXXXXX`
+ echo "storing current IPv4 ruleset to $SASWALL_BACKUP"
+ /sbin/iptables-save -c > $SASWALL_BACKUP
+
+ SASWALL_BACKUP6=`/bin/mktemp /tmp/saswall-rules.XXXXXXXXXX`
+ echo "storing current IPv6 ruleset to $SASWALL_BACKUP6"
+ /sbin/ip6tables-save -c > $SASWALL_BACKUP6
+}
+
+saswall_restore()
+{
+ if [ -n "$SASWALL_BACKUP" ]; then
+ echo "restoring IPv4 ruleset from $SASWALL_BACKUP"
+ /sbin/iptables-restore -c < $SASWALL_BACKUP
+ rm -f $SASWALL_BACKUP
+ SASWALL_BACKUP=""
+ fi
+ if [ -n "$SASWALL_BACKUP6" ]; then
+ echo "restoring IPv6 ruleset from $SASWALL_BACKUP6"
+ /sbin/ip6tables-restore -c < $SASWALL_BACKUP6
+ rm -f $SASWALL_BACKUP6
+ SASWALL_BACKUP6=""
+ fi
+}
+
+saswall_check_or_fallback()
+{
+ set +e
+ read -t $SASWALL_CONFIRM_TIMEOUT -p "To confirm changes type yes [ENTER]: " saswall_confirmation
+ if [ "$saswall_confirmation" != "yes" ]; then
+ echo "no or wrong confirmation received"
+ saswall_restore
+ exit 1
+ else
+ echo "ruleset reloaded successfully"
+ rm -f $SASWALL_BACKUP
+ SASWALL_BACKUP=""
+ rm -f $SASWALL_BACKUP6
+ SASWALL_BACKUP6=""
+ fi
+}
+
+case "$1" in
+up)
+ saswall_up
+ ;;
+down)
+ saswall_down
+ ;;
+reload)
+ saswall_backup
+ echo -n "down: "
+ saswall_down
+ echo -n " ... up: "
+ saswall_up
+ echo ""
+ saswall_check_or_fallback
+ ;;
+*)
+ echo "Usage: $0 {up|down|reload}"
+ exit 1
+ ;;
+esac
+
+exit 0
+