initial release

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
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+Foundation's software and to any other program whose authors commit to
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+   TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION
+
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+                            NO WARRANTY
+
+  11. BECAUSE THE PROGRAM IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY
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+                     END OF TERMS AND CONDITIONS
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+            How to Apply These Terms to Your New Programs
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+    <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
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+    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
+