1 files changed, 144 insertions, 0 deletions
diff --git a/saswall b/saswall
new file mode 100755
index 0000000..5f182ab
--- /dev/null
+++ b/saswall
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+#!/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
+