Initial commit of bfw. - bfw - simple Bridge FireWall
(DIR) Log
(DIR) Files
(DIR) Refs
(DIR) README
(DIR) LICENSE
---
(DIR) commit 7b05b307ba83fdb5447472c26723311b3f957235
(HTM) Author: Christoph Lohmann <20h@r-36.net>
Date: Mon, 8 Feb 2016 19:04:55 +0100
Initial commit of bfw.
Diffstat:
LICENSE | 676 +++++++++++++++++++++++++++++++
Makefile | 30 ++++++++++++++++++++++++++++++
README | 21 +++++++++++++++++++++
bin/bfw | 143 +++++++++++++++++++++++++++++++
config.mk | 9 +++++++++
etc/bfw.all.allowed.conf | 255 +++++++++++++++++++++++++++++++
etc/bfw.windows10.blocked.conf | 150 +++++++++++++++++++++++++++++++
7 files changed, 1284 insertions(+), 0 deletions(-)
---
(DIR) diff --git a/LICENSE b/LICENSE
@@ -0,0 +1,676 @@
+© 2016 Christoph Lohmann <20h at r-36 dot net>
+
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+ 16. Limitation of Liability.
+
+ IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY 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.
+
+ 17. Interpretation of Sections 15 and 16.
+
+ If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+ 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
+tto attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+tthe "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 3 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, see <http://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+ If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+ <program> Copyright (C) <year> <name of author>
+ This program 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, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+ You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+ The GNU 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
+tthe library. If this is what you want to do, use the GNU Lesser General
+Public License instead of this License. But first, please read
+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
(DIR) diff --git a/Makefile b/Makefile
@@ -0,0 +1,30 @@
+# bfw
+# See LICENSE file for copyright and license details.
+
+include config.mk
+
+all:
+
+dist:
+ @echo creating dist tarball
+ @mkdir -p bfw-${VERSION}
+ @cp -R LICENSE Makefile README config.mk etc bin bfw-${VERSION}
+ @tar -cf bfw-${VERSION}.tar bfw-${VERSION}
+ @gzip bfw-${VERSION}.tar
+ @rm -rf bfw-${VERSION}
+
+install: all
+ @echo installing script to ${DESTDIR}${PREFIX}/bin
+ @mkdir -p ${DESTDIR}${PREFIX}/bin
+ @cp -f bin/bfw ${DESTDIR}${PREFIX}/bin
+ @chmod 755 ${DESTDIR}${PREFIX}/bin/bfw
+# @echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
+# @mkdir -p ${DESTDIR}${MANPREFIX}/man1
+# @sed "s/VERSION/${VERSION}/g" < st.1 > ${DESTDIR}${MANPREFIX}/man1/st.1
+# @chmod 644 ${DESTDIR}${MANPREFIX}/man1/st.1
+
+uninstall:
+ @echo removing script from ${DESTDIR}${PREFIX}/bin
+ @rm -f ${DESTDIR}${PREFIX}/bin/bfw
+
+.PHONY: all dist install uninstall
(DIR) diff --git a/README b/README
@@ -0,0 +1,21 @@
+# Bridge FireWall – bfw
+
+## Installation
+
+ make PREFIX=/usr install
+ # copy over examples from etc to /etc/bfw.allowed.conf and
+ # /etc/bfw.blocked.conf
+
+## Links
+
+ git://git.r-36.net/bfw
+ https://git.r-36.net/bfw
+
+## Bugs
+
+Send to:
+ Christoph Lohmann <20h@r-36.net>
+
+
+Have fun!
+
(DIR) diff --git a/bin/bfw b/bin/bfw
@@ -0,0 +1,143 @@
+#!/bin/sh
+#
+# Bridge Firewall to restrict a malicious device.
+#
+
+PATH=/sbin:/bin
+
+# Interfacd to the malicious device.
+INIF="in0"
+# Interface to the outside network.
+OUTIF="out0"
+
+BRIF="br0"
+LOCALIP="192.168.3.30"
+ALLOWEDHOSTS="/etc/bfw.allowed.conf"
+BLOCKEDHOSTS="/etc/bfw.blocked.conf"
+
+do_start() {
+ iptables -F FORWARD
+ iptables -P FORWARD DROP
+
+ # enable connection tracking
+ iptables -I FORWARD -s 0.0.0.0/0.0.0.0 \
+ -d 0.0.0.0/0.0.0.0 -m state --state INVALID -j DROP
+ iptables -I FORWARD -m state --state RELATED,ESTABLISHED \
+ -j ACCEPT
+
+ # fun
+ # iptables -A FORWARD -p icmp -m limit --limt 4/s -j ACCEPT
+ # iptables -I FORWARD -j DROP -p tcp -s 0.0.0.0/0 \
+ # -m string --string "cmd.exe"
+
+ # allow ICMP
+ iptables -A FORWARD -p icmp -j ACCEPT
+
+ # allow DNS
+ iptables -A FORWARD -p udp --dport 53 -j ACCEPT
+
+ # allow local network
+ iptables -A FORWARD -s 192.168.0.0/255.255.0.0 \
+ -d 192.168.0.0/255.255.0.0 -j ACCEPT
+
+ # blocked hosts
+ [ -e "$BLOCKEDHOSTS" ] && {
+ cat "$BLOCKEDHOSTS" \
+ | while read -r line;
+ do
+ [ -z "$line" ] && continue
+
+ case "$line" in
+ \#*)
+ ;;
+ *)
+ iptables -A FORWARD \
+ -s 192.168.0.0/255.255.0.0 \
+ -d $line \
+ -j LOG \
+ --log-prefix \
+ "FORWARD(${INIF}) rule blocked:"
+ iptables -A FORWARD \
+ -s 192.168.0.0/255.255.0.0 \
+ -d $line \
+ -j DROP
+
+ iptables -A FORWARD \
+ -d 192.168.0.0/255.255.0.0 \
+ -s $line \
+ -j LOG \
+ --log-prefix \
+ "FORWARD(${INIF}) rule blocked:"
+ iptables -A FORWARD \
+ -d 192.168.0.0/255.255.0.0 \
+ -s $line \
+ -j DROP
+ ;;
+ esac
+ done
+ }
+
+ # allowed hosts
+ [ -e "$ALLOWEDHOSTS" ] && {
+ cat "$ALLOWEDHOSTS" \
+ | while read -r line;
+ do
+ [ -z "$line" ] && continue
+
+ case "$line" in
+ \#*)
+ ;;
+ *)
+ iptables -A FORWARD \
+ -s 192.168.0.0/255.255.0.0 \
+ -d $line \
+ -j ACCEPT
+ iptables -A FORWARD \
+ -d 192.168.0.0/255.255.0.0 \
+ -s $line \
+ -j ACCEPT
+ ;;
+ esac
+ done
+ }
+
+ # log all remaining rejects
+ iptables -A FORWARD -j LOG \
+ --log-prefix "FORWARD(${INIF}) blocked:"
+ # reject everything else coming from the malicious device
+ iptables -A FORWARD -j REJECT
+}
+
+do_unload() {
+ iptables -F FORWARD
+ iptables -P FORWARD ACCEPT
+}
+
+usage() {
+ printf "usage: %s [start|stop|reload]\n" "$(basename "$1")" >&2
+ exit 1
+}
+
+if [ $# -lt 1 ];
+tthen
+ usage $0
+fi
+
+cmd="$1"
+case "$cmd" in
+start)
+ do_start
+ ;;
+reload|restart)
+ do_unload
+ do_start
+ ;;
+stop)
+ do_unload
+ ;;
+*)
+ usage $0
+ ;;
+esac
+
+
(DIR) diff --git a/config.mk b/config.mk
@@ -0,0 +1,9 @@
+# bfw version
+VERSION = 0.9
+
+# Customize below to fit your system
+
+# paths
+PREFIX = /usr/local
+MANPREFIX = ${PREFIX}/share/man
+
(DIR) diff --git a/etc/bfw.all.allowed.conf b/etc/bfw.all.allowed.conf
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(DIR) diff --git a/etc/bfw.windows10.blocked.conf b/etc/bfw.windows10.blocked.conf
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