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2.00 Alpha 1
- Complete code rewrite and restructure to solve some long standing issues with v1
- Separate out functions into support files for easier grouping of what they do
- Make more compatible with debian filesystem layout, including separating out into
/etc/firewall-sosdg for configs only, /usr/sbin for actual scripts, and
/usr/lib/firewall-sosdg for include/functions/etc that don't belong in config
=-=-=-=-= PRE 2.0 REWRITE =-=-=-=-=
1.1 - Brielle Bruns <bruns@2mbit.com>
- Reorder rules, place allow before block to allow overrides
- Fixes for conntrack rules for better security (added -o/-i)
- Correct some incorrect info in options.default
1.0 - Brielle Bruns <bruns@2mbit.com>
- Minor tweaks to various config files
- Fix issue with tweaks loading
- Version 1.0
0.9.14 - Brielle Bruns <bruns@2mbit.com>
- IPv6 DHCP bypass rules (IPV6_LANDHCPSERVER)
- Move FORWARD Established,Related rules to inside NAT rules, since without NAT,
we're not really going to need to track connections forwarding through the system.
I can probably be proven wrong if you don't use NAT but use the script for stateful
firewalling with non-RFC1918 IPs....
- Cleanup work on code for v1.0
0.9.13 - Brielle Bruns <bruns@2mbit.com>
- Fix location of ipv6 fi statement, moved to end of ipv6 rules
- Add default policy rules and IPV{4|6}_P{INPUT|OUTPUT|FORWARD} options
to control them. Note the difference between BLOCKINCOMING and the PINPUT variable
- Oops, looks like my state match of allowing NEW was undoing the incoming blocks. Fixed.
- IPV4_ALLOWED and IPV6_ALLOWED which will eventually replace TCPPORTS and UDPPORTS
0.9.12 - Brielle Bruns <bruns@2mbit.com>
- Change IPV6_ROUTEDCLIENTBLOCK so you can specify ranges to
block incoming to.
- Add support for allowing IPV6 critical ICMP messages, on by default
- Add support for interception of IPv4 packets, aka transparent proxy
- Add beginning support for error checking of variable inputs, still not functional yet.
- Test if we are using at least bash 3.x, since some of the more advanced features
we are using to make this script work don't work too well with bash < 3.0 or dash.
0.9.11 - Brielle Bruns <bruns@2mbit.com>
- Move some of the config clutter to conf/ - you can
put your config files anywhere, but by default, they're
now going to be in conf/
- Beginning work on configuration tool. If it ever
gets completed is a whole different story. :)
- Option to use state or conntrack module for state tracking.
By default, use conntrack.
- After some research, we seem to not need NEW state match in FORWARD
- Auto detect default gateway interface and IP of interface. Has potential problems
if run before we've got a default interface, so manually define EXTIF to be sure, and
things should be okay. This is mostly for people with dynamic IPs.
0.9.10 - Brielle Bruns <bruns@2mbit.com>
- Move clamp mss up earlier in the rules to possibly
fix an issue I noticed during testing
- Move icmp allow code
- Prevent duplicate icmp allow rules in NAT code
- NETMAP support in NAT code
0.9.9a - Brielle Bruns <bruns@2mbit.com>
- Minor bug fixes for my coding errors introduced in
the change of IPv6 variables
0.9.9 - Brielle Bruns <bruns@2mbit.com>
- Loadable module support during firewall loading
- More init script fixes.
- Non-conntracked DNS reply packets allow options
- Slightly improved IPv6 support to start to bring
it up to par with IPv4 support.
- ipv6 marking support, changed ipv4 to use | instead of :
- Renamed IPV6 variables, please read INSTALL file about conversion of config file
to new format.
0.9.8a - Brielle Bruns <bruns@2mbit.com>
- Fixing executable file permission issues
- Use /bin/bash in initscript cause dash does not recognize
more advanced methods that bash can use. Oops. Easiest
way to keep up to date is to symlink /etc/init.d/firewall-sosdg
to /etc/firewall-sosdg/doc/firewall-sosdg.init
0.9.8 - Brielle Bruns <bruns@2mbit.com>
- Almost at v1.0 quality for my tastes
- BLOCK_(INCOMING/OUTGOING)_RFC1918 options to help sure up security of LAN space leakage
- Changes to LANDHCPSERVER so it accepts interface names, plus a possible fix for win7
hammering DHCP server for unknown reason?
- Cleanups
- No longer display list of blocked IPs, considering if they are
as long as my list is, they'll take 4 pages to display...
- New block file format, much more capable now, thanks to
an hour or two of improving my bash scripting skills to the
point where I can do more complex breakdowns of formats
- Rename blocked to ipv4-blocked since we're going to have
ipv6 support
- ipv6 blocking support. Different format for config file
because IPv6 uses :, which means we get to use | for both
ipv4 and ipv6 (goes against a previous commit)
0.9.7 - Brielle Bruns <bruns@2mbit.com>
- Support for marking packets, uses new config file and
IPv4_MARK file option
- MULTI-NIC-ARP-LOCK hack added, to fix what I consider to be an annoying 'feature' of
arp requests on Linux
- Allow use of multiport iptables module to reduce amount of rules
0.9.6 - Brielle Bruns <bruns@2mbit.com>
- Minor changes to procedures in planning of 1.0
0.9.5 - Brielle Bruns <bruns@2mbit.com>
- Makefile to automate building tarball and for future use
- More changes to port-forwards file to support source IP and external IP (existing
config _will_ be incompatible)
0.9.4 - Brielle Bruns <bruns@2mbit.com>
- Initscript
- stop-firewall for... stopping the firewall!
- Code cleanups
- Use of functions for some processes
- Fix DHCP rule
- Obsoleted NATRANGE, NATEXTIP, NATEXTIF
- Added NAT_RANGE which can take SNAT/MASQ rules
- Changed port forwarding rules to include external interface
0.9.3 - Brielle Bruns <bruns@2mbit.com>
- Misc tweaks and reorg
- Custom command files
0.9 - Brielle Bruns <bruns@2mbit.com>
- Colorize output
- Added outbound port blocking options
0.8 - Brielle Bruns <bruns@2mbit.com>
- IPv6 Connection Tracking fixes
- Strip ECN off of specific outbound packets
0.7 - Brielle Bruns <bruns@2mbit.com>
- MSS Clamp on IPv6
- MSS Fixes, yes, its ugly
- Beginning support for bogons filtering and updater
script. Does not work yet, so don't use.
0.6 - Brielle Bruns <bruns@2mbit.com>
- Fixed some potential ordering issues with NAT
- Added file for blocked IPs, plus new config option
0.5 - Brielle Bruns <bruns@2mbit.com>
- Fixing ipv6 UDP firewalling rules
- Fixing IPv6 client routing block rules
- Added new IPV6LAN interface option
0.4 - Brielle Bruns <bruns@2mbit.com>
- Added support for pre-run commands
- Fixed several bugs with NAT commands

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A patent license is "discriminatory" if it does not include within
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contain the covered work, unless you entered into that arrangement,
or that patent license was granted, prior to 28 March 2007.
Nothing in this License shall be construed as excluding or limiting
any implied license or other defenses to infringement that may
otherwise be available to you under applicable patent law.
12. No Surrender of Others' Freedom.
If conditions are imposed on you (whether by court order, agreement or
otherwise) that contradict the conditions of this License, they do not
excuse you from the conditions of this License. If you cannot convey a
covered work so as to satisfy simultaneously your obligations under this
License and any other pertinent obligations, then as a consequence you may
not convey it at all. For example, if you agree to terms that obligate you
to collect a royalty for further conveying from those to whom you convey
the Program, the only way you could satisfy both those terms and this
License would be to refrain entirely from conveying the Program.
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have
permission to link or combine any covered work with a work licensed
under version 3 of the GNU Affero General Public License into a single
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License will continue to apply to the part which is the covered work,
but the special requirements of the GNU Affero General Public License,
section 13, concerning interaction through a network will apply to the
combination as such.
14. Revised Versions of this License.
The Free Software Foundation may publish revised and/or new versions of
the GNU General Public License from time to time. Such new versions will
be similar in spirit to the present version, but may differ in detail to
address new problems or concerns.
Each version is given a distinguishing version number. If the
Program specifies that a certain numbered version of the GNU General
Public License "or any later version" applies to it, you have the
option of following the terms and conditions either of that numbered
version or of any later version published by the Free Software
Foundation. If the Program does not specify a version number of the
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by the Free Software Foundation.
If the Program specifies that a proxy can decide which future
versions of the GNU General Public License can be used, that proxy's
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to choose that version for the Program.
Later license versions may give you additional or different
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later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
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17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
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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
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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
state 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 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
the 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>.

0
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#/bin/bash
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2014 Brielle Bruns
# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
#
# 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/>.
# Static config options, normally do not need to change
FW_VERSION="2.0"
# Important directory locations
FWPREFIX="/usr/local"
FWCONFIGDIR="${FWPREFIX}/etc/firewall-sosdg"
FWLIBDIR="${FWPREFIX}/lib/firewall-sosdg"
FWBINDIR="${FWPREFIX}/bin"
# Begin sourcing critical files, because we need things like path right away
source "${FWCONFIGDIR}/main.conf"
source "${FWLIBDIR}/binaries.inc"
source "${FWLIBDIR}/iptables.inc"
source "${FWLIBDIR}/display.inc"
# We require at least bash v3 or later at this point given some of the more complex
# operations we do to make the firewall script work.
if (( ${BASH_VERSINFO[0]} <= "2" )); then
echo "Error: We can only run with bash 3.0 or higher. Please upgrade your version"
echo "of bash to something more recent, preferably the latest which is, as of this"
echo "writing, 4.x"
exit 1
fi

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# IPv4 Specific Configuration File

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# IPv4 Specific Configuration File

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# Main Configuration File
# Define a prefix for important locations of binaries
PREFIX="/bin:/sbin:/usr/bin:/usr/sbin:${PREFIX}"
# Enable / Disable IPv4 and IPv6 support (yes/no)
EnableIPv4=yes
EnableIPv6=yes

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#!/bin/bash
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2014 Brielle Bruns
# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
#
# 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/>.
# Try and set some sane defaults for common binaries we need. Can always override them later.
MODPROBE=`which modprobe`
IPTABLES=`which iptables`
IP6TABLES=`which ip6tables`

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#!/bin/bash
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2014 Brielle Bruns
# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
#
# 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/>.
# ANSI color sequences
BLUE="\E[34m"
GREEN="\E[32m"
RED="\E[31m"
YELLOW="\E[33m"
PURPLE="\E[35m"
AQUA="\E[36m"
WHITE="\E[1m"
GREY="\E[37m"
DEFAULT_COLOR="\E[39m"
# display_c $COLOR $TEXT BOOL(YN)
# $COLOR being bash colors
# $TEXT being what to output (make sure to put " " around text)
# BOOL being (Y or N) to do newline at end or not
function display_c {
unset COLOR_CODE TEXT NEWLINE
DEFAULT_COLOR="\E[39m"
COLOR_CODE=`pick_color $1`
TEXT="$2"
if [ "$3" == "N" ]; then
NEWLINE="-n"
fi
echo -e ${NEWLINE} "${COLOR_CODE}${TEXT}${DEFAULT_COLOR}"
}
# pick_color $COLOR
# returns appropriate color codes for use in display_c and such
function pick_color {
case $1 in
BLUE) COLOR="\E[34m" ;;
GREEN) COLOR="\E[32m" ;;
RED) COLOR="\E[31m" ;;
YELLOW) COLOR="\E[33m" ;;
PURPLE) COLOR="\E[35m" ;;
AQUA) COLOR="\E[36m" ;;
WHITE) COLOR="\E[1m" ;;
GREY) COLOR="\E[37m" ;;
*) COLOR="\E[37m" ;;
esac
echo "${COLOR}"
}
# reset_color
function reset_color {
unset NEWLINE
DEFAULT_COLOR="\E[39m"
if [ "$1" == "N" ]; then
NEWLINE="-n"
fi
echo ${NEWLINE} -e "${DEFAULT_COLOR}"
}
# show_help
# Show command line options help
function show_help {
echo "Firewall/SOSDG ${FW_VERSION} - Brielle Bruns <bruns@2mbit.com>"
echo -e "\t--help\t\tShows this info"
echo -e "\t--flush\t\tFlushes all rules back to default ACCEPT"
echo -e "\t--generate-cache\tGenerate cached rule file"
}

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#!/bin/bash
# By Brielle Bruns <bruns@2mbit.com>
# URL: http://www.sosdg.org/freestuff/firewall
# License: GPLv3
#
# Copyright (C) 2009 - 2014 Brielle Bruns
# Copyright (C) 2009 - 2014 The Summit Open Source Development Group
#
# 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/>.
# iptables_rules_flush (ipv6|ipv4)
# Clear all rules from iptables - be very careful in how this is called as it
# could easily lock out the user from the network. Best way to be safe, is to
# call iptables_policy_reset first then this function.
function iptables_rules_flush {
IP_VERSION=$1
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES} ; TABLE_NAMES=/proc/net/ip6_tables_names ;;
ipv4|*) VER_IPTABLES=${IPTABLES} ; TABLE_NAMES=/proc/net/ip_tables_names ;;
esac
display_c RED "Flushing ${IP_VERSION} rules..."
${VER_IPTABLES} --flush &>/dev/null
${VER_IPTABLES} -F OUTPUT &>/dev/null
${VER_IPTABLES} -F PREROUTING &>/dev/null
${VER_IPTABLES} -F POSTROUTING &>/dev/null
for i in `cat $TABLE_NAMES`; do
${VER_IPTABLES} -F -t $i &>/dev/null
done
${VER_IPTABLES} -X
}
# iptables_policy_set (ipv6|ipv4) (ACCEPT|DROP)
# Sets all policy rules to either ACCEPT or DROP for ipv4 or ipv6
# If no policy given, assume ACCEPT
function iptables_policy_reset {
IP_VERSION=$1
SET_POLICY=${2=ACCEPT}
case $IP_VERSION in
ipv6) VER_IPTABLES=${IP6TABLES} ;;
ipv4|*) VER_IPTABLES=${IPTABLES} ;;
esac
display_c RED "Setting ${IP_VERSION} policies to ${SET_POLICY}..."
${VER_IPTABLES} --policy INPUT ${SET_POLICY}
${VER_IPTABLES} --policy OUTPUT ${SET_POLICY}
${VER_IPTABLES} --policy FORWARD ${SET_POLICY}
}