From 6161f8d9784f52caa0f303c9ffafbfd587354daa Mon Sep 17 00:00:00 2001 From: "bbruns@gmail.com" Date: Sat, 1 Mar 2014 16:57:03 +0000 Subject: [PATCH] --- ChangeLog | 155 +++++++++++ License | 674 +++++++++++++++++++++++++++++++++++++++++++++++ ReadMe | 0 bin/srfirewall | 43 +++ etc/ipv4.conf | 1 + etc/ipv6.conf | 1 + etc/main.conf | 9 + lib/binaries.inc | 24 ++ lib/display.inc | 82 ++++++ lib/iptables.inc | 56 ++++ 10 files changed, 1045 insertions(+) create mode 100644 ChangeLog create mode 100644 License create mode 100644 ReadMe create mode 100644 bin/srfirewall create mode 100644 etc/ipv4.conf create mode 100644 etc/ipv6.conf create mode 100644 etc/main.conf create mode 100644 lib/binaries.inc create mode 100644 lib/display.inc create mode 100644 lib/iptables.inc diff --git a/ChangeLog b/ChangeLog new file mode 100644 index 0000000..c32ecfe --- /dev/null +++ b/ChangeLog @@ -0,0 +1,155 @@ +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 + - 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 + - Minor tweaks to various config files + - Fix issue with tweaks loading + - Version 1.0 + +0.9.14 - Brielle Bruns + - 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 + - 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 + - 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 + - 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 + - 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 + - Minor bug fixes for my coding errors introduced in + the change of IPv6 variables + +0.9.9 - Brielle Bruns + - 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 + - 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 + - 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 + - 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 + - Minor changes to procedures in planning of 1.0 + +0.9.5 - Brielle Bruns + - 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 + - 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 + - Misc tweaks and reorg + - Custom command files + +0.9 - Brielle Bruns + - Colorize output + - Added outbound port blocking options + +0.8 - Brielle Bruns + - IPv6 Connection Tracking fixes + - Strip ECN off of specific outbound packets + +0.7 - Brielle Bruns + - 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 + - Fixed some potential ordering issues with NAT + - Added file for blocked IPs, plus new config option + +0.5 - Brielle Bruns + - Fixing ipv6 UDP firewalling rules + - Fixing IPv6 client routing block rules + - Added new IPV6LAN interface option + +0.4 - Brielle Bruns + - Added support for pre-run commands + - Fixed several bugs with NAT commands diff --git a/License b/License new file mode 100644 index 0000000..94a9ed0 --- /dev/null +++ b/License @@ -0,0 +1,674 @@ + GNU GENERAL PUBLIC LICENSE + Version 3, 29 June 2007 + + Copyright (C) 2007 Free Software Foundation, Inc. + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The GNU General Public License is a free, copyleft license for +software and other kinds of works. + + The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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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. 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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 +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. + + + Copyright (C) + + 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 . + +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: + + Copyright (C) + 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 +. + + 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 +. diff --git a/ReadMe b/ReadMe new file mode 100644 index 0000000..e69de29 diff --git a/bin/srfirewall b/bin/srfirewall new file mode 100644 index 0000000..799f2a5 --- /dev/null +++ b/bin/srfirewall @@ -0,0 +1,43 @@ +#/bin/bash +# By Brielle Bruns +# 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 . + +# 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 (( ${BASH_VERSINFO[0]} <= "2" )); then + echo "Error: We can only run with bash 3.0 or higher. Please upgrade your version" + echo "of bash to something more recent, preferably the latest which is, as of this" + echo "writing, 4.x" + exit 1 +fi \ No newline at end of file diff --git a/etc/ipv4.conf b/etc/ipv4.conf new file mode 100644 index 0000000..77bd7be --- /dev/null +++ b/etc/ipv4.conf @@ -0,0 +1 @@ +# IPv4 Specific Configuration File \ No newline at end of file diff --git a/etc/ipv6.conf b/etc/ipv6.conf new file mode 100644 index 0000000..77bd7be --- /dev/null +++ b/etc/ipv6.conf @@ -0,0 +1 @@ +# IPv4 Specific Configuration File \ No newline at end of file diff --git a/etc/main.conf b/etc/main.conf new file mode 100644 index 0000000..7a47fa8 --- /dev/null +++ b/etc/main.conf @@ -0,0 +1,9 @@ +# Main Configuration File + +# Define a prefix for important locations of binaries +PREFIX="/bin:/sbin:/usr/bin:/usr/sbin:${PREFIX}" + +# Enable / Disable IPv4 and IPv6 support (yes/no) +EnableIPv4=yes +EnableIPv6=yes + diff --git a/lib/binaries.inc b/lib/binaries.inc new file mode 100644 index 0000000..230a285 --- /dev/null +++ b/lib/binaries.inc @@ -0,0 +1,24 @@ +#!/bin/bash +# By Brielle Bruns +# 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 . + +# 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` diff --git a/lib/display.inc b/lib/display.inc new file mode 100644 index 0000000..58c1afc --- /dev/null +++ b/lib/display.inc @@ -0,0 +1,82 @@ +#!/bin/bash +# By Brielle Bruns +# 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 . + + +# 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 " + 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" + } \ No newline at end of file diff --git a/lib/iptables.inc b/lib/iptables.inc new file mode 100644 index 0000000..6529a74 --- /dev/null +++ b/lib/iptables.inc @@ -0,0 +1,56 @@ +#!/bin/bash +# By Brielle Bruns +# 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 . + +# 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} +} \ No newline at end of file