115 lines
3.8 KiB
Bash
115 lines
3.8 KiB
Bash
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#!/bin/sh
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#
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# Copyright (c) 2000 Alexandre Peixoto
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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# SUCH DAMAGE.
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#
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# $FreeBSD$
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# Change ipfw(8) rules with safety guarantees for remote operation
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#
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# Invoke this script to edit rc.firewall. It will call ${EDITOR}, or
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# vi(1) if the environment variable is not set, for you to edit rc.firewall,
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# asks for confirmation and then run rc.firewall. You can then examine
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# the output of ipfw list and confirm whether you want the new version or
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# not.
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#
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# If no answer is received in 30 seconds, the previous rc.firewall is
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# run, restoring the old rules (this assumes ipfw flush is present in
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# it).
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#
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# If the new rules are confirmed, they'll replace rc.firewall and the
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# previous ones will be copied to rc.firewall.{date}. A mail will also
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# be sent to root with the unified diffs of the rule change.
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#
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# Non-approved rules are kept in rc.firewall.new, and you are offered
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# the option of changing them instead of the present rules when you
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# call this script.
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#
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# It is suggested improving this script by using some version control
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# software.
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get_yes_no() {
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while true
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do
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echo -n "$1 (Y/N) ? "
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read -t 30 a
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if [ $? != 0 ]; then
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a="No";
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return;
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fi
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case $a in
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[Yy]) a="Yes";
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return;;
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[Nn]) a="No";
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return;;
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*);;
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esac
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done
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}
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restore_rules() {
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nohup sh /etc/rc.firewall >/dev/null 2>&1
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exit
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}
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if [ -f /etc/rc.firewall.new ]; then
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get_yes_no "A new rules file already exists, do you want to use it"
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[ $a = 'No' ] && cp /etc/rc.firewall /etc/rc.firewall.new
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else
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cp /etc/rc.firewall /etc/rc.firewall.new
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fi
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trap restore_rules SIGHUP
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vi /etc/rc.firewall.new
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get_yes_no "Do you want to install the new rules"
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[ $a = 'No' ] && exit
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cat <<!
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The rules will be changed now. If the message 'Type y to keep the new rules'
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do not appear on the screen or the y key is not pressed in 30 seconds, the
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former rules will be restored.
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The TCP/IP connections might be broken during the change. If so, restore
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the ssh/telnet connection being used.
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!
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nohup sh /etc/rc.firewall.new > /tmp/rc.firewall.out 2>&1;
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sleep 2;
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get_yes_no "Would you like to see the resulting new rules"
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[ $a = 'Yes' ] && vi /tmp/rc.firewall.out
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get_yes_no "Type y to keep the new rules"
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[ $a != 'Yes' ] && restore_rules
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DATE=`date "+%Y%m%d%H%M"`
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cp /etc/rc.firewall /etc/rc.firewall.$DATE
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mv /etc/rc.firewall.new /etc/rc.firewall
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cat <<!
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The new rules are now default. The previous rules have been preserved
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in the file /etc/rc.firewall.$DATE
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!
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diff -F "^# .*[A-Za-z]" -u /etc/rc.firewall.$DATE /etc/rc.firewall | mail -s "`hostname` Firewall rule change" root
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