154 lines
4.5 KiB
Bash
Executable File
154 lines
4.5 KiB
Bash
Executable File
#!/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 ${firewall_script}. It will call ${EDITOR},
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# or vi(1) if the environment variable is not set, for you to edit
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# ${firewall_script}, ask for confirmation, and then run
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# ${firewall_script}. You can then examine the output of ipfw list and
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# confirm whether you want the new version or not.
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#
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# If no answer is received in 30 seconds, the previous
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# ${firewall_script} is run, restoring the old rules (this assumes ipfw
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# flush is present in it).
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#
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# If the new rules are confirmed, they'll replace ${firewall_script} and
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# the previous ones will be copied to ${firewall_script}.{date}. Mail
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# will also be sent to root with a unified diff of the rule change.
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#
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# Unapproved rules are kept in ${firewall_script}.new, and you are
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# offered the option of changing them instead of the present rules when
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# you call this script.
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#
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# This script could be improved by using version control
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# software.
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if [ -r /etc/defaults/rc.conf ]; then
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. /etc/defaults/rc.conf
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source_rc_confs
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elif [ -r /etc/rc.conf ]; then
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. /etc/rc.conf
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fi
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EDITOR=${EDITOR:-/usr/bin/vi}
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PAGER=${PAGER:-/usr/bin/more}
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tempfoo=`basename $0`
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TMPFILE=`mktemp -t ${tempfoo}` || exit 1
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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 ${firewall_script} >/dev/null 2>&1
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rm ${TMPFILE}
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exit 1
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}
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case "${firewall_type}" in
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[Cc][Ll][Ii][Ee][Nn][Tt]|\
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[Cc][Ll][Oo][Ss][Ee][Dd]|\
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[Oo][Pp][Ee][Nn]|\
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[Ss][Ii][Mm][Pp][Ll][Ee]|\
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[Uu][Nn][Kk][Nn][Oo][Ww][Nn])
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edit_file="${firewall_script}"
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rules_edit=no
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;;
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*)
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if [ -r "${firewall_type}" ]; then
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edit_file="${firewall_type}"
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rules_edit=yes
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fi
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;;
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esac
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if [ -f ${edit_file}.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 ${edit_file} ${edit_file}.new
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else
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cp ${edit_file} ${edit_file}.new
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fi
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trap restore_rules SIGHUP
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${EDITOR} ${edit_file}.new
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get_yes_no "Do you want to install the new rules"
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[ $a = 'No' ] && exit 1
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cat <<!
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The rules will be changed now. If the message 'Type y to keep the new
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rules' does not appear on the screen or the y key is not pressed in 30
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seconds, the original 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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if [ ${rules_edit} = yes ]; then
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nohup sh ${firewall_script} ${firewall_type}.new \
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> ${TMPFILE} 2>&1
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else
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nohup sh ${firewall_script}.new \
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> ${TMPFILE} 2>&1
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fi
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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' ] && ${PAGER} ${TMPFILE}
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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 ${edit_file} ${edit_file}.$DATE
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mv ${edit_file}.new ${edit_file}
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cat <<!
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The new rules are now installed. The previous rules have been preserved in
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the file ${edit_file}.$DATE
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!
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diff -F "^# .*[A-Za-z]" -u ${edit_file}.$DATE ${edit_file} \
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| mail -s "`hostname` Firewall rule change" root
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rm ${TMPFILE}
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exit 0
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