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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
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361 lines
8.9 KiB
Bash
361 lines
8.9 KiB
Bash
#!/bin/sh
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#
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# Copyright (c) 2002, 2003 Michael Telahun Makonnen. 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 ``AS IS'' AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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# OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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# NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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# Email: Mike Makonnen <mtm@FreeBSD.Org>
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#
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# $FreeBSD$
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#
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ATJOBDIR="/var/at/jobs"
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CRONJOBDIR="/var/cron/tabs"
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MAILSPOOL="/var/mail"
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SIGKILL="-KILL"
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TEMPDIRS="/tmp /var/tmp"
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THISCMD=`/usr/bin/basename $0`
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# err msg
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# Display $msg on stderr.
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#
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err() {
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echo 1>&2 ${THISCMD}: $*
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}
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# verbose
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# Returns 0 if verbose mode is set, 1 if it is not.
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#
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verbose() {
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[ -n "$vflag" ] && return 0 || return 1
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}
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# rm_files login
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# Removes files or empty directories belonging to $login from various
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# temporary directories.
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#
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rm_files() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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totalcount=0
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for _dir in ${TEMPDIRS} ; do
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filecount=0
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if [ ! -d $_dir ]; then
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err "$_dir is not a valid directory."
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continue
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fi
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verbose && echo -n "Removing files owned by ($login) in $_dir:"
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filecount=`find 2>/dev/null "$_dir" -user "$login" -delete -print |
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wc -l | sed 's/ *//'`
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verbose && echo " $filecount removed."
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totalcount=$(($totalcount + $filecount))
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done
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! verbose && [ $totalcount -ne 0 ] && echo -n " files($totalcount)"
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}
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# rm_mail login
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# Removes unix mail and pop daemon files belonging to the user
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# specified in the $login argument.
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#
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rm_mail() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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verbose && echo -n "Removing mail spool(s) for ($login):"
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if [ -f ${MAILSPOOL}/$login ]; then
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verbose && echo -n " ${MAILSPOOL}/$login" ||
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echo -n " mailspool"
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rm ${MAILSPOOL}/$login
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fi
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if [ -f ${MAILSPOOL}/${login}.pop ]; then
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verbose && echo -n " ${MAILSPOOL}/${login}.pop" ||
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echo -n " pop3"
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rm ${MAILSPOOL}/${login}.pop
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fi
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verbose && echo '.'
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}
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# kill_procs login
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# Send a SIGKILL to all processes owned by $login.
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#
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kill_procs() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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verbose && echo -n "Terminating all processes owned by ($login):"
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killcount=0
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proclist=`ps 2>/dev/null -U $login | grep -v '^\ *PID' | awk '{print $1}'`
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for _pid in $proclist ; do
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kill 2>/dev/null ${SIGKILL} $_pid
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killcount=$(($killcount + 1))
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done
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verbose && echo " ${SIGKILL} signal sent to $killcount processes."
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! verbose && [ $killcount -ne 0 ] && echo -n " processes(${killcount})"
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}
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# rm_at_jobs login
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# Remove at (1) jobs belonging to $login.
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#
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rm_at_jobs() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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atjoblist=`find 2>/dev/null ${ATJOBDIR} -maxdepth 1 -user $login -print`
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jobcount=0
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verbose && echo -n "Removing at(1) jobs owned by ($login):"
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for _atjob in $atjoblist ; do
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rm -f $_atjob
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jobcount=$(($jobcount + 1))
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done
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verbose && echo " $jobcount removed."
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! verbose && [ $jobcount -ne 0 ] && echo -n " at($jobcount)"
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}
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# rm_crontab login
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# Removes crontab file belonging to user $login.
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#
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rm_crontab() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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verbose && echo -n "Removing crontab for ($login):"
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if [ -f ${CRONJOBDIR}/$login ]; then
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verbose && echo -n " ${CRONJOBDIR}/$login" || echo -n " crontab"
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rm -f ${CRONJOBDIR}/$login
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fi
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verbose && echo '.'
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}
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# rm_ipc login
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# Remove all IPC mechanisms which are owned by $login.
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#
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rm_ipc() {
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verbose && echo -n "Removing IPC mechanisms"
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for i in s m q; do
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ipcs -$i |
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awk -v i=$i -v login=$1 '$1 == i && $5 == login { print $2 }' |
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xargs -n 1 ipcrm -$i
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done
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verbose && echo '.'
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}
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# rm_user login
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# Remove user $login from the system. This subroutine makes use
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# of the pw(8) command to remove a user from the system. The pw(8)
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# command will remove the specified user from the user database
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# and group file and remove any crontabs. His home
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# directory will be removed if it is owned by him and contains no
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# files or subdirectories owned by other users. Mail spool files will
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# also be removed.
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#
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rm_user() {
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# The argument is required
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[ -n $1 ] && login=$1 || return
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verbose && echo -n "Removing user ($login)"
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[ -n "$pw_rswitch" ] && {
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verbose && echo -n " (including home directory)"
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! verbose && echo -n " home"
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}
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! verbose && echo -n " passwd"
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verbose && echo -n " from the system:"
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pw userdel -n $login $pw_rswitch
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verbose && echo ' Done.'
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}
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# prompt_yesno msg
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# Prompts the user with a $msg. The answer is expected to be
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# yes, no, or some variation thereof. This subroutine returns 0
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# if the answer was yes, 1 if it was not.
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#
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prompt_yesno() {
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# The argument is required
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[ -n "$1" ] && msg="$1" || return
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while : ; do
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echo -n "$msg"
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read _ans
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case $_ans in
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[Nn][Oo]|[Nn])
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return 1
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;;
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[Yy][Ee][Ss]|[Yy][Ee]|[Yy])
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return 0
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;;
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*)
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;;
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esac
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done
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}
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# show_usage
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# (no arguments)
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# Display usage message.
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#
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show_usage() {
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echo "usage: ${THISCMD} [-yv] [-f file] [user ...]"
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echo " if the -y switch is used, either the -f switch or"
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echo " one or more user names must be given"
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}
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#### END SUBROUTINE DEFENITION ####
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ffile=
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fflag=
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procowner=
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pw_rswitch=
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userlist=
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yflag=
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vflag=
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procowner=`/usr/bin/id -u`
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if [ "$procowner" != "0" ]; then
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err 'you must be root (0) to use this utility.'
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exit 1
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fi
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args=`getopt 2>/dev/null yvf: $*`
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if [ "$?" != "0" ]; then
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show_usage
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exit 1
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fi
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set -- $args
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for _switch ; do
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case $_switch in
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-y)
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yflag=1
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shift
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;;
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-v)
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vflag=1
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shift
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;;
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-f)
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fflag=1
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ffile="$2"
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shift; shift
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;;
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--)
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shift
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break
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;;
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esac
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done
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# Get user names from a file if the -f switch was used. Otherwise,
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# get them from the commandline arguments. If we're getting it
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# from a file, the file must be owned by and writable only by root.
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#
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if [ $fflag ]; then
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_insecure=`find $ffile ! -user 0 -or -perm +0022`
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if [ -n "$_insecure" ]; then
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err "file ($ffile) must be owned by and writeable only by root."
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exit 1
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fi
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if [ -r "$ffile" ]; then
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userlist=`cat $ffile | while read _user _junk ; do
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case $_user in
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\#*|'')
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;;
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*)
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echo -n "$userlist $_user"
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;;
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esac
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done`
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fi
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else
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while [ $1 ] ; do
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userlist="$userlist $1"
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shift
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done
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fi
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# If the -y or -f switch has been used and the list of users to remove
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# is empty it is a fatal error. Otherwise, prompt the user for a list
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# of one or more user names.
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#
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if [ ! "$userlist" ]; then
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if [ $fflag ]; then
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err "($ffile) does not exist or does not contain any user names."
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exit 1
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elif [ $yflag ]; then
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show_usage
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exit 1
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else
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echo -n "Please enter one or more usernames: "
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read userlist
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fi
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fi
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_user=
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_uid=
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for _user in $userlist ; do
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# Make sure the name exists in the passwd database and that it
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# does not have a uid of 0
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#
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userrec=`pw 2>/dev/null usershow -n $_user`
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if [ "$?" != "0" ]; then
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err "user ($_user) does not exist in the password database."
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continue
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fi
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_uid=`echo $userrec | awk -F: '{print $3}'`
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if [ "$_uid" = "0" ]; then
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err "user ($_user) has uid 0. You may not remove this user."
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continue
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fi
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# If the -y switch was not used ask for confirmation to remove the
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# user and home directory.
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#
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if [ -z "$yflag" ]; then
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echo "Matching password entry:"
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echo
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echo $userrec
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echo
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if ! prompt_yesno "Is this the entry you wish to remove? " ; then
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continue
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fi
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_homedir=`echo $userrec | awk -F: '{print $9}'`
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if prompt_yesno "Remove user's home directory ($_homedir)? "; then
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pw_rswitch="-r"
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fi
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else
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pw_rswitch="-r"
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fi
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# Disable any further attempts to log into this account
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pw 2>/dev/null lock $_user
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# Remove crontab, mail spool, etc. Then obliterate the user from
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# the passwd and group database.
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#
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! verbose && echo -n "Removing user ($_user):"
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rm_crontab $_user
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rm_at_jobs $_user
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rm_ipc $_user
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kill_procs $_user
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rm_files $_user
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rm_mail $_user
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rm_user $_user
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! verbose && echo "."
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done
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