adduser/rmuser.sh

   1 #!/bin/sh
   2 #
   3 # SPDX-License-Identifier: BSD-2-Clause-FreeBSD
   4 #
   5 # Copyright (c) 2002, 2003 Michael Telahun Makonnen. All rights reserved.
   6 #
   7 # Redistribution and use in source and binary forms, with or without
   8 # modification, are permitted provided that the following conditions
   9 # are met:
  10 # 1. Redistributions of source code must retain the above copyright
  11 #    notice, this list of conditions and the following disclaimer.
  12 # 2. Redistributions in binary form must reproduce the above copyright
  13 #    notice, this list of conditions and the following disclaimer in the
  14 #    documentation and/or other materials provided with the distribution.
  15 #
  16 # THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  17 # IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  18 # OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  19 # IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  20 # INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  21 # NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22 # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23 # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24 # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  25 # THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26 #
  27 #       Email: Mike Makonnen <mtm@FreeBSD.Org>
  28 #
  29 # $FreeBSD$
  30 #
  31
  32 ATJOBDIR="/var/at/jobs"
  33 CRONJOBDIR="/var/cron/tabs"
  34 MAILSPOOL="/var/mail"
  35 SIGKILL="-KILL"
  36 TEMPDIRS="/tmp /var/tmp"
  37 THISCMD=`/usr/bin/basename $0`
  38 PWCMD="${PWCMD:-/usr/sbin/pw}"
  39
  40 # err msg
  41 #       Display $msg on stderr.
  42 #
  43 err() {
  44         echo 1>&2 ${THISCMD}: $*
  45 }
  46
  47 # verbose
  48 #       Returns 0 if verbose mode is set, 1 if it is not.
  49 #
  50 verbose() {
  51         [ -n "$vflag" ] && return 0 || return 1
  52 }
  53
  54 # rm_files login
  55 #       Removes files or empty directories belonging to $login from various
  56 #       temporary directories.
  57 #
  58 rm_files() {
  59         # The argument is required
  60         [ -n $1 ] && login=$1 || return
  61
  62         totalcount=0
  63         for _dir in ${TEMPDIRS} ; do
  64                 filecount=0
  65                 if [ ! -d $_dir ]; then
  66                         err "$_dir is not a valid directory."
  67                         continue
  68                 fi
  69                 verbose && echo -n "Removing files owned by ($login) in $_dir:"
  70                 filecount=`find 2>/dev/null "$_dir" -user "$login" -delete -print |
  71                     wc -l | sed 's/ *//'`
  72                 verbose && echo " $filecount removed."
  73                 totalcount=$(($totalcount + $filecount))
  74         done
  75         ! verbose && [ $totalcount -ne 0 ] && echo -n " files($totalcount)"
  76 }
  77
  78 # rm_mail login
  79 #       Removes unix mail and pop daemon files belonging to the user
  80 #       specified in the $login argument.
  81 #
  82 rm_mail() {
  83         # The argument is required
  84         [ -n $1 ] && login=$1 || return
  85
  86         verbose && echo -n "Removing mail spool(s) for ($login):"
  87         if [ -f ${MAILSPOOL}/$login ]; then
  88                 verbose && echo -n " ${MAILSPOOL}/$login" ||
  89                     echo -n " mailspool"
  90                 rm ${MAILSPOOL}/$login
  91         fi
  92         if [ -f ${MAILSPOOL}/.${login}.pop ]; then
  93                 verbose && echo -n " ${MAILSPOOL}/.${login}.pop" ||
  94                     echo -n " pop3"
  95                 rm ${MAILSPOOL}/.${login}.pop
  96         fi
  97         verbose && echo '.'
  98 }
  99
 100 # kill_procs login
 101 #       Send a SIGKILL to all processes owned by $login.
 102 #
 103 kill_procs() {
 104         # The argument is required
 105         [ -n $1 ] && login=$1 || return
 106
 107         verbose && echo -n "Terminating all processes owned by ($login):"
 108         killcount=0
 109         proclist=`ps 2>/dev/null -U $login | grep -v '^\ *PID' | awk '{print $1}'`
 110         for _pid in $proclist ; do
 111                 kill 2>/dev/null ${SIGKILL} $_pid
 112                 killcount=$(($killcount + 1))
 113         done
 114         verbose && echo " ${SIGKILL} signal sent to $killcount processes."
 115         ! verbose && [ $killcount -ne 0 ] && echo -n " processes(${killcount})"
 116 }
 117
 118 # rm_at_jobs login
 119 #       Remove at (1) jobs belonging to $login.
 120 #
 121 rm_at_jobs() {
 122         # The argument is required
 123         [ -n $1 ] && login=$1 || return
 124
 125         atjoblist=`find 2>/dev/null ${ATJOBDIR} -maxdepth 1 -user $login -print`
 126         jobcount=0
 127         verbose && echo -n "Removing at(1) jobs owned by ($login):"
 128         for _atjob in $atjoblist ; do
 129                 rm -f $_atjob
 130                 jobcount=$(($jobcount + 1))
 131         done
 132         verbose && echo " $jobcount removed."
 133         ! verbose && [ $jobcount -ne 0 ] && echo -n " at($jobcount)"
 134 }
 135
 136 # rm_crontab login
 137 #       Removes crontab file belonging to user $login.
 138 #
 139 rm_crontab() {
 140         # The argument is required
 141         [ -n $1 ] && login=$1 || return
 142
 143         verbose && echo -n "Removing crontab for ($login):"
 144         if [ -f ${CRONJOBDIR}/$login ]; then
 145                 verbose && echo -n " ${CRONJOBDIR}/$login" || echo -n " crontab"
 146                 rm -f ${CRONJOBDIR}/$login
 147         fi
 148         verbose && echo '.'
 149 }
 150
 151 # rm_ipc login
 152 #       Remove all IPC mechanisms which are owned by $login.
 153 #
 154 rm_ipc() {
 155         verbose && echo -n "Removing IPC mechanisms"
 156         for i in s m q; do
 157                 ipcs -$i |
 158                 awk -v i=$i -v login=$1 '$1 == i && $5 == login { print $2 }' |
 159                 xargs -n 1 ipcrm -$i
 160         done
 161         verbose && echo '.'
 162 }
 163
 164 # rm_user login
 165 #       Remove user $login from the system. This subroutine makes use
 166 #       of the pw(8) command to remove a user from the system. The pw(8)
 167 #       command will remove the specified user from the user database
 168 #       and group file and remove any crontabs. His home
 169 #       directory will be removed if it is owned by him and contains no
 170 #       files or subdirectories owned by other users. Mail spool files will
 171 #       also be removed.
 172 #
 173 rm_user() {
 174         # The argument is required
 175         [ -n $1 ] && login=$1 || return
 176
 177         verbose && echo -n "Removing user ($login)"
 178         [ -n "$pw_rswitch" ] && {
 179                 verbose && echo -n " (including home directory)"
 180                 ! verbose && echo -n " home"
 181         }
 182         ! verbose && echo -n " passwd"
 183         verbose && echo -n " from the system:"
 184         ${PWCMD} userdel -n $login $pw_rswitch
 185         verbose && echo ' Done.'
 186 }
 187
 188 # prompt_yesno msg
 189 #       Prompts the user with a $msg. The answer is expected to be
 190 #       yes, no, or some variation thereof. This subroutine returns 0
 191 #       if the answer was yes, 1 if it was not.
 192 #
 193 prompt_yesno() {
 194         # The argument is required
 195         [ -n "$1" ] && msg="$1" || return
 196
 197         while : ; do
 198                 echo -n "$msg"
 199                 read _ans
 200                 case $_ans in
 201                 [Nn][Oo]|[Nn])
 202                         return 1
 203                         ;;
 204                 [Yy][Ee][Ss]|[Yy][Ee]|[Yy])
 205                         return 0
 206                         ;;
 207                 *)
 208                         ;;
 209                 esac
 210         done
 211 }
 212
 213 # show_usage
 214 #       (no arguments)
 215 #       Display usage message.
 216 #
 217 show_usage() {
 218         echo "usage: ${THISCMD} [-yv] [-f file] [user ...]"
 219         echo "       if the -y switch is used, either the -f switch or"
 220         echo "       one or more user names must be given"
 221 }
 222
 223 #### END SUBROUTINE DEFENITION ####
 224
 225 ffile=
 226 fflag=
 227 procowner=
 228 pw_rswitch=
 229 userlist=
 230 yflag=
 231 vflag=
 232
 233 procowner=`/usr/bin/id -u`
 234 if [ "$procowner" != "0" ]; then
 235         err 'you must be root (0) to use this utility.'
 236         exit 1
 237 fi
 238
 239 args=`getopt 2>/dev/null yvf: $*`
 240 if [ "$?" != "0" ]; then
 241         show_usage
 242         exit 1
 243 fi
 244 set -- $args
 245 for _switch ; do
 246         case $_switch in
 247         -y)
 248                 yflag=1
 249                 shift
 250                 ;;
 251         -v)
 252                 vflag=1
 253                 shift
 254                 ;;
 255         -f)
 256                 fflag=1
 257                 ffile="$2"
 258                 shift; shift
 259                 ;;
 260         --)
 261                 shift
 262                 break
 263                 ;;
 264         esac
 265 done
 266
 267 # Get user names from a file if the -f switch was used. Otherwise,
 268 # get them from the commandline arguments. If we're getting it
 269 # from a file, the file must be owned by and writable only by root.
 270 #
 271 if [ $fflag ]; then
 272         _insecure=`find $ffile ! -user 0 -or -perm +0022`
 273         if [ -n "$_insecure" ]; then
 274                 err "file ($ffile) must be owned by and writeable only by root."
 275                 exit 1
 276         fi
 277         if [ -r "$ffile" ]; then
 278                 userlist=`cat $ffile | while read _user _junk ; do
 279                         case $_user in
 280                         \#*|'')
 281                                 ;;
 282                         *)
 283                                 echo -n "$userlist $_user"
 284                                 ;;
 285                         esac
 286                 done`
 287         fi
 288 else
 289         while [ $1 ] ; do
 290                 userlist="$userlist $1"
 291                 shift
 292         done
 293 fi
 294
 295 # If the -y or -f switch has been used and the list of users to remove
 296 # is empty it is a fatal error. Otherwise, prompt the user for a list
 297 # of one or more user names.
 298 #
 299 if [ ! "$userlist" ]; then
 300         if [ $fflag ]; then
 301                 err "($ffile) does not exist or does not contain any user names."
 302                 exit 1
 303         elif [ $yflag ]; then
 304                 show_usage
 305                 exit 1
 306         else
 307                 echo -n "Please enter one or more usernames: "
 308                 read userlist
 309         fi
 310 fi
 311
 312 _user=
 313 _uid=
 314 for _user in $userlist ; do
 315         # Make sure the name exists in the passwd database and that it
 316         # does not have a uid of 0
 317         #
 318         userrec=`pw 2>/dev/null usershow -n $_user`
 319         if [ "$?" != "0" ]; then
 320                 err "user ($_user) does not exist in the password database."
 321                 continue
 322         fi
 323         _uid=`echo $userrec | awk -F: '{print $3}'`
 324         if [ "$_uid" = "0" ]; then
 325                 err "user ($_user) has uid 0. You may not remove this user."
 326                 continue
 327         fi
 328
 329         # If the -y switch was not used ask for confirmation to remove the
 330         # user and home directory.
 331         #
 332         if [ -z "$yflag" ]; then
 333                 echo "Matching password entry:"
 334                 echo
 335                 echo $userrec
 336                 echo
 337                 if ! prompt_yesno "Is this the entry you wish to remove? " ; then
 338                         continue
 339                 fi
 340                 _homedir=`echo $userrec | awk -F: '{print $9}'`
 341                 if prompt_yesno "Remove user's home directory ($_homedir)? "; then
 342                         pw_rswitch="-r"
 343                 fi
 344         else
 345                 pw_rswitch="-r"
 346         fi
 347
 348         # Disable any further attempts to log into this account
 349         ${PWCMD} 2>/dev/null lock $_user
 350
 351         # Remove crontab, mail spool, etc. Then obliterate the user from
 352         # the passwd and group database.
 353         #
 354         ! verbose && echo -n "Removing user ($_user):"
 355         rm_crontab $_user
 356         rm_at_jobs $_user
 357         rm_ipc $_user
 358         kill_procs $_user
 359         rm_files $_user
 360         rm_mail $_user
 361         rm_user $_user
 362         ! verbose && echo "."
 363 done