adduser/rmuser.sh

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