IDcheck.sh

   1 #!/bin/sh
   2 #
   3 #    Copyright (c) International Business Machines  Corp., 2001
   4 #
   5 #    This program is free software;  you can redistribute it and/or modify
   6 #    it under the terms of the GNU General Public License as published by
   7 #    the Free Software Foundation; either version 2 of the License, or
   8 #    (at your option) any later version.
   9 #
  10 #    This program is distributed in the hope that it will be useful,
  11 #    but WITHOUT ANY WARRANTY;  without even the implied warranty of
  12 #    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  13 #    the GNU General Public License for more details.
  14 #
  15 #    You should have received a copy of the GNU General Public License
  16 #    along with this program;  if not, write to the Free Software
  17 #    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  18 #
  19 #   FILE        : IDcheck.sh
  20 #   DESCRIPTION : checks for req'd users/groups and will create them if requested.
  21 #   HISTORY     :
  22 #       11/28/2001 Robbie Williamson (robbiew@austin.ibm.com)
  23 #               written
  24 #       03/05/2002 Jay Huie     (wjh@us.ibm.com)
  25 #               Changed script to only ask regarding creation of IDs if
  26 #                       necessary. Cleaner automation of the script and
  27 #                       most distos now have IDs already added
  28 #   HISTORY     : see the cvs log
  29 #
  30
  31 # debian is good enough
  32
  33 exit 0
  34
  35 # Prompt user if ids/groups should be created
  36 clear
  37 echo "Checking for required user/group ids"
  38 echo ""
  39
  40 # Check ids and create if needed.
  41 NO_NOBODY_ID=1
  42 NO_BIN_ID=1
  43 NO_DAEMON_ID=1
  44 NO_NOBODY_GRP=1
  45 NO_BIN_GRP=1
  46 NO_DAEMON_GRP=1
  47 NO_USERS_GRP=1
  48 NO_SYS_GRP=1
  49 I_AM_ROOT=0
  50
  51 #
  52 # id(1) for entry.
  53 #
  54 ife() {
  55         id "$@" > /dev/null
  56 }
  57
  58 #
  59 # grep(1) for entry.
  60 #
  61 gfe() {
  62         grep -q "$@"
  63 }
  64
  65 prompt_for_create() {
  66         if [ -n "$CREATE_ENTRIES" ] ; then
  67
  68                 if [ $I_AM_ROOT -eq 0 ] ; then
  69                         echo "Not root; can't create user / group entries on local machine".
  70                         CREATE_ENTRIES=0
  71                 fi
  72                 echo "CREATE_ENTRIES variable set to $CREATE_ENTRIES ..."
  73                 echo
  74
  75         else
  76
  77                 if [ $NO_NOBODY_ID -ne 0 -o $NO_BIN_ID -ne 0 -o $NO_DAEMON_ID -ne 0 -o $NO_NOBODY_GRP -ne 0 -o $NO_BIN_GRP -ne 0 -o $NO_DAEMON_GRP -ne 0 -o $NO_USERS_GRP -ne 0 -o $NO_SYS_GRP -ne 0 -a $I_AM_ROOT -ne 0 ] ; then
  78                         echo -n "If any required user ids and/or groups are missing, would you like these created? [y/N]"
  79                         read ans
  80                         case "$ans" in
  81                                 Y*|y*) CREATE_ENTRIES=1 ;;
  82                                 *)     CREATE_ENTRIES=0 ;;
  83                         esac
  84                 else
  85                         CREATE_ENTRIES=0
  86                 fi
  87
  88         fi
  89 }
  90
  91 if [ -z ${EUID} ] ; then
  92         EUID=$(id -u)
  93 fi
  94
  95 if [ -e /etc/passwd -a ! -r /etc/passwd ] ; then
  96         echo "/etc/passwd not readable by uid $EUID"
  97         exit 1
  98 elif [ -e /etc/group -a ! -r /etc/group ] ; then
  99         echo "/etc/group not readable by uid $EUID"
 100         exit 1
 101 fi
 102
 103 ife bin; NO_BIN_ID=$?
 104 ife daemon; NO_DAEMON_ID=$?
 105 ife nobody; NO_NOBODY_ID=$?
 106
 107 gfe '^bin:' /etc/group; NO_BIN_GRP=$?
 108 gfe '^daemon:' /etc/group; NO_DAEMON_GRP=$?
 109 gfe '^nobody:' /etc/group; NO_NOBODY_GRP=$?
 110 gfe '^sys:' /etc/group; NO_SYS_GRP=$?
 111 gfe '^users:' /etc/group; NO_USERS_GRP=$?
 112
 113 if [ $EUID -eq 0 ] ; then
 114         I_AM_ROOT=1
 115 fi
 116
 117 prompt_for_create
 118
 119 debug_vals() {
 120
 121 echo "Missing the following group / user entries:"
 122 echo "nobody:        $NO_NOBODY_ID"
 123 echo "bin:           $NO_BIN_ID"
 124 echo "daemon:        $NO_DAEMON_ID"
 125 echo "nobody grp:    $NO_NOBODY_GRP"
 126 echo "bin grp:       $NO_BIN_GRP"
 127 echo "daemon grp:    $NO_DAEMON_GRP"
 128 echo "sys grp:       $NO_SYS_GRP"
 129 echo "users grp:     $NO_USERS_GRP"
 130 echo ""
 131 echo "i am root:     $I_AM_ROOT"
 132 echo ""
 133
 134 }
 135
 136 #debug_vals
 137
 138 if [ $CREATE_ENTRIES -ne 0 ] ; then
 139         if ! touch /etc/group ; then
 140                 echo "Couldn't touch /etc/group"
 141                 exit 1
 142         fi
 143 fi
 144
 145 make_user_group() {
 146         local name=$1 id=$2 no_id=$3 no_grp=$4
 147
 148         if [ $no_id -eq 0 -a $no_grp -eq 0 ] ; then
 149                 echo "'$name' user id and group found."
 150         elif [ $CREATE_ENTRIES -ne 0 ] ; then
 151                 echo "Creating entries for $name"
 152
 153                 # Avoid chicken and egg issue with id(1) call
 154                 # made above and below.
 155                 if ! gfe "^${name}:" /etc/passwd && [ $no_id -ne 0 ] ; then
 156                         echo "${name}:x:${id}:${id}:${name}::" >> /etc/passwd
 157                 fi
 158                 if [ $no_grp -ne 0 ] ; then
 159                         echo "${name}:x:$(id -u ${name}):" >> /etc/group
 160                 fi
 161         fi
 162 }
 163 make_user_group nobody 99 $NO_NOBODY_ID $NO_NOBODY_GRP
 164 make_user_group bin 1 $NO_BIN_ID $NO_BIN_GRP
 165 make_user_group daemon 2 $NO_DAEMON_ID $NO_DAEMON_GRP
 166
 167 if [ $NO_USERS_GRP -eq 0 ] ; then
 168         echo "Users group found."
 169 elif [ $CREATE_ENTRIES -ne 0 ] ; then
 170         echo 'users:x:100:' >> /etc/group
 171 fi
 172
 173 if [ $NO_SYS_GRP -eq 0 ] ; then
 174         echo "Sys group found."
 175 elif [ $CREATE_ENTRIES -ne 0 ] ; then
 176         echo 'sys:x:3:' >> /etc/group
 177 fi
 178
 179 if ife nobody    && ife bin    && ife daemon &&
 180    ife -g nobody && ife -g bin && ife -g daemon &&
 181    gfe '^users:' /etc/group && gfe '^sys:' /etc/group &&
 182    gfe '^nobody:' /etc/group
 183 then
 184         echo ""
 185         echo "Required users/groups exist."
 186         exit 0
 187 fi
 188
 189 echo ""
 190 echo "*****************************************"
 191 echo "* Required users/groups do NOT exist!!! *"
 192 echo "*                                       *"
 193 echo "* Some kernel/syscall tests will FAIL!  *"
 194 echo "*****************************************"
 195 exit 1