#!/bin/bash
+chdir=0
kerberos=0
-while getopts ":k" opt; do
+x11=0
+while getopts ":kx" opt; do
case $opt in
- k) kerberos=1
+ c) chdir=1;;
+ k) kerberos=1;;
+ x) x11=1;;
esac
done
shift $((OPTIND-1))
user="$1"; shift
if [ -z "$user" ]; then
- echo >&2 "Usage: become [-k] <user>"
- echo >&2 "Options: -k Delegate Kerberos credentials even if target user is not root."
+ echo >&2 "Usage: become [-c] [-k] [-x] <user>"
+ echo >&2 "Options: -c Stay in current directory even if target user is not root."
+ echo >&2 " -k Delegate Kerberos credentials even if target user is not root."
+ echo >&2 " -x Delegate X11 cookie even if target user is not root."
exit 1
fi
+uid=$(PATH=/usr/xpg4/bin:/usr/bin id -u "$user" 2>/dev/null)
+if [ -z "$uid" ]; then
+ echo >&2 "Who is $user?"
+ exit 2
+fi
+
+if [ $uid = 0 ]; then
+ chdir=1
+ kerberos=1
+ x11=1
+fi
+
PRINCIPAL=$(klist 2>/dev/null | sed -n 's/^Default principal: //p')
-if [ -n "$DISPLAY" -a "${DISPLAY##localhost:}" = "$DISPLAY" ]; then
+if [ $x11 = 1 -a -n "$DISPLAY" -a "${DISPLAY##localhost:}" = "$DISPLAY" ]; then
COOKIE="$(xauth list $DISPLAY)"
fi
BECOME="$HOME/.become"
profile="$BECOME/$user"
[ -f "$profile" ] || profile="$BECOME/all"
-file="$(mktemp)"
-if [ -n "$file" ]; then
- exec 3>"$file"
- exec <"$file"
- rm "$file"
-
+file="${TMPDIR:-/tmp}/$USER.become.$user.$RANDOM.$$"
+umask=$(builtin umask -p)
+builtin umask 077
+if exec 3>"$file" && exec <"$file" && rm "$file"; then
+ builtin $umask
echo >&3 "cd"
echo >&3 "PROFILE_HOME='$HOME'"
if [ -n "$PRINCIPAL" ]; then
else
echo >&3 "unset DISPLAY"
fi
-
- echo >&3 2>/dev/null ". $HOME/.bash_profile"
- [ -f "$BECOME/all" ] && cat >&3 2>/dev/null "$BECOME/all"
- [ -f "$BECOME/$user" ] && cat >&3 2>/dev/null "$BECOME/$user"
+else
+ exit 111
fi
+echo >&3 ". $HOME/.bash_profile"
+[ -f "$BECOME/all" ] && cat >&3 2>/dev/null "$BECOME/all"
+[ -f "$BECOME/$user" ] && cat >&3 2>/dev/null "$BECOME/$user"
+[ $chdir = 1 ] && echo >&3 2>/dev/null "cd - &>/dev/null"
+
+exec 3>&-
dir=$(dirname "$0")
[ "$dir" = "." ] && dir="$PWD"
exec sudo -H -u "$user" "$dir/became"