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|
#!/bin/sh -e
# (C) 2008 Canonical Ltd.
# Author: Martin Pitt <martin.pitt@ubuntu.com>
# License: GPL v2 or later
# modified by David D Lowe and Thomas Detoux
#
# Setup user and temporary home directory for guest session.
# If this succeeds, this script needs to print the username as the last line to
# stdout.
export TEXTDOMAINDIR=/usr/share/locale-langpack
export TEXTDOMAIN=lightdm
# set the system wide locale for gettext calls
if [ -f /etc/default/locale ]; then
. /etc/default/locale
LANGUAGE=
export LANG LANGUAGE
fi
add_account ()
{
HOME=`mktemp -td guest-XXXXXX`
USER=`echo $HOME | sed 's/\(.*\)guest/guest/'`
PRE_HOME="/tmp/.pre-${USER}"
# if $USER already exists, it must be a locked system account with no existing
# home directory
if PWSTAT=`passwd -S "$USER"` 2>/dev/null; then
if [ "`echo \"$PWSTAT\" | cut -f2 -d\ `" != "L" ]; then
echo "User account $USER already exists and is not locked"
exit 1
fi
PWENT=`getent passwd "$USER"` || {
echo "getent passwd $USER failed"
exit 1
}
GUEST_UID=`echo "$PWENT" | cut -f3 -d:`
if [ "$GUEST_UID" -ge 500 ]; then
echo "Account $USER is not a system user"
exit 1
fi
HOME=`echo "$PWENT" | cut -f6 -d:`
if [ "$HOME" != / ] && [ "${HOME#/tmp}" = "$HOME" ] && [ -d "$HOME" ]; then
echo "Home directory of $USER already exists"
exit 1
fi
else
# does not exist, so create it
adduser --system --no-create-home --home / --gecos $(gettext "Guest") --group --shell /bin/bash $USER || {
umount "$HOME"
rm -rf "$HOME"
umount "$PRE_HOME"
rm -rf "$PRE_HOME"
exit 1
}
fi
gs_skel=/etc/guest-session/skel/
if [ -d "$gs_skel" ] && [ -n "`find $gs_skel -type f`" ]; then
# Only perform union-mounting if BindFS is available
if [ -x /usr/bin/bindfs ]; then
# create temporary home directory
mkdir "$PRE_HOME"
mount -t tmpfs -o mode=700 none "$PRE_HOME" || { rm -rf "$PRE_HOME" "$HOME"; exit 1; }
mkdir ${PRE_HOME}/lower ${PRE_HOME}/upper
chown -R $USER:$USER "$PRE_HOME"
# Wrap ${gs_skel} in a BindFS mount, so that
# guest account will see itself as the owner of ${gs_skel}'s contents.
bindfs -M $USER $gs_skel ${PRE_HOME}/lower || {
rm -rf "$PRE_HOME"
rm -rf "$HOME"
exit 1
}
# Try OverlayFS first
if modinfo -n overlay >/dev/null 2>&1; then
mkdir ${PRE_HOME}/work
chown $USER:$USER ${PRE_HOME}/work
mount -t overlay -o lowerdir=${PRE_HOME}/lower,upperdir=${PRE_HOME}/upper,workdir=${PRE_HOME}/work overlay $HOME || {
umount ${PRE_HOME}/lower
umount "$PRE_HOME"
rm -rf "$PRE_HOME"
rm -rf "$HOME"
exit 1
}
# If OverlayFS is not available, try AuFS
elif [ -x /sbin/mount.aufs ]; then
mount -t aufs -o br=${PRE_HOME}/upper:${PRE_HOME}/lower none $HOME || {
umount ${PRE_HOME}/lower
umount "$PRE_HOME"
rm -rf "$PRE_HOME"
rm -rf "$HOME"
exit 1
}
# If none of them is available, fall back to copy over
else
umount ${PRE_HOME}/lower
umount "$PRE_HOME"
rm -rf "$PRE_HOME"
mount -t tmpfs -o mode=700 none "$HOME" || { rm -rf "$HOME"; exit 1; }
cp -rT $gs_skel "$HOME"
chown -R $USER:$USER "$HOME"
fi
# If BindFS is not available, just fall back to copy over
else
mount -t tmpfs -o mode=700 none "$HOME" || { rm -rf "$HOME"; exit 1; }
cp -rT $gs_skel "$HOME"
chown -R $USER:$USER "$HOME"
fi
else
mount -t tmpfs -o mode=700 none "$HOME" || { rm -rf "$HOME"; exit 1; }
cp -rT /etc/skel/ "$HOME"
chown -R $USER:$USER "$HOME"
fi
usermod -d "$HOME" "$USER"
#
# setup session
#
# disable some services that are unnecessary for the guest session
mkdir --parents "$HOME"/.config/autostart
cd /etc/xdg/autostart/
services="jockey-kde.desktop jockey-gtk.desktop update-notifier.desktop user-dirs-update-gtk.desktop"
for service in $services
do
if [ -e /etc/xdg/autostart/"$service" ] ; then
cp "$service" "$HOME"/.config/autostart
echo "X-GNOME-Autostart-enabled=false" >> "$HOME"/.config/autostart/"$service"
fi
done
# disable Unity shortcut hint
mkdir -p "$HOME"/.cache/unity
touch "$HOME"/.cache/unity/first_run.stamp
STARTUP="$HOME"/.config/autostart/startup-commands.desktop
echo "[Desktop Entry]" > $STARTUP
echo "Name=Startup commands" >> $STARTUP
echo "Type=Application" >> $STARTUP
echo "NoDisplay=true" >> $STARTUP
echo "Exec=/usr/lib/lightdm/guest-session-auto.sh" >> $STARTUP
echo "export DIALOG_SLEEP=4" >> "$HOME"/.profile
mkdir -p "$HOME"/.kde/share/config
echo "[Basic Settings]" >> "$HOME"/.kde/share/config/nepomukserverrc
echo "Start Nepomuk=false" >> "$HOME"/.kde/share/config/nepomukserverrc
echo "[Event]" >> "$HOME"/.kde/share/config/notificationhelper
echo "hideHookNotifier=true" >> "$HOME"/.kde/share/config/notificationhelper
echo "hideInstallNotifier=true" >> "$HOME"/.kde/share/config/notificationhelper
echo "hideRestartNotifier=true" >> "$HOME"/.kde/share/config/notificationhelper
# Load restricted session
#dmrc='[Desktop]\nSession=guest-restricted'
#/bin/echo -e "$dmrc" > "$HOME"/.dmrc
# set possible local guest session preferences
if [ -f /etc/guest-session/prefs.sh ]; then
. /etc/guest-session/prefs.sh
fi
chown -R $USER:$USER "$HOME"
echo $USER
}
remove_account ()
{
GUEST_USER=$1
PWENT=`getent passwd "$GUEST_USER"` || {
echo "Error: invalid user $GUEST_USER"
exit 1
}
GUEST_UID=`echo "$PWENT" | cut -f3 -d:`
GUEST_HOME=`echo "$PWENT" | cut -f6 -d:`
GUEST_PRE_HOME=/tmp/.rw-$GUEST_USER
if [ "$GUEST_UID" -ge 500 ]; then
echo "Error: user $GUEST_USER is not a system user."
exit 1
fi
if [ "${GUEST_HOME}" = "${GUEST_HOME#/tmp/}" ]; then
echo "Error: home directory $GUEST_HOME is not in /tmp/."
exit 1
fi
# kill all remaining processes
while ps h -u "$GUEST_USER" >/dev/null; do
killall -9 -u "$GUEST_USER" || true
sleep 0.2;
done
umount "$GUEST_HOME" || umount -l "$GUEST_HOME" || true
rm -rf "$GUEST_HOME"
umount ${GUEST_PRE_HOME}/lower || umount -l ${GUEST_PRE_HOME}/lower || true
umount "$GUEST_PRE_HOME" || umount -l "$GUEST_PRE_HOME" || true
rm -rf "$GUEST_PRE_HOME"
# remove leftovers in /tmp
find /tmp -mindepth 1 -maxdepth 1 -uid "$GUEST_UID" -print0 | xargs -0 rm -rf || true
# remove possible /media/guest-XXXXXX folder
if [ -d /media/"$GUEST_USER" ]; then
for dir in $( find /media/"$GUEST_USER" -mindepth 1 -maxdepth 1 ); do
umount "$dir" || true
done
rmdir /media/"$GUEST_USER" || true
fi
deluser --system "$GUEST_USER"
}
case "$1" in
add)
add_account
;;
remove)
if [ -z $2 ] ; then
echo "Usage: $0 remove [account]"
exit 1
fi
remove_account $2
;;
*)
echo "Usage: $0 add|remove"
exit 1
esac
|
