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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
# adapted for Arch Linux by Stefan Melmuk
#
# 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
export TEXTDOMAIN=lightdm
# set the system wide locale for gettext calls
if [ -f /etc/locale.conf ]; then
. /etc/locale.conf
LANGUAGE=
export LANG LANGUAGE
fi
is_system_user ()
{
UID_MIN=$(cat /etc/login.defs | grep '^UID_MIN' | awk '{print $2}')
SYS_UID_MIN=$(cat /etc/login.defs | grep SYS_UID_MIN | awk '{print $2}')
SYS_UID_MAX=$(cat /etc/login.defs | grep SYS_UID_MAX | awk '{print $2}')
SYS_UID_MIN=${SYS_UID_MIN:-101}
SYS_UID_MAX=${SYS_UID_MAX:-$(( UID_MIN - 1 ))}
[ ${1} -ge ${SYS_UID_MIN} ] && [ ${1} -le ${SYS_UID_MAX} ]
}
add_account ()
{
temp_home=$(mktemp -td guest-XXXXXX)
GUEST_HOME=$(echo ${temp_home} | tr '[:upper:]' '[:lower:]')
GUEST_USER=${GUEST_HOME#/tmp/}
if [ "${GUEST_HOME}" != "${temp_home}" ]; then
mkdir -m 700 "${GUEST_HOME}" || {
echo "Failed to create ${GUEST_USER}'s home directory (${GUEST_HOME})"
exit 1
}
rmdir "${temp_home}"
fi
# if ${GUEST_USER} already exists, it must be a locked system account with no existing
# home directory
if PWSTAT=$(passwd -S ${GUEST_USER} 2>/dev/null); then
if [ $(echo ${PWSTAT} | cut -f2 -d' ') != L ]; then
echo "User account ${GUEST_USER} already exists and is not locked"
exit 1
fi
PWENT=$(getent passwd ${GUEST_USER}) || {
echo "getent passwd ${GUEST_USER} failed"
exit 1
}
GUEST_UID=$(echo ${PWENT} | cut -f3 -d:)
if ! is_system_user ${GUEST_UID}; then
echo "Account ${GUEST_USER} is not a system user"
exit 1
fi
GUEST_HOME=$(echo ${PWENT} | cut -f6 -d:)
if [ ${GUEST_HOME} != / ] && [ ${GUEST_HOME#/tmp} = ${GUEST_HOME} ] && [ -d ${GUEST_HOME} ]; then
echo "Home directory of ${GUEST_USER} already exists"
exit 1
fi
else
# does not exist, so create it
useradd --system \
--home-dir ${GUEST_HOME} \
--comment $(gettext "Guest") \
--user-group -G autologin \
--shell /bin/bash \
${GUEST_USER} || {
rm -rf ${GUEST_HOME}
exit 1
}
fi
site_gs=/etc/guest-session
# create temporary home directory
mount -t tmpfs -o mode=700,uid=${GUEST_USER} none ${GUEST_HOME} || {
rm -rf ${GUEST_HOME}
exit 1
}
if [ -d ${site_gs}/skel ] && [ "$(ls -A ${site_gs}/skel)" ]; then
cp -rT ${site_gs}/skel/ ${GUEST_HOME}
chown -R ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}
else
cp -rT /etc/skel/ ${GUEST_HOME}
chown -R ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}
fi
# setup session
if [ -f ${site_gs}/setup.sh ]; then
su ${GUEST_USER} -c "env HOME=${GUEST_HOME} site_gs=${site_gs} ${site_gs}/setup.sh"
fi
# set possible local guest session preferences
source_local_prefs() {
local USER=${GUEST_USER}
local HOME=${GUEST_HOME}
. ${site_gs}/prefs.sh
chown -R ${USER}:${USER} ${HOME}
}
if [ -f ${site_gs}/prefs.sh ]; then
source_local_prefs
fi
echo ${GUEST_USER}
}
remove_account ()
{
GUEST_USER=${1}
PWENT=$(getent passwd ${GUEST_USER}) || {
echo "Error: invalid user ${GUEST_USER}"
exit 1
}
GUEST_UID=$(echo ${PWENT} | cut -f3 -d:)
if ! is_system_user ${GUEST_UID}; then
echo "Error: user ${GUEST_USER} is not a system user."
exit 1
fi
GUEST_HOME=$(echo ${PWENT} | cut -f6 -d:)
# kill all remaining processes
if [ -x /bin/loginctl ] || [ -x /usr/bin/loginctl ]; then
loginctl --signal=9 kill-user ${GUEST_USER} >/dev/null || true
else
while ps h -u ${GUEST_USER} >/dev/null
do
killall -9 -u ${GUEST_USER} || true
sleep 0.2;
done
fi
if [ ${GUEST_HOME} = ${GUEST_HOME#/tmp/} ]; then
echo "Warning: home directory ${GUEST_HOME} is not in /tmp/. It won't be removed."
else
umount ${GUEST_HOME} || umount -l ${GUEST_HOME} || true # tmpfs mount
rm -rf ${GUEST_HOME}
fi
# remove leftovers in /tmp
find /tmp -mindepth 1 -maxdepth 1 -uid ${GUEST_UID} -print0 | xargs -0 rm -rf || true
# remove possible {/run,}/media/guest-XXXXXX folder
for media_dir in /run/media/${GUEST_USER} /media/${GUEST_USER}; do
if [ -d ${media_dir} ]; then
for dir in $(find ${media_dir} -mindepth 1 -maxdepth 1); do
umount ${dir} || true
done
rmdir ${media_dir} || true
fi
done
userdel --force ${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"
echo " ${0} remove [account]"
exit 1
esac
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