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-rwxr-xr-xarctica-guest-account-script.in229
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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
+
+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 "${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 --shell /bin/bash ${GUEST_USER} || {
+ rm -rf ${GUEST_HOME}
+ exit 1
+ }
+ fi
+
+ dist_gs=/usr/share/arctica-greeter/guest-session
+ site_gs=/etc/arctica-greeter/guest-session
+
+ # create temporary home directory
+ mount -t tmpfs -o mode=700,uid=${GUEST_USER} none ${GUEST_HOME} || {
+ rm -rf ${GUEST_HOME}
+ exit 1
+ }
+
+ if [ -d ${site_gs}/skel ] && [ "$(ls -A ${site_gs}/skel)" ]; then
+ # Only perform union-mounting if BindFS is available
+ if [ -x /usr/bin/bindfs ]; then
+ bindfs_mount=true
+
+ # Try OverlayFS first
+ if modinfo -n overlay >/dev/null 2>&1; then
+ mkdir ${GUEST_HOME}/upper ${GUEST_HOME}/work
+ chown ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}/upper ${GUEST_HOME}/work
+
+ mount -t overlay -o lowerdir=${dist_gs}/skel:${site_gs}/skel,upperdir=${GUEST_HOME}/upper,workdir=${GUEST_HOME}/work overlay ${GUEST_HOME} || {
+ umount ${GUEST_HOME}
+ rm -rf ${GUEST_HOME}
+ exit 1
+ }
+ # If OverlayFS is not available, try AuFS
+ elif [ -x /sbin/mount.aufs ]; then
+ mount -t aufs -o br=${GUEST_HOME}:${dist_gs}/skel:${site_gs}/skel none ${GUEST_HOME} || {
+ umount ${GUEST_HOME}
+ rm -rf ${GUEST_HOME}
+ exit 1
+ }
+ # If none of them is available, fall back to copy over
+ else
+ cp -rT ${site_gs}/skel/ ${GUEST_HOME}
+ cp -rT ${dist_gs}/skel/ ${GUEST_HOME}
+ chown -R ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}
+ bindfs_mount=false
+ fi
+
+ if ${bindfs_mount}; then
+ # Wrap ${GUEST_HOME} in a BindFS mount, so that
+ # ${GUEST_USER} will be seen as the owner of ${GUEST_HOME}'s contents.
+ bindfs -u ${GUEST_USER} -g ${GUEST_USER} ${GUEST_HOME} ${GUEST_HOME} || {
+ umount ${GUEST_HOME} # union mount
+ umount ${GUEST_HOME} # tmpfs mount
+ rm -rf ${GUEST_HOME}
+ exit 1
+ }
+ fi
+ # If BindFS is not available, just fall back to copy over
+ else
+ cp -rT ${site_gs}/skel/ ${GUEST_HOME}
+ cp -rT ${dist_gs}/skel/ ${GUEST_HOME}
+ chown -R ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}
+ fi
+ else
+ cp -rT /etc/skel/ ${GUEST_HOME}
+ cp -rT ${dist_gs}/skel/ ${GUEST_HOME}
+ chown -R ${GUEST_USER}:${GUEST_USER} ${GUEST_HOME}
+ fi
+
+ # setup session
+ su ${GUEST_USER} -c "env HOME=${GUEST_HOME} site_gs=${site_gs} @pkglibexecdir@/arctica-guest-session-setup"
+
+ # set possible local guest session preferences
+ source_local_prefs() {
+ local USER=${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 # BindFS mount
+ umount ${GUEST_HOME} || umount -l ${GUEST_HOME} || true # union mount
+ 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