###################################################################
#
#       This script is a part of the pam_script_ses_open script
#       and is not stand-alone!
#

VOLUME=
SEARCH=
RESULT=
REAL_ACCOUNT=
WAIT=
TMPDEL=
if ! grep -q "^${PAM_USER}:" "/etc/passwd"; then
	if which gawk &>/dev/null; then
		un64() {
			gawk 'BEGIN{FS=":: "}{c="base64 -d";if(/^\w+:: /) {print $2 |& c; close(c,"to"); c |& getline $2; close(c); printf("%s: %s\n", $1, $2); next} print $0 }'
		}
	else
		un64() {
			cat
		}
	fi
	# determine fileserver and share for home directories
	SEARCH=$(mktemp)
	TMPDEL="$TMPDEL $SEARCH"
	ldapsearch -l 3 -o nettimeout=3 -o ldif-wrap=no -x -LLL uid="${PAM_USER}" dn distinguishedName homeMount realAccount > "${SEARCH}" 2>&1
	BINDDN=$(cat "${SEARCH}" | grep -E '^(dn|distinguishedName):' | un64 | head -n 1 | cut -d ' ' -f 2-)
	if [ -z "$BINDDN" ]; then
		slxlog "pam-ad-ldapquery" "Could not query DN of user ${PAM_USER}. No home directory available" "${SEARCH}"
		WAIT=1
	else
		RESULT=$(mktemp)
		TMPDEL="$TMPDEL $RESULT"
		PW="/tmp/pw.${RANDOM}.${RANDOM}.${PAM_USER}.${RANDOM}"
		mkfifo -m 0600 "${PW}" || slxlog "pam-ad-fifo" "Could not create FIFO at ${PW}"
		(
			echo -n "${PAM_AUTHTOK}" > "${PW}"
		) &
		if ! ldapsearch -y "${PW}" -D "$BINDDN" -l 5 -o nettimeout=5 -o ldif-wrap=no -x -LLL uid="${PAM_USER}" homeMount realAccount > "${RESULT}" 2>&1; then
			slxlog "pam-ad-ldapquery" "Could not query LDAP-AD-Proxy for parameters of user '${PAM_USER}' (${BINDDN})." "${RESULT}"
			WAIT=1
		fi
		rm -f -- "${PW}"
		VOLUME=$(cat "${RESULT}" | grep '^homeMount:' | head -n 1 | cut -d ' ' -f 2-)
		[ -z "$REAL_ACCOUNT" ] && REAL_ACCOUNT=$(cat "${RESULT}" | grep '^realAccount:' | head -n 1 | cut -d ' ' -f 2)
	fi
	[ -z "$VOLUME" ] && VOLUME=$(cat "${SEARCH}" | grep '^homeMount:' | head -n 1 | cut -d ' ' -f 2-)
	[ -z "$VOLUME" ] && slxlog "pam-ad-ldapvolume" "AD/Proxy did not provide 'homeMount'. Aborting mount for ${PAM_USER}." "${RESULT}"
	[ -z "$REAL_ACCOUNT" ] && REAL_ACCOUNT=$(cat "${SEARCH}" | grep '^realAccount:' | head -n 1 | cut -d ' ' -f 2)
	[ -z "$REAL_ACCOUNT" ] && REAL_ACCOUNT="${PAM_USER}"
fi

if [ -n "${VOLUME}" ]; then
	isHomeMounted() {
		grep -Fuq " ${PERSISTENT_HOME_DIR} " /proc/mounts
	}
	# Remember for hooks in pam_script_auth.d
	export PERSISTENT_NETPATH=$(echo "$VOLUME" | tr '/' '\')

	export USER="${REAL_ACCOUNT}"
	export PASSWD="${PAM_AUTHTOK}"

	# We try 6 different mount option combinations; launch them in 1 second steps until one of them succeeds
	CNT=0
	PIDS=
	for opt in "vers=3.0,sec=ntlmssp" "vers=2.1,sec=ntlmssp" "vers=1.0,sec=ntlm" "vers=3.0,sec=ntlmv2" "vers=1.0,sec=ntlmv2" "vers=3.0,sec=ntlm"; do
		CNT=$(( CNT + 1 ))
		FILEVAR="LOG$CNT"
		FILE=$(mktemp)
		eval "${FILEVAR}=$FILE"
		TMPDEL="$TMPDEL $FILE"
		MOUNT_OPTS="-v -t cifs -o uid=${USER_UID},gid=${USER_GID},forceuid,forcegid,${opt},nounix,file_mode=0700,dir_mode=0700,noacl,nobrl"
		echo " * Trying '$opt'" > "$FILE"
		mount ${MOUNT_OPTS} "${VOLUME}" "${PERSISTENT_HOME_DIR}" >> "${FILE}" 2>&1 &
		PID=$!
		PIDS="$PIDS $PID" # Remember all PIDs
		usleep 250000
		kill -0 "$PID" && usleep 250000
		kill -0 "$PID" && usleep 250000
		kill -0 "$PID" && usleep 250000
		isHomeMounted && break
	done

	while ! isHomeMounted && [ "$CNT" -lt 10 ] && kill -0 $PIDS; do # No quotes
		sleep 1
		CNT=$(( CNT + 1 ))
	done
	kill -9 $PIDS # Kill any leftovers; No quotes

	if ! isHomeMounted; then
		LOG_COMBINED=$(mktemp)
		cat "$LOG1" "$LOG2" "$LOG3" "$LOG4" "$LOG5" "$LOG6" > "$LOG_COMBINED"
		slxlog --delete "pam-ad-mount" "Mount of '${VOLUME}' to '${PERSISTENT_HOME_DIR}' failed." "${LOG_COMBINED}"
	else
		PERSISTENT_OK=yes
		#chmod -R u+rwX "${PERSISTENT_HOME_DIR}" 2>/dev/null TODO: Still needed? Use & maybe?
	fi

	unset USER
	unset PASSWD
fi

[ -n "${TMPDEL}" ] && rm -f -- ${TMPDEL} # No quotes
true