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

VOLUME=
SEARCH=
RESULT=
REAL_ACCOUNT=
WAIT=
TMPDEL=
LOGFILES=
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 " ${PERSISTENT_HOME_DIR} " /proc/mounts
	}
	# Most servers can work without, but some don't
	XDOMAIN=
	if [ -s "/opt/openslx/inc/shares" ]; then
		. /opt/openslx/inc/shares
		XDOMAIN="${SHARE_DOMAIN}"
	fi
	if [ -z "$XDOMAIN" ]; then
		XDOMAIN=$(<"/etc/ldap.conf" grep -m1 -i '^BASE\s.*DC=' | grep -o -E -i 'DC=([^,;]+)' | head -n 1 | cut -c 4-)
	fi
	if [ -z "$XDOMAIN" ]; then
		XDOMAIN=$(<"/etc/sssd/sssd.conf" grep -m1 -i '^ldap_search_base\s*=.*DC=' | grep -o -E -i 'DC=[^,;]+' | head -n 1 | cut -c 4-)
	fi
	if [ "x$XDOMAIN" = "x#" ]; then
		XDOMAIN=
	fi
	# Remember for hooks in pam_script_auth.d
	export PERSISTENT_NETPATH=$(echo "$VOLUME" | tr '/' '\')

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

	# We try 7 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" "vers=2.0,sec=ntlmssp"; do
		# Also we try with and without explicit domain argument
		for dom in "#" $XDOMAIN; do # No quotes
			[ "x$dom" != "x#" ] && opt="${opt},domain=$dom"
			CNT=$(( CNT + 1 ))
			FILE=$(mktemp)
			LOGFILES="$LOGFILES $FILE"
			MOUNT_OPTS="-v -t cifs -o uid=${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=$!
			# Wait max. 1 second; remember PID if this mount call seems to be running after we stop waiting
			for waits in 1 2 3 4; do
				usleep 250000
				if isHomeMounted; then
					# A previously invoked mount call might have succeeded while this one is still running; try to stop it right away
					kill "$PID" &> /dev/null
					break 3
				fi
				kill -0 "$PID" || break
			done
			kill -0 "$PID" && PIDS="$PIDS $PID" # Remember all PIDs
		done
	done

	if [ -n "$PIDS" ]; then
		CNT=0
		while ! isHomeMounted && [ "$CNT" -lt 10 ] && kill -0 $PIDS; do # No quotes
			usleep 333000
			CNT=$(( CNT + 1 ))
		done
		kill -9 $PIDS # Kill any leftovers; No quotes
	fi

	if ! isHomeMounted; then
		LOG_COMBINED=$(mktemp)
		[ -n "$LOGFILES" ] && cat ${LOGFILES} > "$LOG_COMBINED" # No quotes
		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 "${TMPDEL}${LOGFILES}" ] && rm -f -- ${TMPDEL} ${LOGFILES} # No quotes
true