#!/usr/share/ucs-test/runner bash
# shellcheck shell=bash
## desc: Check user with many groups using /bin/ps and NFS
## exposure: dangerous
## bugs: [34596,34597]
set -e -u

# add enough groups to overflow the buffer ~770 + G * strlen(" 50xx") >> 1024
# used by ps to read /proc/*/status.
GCOUNT=200
USER="testuser$$"

# shellcheck source=../../lib/base.sh
. "$TESTLIBPATH/base.sh" || exit 137

main () {
	check_not_exists
	prepare_container
	trap on_exit EXIT
	create_groups_and_user
	wait_setup_complete
	test_ps
	if check_nfs
	then
		test_nfs
	fi
	return "$RETVAL"
}

check_not_exists () {
	getent passwd "$USER" && fail_fast 1 "User '$USER' already exists"
	home="/home/$USER"
	[ -d "$home" ] && fail_fast 1 "Directory '$home' already exists"
	return 0
}

prepare_container () {
	udm-test container/cn create --set name="test$$" ||
		fail_fast 1 "Container already exists"
	base="cn=test$$,$(ucr get ldap/base)"
}

on_exit () {
	[ -t 0 ] && read -rp "Hit key to continue with cleanup"
	mountpoint -q "${home}/in" && umount -f "${home}/in"
	exportfs -u -v localhost:"${home}/out" && :
	udm container/cn remove --recursive --dn "$base" && :
	rm -rf "$home" && :
	wait_for_replication_and_postrun
}

create_groups_and_user () {
	declare -a group_dns=()
	for ((g=0; g<GCOUNT; g++))
	do
		gname="testgroup${g}"
		udm-test groups/group create --position "$base" --set name="$gname" ||
			fail_fast 1 "Group already exists"
		group_dns+=(--set groups="cn=$gname,$base")
	done

	udm-test users/user create \
		--position "$base" \
		--set username="$USER" \
		--set lastname="$USER" \
		--set password="univention" \
		--set unixhome="$home" \
		"${group_dns[@]}" ||
		fail_fast 1 "User already exists"
}

wait_setup_complete () {
	wait_for_replication_and_postrun
	info "wait for '/usr/lib/univention-directory-listener/system/nss.py' to call 'ldap-group-to-file'"
	for ((t=600;t>=0;t--))
	do
		g="$(id -G "$USER" | wc -w)"
		printf '[%02d] %d < %d\n' "$t" "$g" "$GCOUNT"
		[ "$g" -ge "$GCOUNT" ] && return
		sleep 1
	done
	fail_test 1 "user '$USER' is missing its groups"
}

test_ps () {
	section "testing procps..."
	su -c 'cat /proc/self/status;timeout 5s /bin/ps aux' - "$USER" ||
		fail_test $? "/bin/ps exited with rv=$? (124=TIMEOUT 128+15=SIGSEGV)"
}

check_nfs () {
	set -e
	checkpkg nfs-common
	checkpkg nfs-kernel-server
	# restart mountd since the error message is only printed once
	/etc/init.d/nfs-kernel-server restart
	/etc/init.d/nfs-kernel-server status
}

test_nfs () {
	section "Testing NFS..."
	pid=$(pidof rpc.mountd)
	install -d -o "$USER" -g "$gname" "${home}/out" "${home}/in"
	exportfs -i -v -o sync,ro,root_squash,wdelay localhost:"${home}/out"
	mount -t nfs localhost:"${home}/out" "${home}/in"
	# shellcheck disable=SC2015
	timeout 5s su -c "cd '${home}/in'&&ls -al" - "$USER" &&
		! grep "mountd\[${pid}\]: qword_eol: fflush failed: errno 22" /var/log/daemon.log ||
		fail_test $? "cd NFS exited with rv=$? (124=TIMEOUT 128+15=SIGSEGV)"
}

main "$@"
