#	$NetBSD: t_ipsec_l2tp.sh,v 1.9 2020/02/17 08:46:10 ozaki-r Exp $
#
# Copyright (c) 2017 Internet Initiative Japan Inc.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# POSSIBILITY OF SUCH DAMAGE.
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SOCK_LOCAL=unix://ipsec_l2tp_local
SOCK_TUN_LOCAL=unix://ipsec_l2tp_tunel_local
SOCK_TUN_REMOTE=unix://ipsec_l2tp_tunnel_remote
SOCK_REMOTE=unix://ipsec_l2tp_remote
BUS_LOCAL=./bus_ipsec_local
BUS_TUNNEL=./bus_ipsec_tunnel
BUS_REMOTE=./bus_ipsec_remote

DEBUG=${DEBUG:-true}

make_l2tp_pktstr()
{
	local src=$1
	local dst=$2
	local proto=$3
	local ipproto=$4
	local mode=$5
	local proto_cap= proto_str=

	if [ $proto = esp ]; then
		proto_cap=ESP
	else
		proto_cap=AH
		if [ $ipproto = ipv4 ]; then
			if [ $mode = tunnel ]; then
				proto_str="ip-proto-115 102 \(ipip-proto-4\)"
			else
				proto_str="ip-proto-115 102"
			fi
		else
			proto_str="ip-proto-115"
		fi
	fi

	echo "$src > $dst: $proto_cap.+$proto_str"
}

wait_for_all_dad_completions()
{

	for sock in $SOCK_LOCAL $SOCK_TUN_LOCAL $SOCK_TUN_REMOTE $SOCK_REMOTE; do
		export RUMP_SERVER=$sock
		atf_check -s exit:0 rump.ifconfig -w 10
	done
}

test_ipsec4_l2tp()
{
	local mode=$1
	local proto=$2
	local algo=$3
	local ip_local=10.0.0.1
	local ip_gwlo_tun=20.0.0.1
	local ip_gwre_tun=20.0.0.2
	local ip_remote=10.0.0.2
	local subnet_local=20.0.0.0
	local subnet_remote=20.0.0.0
	local tmpfile=./tmp
	local outfile=./out
	local str=
	local algo_args="$(generate_algo_args $proto $algo)"

	# See https://www.netbsd.org/docs/network/ipsec/#sample_vpn
	rump_server_crypto_start $SOCK_LOCAL
	rump_server_crypto_start $SOCK_TUN_LOCAL netipsec l2tp bridge
	rump_server_crypto_start $SOCK_TUN_REMOTE netipsec l2tp bridge
	rump_server_crypto_start $SOCK_REMOTE
	rump_server_add_iface $SOCK_LOCAL shmif0 $BUS_LOCAL
	rump_server_add_iface $SOCK_TUN_LOCAL shmif0 $BUS_LOCAL
	rump_server_add_iface $SOCK_TUN_LOCAL shmif1 $BUS_TUNNEL
	rump_server_add_iface $SOCK_TUN_REMOTE shmif0 $BUS_REMOTE
	rump_server_add_iface $SOCK_TUN_REMOTE shmif1 $BUS_TUNNEL
	rump_server_add_iface $SOCK_REMOTE shmif0 $BUS_REMOTE

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 rump.ifconfig shmif0 $ip_local/24

	export RUMP_SERVER=$SOCK_TUN_LOCAL
	atf_check -s exit:0 rump.ifconfig shmif0 up
	atf_check -s exit:0 rump.ifconfig shmif1 $ip_gwlo_tun/24
	rump_server_add_iface $SOCK_TUN_LOCAL l2tp0
	atf_check -s exit:0 rump.ifconfig l2tp0 \
	    tunnel $ip_gwlo_tun $ip_gwre_tun
	atf_check -s exit:0 rump.ifconfig l2tp0 session 1234 4321
	atf_check -s exit:0 rump.ifconfig l2tp0 up
	rump_server_add_iface $SOCK_TUN_LOCAL bridge0
	atf_check -s exit:0 rump.ifconfig bridge0 up
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add l2tp0
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add shmif0

	export RUMP_SERVER=$SOCK_TUN_REMOTE
	atf_check -s exit:0 rump.ifconfig shmif0 up
	atf_check -s exit:0 rump.ifconfig shmif1 $ip_gwre_tun/24
	rump_server_add_iface $SOCK_TUN_REMOTE l2tp0
	atf_check -s exit:0 rump.ifconfig l2tp0 \
	    tunnel $ip_gwre_tun $ip_gwlo_tun
	atf_check -s exit:0 rump.ifconfig l2tp0 session 4321 1234
	atf_check -s exit:0 rump.ifconfig l2tp0 up
	rump_server_add_iface $SOCK_TUN_REMOTE bridge0
	atf_check -s exit:0 rump.ifconfig bridge0 up
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add l2tp0
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add shmif0

	export RUMP_SERVER=$SOCK_REMOTE
	atf_check -s exit:0 rump.ifconfig shmif0 $ip_remote/24

	wait_for_all_dad_completions

	extract_new_packets $BUS_TUNNEL > $outfile

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 -o ignore rump.ping -c 1 -n -w 3 $ip_remote

	extract_new_packets $BUS_TUNNEL > $outfile
	atf_check -s exit:0 \
	    -o match:"$ip_gwlo_tun > $ip_gwre_tun: +ip-proto-115" \
	    cat $outfile
	atf_check -s exit:0 \
	    -o match:"$ip_gwre_tun > $ip_gwlo_tun: +ip-proto-115" \
	    cat $outfile

	if [ $mode = tunnel ]; then
		export RUMP_SERVER=$SOCK_TUN_LOCAL
		# from https://www.netbsd.org/docs/network/ipsec/
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $subnet_local/24 $subnet_remote/24 any -P out ipsec
		    $proto/tunnel/$ip_gwlo_tun-$ip_gwre_tun/require;
		spdadd $subnet_remote/24 $subnet_local/24 any -P in ipsec
		    $proto/tunnel/$ip_gwre_tun-$ip_gwlo_tun/require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile

		export RUMP_SERVER=$SOCK_TUN_REMOTE
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $subnet_remote/24 $subnet_local/24 any -P out ipsec
		    $proto/tunnel/$ip_gwre_tun-$ip_gwlo_tun/require;
		spdadd $subnet_local/24 $subnet_remote/24 any -P in ipsec
		    $proto/tunnel/$ip_gwlo_tun-$ip_gwre_tun/require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile
	else # transport mode
		export RUMP_SERVER=$SOCK_TUN_LOCAL
		# from https://www.netbsd.org/docs/network/ipsec/
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $ip_gwlo_tun/32 $ip_gwre_tun/32 any -P out ipsec
		    $proto/transport//require;
		spdadd $ip_gwre_tun/32 $ip_gwlo_tun/32 any -P in ipsec
		    $proto/transport//require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile

		export RUMP_SERVER=$SOCK_TUN_REMOTE
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $ip_gwre_tun/32 $ip_gwlo_tun/32 any -P out ipsec
		    $proto/transport//require;
		spdadd $ip_gwlo_tun/32 $ip_gwre_tun/32 any -P in ipsec
		    $proto/transport//require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile
	fi

	check_sa_entries $SOCK_TUN_LOCAL $ip_gwlo_tun $ip_gwre_tun
	check_sa_entries $SOCK_TUN_REMOTE $ip_gwlo_tun $ip_gwre_tun

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 -o ignore rump.ping -c 1 -n -w 3 $ip_remote

	extract_new_packets $BUS_TUNNEL > $outfile
	str=$(make_l2tp_pktstr $ip_gwlo_tun $ip_gwre_tun $proto ipv4 $mode)
	atf_check -s exit:0 -o match:"$str" cat $outfile
	str=$(make_l2tp_pktstr $ip_gwre_tun $ip_gwlo_tun $proto ipv4 $mode)
	atf_check -s exit:0 -o match:"$str" cat $outfile

	test_flush_entries $SOCK_TUN_LOCAL
	test_flush_entries $SOCK_TUN_REMOTE
}

test_ipsec6_l2tp()
{
	local mode=$1
	local proto=$2
	local algo=$3
	local ip_local=fd00::1
	local ip_gwlo_tun=fc00::1
	local ip_gwre_tun=fc00::2
	local ip_remote=fd00::2
	local subnet_local=fc00::
	local subnet_remote=fc00::
	local tmpfile=./tmp
	local outfile=./out
	local str=
	local algo_args="$(generate_algo_args $proto $algo)"

	rump_server_crypto_start $SOCK_LOCAL netinet6
	rump_server_crypto_start $SOCK_TUN_LOCAL netipsec netinet6 l2tp bridge
	rump_server_crypto_start $SOCK_TUN_REMOTE netipsec netinet6 l2tp bridge
	rump_server_crypto_start $SOCK_REMOTE netinet6
	rump_server_add_iface $SOCK_LOCAL shmif0 $BUS_LOCAL
	rump_server_add_iface $SOCK_TUN_LOCAL shmif0 $BUS_LOCAL
	rump_server_add_iface $SOCK_TUN_LOCAL shmif1 $BUS_TUNNEL
	rump_server_add_iface $SOCK_TUN_REMOTE shmif0 $BUS_REMOTE
	rump_server_add_iface $SOCK_TUN_REMOTE shmif1 $BUS_TUNNEL
	rump_server_add_iface $SOCK_REMOTE shmif0 $BUS_REMOTE

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 rump.ifconfig shmif0 inet6 $ip_local/64

	export RUMP_SERVER=$SOCK_TUN_LOCAL
	atf_check -s exit:0 rump.ifconfig shmif0 up
	atf_check -s exit:0 rump.ifconfig shmif1 inet6 $ip_gwlo_tun/64
	rump_server_add_iface $SOCK_TUN_LOCAL l2tp0
	atf_check -s exit:0 rump.ifconfig l2tp0 \
	    tunnel $ip_gwlo_tun $ip_gwre_tun
	atf_check -s exit:0 rump.ifconfig l2tp0 session 1234 4321
	atf_check -s exit:0 rump.ifconfig l2tp0 up
	rump_server_add_iface $SOCK_TUN_LOCAL bridge0
	atf_check -s exit:0 rump.ifconfig bridge0 up
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add l2tp0
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add shmif0

	export RUMP_SERVER=$SOCK_TUN_REMOTE
	atf_check -s exit:0 rump.ifconfig shmif0 up
	atf_check -s exit:0 rump.ifconfig shmif1 inet6 $ip_gwre_tun/64
	rump_server_add_iface $SOCK_TUN_REMOTE l2tp0
	atf_check -s exit:0 rump.ifconfig l2tp0 \
	    tunnel $ip_gwre_tun $ip_gwlo_tun
	atf_check -s exit:0 rump.ifconfig l2tp0 session 4321 1234
	atf_check -s exit:0 rump.ifconfig l2tp0 up
	rump_server_add_iface $SOCK_TUN_REMOTE bridge0
	atf_check -s exit:0 rump.ifconfig bridge0 up
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add l2tp0
	atf_check -s exit:0 $HIJACKING brconfig bridge0 add shmif0

	export RUMP_SERVER=$SOCK_REMOTE
	atf_check -s exit:0 rump.ifconfig shmif0 inet6 $ip_remote

	wait_for_all_dad_completions

	extract_new_packets $BUS_TUNNEL > $outfile

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 -o ignore rump.ping6 -c 1 -n -X 3 $ip_remote

	extract_new_packets $BUS_TUNNEL > $outfile
	atf_check -s exit:0 \
	    -o match:"$ip_gwlo_tun > $ip_gwre_tun: +ip-proto-115" \
	    cat $outfile
	atf_check -s exit:0 \
	    -o match:"$ip_gwre_tun > $ip_gwlo_tun: +ip-proto-115" \
	    cat $outfile

	if [ $mode = tunnel ]; then
		export RUMP_SERVER=$SOCK_TUN_LOCAL
		# from https://www.netbsd.org/docs/network/ipsec/
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $subnet_local/64 $subnet_remote/64 any -P out ipsec
		    $proto/tunnel/$ip_gwlo_tun-$ip_gwre_tun/require;
		spdadd $subnet_remote/64 $subnet_local/64 any -P in ipsec
		    $proto/tunnel/$ip_gwre_tun-$ip_gwlo_tun/require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile

		export RUMP_SERVER=$SOCK_TUN_REMOTE
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $subnet_remote/64 $subnet_local/64 any -P out ipsec
		    $proto/tunnel/$ip_gwre_tun-$ip_gwlo_tun/require;
		spdadd $subnet_local/64 $subnet_remote/64 any -P in ipsec
		    $proto/tunnel/$ip_gwlo_tun-$ip_gwre_tun/require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile
	else # transport mode
		export RUMP_SERVER=$SOCK_TUN_LOCAL
		# from https://www.netbsd.org/docs/network/ipsec/
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $ip_gwlo_tun/128 $ip_gwre_tun/128 any -P out ipsec
		    $proto/transport//require;
		spdadd $ip_gwre_tun/128 $ip_gwlo_tun/128 any -P in ipsec
		    $proto/transport//require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile

		export RUMP_SERVER=$SOCK_TUN_REMOTE
		cat > $tmpfile <<-EOF
		add $ip_gwlo_tun $ip_gwre_tun $proto 10000 $algo_args;
		add $ip_gwre_tun $ip_gwlo_tun $proto 10001 $algo_args;
		spdadd $ip_gwre_tun/128 $ip_gwlo_tun/128 any -P out ipsec
		    $proto/transport//require;
		spdadd $ip_gwlo_tun/128 $ip_gwre_tun/128 any -P in ipsec
		    $proto/transport//require;
		EOF
		$DEBUG && cat $tmpfile
		atf_check -s exit:0 -o empty $HIJACKING setkey -c < $tmpfile
	fi

	check_sa_entries $SOCK_TUN_LOCAL $ip_gwlo_tun $ip_gwre_tun
	check_sa_entries $SOCK_TUN_REMOTE $ip_gwlo_tun $ip_gwre_tun

	export RUMP_SERVER=$SOCK_LOCAL
	atf_check -s exit:0 -o ignore rump.ping6 -c 1 -n -X 3 $ip_remote

	extract_new_packets $BUS_TUNNEL > $outfile
	str=$(make_l2tp_pktstr $ip_gwlo_tun $ip_gwre_tun $proto ipv6 $mode)
	atf_check -s exit:0 -o match:"$str" cat $outfile
	str=$(make_l2tp_pktstr $ip_gwre_tun $ip_gwlo_tun $proto ipv6 $mode)
	atf_check -s exit:0 -o match:"$str" cat $outfile

	test_flush_entries $SOCK_TUN_LOCAL
	test_flush_entries $SOCK_TUN_REMOTE
}

test_ipsec_l2tp_common()
{
	local ipproto=$1
	local mode=$2
	local proto=$3
	local algo=$4

	if [ $ipproto = ipv4 ]; then
		test_ipsec4_l2tp $mode $proto $algo
	else
		test_ipsec6_l2tp $mode $proto $algo
	fi
}

add_test_ipsec_l2tp()
{
	local ipproto=$1
	local mode=$2
	local proto=$3
	local algo=$4
	local _algo=$(echo $algo | sed 's/-//g')
	local name= desc=

	name="ipsec_l2tp_${ipproto}_${mode}_${proto}_${_algo}"
	desc="Tests of l2tp/IPsec ($ipproto) ${mode} mode with $proto ($algo)"

	atf_test_case ${name} cleanup
	eval "
	    ${name}_head() {
	        atf_set descr \"$desc\"
	        atf_set require.progs rump_server setkey
	    }
	    ${name}_body() {
	        test_ipsec_l2tp_common $ipproto $mode $proto $algo
	        rump_server_destroy_ifaces
	    }
	    ${name}_cleanup() {
	        \$DEBUG && dump
	        cleanup
	    }
	"
	atf_add_test_case ${name}
}

atf_init_test_cases()
{
	local algo=

	for algo in $ESP_ENCRYPTION_ALGORITHMS_MINIMUM; do
		add_test_ipsec_l2tp ipv4 tunnel esp $algo
		add_test_ipsec_l2tp ipv6 tunnel esp $algo
		add_test_ipsec_l2tp ipv4 transport esp $algo
		add_test_ipsec_l2tp ipv6 transport esp $algo
	done

	for algo in $AH_AUTHENTICATION_ALGORITHMS_MINIMUM; do
		add_test_ipsec_l2tp ipv4 tunnel ah $algo
		add_test_ipsec_l2tp ipv6 tunnel ah $algo
		add_test_ipsec_l2tp ipv4 transport ah $algo
		add_test_ipsec_l2tp ipv6 transport ah $algo
	done
}