testing: Add ikev2/host2host-transport-nat scenario

testing/tests/ikev2/host2host-transport-nat/description.txt

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+An IPsec <b>transport-mode</b> connection between the natted host <b>alice</b> and gateway <b>sun</b>
+is successfully set up. <b>leftfirewall=yes</b> automatically inserts iptables-based firewall
+rules that let pass the decrypted IP packets. In order to test the host-to-host connection
+<b>alice</b> pings <b>sun</b>.<br/>
+<b>Note:</b> This scenario also demonstrates two problems with transport-mode and NAT traversal:
+<ol>
+<li>The client <b>venus</b> behind the same NAT as client <b>alice</b> is not able to ping <b>sun</b>
+(even with ICMP explicitly allowed there) because the request arrives unencrypted and thus gets
+dropped when the IPsec policies are consulted (increases the <em>XfrmInTmplMismatch</em> counter
+in <em>/proc/net/xfrm_stat</em>).</li>
+<li>A similar issue arises when <b>venus</b> also establishes an IPsec <b>transport-mode</b> connection to
+<b>sun</b>, due to the conflicting IPsec policies <b>sun</b> declines such a connection.</li>
+</ol>

testing/tests/ikev2/host2host-transport-nat/evaltest.dat

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+alice::ipsec status 2> /dev/null::nat-t.*ESTABLISHED.*alice@strongswan.org.*sun.strongswan.org::YES
+sun:: ipsec status 2> /dev/null::nat-t.*ESTABLISHED.*sun.strongswan.org.*alice@strongswan.org::YES
+alice::ipsec status 2> /dev/null::nat-t.*INSTALLED, TRANSPORT::YES
+sun:: ipsec status 2> /dev/null::nat-t.*INSTALLED, TRANSPORT::YES
+alice::ping -c 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_req=1::YES
+venus::ping -c 1 -W 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_req=1::NO
+venus::ipsec up nat-t::received TS_UNACCEPTABLE notify::YES
+sun::cat /var/log/daemon.log::unable to install policy::YES
+sun::tcpdump::IP moon.strongswan.org.* > sun.strongswan.org.*: UDP::YES
+sun::tcpdump::IP sun.strongswan.org.* > moon.strongswan.org.*: UDP::YES
+sun::tcpdump::IP moon.strongswan.org > sun.strongswan.org: ICMP echo request::YES
+sun::tcpdump::IP sun.strongswan.org > moon.strongswan.org: ICMP echo reply::NO

testing/tests/ikev2/host2host-transport-nat/hosts/alice/etc/ipsec.conf

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+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	ikelifetime=60m
+	keylife=20m
+	rekeymargin=3m
+	keyingtries=1
+
+conn nat-t
+	leftcert=aliceCert.pem
+	leftid=alice@strongswan.org
+	leftfirewall=yes
+	right=192.168.0.2
+	rightid=@sun.strongswan.org
+	type=transport
+	auto=add

testing/tests/ikev2/host2host-transport-nat/hosts/sun/etc/ipsec.conf

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+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	ikelifetime=60m
+	keylife=20m
+	rekeymargin=3m
+	keyingtries=1
+	left=192.168.0.2
+	leftcert=sunCert.pem
+	leftid=@sun.strongswan.org
+	leftfirewall=yes
+
+conn nat-t
+	right=%any
+	type=transport
+	auto=add

testing/tests/ikev2/host2host-transport-nat/hosts/sun/etc/iptables.rules

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+*filter
+
+# default policy is DROP
+-P INPUT DROP
+-P OUTPUT DROP
+-P FORWARD DROP
+
+# allow IKE
+-A INPUT  -i eth0 -p udp --dport 500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 500 -j ACCEPT
+
+# allow MobIKE
+-A INPUT  -i eth0 -p udp --dport 4500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 4500 -j ACCEPT
+
+# allow ssh
+-A INPUT  -p tcp --dport 22 -j ACCEPT
+-A OUTPUT -p tcp --sport 22 -j ACCEPT
+
+# allow crl fetch from winnetou
+-A INPUT  -i eth0 -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
+-A OUTPUT -o eth0 -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT
+
+# allow ICMP
+-A INPUT  -i eth0 -p icmp -j ACCEPT
+-A OUTPUT -o eth0 -p icmp -j ACCEPT
+
+COMMIT

testing/tests/ikev2/host2host-transport-nat/hosts/venus/etc/ipsec.conf

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+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	ikelifetime=60m
+	keylife=20m
+	rekeymargin=3m
+	keyingtries=1
+
+conn nat-t
+	leftcert=venusCert.pem
+	leftid=venus@strongswan.org
+	leftfirewall=yes
+	right=192.168.0.2
+	rightid=@sun.strongswan.org
+	type=transport
+	auto=add

testing/tests/ikev2/host2host-transport-nat/posttest.dat

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+alice::ipsec stop
+venus::ipsec stop
+sun::ipsec stop
+alice::iptables-restore < /etc/iptables.flush
+moon::iptables-restore < /etc/iptables.flush
+sun::iptables-restore < /etc/iptables.flush

testing/tests/ikev2/host2host-transport-nat/pretest.dat

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+alice::iptables-restore < /etc/iptables.rules
+moon::iptables-restore < /etc/iptables.rules
+sun::iptables-restore < /etc/iptables.rules
+moon::iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -j MASQUERADE
+moon::iptables -A FORWARD -i eth1 -o eth0 -s 10.1.0.0/16  -j ACCEPT
+moon::iptables -A FORWARD -i eth0 -o eth1 -d 10.1.0.0/16  -j ACCEPT
+alice::ipsec start
+venus::ipsec start
+sun::ipsec start
+alice::expect-connection nat-t
+venus::expect-connection nat-t
+alice::ipsec up nat-t

testing/tests/ikev2/host2host-transport-nat/test.conf

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+#!/bin/bash
+#
+# This configuration file provides information on the
+# guest instances used for this test
+
+# All guest instances that are required for this test
+#
+VIRTHOSTS="alice moon winnetou sun"
+
+# Corresponding block diagram
+#
+DIAGRAM="a-m-w-s-b.png"
+
+# Guest instances on which tcpdump is to be started
+#
+TCPDUMPHOSTS="sun alice venus moon"
+
+# Guest instances on which IPsec is started
+# Used for IPsec logging purposes
+#
+IPSECHOSTS="alice venus sun"