testing: Add ikev2/mobike-virtual-ip-nat scenario
This tests moving from a public IP behind a NAT and back (with proper changes of the UDP encapsulation).
This commit is contained in:
Tobias Brunner
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The roadwarrior <b>alice</b> is sitting behind the NAT router <b>moon</b> but
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at the outset of the scenariou is also directly connected to the 192.168.0.0/24 network
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via an additional <b>eth1</b> interface. <b>alice</b> builds up a tunnel to gateway <b>sun</b>
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in order to reach <b>bob</b> in the subnet behind. When the <b>eth1</b> interface
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goes away, <b>alice</b> switches to <b>eth0</b> and signals the IP address change
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via a MOBIKE ADDRESS_UPDATE notification to peer <b>sun</b>. Later the interface
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comes back up again and because the best path is preferred (charon.prefer_best_path)
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there is another switch to the directly connected path. <b>alice</b> sets
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a virtual IP of 10.3.0.3, so that the IPsec policies don't have to be changed.
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alice::ipsec status 2> /dev/null::mobike.*ESTABLISHED.*192.168.0.50.*PH_IP_SUN::YES
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sun:: ipsec status 2> /dev/null::mobike.*ESTABLISHED.*PH_IP_SUN.*192.168.0.50::YES
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alice::ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP SPIs::YES
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sun:: ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP SPIs::YES
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alice::ipsec statusall 2> /dev/null::10.3.0.3/32 === 10.2.0.0/16::YES
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sun:: ipsec statusall 2> /dev/null::10.2.0.0/16 === 10.3.0.3/32::YES
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alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
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alice::ifdown eth1::No output expected::NO
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alice::sleep 1::No output expected::NO
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alice::ipsec status 2> /dev/null::mobike.*ESTABLISHED.*PH_IP_ALICE.*PH_IP_SUN::YES
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sun:: ipsec status 2> /dev/null::mobike.*ESTABLISHED.*PH_IP_SUN.*PH_IP_MOON::YES
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alice::ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP in UDP SPIs::YES
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sun:: ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP in UDP SPIs::YES
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alice::ipsec statusall 2> /dev/null::10.3.0.3/32 === 10.2.0.0/16::YES
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sun:: ipsec statusall 2> /dev/null::10.2.0.0/16 === 10.3.0.3/32::YES
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alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
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alice::ifup eth1::No output expected::NO
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alice::sleep 1::No output expected::NO
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alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
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alice::ipsec status 2> /dev/null::mobike.*ESTABLISHED.*192.168.0.50.*PH_IP_SUN::YES
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sun:: ipsec status 2> /dev/null::mobike.*ESTABLISHED.*PH_IP_SUN.*192.168.0.50::YES
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alice::ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP SPIs::YES
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sun:: ipsec status 2> /dev/null::mobike.*INSTALLED.*ESP SPIs::YES
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alice::ipsec statusall 2> /dev/null::10.3.0.3/32 === 10.2.0.0/16::YES
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sun:: ipsec statusall 2> /dev/null::10.2.0.0/16 === 10.3.0.3/32::YES
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sun::tcpdump::alice1.strongswan.org.*sun.strongswan.org: ESP.*seq=0x1::YES
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sun::tcpdump::sun.strongswan.org.*alice1.strongswan.org: ESP.*seq=0x1::YES
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moon::tcpdump::moon.strongswan.org.*sun.strongswan.org.*: ESP.*seq=0x2::YES
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moon::tcpdump::sun.strongswan.org.*moon.strongswan.org.*: ESP.*seq=0x2::YES
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bob::tcpdump::10.3.0.3.*bob.strongswan.org.*ICMP echo request::3
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bob::tcpdump::bob.strongswan.org.*10.3.0.3.*ICMP echo reply::3
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# /etc/ipsec.conf - strongSwan IPsec configuration file
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config setup
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conn %default
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ikelifetime=60m
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keylife=20m
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rekeymargin=3m
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keyingtries=1
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keyexchange=ikev2
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conn mobike
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leftsourceip=%config
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leftcert=aliceCert.pem
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[email protected]
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right=PH_IP_SUN
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[email protected]
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rightsubnet=10.2.0.0/16
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auto=add
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*filter
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# default policy is DROP
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-P INPUT DROP
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-P OUTPUT DROP
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-P FORWARD DROP
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# allow traffic on lo as ifup/ifdown call bind's rndc which accesses TCP 953
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-A OUTPUT -o lo -j ACCEPT
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-A INPUT -i lo -j ACCEPT
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# allow IPsec tunnel traffic
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-A INPUT -m policy --dir in --pol ipsec --proto esp -j ACCEPT
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-A OUTPUT -m policy --dir out --pol ipsec --proto esp -j ACCEPT
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# allow ESP
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-A INPUT -i eth0 -p 50 -j ACCEPT
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-A INPUT -i eth1 -p 50 -j ACCEPT
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-A OUTPUT -o eth0 -p 50 -j ACCEPT
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-A OUTPUT -o eth1 -p 50 -j ACCEPT
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# allow IKE
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-A INPUT -i eth0 -p udp --sport 500 --dport 500 -j ACCEPT
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-A INPUT -i eth1 -p udp --sport 500 --dport 500 -j ACCEPT
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-A OUTPUT -o eth0 -p udp --dport 500 --sport 500 -j ACCEPT
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-A OUTPUT -o eth1 -p udp --dport 500 --sport 500 -j ACCEPT
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# allow MobIKE
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-A INPUT -i eth0 -p udp --sport 4500 --dport 4500 -j ACCEPT
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-A INPUT -i eth1 -p udp --sport 4500 --dport 4500 -j ACCEPT
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-A OUTPUT -o eth0 -p udp --dport 4500 --sport 4500 -j ACCEPT
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-A OUTPUT -o eth1 -p udp --dport 4500 --sport 4500 -j ACCEPT
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# allow ssh
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A OUTPUT -p tcp --sport 22 -j ACCEPT
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# allow crl fetch from winnetou
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-A INPUT -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
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-A OUTPUT -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT
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COMMIT
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# /etc/strongswan.conf - strongSwan configuration file
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charon {
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load = random nonce aes sha1 sha2 pem pkcs1 curve25519 gmp x509 curl revocation hmac stroke kernel-netlink socket-default
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prefer_best_path = yes
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syslog {
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daemon {
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knl = 2
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}
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}
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}
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# /etc/ipsec.conf - strongSwan IPsec configuration file
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config setup
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conn %default
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ikelifetime=60m
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keylife=20m
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rekeymargin=3m
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keyingtries=1
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keyexchange=ikev2
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conn mobike
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left=PH_IP_SUN
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leftcert=sunCert.pem
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[email protected]
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leftsubnet=10.2.0.0/16
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right=%any
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rightsourceip=10.3.0.3
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[email protected]
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auto=add
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*filter
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# default policy is DROP
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-P INPUT DROP
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-P OUTPUT DROP
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-P FORWARD DROP
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# allow IPsec tunnel traffic
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-A FORWARD -m policy --dir in --pol ipsec --proto esp -j ACCEPT
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-A FORWARD -m policy --dir out --pol ipsec --proto esp -j ACCEPT
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# allow ESP
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-A INPUT -i eth0 -p 50 -j ACCEPT
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-A OUTPUT -o eth0 -p 50 -j ACCEPT
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# allow IKE
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-A INPUT -i eth0 -p udp --dport 500 -j ACCEPT
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-A OUTPUT -o eth0 -p udp --sport 500 -j ACCEPT
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# allow MobIKE
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-A INPUT -i eth0 -p udp --dport 4500 -j ACCEPT
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-A OUTPUT -o eth0 -p udp --sport 4500 -j ACCEPT
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# allow ssh
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-A INPUT -p tcp --dport 22 -j ACCEPT
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-A OUTPUT -p tcp --sport 22 -j ACCEPT
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# allow crl fetch from winnetou
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-A INPUT -i eth0 -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
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-A OUTPUT -o eth0 -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT
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COMMIT
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# /etc/strongswan.conf - strongSwan configuration file
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charon {
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load = random nonce aes sha1 sha2 pem pkcs1 curve25519 gmp x509 curl revocation hmac stroke kernel-netlink socket-default
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syslog {
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daemon {
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knl = 2
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}
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}
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}
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alice::ipsec stop
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sun::ipsec stop
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alice::ifdown eth1
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alice::iptables-restore < /etc/iptables.flush
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sun::iptables-restore < /etc/iptables.flush
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moon::iptables -t nat -F
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alice::ifup eth1
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alice::iptables-restore < /etc/iptables.rules
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sun::iptables-restore < /etc/iptables.rules
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moon::iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -p udp -j SNAT --to-source PH_IP_MOON:1024-1100
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moon::iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -p tcp -j SNAT --to-source PH_IP_MOON:2000-2100
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alice::ipsec start
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sun::ipsec start
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alice::expect-connection mobike
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sun::expect-connection mobike
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alice::ipsec up mobike
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#!/bin/bash
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#
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# This configuration file provides information on the
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# guest instances used for this test
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# All guest instances that are required for this test
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#
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VIRTHOSTS="alice moon winnetou sun bob"
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# Corresponding block diagram
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#
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DIAGRAM="a-m-w-s-b.png"
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# Guest instances on which tcpdump is to be started
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#
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TCPDUMPHOSTS="bob moon sun"
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# Guest instances on which IPsec is started
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# Used for IPsec logging purposes
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#
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IPSECHOSTS="alice sun"
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