added ikev2/nat-two-rw-mark scenario
This commit is contained in:
Andreas Steffen
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The roadwarriors <b>alice</b> and <b>venus</b> sitting behind the NAT router <b>moon</b> set up
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tunnels to gateway <b>sun</b>. UDP encapsulation is used to traverse the NAT router.
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Since both roadwarriors possess the same 10.1.0.0/25 subnet, gateway <b>sun</b> uses Source NAT
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after ESP decryption to map these subnets to 10.3.0.10 and 10.3.0.20, respectively.
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<p/>
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In order to differentiate between the tunnels to <b>alice</b> and <b>venus</b>, respectively,
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<b>XFRM marks</b> are defined for both the inbound and outbound IPsec SAs and policies using
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the <b>mark=</b> ipsec.conf parameter. <b>iptables -t mangle</b> rules are then used in the PREROUTING
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chain to mark the traffic to and from <b>alice</b> and <b>venus</b>, respectively.
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<p/>
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<b>leftfirewall=yes</b> automatically inserts iptables-based firewall rules that let pass
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the tunneled traffic. In order to test the tunnel, the NAT-ed hosts <b>alice</b> and <b>venus</b>
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ping the client <b>bob</b> behind the gateway <b>sun</b>.
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alice::ipsec statusall::nat-t.*INSTALLED::YES
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venus::ipsec statusall::nat-t.*INSTALLED::YES
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sun::ipsec statusall::alice.*ESTABLISHED.*[email protected]::YES
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sun::ipsec statusall::venus.*ESTABLISHED.*venus.strongswan.org::YES
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sun::ipsec statusall::alice.*10.2.0.0/16 === 10.1.0.0/25::YES
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sun::ipsec statusall::venus.*10.2.0.0/16 === 10.1.0.0/25::YES
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alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_seq=1::YES
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venus::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_seq=1::YES
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moon::tcpdump::IP moon.strongswan.org.4510.* > sun.strongswan.org.ipsec-nat-t: UDP::YES
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moon::tcpdump::IP moon.strongswan.org.4520.* > sun.strongswan.org.ipsec-nat-t: UDP::YES
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moon::tcpdump::IP sun.strongswan.org.ipsec-nat-t > moon.strongswan.org.4510.*: UDP::YES
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moon::tcpdump::IP sun.strongswan.org.ipsec-nat-t > moon.strongswan.org.4520.*: UDP::YES
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bob::tcpdump::10.3.0.10 > bob.strongswan.org: ICMP echo request::YES
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bob::tcpdump::10.3.0.20 > bob.strongswan.org: ICMP echo request::YES
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bob::tcpdump::bob.strongswan.org > 10.3.0.10: ICMP echo reply::YES
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bob::tcpdump::bob.strongswan.org > 10.3.0.20: ICMP echo reply::YES
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# /etc/ipsec.conf - strongSwan IPsec configuration file
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config setup
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crlcheckinterval=180
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strictcrlpolicy=no
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plutostart=no
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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 nat-t
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left=%defaultroute
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leftsubnet=10.1.0.0/25
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leftcert=aliceCert.pem
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[email protected]
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leftfirewall=yes
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lefthostaccess=yes
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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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# /etc/strongswan.conf - strongSwan configuration file
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charon {
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load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random x509 hmac xcbc stroke kernel-netlink socket-default updown
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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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crlcheckinterval=180
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strictcrlpolicy=no
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plutostart=no
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charondebug="knl 2"
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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 alice
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[email protected]
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mark=10/0xffffffff
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also=sun
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auto=add
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conn venus
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[email protected]
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mark=20 #0xffffffff is used by default
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also=sun
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auto=add
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conn sun
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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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leftfirewall=yes
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right=%any
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rightsubnet=0.0.0.0/0
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# /etc/strongswan.conf - strongSwan configuration file
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charon {
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load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random x509 hmac xcbc stroke kernel-netlink socket-default updown
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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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crlcheckinterval=180
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strictcrlpolicy=no
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plutostart=no
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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 nat-t
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left=%defaultroute
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leftsubnet=10.1.0.0/25
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leftcert=venusCert.pem
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[email protected]
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leftfirewall=yes
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lefthostaccess=yes
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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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# /etc/strongswan.conf - strongSwan configuration file
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charon {
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load = curl aes des sha1 sha2 md5 pem pkcs1 gmp random x509 hmac xcbc stroke kernel-netlink socket-default updown
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}
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sun::ipsec stop
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alice::ipsec stop
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venus::ipsec stop
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alice::/etc/init.d/iptables stop 2> /dev/null
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venus::/etc/init.d/iptables stop 2> /dev/null
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sun::/etc/init.d/iptables stop 2> /dev/null
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moon::iptables -t nat -F
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moon::conntrack -F
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sun::iptables -t mangle -F
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sun::iptables -t nat -F
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sun::conntrack -F
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alice::/etc/init.d/iptables start 2> /dev/null
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venus::/etc/init.d/iptables start 2> /dev/null
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sun::/etc/init.d/iptables start 2> /dev/null
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moon::echo 1 > /proc/sys/net/ipv4/ip_forward
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moon::iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -p tcp -j SNAT --to PH_IP_MOON
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moon::iptables -t nat -A POSTROUTING -o eth0 -s PH_IP_ALICE -p udp --sport 500 -j SNAT --to PH_IP_MOON:510
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moon::iptables -t nat -A POSTROUTING -o eth0 -s PH_IP_VENUS -p udp --sport 500 -j SNAT --to PH_IP_MOON:520
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moon::iptables -t nat -A POSTROUTING -o eth0 -s PH_IP_ALICE -p udp --sport 4500 -j SNAT --to PH_IP_MOON:4510
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moon::iptables -t nat -A POSTROUTING -o eth0 -s PH_IP_VENUS -p udp --sport 4500 -j SNAT --to PH_IP_MOON:4520
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sun::echo 1 > /proc/sys/net/ipv4/ip_forward
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sun::iptables -t mangle -A PREROUTING -s PH_IP_MOON -p udp --sport 4510 -j MARK --set-mark 10
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sun::iptables -t mangle -A PREROUTING -s PH_IP_MOON -p udp --sport 4520 -j MARK --set-mark 20
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sun::iptables -t nat -A POSTROUTING -o eth1 -m mark --mark 10 -j SNAT --to 10.3.0.10
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sun::iptables -t nat -A POSTROUTING -o eth1 -m mark --mark 20 -j SNAT --to 10.3.0.20
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sun::iptables -t mangle -A PREROUTING -d 10.3.0.10 -j MARK --set-mark 10
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sun::iptables -t mangle -A PREROUTING -d 10.3.0.20 -j MARK --set-mark 20
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alice::ipsec start
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venus::ipsec start
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sun::ipsec start
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alice::sleep 2
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alice::ipsec up nat-t
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venus::sleep 2
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venus::ipsec up nat-t
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venus::sleep 2
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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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# UML instances used for this test
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# All UML instances that are required for this test
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#
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UMLHOSTS="alice venus moon winnetou sun bob"
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# Corresponding block diagram
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#
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DIAGRAM="a-v-m-w-s-b.png"
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# UML instances on which tcpdump is to be started
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#
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TCPDUMPHOSTS="moon bob"
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# UML 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 venus sun"
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