testing: Add swanctl/net2net-childless scenario
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Tobias Brunner
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A connection between the subnets behind the gateways <b>moon</b> and <b>sun</b>
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is set up using childless initiation of IKEv2 SAs (RFC 6023).
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<p/>
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The IKE_SA is established without CHILD_SA during IKE_AUTH. Instead, the
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CHILD_SA is created right afterwards with a CREATE_CHILD_SA exchange, allowing
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the use of a separate DH exchange for the first CHILD_SA, which is not possible
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if it is created during IKE_AUTH.
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<p/>
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The authentication is based on <b>X.509 certificates</b>. Upon the successful
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establishment of the IPsec tunnel, the updown script automatically
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inserts iptables-based firewall rules that let pass the tunneled traffic.
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In order to test both tunnel and firewall, client <b>alice</b> behind gateway
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<b>moon</b> pings client <b>bob</b> located behind gateway <b>sun</b>.
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moon::swanctl --list-sas --raw 2> /dev/null::gw-gw.*version=2 state=ESTABLISHED local-host=192.168.0.1 local-port=500 local-id=moon.strongswan.org remote-host=192.168.0.2 remote-port=500 remote-id=sun.strongswan.org initiator=yes.*encr-alg=AES_CBC encr-keysize=128 integ-alg=HMAC_SHA2_256_128 prf-alg=PRF_HMAC_SHA2_256 dh-group=CURVE_25519.*child-sas.*net-net.*state=INSTALLED mode=TUNNEL.*ESP.*encr-alg=AES_GCM_16 encr-keysize=128 dh-group=CURVE_25519.*local-ts=\[10.1.0.0/16] remote-ts=\[10.2.0.0/16]::YES
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sun:: swanctl --list-sas --raw 2> /dev/null::gw-gw.*version=2 state=ESTABLISHED local-host=192.168.0.2 local-port=500 local-id=sun.strongswan.org remote-host=192.168.0.1 remote-port=500 remote-id=moon.strongswan.org.*encr-alg=AES_CBC encr-keysize=128 integ-alg=HMAC_SHA2_256_128 prf-alg=PRF_HMAC_SHA2_256 dh-group=CURVE_25519.*child-sas.*net-net.*state=INSTALLED mode=TUNNEL.*ESP.*encr-alg=AES_GCM_16 encr-keysize=128 dh-group=CURVE_25519.*local-ts=\[10.2.0.0/16] remote-ts=\[10.1.0.0/16]::YES
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moon::cat /var/log/daemon.log::generating CREATE_CHILD_SA request 2.*KE::YES
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moon::cat /var/log/daemon.log::parsed CREATE_CHILD_SA response 2.*KE::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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sun::tcpdump::IP moon.strongswan.org > sun.strongswan.org: ESP::YES
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sun::tcpdump::IP sun.strongswan.org > moon.strongswan.org: ESP::YES
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# /etc/strongswan.conf - strongSwan configuration file
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swanctl {
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load = pem pkcs1 x509 revocation constraints pubkey openssl random
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}
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charon-systemd {
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load = random nonce aes sha1 sha2 hmac pem pkcs1 x509 revocation curve25519 gmp curl kernel-netlink socket-default updown vici
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}
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connections {
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gw-gw {
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local_addrs = 192.168.0.1
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remote_addrs = 192.168.0.2
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childless = force
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local {
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auth = pubkey
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certs = moonCert.pem
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id = moon.strongswan.org
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}
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remote {
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auth = pubkey
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id = sun.strongswan.org
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}
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children {
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net-net {
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local_ts = 10.1.0.0/16
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remote_ts = 10.2.0.0/16
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updown = /usr/local/libexec/ipsec/_updown iptables
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rekey_time = 5400
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rekey_bytes = 500000000
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rekey_packets = 1000000
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esp_proposals = aes128gcm128-x25519
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}
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}
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version = 2
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mobike = no
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reauth_time = 10800
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proposals = aes128-sha256-x25519
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}
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}
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# /etc/strongswan.conf - strongSwan configuration file
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swanctl {
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load = pem pkcs1 x509 revocation constraints pubkey openssl random
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}
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charon-systemd {
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load = random nonce aes sha1 sha2 hmac pem pkcs1 x509 revocation curve25519 gmp curl kernel-netlink socket-default updown vici
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}
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connections {
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gw-gw {
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local_addrs = 192.168.0.2
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remote_addrs = 192.168.0.1
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local {
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auth = pubkey
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certs = sunCert.pem
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id = sun.strongswan.org
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}
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remote {
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auth = pubkey
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id = moon.strongswan.org
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}
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children {
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net-net {
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local_ts = 10.2.0.0/16
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remote_ts = 10.1.0.0/16
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updown = /usr/local/libexec/ipsec/_updown iptables
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rekey_time = 5400
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rekey_bytes = 500000000
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rekey_packets = 1000000
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esp_proposals = aes128gcm128-x25519
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}
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}
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version = 2
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mobike = no
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reauth_time = 10800
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proposals = aes128-sha256-x25519
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}
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}
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moon::swanctl --terminate --ike gw-gw 2> /dev/null
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moon::systemctl stop strongswan-swanctl
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sun::systemctl stop strongswan-swanctl
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moon::iptables-restore < /etc/iptables.flush
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sun::iptables-restore < /etc/iptables.flush
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moon::iptables-restore < /etc/iptables.rules
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sun::iptables-restore < /etc/iptables.rules
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moon::systemctl start strongswan-swanctl
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sun::systemctl start strongswan-swanctl
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moon::expect-connection gw-gw
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sun::expect-connection gw-gw
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moon::swanctl --initiate --child net-net 2> /dev/null
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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="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="moon sun"
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# charon controlled by swanctl
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#
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SWANCTL=1
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