testing: Add scenario that uses IKE-specific interface IDs
This commit is contained in:
Tobias Brunner
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One connection with two CHILD_SAs between the hosts and subnet behind the
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gateways <b>moon</b> and <b>sun</b>, respectively, are set up using XFRM
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interfaces.
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<p/>
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The gateways use <b>route-based forwarding</b> with <b>XFRM interfaces</b>, with
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firewall rules to allow traffic to pass. Both peers use connection-defined
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interface IDs so all CHILD_SAs share the same XFRM interface. The IKE daemon
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does not install routes for CHILD_SAs with outbound interface ID, so routes for
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the target subnets are installed statically or via updown events.
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<p/>
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Both gateways use separate interfaces for in- and outbound traffic (which is
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completely optional and mainly for testing purposes, a single interface will
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usually be enough). Gateway <b>moon</b> creates them before initiating the
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connection, while gateway <b>sun</b> dynamically creates the interfaces via
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ike-updown event using the passed unique generated interface IDs.
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<p/>
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Clients <b>alice</b> and <b>venus</b> behind gateway <b>moon</b> ping client
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<b>bob</b> located behind gateway <b>sun</b>.
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moon::swanctl --list-sas --ike-id 1 --raw 2> /dev/null::gw.*version=2 state=ESTABLISHED local-host=PH_IP_MOON local-port=4500 local-id=moon.strongswan.org remote-host=PH_IP_SUN remote-port=4500 remote-id=sun.strongswan.org.*child-sas.*net.*reqid=1 state=INSTALLED mode=TUNNEL.*ESP.*local-ts=\[10.1.0.10/32] remote-ts=\[10.2.0.0/16].*local-ts=\[10.1.0.20/32] remote-ts=\[10.2.0.0/16]::YES
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sun::swanctl --list-sas --ike-id 1 --raw 2> /dev/null::gw.*version=2 state=ESTABLISHED local-host=PH_IP_SUN local-port=4500 local-id=sun.strongswan.org remote-host=PH_IP_MOON remote-port=4500 remote-id=moon.strongswan.org.*child-sas.*net.*reqid=1 state=INSTALLED mode=TUNNEL.*ESP.*local-ts=\[10.2.0.0/16] remote-ts=\[10.1.0.10/32].*local-ts=\[10.2.0.0/16] remote-ts=\[10.1.0.20/32]::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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venus::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 pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-netlink socket-default updown
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}
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+33
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connections {
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gw-gw {
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local_addrs = PH_IP_MOON
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remote_addrs = PH_IP_SUN
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if_id_out = 1337
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if_id_in = 42
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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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alice-net {
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local_ts = 10.1.0.10/32
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remote_ts = 0.0.0.0/0
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esp_proposals = aes128gcm128-x25519
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}
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venus-net : connections.gw-gw.children.alice-net {
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local_ts = 10.1.0.20/32
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}
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}
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version = 2
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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 pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-netlink socket-default
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start-scripts {
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updown = /usr/bin/python /etc/updown.py
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}
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}
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+30
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connections {
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gw-gw {
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local_addrs = PH_IP_SUN
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remote_addrs = PH_IP_MOON
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if_id_in = %unique-dir
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if_id_out = %unique-dir
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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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esp_proposals = aes128gcm128-x25519
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}
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}
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version = 2
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proposals = aes128-sha256-x25519
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}
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}
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#!/usr/bin/env python
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import vici
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import daemon
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import logging
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from logging.handlers import SysLogHandler
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import subprocess
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logger = logging.getLogger('updownLogger')
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handler = SysLogHandler(address='/dev/log', facility=SysLogHandler.LOG_DAEMON)
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handler.setFormatter(logging.Formatter('charon-updown: %(message)s'))
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logger.addHandler(handler)
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logger.setLevel(logging.INFO)
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def handle_interfaces(ike_sa, up):
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if_id_in = int(ike_sa['if-id-in'], 16)
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if_id_out = int(ike_sa['if-id-out'], 16)
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ifname_in = "xfrm-{}-in".format(if_id_in)
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ifname_out = "xfrm-{}-out".format(if_id_out)
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if up:
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logger.info("add XFRM interfaces %s and %s", ifname_in, ifname_out)
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subprocess.call(["/usr/local/libexec/ipsec/xfrmi", "-n", ifname_out,
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"-i", str(if_id_out), "-d", "eth0"])
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subprocess.call(["/usr/local/libexec/ipsec/xfrmi", "-n", ifname_in,
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"-i", str(if_id_in), "-d", "eth0"])
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subprocess.call(["ip", "link", "set", ifname_out, "up"])
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subprocess.call(["ip", "link", "set", ifname_in, "up"])
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subprocess.call(["iptables", "-A", "FORWARD", "-o", ifname_out,
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"-j", "ACCEPT"])
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subprocess.call(["iptables", "-A", "FORWARD", "-i", ifname_in,
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"-j", "ACCEPT"])
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else:
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logger.info("delete XFRM interfaces %s and %s", ifname_in, ifname_out)
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subprocess.call(["iptables", "-D", "FORWARD", "-o", ifname_out,
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"-j", "ACCEPT"])
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subprocess.call(["iptables", "-D", "FORWARD", "-i", ifname_in,
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"-j", "ACCEPT"])
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subprocess.call(["ip", "link", "del", ifname_out])
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subprocess.call(["ip", "link", "del", ifname_in])
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def install_routes(ike_sa):
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if_id_out = int(ike_sa['if-id-out'], 16)
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ifname_out = "xfrm-{}-out".format(if_id_out)
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child_sa = next(ike_sa["child-sas"].itervalues())
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for ts in child_sa['remote-ts']:
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logger.info("add route to %s via %s", ts, ifname_out)
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subprocess.call(["ip", "route", "add", ts, "dev", ifname_out])
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# daemonize and run parallel to the IKE daemon
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with daemon.DaemonContext():
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logger.debug("starting Python updown listener")
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try:
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session = vici.Session()
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ver = session.version()
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logger.info("connected to {daemon} {version} ({sysname}, {release}, "
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"{machine})".format(**ver))
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except:
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logger.error("failed to get status via vici")
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sys.exit(1)
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try:
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for label, event in session.listen(["ike-updown", "child-updown"]):
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logger.debug("received event: %s %s", label, repr(event))
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name = next((x for x in iter(event) if x != "up"))
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up = event.get("up", "") == "yes"
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ike_sa = event[name]
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if label == "ike-updown":
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handle_interfaces(ike_sa, up)
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elif label == "child-updown" and up:
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install_routes(ike_sa)
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except IOError:
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logger.error("daemon disconnected")
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except:
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logger.error("exception while listening for events " +
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repr(sys.exc_info()[1]))
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@@ -0,0 +1,10 @@
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moon::swanctl --terminate --ike gw-gw
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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::ip -s link show xfrm-moon-out
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moon::ip -s link show xfrm-moon-in
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moon::ip link del xfrm-moon-out
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moon::ip link del xfrm-moon-in
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sun::rm /etc/updown.py
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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::/usr/local/libexec/ipsec/xfrmi -n xfrm-moon-out -d eth0 -i 1337
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moon::/usr/local/libexec/ipsec/xfrmi -n xfrm-moon-in -d eth0 -i 42
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moon::ip link set xfrm-moon-out up
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moon::ip link set xfrm-moon-in up
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moon::ip route add 10.2.0.0/16 dev xfrm-moon-out
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moon::iptables -A FORWARD -o xfrm-moon-out -j ACCEPT
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moon::iptables -A FORWARD -i xfrm-moon-in -j ACCEPT
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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 alice-net
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moon::swanctl --initiate --child venus-net
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@@ -0,0 +1,25 @@
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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 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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# 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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