testing: Add scenarios that use XFRM interfaces

The network namespace scenario requires a kernel patch in 4.19 and 4.20 kernels (the fix is included in 5.0 kernels).
2019-04-04 09:31:38 +02:00
parent 801a5d3133
commit 760d7c9b4f
31 changed files with 547 additions and 0 deletions
@@ -0,0 +1,22 @@
+This scenario demonstrates a property of <b>XFRM interfaces</b> that allows
+moving them into network namespaces while retaining access to IPsec SAs and
+policies in the original namespace. This enables an IKE daemon in one namespace
+to provide IPsec tunnels for processes in other namespaces without having to
+give them access to the keys and IKE credentials.
+<p/>
+The gateways use <b>route-based forwarding</b> with <b>XFRM interfaces</b>, with
+firewall rules to allow traffic to pass. The IPsec traffic selector used is
+0.0.0.0/0, however, specific routing is achieved with routes on the XFRM
+interfaces.  The IKE daemon does not install routes for CHILD_SAs with outbound
+interface ID, so static routes are installed for the target subnets.
+<p/>
+The XFRM interface on gateway <b>moon</b> is moved into a new network namespace
+from which a ping is sent to client <b>bob</b>. It is then moved back out and
+<b>alice</b> sends another ping to <b>bob</b> to test if that works too.
+<p/>
+Gateway <b>sun</b> dynamically creates the XFRM interface via updown script
+using the passed unique generated interface ID.
+<p/>
+Note that the dropped packet seen on the <b>XFRM interface</b> on <b>moon</b>
+is an IPv6 Router Solicitation (NDP) sent from that namespace, which doesn't
+match the IPsec policy.
@@ -0,0 +1,18 @@
+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=\[0.0.0.0/0] remote-ts=\[0.0.0.0/0]::YES
+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=\[0.0.0.0/0] remote-ts=\[0.0.0.0/0]::YES
+alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
+moon::ip netns add xfrmi-test::.*::NO
+moon::ip link set xfrm-moon netns xfrmi-test::.*::NO
+moon::ip netns exec xfrmi-test ip addr add 10.1.0.42/32 dev xfrm-moon::.*::NO
+moon::ip netns exec xfrmi-test ip link set dev xfrm-moon up::.*::NO
+moon::ip netns exec xfrmi-test ip route add 10.2.0.0/16 dev xfrm-moon src 10.1.0.42::.*::NO
+moon::ip netns exec xfrmi-test ip xfrm state::.*::NO
+moon::ip netns exec xfrmi-test ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
+alice::ping -c 1 -W 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::NO
+moon::ip netns exec xfrmi-test ip link set xfrm-moon netns 1::.*::NO
+moon::ip netns del xfrmi-test::.*::NO
+moon::ip link set dev xfrm-moon up::.*::NO
+moon::ip route add 10.2.0.0/16 dev xfrm-moon::.*::NO
+alice::ping -c 1 PH_IP_BOB::64 bytes from PH_IP_BOB: icmp_.eq=1::YES
+sun::tcpdump::IP moon.strongswan.org > sun.strongswan.org: ESP::YES
+sun::tcpdump::IP sun.strongswan.org > moon.strongswan.org: ESP::YES
@@ -0,0 +1,9 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+swanctl {
+  load = pem pkcs1 x509 revocation constraints pubkey openssl random
+}
+
+charon-systemd {
+  load = random nonce aes sha1 sha2 pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-netlink socket-default updown
+}
@@ -0,0 +1,30 @@
+connections {
+
+   gw-gw {
+      local_addrs  = PH_IP_MOON
+      remote_addrs = PH_IP_SUN
+
+      local {
+         auth = pubkey
+         certs = moonCert.pem
+         id = moon.strongswan.org
+      }
+      remote {
+         auth = pubkey
+         id = sun.strongswan.org
+      }
+      children {
+         net-net {
+            local_ts  = 0.0.0.0/0
+            remote_ts = 0.0.0.0/0
+
+            if_id_out = 42
+            if_id_in = 42
+
+            esp_proposals = aes128gcm128-x25519
+         }
+      }
+      version = 2
+      proposals = aes128-sha256-x25519
+   }
+}
@@ -0,0 +1,9 @@
+# /etc/strongswan.conf - strongSwan configuration file
+
+swanctl {
+  load = pem pkcs1 x509 revocation constraints pubkey openssl random
+}
+
+charon-systemd {
+  load = random nonce aes sha1 sha2 pem pkcs1 curve25519 gmp x509 curl revocation hmac vici kernel-netlink socket-default updown
+}
@@ -0,0 +1,32 @@
+connections {
+
+   gw-gw {
+      local_addrs  = PH_IP_SUN
+      remote_addrs = PH_IP_MOON
+
+      local {
+         auth = pubkey
+         certs = sunCert.pem
+         id = sun.strongswan.org
+      }
+      remote {
+         auth = pubkey
+         id = moon.strongswan.org
+      }
+      children {
+         net-net {
+            local_ts  = 0.0.0.0/0
+            remote_ts = 0.0.0.0/0
+
+            if_id_out = %unique
+            if_id_in = %unique
+
+            updown = /etc/updown
+
+            esp_proposals = aes128gcm128-x25519
+         }
+      }
+      version = 2
+      proposals = aes128-sha256-x25519
+   }
+}
@@ -0,0 +1,18 @@
+#!/bin/bash
+
+IF_NAME="xfrmi-${PLUTO_IF_ID_IN}"
+
+case "${PLUTO_VERB}" in
+    up-client)
+        /usr/local/libexec/ipsec/xfrmi -n "${IF_NAME}" -i "${PLUTO_IF_ID_IN}" -d eth0
+        ip link set "${IF_NAME}" up
+        ip route add 10.1.0.0/16 dev "${IF_NAME}"
+        iptables -A FORWARD -i "${IF_NAME}" -j ACCEPT
+        iptables -A FORWARD -o "${IF_NAME}" -j ACCEPT
+        ;;
+    down-client)
+        iptables -D FORWARD -i "${IF_NAME}" -j ACCEPT
+        iptables -D FORWARD -o "${IF_NAME}" -j ACCEPT
+        ip link del "${IF_NAME}"
+        ;;
+esac
@@ -0,0 +1,8 @@
+moon::swanctl --terminate --ike gw-gw
+moon::systemctl stop strongswan-swanctl
+sun::systemctl stop strongswan-swanctl
+moon::iptables-restore < /etc/iptables.flush
+sun::iptables-restore < /etc/iptables.flush
+moon::ip -s link show xfrm-moon
+moon::ip link del xfrm-moon
+sun::rm /etc/updown
@@ -0,0 +1,12 @@
+moon::iptables-restore < /etc/iptables.rules
+sun::iptables-restore < /etc/iptables.rules
+moon::/usr/local/libexec/ipsec/xfrmi -n xfrm-moon -i 42 -d eth0
+moon::ip link set xfrm-moon up
+moon::ip route add 10.2.0.0/16 dev xfrm-moon
+moon::iptables -A FORWARD -i xfrm-moon -j ACCEPT
+moon::iptables -A FORWARD -o xfrm-moon -j ACCEPT
+moon::systemctl start strongswan-swanctl
+sun::systemctl start strongswan-swanctl
+moon::expect-connection gw-gw
+sun::expect-connection gw-gw
+moon::swanctl --initiate --child net-net
@@ -0,0 +1,25 @@
+#!/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 bob"
+
+# Corresponding block diagram
+#
+DIAGRAM="a-m-w-s-b.png"
+
+# Guest instances on which tcpdump is to be started
+#
+TCPDUMPHOSTS="sun"
+
+# Guest instances on which IPsec is started
+# Used for IPsec logging purposes
+#
+IPSECHOSTS="moon sun"
+
+# charon controlled by swanctl
+#
+SWANCTL=1