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diff --git a/docs/usecases/vpp_resp_sswan_init.md b/docs/usecases/vpp_resp_sswan_init.md new file mode 100644 index 00000000000..613a4b69cf6 --- /dev/null +++ b/docs/usecases/vpp_resp_sswan_init.md @@ -0,0 +1,197 @@ +VPP as IKEv2 responder and strongSwan as initiator +================================================== + + +Prerequisites +------------- + +To make the examples easier to configure ``docker`` it is required to pull strongSwan docker image. The networking is done using Linux' veth interfaces and namespaces. + +Setup +----- + +First a topology: + +``` +192.168.3.2 192.168.5.2 + + loopback + | + ++----+----+ 192.168.10.2 +-----+----+ +| VPP | |initiator | +|responder+----------------------+strongSwan| ++---------+ +----------+ + 192.168.10.1 +``` + +Create veth interfaces and namespaces and configure them: + +``` +sudo ip link add gw type veth peer name swanif +sudo ip link set dev gw up + +sudo ip netns add ns +sudo ip link add veth_priv type veth peer name priv +sudo ip link set dev priv up +sudo ip link set dev veth_priv up netns ns + +sudo ip netns exec ns \ + bash -c " + ip link set dev lo up + ip addr add 192.168.3.2/24 dev veth_priv + ip route add 192.168.5.0/24 via 192.168.3.1" +``` + + +Create directory with strongswan configs that will be mounted to the docker container +``` +mkdir /tmp/sswan +``` + +Create the ``ipsec.conf`` file in the ``/tmp/sswan`` directory with following content: +``` +config setup + strictcrlpolicy=no + +conn initiator + mobike=no + auto=add + type=tunnel + keyexchange=ikev2 + ike=aes256gcm16-prfsha256-modp2048! + esp=aes256gcm16-esn! + + # local: + leftauth=psk + leftid=@roadwarrior.vpn.example.com + leftsubnet=192.168.5.0/24 + + # remote: (vpp gateway) + rightid=@vpp.home + right=192.168.10.2 + rightauth=psk + rightsubnet=192.168.3.0/24 +``` + +``/tmp/sswan/ipsec.secrets`` +``` +: PSK 'Vpp123' +``` + +``/tmp/sswan/strongswan.conf`` +``` +charon { + load_modular = yes + plugins { + include strongswan.d/charon/*.conf + } + filelog { + /tmp/charon.log { + time_format = %b %e %T + ike_name = yes + append = no + default = 2 + flush_line = yes + } + } +} +include strongswan.d/*.conf +``` + +Start docker container with strongSwan: + +``` + docker run --name sswan -d --privileged --rm --net=none \ + -v /tmp/sswan:/conf -v /tmp/sswan:/etc/ipsec.d philplckthun/strongswan +``` + +Finish configuration of initiator's private network: + +``` +pid=$(docker inspect --format "{{.State.Pid}}" sswan) +sudo ip link set netns $pid dev swanif + +sudo nsenter -t $pid -n ip addr add 192.168.10.1/24 dev swanif +sudo nsenter -t $pid -n ip link set dev swanif up + +sudo nsenter -t $pid -n ip addr add 192.168.5.2/32 dev lo +sudo nsenter -t $pid -n ip link set dev lo up +``` + +Start VPP ... + +``` +sudo /usr/bin/vpp unix { \ + cli-listen /tmp/vpp.sock \ + gid $(id -g) } \ + api-segment { prefix vpp } \ + plugins { plugin dpdk_plugin.so { disable } } +``` + +... and configure it: + +``` +create host-interface name gw +set interface ip addr host-gw 192.168.10.2/24 +set interface state host-gw up + +create host-interface name priv +set interface ip addr host-priv 192.168.3.1/24 +set interface state host-priv up + +ikev2 profile add pr1 +ikev2 profile set pr1 auth shared-key-mic string Vpp123 +ikev2 profile set pr1 id local fqdn vpp.home +ikev2 profile set pr1 id remote fqdn roadwarrior.vpn.example.com + +ikev2 profile set pr1 traffic-selector local ip-range 192.168.3.0 - 192.168.3.255 port-range 0 - 65535 protocol 0 +ikev2 profile set pr1 traffic-selector remote ip-range 192.168.5.0 - 192.168.5.255 port-range 0 - 65535 protocol 0 + +create ipip tunnel src 192.168.10.2 dst 192.168.10.1 +ikev2 profile set pr1 tunnel ipip0 +ip route add 192.168.5.0/24 via 192.168.10.1 ipip0 +set interface unnumbered ipip0 use host-gw +``` + +Initiate the IKEv2 connection: + +``` +$ sudo docker exec sswan ipsec up initiator + +... +CHILD_SA initiator{1} established with SPIs c320c95f_i 213932c2_o and TS 192.168.5.0/24 === 192.168.3.0/24 +connection 'initiator' established successfully +``` + +``` +vpp# show ikev2 sa details + +iip 192.168.10.1 ispi 7849021d9f655f1b rip 192.168.10.2 rspi 5a9ca7469a035205 + encr:aes-gcm-16 prf:hmac-sha2-256 dh-group:modp-2048 + nonce i:692ce8fd8f1c1934f63bfa2b167c4de2cff25640dffe938cdfe01a5d7f6820e6 + r:3ed84a14ea8526063e5aa762312be225d33e866d7152b9ce23e50f0ededca9e3 + SK_d 9a9b896ed6c35c78134fcd6e966c04868b6ecacf6d5088b4b2aee8b05d30fdda + SK_e i:00000000: 1b1619788d8c812ca5916c07e635bda860f15293099f3bf43e8d88e52074b006 + 00000020: 72c8e3e3 + r:00000000: 89165ceb2cef6a6b3319f437386292d9ef2e96d8bdb21eeb0cb0d3b92733de03 + 00000020: bbc29c50 + SK_p i:fe35fca30985ee75e7c8bc0d7bc04db7a0e1655e997c0f5974c31458826b6fef + r:0dd318662a96a25fcdf4998d8c6e4180c67c03586cf91dab26ed43aeda250272 + identifier (i) id-type fqdn data roadwarrior.vpn.example.com + identifier (r) id-type fqdn data vpp.home + child sa 0:encr:aes-gcm-16 esn:yes + spi(i) c320c95f spi(r) 213932c2 + SK_e i:2a6c9eae9dbed202c0ae6ccc001621aba5bb0b01623d4de4d14fd27bd5185435 + r:15e2913d39f809040ca40a02efd27da298b6de05f67bd8f10210da5e6ae606fb + traffic selectors (i):0 type 7 protocol_id 0 addr 192.168.5.0 - 192.168.5.255 port 0 - 65535 + traffic selectors (r):0 type 7 protocol_id 0 addr 192.168.3.0 - 192.168.3.255 port 0 - 65535 + +``` + +Now we can generate some traffic between responder's and initiator's private networks and see it works. + +``` +$ sudo ip netns exec ns ping 192.168.5.2 +PING 192.168.5.2 (192.168.5.2) 56(84) bytes of data. +64 bytes from 192.168.5.2: icmp_seq=1 ttl=63 time=1.02 ms +64 bytes from 192.168.5.2: icmp_seq=2 ttl=63 time=0.599 ms +``` |