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Diffstat (limited to 'docs/usecases/vpp_init_sswan_resp.md')
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diff --git a/docs/usecases/vpp_init_sswan_resp.md b/docs/usecases/vpp_init_sswan_resp.md new file mode 100644 index 00000000000..40da137cbd2 --- /dev/null +++ b/docs/usecases/vpp_init_sswan_resp.md @@ -0,0 +1,195 @@ +VPP as IKEv2 initiator and strongSwan as responder +================================================== + +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 | |strongSwan| +|initiator+----------------------+responder | ++---------+ +----------+ + 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=@sswan.vpn.example.com + leftsubnet=192.168.5.0/24 + +# remote: (gateway) + rightid=@roadwarrior.vpp + 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 roadwarrior.vpp +ikev2 profile set pr1 id remote fqdn sswan.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 + +ikev2 profile set pr1 responder host-gw 192.168.10.1 +ikev2 profile set pr1 ike-crypto-alg aes-gcm-16 256 ike-dh modp-2048 +ikev2 profile set pr1 esp-crypto-alg aes-gcm-16 256 + +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: + +``` +vpp# ikev2 initiate sa-init pr1 +``` + +``` +vpp# show ikev2 sa details + iip 192.168.10.2 ispi f717b0cbd17e27c3 rip 192.168.10.1 rspi e9b7af7fc9b13361 + encr:aes-gcm-16 prf:hmac-sha2-256 dh-group:modp-2048 + nonce i:eb0354613b268c6372061bbdaab13deca37c8a625b1f65c073d25df2ecfe672e + r:70e1248ac09943047064f6a2135fa2a424778ba03038ab9c4c2af8aba179ed84 + SK_d 96bd4feb59be2edf1930a12a3a5d22e30195ee9f56ea203c5fb6cba5dd2bb80f + SK_e i:00000000: 5b75b9d808c8467fd00a0923c06efee2a4eb1d033c57532e05f9316ed9c56fe9 + 00000020: c4db9114 + r:00000000: 95121b63372d20b83558dc3e209b9affef042816cf071c86a53543677b40c15b + 00000020: f169ab67 + SK_p i:fb40d1114c347ddc3228ba004d4759d58f9c1ae6f1746833f908d39444ef92b1 + r:aa049828240cb242e1d5aa625cd5914dc8f8e980a74de8e06883623d19384902 + identifier (i) id-type fqdn data roadwarrior.vpp + identifier (r) id-type fqdn data sswan.vpn.example.com + child sa 0:encr:aes-gcm-16 esn:yes + spi(i) 9dffd57a spi(r) c4e0ef53 + SK_e i:290c681694f130b33d511335dd257e78721635b7e8aa87930dd77bb1d6dd3f42 + r:0a09fa18cf1cf65c6324df02b46dcc998b84e5397cf911b63e0c096053946c2e + traffic selectors (i):0 type 7 protocol_id 0 addr 192.168.3.0 - 192.168.3.255 port 0 - 65535 + traffic selectors (r):0 type 7 protocol_id 0 addr 192.168.5.0 - 192.168.5.255 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=0.450 ms +64 bytes from 192.168.5.2: icmp_seq=2 ttl=63 time=0.630 ms +``` |