testing: Migrate ikev2/host2host-transport-nat scenario to vici

This also restores the test as it was before the referenced commit so it again, as written in the description, demonstrates that venus is unable to ping sun without IPsec tunnel. Fixes: f27fb58ae0 ("testing: Update description and test evaluation of host2host-transport-nat")
2021-06-21 12:03:36 +02:00
parent 2b5c743952
commit 6d8890767c
19 changed files with 133 additions and 73 deletions
@@ -0,0 +1,14 @@
+An IPsec <b>transport-mode</b> connection between the natted host <b>alice</b> and gateway <b>sun</b>
+is successfully set up. The updown script automatically inserts iptables-based firewall
+rules that let pass the protected traffic. In order to test the host-to-host tunnel
+<b>alice</b> pings <b>sun</b>.<br/>
+<b>Note:</b> This scenario also demonstrates two problems with transport-mode and NAT traversal:
+<ol>
+<li>The client <b>venus</b> behind the same NAT as client <b>alice</b> is not able to ping <b>sun</b>
+(even with ICMP explicitly allowed there) because the request arrives unencrypted and thus gets
+dropped when the IPsec policies are consulted (increases the <em>XfrmInTmplMismatch</em> counter
+in <em>/proc/net/xfrm_stat</em>).</li>
+<li>A similar issue arises when <b>venus</b> also establishes an IPsec <b>transport-mode</b> connection to
+<b>sun</b>. Due to the conflicting IPsec policies <b>sun</b> will use the newer SA from
+<b>venus</b> to send traffic to the common transport mode address.</li>
+</ol>
@@ -0,0 +1,16 @@
+alice::swanctl --list-sas --raw 2> /dev/null::host-host.*version=2 state=ESTABLISHED local-host=PH_IP_ALICE local-port=4500 [email protected] remote-host=PH_IP_SUN remote-port=4500 remote-id=sun.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.*host-host.*state=INSTALLED mode=TRANSPORT.*ESP encap=yes.*encr-alg=AES_GCM_16 encr-keysize=128.*local-ts=\[PH_IP_ALICE/32] remote-ts=\[PH_IP_SUN/32]::YES
+sun::  swanctl --list-sas --raw 2> /dev/null::host-host.*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 [email protected].*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.*host-host.*state=INSTALLED mode=TRANSPORT.*ESP encap=yes.*encr-alg=AES_GCM_16 encr-keysize=128.*local-ts=\[PH_IP_SUN/32] remote-ts=\[PH_IP_MOON/32]::YES
+alice::ping -c 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_.eq=1::YES
+# this won't work due to the IPsec policy on sun for the NAT's public IP
+venus::ping -c 1 -W 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_.eq=1::NO
+venus::expect-connection host-host
+venus::swanctl --initiate --child host-host 2> /dev/null
+venus::swanctl --list-sas --raw 2> /dev/null::host-host.*version=2 state=ESTABLISHED local-host=PH_IP_VENUS local-port=4500 local-id=venus.strongswan.org remote-host=PH_IP_SUN remote-port=4500 remote-id=sun.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.*host-host.*state=INSTALLED mode=TRANSPORT.*ESP encap=yes.*encr-alg=AES_GCM_16 encr-keysize=128.*local-ts=\[PH_IP_VENUS/32] remote-ts=\[PH_IP_SUN/32]::YES
+sun::  swanctl --list-sas --raw 2> /dev/null::host-host.*version=2 state=ESTABLISHED local-host=PH_IP_SUN local-port=4500 local-id=sun.strongswan.org remote-host=PH_IP_MOON remote-port=.* remote-id=venus.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.*host-host.*state=INSTALLED mode=TRANSPORT.*ESP encap=yes.*encr-alg=AES_GCM_16 encr-keysize=128.*local-ts=\[PH_IP_SUN/32] remote-ts=\[PH_IP_MOON/32]::YES
+# now traffic goes via the newer SA between sun and venus
+alice::ping -c 1 -W 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_.eq=1::NO
+venus::ping -c 1 -W 1 PH_IP_SUN::64 bytes from PH_IP_SUN: icmp_.eq=1::YES
+sun::tcpdump::IP moon.strongswan.org.* > sun.strongswan.org.*: UDP::YES
+sun::tcpdump::IP sun.strongswan.org.* > moon.strongswan.org.*: UDP::YES
+sun::tcpdump::IP moon.strongswan.org > sun.strongswan.org: ICMP echo request::YES
+sun::tcpdump::IP sun.strongswan.org > moon.strongswan.org: ICMP echo reply::NO
@@ -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 hmac pem pkcs1 x509 revocation curve25519 gmp curl kernel-netlink socket-default updown vici
+}
@@ -0,0 +1,26 @@
+connections {
+
+   host-host {
+      remote_addrs = 192.168.0.2
+
+      local {
+         auth = pubkey
+         certs = aliceCert.pem
+         id = [email protected]
+      }
+      remote {
+         auth = pubkey
+         id = sun.strongswan.org
+      }
+      children {
+         host-host {
+            updown = /usr/local/libexec/ipsec/_updown iptables
+            esp_proposals = aes128gcm128-x25519
+            mode = transport
+         }
+      }
+      version = 2
+      mobike = no
+      proposals = aes128-sha256-x25519
+   }
+}
@@ -0,0 +1,28 @@
+*filter
+
+# default policy is DROP
+-P INPUT DROP
+-P OUTPUT DROP
+-P FORWARD DROP
+
+# allow IKE
+-A INPUT  -i eth0 -p udp --dport 500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 500 -j ACCEPT
+
+# allow MobIKE
+-A INPUT  -i eth0 -p udp --dport 4500 -j ACCEPT
+-A OUTPUT -o eth0 -p udp --sport 4500 -j ACCEPT
+
+# allow ssh
+-A INPUT  -p tcp --dport 22 -j ACCEPT
+-A OUTPUT -p tcp --sport 22 -j ACCEPT
+
+# allow crl fetch from winnetou
+-A INPUT  -i eth0 -p tcp --sport 80 -s PH_IP_WINNETOU -j ACCEPT
+-A OUTPUT -o eth0 -p tcp --dport 80 -d PH_IP_WINNETOU -j ACCEPT
+
+# allow ICMP
+-A INPUT  -i eth0 -p icmp -j ACCEPT
+-A OUTPUT -o eth0 -p icmp -j ACCEPT
+
+COMMIT
@@ -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 hmac pem pkcs1 x509 revocation curve25519 gmp curl kernel-netlink socket-default updown vici
+}
@@ -0,0 +1,23 @@
+connections {
+
+   host-host {
+      local {
+         auth = pubkey
+         certs = sunCert.pem
+         id = sun.strongswan.org
+      }
+      remote {
+         auth = pubkey
+      }
+      children {
+         host-host {
+            updown = /usr/local/libexec/ipsec/_updown iptables
+            esp_proposals = aes128gcm128-x25519
+            mode = transport
+         }
+      }
+      version = 2
+      mobike = no
+      proposals = aes128-sha256-x25519
+   }
+}
@@ -0,0 +1,18 @@
+# /etc/ipsec.conf - strongSwan IPsec configuration file
+
+config setup
+
+conn %default
+	ikelifetime=60m
+	keylife=20m
+	rekeymargin=3m
+	keyingtries=1
+
+conn nat-t
+	leftcert=venusCert.pem
+	[email protected]
+	leftfirewall=yes
+	right=192.168.0.2
+	[email protected]
+	type=transport
+	auto=add
@@ -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 hmac pem pkcs1 x509 revocation curve25519 gmp curl kernel-netlink socket-default updown vici
+}
@@ -0,0 +1,26 @@
+connections {
+
+   host-host {
+      remote_addrs = 192.168.0.2
+
+      local {
+         auth = pubkey
+         certs = venusCert.pem
+         id = venus.strongswan.org
+      }
+      remote {
+         auth = pubkey
+         id = sun.strongswan.org
+      }
+      children {
+         host-host {
+            updown = /usr/local/libexec/ipsec/_updown iptables
+            esp_proposals = aes128gcm128-x25519
+            mode = transport
+         }
+      }
+      version = 2
+      mobike = no
+      proposals = aes128-sha256-x25519
+   }
+}
@@ -0,0 +1,6 @@
+alice::systemctl stop strongswan
+venus::systemctl stop strongswan
+sun::systemctl stop strongswan
+alice::iptables-restore < /etc/iptables.flush
+moon::iptables-restore < /etc/iptables.flush
+sun::iptables-restore < /etc/iptables.flush
@@ -0,0 +1,12 @@
+alice::iptables-restore < /etc/iptables.rules
+moon::iptables-restore < /etc/iptables.rules
+sun::iptables-restore < /etc/iptables.rules
+moon::iptables -t nat -A POSTROUTING -o eth0 -s 10.1.0.0/16 -j MASQUERADE
+moon::iptables -A FORWARD -i eth1 -o eth0 -s 10.1.0.0/16  -j ACCEPT
+moon::iptables -A FORWARD -i eth0 -o eth1 -d 10.1.0.0/16  -j ACCEPT
+sun::systemctl start strongswan
+alice::systemctl start strongswan
+venus::systemctl start strongswan
+sun::expect-connection host-host
+alice::expect-connection host-host
+alice::swanctl --initiate --child host-host 2> /dev/null
@@ -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"
+
+# Corresponding block diagram
+#
+DIAGRAM="a-m-w-s-b.png"
+
+# Guest instances on which tcpdump is to be started
+#
+TCPDUMPHOSTS="sun alice venus moon"
+
+# Guest instances on which IPsec is started
+# Used for IPsec logging purposes
+#
+IPSECHOSTS="alice venus sun"
+
+# charon controlled by swanctl
+#
+SWANCTL=1