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<p class="MsoNormal">* Libreswan 3.15 ipsec (libreswan-3.15-5.el7_1.x86_64)<o:p></o:p></p>
<p class="MsoNormal">* Openstack Icehouse<o:p></o:p></p>
<p class="MsoNormal">* RHEL 7.1 boxes used as routers<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Followed this document (with modifications) https://libreswan.org/wiki/Subnet_to_subnet_VPN_with_PSK<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am attempting to create libreswan ipsec tunnels between tenants in an Openstack Icehouse cloud. I have created a shared subnet (10.255.255.0/24) that the RHEL boxes attach to in a multi-homed fashion. Each box has two interfaces. net.ipv4.ip_forward
is enabled (1) on each box.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Router in tenant A Router in tenant B<o:p></o:p></p>
<p class="MsoNormal"> ------------------------ ------------------------<o:p></o:p></p>
<p class="MsoNormal"> eth0 eth1 <=================> eth1 eth0<o:p></o:p></p>
<p class="MsoNormal"> 10.0.1.1 10.255.255.10 10.255.255.20 10.0.2.1<o:p></o:p></p>
<p class="MsoNormal"> ------------------------ ------------------------<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Routing<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> Tenant A: 10.0.1.0/24<o:p></o:p></p>
<p class="MsoNormal"> * Subnet hosts use gateway: 10.0.1.1<o:p></o:p></p>
<p class="MsoNormal"> Tenant B: 10.0.2.0/24<o:p></o:p></p>
<p class="MsoNormal"> * Subnet hosts use gateway: 10.0.2.1<o:p></o:p></p>
<p class="MsoNormal"> Shared segment: 10.255.255.0/24<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> 10.0.2.0/24 via 10.255.255.20 <o:p></o:p></p>
<p class="MsoNormal"> 10.0.1.0/24 via 10.255.255.10<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I've setup the VM ports to allow tenant A's network to be announced on Tenant B's eth0 interface, and vice-versa, by setting the port's allowed_address_pairs to the opposite network's range (this is an Openstack-ism). I can connect (ping,ssh)
across the shared network to arbitrary hosts on the other end. This all works without libreswan in the middle.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I add libreswan, and things break.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Libreswan config router tenant A<o:p></o:p></p>
<p class="MsoNormal">--------------------------------<o:p></o:p></p>
<p class="MsoNormal"> config setup<o:p></o:p></p>
<p class="MsoNormal"> protostack=netkey<o:p></o:p></p>
<p class="MsoNormal"> plutodebug=all<o:p></o:p></p>
<p class="MsoNormal"> plutorestartoncrash=yes<o:p></o:p></p>
<p class="MsoNormal"> dumpdir=/var/run/pluto<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> conn base<o:p></o:p></p>
<p class="MsoNormal"> authby=rsasig<o:p></o:p></p>
<p class="MsoNormal"> left=10.255.255.10<o:p></o:p></p>
<p class="MsoNormal"> leftsourceip=10.0.1.1<o:p></o:p></p>
<p class="MsoNormal"> leftsubnet=10.0.1.0/24<o:p></o:p></p>
<p class="MsoNormal"> leftrsasigkey=<redacted><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> tenant_a<o:p></o:p></p>
<p class="MsoNormal"> also=base<o:p></o:p></p>
<p class="MsoNormal"> right=10.255.255.10<o:p></o:p></p>
<p class="MsoNormal"> rightsubnet=10.0.2.0/24<o:p></o:p></p>
<p class="MsoNormal"> rightrsasigkey=<redacted><o:p></o:p></p>
<p class="MsoNormal"> auto=start<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Libreswan config router tenant B<o:p></o:p></p>
<p class="MsoNormal">--------------------------------<o:p></o:p></p>
<p class="MsoNormal"> config setup<o:p></o:p></p>
<p class="MsoNormal"> protostack=netkey<o:p></o:p></p>
<p class="MsoNormal"> plutodebug=all<o:p></o:p></p>
<p class="MsoNormal"> plutorestartoncrash=yes<o:p></o:p></p>
<p class="MsoNormal"> dumpdir=/var/run/pluto<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> conn base<o:p></o:p></p>
<p class="MsoNormal"> authby=rsasig<o:p></o:p></p>
<p class="MsoNormal"> left=10.255.255.20<o:p></o:p></p>
<p class="MsoNormal"> leftsourceip=10.0.2.1<o:p></o:p></p>
<p class="MsoNormal"> leftsubnet=10.0.2.0/24<o:p></o:p></p>
<p class="MsoNormal"> leftrsasigkey=<redacted><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> tenant_b<o:p></o:p></p>
<p class="MsoNormal"> also=base<o:p></o:p></p>
<p class="MsoNormal"> right=10.255.255.20<o:p></o:p></p>
<p class="MsoNormal"> rightsubnet=10.0.1.0/24<o:p></o:p></p>
<p class="MsoNormal"> rightrsasigkey=<redacted><o:p></o:p></p>
<p class="MsoNormal"> auto=start<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Running this config on each end has the tunnel coming up without any errors. When the tunnel comes up, libreswan adds a new route with a higher priority than the initial static route:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> 10.0.2.0/24 dev eth1 scope link src 10.0.1.1<o:p></o:p></p>
<p class="MsoNormal"> 10.0.2.0/24 via 10.255.255.20 dev eth1 proto static metric 100<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">and the same on the remote end:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> 10.0.1.0/24 dev eth1 scope link src 10.0.2.1<o:p></o:p></p>
<p class="MsoNormal"> 10.0.1.0/24 via 10.255.255.10 dev eth1 proto static metric 100<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I can ping the remote router's eth0 interface IP address but not any hosts in the remote subnet. This is true from either direction.
<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">With this config, i can reach the remote end:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> traceroute to 10.0.2.1 (10.0.2.1), 64 hops max, 52 byte packets<o:p></o:p></p>
<p class="MsoNormal"> 1 172.31.228.1 (172.31.228.1) 29.907 ms 29.742 ms 29.888 ms<o:p></o:p></p>
<p class="MsoNormal"> 2 10.0.1.1 (10.0.1.1) 30.338 ms 29.795 ms 29.985 ms<o:p></o:p></p>
<p class="MsoNormal"> 3 10.0.2.1 (10.0.2.1) 29.645 ms 30.893 ms 30.823 ms<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">But cannot route past 10.0.2.1. I get a 'Network unreachable' error:<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"> 1 172.31.228.1 (172.31.228.1) 29.907 ms 29.742 ms 29.888 ms<o:p></o:p></p>
<p class="MsoNormal"> 2 10.0.1.1 (10.0.1.1) 30.338 ms 29.795 ms 29.985 ms<o:p></o:p></p>
<p class="MsoNormal"> 3 10.0.1.1 (10.0.1.1) 3035.382 ms !H 30.893 ms 30.823 ms</p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Any idea what is going on here?<o:p></o:p></p>
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