= OpenVPN SOP

OpenVPN is our server->server VPN solution. It is deployed in a
routeless manner and uses ansible managed keys for authentication. All
hosts should be given static IP's and a _hostname.vpn.fedoraproject.org_
DNS address.

== Contact Information

Owner::
  Fedora Infrastructure Team
Contact::
  #fedora-admin, sysadmin-main
Servers::
  bastion (vpn.fedoraproject.org)
Purpose::
  Provides vpn solution for our infrastructure.

== Add a new host

=== Create/sign the keys

See xref:howtos:generate_openvpn_keys.adoc[How to generate private key and certificate for OpenVPN client]

=== Create Static IP

Giving static IP's out in openvpn is mostly painless. Take a look at
other examples but each host gets a file and 2 IP's.:

....
git clone https://pagure.io/fedora-infra/ansible.git
vi ansible/roles/openvpn/server/files/ccd/$FQDN
....

The file format should look like this:

....
ifconfig-push 192.168.1.314 192.168.0.314
....

Basically the first IP is the IP that is contactable over the vpn and
should always take the format "192.168.1.x" and the PtPIP is the same ip
on a different network: "192.168.0.x"

Commit and install:

....
git add .
git commit -m "What have you done?"
git push
....

And then push that out to bastion:

....
sudo -i ansible-playbook $(pwd)/playbooks/groups/bastion.yml -t openvpn
....

=== Create DNS entry

After you have your static IP ready, just add the entry to DNS:

....
git clone /srv/git/dns && cd dns
vi master/168.192.in-addr.arpa
# pick out an ip that's unused
vi master/vpn.fedoraproject.org
git commit -m "What have you done?"
./do-domains
git commit -m "done build."
git push
....

And push that out to the name servers with:

....
sudo -i ansible ns\* -a "/usr/local/bin/update-dns"
....

=== Update resolv.conf on the client

To make sure traffic actually goes over the VPN, make sure the search
line in `/etc/resolv.conf` looks like:

....
search vpn.fedoraproject.org fedoraproject.org
....

for external hosts and:

....
search iad2.fedoraproject.org vpn.fedoraproject.org fedoraproject.org
....

for IAD2 hosts.

== Remove a host

....
# This is to ensure that the clone is not world-readable at any point.
RESTORE_UMASK=$(umask -p)
umask 0077
git clone /srv/git/ansible-private
$RESTORE_UMASK
cd ansible-private/files/vpn
....

Next, use the `easyrsa` command to revoke the certificate:

....
/usr/share/easy-rsa/3.0/easyrsa revoke $FQDN
git add .
git commit -a
git push
....

== TODO

Deploy an additional VPN server outside of IAD2. OpenVPN does support
failover automatically so if configured properly, when the primary VPN
server goes down all hosts should connect to the next host in the list.