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OpenVPN on FreeBSD 11.1 on DigitalOcean

It’s nearly impossible to work from Russia without VPN that I decided to set up OpenVPN on $5 droplet on DigitalOcean. There’s a good article about setting it up on FreeBSD 10.3 but it’s a bit outdated and doesn’t have important information about routing. Why FreeBSD? Because it’s always been in my ❤️. Just take a look at this beauty:

root@vpn:~ # top

last pid:   915;  load averages:  1.26,  0.51,  0.20
up 0+00:01:10  17:13:10 21 processes:  1 running, 20 sleeping
CPU:  0.4% user,  0.0% nice,  0.4% system,  0.4% interrupt, 98.8% idle
Mem: 18M Active, 34M Inact, 48M Wired, 14M Buf, 866M Free
Swap: 2048M Total, 2048M Free

But it’s not the only thing to fall in love with BSD I think I’ll come with a post about it later. Let’s get going.

Install and copy configs:

Let’s first change shell to sh as FreeBSD comes with csh by default:

root@vpn:~ # sh
pkg update && pkg install openvpn
mkdir /usr/local/etc/openvpn
cp /usr/local/share/examples/openvpn/sample-config-files/server.conf \
   /usr/local/etc/openvpn/openvpn.conf
cp -r /usr/local/share/easy-rsa /usr/local/etc/openvpn/easy-rsa
cd /usr/local/etc/openvpn/easy-rsa

Set these variables in the file and save:

# vim vars
set_var EASYRSA_REQ_COUNTRY     "<COUNTRY>"
set_var EASYRSA_REQ_PROVINCE    "<PROVINCE>"
set_var EASYRSA_REQ_CITY        "<CITY>"
set_var EASYRSA_REQ_ORG         "<ORGANIZATION>"
set_var EASYRSA_REQ_EMAIL       "<EMAIL>"
set_var EASYRSA_REQ_OU          "<ORGANIZATIONAL UNIT>"
set_var EASYRSA_KEY_SIZE        2048
set_var EASYRSA_CA_EXPIRE       3650
set_var EASYRSA_CERT_EXPIRE     3650

Generate server keys:

./easyrsa.real init-pki
./easyrsa.real build-ca
./easyrsa.real build-server-full openvpn-server nopass
./easyrsa.real gen-dh
openvpn --genkey --secret ta.key

Generate client keys:

Set CLIENT_NAME to any name you’d like to associate your OpenVPN client with:

CLIENT_NAME="<client-name>"
./easyrsa.real build-client-full $CLIENT_NAME nopass

Copy server keys:

mkdir /usr/local/etc/openvpn/keys
cp pki/dh.pem \
   pki/ca.crt \
   pki/issued/openvpn-server.crt \
   pki/private/openvpn-server.key \
   ta.key \
   /usr/local/etc/openvpn/keys

Configure client:

Change <server-ip> in the middle of the ovpn file to your server IP/Domain.

cd /usr/local/etc/openvpn
touch $CLIENT_NAME.ovpn
cat > $CLIENT_NAME.ovpn
client
nobind
dev tun
remote-cert-tls server

remote <server-ip> 1194 udp

key-direction 1

redirect-gateway def1

Type Ctrl-D here and then type the rest:

printf "<key>\n" >> $CLIENT_NAME.ovpn
cat easy-rsa/pki/private/$CLIENT_NAME.key >> $CLIENT_NAME.ovpn
printf "</key>\n" >> $CLIENT_NAME.ovpn
printf "<cert>\n" >> $CLIENT_NAME.ovpn
sed -n '/^-----BEGIN/,/^-----END/p' easy-rsa/pki/issued/$CLIENT_NAME.crt >> $CLIENT_NAME.ovpn
printf "</cert>\n" >> $CLIENT_NAME.ovpn
printf "<ca>\n" >> $CLIENT_NAME.ovpn
cat easy-rsa/pki/ca.crt >> $CLIENT_NAME.ovpn
printf "</ca>\n" >> $CLIENT_NAME.ovpn
printf "<tls-auth>\n" >> $CLIENT_NAME.ovpn
cat easy-rsa/ta.key >> $CLIENT_NAME.ovpn
printf "</tls-auth>\n" >> $CLIENT_NAME.ovpn

Configure server:

touch openvpn.conf
cat > openvpn.conf
server 192.168.255.0 255.255.255.0

verb 3

key /usr/local/etc/openvpn/keys/openvpn-server.key  # This file should be kept secret
ca /usr/local/etc/openvpn/keys/ca.crt
cert /usr/local/etc/openvpn/keys/openvpn-server.crt
dh /usr/local/etc/openvpn/keys/dh.pem
tls-auth /usr/local/etc/openvpn/keys/ta.key 0 # This file is secret

key-direction 0
keepalive 10 60

persist-key
persist-tun

proto udp
port 1194
dev tun

status openvpn-status.log

user nobody
group nobody

explicit-exit-notify 1
remote-cert-tls client

route 192.168.254.0 255.255.255.0

push "dhcp-option DNS 8.8.8.8"
push "dhcp-option DNS 8.8.4.4"

Type Ctrl-D here and again type the rest:

sysrc openvpn_enable="YES"
sysrc openvpn_if="tun"
sysrc gateway_enable="YES"
sysrc firewall_enable="YES"
sysrc firewall_type="OPEN"
sysrc natd_enable="YES"
sysrc natd_interface="vtnet0"
sysrc natd_flags=""
service openvpn start
reboot

After your droplet reboots you can download $CLIENT_NAME.ovpn to your client machine and start browsing internet securely:

scp root@<server-ip>:/usr/local/etc/openvpn/<client-name>.ovpn ./
sudo openvpn <client-name>.ovpn
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