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This is a succinct instruction on creating a WireGuard VPN host on OpenBSD. We will create a subnet (192.168.99.0/24) on a tunnel interface (tun0) in which the host and all the WireGuard clients will have an IP-adress. The host will route all client traffic over it's primary network interface using masquerade NAT.
Install the necessary WireGuard packages. This instruction is written for OpenBSD 6.7 and uses the userland WireGuard implementation. OpenBSD 6.8 will feature a kernel implementation.
pkg_add wireguard-go wireguard-tools
Enable IP-forwarding.
echo 'net.inet.ip.forwarding=1' >> /etc/sysctl.conf sysctl -p
Create /etc/hostname.tun0 and configure addressing and routing
inet 192.168.99.1 255.255.255.0 192.168.99.255 description "WireGuard" !/sbin/route add -inet 192.168.99.0/24 192.168.99.1
Restart the network
sh /etc/netstart && sh /etc/netstart
Edit the pf configuration in /etc/pf.conf
Skip pf processing on the tunnel interface. This line likely already has the loopback interface lo0. It should look look this:
set skip on {lo tun0}
Masquerade all traffic from the WireGuard subnet behind the egress interface's address:
pass out on egress inet from (tun0:network) nat-to (egress:0)
Reload the pf configuration to activate the changes:
pfctl -f /etc/pf.conf
Create the WireGuard config directory and set permissions
mkdir /etc/wireguard chmod 0700 /etc/wireguard
Create the private and public keys
cd /etc/wireguard umask 077 wg genkey > /etc/wireguard/privkey wg pubkey < /etc/wireguard/privkey > /etc/wireguard/publickey
Make sure to create keys on your clients too! You can use the following commands:
wg genkey > /etc/wireguard/privkey wg pubkey < /etc/wireguard/privkey > /etc/wireguard/publickey wg genpsk > /etc/wireguard/psk
Create the WireGuard configuration file: /etc/wireguard/tun0.conf. This will make WireGuard listen on UDP port 51820 and have on peer which is allowed IP-address 192.168.99.2 on the WireGuard subnet.
[Interface] PrivateKey = <paste content of /etc/wireguard/privkey> ListenPort = 51820 [Peer] PublicKey = <paste your peer's public key here> PresharedKey = <paste your peer's PSK here> AllowedIPs = 192.168.99.2/32
Set the WireGuard userland program to start on boot and tell it to use tun0 as tunnel adapter.
rcctl enable wireguard_go rcctl set wireguard_go flags tun0 rcctl start wireguard_go
Load the wireguard configuration file and make sure it loads on reboot
wg setconf tun0 /etc/wireguard/tun0.conf echo '/usr/local/bin/wg setconf tun0 /etc/wireguard/tun0.conf' >> /etc/rc.local
Connect a client and run the command "wg" to see the status of your WireGuard server and connected clients.
interface: tun0 public key: (hidden) private key: (hidden) listening port: 51820 peer: (peer's public key) preshared key: (hidden) endpoint: (peer's ip-address):(peer's source port) allowed ips: 192.168.99.2/32 latest handshake: 2 days, 2 hours, 26 minutes, 13 seconds ago transfer: 307.50 KiB received, 876.06 KiB sent