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The ungleich VPN infrastructure » History » Version 15

Nico Schottelius, 02/16/2019 12:33 PM

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h1. The ungleich VPN infrastructure
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{{toc}}
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h2. Status
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This document is *IN PRODUCTION*.
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h2. Security of IPv6 vs. NAT
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A quick reminder: whether you are using private RFC1918 IPv4 addresses or IPv6 addresses, if you don't want people to access your network, you need to configure a firewall.
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h2. Wireguard VPN on vpn-2a0ae5c1.ungleich.ch
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* Server: vpn-2a0ae5c1.ungleich.ch
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* Port: 51820
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* Requires a public key
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* Client network: 2a0a:e5c1:100::/40
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* Client network size: /48
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h3. How to add a new customer connection
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* Get the public key of the customer
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* Edit dot-cdist/type/__ungleich_wireguard/manifest and add the new network definition at the end of the file
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* Let the customer know their network
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h3. Sample clustomer client configuration
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* "Install wireguard":https://www.wireguard.com/install/
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* Create your private key: @umask 077; wg genkey > privkey@
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* Get your public key: @wg pubkey < privkey@
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** You need to send this pubkey to ungleich
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* You will get your network definition after we have received your public key
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* Create /etc/wireguard/wg0.conf
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<pre>
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[Interface]
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PrivateKey = YOURKEYHERE
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Address = YOURIPv6IPADDRESSHERE/48
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ListenPort = 51280
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[Peer]
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PublicKey = hi60lGP+xEUQ+kVnqA7PlJAO1SVqTS1W36g0LhFP0xQ=
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Endpoint = vpn-2a0ae5c1.ungleich.ch:51820
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AllowedIPs = ::/0
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</pre>
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h3. How to setup the VPN (the easy way)
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Once you have created the configuration, you can simply call
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<pre>
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wg-quick up wg0
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</pre>
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And to stop the VPN, you can use
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<pre>
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wg-quick down wg0
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</pre>
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h3. How to setup the VPN (the manual way)
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Commands for setting it up
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<pre>
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MY_NET=2a0a:e5c1:XXXX::1/48
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ip link add dev wg0 type wireguard
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# Replace with your range
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ip addr add $MY_NET dev wg0
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# Add routing
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ip route add 2a0a:e5c1::/32 dev wg0
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ip route add ::/0 via 2a0a:e5c1:100::1
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# Configure the interface
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wg setconf wg0 /etc/wireguard/wg0.conf
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# Bring it up
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ip link set wg0 up
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</pre>
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h3. About usable IPv6 addresses
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We route a /48 to everyone. Even though technically possible, you should not use the *zero address* of your network, as it is reserved for reaching all routers.
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I.e. if your IPv6 network was 2a0a:e5c1:101::/48, don't use 2a0a:e5c1:101::. The reason for this is that all routers (devices that have ip forwarding enabled) for this network
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are supposed to answer on this address.
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In other words, in your wg0.conf use:
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<pre>
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[Interface]
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...
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Address = 2a0a:e5c1:101::42/48
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</pre>
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Do *NOT* use:
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<pre>
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[Interface]
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...
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# Don't use this
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Address = 2a0a:e5c1:101::/48
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</pre>
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h3. How to debug
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* wg show # Show configuration
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* ping 2a0a:e5c1:100::1 # Try to ping the gateway
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h3. Sample server configuration
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This is just for reference - as a client you don't need this configuration
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/etc/wireguard/wg0.conf:
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<pre>
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[Interface]
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ListenPort = 51820
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PrivateKey = SERVERKEYHERE
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# Nico, 2019-01-23
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[Peer]
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PublicKey = kL1S/Ipq6NkFf1MAsNRou4b9VoUsnnb4ZxgiBrH0zA8=
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AllowedIPs = 2a0a:e5c1:101::/48
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# Customer networks below
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# ...
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</pre>
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Sample server rc.local:
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<pre>
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ip link add dev wg0 type wireguard
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ip addr add 2a0a:e5c1:100::1/40 dev wg0
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wg setconf wg0 /etc/wireguard/wg0.conf
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ip link set wg0 up
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</pre>
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h2. OpenVPN on openvpn.ungleich.ch
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* Server: openvpn.ungleich.ch
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* Port: 1195
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* Requires a certificate
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* Address range: 2a0a:e5c0:3::/48
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** Client networks are /64