[Bug 1825378] Re: systemd-networkd doesn't set wireguard peer endpoint

[jrb0001]

disco-proposed fixed it for me as well:
- Clean disco installation.
- Create .netdev file.
- reboot
--> Endpoint is not set.
- Update systemd from disco-proposed.
- reboot
--> Endpoint is set.

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https://bugs.launchpad.net/bugs/1825378

Title:
  systemd-networkd doesn't set wireguard peer endpoint

Status in systemd package in Ubuntu:
  Fix Committed
Status in systemd source package in Cosmic:
  Invalid
Status in systemd source package in Disco:
  Fix Committed
Status in systemd source package in Eoan:
  Fix Committed

Bug description:
  [impact]

  systemd does not set endpoints for wireguard interfaces correctly.
  This makes wireguard unusable.

  [test case]

  install a disco or eoan system and set up a wireguard interface:

  $ sudo add-apt-repository ppa:wireguard/wireguard
  $ sudo apt install wireguard
  ...(this does a lot of stuff)...

  create a file as below; There is no need to setup remote server to
  reproduce this issue, but PublicKey/PrivateKey should be valid one
  (used instructions from https://www.linode.com/docs/networking/vpn
  /set-up-wireguard-vpn-on-ubuntu/#configure-wireguard-server):

  $ cat /etc/systemd/network/wg0.netdev
  [NetDev]
  Name=wg0
  Kind=wireguard

  [WireGuard]
  PrivateKey=uMuCbguKYdKanRYMbDSriIdgxGxJR57Us1zEy8wRc1M=
  ListenPort=51820

  [WireGuardPeer]
  PublicKey=ZRyl+kvb6o2/6Da5YLum6GnSrzDj3J002+2kmK5CnS4=
  AllowedIPs=10.0.0.0/8
  Endpoint=192.168.1.1:51820

  $ sudo systemctl restart systemd-networkd
  $ sudo wg show wg0

  interface: wg0
    public key: BnvFgvPiVb5xURfzZ5liV1P77qeGeJDIX3C1iNquA2k=
    private key: (hidden)
    listening port: 51820

  peer: ZRyl+kvb6o2/6Da5YLum6GnSrzDj3J002+2kmK5CnS4=
    allowed ips: 10.0.0.0/8

  the last command should print remote endpoint address, e.g.:

  peer: ZRyl+kvb6o2/6Da5YLum6GnSrzDj3J002+2kmK5CnS4=
    endpoint: 192.168.1.1:51820
    allowed ips: 10.0.0.0/8

  [regression potential]

  any changes to systemd contain the potential for serious regressions.
  However, this is cherry picked directly from upstream, with the
  releases requiring patching (disco and eoan) being at exactly the same
  version and very close to upstream already.  Additionally, while this
  does add 2 new functions (from upstream commit
  https://github.com/systemd/systemd/pull/11580/commits/abd48ec87f2ac5dd571a99dcb4db88c4affdffc8),
  they are only used - and code is only changed in - wireguard.c, so any
  regressions should be limited to wireguard interfaces (unless systemd
  crashes completely).

  [other info]

  this bug is not present in cosmic and earlier, and is already fixed in
  upstream systemd, so this is needed only for disco and eoan.

  original description:

  ---

  systemd/disco 240 shipped with Ubuntu 19.04 beta does not set
  endpoints for [WireguradPeer] properly.

  This regression was introduced in v241 and merged into v240.
  systemd 241 doesn't set wireguard peer endpoint
  https://github.com/systemd/systemd/issues/11579

  Revert of the regression was landed on v240 stable branch
  https://github.com/systemd/systemd-stable/pull/39

  1)2) confirmed with,

  systemd/disco 240-6ubuntu5 amd64

  3)
  put a netdev file /etc/systemd/network/wg0.netdev

  ---
  [NetDev]
  Name=wg0
  Kind=wireguard

  [WireGuard]
  PrivateKey=**************
  ListenPort=51820

  [WireGuardPeer]
  PublicKey=*************
  AllowedIPs=10.0.0.0/8
  Endpoint=192.168.1.1:51820
  ----

  and run
  ---
  # systemctl restart systemd-networkd
  # wg show wg0

  interface: wg0
    public key: *****************
    private key: (hidden)
    listening port: 51820

  peer: *****************
    allowed ips: 10.0.0.0/8
  ----

  4)
  the last command should print remote endpoint address.
  ---
  # wg show wg0

  interface: wg0
    public key: *****************
    private key: (hidden)
    listening port: 51820

  peer: *****************
    endpoint: 192.168.1.1:51820
    allowed ips: 10.0.0.0/8
  ----

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