{ ... }:
{
  programs.ssh = {
    enable = true;
    forwardAgent = true;
    serverAliveInterval = 15;
    serverAliveCountMax = 3;
    controlMaster = "auto";
    controlPersist = "1s";
    matchBlocks = {
      "git.*".user = "git";
      "xenia.me.uk" = { user = "git"; port = 2222; };
    };
  };
}