nixos/user/services/ssh-office.nix

{ pkgs, config, ... }:
let
  sshotp = pkgs.writeScriptBin "sshotp"
    ''
      #!/usr/bin/env expect
      set stty_init -echo
      set timeout 300
      set totp [lindex $argv 0];
      puts "Our TOTP $totp"
      spawn ssh -D 20000 dresden.uio.no
      expect {
        -re {.*(Verification_Code):} { 
          send -- "$totp\r"    
          exp_continue
        }
        -re {.*dresden.*} {
          wait
        }
      } 
    '';
  ssh-dresden = pkgs.writeShellApplication {
    name = "ssh-dresden";
    runtimeInputs = [ pkgs.rbw pkgs.expect ];
    text = ''
      #!/usr/bin/env bash
      totp=$(rbw get -f "TOTP" rlogin)
      expect -f ${sshotp}/bin/sshotp "$totp"
    '';

  };
in
{
  systemd.user.services.ssh-office = {
    Unit = {
      Description = "Office ssh session";
    };
    Service = {
      Type = "simple";
      ExecStart = "${ssh-dresden}/bin/ssh-dresden";
      Restart = "never";
    };
  };
}