Merge remote-tracking branch 'prism/master'

12 files changed, 844 insertions, 0 deletions

diff --git a/mb/1systems/orange/configuration.nix b/mb/1systems/orange/configuration.nix
new file mode 100644
index 000000000..4ac0996a4
--- /dev/null
+++ b/mb/1systems/orange/configuration.nix
@@ -0,0 +1,232 @@
+{ config, pkgs, callPackage, ... }: let
+    unstable = import <nixpkgs-unstable> { config = { allowUnfree = true; }; };
+in {
+  imports =
+    [ # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+      <stockholm/mb>
+    ];
+
+  krebs.build.host = config.krebs.hosts.orange;
+
+  boot.kernelPackages = pkgs.linuxPackages_latest;
+  boot.extraModulePackages = with config.boot.kernelPackages; [ wireguard ];
+
+  # Use the systemd-boot EFI boot loader.
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  boot.initrd.luks.devices = [
+    {
+      name = "root";
+      device = "/dev/disk/by-uuid/09a36f91-a713-4b82-8b41-4e7a6acc4acf";
+      preLVM = true;
+      allowDiscards = true;
+    }
+  ];
+
+  fileSystems."/".options = [ "noatime" "nodiratime" "discard" ];
+  fileSystems."/mnt/public" = {
+    device = "//192.168.88.252/public";
+    fsType = "cifs";
+    options = let
+      automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s";
+    in [ "${automount_opts},user,rw,username=mb0,iocharset=utf8,credentials=${config.users.users.mb.home}/.smbcredentials" ];
+  };
+
+  #networking.hostName = "0r4n93";
+  networking.wireless.enable = false;
+
+  # Select internationalisation properties.
+  i18n = {
+    consoleFont = "Lat2-Terminus16";
+    consoleKeyMap = "de";
+    defaultLocale = "en_US.UTF-8";
+  };
+
+  time.timeZone = "Europe/Berlin";
+
+  nixpkgs.config.packageOverrides = super: {
+    openvpn = super.openvpn.override { pkcs11Support = true; useSystemd = false; };
+  };
+
+  nixpkgs.config.allowUnfree = true;
+
+  fonts = {
+    enableCoreFonts = true;
+    enableGhostscriptFonts = true;
+    fonts = with pkgs; [
+      anonymousPro
+      corefonts
+      dejavu_fonts
+      envypn-font
+      fira
+      gentium
+      gohufont
+      inconsolata
+      liberation_ttf
+      powerline-fonts
+      source-code-pro
+      terminus_font
+      ttf_bitstream_vera
+      ubuntu_font_family
+      unifont
+      unstable.cherry
+      xorg.fontbitstream100dpi
+      xorg.fontbitstream75dpi
+      xorg.fontbitstreamtype1
+    ];
+  };
+
+  environment.systemPackages = with pkgs; [
+    adapta-gtk-theme
+    aircrackng
+    ag
+    arandr
+    binutils
+    chromium
+    cifs-utils
+    curl
+    evince
+    exfat
+    feh
+    file
+    firefox
+    freetype
+    gimp
+    git
+    gnupg
+    graphite2
+    hicolor_icon_theme
+    htop
+    i3lock
+    jq
+    keepassx2
+    kvm
+    lxappearance
+    man-pages
+    moc
+    mpv
+    mpvc
+    mupdf
+    ncdu
+    nmap
+    openvpn
+    pass
+    p7zip
+    powertop
+    ranger
+    rofi
+    sshfs
+    tcpdump
+    tmux
+    traceroute
+    tree
+    unstable.alacritty
+    unstable.ponyc
+    unstable.sublime3
+    unstable.youtube-dl
+    vim
+    virt-viewer
+    virtmanager
+    vulnix
+    wcalc
+    wget
+    wireshark-gtk
+    xz
+  ];
+
+  environment.shellAliases = {
+    ll = "ls -alh";
+    ls = "ls --color=tty";
+  };
+
+  virtualisation.libvirtd.enable = true;
+  #virtualisation.kvmgt.enable = true;
+
+  programs.gnupg.agent = {
+    enable = true;
+    enableSSHSupport = true;
+  };
+
+  sound.enable = true;
+  hardware.pulseaudio.enable = true;
+
+  services.xserver = {
+    enable = true;
+    layout = "de";
+    xkbVariant = "nodeadkeys";
+    libinput.enable = true;
+    desktopManager = {
+      default = "xfce";
+      xterm.enable = false;
+      xfce = {
+        enable = true;
+        noDesktop = true;
+        enableXfwm = false;
+      };
+    };
+    windowManager.ratpoison.enable = true;
+  };
+
+  services.openssh.enable = true;
+  #services.openssh.permitRootLogin = "yes";
+  services.openssh.passwordAuthentication = false;
+
+  networking.networkmanager.enable = false;
+  #networking.nameservers = [ "8.8.8.8" "141.1.1.1" ];
+  networking.enableIPv6 = false;
+
+  programs.fish = {
+    enable = true;
+    shellInit = ''
+      function ssh_agent --description 'launch the ssh-agent and add the id_rsa identity'
+          if begin
+              set -q SSH_AGENT_PID
+              and kill -0 $SSH_AGENT_PID
+              and grep -q '^ssh-agent' /proc/$SSH_AGENT_PID/cmdline
+          end
+              echo "ssh-agent running on pid $SSH_AGENT_PID"
+          else
+              eval (command ssh-agent -c | sed 's/^setenv/set -Ux/')
+          end
+          set -l identity $HOME/.ssh/id_rsa
+          set -l fingerprint (ssh-keygen -lf $identity | awk '{print $2}')
+          ssh-add -l | grep -q $fingerprint
+            or ssh-add $identity
+      end
+    '';
+    promptInit = ''
+      function fish_prompt --description 'Write out the prompt'
+          set -l color_cwd
+          set -l suffix
+          set -l nix_shell_info (
+              if test "$IN_NIX_SHELL" != ""
+                 echo -n " <nix-shell>"
+              end
+          )
+          switch "$USER"
+              case root toor
+                  if set -q fish_color_cwd_root
+                      set color_cwd $fish_color_cwd_root
+                  else
+                      set color_cwd $fish_color_cwd
+                  end
+                  set suffix '#'
+              case '*'
+                  set color_cwd $fish_color_cwd
+                  set suffix '>'
+          end
+
+          echo -n -s "$USER" @ (set_color yellow) (prompt_hostname) (set_color normal) "$nix_shell_info" ' ' (set_color $color_cwd) (prompt_pwd) (set_color normal) "$suffix "
+      end
+    '';
+  };
+
+  nix.maxJobs = 4;
+  nix.buildCores = 4;
+  system.autoUpgrade.enable = false;
+  system.autoUpgrade.channel = "https://nixos.org/channels/nixos-19.03";
+  system.stateVersion = "19.03";
+
+}
diff --git a/mb/1systems/orange/hardware-configuration.nix b/mb/1systems/orange/hardware-configuration.nix
new file mode 100644
index 000000000..8aa191269
--- /dev/null
+++ b/mb/1systems/orange/hardware-configuration.nix
@@ -0,0 +1,28 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, ... }:
+
+{
+  imports =
+    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ahci" "ohci_pci" "ehci_pci" "pata_atiixp" "usb_storage" "usbhid" "sd_mod" "sr_mod" ];
+  boot.kernelModules = [ "kvm-amd" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/b1d32c54-35f8-4bf1-9fd2-82adc760af01";
+      fsType = "btrfs";
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/BF9B-03A2";
+      fsType = "vfat";
+    };
+
+  swapDevices = [ ];
+
+  nix.maxJobs = lib.mkDefault 4;
+}
diff --git a/mb/1systems/p1nk/configuration.nix b/mb/1systems/p1nk/configuration.nix
new file mode 100644
index 000000000..28a7c7776
--- /dev/null
+++ b/mb/1systems/p1nk/configuration.nix
@@ -0,0 +1,223 @@
+{ config, pkgs, callPackage, ... }: let
+  unstable = import <nixpkgs-unstable> { config = { allowUnfree = true; }; };
+in {
+  imports =
+    [ # Include the results of the hardware scan.
+      ./hardware-configuration.nix
+      <stockholm/mb>
+    ];
+
+  krebs.build.host = config.krebs.hosts.p1nk;
+
+  boot.loader.systemd-boot.enable = true;
+  boot.loader.efi.canTouchEfiVariables = true;
+
+  boot.initrd.luks.devices = [
+    {
+      name = "root";
+      device = "/dev/disk/by-uuid/0392257b-f6cf-484d-8c46-e20aab4fddb7";
+      preLVM = true;
+      allowDiscards = true;
+    }
+  ];
+  fileSystems."/".options = [ "noatime" "nodiratime" "discard" ];
+  fileSystems."/mnt/public" = {
+    device = "//192.168.88.252/public";
+    fsType = "cifs";
+    options = let
+      automount_opts = "x-systemd.automount,noauto,x-systemd.idle-timeout=60,x-systemd.device-timeout=5s,x-systemd.mount-timeout=5s";
+    in [ "${automount_opts},user,rw,username=mb0,iocharset=utf8,credentials=${config.users.users.mb.home}/.smbcredentials" ];
+  };
+
+  networking.wireless.enable = true;
+
+  i18n = {
+    consoleFont = "Lat2-Terminus16";
+    consoleKeyMap = "de";
+    defaultLocale = "en_US.UTF-8";
+  };
+
+  time.timeZone = "Europe/Berlin";
+
+  fonts = {
+    enableCoreFonts = true;
+    enableGhostscriptFonts = true;
+    fonts = with pkgs; [
+      anonymousPro
+      corefonts
+      dejavu_fonts
+      envypn-font
+      fira
+      gentium
+      gohufont
+      inconsolata
+      liberation_ttf
+      powerline-fonts
+      source-code-pro
+      terminus_font
+      ttf_bitstream_vera
+      ubuntu_font_family
+      unifont
+      unstable.cherry
+      xorg.fontbitstream100dpi
+      xorg.fontbitstream75dpi
+      xorg.fontbitstreamtype1
+    ];
+  };
+
+  nixpkgs.config.packageOverrides = super: {
+    openvpn = super.openvpn.override { pkcs11Support = true; useSystemd = false; };
+  };
+
+  nixpkgs.config.allowUnfree = true;
+
+  environment.systemPackages = with pkgs; [
+    adapta-gtk-theme
+    aircrackng
+    ag
+    arandr
+    binutils
+    chromium
+    cifs-utils
+    curl
+    evince
+    exfat
+    feh
+    file
+    firefox
+    freetype
+    gimp
+    git
+    gnupg
+    graphite2
+    hicolor_icon_theme
+    htop
+    i3lock
+    jq
+    keepassx2
+    kvm
+    lxappearance
+    man-pages
+    moc
+    mpv
+    mpvc
+    mupdf
+    ncdu
+    nmap
+    openvpn
+    pass
+    p7zip
+    powertop
+    ranger
+    rofi
+    sshfs
+    tcpdump
+    tmux
+    traceroute
+    tree
+    unstable.alacritty
+    unstable.ponyc
+    unstable.sublime3
+    youtube-dl
+    vim
+    virt-viewer
+    virtmanager
+    vulnix
+    wcalc
+    wget
+    xz
+  ];
+
+  environment.shellAliases = {
+    ll = "ls -alh";
+    ls = "ls --color=tty";
+  };
+
+  virtualisation.libvirtd.enable = true;
+  virtualisation.kvmgt.enable = true;
+
+  programs.gnupg.agent = {
+    enable = true;
+    enableSSHSupport = true;
+  };
+
+  sound.enable = true;
+  hardware.pulseaudio.enable = true;
+
+  services.xserver = {
+    enable = true;
+    layout = "de";
+    xkbOptions = "neo";
+    libinput.enable = true;
+    desktopManager = {
+      default = "xfce";
+      xterm.enable = false;
+      xfce = {
+        enable = true;
+        noDesktop = true;
+        enableXfwm = false;
+      };
+    };
+    windowManager.ratpoison.enable = true;
+  };
+
+  services.openssh.enable = true;
+  services.openssh.passwordAuthentication = false;
+
+  networking.networkmanager.enable = false;
+  networking.nameservers = [ "8.8.8.8" "141.1.1.1" ];
+  networking.enableIPv6 = false;
+
+  programs.fish = {
+    enable = true;
+    shellInit = ''
+      function ssh_agent --description 'launch the ssh-agent and add the id_rsa identity'
+          if begin
+              set -q SSH_AGENT_PID
+              and kill -0 $SSH_AGENT_PID
+              and grep -q '^ssh-agent' /proc/$SSH_AGENT_PID/cmdline
+          end
+              echo "ssh-agent running on pid $SSH_AGENT_PID"
+          else
+              eval (command ssh-agent -c | sed 's/^setenv/set -Ux/')
+          end
+          set -l identity $HOME/.ssh/id_rsa
+          set -l fingerprint (ssh-keygen -lf $identity | awk '{print $2}')
+          ssh-add -l | grep -q $fingerprint
+            or ssh-add $identity
+      end
+    '';
+    promptInit = ''
+      function fish_prompt --description 'Write out the prompt'
+          set -l color_cwd
+          set -l suffix
+          set -l nix_shell_info (
+              if test "$IN_NIX_SHELL" != ""
+                 echo -n " <nix-shell>"
+              end
+          )
+          switch "$USER"
+              case root toor
+                  if set -q fish_color_cwd_root
+                      set color_cwd $fish_color_cwd_root
+                  else
+                      set color_cwd $fish_color_cwd
+                  end
+                  set suffix '#'
+              case '*'
+                  set color_cwd $fish_color_cwd
+                  set suffix '>'
+          end
+
+          echo -n -s "$USER" @ (set_color magenta) (prompt_hostname) (set_color normal) "$nix_shell_info" ' ' (set_color $color_cwd) (prompt_pwd) (set_color normal) "$suffix "
+      end
+    '';
+  };
+
+  nix.maxJobs = 4;
+  nix.buildCores = 4;
+  system.autoUpgrade.enable = false;
+  system.autoUpgrade.channel = "https://nixos.org/channels/nixos-19.03";
+  system.stateVersion = "19.03";
+
+}
diff --git a/mb/1systems/p1nk/hardware-configuration.nix b/mb/1systems/p1nk/hardware-configuration.nix
new file mode 100644
index 000000000..ab5b6e204
--- /dev/null
+++ b/mb/1systems/p1nk/hardware-configuration.nix
@@ -0,0 +1,29 @@
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, ... }:
+
+{
+  imports =
+    [ <nixpkgs/nixos/modules/installer/scan/not-detected.nix>
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "ehci_pci" "ahci" "usb_storage" "sd_mod" "rtsx_pci_sdmmc" ];
+  boot.kernelModules = [ "kvm-intel" ];
+  boot.extraModulePackages = [ ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/4cc2add6-ed19-4685-bbd9-b992bd8d51fb";
+      fsType = "btrfs";
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/9F87-AEAA";
+      fsType = "vfat";
+    };
+
+  swapDevices = [ ];
+
+  nix.maxJobs = lib.mkDefault 4;
+  powerManagement.cpuFreqGovernor = lib.mkDefault "powersave";
+}
diff --git a/mb/2configs/default.nix b/mb/2configs/default.nix
new file mode 100644
index 000000000..75189e192
--- /dev/null
+++ b/mb/2configs/default.nix
@@ -0,0 +1,198 @@
+with import <stockholm/lib>;
+{ config, pkgs, ... }:
+{
+  imports = [
+    {
+      users.users = {
+        root = {
+          openssh.authorizedKeys.keys = [
+            config.krebs.users.mb.pubkey
+          ];
+        };
+        mb = {
+          name = "mb";
+          uid = 1337;
+          home = "/home/mb";
+          group = "users";
+          createHome = true;
+          shell = "/run/current-system/sw/bin/fish";
+          extraGroups = [
+            "audio"
+            "video"
+            "fuse"
+            "wheel"
+          ];
+          openssh.authorizedKeys.keys = [
+            config.krebs.users.mb.pubkey
+          ];
+        };
+      };
+    }
+    {
+      environment.variables = {
+        NIX_PATH = mkForce "secrets=/var/src/stockholm/null:/var/src";
+      };
+    }
+    (let ca-bundle = "/etc/ssl/certs/ca-bundle.crt"; in {
+      environment.variables = {
+        CURL_CA_BUNDLE = ca-bundle;
+        GIT_SSL_CAINFO = ca-bundle;
+        SSL_CERT_FILE = ca-bundle;
+      };
+    })
+  ];
+
+  networking.hostName = config.krebs.build.host.name;
+
+  krebs = {
+    enable = true;
+    build.user = config.krebs.users.mb;
+  };
+
+  users.mutableUsers = false;
+
+  services.timesyncd.enable = mkForce true;
+
+  systemd.tmpfiles.rules = [
+    "d /tmp 1777 root root - -"
+  ];
+
+  # multiple-definition-problem when defining environment.variables.EDITOR
+  environment.extraInit = ''
+    EDITOR=vim
+  '';
+
+  nixpkgs.config.allowUnfree = true;
+
+  environment.systemPackages = with pkgs; [
+  #stockholm
+    git
+    gnumake
+    jq
+    parallel
+    proot
+    populate
+
+  #style
+    most
+    rxvt_unicode.terminfo
+
+  #monitoring tools
+    htop
+    iotop
+
+  #network
+    iptables
+    iftop
+    tcpdump
+
+  #stuff for dl
+    aria2
+
+  #neat utils
+    fish
+    file
+    kpaste
+    krebspaste
+    mosh
+    pciutils
+    psmisc
+    tmux
+    untilport
+    usbutils
+
+  #unpack stuff
+    p7zip
+
+    (pkgs.writeDashBin "sshn" ''
+      ${pkgs.openssh}/bin/ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no "$@"
+    '')
+  ];
+
+  services.openssh = {
+    enable = true;
+    permitRootLogin = "yes";
+    passwordAuthentication = false;
+    hostKeys = [
+      # XXX bits here make no science
+      { bits = 8192; type = "ed25519"; path = "/etc/ssh/ssh_host_ed25519_key"; }
+    ];
+  };
+
+  programs.fish = {
+    enable = true;
+    shellInit = ''
+      function ssh_agent --description 'launch the ssh-agent and add the id_rsa identity'
+          if begin
+              set -q SSH_AGENT_PID
+              and kill -0 $SSH_AGENT_PID
+              and grep -q '^ssh-agent' /proc/$SSH_AGENT_PID/cmdline
+          end
+              echo "ssh-agent running on pid $SSH_AGENT_PID"
+          else
+              eval (command ssh-agent -c | sed 's/^setenv/set -Ux/')
+          end
+          set -l identity $HOME/.ssh/id_rsa
+          set -l fingerprint (ssh-keygen -lf $identity | awk '{print $2}')
+          ssh-add -l | grep -q $fingerprint
+            or ssh-add $identity
+      end
+    '';
+    promptInit = ''
+      function fish_prompt --description 'Write out the prompt'
+          set -l color_cwd
+          set -l suffix
+          set -l nix_shell_info (
+              if test "$IN_NIX_SHELL" != ""
+                 echo -n " <nix-shell>"
+              end
+          )
+          switch "$USER"
+              case root toor
+                  if set -q fish_color_cwd_root
+                      set color_cwd $fish_color_cwd_root
+                  else
+                      set color_cwd $fish_color_cwd
+                  end
+                  set suffix '#'
+              case '*'
+                  set color_cwd $fish_color_cwd
+                  set suffix '>'
+          end
+
+          echo -n -s "$USER" @ (set_color yellow) (prompt_hostname) (set_color normal) "$nix_shell_info" ' ' (set_color $color_cwd) (prompt_pwd) (set_color normal) "$suffix "
+      end
+    '';
+  };
+
+  services.journald.extraConfig = ''
+    SystemMaxUse=1G
+    RuntimeMaxUse=128M
+  '';
+
+  krebs.iptables = {
+    enable = true;
+    tables = {
+      nat.PREROUTING.rules = [
+        { predicate = "! -i retiolum -p tcp -m tcp --dport 22"; target = "REDIRECT --to-ports 0"; precedence = 100; }
+        { predicate = "-p tcp -m tcp --dport 45621"; target = "REDIRECT --to-ports 22"; precedence = 99; }
+      ];
+      nat.OUTPUT.rules = [
+        { predicate = "-o lo -p tcp -m tcp --dport 45621"; target = "REDIRECT --to-ports 22"; precedence = 100; }
+      ];
+      filter.INPUT.policy = "DROP";
+      filter.FORWARD.policy = "DROP";
+      filter.INPUT.rules = [
+        { predicate = "-i retiolum -p udp --dport 60000:61000"; target = "ACCEPT";}
+        { predicate = "-m conntrack --ctstate RELATED,ESTABLISHED"; target = "ACCEPT"; precedence = 10001; }
+        { predicate = "-p icmp"; target = "ACCEPT"; precedence = 10000; }
+        { predicate = "-p ipv6-icmp"; target = "ACCEPT"; v4 = false;  precedence = 10000; }
+        { predicate = "-i lo"; target = "ACCEPT"; precedence = 9999; }
+        { predicate = "-p tcp --dport 22"; target = "ACCEPT"; precedence = 9998; }
+        { predicate = "-p tcp -i retiolum"; target = "REJECT --reject-with tcp-reset"; precedence = -10000; }
+        { predicate = "-p udp -i retiolum"; target = "REJECT --reject-with icmp-port-unreachable"; v6 = false; precedence = -10000; }
+        { predicate = "-i retiolum"; target = "REJECT --reject-with icmp-proto-unreachable"; v6 = false; precedence = -10000; }
+      ];
+    };
+  };
+}
diff --git a/mb/2configs/retiolum.nix b/mb/2configs/retiolum.nix
new file mode 100644
index 000000000..5a87d52af
--- /dev/null
+++ b/mb/2configs/retiolum.nix
@@ -0,0 +1,33 @@
+{ config, pkgs, ... }:
+
+{
+
+  krebs.iptables = {
+    tables = {
+      filter.INPUT.rules = let
+        tincport = toString config.krebs.build.host.nets.retiolum.tinc.port;
+      in [
+        { predicate = "-p tcp --dport ${tincport}"; target = "ACCEPT"; }
+        { predicate = "-p udp --dport ${tincport}"; target = "ACCEPT"; }
+      ];
+    };
+  };
+
+  krebs.tinc.retiolum = {
+    enableLegacy = true;
+    enable = true;
+    connectTo = [
+      "prism"
+      "gum"
+      "ni"
+    ];
+  };
+
+  nixpkgs.config.packageOverrides = pkgs: {
+    tinc = pkgs.tinc_pre;
+  };
+
+  environment.systemPackages = [
+    pkgs.tinc
+  ];
+}
diff --git a/mb/2configs/tests/dummy-secrets/retiolum.rsa b/mb/2configs/tests/dummy-secrets/retiolum.rsa
new file mode 100644
index 000000000..99a4033f6
--- /dev/null
+++ b/mb/2configs/tests/dummy-secrets/retiolum.rsa
@@ -0,0 +1,4 @@
+
+-----BEGIN RSA PRIVATE KEY-----
+this is a private key
+-----END RSA PRIVATE KEY-----
diff --git a/mb/3modules/default.nix b/mb/3modules/default.nix
new file mode 100644
index 000000000..99d09d4ec
--- /dev/null
+++ b/mb/3modules/default.nix
@@ -0,0 +1,6 @@
+_:
+{
+  imports = [
+    ./hosts.nix
+  ];
+}
diff --git a/mb/3modules/hosts.nix b/mb/3modules/hosts.nix
new file mode 100644
index 000000000..5dc9b5ca4
--- /dev/null
+++ b/mb/3modules/hosts.nix
@@ -0,0 +1,12 @@
+{ config, ... }:
+
+with import <stockholm/lib>;
+
+{
+  options.mb.hosts = mkOption {
+    type = types.attrsOf types.host;
+    default =
+      filterAttrs (_: host: host.owner.name == "mb" && host.ci)
+      config.krebs.hosts;
+  };
+}
diff --git a/mb/5pkgs/default.nix b/mb/5pkgs/default.nix
new file mode 100644
index 000000000..3fa5b5e85
--- /dev/null
+++ b/mb/5pkgs/default.nix
@@ -0,0 +1,11 @@
+with import <stockholm/lib>;
+
+self: super:
+
+# Import files and subdirectories like they are overlays.
+foldl' mergeAttrs {}
+  (map
+    (name: import (./. + "/${name}") self super)
+    (filter
+      (name: name != "default.nix" && !hasPrefix "." name)
+      (attrNames (readDir ./.))))
diff --git a/mb/default.nix b/mb/default.nix
new file mode 100644
index 000000000..0bec0c2c2
--- /dev/null
+++ b/mb/default.nix
@@ -0,0 +1,14 @@
+{ config, pkgs, ... }:
+{
+  imports = [
+    ../krebs
+    ./2configs
+    ./3modules
+  ];
+  nixpkgs.config.packageOverrides = import ./5pkgs pkgs;
+  krebs.tinc.retiolum.privkey = {
+    source-path = toString <secrets> + "/${config.krebs.tinc.retiolum.netname}.rsa";
+    path = "${config.krebs.tinc.retiolum.user.home}/tinc.rsa_key.priv";
+    owner = config.krebs.tinc.retiolum.user;
+  };
+}
diff --git a/mb/krops.nix b/mb/krops.nix
new file mode 100644
index 000000000..cb9ab3fdb
--- /dev/null
+++ b/mb/krops.nix
@@ -0,0 +1,54 @@
+{ name }: let
+  inherit (import ../krebs/krops.nix { inherit name; })
+    krebs-source
+    lib
+    pkgs
+  ;
+
+  host-source = if lib.pathExists (./. + "/1systems/${name}/source.nix") then
+    import (./. + "/1systems/${name}/source.nix") { inherit lib pkgs; }
+  else
+    {}
+  ;
+
+  source = { test }: lib.evalSource ([
+    (krebs-source { test = test; })
+    {
+      nixos-config.symlink = "stockholm/mb/1systems/${name}/configuration.nix";
+      nixpkgs-unstable.git = {
+        url = "https://github.com/nixos/nixpkgs-channels";
+        ref = "nixos-unstable";
+      };
+      secrets = if test then {
+        file = toString ./2configs/tests/dummy-secrets;
+      } else {
+        pass = {
+          dir = "${lib.getEnv "HOME"}/.password-store";
+          name = "hosts/${name}";
+        };
+      };
+    }
+  ] ++ (lib.optional (! test) host-source));
+
+in {
+
+  # usage: $(nix-build --no-out-link --argstr name HOSTNAME -A deploy)
+  deploy = { target ? "root@${name}/var/src" }: pkgs.krops.writeDeploy "${name}-deploy" {
+    source = source { test = false; };
+    inherit target;
+  };
+
+  # usage: $(nix-build --no-out-link --argstr name HOSTNAME --argstr target PATH -A populate)
+  populate = { target, force ? false }: pkgs.populate {
+    inherit force;
+    source = source { test = false; };
+    target = lib.mkTarget target;
+  };
+
+  # usage: $(nix-build --no-out-link --argstr name HOSTNAME --argstr target PATH -A test)
+  test = { target }: pkgs.krops.writeTest "${name}-test" {
+    force = true;
+    inherit target;
+    source = source { test = true; };
+  };
+}