google-compute-config: update config

nixos/modules/security/google_oslogin.nix

···
 let
 
   cfg = config.security.googleOsLogin;
-  package = pkgs.google-compute-engine-oslogin;
+  package = pkgs.google-guest-oslogin;
 
 in
 
···
       type = types.bool;
       default = false;
       description = ''
-        Whether to enable Google OS Login
+        Whether to enable Google OS Login.
 
         The OS Login package enables the following components:
         AuthorizedKeysCommand to query valid SSH keys from the user's OS Login
···
     security.pam.services.sshd = {
       makeHomeDir = true;
       googleOsLoginAccountVerification = true;
-      # disabled for now: googleOsLoginAuthentication = true;
+      googleOsLoginAuthentication = true;
     };
 
     security.sudo.extraConfig = ''
···
       "d /run/google-sudoers.d 750 root root -"
       "d /var/google-users.d 750 root root -"
     ];
+
+    systemd.packages = [ package ];
+    systemd.timers.google-oslogin-cache.wantedBy = [ "timers.target" ];
 
     # enable the nss module, so user lookups etc. work
     system.nssModules = [ package ];

nixos/modules/security/pam.nix

···
             account sufficient ${pam_krb5}/lib/security/pam_krb5.so
           '' +
           optionalString cfg.googleOsLoginAccountVerification ''
-            account [success=ok ignore=ignore default=die] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so
-            account [success=ok default=ignore] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_admin.so
+            account [success=ok ignore=ignore default=die] ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so
+            account [success=ok default=ignore] ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_admin.so
           '' +
           ''
 
             # Authentication management.
           '' +
           optionalString cfg.googleOsLoginAuthentication ''
-            auth [success=done perm_denied=bad default=ignore] ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so
+            auth [success=done perm_denied=die default=ignore] ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so
           '' +
           optionalString cfg.rootOK ''
             auth sufficient pam_rootok.so
···
         mr ${pam_ccreds}/lib/security/pam_ccreds.so,
       '' +
       optionalString (isEnabled (cfg: cfg.googleOsLoginAccountVerification)) ''
-        mr ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so,
-        mr ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_admin.so,
+        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so,
+        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_admin.so,
       '' +
       optionalString (isEnabled (cfg: cfg.googleOsLoginAuthentication)) ''
-        mr ${pkgs.google-compute-engine-oslogin}/lib/pam_oslogin_login.so,
+        mr ${pkgs.google-guest-oslogin}/lib/security/pam_oslogin_login.so,
       '' +
       optionalString (config.security.pam.enableSSHAgentAuth
                      && isEnabled (cfg: cfg.sshAgentAuth)) ''

nixos/modules/virtualisation/fetch-instance-ssh-keys.bash

···
-#!/usr/bin/env bash
-
-set -euo pipefail
-
-WGET() {
-    wget --retry-connrefused -t 15 --waitretry=10 --header='Metadata-Flavor: Google' "$@"
-}
-
-# When dealing with cryptographic keys, we want to keep things private.
-umask 077
-mkdir -p /root/.ssh
-
-echo "Fetching authorized keys..."
-WGET -O /tmp/auth_keys http://metadata.google.internal/computeMetadata/v1/instance/attributes/sshKeys
-
-# Read keys one by one, split in case Google decided
-# to append metadata (it does sometimes) and add to
-# authorized_keys if not already present.
-touch /root/.ssh/authorized_keys
-while IFS='' read -r line || [[ -n "$line" ]]; do
-    keyLine=$(echo -n "$line" | cut -d ':' -f2)
-    IFS=' ' read -r -a array <<<"$keyLine"
-    if [[ ${#array[@]} -ge 3 ]]; then
-        echo "${array[@]:0:3}" >>/tmp/new_keys
-        echo "Added ${array[*]:2} to authorized_keys"
-    fi
-done </tmp/auth_keys
-mv /tmp/new_keys /root/.ssh/authorized_keys
-chmod 600 /root/.ssh/authorized_keys
-
-echo "Fetching host keys..."
-WGET -O /tmp/ssh_host_ed25519_key http://metadata.google.internal/computeMetadata/v1/instance/attributes/ssh_host_ed25519_key
-WGET -O /tmp/ssh_host_ed25519_key.pub http://metadata.google.internal/computeMetadata/v1/instance/attributes/ssh_host_ed25519_key_pub
-mv -f /tmp/ssh_host_ed25519_key* /etc/ssh/
-chmod 600 /etc/ssh/ssh_host_ed25519_key
-chmod 644 /etc/ssh/ssh_host_ed25519_key.pub

nixos/modules/virtualisation/google-compute-config.nix

···
 { config, lib, pkgs, ... }:
 with lib;
-let
-  gce = pkgs.google-compute-engine;
-in
 {
   imports = [
     ../profiles/headless.nix
···
   security.googleOsLogin.enable = true;
 
   # Use GCE udev rules for dynamic disk volumes
-  services.udev.packages = [ gce ];
+  services.udev.packages = [ pkgs.google-guest-configs ];
+  services.udev.path = [ pkgs.google-guest-configs ];
 
   # Force getting the hostname from Google Compute.
   networking.hostName = mkDefault "";
 
   # Always include cryptsetup so that NixOps can use it.
   environment.systemPackages = [ pkgs.cryptsetup ];
-
-  # Make sure GCE image does not replace host key that NixOps sets
-  environment.etc."default/instance_configs.cfg".text = lib.mkDefault ''
-    [InstanceSetup]
-    set_host_keys = false
-  '';
 
   # Rely on GCP's firewall instead
   networking.firewall.enable = mkDefault false;
···
   # GC has 1460 MTU
   networking.interfaces.eth0.mtu = 1460;
 
-  # Used by NixOps
-  systemd.services.fetch-instance-ssh-keys = {
-    description = "Fetch host keys and authorized_keys for root user";
+  systemd.packages = [ pkgs.google-guest-agent ];
+  systemd.services.google-guest-agent = {
+    wantedBy = [ "multi-user.target" ];
+    restartTriggers = [ config.environment.etc."default/instance_configs.cfg".source ];
+    path = lib.optional config.users.mutableUsers pkgs.shadow;
+  };
+  systemd.services.google-startup-scripts.wantedBy = [ "multi-user.target" ];
+  systemd.services.google-shutdown-scripts.wantedBy = [ "multi-user.target" ];
 
-    wantedBy = [ "sshd.service" ];
-    before = [ "sshd.service" ];
-    after = [ "network-online.target" ];
-    wants = [ "network-online.target" ];
-    path = [ pkgs.wget ];
+  security.sudo.extraRules = mkIf config.users.mutableUsers [
+    { groups = [ "google-sudoers" ]; commands = [ { command = "ALL"; options = [ "NOPASSWD" ]; } ]; }
+  ];
 
-    serviceConfig = {
-      Type = "oneshot";
-      ExecStart = pkgs.runCommand "fetch-instance-ssh-keys" { } ''
-        cp ${./fetch-instance-ssh-keys.bash} $out
-        chmod +x $out
-        ${pkgs.shfmt}/bin/shfmt -i 4 -d $out
-        ${pkgs.shellcheck}/bin/shellcheck $out
-        patchShebangs $out
-      '';
-      PrivateTmp = true;
-      StandardError = "journal+console";
-      StandardOutput = "journal+console";
-    };
-  };
+  users.groups.google-sudoers = mkIf config.users.mutableUsers { };
 
-  systemd.services.google-instance-setup = {
-    description = "Google Compute Engine Instance Setup";
-    after = [ "network-online.target" "network.target" "rsyslog.service" ];
-    before = [ "sshd.service" ];
-    path = with pkgs; [ coreutils ethtool openssh ];
-    serviceConfig = {
-      ExecStart = "${gce}/bin/google_instance_setup";
-      StandardOutput="journal+console";
-      Type = "oneshot";
-    };
-    wantedBy = [ "sshd.service" "multi-user.target" ];
-  };
+  boot.extraModprobeConfig = lib.readFile "${pkgs.google-guest-configs}/etc/modprobe.d/gce-blacklist.conf";
 
-  systemd.services.google-network-daemon = {
-    description = "Google Compute Engine Network Daemon";
-    after = [ "network-online.target" "network.target" "google-instance-setup.service" ];
-    path = with pkgs; [ iproute2 ];
-    serviceConfig = {
-      ExecStart = "${gce}/bin/google_network_daemon";
-      StandardOutput="journal+console";
-      Type="simple";
-    };
-    wantedBy = [ "multi-user.target" ];
-  };
+  environment.etc."sysctl.d/60-gce-network-security.conf".source = "${pkgs.google-guest-configs}/etc/sysctl.d/60-gce-network-security.conf";
 
-  systemd.services.google-clock-skew-daemon = {
-    description = "Google Compute Engine Clock Skew Daemon";
-    after = [ "network.target" "google-instance-setup.service" "google-network-daemon.service" ];
-    serviceConfig = {
-      ExecStart = "${gce}/bin/google_clock_skew_daemon";
-      StandardOutput="journal+console";
-      Type = "simple";
-    };
-    wantedBy = ["multi-user.target"];
-  };
+  environment.etc."default/instance_configs.cfg".text = ''
+    [Accounts]
+    useradd_cmd = useradd -m -s /run/current-system/sw/bin/bash -p * {user}
 
+    [Daemons]
+    accounts_daemon = ${boolToString config.users.mutableUsers}
 
-  systemd.services.google-shutdown-scripts = {
-    description = "Google Compute Engine Shutdown Scripts";
-    after = [
-      "network-online.target"
-      "network.target"
-      "rsyslog.service"
-      "google-instance-setup.service"
-      "google-network-daemon.service"
-    ];
-    serviceConfig = {
-      ExecStart = "${pkgs.coreutils}/bin/true";
-      ExecStop = "${gce}/bin/google_metadata_script_runner --script-type shutdown";
-      RemainAfterExit = true;
-      StandardOutput="journal+console";
-      TimeoutStopSec = "0";
-      Type = "oneshot";
-    };
-    wantedBy = [ "multi-user.target" ];
-  };
+    [InstanceSetup]
+    # Make sure GCE image does not replace host key that NixOps sets.
+    set_host_keys = false
 
-  systemd.services.google-startup-scripts = {
-    description = "Google Compute Engine Startup Scripts";
-    after = [
-      "network-online.target"
-      "network.target"
-      "rsyslog.service"
-      "google-instance-setup.service"
-      "google-network-daemon.service"
-    ];
-    serviceConfig = {
-      ExecStart = "${gce}/bin/google_metadata_script_runner --script-type startup";
-      KillMode = "process";
-      StandardOutput = "journal+console";
-      Type = "oneshot";
-    };
-    wantedBy = [ "multi-user.target" ];
-  };
+    [MetadataScripts]
+    default_shell = ${pkgs.stdenv.shell}
 
-  environment.etc."sysctl.d/11-gce-network-security.conf".source = "${gce}/sysctl.d/11-gce-network-security.conf";
+    [NetworkInterfaces]
+    dhclient_script = ${pkgs.google-guest-configs}/bin/google-dhclient-script
+    # We set up network interfaces declaratively.
+    setup = false
+  '';
 }

nixos/tests/google-oslogin/default.nix

···
 
     # mockserver should return a non-expired ssh key for both mockuser and mockadmin
     server.succeed(
-        f'${pkgs.google-compute-engine-oslogin}/bin/google_authorized_keys {MOCKUSER} | grep -q "${snakeOilPublicKey}"'
+        f'${pkgs.google-guest-oslogin}/bin/google_authorized_keys {MOCKUSER} | grep -q "${snakeOilPublicKey}"'
     )
     server.succeed(
-        f'${pkgs.google-compute-engine-oslogin}/bin/google_authorized_keys {MOCKADMIN} | grep -q "${snakeOilPublicKey}"'
+        f'${pkgs.google-guest-oslogin}/bin/google_authorized_keys {MOCKADMIN} | grep -q "${snakeOilPublicKey}"'
     )
 
     # install snakeoil ssh key on the client, and provision .ssh/config file

nixos/tests/google-oslogin/server.nix

···
   security.googleOsLogin.enable = true;
 
   # Mock google service
-  networking.extraHosts = ''
-    127.0.0.1 metadata.google.internal
-  '';
+  networking.interfaces.lo.ipv4.addresses = [ { address = "169.254.169.254"; prefixLength = 32; } ];
 }

nixos/tests/ssh-keys.nix

···
   snakeOilPublicKey = pkgs.lib.concatStrings [
     "ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHA"
     "yNTYAAABBBChdA2BmwcG49OrQN33f/sj+OHL5sJhwVl2Qim0vkUJQCry1zFpKTa"
-    "9ZcDMiWaEhoAR6FGoaGI04ff7CS+1yybQ= sakeoil"
+    "9ZcDMiWaEhoAR6FGoaGI04ff7CS+1yybQ= snakeoil"
   ];
 }