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706efadcb6
Use googleOsLogin for login instead. This allows setting users.mutableUsers back to false, and to strip the security.sudo.extraConfig. security.sudo.enable is default anyhow, so we can remove that as well.
236 lines
7.5 KiB
Nix
236 lines
7.5 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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gce = pkgs.google-compute-engine;
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cfg = config.virtualisation.googleComputeImage;
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in
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{
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imports = [
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../profiles/headless.nix
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../profiles/qemu-guest.nix
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];
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fileSystems."/" = {
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device = "/dev/disk/by-label/nixos";
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autoResize = true;
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};
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boot.growPartition = true;
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boot.kernelParams = [ "console=ttyS0" "panic=1" "boot.panic_on_fail" ];
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boot.initrd.kernelModules = [ "virtio_scsi" ];
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boot.kernelModules = [ "virtio_pci" "virtio_net" ];
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# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
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boot.loader.grub.device = "/dev/sda";
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boot.loader.timeout = 0;
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# Don't put old configurations in the GRUB menu. The user has no
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# way to select them anyway.
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boot.loader.grub.configurationLimit = 0;
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# Allow root logins only using the SSH key that the user specified
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# at instance creation time.
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services.openssh.enable = true;
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services.openssh.permitRootLogin = "prohibit-password";
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services.openssh.passwordAuthentication = mkDefault false;
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# Use GCE udev rules for dynamic disk volumes
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services.udev.packages = [ gce ];
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# Force getting the hostname from Google Compute.
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networking.hostName = mkDefault "";
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# Always include cryptsetup so that NixOps can use it.
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environment.systemPackages = [ pkgs.cryptsetup ];
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# Make sure GCE image does not replace host key that NixOps sets
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environment.etc."default/instance_configs.cfg".text = lib.mkDefault ''
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[InstanceSetup]
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set_host_keys = false
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'';
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# Rely on GCP's firewall instead
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networking.firewall.enable = mkDefault false;
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# Configure default metadata hostnames
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networking.extraHosts = ''
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169.254.169.254 metadata.google.internal metadata
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'';
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networking.timeServers = [ "metadata.google.internal" ];
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networking.usePredictableInterfaceNames = false;
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# GC has 1460 MTU
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networking.interfaces.eth0.mtu = 1460;
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security.googleOsLogin.enable = true;
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systemd.services.google-clock-skew-daemon = {
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description = "Google Compute Engine Clock Skew Daemon";
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after = [
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"network.target"
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"google-instance-setup.service"
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"google-network-setup.service"
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];
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requires = ["network.target"];
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wantedBy = ["multi-user.target"];
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serviceConfig = {
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Type = "simple";
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ExecStart = "${gce}/bin/google_clock_skew_daemon --debug";
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};
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};
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systemd.services.google-instance-setup = {
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description = "Google Compute Engine Instance Setup";
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after = ["local-fs.target" "network-online.target" "network.target" "rsyslog.service"];
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before = ["sshd.service"];
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wants = ["local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "sshd.service" "multi-user.target" ];
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path = with pkgs; [ ethtool openssh ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_instance_setup --debug";
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Type = "oneshot";
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};
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};
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systemd.services.google-network-daemon = {
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description = "Google Compute Engine Network Daemon";
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after = ["local-fs.target" "network-online.target" "network.target" "rsyslog.service" "google-instance-setup.service"];
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wants = ["local-fs.target" "network-online.target" "network.target"];
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requires = ["network.target"];
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partOf = ["network.target"];
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ iproute ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_network_daemon --debug";
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};
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};
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systemd.services.google-shutdown-scripts = {
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description = "Google Compute Engine Shutdown Scripts";
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after = [
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"local-fs.target"
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"network-online.target"
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"network.target"
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"rsyslog.service"
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"systemd-resolved.service"
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"google-instance-setup.service"
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"google-network-daemon.service"
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];
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wants = [ "local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.coreutils}/bin/true";
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ExecStop = "${gce}/bin/google_metadata_script_runner --debug --script-type shutdown";
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Type = "oneshot";
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RemainAfterExit = true;
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TimeoutStopSec = "infinity";
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};
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};
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systemd.services.google-startup-scripts = {
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description = "Google Compute Engine Startup Scripts";
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after = [
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"local-fs.target"
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"network-online.target"
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"network.target"
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"rsyslog.service"
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"google-instance-setup.service"
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"google-network-daemon.service"
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];
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wants = ["local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_metadata_script_runner --debug --script-type startup";
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KillMode = "process";
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Type = "oneshot";
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};
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};
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# Settings taken from https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
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boot.kernel.sysctl = {
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# Turn on SYN-flood protections. Starting with 2.6.26, there is no loss
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# of TCP functionality/features under normal conditions. When flood
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# protections kick in under high unanswered-SYN load, the system
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# should remain more stable, with a trade off of some loss of TCP
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# functionality/features (e.g. TCP Window scaling).
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"net.ipv4.tcp_syncookies" = mkDefault "1";
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# ignores source-routed packets
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"net.ipv4.conf.all.accept_source_route" = mkDefault "0";
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# ignores source-routed packets
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"net.ipv4.conf.default.accept_source_route" = mkDefault "0";
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# ignores ICMP redirects
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"net.ipv4.conf.all.accept_redirects" = mkDefault "0";
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# ignores ICMP redirects
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"net.ipv4.conf.default.accept_redirects" = mkDefault "0";
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# ignores ICMP redirects from non-GW hosts
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"net.ipv4.conf.all.secure_redirects" = mkDefault "1";
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# ignores ICMP redirects from non-GW hosts
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"net.ipv4.conf.default.secure_redirects" = mkDefault "1";
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# don't allow traffic between networks or act as a router
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"net.ipv4.ip_forward" = mkDefault "0";
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# don't allow traffic between networks or act as a router
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"net.ipv4.conf.all.send_redirects" = mkDefault "0";
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# don't allow traffic between networks or act as a router
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"net.ipv4.conf.default.send_redirects" = mkDefault "0";
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# reverse path filtering - IP spoofing protection
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"net.ipv4.conf.all.rp_filter" = mkDefault "1";
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# reverse path filtering - IP spoofing protection
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"net.ipv4.conf.default.rp_filter" = mkDefault "1";
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# ignores ICMP broadcasts to avoid participating in Smurf attacks
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"net.ipv4.icmp_echo_ignore_broadcasts" = mkDefault "1";
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# ignores bad ICMP errors
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"net.ipv4.icmp_ignore_bogus_error_responses" = mkDefault "1";
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# logs spoofed, source-routed, and redirect packets
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"net.ipv4.conf.all.log_martians" = mkDefault "1";
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# log spoofed, source-routed, and redirect packets
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"net.ipv4.conf.default.log_martians" = mkDefault "1";
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# implements RFC 1337 fix
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"net.ipv4.tcp_rfc1337" = mkDefault "1";
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# randomizes addresses of mmap base, heap, stack and VDSO page
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"kernel.randomize_va_space" = mkDefault "2";
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# Reboot the machine soon after a kernel panic.
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"kernel.panic" = mkDefault "10";
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## Not part of the original config
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# provides protection from ToCToU races
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"fs.protected_hardlinks" = mkDefault "1";
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# provides protection from ToCToU races
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"fs.protected_symlinks" = mkDefault "1";
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# makes locating kernel addresses more difficult
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"kernel.kptr_restrict" = mkDefault "1";
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# set ptrace protections
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"kernel.yama.ptrace_scope" = mkOverride 500 "1";
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# set perf only available to root
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"kernel.perf_event_paranoid" = mkDefault "2";
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};
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}
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