232 lines
7.5 KiB
Nix
232 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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in
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{
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imports = [
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./headless.nix
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./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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