forked from mirrors/nixpkgs
236 lines
7.5 KiB
Nix
236 lines
7.5 KiB
Nix
{ config, lib, pkgs, ... }:
|
|
with lib;
|
|
let
|
|
gce = pkgs.google-compute-engine;
|
|
in
|
|
{
|
|
imports = [
|
|
../profiles/headless.nix
|
|
../profiles/qemu-guest.nix
|
|
];
|
|
|
|
|
|
fileSystems."/" = {
|
|
fsType = "ext4";
|
|
device = "/dev/disk/by-label/nixos";
|
|
autoResize = true;
|
|
};
|
|
|
|
boot.growPartition = true;
|
|
boot.kernelParams = [ "console=ttyS0" "panic=1" "boot.panic_on_fail" ];
|
|
boot.initrd.kernelModules = [ "virtio_scsi" ];
|
|
boot.kernelModules = [ "virtio_pci" "virtio_net" ];
|
|
|
|
# Generate a GRUB menu. Amazon's pv-grub uses this to boot our kernel/initrd.
|
|
boot.loader.grub.device = "/dev/sda";
|
|
boot.loader.timeout = 0;
|
|
|
|
# Don't put old configurations in the GRUB menu. The user has no
|
|
# way to select them anyway.
|
|
boot.loader.grub.configurationLimit = 0;
|
|
|
|
# Allow root logins only using the SSH key that the user specified
|
|
# at instance creation time.
|
|
services.openssh.enable = true;
|
|
services.openssh.permitRootLogin = "prohibit-password";
|
|
services.openssh.passwordAuthentication = mkDefault false;
|
|
|
|
# Use GCE udev rules for dynamic disk volumes
|
|
services.udev.packages = [ gce ];
|
|
|
|
# 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;
|
|
|
|
# Configure default metadata hostnames
|
|
networking.extraHosts = ''
|
|
169.254.169.254 metadata.google.internal metadata
|
|
'';
|
|
|
|
networking.timeServers = [ "metadata.google.internal" ];
|
|
|
|
networking.usePredictableInterfaceNames = false;
|
|
|
|
# GC has 1460 MTU
|
|
networking.interfaces.eth0.mtu = 1460;
|
|
|
|
security.googleOsLogin.enable = true;
|
|
|
|
systemd.services.google-clock-skew-daemon = {
|
|
description = "Google Compute Engine Clock Skew Daemon";
|
|
after = [
|
|
"network.target"
|
|
"google-instance-setup.service"
|
|
"google-network-setup.service"
|
|
];
|
|
requires = ["network.target"];
|
|
wantedBy = ["multi-user.target"];
|
|
serviceConfig = {
|
|
Type = "simple";
|
|
ExecStart = "${gce}/bin/google_clock_skew_daemon --debug";
|
|
};
|
|
};
|
|
|
|
systemd.services.google-instance-setup = {
|
|
description = "Google Compute Engine Instance Setup";
|
|
after = ["local-fs.target" "network-online.target" "network.target" "rsyslog.service"];
|
|
before = ["sshd.service"];
|
|
wants = ["local-fs.target" "network-online.target" "network.target"];
|
|
wantedBy = [ "sshd.service" "multi-user.target" ];
|
|
path = with pkgs; [ ethtool openssh ];
|
|
serviceConfig = {
|
|
ExecStart = "${gce}/bin/google_instance_setup --debug";
|
|
Type = "oneshot";
|
|
};
|
|
};
|
|
|
|
systemd.services.google-network-daemon = {
|
|
description = "Google Compute Engine Network Daemon";
|
|
after = ["local-fs.target" "network-online.target" "network.target" "rsyslog.service" "google-instance-setup.service"];
|
|
wants = ["local-fs.target" "network-online.target" "network.target"];
|
|
requires = ["network.target"];
|
|
partOf = ["network.target"];
|
|
wantedBy = [ "multi-user.target" ];
|
|
path = with pkgs; [ iproute ];
|
|
serviceConfig = {
|
|
ExecStart = "${gce}/bin/google_network_daemon --debug";
|
|
};
|
|
};
|
|
|
|
systemd.services.google-shutdown-scripts = {
|
|
description = "Google Compute Engine Shutdown Scripts";
|
|
after = [
|
|
"local-fs.target"
|
|
"network-online.target"
|
|
"network.target"
|
|
"rsyslog.service"
|
|
"systemd-resolved.service"
|
|
"google-instance-setup.service"
|
|
"google-network-daemon.service"
|
|
];
|
|
wants = [ "local-fs.target" "network-online.target" "network.target"];
|
|
wantedBy = [ "multi-user.target" ];
|
|
serviceConfig = {
|
|
ExecStart = "${pkgs.coreutils}/bin/true";
|
|
ExecStop = "${gce}/bin/google_metadata_script_runner --debug --script-type shutdown";
|
|
Type = "oneshot";
|
|
RemainAfterExit = true;
|
|
TimeoutStopSec = "infinity";
|
|
};
|
|
};
|
|
|
|
systemd.services.google-startup-scripts = {
|
|
description = "Google Compute Engine Startup Scripts";
|
|
after = [
|
|
"local-fs.target"
|
|
"network-online.target"
|
|
"network.target"
|
|
"rsyslog.service"
|
|
"google-instance-setup.service"
|
|
"google-network-daemon.service"
|
|
];
|
|
wants = ["local-fs.target" "network-online.target" "network.target"];
|
|
wantedBy = [ "multi-user.target" ];
|
|
serviceConfig = {
|
|
ExecStart = "${gce}/bin/google_metadata_script_runner --debug --script-type startup";
|
|
KillMode = "process";
|
|
Type = "oneshot";
|
|
};
|
|
};
|
|
|
|
|
|
# Settings taken from https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
|
|
boot.kernel.sysctl = {
|
|
# Turn on SYN-flood protections. Starting with 2.6.26, there is no loss
|
|
# of TCP functionality/features under normal conditions. When flood
|
|
# protections kick in under high unanswered-SYN load, the system
|
|
# should remain more stable, with a trade off of some loss of TCP
|
|
# functionality/features (e.g. TCP Window scaling).
|
|
"net.ipv4.tcp_syncookies" = mkDefault "1";
|
|
|
|
# ignores source-routed packets
|
|
"net.ipv4.conf.all.accept_source_route" = mkDefault "0";
|
|
|
|
# ignores source-routed packets
|
|
"net.ipv4.conf.default.accept_source_route" = mkDefault "0";
|
|
|
|
# ignores ICMP redirects
|
|
"net.ipv4.conf.all.accept_redirects" = mkDefault "0";
|
|
|
|
# ignores ICMP redirects
|
|
"net.ipv4.conf.default.accept_redirects" = mkDefault "0";
|
|
|
|
# ignores ICMP redirects from non-GW hosts
|
|
"net.ipv4.conf.all.secure_redirects" = mkDefault "1";
|
|
|
|
# ignores ICMP redirects from non-GW hosts
|
|
"net.ipv4.conf.default.secure_redirects" = mkDefault "1";
|
|
|
|
# don't allow traffic between networks or act as a router
|
|
"net.ipv4.ip_forward" = mkDefault "0";
|
|
|
|
# don't allow traffic between networks or act as a router
|
|
"net.ipv4.conf.all.send_redirects" = mkDefault "0";
|
|
|
|
# don't allow traffic between networks or act as a router
|
|
"net.ipv4.conf.default.send_redirects" = mkDefault "0";
|
|
|
|
# reverse path filtering - IP spoofing protection
|
|
"net.ipv4.conf.all.rp_filter" = mkDefault "1";
|
|
|
|
# reverse path filtering - IP spoofing protection
|
|
"net.ipv4.conf.default.rp_filter" = mkDefault "1";
|
|
|
|
# ignores ICMP broadcasts to avoid participating in Smurf attacks
|
|
"net.ipv4.icmp_echo_ignore_broadcasts" = mkDefault "1";
|
|
|
|
# ignores bad ICMP errors
|
|
"net.ipv4.icmp_ignore_bogus_error_responses" = mkDefault "1";
|
|
|
|
# logs spoofed, source-routed, and redirect packets
|
|
"net.ipv4.conf.all.log_martians" = mkDefault "1";
|
|
|
|
# log spoofed, source-routed, and redirect packets
|
|
"net.ipv4.conf.default.log_martians" = mkDefault "1";
|
|
|
|
# implements RFC 1337 fix
|
|
"net.ipv4.tcp_rfc1337" = mkDefault "1";
|
|
|
|
# randomizes addresses of mmap base, heap, stack and VDSO page
|
|
"kernel.randomize_va_space" = mkDefault "2";
|
|
|
|
# Reboot the machine soon after a kernel panic.
|
|
"kernel.panic" = mkDefault "10";
|
|
|
|
## Not part of the original config
|
|
|
|
# provides protection from ToCToU races
|
|
"fs.protected_hardlinks" = mkDefault "1";
|
|
|
|
# provides protection from ToCToU races
|
|
"fs.protected_symlinks" = mkDefault "1";
|
|
|
|
# makes locating kernel addresses more difficult
|
|
"kernel.kptr_restrict" = mkDefault "1";
|
|
|
|
# set ptrace protections
|
|
"kernel.yama.ptrace_scope" = mkOverride 500 "1";
|
|
|
|
# set perf only available to root
|
|
"kernel.perf_event_paranoid" = mkDefault "2";
|
|
|
|
};
|
|
|
|
}
|