From 08b81051969e0b0e03dd240bd3c83e42e2619521 Mon Sep 17 00:00:00 2001 From: magenbluten Date: Sun, 14 Jul 2019 13:05:51 +0200 Subject: mb: add rofl.r --- mb/2configs/google-compute-config.nix | 231 ++++++++++++++++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 mb/2configs/google-compute-config.nix (limited to 'mb/2configs/google-compute-config.nix') diff --git a/mb/2configs/google-compute-config.nix b/mb/2configs/google-compute-config.nix new file mode 100644 index 00000000..b201bd4b --- /dev/null +++ b/mb/2configs/google-compute-config.nix @@ -0,0 +1,231 @@ +{ config, lib, pkgs, ... }: +with lib; +let + gce = pkgs.google-compute-engine; +in +{ + imports = [ + ./headless.nix + ./qemu-guest.nix + ]; + + fileSystems."/" = { + 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"; + }; +} -- cgit v1.2.3