diff options
Diffstat (limited to 'mb')
| -rw-r--r-- | mb/1systems/rofl/configuration.nix | 103 | ||||
| -rw-r--r-- | mb/2configs/google-compute-config.nix | 231 | ||||
| -rw-r--r-- | mb/2configs/headless.nix | 25 | ||||
| -rw-r--r-- | mb/2configs/qemu-guest.nix | 19 |
4 files changed, 378 insertions, 0 deletions
diff --git a/mb/1systems/rofl/configuration.nix b/mb/1systems/rofl/configuration.nix new file mode 100644 index 000000000..3c5c56c84 --- /dev/null +++ b/mb/1systems/rofl/configuration.nix @@ -0,0 +1,103 @@ +{ config, pkgs, callPackage, ... }: let + unstable = import <nixpkgs-unstable> { config = { allowUnfree = true; }; }; +in { + imports = + [ # Include the results of the hardware scan. + <stockholm/mb/2configs/google-compute-config.nix> + <stockholm/mb> + ]; + + krebs.build.host = config.krebs.hosts.rofl; + + i18n = { + consoleFont = "Lat2-Terminus16"; + consoleKeyMap = "de"; + defaultLocale = "en_US.UTF-8"; + }; + + time.timeZone = "Europe/Berlin"; + + nixpkgs.config.allowUnfree = true; + + environment.shellAliases = { + ll = "ls -alh"; + ls = "ls --color=tty"; + }; + + environment.systemPackages = with pkgs; [ + curl + fish + git + htop + nmap + ranger + tcpdump + tmux + traceroute + tree + vim + xz + zbackup + ]; + + sound.enable = false; + + services.openssh.enable = true; + services.openssh.passwordAuthentication = false; + + networking.wireless.enable = false; + networking.networkmanager.enable = false; + krebs.iptables.enable = true; + networking.enableIPv6 = false; + + programs.fish = { + enable = true; + shellInit = '' + function ssh_agent --description 'launch the ssh-agent and add the id_rsa identity' + if begin + set -q SSH_AGENT_PID + and kill -0 $SSH_AGENT_PID + and grep -q '^ssh-agent' /proc/$SSH_AGENT_PID/cmdline + end + echo "ssh-agent running on pid $SSH_AGENT_PID" + else + eval (command ssh-agent -c | sed 's/^setenv/set -Ux/') + end + set -l identity $HOME/.ssh/id_rsa + set -l fingerprint (ssh-keygen -lf $identity | awk '{print $2}') + ssh-add -l | grep -q $fingerprint + or ssh-add $identity + end + ''; + promptInit = '' + function fish_prompt --description 'Write out the prompt' + set -l color_cwd + set -l suffix + set -l nix_shell_info ( + if test "$IN_NIX_SHELL" != "" + echo -n " <nix-shell>" + end + ) + switch "$USER" + case root toor + if set -q fish_color_cwd_root + set color_cwd $fish_color_cwd_root + else + set color_cwd $fish_color_cwd + end + set suffix '#' + case '*' + set color_cwd $fish_color_cwd + set suffix '>' + end + + echo -n -s "$USER" @ (set_color green) (prompt_hostname) (set_color normal) "$nix_shell_info" ' ' (set_color $color_cwd) (prompt_pwd) (set_color normal) "$suffix " + end + ''; + }; + + system.autoUpgrade.enable = false; + system.autoUpgrade.channel = "https://nixos.org/channels/nixos-19.03"; + system.stateVersion = "19.03"; + +} diff --git a/mb/2configs/google-compute-config.nix b/mb/2configs/google-compute-config.nix new file mode 100644 index 000000000..b201bd4b8 --- /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"; + }; +} diff --git a/mb/2configs/headless.nix b/mb/2configs/headless.nix new file mode 100644 index 000000000..46a9b6a7d --- /dev/null +++ b/mb/2configs/headless.nix @@ -0,0 +1,25 @@ +# Common configuration for headless machines (e.g., Amazon EC2 +# instances). + +{ lib, ... }: + +with lib; + +{ + boot.vesa = false; + + # Don't start a tty on the serial consoles. + systemd.services."serial-getty@ttyS0".enable = false; + systemd.services."serial-getty@hvc0".enable = false; + systemd.services."getty@tty1".enable = false; + systemd.services."autovt@".enable = false; + + # Since we can't manually respond to a panic, just reboot. + boot.kernelParams = [ "panic=1" "boot.panic_on_fail" ]; + + # Don't allow emergency mode, because we don't have a console. + systemd.enableEmergencyMode = false; + + # Being headless, we don't need a GRUB splash image. + boot.loader.grub.splashImage = null; +} diff --git a/mb/2configs/qemu-guest.nix b/mb/2configs/qemu-guest.nix new file mode 100644 index 000000000..315d04093 --- /dev/null +++ b/mb/2configs/qemu-guest.nix @@ -0,0 +1,19 @@ +# Common configuration for virtual machines running under QEMU (using +# virtio). + +{ ... }: + +{ + boot.initrd.availableKernelModules = [ "virtio_net" "virtio_pci" "virtio_mmio" "virtio_blk" "virtio_scsi" "9p" "9pnet_virtio" ]; + boot.initrd.kernelModules = [ "virtio_balloon" "virtio_console" "virtio_rng" ]; + + boot.initrd.postDeviceCommands = + '' + # Set the system time from the hardware clock to work around a + # bug in qemu-kvm > 1.5.2 (where the VM clock is initialised + # to the *boot time* of the host). + hwclock -s + ''; + + security.rngd.enable = false; +} |