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-rw-r--r--ops/machines/whitby/default.nix652
1 files changed, 652 insertions, 0 deletions
diff --git a/ops/machines/whitby/default.nix b/ops/machines/whitby/default.nix
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+++ b/ops/machines/whitby/default.nix
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+{ depot, lib, pkgs, ... }: # readTree options
+{ config, ... }: # passed by module system
+
+let
+  inherit (builtins) listToAttrs;
+  inherit (lib) range;
+in
+{
+  imports = [
+    "${depot.path}/ops/modules/atward.nix"
+    "${depot.path}/ops/modules/cgit/default.nix"
+    "${depot.path}/ops/modules/clbot.nix"
+    "${depot.path}/ops/modules/gerrit-queue.nix"
+    "${depot.path}/ops/modules/irccat.nix"
+    "${depot.path}/ops/modules/josh.nix"
+    "${depot.path}/ops/modules/journaldriver.nix"
+    "${depot.path}/ops/modules/known-hosts.nix"
+    "${depot.path}/ops/modules/monorepo-gerrit.nix"
+    "${depot.path}/ops/modules/nixery.nix"
+    "${depot.path}/ops/modules/oauth2_proxy.nix"
+    "${depot.path}/ops/modules/owothia.nix"
+    "${depot.path}/ops/modules/panettone.nix"
+    "${depot.path}/ops/modules/paroxysm.nix"
+    "${depot.path}/ops/modules/restic.nix"
+    "${depot.path}/ops/modules/smtprelay.nix"
+    "${depot.path}/ops/modules/sourcegraph.nix"
+    "${depot.path}/ops/modules/tvl-buildkite.nix"
+    "${depot.path}/ops/modules/tvl-slapd/default.nix"
+    "${depot.path}/ops/modules/tvl-users.nix"
+    "${depot.path}/ops/modules/www/atward.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/auth.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/b.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/cache.tvl.su.nix"
+    "${depot.path}/ops/modules/www/cl.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/code.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/cs.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/deploys.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/images.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/nixery.dev.nix"
+    "${depot.path}/ops/modules/www/self-redirect.nix"
+    "${depot.path}/ops/modules/www/static.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/status.tvl.su.nix"
+    "${depot.path}/ops/modules/www/tazj.in.nix"
+    "${depot.path}/ops/modules/www/todo.tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/tvl.fyi.nix"
+    "${depot.path}/ops/modules/www/tvl.su.nix"
+    "${depot.path}/ops/modules/www/wigglydonke.rs.nix"
+    "${depot.third_party.agenix.src}/modules/age.nix"
+    "${pkgs.path}/nixos/modules/services/web-apps/gerrit.nix"
+  ];
+
+  hardware = {
+    enableRedistributableFirmware = true;
+    cpu.amd.updateMicrocode = true;
+  };
+
+  boot = {
+    tmpOnTmpfs = true;
+    kernelModules = [ "kvm-amd" ];
+    supportedFilesystems = [ "zfs" ];
+
+    initrd = {
+      availableKernelModules = [
+        "igb"
+        "xhci_pci"
+        "nvme"
+        "ahci"
+        "usbhid"
+        "usb_storage"
+        "sr_mod"
+      ];
+
+      # Enable SSH in the initrd so that we can enter disk encryption
+      # passwords remotely.
+      network = {
+        enable = true;
+        ssh = {
+          enable = true;
+          port = 2222;
+          authorizedKeys =
+            depot.users.tazjin.keys.all
+            ++ depot.users.lukegb.keys.all
+            ++ [ depot.users.grfn.keys.whitby ];
+
+          hostKeys = [
+            /etc/secrets/initrd_host_ed25519_key
+          ];
+        };
+
+        # this will launch the zfs password prompt on login and kill the
+        # other prompt
+        postCommands = ''
+          echo "zfs load-key -a && killall zfs" >> /root/.profile
+        '';
+      };
+    };
+
+    kernel.sysctl = {
+      "net.ipv4.tcp_congestion_control" = "bbr";
+    };
+
+    loader.grub = {
+      enable = true;
+      version = 2;
+      efiSupport = true;
+      efiInstallAsRemovable = true;
+      device = "/dev/disk/by-id/nvme-SAMSUNG_MZQLB1T9HAJR-00007_S439NA0N201620";
+    };
+
+    zfs.requestEncryptionCredentials = true;
+  };
+
+  fileSystems = {
+    "/" = {
+      device = "zroot/root";
+      fsType = "zfs";
+    };
+
+    "/boot" = {
+      device = "/dev/disk/by-uuid/073E-7FBD";
+      fsType = "vfat";
+    };
+
+    "/nix" = {
+      device = "zroot/nix";
+      fsType = "zfs";
+    };
+
+    "/home" = {
+      device = "zroot/home";
+      fsType = "zfs";
+    };
+  };
+
+  networking = {
+    # Glass is boring, but Luke doesn't like Wapping - the Prospect of
+    # Whitby, however, is quite a pleasant establishment.
+    hostName = "whitby";
+    domain = "tvl.fyi";
+    hostId = "b38ca543";
+    useDHCP = false;
+
+    # Don't use Hetzner's DNS servers.
+    nameservers = [
+      "8.8.8.8"
+      "8.8.4.4"
+    ];
+
+    defaultGateway6 = {
+      address = "fe80::1";
+      interface = "enp196s0";
+    };
+
+    firewall.allowedTCPPorts = [ 22 80 443 4238 8443 29418 ];
+    firewall.allowedUDPPorts = [ 8443 ];
+
+    interfaces.enp196s0.useDHCP = true;
+    interfaces.enp196s0.ipv6.addresses = [
+      {
+        address = "2a01:04f8:0242:5b21::feed:edef:beef";
+        prefixLength = 64;
+      }
+    ];
+  };
+
+  # Generate an immutable /etc/resolv.conf from the nameserver settings
+  # above (otherwise DHCP overwrites it):
+  environment.etc."resolv.conf" = with lib; {
+    source = pkgs.writeText "resolv.conf" ''
+      ${concatStringsSep "\n" (map (ns: "nameserver ${ns}") config.networking.nameservers)}
+      options edns0
+    '';
+  };
+
+  # Disable background git gc system-wide, as it has a tendency to break CI.
+  environment.etc."gitconfig".source = pkgs.writeText "gitconfig" ''
+    [gc]
+    autoDetach = false
+  '';
+
+  time.timeZone = "UTC";
+
+  nix = {
+    nrBuildUsers = 256;
+    maxJobs = lib.mkDefault 64;
+    extraOptions = ''
+      secret-key-files = /run/agenix/nix-cache-priv
+    '';
+
+    trustedUsers = [
+      "grfn"
+      "lukegb"
+      "tazjin"
+      "sterni"
+    ];
+
+    sshServe = {
+      enable = true;
+      keys = with depot.users;
+        tazjin.keys.all
+        ++ lukegb.keys.all
+        ++ [ grfn.keys.whitby ]
+        ++ sterni.keys.all
+      ;
+    };
+  };
+
+  programs.mtr.enable = true;
+  programs.mosh.enable = true;
+  services.openssh = {
+    enable = true;
+    passwordAuthentication = false;
+    challengeResponseAuthentication = false;
+  };
+
+  # Configure secrets for services that need them.
+  age.secrets =
+    let
+      secretFile = name: depot.ops.secrets."${name}.age";
+    in
+    {
+      clbot.file = secretFile "clbot";
+      gerrit-queue.file = secretFile "gerrit-queue";
+      grafana.file = secretFile "grafana";
+      irccat.file = secretFile "irccat";
+      keycloak-db.file = secretFile "keycloak-db";
+      nix-cache-priv.file = secretFile "nix-cache-priv";
+      oauth2_proxy.file = secretFile "oauth2_proxy";
+      owothia.file = secretFile "owothia";
+      panettone.file = secretFile "panettone";
+      smtprelay.file = secretFile "smtprelay";
+
+      buildkite-agent-token = {
+        file = secretFile "buildkite-agent-token";
+        mode = "0440";
+        group = "buildkite-agents";
+      };
+
+      buildkite-graphql-token = {
+        file = secretFile "buildkite-graphql-token";
+        mode = "0440";
+        group = "buildkite-agents";
+      };
+
+      buildkite-besadii-config = {
+        file = secretFile "besadii";
+        mode = "0440";
+        group = "buildkite-agents";
+      };
+
+      gerrit-besadii-config = {
+        file = secretFile "besadii";
+        owner = "git";
+      };
+
+      gerrit-secrets = {
+        file = secretFile "gerrit-secrets";
+        path = "/var/lib/gerrit/etc/secure.config";
+        owner = "git";
+        mode = "0400";
+      };
+
+      clbot-ssh = {
+        file = secretFile "clbot-ssh";
+        owner = "clbot";
+      };
+
+      # Not actually a secret
+      nix-cache-pub = {
+        file = secretFile "nix-cache-pub";
+        mode = "0444";
+      };
+    };
+
+  # Automatically collect garbage from the Nix store.
+  services.depot.automatic-gc = {
+    enable = true;
+    interval = "1 hour";
+    diskThreshold = 200; # GiB
+    maxFreed = 420; # GiB
+    preserveGenerations = "90d";
+  };
+
+  # Run a handful of Buildkite agents to support parallel builds.
+  services.depot.buildkite = {
+    enable = true;
+    agentCount = 32;
+  };
+
+  # Start a local SMTP relay to Gmail (used by gerrit)
+  services.depot.smtprelay = {
+    enable = true;
+    args = {
+      listen = ":2525";
+      remote_host = "smtp.gmail.com:587";
+      remote_auth = "plain";
+      remote_user = "tvlbot@tazj.in";
+    };
+  };
+
+  # Start a ZNC instance which bounces for tvlbot and owothia.
+  services.znc = {
+    enable = true;
+    useLegacyConfig = false;
+    config = {
+      LoadModule = [
+        "webadmin"
+        "adminlog"
+      ];
+
+      User.admin = {
+        Admin = true;
+        Pass.password = {
+          Method = "sha256";
+          Hash = "bb00aa8239de484c2925b1c3f6a196fb7612633f001daa9b674f83abe7e1103f";
+          Salt = "TiB0Ochb1CrtpMTl;2;j";
+        };
+      };
+
+      Listener.l = {
+        Host = "localhost";
+        Port = 2627; # bncr
+        SSL = false;
+      };
+    };
+  };
+
+  # Start the Gerrit->IRC bot
+  services.depot.clbot = {
+    enable = true;
+    channels = [ "#tvl" ];
+
+    # See //fun/clbot for details.
+    flags = {
+      gerrit_host = "cl.tvl.fyi:29418";
+      gerrit_ssh_auth_username = "clbot";
+      gerrit_ssh_auth_key = "/run/agenix/clbot-ssh";
+
+      irc_server = "localhost:${toString config.services.znc.config.Listener.l.Port}";
+      irc_user = "tvlbot";
+      irc_nick = "tvlbot";
+
+      notify_branches = "canon,refs/meta/config";
+      notify_repo = "depot";
+
+      # This secret is read from an environment variable, which is
+      # populated by a systemd EnvironmentFile.
+      irc_pass = "$CLBOT_PASS";
+    };
+  };
+
+  services.depot = {
+    # Run a SourceGraph code search instance
+    sourcegraph.enable = true;
+
+    # Run the Panettone issue tracker
+    panettone = {
+      enable = true;
+      dbUser = "panettone";
+      dbName = "panettone";
+      irccatChannel = "#tvl";
+    };
+
+    # Run the first cursed bot (quote bot)
+    paroxysm.enable = true;
+
+    # Run the second cursed bot
+    owothia = {
+      enable = true;
+      ircServer = "localhost";
+      ircPort = config.services.znc.config.Listener.l.Port;
+    };
+
+    # Run irccat to forward messages to IRC
+    irccat = {
+      enable = true;
+      config = {
+        tcp.listen = ":4722"; # "ircc"
+        irc = {
+          server = "localhost:${toString config.services.znc.config.Listener.l.Port}";
+          tls = false;
+          nick = "tvlbot";
+          # Note: irccat means 'ident' where it says 'realname', so
+          # this is critical for connecting to ZNC.
+          realname = "tvlbot";
+          channels = [
+            "#tvl"
+          ];
+        };
+      };
+    };
+
+    # Run atward, the search engine redirection thing.
+    atward.enable = true;
+
+    # Run a Nixery instance
+    nixery.enable = true;
+
+    # Run cgit & josh to serve git
+    cgit.enable = true;
+    josh.enable = true;
+
+    # Configure backups to GleSYS
+    restic = {
+      enable = true;
+      paths = [
+        "/var/backup/postgresql"
+        "/var/lib/grafana"
+        "/var/lib/znc"
+      ];
+    };
+
+    # Run autosubmit bot for Gerrit
+    gerrit-queue.enable = true;
+
+    # Run oauth2_proxy for internal service auth
+    oauth2_proxy.enable = true;
+  };
+
+  services.postgresql = {
+    enable = true;
+    enableTCPIP = true;
+
+    authentication = lib.mkForce ''
+      local all all trust
+      host all all 127.0.0.1/32 password
+      host all all ::1/128 password
+      hostnossl all all 127.0.0.1/32 password
+      hostnossl all all ::1/128  password
+    '';
+
+    ensureDatabases = [
+      "panettone"
+    ];
+
+    ensureUsers = [{
+      name = "panettone";
+      ensurePermissions = {
+        "DATABASE panettone" = "ALL PRIVILEGES";
+      };
+    }];
+  };
+
+  services.postgresqlBackup = {
+    enable = true;
+    databases = [
+      "keycloak"
+      "panettone"
+      "tvldb"
+    ];
+  };
+
+  services.nix-serve = {
+    enable = true;
+    port = 6443;
+    secretKeyFile = "/run/agenix/nix-cache-priv";
+    bindAddress = "localhost";
+  };
+
+  services.fail2ban.enable = true;
+
+  environment.systemPackages = (with pkgs; [
+    bat
+    bb
+    curl
+    direnv
+    emacs-nox
+    fd
+    git
+    htop
+    hyperfine
+    jq
+    nano
+    nvd
+    ripgrep
+    tree
+    unzip
+    vim
+    zfs
+    zfstools
+  ]) ++ (with depot; [
+    ops.deploy-whitby
+  ]);
+
+  # Required for prometheus to be able to scrape stats
+  services.nginx.statusPage = true;
+
+  # Configure Prometheus & Grafana. Exporter configuration for
+  # Prometheus is inside the respective service modules.
+  services.prometheus = {
+    enable = true;
+    retentionTime = "90d";
+
+    exporters = {
+      node = {
+        enable = true;
+
+        enabledCollectors = [
+          "logind"
+          "processes"
+          "systemd"
+        ];
+      };
+
+      nginx = {
+        enable = true;
+        sslVerify = false;
+        constLabels = [ "host=whitby" ];
+      };
+    };
+
+    scrapeConfigs = [{
+      job_name = "node";
+      scrape_interval = "5s";
+      static_configs = [{
+        targets = [ "localhost:${toString config.services.prometheus.exporters.node.port}" ];
+      }];
+    }
+      {
+        job_name = "nginx";
+        scrape_interval = "5s";
+        static_configs = [{
+          targets = [ "localhost:${toString config.services.prometheus.exporters.nginx.port}" ];
+        }];
+      }];
+  };
+
+  services.grafana = {
+    enable = true;
+    port = 4723; # "graf" on phone keyboard
+    domain = "status.tvl.su";
+    rootUrl = "https://status.tvl.su";
+    analytics.reporting.enable = false;
+    extraOptions =
+      let
+        options = {
+          auth = {
+            generic_oauth = {
+              enabled = true;
+              client_id = "grafana";
+              scopes = "openid profile email";
+              name = "TVL";
+              email_attribute_path = "mail";
+              login_attribute_path = "sub";
+              name_attribute_path = "displayName";
+              auth_url = "https://auth.tvl.fyi/auth/realms/TVL/protocol/openid-connect/auth";
+              token_url = "https://auth.tvl.fyi/auth/realms/TVL/protocol/openid-connect/token";
+              api_url = "https://auth.tvl.fyi/auth/realms/TVL/protocol/openid-connect/userinfo";
+
+              # Give lukegb, grfn, tazjin "Admin" rights.
+              role_attribute_path = "((sub == 'lukegb' || sub == 'grfn' || sub == 'tazjin') && 'Admin') || 'Editor'";
+
+              # Allow creating new Grafana accounts from OAuth accounts.
+              allow_sign_up = true;
+            };
+
+            anonymous = {
+              enabled = true;
+              org_name = "The Virus Lounge";
+              org_role = "Viewer";
+            };
+
+            basic.enabled = false;
+            oauth_auto_login = true;
+            disable_login_form = true;
+          };
+        };
+        inherit (builtins) typeOf replaceStrings listToAttrs concatLists;
+        inherit (lib) toUpper mapAttrsToList nameValuePair concatStringsSep;
+
+        # Take ["auth" "generic_oauth" "enabled"] and turn it into OPTIONS_GENERIC_OAUTH_ENABLED.
+        encodeName = raw: replaceStrings [ "." ] [ "_" ] (toUpper (concatStringsSep "_" raw));
+
+        # Turn an option value into a string, but we want bools to be sensible strings and not "1" or "".
+        optionToString = value:
+          if (typeOf value) == "bool" then
+            if value then "true" else "false"
+          else builtins.toString value;
+
+        # Turn an nested options attrset into a flat listToAttrs-compatible list.
+        encodeOptions = prefix: inp: concatLists (mapAttrsToList
+          (name: value:
+            if (typeOf value) == "set"
+            then encodeOptions (prefix ++ [ name ]) value
+            else [ (nameValuePair (encodeName (prefix ++ [ name ])) (optionToString value)) ]
+          )
+          inp);
+      in
+      listToAttrs (encodeOptions [ ] options);
+
+    provision = {
+      enable = true;
+      datasources = [{
+        name = "Prometheus";
+        type = "prometheus";
+        url = "http://localhost:9090";
+      }];
+    };
+  };
+
+  # Contains GF_AUTH_GENERIC_OAUTH_CLIENT_SECRET.
+  systemd.services.grafana.serviceConfig.EnvironmentFile = "/run/agenix/grafana";
+
+  services.keycloak = {
+    enable = true;
+    httpPort = "5925"; # "kycl"
+    frontendUrl = "https://auth.tvl.fyi/auth/";
+
+    database = {
+      type = "postgresql";
+      passwordFile = "/run/agenix/keycloak-db";
+      createLocally = false;
+    };
+
+    # Configure Keycloak to look at forwarded headers from the reverse
+    # proxy.
+    extraConfig = {
+      "subsystem=undertow" = {
+        "server=default-server" = {
+          "http-listener=default" = {
+            proxy-address-forwarding = "true";
+          };
+        };
+      };
+    };
+  };
+
+  # Allow Keycloak access to the LDAP module by forcing in the JVM
+  # configuration
+  systemd.services.keycloak.environment.PREPEND_JAVA_OPTS =
+    "--add-exports=java.naming/com.sun.jndi.ldap=ALL-UNNAMED";
+
+  security.sudo.extraRules = [
+    {
+      groups = [ "wheel" ];
+      commands = [{ command = "ALL"; options = [ "NOPASSWD" ]; }];
+    }
+  ];
+
+  users = {
+    # Set up a user & group for git shenanigans
+    groups.git = { };
+    users.git = {
+      group = "git";
+      isSystemUser = true;
+      createHome = true;
+      home = "/var/lib/git";
+    };
+  };
+
+  system.stateVersion = "20.03";
+}