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path: root/modules/nixfiles/vaultwarden.nix
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{
  config,
  inputs,
  lib,
  ...
}:
with lib; let
  cfg = config.nixfiles.modules.vaultwarden;
in {
  options.nixfiles.modules.vaultwarden = {
    enable = mkEnableOption "Whether to enable Vaultwarden.";

    domain = mkOption {
      description = "Domain name sans protocol scheme.";
      type = with types; str;
      default = "vaultwarden.${config.networking.domain}";
    };
  };

  config = mkIf cfg.enable {
    secrets.vaultwarden-environment = {
      file = "${inputs.self}/secrets/vaultwarden-environment";
      owner = "vaultwarden";
      group = "vaultwarden";
    };

    nixfiles.modules = {
      nginx = {
        enable = true;
        virtualHosts.${cfg.domain} = with config.services.vaultwarden.config; {
          locations."/" = {
            proxyPass = "http://[${ROCKET_ADDRESS}]:${toString ROCKET_PORT}";
            proxyWebsockets = true;
          };
          locations."/notifications/hub" = {
            proxyPass = "http://[${WEBSOCKET_ADDRESS}]:${toString WEBSOCKET_PORT}";
            proxyWebsockets = true;
          };
          locations."/notifications/hub/negotiate" = {
            proxyPass = "http://[${ROCKET_ADDRESS}]:${toString ROCKET_PORT}";
            proxyWebsockets = true;
          };
        };
      };
      postgresql.enable = true;
    };

    services = let
      db = "vaultwarden";
    in {
      vaultwarden = {
        enable = true;
        config = {
          TZ = config.time.timeZone;

          WEB_VAULT_ENABLED = true;

          DOMAIN = optionalString (cfg.domain != null) "http://${cfg.domain}";

          SIGNUPS_ALLOWED = false;
          INVITATIONS_ALLOWED = true;

          ROCKET_ADDRESS = "::1";
          ROCKET_PORT = 8812;

          WEBSOCKET_ENABLED = true;
          WEBSOCKET_ADDRESS = "::1";
          WEBSOCKET_PORT = 8813;

          LOG_LEVEL = "error";

          DATABASE_URL = "postgresql://${db}@/${db}";
        };
        dbBackend = "postgresql";
        environmentFile = config.secrets.vaultwarden-environment.path;
      };

      postgresql = {
        ensureDatabases = [db];
        ensureUsers = [
          {
            name = db;
            ensurePermissions."DATABASE \"${db}\"" = "ALL PRIVILEGES";
          }
        ];
      };

      fail2ban.jails = mkIf config.nixfiles.modules.fail2ban.enable {
        vaultwarden = ''
          enabled = true
          filter = vaultwarden
          port = http,https
        '';
        vaultwarden-admin = ''
          enabled = true
          filter = vaultwarden-admin
          port = http,https
        '';
      };
    };

    environment.etc = mkIf config.nixfiles.modules.fail2ban.enable {
      "fail2ban/filter.d/vaultwarden.conf".text = ''
        [Definition]
        failregex = ^.*Username or password is incorrect\. Try again\. IP: <ADDR>\. Username:.*$
        ignoreregex =
        journalmatch = _SYSTEMD_UNIT=vaultwarden.service
      '';
      "fail2ban/filter.d/vaultwarden-admin.conf".text = ''
        [Definition]
        failregex = ^.*Invalid admin token\. IP: <ADDR>.*$
        ignoreregex =
        journalmatch = _SYSTEMD_UNIT=vaultwarden.service
      '';
    };
  };
}