nixos-config/machines/fuuko/services/paperless.nix

# SPDX-FileCopyrightText: 2021-2024 Simon Bruder <simon@sbruder.de>
#
# SPDX-License-Identifier: AGPL-3.0-or-later

{ config, lib, ... }:

{
  services.postgresql = {
    enable = true;
    ensureDatabases = [ "paperless" ];
    ensureUsers = lib.singleton {
      name = "paperless";
      ensureDBOwnership = true;
    };
  };

  services.paperless = {
    enable = true;
    settings = {
      PAPERLESS_DBHOST = "/run/postgresql";
      PAPERLESS_URL = "https://paperless.sbruder.de";
      PAPERLESS_OCR_LANGUAGE = "deu+eng";
      PAPERLESS_TASK_WORKERS = 4;
      PAPERLESS_TIME_ZONE = "Europe/Berlin";
      PAPERLESS_FILENAME_FORMAT = "{correspondent}/{document_type}/{created}_{title}_{doc_pk}";
      PAPERLESS_CONSUMER_RECURSIVE = true;
      PAPERLESS_OCR_USER_ARGS = builtins.toJSON {
        invalidate_digital_signatures = true;
      };
    };
  };

  systemd.services.paperless-task-queue.serviceConfig = {
    ReadWritePaths = [ "/var/lib/scans/paperless" ];
  };

  services.nginx = {
    enable = true;

    virtualHosts."paperless.sbruder.de" = {
      enableACME = true;
      forceSSL = true;

      locations = {
        "/" = {
          proxyPass = with config.services.paperless; "http://${address}:${toString port}";
          proxyWebsockets = true;
          extraConfig = ''
            client_max_body_size 500M;
          '';
        };
        "/static".root = "${config.services.paperless.package}/lib/paperless-ngx";
      };
    };

    virtualHosts."fuuko.lan.shinonome-lab.de" = {
      enableACME = true;
      forceSSL = true;
    };
  };

  users.users.scan = {
    home = "/var/lib/scans";
    isSystemUser = true;
    group = "scan";
    hashedPassword = "$y$jCT$5kP87kZLYQs4SRtB5oDYT0$TbcyiO.HuFZ.5e9LPu4vqGAjGXbmfOTJefPvTlsVzm3";
  };
  users.groups.scan = { };

  systemd.tmpfiles.rules = [
    "d /var/lib/scans 0555 scan root -"
    "d /var/lib/scans/paperless 0775 scan paperless -"
    "L /var/lib/paperless/consume/ftp - - - - /var/lib/scans/paperless"
  ];

  sbruder.restic.backups.system.extraExcludes = [ "/var/lib/scans" ];

  services.vsftpd = {
    enable = true;
    writeEnable = true;
    localUsers = true;
    chrootlocalUser = true;
    userlist = [ "scan" ];

    rsaCertFile = "${config.security.acme.certs."fuuko.lan.shinonome-lab.de".directory}/full.pem";
    forceLocalLoginsSSL = true;
    forceLocalDataSSL = true;
    ssl_tlsv1 = false; # only allow TLS 1.2+

    extraConfig = ''
      listen_ipv6=YES

      # user’s shell is nologin
      check_shell=NO

      # scans should be readable
      local_umask=022

      pasv_min_port=30000
      pasv_max_port=30009

      # generated 2024-09-22, Mozilla Guideline v5.7, adapted, OpenSSL 3.0.14, intermediate configuration
      # https://ssl-config.mozilla.org
      ssl_enable=YES
      ssl_ciphers=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-CHACHA20-POLY1305
    '';
  };

  networking.firewall = {
    allowedTCPPorts = [ 21 ];
    allowedTCPPortRanges = [{ from = 30000; to = 30009; }];
  };
}