320 lines
11 KiB
Nix
320 lines
11 KiB
Nix
{ config, pkgs, lib, ... }:
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with lib;
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let
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cfg = config.services.paperless;
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defaultUser = "paperless";
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# Don't start a redis instance if the user sets a custom redis connection
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enableRedis = !hasAttr "PAPERLESS_REDIS" cfg.extraConfig;
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redisServer = config.services.redis.servers.paperless;
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env = {
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PAPERLESS_DATA_DIR = cfg.dataDir;
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PAPERLESS_MEDIA_ROOT = cfg.mediaDir;
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PAPERLESS_CONSUMPTION_DIR = cfg.consumptionDir;
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GUNICORN_CMD_ARGS = "--bind=${cfg.address}:${toString cfg.port}";
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} // (
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lib.mapAttrs (_: toString) cfg.extraConfig
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) // (optionalAttrs enableRedis {
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PAPERLESS_REDIS = "unix://${redisServer.unixSocket}";
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});
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manage = let
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setupEnv = lib.concatStringsSep "\n" (mapAttrsToList (name: val: "export ${name}=\"${val}\"") env);
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in pkgs.writeShellScript "manage" ''
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${setupEnv}
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exec ${cfg.package}/bin/paperless-ngx "$@"
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'';
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# Secure the services
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defaultServiceConfig = {
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TemporaryFileSystem = "/:ro";
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BindReadOnlyPaths = [
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"/nix/store"
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"-/etc/resolv.conf"
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"-/etc/nsswitch.conf"
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"-/etc/hosts"
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"-/etc/localtime"
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"-/run/postgresql"
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] ++ (optional enableRedis redisServer.unixSocket);
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BindPaths = [
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cfg.consumptionDir
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cfg.dataDir
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cfg.mediaDir
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];
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CapabilityBoundingSet = "";
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# ProtectClock adds DeviceAllow=char-rtc r
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DeviceAllow = "";
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LockPersonality = true;
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MemoryDenyWriteExecute = true;
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NoNewPrivileges = true;
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PrivateDevices = true;
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PrivateMounts = true;
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PrivateNetwork = true;
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PrivateTmp = true;
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PrivateUsers = true;
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ProtectClock = true;
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# Breaks if the home dir of the user is in /home
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# Also does not add much value in combination with the TemporaryFileSystem.
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# ProtectHome = true;
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ProtectHostname = true;
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# Would re-mount paths ignored by temporary root
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#ProtectSystem = "strict";
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ProtectControlGroups = true;
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ProtectKernelLogs = true;
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ProtectKernelModules = true;
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ProtectKernelTunables = true;
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ProtectProc = "invisible";
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# Don't restrict ProcSubset because django-q requires read access to /proc/stat
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# to query CPU and memory information.
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# Note that /proc only contains processes of user `paperless`, so this is safe.
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# ProcSubset = "pid";
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RestrictAddressFamilies = [ "AF_UNIX" "AF_INET" "AF_INET6" ];
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RestrictNamespaces = true;
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RestrictRealtime = true;
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RestrictSUIDSGID = true;
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SupplementaryGroups = optional enableRedis redisServer.user;
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SystemCallArchitectures = "native";
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SystemCallFilter = [ "@system-service" "~@privileged @resources @setuid @keyring" ];
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# Does not work well with the temporary root
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#UMask = "0066";
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};
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in
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{
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meta.maintainers = with maintainers; [ erikarvstedt Flakebi ];
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imports = [
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(mkRenamedOptionModule [ "services" "paperless-ng" ] [ "services" "paperless" ])
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];
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options.services.paperless = {
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enable = mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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Enable Paperless.
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When started, the Paperless database is automatically created if it doesn't
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exist and updated if the Paperless package has changed.
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Both tasks are achieved by running a Django migration.
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A script to manage the Paperless instance (by wrapping Django's manage.py) is linked to
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`''${dataDir}/paperless-manage`.
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'';
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};
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dataDir = mkOption {
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type = types.str;
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default = "/var/lib/paperless";
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description = lib.mdDoc "Directory to store the Paperless data.";
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};
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mediaDir = mkOption {
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type = types.str;
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default = "${cfg.dataDir}/media";
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defaultText = literalExpression ''"''${dataDir}/media"'';
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description = lib.mdDoc "Directory to store the Paperless documents.";
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};
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consumptionDir = mkOption {
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type = types.str;
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default = "${cfg.dataDir}/consume";
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defaultText = literalExpression ''"''${dataDir}/consume"'';
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description = lib.mdDoc "Directory from which new documents are imported.";
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};
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consumptionDirIsPublic = mkOption {
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type = types.bool;
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default = false;
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description = lib.mdDoc "Whether all users can write to the consumption dir.";
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};
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passwordFile = mkOption {
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type = types.nullOr types.path;
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default = null;
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example = "/run/keys/paperless-password";
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description = lib.mdDoc ''
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A file containing the superuser password.
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A superuser is required to access the web interface.
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If unset, you can create a superuser manually by running
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`''${dataDir}/paperless-manage createsuperuser`.
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The default superuser name is `admin`. To change it, set
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option {option}`extraConfig.PAPERLESS_ADMIN_USER`.
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WARNING: When changing the superuser name after the initial setup, the old superuser
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will continue to exist.
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To disable login for the web interface, set the following:
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`extraConfig.PAPERLESS_AUTO_LOGIN_USERNAME = "admin";`.
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WARNING: Only use this on a trusted system without internet access to Paperless.
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'';
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};
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address = mkOption {
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type = types.str;
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default = "localhost";
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description = lib.mdDoc "Web interface address.";
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};
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port = mkOption {
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type = types.port;
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default = 28981;
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description = lib.mdDoc "Web interface port.";
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};
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extraConfig = mkOption {
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type = types.attrs;
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default = {};
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description = lib.mdDoc ''
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Extra paperless config options.
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See [the documentation](https://paperless-ngx.readthedocs.io/en/latest/configuration.html)
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for available options.
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'';
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example = literalExpression ''
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{
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PAPERLESS_OCR_LANGUAGE = "deu+eng";
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}
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'';
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};
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user = mkOption {
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type = types.str;
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default = defaultUser;
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description = lib.mdDoc "User under which Paperless runs.";
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};
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package = mkOption {
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type = types.package;
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default = pkgs.paperless-ngx;
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defaultText = literalExpression "pkgs.paperless-ngx";
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description = lib.mdDoc "The Paperless package to use.";
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};
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};
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config = mkIf cfg.enable {
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services.redis.servers.paperless.enable = mkIf enableRedis true;
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systemd.tmpfiles.rules = [
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"d '${cfg.dataDir}' - ${cfg.user} ${config.users.users.${cfg.user}.group} - -"
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"d '${cfg.mediaDir}' - ${cfg.user} ${config.users.users.${cfg.user}.group} - -"
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(if cfg.consumptionDirIsPublic then
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"d '${cfg.consumptionDir}' 777 - - - -"
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else
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"d '${cfg.consumptionDir}' - ${cfg.user} ${config.users.users.${cfg.user}.group} - -"
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)
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];
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systemd.services.paperless-scheduler = {
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description = "Paperless scheduler";
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serviceConfig = defaultServiceConfig // {
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User = cfg.user;
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ExecStart = "${cfg.package}/bin/paperless-ngx qcluster";
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Restart = "on-failure";
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# The `mbind` syscall is needed for running the classifier.
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SystemCallFilter = defaultServiceConfig.SystemCallFilter ++ [ "mbind" ];
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# Needs to talk to mail server for automated import rules
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PrivateNetwork = false;
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};
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environment = env;
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wantedBy = [ "multi-user.target" ];
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wants = [ "paperless-consumer.service" "paperless-web.service" ];
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preStart = ''
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ln -sf ${manage} ${cfg.dataDir}/paperless-manage
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# Auto-migrate on first run or if the package has changed
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versionFile="${cfg.dataDir}/src-version"
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if [[ $(cat "$versionFile" 2>/dev/null) != ${cfg.package} ]]; then
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${cfg.package}/bin/paperless-ngx migrate
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echo ${cfg.package} > "$versionFile"
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fi
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''
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+ optionalString (cfg.passwordFile != null) ''
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export PAPERLESS_ADMIN_USER="''${PAPERLESS_ADMIN_USER:-admin}"
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export PAPERLESS_ADMIN_PASSWORD=$(cat "${cfg.dataDir}/superuser-password")
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superuserState="$PAPERLESS_ADMIN_USER:$PAPERLESS_ADMIN_PASSWORD"
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superuserStateFile="${cfg.dataDir}/superuser-state"
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if [[ $(cat "$superuserStateFile" 2>/dev/null) != $superuserState ]]; then
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${cfg.package}/bin/paperless-ngx manage_superuser
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echo "$superuserState" > "$superuserStateFile"
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fi
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'';
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} // optionalAttrs enableRedis {
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after = [ "redis-paperless.service" ];
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};
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# Reading the user-provided password file requires root access
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systemd.services.paperless-copy-password = mkIf (cfg.passwordFile != null) {
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requiredBy = [ "paperless-scheduler.service" ];
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before = [ "paperless-scheduler.service" ];
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serviceConfig = {
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ExecStart = ''
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${pkgs.coreutils}/bin/install --mode 600 --owner '${cfg.user}' --compare \
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'${cfg.passwordFile}' '${cfg.dataDir}/superuser-password'
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'';
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Type = "oneshot";
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};
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};
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systemd.services.paperless-consumer = {
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description = "Paperless document consumer";
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serviceConfig = defaultServiceConfig // {
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User = cfg.user;
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ExecStart = "${cfg.package}/bin/paperless-ngx document_consumer";
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Restart = "on-failure";
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};
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environment = env;
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# Bind to `paperless-scheduler` so that the consumer never runs
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# during migrations
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bindsTo = [ "paperless-scheduler.service" ];
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after = [ "paperless-scheduler.service" ];
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};
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systemd.services.paperless-web = {
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description = "Paperless web server";
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serviceConfig = defaultServiceConfig // {
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User = cfg.user;
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ExecStart = ''
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${pkgs.python3Packages.gunicorn}/bin/gunicorn \
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-c ${cfg.package}/lib/paperless-ngx/gunicorn.conf.py paperless.asgi:application
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'';
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Restart = "on-failure";
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AmbientCapabilities = "CAP_NET_BIND_SERVICE";
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CapabilityBoundingSet = "CAP_NET_BIND_SERVICE";
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# gunicorn needs setuid
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SystemCallFilter = defaultServiceConfig.SystemCallFilter ++ [ "@setuid" ];
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# Needs to serve web page
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PrivateNetwork = false;
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};
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environment = env // {
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PATH = mkForce cfg.package.path;
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PYTHONPATH = "${cfg.package.pythonPath}:${cfg.package}/lib/paperless-ngx/src";
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};
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# Allow the web interface to access the private /tmp directory of the server.
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# This is required to support uploading files via the web interface.
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unitConfig.JoinsNamespaceOf = "paperless-scheduler.service";
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# Bind to `paperless-scheduler` so that the web server never runs
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# during migrations
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bindsTo = [ "paperless-scheduler.service" ];
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after = [ "paperless-scheduler.service" ];
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};
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users = optionalAttrs (cfg.user == defaultUser) {
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users.${defaultUser} = {
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group = defaultUser;
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uid = config.ids.uids.paperless;
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home = cfg.dataDir;
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};
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groups.${defaultUser} = {
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gid = config.ids.gids.paperless;
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};
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};
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};
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}
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