nixos-config/config/services/rspamd.nix

{
  config,
  lib,
  pkgs,
  ...
}: {
  services = {
    # TODO: Antivirus

    rspamd = {
      enable = true;
      locals = {
        "dkim_signing.conf".text = ''
          domain {
            "darkkirb.de" {
              selector = "dkim";
              path = "${config.sops.secrets."services/rspamd/dkim/darkkirb.de".path}";
            }
            "miifox.net" {
              selector = "dkim";
              path = "${config.sops.secrets."services/rspamd/dkim/miifox.net".path}";
            }
            "chir.rs" {
              selector = "dkim";
              path = "${config.sops.secrets."services/rspamd/dkim/chir.rs".path}";
            }
          }
        '';
        "dmarc.conf".text = ''
          actions {
            reject = "reject";
            quarantine = "quarantine";
            softfail = "add_header";
          }
        '';
        "greylist.conf".text = ''
          greylist_min_score = 0;
        '';
        "hfilter.conf".text = ''
          helo_enabled = true;
          hostname_enabled = true;
          url_enabled = true;
          from_enabled = true;
          rcpt_enabled = true;
          mid_enabled = true;
        '';
        "history.conf".text = ''
          nrows = 1000;
          subject_privacy = true;
        '';
        "milter.conf".text = ''
          use = [
            "authentication-results"
            "fuzzy-hashes"
            "spam-header"
            "stat-signature"
            "x-rspamd-queue-id"
            "x-rspamd-result"
            "x-rspamd-server"
            "x-rspamd-bar"
            "x-spam-status"
          ];
        '';
        "mx_check.conf".text = ''
          enabled = true;
        '';
        "neural.conf".text = ''
          enabled = true;
          rules {
            LONG {
              train {
                max_trains = 5000;
                max_usages = 200;
                max_iterations = 25;
                learning_rate = 0.01;
              }
              symbol_spam = "NEURAL_SPAM_LONG";
              symbol_ham = "NEURAL_HAM_LONG";
              ann_expire = "365d";
            }
            SHORT {
              train {
                max_trains = 5000;
                max_usages = 2;
                max_iterations = 25;
                learning_rate = 0.01;
              }
              symbol_spam = "NEURAL_SPAM_SHORT";
              symbol_ham = "NEURAL_HAM_SHORT";
              ann_expire = "30d";
            }
          }
        '';
        "neural_group.conf".text = ''
          symbols {
            NEURAL_SPAM_LONG {
              weight = 3.0; # sample weight
              description = "Neural network spam (long)";
            }
            NEURAL_HAM_LONG {
              weight = -3.0; # sample weight
              description = "Neural network ham (long)";
            }
            NEURAL_SPAM_SHORT {
              weight = 2.0; # sample weight
              description = "Neural network spam (short)";
            }
            NEURAL_HAM_SHORT {
              weight = -1.0; # sample weight
              description = "Neural network ham (short)";
            }
          }
        '';
        "phishing.conf".text = ''
          openphish_enabled = true;
        '';
        "reputation.conf".text = ''
          rules {
            ip_reputation {
              selector.type = "ip";
              backend.type = "redis";
              symbol = "IP_REPUTATION";
            }
            spf_reputation {
              selector.type = "spf";
              backend.type = "redis";
              symbol = "SPF_REPUTATION";
            }
            dkim_reputation {
              selector.type = "dkim";
              backend.type = "redis";
              symbol = "DKIM_REPUTATION";
            }
            asn_reputation {
              selector.type = "generic";
              selector.selector = "asn";
              backend.type = "redis";
              symbol = "ASN_REPUTATION";
            }
            country_reputation {
              selector.type = "generic";
              selector.selector = "country";
              backend.type = "redis";
              symbol = "COUNTRY_REPUTATION";
            }
          }
        '';
        "replies.conf".text = ''
          expire = "7d";
          symbol = "REPLY";
        '';
        "redis.conf".text = ''
          servers = "${config.services.redis.servers.rspamd.bind}:${toString config.services.redis.servers.rspamd.port}";
        '';
        "worker-controller.inc".text = ''
          password = "$2$xkox1hi3so3y61no8ps1enx7p56nh51s$tp8fjciao1goswpcze6g9bb9sbx3mf3kbik1iznybgia36d78jnb";
        '';
      };
      workers = {
        rspamd_proxy = {
          includes = ["$CONFDIR/worker-proxy.inc"];
          bindSockets = ["*:11332"];
        };
        normal = {
          includes = ["$CONFDIR/worker-normal.inc"];
          bindSockets = ["*:11333"];
        };
        controller = {
          includes = ["$CONFDIR/worker-controller.inc"];
          bindSockets = ["*:11334"];
        };
      };
    };
    redis.servers.rspamd = {
      enable = true;
      bind = "127.0.0.1";
      databases = 1;
      port = 6380;
      settings = {
        maxmemory = "500mb";
        maxmemory-policy = "volatile-ttl";
      };
    };
    caddy.virtualHosts."rspamd.int.chir.rs" = {
      useACMEHost = "int.chir.rs";
      logFormat = pkgs.lib.mkForce "";
      extraConfig = ''
        import baseConfig

        reverse_proxy http://127.0.0.1:11334
      '';
    };
  };
  sops.secrets."services/rspamd/dkim/darkkirb.de" = {owner = "rspamd";};
  sops.secrets."services/rspamd/dkim/miifox.net" = {owner = "rspamd";};
  sops.secrets."services/rspamd/dkim/chir.rs" = {owner = "rspamd";};
  services.prometheus.exporters.rspamd.enable = true;
}