From 7ed022bc9a3c89834016c866e387b60ba4523eb6 Mon Sep 17 00:00:00 2001
From: Azat Bahawi <azat@bahawi.net>
Date: Tue, 14 Feb 2023 23:04:05 +0300
Subject: 2023-02-14

---
 modules/nixos/matrix/dendrite.nix | 193 +++++++++++++++++++++++---------------
 1 file changed, 119 insertions(+), 74 deletions(-)

(limited to 'modules/nixos/matrix')

diff --git a/modules/nixos/matrix/dendrite.nix b/modules/nixos/matrix/dendrite.nix
index 0fad5f2..6b662b2 100644
--- a/modules/nixos/matrix/dendrite.nix
+++ b/modules/nixos/matrix/dendrite.nix
@@ -11,6 +11,12 @@ in {
   options.nixfiles.modules.matrix.dendrite = {
     enable = mkEnableOption "Dendrite Matrix server";
 
+    port = mkOption {
+      description = "Port.";
+      type = with types; port;
+      default = 8008;
+    };
+
     domain = mkOption {
       type = types.str;
       default = config.networking.domain;
@@ -68,90 +74,129 @@ in {
         };
       };
 
-      services = {
-        dendrite = {
-          enable = true;
-          httpPort = 8008;
-          environmentFile = config.secrets.dendrite-environment-file.path;
-          settings = {
-            version = 2;
-            global = {
-              server_name = cfg.domain;
-              private_key = config.secrets.dendrite-private-key.path;
-              database = {
-                connection_string = "postgresql://${db}@/${db}?host=/run/postgresql";
-                max_open_conns = 64;
-                max_idle_connections = 8;
+      services.postgresql = {
+        ensureDatabases = [db];
+        ensureUsers = [
+          {
+            name = db;
+            ensurePermissions."DATABASE \"${db}\"" = "ALL";
+          }
+        ];
+      };
+
+      systemd.services.dendrite = {
+        description = "Dendrite Matrix homeserver";
+        requires = ["network.target"];
+        wantedBy = ["multi-user.target"];
+        serviceConfig = let
+          needsPrivileges = cfg.port < 1024;
+          capabilities = [""] ++ optionals needsPrivileges ["CAP_NET_BIND_SERVICE"];
+        in {
+          Restart = "on-failure";
+          ExecStartPre = let
+            settings = {
+              version = 2;
+              global = {
+                server_name = cfg.domain;
+                private_key = config.secrets.dendrite-private-key.path;
+                database = {
+                  connection_string = "postgresql://${db}@/${db}?host=/run/postgresql";
+                  max_open_conns = 64;
+                  max_idle_connections = 8;
+                };
+                cache = {
+                  max_size_estimated = "1gb";
+                  max_age = "1h";
+                };
+                trusted_third_party_id_servers = [
+                  "matrix.org"
+                  "nixos.org"
+                  "vector.im"
+                ];
+                presence = {
+                  enable_inbound = false;
+                  enable_outbound = false;
+                };
               };
-              cache = {
-                max_size_estimated = "1gb";
-                max_age = "1h";
+              client_api = {
+                registration_disabled = true;
+                guests_disabled = true;
+                registration_shared_secret = "$REGISTRATION_SHARED_SECRET";
               };
-              trusted_third_party_id_servers = [
-                "matrix.org"
-                "nixos.org"
-                "vector.im"
-              ];
-              presence = {
-                enable_inbound = false;
-                enable_outbound = false;
+              media_api = {
+                base_path = "/var/lib/dendrite/media_store";
+                max_file_size_bytes = 0;
+                dynamic_thumbnails = true;
+                max_thumbnail_generators = 8;
+                thumbnail_sizes = [
+                  {
+                    width = 32;
+                    height = 32;
+                    method = "crop";
+                  }
+                  {
+                    width = 96;
+                    height = 96;
+                    method = "crop";
+                  }
+                  {
+                    width = 640;
+                    height = 480;
+                    method = "scale";
+                  }
+                ];
               };
-            };
-            client_api = {
-              registration_disabled = true;
-              guests_disabled = true;
-              registration_shared_secret = "$REGISTRATION_SHARED_SECRET";
-            };
-            media_api = {
-              max_file_size_bytes = 0;
-              dynamic_thumbnails = true;
-              max_thumbnail_generators = 8;
-              thumbnail_sizes = [
+              logging = [
                 {
-                  width = 32;
-                  height = 32;
-                  method = "crop";
-                }
-                {
-                  width = 96;
-                  height = 96;
-                  method = "crop";
-                }
-                {
-                  width = 640;
-                  height = 480;
-                  method = "scale";
+                  type = "std";
+                  level = "warn";
                 }
               ];
             };
-            logging = [
-              {
-                type = "std";
-                level = "warn";
-              }
+          in
+            concatStringsSep " " [
+              "${pkgs.envsubst}/bin/envsubst"
+              "-i ${(pkgs.formats.yaml {}).generate "dendrite.yaml" settings}"
+              "-o /run/dendrite/dendrite.yaml"
             ];
-          };
-        };
-
-        postgresql = {
-          ensureDatabases = [db];
-          ensureUsers = [
-            {
-              name = db;
-              ensurePermissions."DATABASE \"${db}\"" = "ALL";
-            }
+          ExecStart = concatStringsSep " " [
+            "${pkgs.dendrite}/bin/dendrite-monolith-server"
+            "--config /run/dendrite/dendrite.yaml"
+            "--http-bind-address 127.0.0.1:${toString cfg.port}"
           ];
+          ExecReload = "${pkgs.coreutils}/bin/kill -HUP $MAINPID";
+          EnvironmentFile = config.secrets.dendrite-environment-file.path;
+          DynamicUser = true;
+          StateDirectory = "dendrite";
+          RuntimeDirectory = "dendrite";
+          RuntimeDirectoryMode = "0700";
+          AmbientCapabilities = capabilities;
+          CapabilityBoundingSet = capabilities;
+          UMask = "0077";
+          LockPersonality = true;
+          MemoryDenyWriteExecute = true;
+          NoNewPrivileges = true;
+          PrivateDevices = true;
+          PrivateTmp = true;
+          PrivateUsers = !needsPrivileges;
+          ProtectClock = true;
+          ProtectControlGroups = true;
+          ProtectHome = true;
+          ProtectHostname = true;
+          ProtectKernelLogs = true;
+          ProtectKernelModules = true;
+          ProtectKernelTunables = true;
+          ProtectSystem = "strict";
+          ProtectProc = "noaccess";
+          ProcSubset = "pid";
+          RemoveIPC = true;
+          RestrictAddressFamilies = ["AF_UNIX" "AF_INET" "AF_INET6"];
+          RestrictNamespaces = true;
+          RestrictRealtime = true;
+          RestrictSUIDSGID = true;
+          SystemCallArchitectures = "native";
+          SystemCallFilter = ["@system-service" "~@privileged"];
         };
       };
-
-      systemd.services.dendrite.serviceConfig.ExecStart =
-        mkForce
-        (concatStringsSep " " [
-          "${pkgs.dendrite}/bin/dendrite-monolith-server"
-          "--config /run/dendrite/dendrite.yaml"
-          "--http-bind-address 127.0.0.1:${
-            toString config.services.dendrite.httpPort
-          }"
-        ]);
     };
 }
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