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diff --git a/Biz/Cloud/chat.nix b/Biz/Cloud/chat.nix
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+{ config, pkgs, ... }:
+#
+# a homeserver for matrix.org.
+#
+# - nixos manual: https://nixos.org/nixos/manual/index.html#module-services-matrix
+#
+# to create new users:
+#
+#     nix run nixpkgs.matrix-synapse
+#     register_new_matrix_user -k <registration_shared_secret> http://localhost:<matrix_port>
+#
+let
+  fqdn = "matrix.${config.networking.domain}";
+  riot = "chat.${config.networking.domain}";
+  matrix_port = 8448;
+in {
+  # matrix-synapse server. for what the settings mean, see:
+  # https://nixos.org/nixos/manual/index.html#module-services-matrix
+  #
+  services.matrix-synapse = {
+    enable = true;
+    server_name = config.networking.domain;
+    registration_shared_secret = "AkGRWSQLga3RoKRFnHhKoeCEIeZzu31y4TRzMRkMyRbBnETkVTSxilf24qySLzQn";
+    listeners = [
+      {
+        port = matrix_port;
+        bind_address = "::1";
+        type = "http";
+        tls = false;
+        x_forwarded = true;
+        resources = [
+          {
+            names = [ "client" "federation" ];
+            compress = false;
+          }
+        ];
+      }
+    ];
+  };
+  # matrix needs a database
+  #
+  services.postgresql.enable = true;
+  # web proxy for the matrix server
+  #
+  services.nginx = {
+    enable = true;
+    recommendedTlsSettings = true;
+    recommendedOptimisation = true;
+    recommendedGzipSettings = true;
+    recommendedProxySettings = true;
+    virtualHosts = {
+      # route to matrix-synapse
+      "${config.networking.domain}" = {
+        locations."= /.well-known/matrix/server".extraConfig =
+          let
+            server = { "m.server" = "${fqdn}:443"; };
+          in ''
+            add_header Content-Type application/json;
+            return 200 '${builtins.toJSON server}';
+          '';
+        locations."= /.well-known/matrix/client".extraConfig =
+          let
+            client = {
+              "m.homeserver" = { "base_url" = "https://${fqdn}"; } ;
+              "m.identity_server" = { "base_url" = "https://vector.im"; };
+            };
+          in ''
+            add_header Content-Type application/json;
+            add_header Access-Control-Allow-Origin *;
+            return 200 '${builtins.toJSON client}';
+          '';
+      };
+      # reverse proxy for matrix client-server and server-server communication
+      "${fqdn}" = {
+        enableACME = true;
+        forceSSL = true;
+        locations."/".extraConfig = ''
+          return 404;
+        '';
+        locations."/_matrix" = {
+          proxyPass = "http://[::1]:${toString matrix_port}";
+        };
+      };
+    };
+  };
+  # riot client, available at chat.simatime.com
+  #
+  # note that riot and matrix-synapse must be on separate fqdn's to
+  # protect from XSS attacks:
+  # https://github.com/vector-im/riot-web#important-security-note
+  #
+  services.nginx.virtualHosts."${riot}" = {
+    enableACME = true;
+    forceSSL = true;
+    serverAliases = [
+      "chat.${config.networking.domain}"
+    ];
+    root = pkgs.riot-web;
+  };
+}