nginx: add nginx as a reverse proxy

This will ultimately replace traefik.

1 files changed, 80 insertions, 0 deletions

diff --git a/modules/services/nginx/sso/default.nix b/modules/services/nginx/sso/default.nix
new file mode 100644
index 0000000..27ed7d6
--- /dev/null
+++ b/modules/services/nginx/sso/default.nix
@@ -0,0 +1,80 @@
+# I must override the module to allow having runtime secrets
+{ config, lib, pkgs, utils, ... }:
+let
+  cfg = config.services.nginx.sso;
+  pkg = lib.getBin cfg.package;
+  confPath = "/var/lib/nginx-sso/config.json";
+in {
+  disabledModules = [ "services/security/nginx-sso.nix" ];
+  options.services.nginx.sso = with lib; {
+    enable = mkEnableOption "nginx-sso service";
+    package = mkOption {
+      type = types.package;
+      default = pkgs.nginx-sso;
+      defaultText = "pkgs.nginx-sso";
+      description = ''
+        The nginx-sso package that should be used.
+      '';
+    };
+    configuration = mkOption {
+      type = types.attrsOf types.unspecified;
+      default = { };
+      example = literalExample ''
+        {
+          listen = { addr = "127.0.0.1"; port = 8080; };
+          providers.token.tokens = {
+            myuser = "MyToken";
+          };
+          acl = {
+            rule_sets = [
+              {
+                rules = [ { field = "x-application"; equals = "MyApp"; } ];
+                allow = [ "myuser" ];
+              }
+            ];
+          };
+        }
+      '';
+      description = ''
+        nginx-sso configuration
+        (<link xlink:href="https://github.com/Luzifer/nginx-sso/wiki/Main-Configuration">documentation</link>)
+        as a Nix attribute set.
+      '';
+    };
+  };
+  config = lib.mkIf cfg.enable {
+    systemd.services.nginx-sso = {
+      description = "Nginx SSO Backend";
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      serviceConfig = {
+        StateDirectory = "nginx-sso";
+        WorkingDirectory = "/var/lib/nginx-sso";
+        # The files to be merged might not have the correct permissions
+        ExecStartPre = "+${
+            pkgs.writeScript "merge-nginx-sso-config" ''
+              #!${pkgs.bash}/bin/bash
+              rm -f '${confPath}'
+              ${utils.genJqSecretsReplacementSnippet cfg.configuration confPath}
+              # Fix permissions
+              chown nginx-sso:nginx-sso ${confPath}
+              chmod 0600 ${confPath}
+            ''
+          }";
+        ExecStart = lib.mkForce ''
+          ${pkg}/bin/nginx-sso \
+            --config ${confPath} \
+            --frontend-dir ${pkg}/share/frontend
+        '';
+        Restart = "always";
+        User = "nginx-sso";
+        Group = "nginx-sso";
+      };
+    };
+    users.users.nginx-sso = {
+      isSystemUser = true;
+      group = "nginx-sso";
+    };
+    users.groups.nginx-sso = { };
+  };
+}