diff --git a/.gitignore b/.gitignore
index b146c66..9f63e5a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 hardware/__Previews
 *.log
 software/config.js
+software/node_modules
diff --git a/software/auth/cardAuth.js b/software/auth/cardAuth.js
index 7aa236d..e6e7e19 100644
--- a/software/auth/cardAuth.js
+++ b/software/auth/cardAuth.js
@@ -1,3 +1,32 @@
+var config = require("../config")
+var request = require("request")
+
 module.exports = function(fingerPrint, callback){
-	callback(null, null);
+	request.post({
+		url: config.accounts9 + "/interface/getUserByIdentity",
+		json: {
+			interfaceSecret: config.interfaceSecret,
+			identity: fingerPrint
+		},
+		strictSSL: true,
+	}, function(error, response, body){
+		if(error){
+			return callback(error);
+		}
+		if(body.error === 'no-such-user'){
+			return callback(null, null);
+		}else if(body.error){
+			return callback(body.error, null);
+		}else{
+			if(body.user.groups.some(function(g){
+				return config.acceptGroup.some(function(h){
+					return h === g;
+				});
+			})){
+				return callback(null, body.user.name);
+			}else{
+				return callback(null, null);
+			}
+		}
+	});
 }
\ No newline at end of file
diff --git a/software/config.example.js b/software/config.example.js
index 212f466..b580027 100644
--- a/software/config.example.js
+++ b/software/config.example.js
@@ -4,6 +4,7 @@
 	logFile    : "./access.log",
 	sockFile   : "/tmp/card9.sock",
 	accounts9  : "https://accounts.net9.org",
-  setUid      : "nobody",
+  setUid     : "", //should not be root; should have access to the source code
 	interfaceSecret : "Example",
+	acceptGroup: ["access-door"],
 };
\ No newline at end of file
diff --git a/software/package.json b/software/package.json
index b3d6222..fe5b821 100644
--- a/software/package.json
+++ b/software/package.json
@@ -6,5 +6,6 @@
     "start": "sudo node ./card9.js"
   },
   "dependencies": {
+    "request": "^2.53.0"
   }
 }
diff --git a/software/test.packet b/software/test.packet
index bbd11a5..ebf5906 100644
--- a/software/test.packet
+++ b/software/test.packet
Binary files differ