diff --git a/certweb/auth.py b/certweb/auth.py
index e5aa99d..aa8b06b 100644
--- a/certweb/auth.py
+++ b/certweb/auth.py
@@ -104,6 +104,29 @@ def login():
             return redirect(url_for('pubkeys.index'))
 
         flash(error)
+    elif request.method == 'GET':
+        print(request.headers.get('X-AUTHENTICATION-id'))
+        #print(dict(request.headers))
+        db = get_db()
+        error = None
+
+        if request.headers.get('X-AUTHENTICATION-id') is not None:
+            username = request.headers.get('X-AUTHENTICATION-id')
+
+            user = db.execute(
+                'SELECT * FROM user WHERE username = ?', (username,)
+            ).fetchone()
+
+            if user is None:
+                error = 'Incorrect username.'
+                return redirect(url_for('auth.register'))
+
+            if error is None:
+                session.clear()
+                session['user_id'] = user['id']
+                return redirect(url_for('pubkeys.index'))
+        else:
+            return redirect(url_for('auth.register'))
 
     return render_template('auth/login.html')