diff --git a/register b/register
index ac3ec17..e29c1ab 100755
--- a/register
+++ b/register
@@ -10,8 +10,16 @@ class S(BaseHTTPRequestHandler):
         data = loads(self.rfile.read(content_length).decode('utf-8'))
         data['password'] = os.popen('slappasswd -s ' + data['password']).read()[:-1]
         print(data)
-        if data['code'] != code:
+        
+        bad = False        
+        if data['code'] != code: bad = True
+        if not all(c.isdigit() or c.islower() for c in data['username']): bad = True
+        if not all(c.islower() or c.isupper() for c in data['firstname']): bad = True
+        if not all(c.islower() or c.isupper() for c in data['lastname']): bad = True
+        if not all(c.islower() or c.isupper() or c == '@' or c == '.' for c in data['email']): bad = True
+        if bad:
             return
+
         os.system('adduser ' + data['username'] + ' ' + data['firstname'] + ' ' + data['lastname'] + ' ' + data['email'] + ' ' + data['password'] + ' "' + ldap_pass + '"')
 
         self.send_response(200)