diff --git a/main.go b/main.go
index 0da35ab..842bb0b 100644
--- a/main.go
+++ b/main.go
@@ -48,6 +48,21 @@ func loadConfig() (err error) {
 
 	err = yaml.Unmarshal(configfile, &config)
 
+	// todo: check for bad data !!
+
+	var re = regexp.MustCompile(`(((ftp|http|https):\/\/)|(\/)|(..\/))(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?`)
+	tocheck := [2]string{config.Panel.Host, config.Auth.GiteaURL}
+
+	for _, val := range tocheck {
+		if len(re.FindStringIndex(val)) == 0 {
+			log.Fatalf(`"%s" is not a valid url.`, val)
+		}
+	}
+
+	if config.Panel.Port > 65535 {
+		log.Fatalf("port is too big (max 65535)")
+	}
+
 	// init oauth bits
 	redirecturi = fmt.Sprintf("%s/login/endpoint", config.Panel.Host)
 	requesturl = fmt.Sprintf("%s/login/oauth/authorize?client_id=%s&redirect_uri=%s&response_type=code&state=STATE",