MS CRM 2013 - Way to implement Authentication/ Authorization in custom web page

Hi All,

I ma working on MS CRM 2013. I requirement is to implement custom page which will do some CRUD operation in MS CRM. I want to know way to implement Authentication/ Authorization in custom web page (aspx). It should be on user role based (Security role based).

Please suggest me correct and easiest way to do the same.

Thanks in Advance.