It sounds like Windows password features. Why not use them?

>I need to add login and password authentication routines to several legacy systems in the company where I work at.
>In other words, develop routines such like:
>- login-password validation
>- password expiration
>- failed password attemps
>- password history validation
>- minimum length control
>- etc.
>Get the idea?
>
>Since I don't want to invent the wheel again, does anyone know any library, routines or procedures with these functionalities that I can use or buy?
>
>Thanks for your help,
>
>Daniel