You can create a custom ajax action or add a custom parameter to your post request and catch it on init action callback.
In that ajax action/init callback you can use wp_signon function to check if the credentials are ok and return proper response.
I would write some code but I’m on mobile and would take too much.
You can see here an example made with ajax http://fellowtuts.com/wordpress/wordpress-ajax-login-and-register-without-a-plugin/
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