constant USER_LOGIN_EMAIL_ONLY

user_login in modules/user/user.module

Form builder; the main user login form.

user_login_authenticate_validate in modules/user/user.module

Second phase validation handler on the login form.

user_login_block in modules/user/user.module

user_login_final_validate in modules/user/user.module

The final validation handler on the login form.

user_login_name_validate in modules/user/user.module

First phase validation handler for the login form.

... See full list