The documentation says that there only one context variable, form
.
If you're having trouble with login (which is common), the documentation says there are three context variables:
form
: A Form object representing the login form. See the forms documentation for more on Form objects.next
: The URL to redirect to after successful login. This may contain a query string, too.site_name
: The name of the current Site, according to the SITE_ID setting.