def get_allowed_auths(self, username):
return '<STR_LIT:password>'<EOL>
Return a list of authentication methods supported by the server.
This list is sent to clients attempting to authenticate, to inform them
of authentication methods that might be successful.

The "list" is actually a string of comma-separated names of types of
authentication.  Possible values are C{"password"}, C{"publickey"},
and C{"none"}.

The default implementation always returns C{"password"}.

@param username: the username requesting authentication.
@type username: str
@return: a comma-separated list of authentication types
@rtype: str