transport.py 文件源码

def load_server_moduli(filename=None):
        """
        (optional)
        Load a file of prime moduli for use in doing group-exchange key
        negotiation in server mode.  It's a rather obscure option and can be
        safely ignored.

        In server mode, the remote client may request "group-exchange" key
        negotiation, which asks the server to send a random prime number that
        fits certain criteria.  These primes are pretty difficult to compute,
        so they can't be generated on demand.  But many systems contain a file
        of suitable primes (usually named something like ``/etc/ssh/moduli``).
        If you call `load_server_moduli` and it returns ``True``, then this
        file of primes has been loaded and we will support "group-exchange" in
        server mode.  Otherwise server mode will just claim that it doesn't
        support that method of key negotiation.

        :param str filename:
            optional path to the moduli file, if you happen to know that it's
            not in a standard location.
        :return:
            True if a moduli file was successfully loaded; False otherwise.

        .. note:: This has no effect when used in client mode.
        """
        Transport._modulus_pack = ModulusPack()
        # places to look for the openssh "moduli" file
        file_list = ['/etc/ssh/moduli', '/usr/local/etc/moduli']
        if filename is not None:
            file_list.insert(0, filename)
        for fn in file_list:
            try:
                Transport._modulus_pack.read_file(fn)
                return True
            except IOError:
                pass
        # none succeeded
        Transport._modulus_pack = None
        return False