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Implementation of the ssh-userauth service.
Currently implemented authentication types are public-key and password.

Maintainer: Paul Swartz
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    A service implementing the server side of the 'ssh-userauth' service.  It
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    this server.

    @ivar name: the name of this service: 'ssh-userauth'
    @type name: L{bytes}
    @ivar authenticatedWith: a list of authentication methods that have
        already been used.
    @type authenticatedWith: L{list}
    @ivar loginTimeout: the number of seconds we wait before disconnecting
        the user for taking too long to authenticate
    @type loginTimeout: L{int}
    @ivar attemptsBeforeDisconnect: the number of failed login attempts we
        allow before disconnecting.
    @type attemptsBeforeDisconnect: L{int}
    @ivar loginAttempts: the number of login attempts that have been made
    @type loginAttempts: L{int}
    @ivar passwordDelay: the number of seconds to delay when the user gives
        an incorrect password
    @type passwordDelay: L{int}
    @ivar interfaceToMethod: a L{dict} mapping credential interfaces to
        authentication methods.  The server checks to see which of the
        cred interfaces have checkers and tells the client that those methods
        are valid for authentication.
    @type interfaceToMethod: L{dict}
    @ivar supportedAuthentications: A list of the supported authentication
        methods.
    @type supportedAuthentications: L{list} of L{bytes}
    @ivar user: the last username the client tried to authenticate with
    @type user: L{bytes}
    @ivar method: the current authentication method
    @type method: L{bytes}
    @ivar nextService: the service the user wants started after authentication
        has been completed.
    @type nextService: L{bytes}
    @ivar portal: the L{twisted.cred.portal.Portal} we are using for
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        @type user: L{bytes}
        @param data: authentication specific data sent by the client.
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    @type name: L{str}
    @ivar preferredOrder: a list of authentication methods that should be used
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    @type preferredOrder: L{list}
    @ivar user: the name of the user to authenticate as
    @type user: L{bytes}
    @ivar instance: the service to start after authentication has finished
    @type instance: L{service.SSHService}
    @ivar authenticatedWith: a list of strings of authentication methods we've tried
    @type authenticatedWith: L{list} of L{bytes}
    @ivar triedPublicKeys: a list of public key objects that we've tried to
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        @return: a L{defer.Deferred} that will be callbacked with L{None} as
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