pairing_authenticator_base.h | Explore in Territory

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef REMOTING_PROTOCOL_PAIRING_AUTHENTICATOR_BASE_H_
#define REMOTING_PROTOCOL_PAIRING_AUTHENTICATOR_BASE_H_

#include "base/memory/weak_ptr.h"
#include "remoting/protocol/authenticator.h"
#include "third_party/libjingle_xmpp/xmllite/xmlelement.h"

namespace remoting::protocol {

// The pairing authenticator builds on top of V2Authenticator to add
// support for PIN-less authentication via device pairing:
//
// * If a client device is already paired, it includes in the initial
//   authentication message a Client Id and the first SPAKE message
//   using the Paired Secret and HMAC_SHA256.
// * If the host recognizes the Client Id, it looks up the corresponding
//   Paired Secret and continue the SPAKE exchange.
// * If it does not recognize the Client Id, it initiates a SPAKE exchange
//   with HMAC_SHA256 using the PIN as the shared secret. The initial
//   message of this exchange includes an an error message, which
//   informs the client that the PIN-less connection failed and causes
//   it to prompt the user for a PIN to use for authentication
//   instead.
// * If, at any point, the SPAKE exchange fails with the Paired Secret,
//   the endpoint that detects the failure initiates a new SPAKE exchange
//   using the PIN, and includes an error message to instruct the peer
//   to do likewise.
//
// If a client device is not already paired, but supports pairing, then
// the V2Authenticator is used instead of this class. Only the method name
// differs, which the client uses to determine that pairing should be offered
// to the user (see NegotiatingHostAuthenticator::CreateAuthenticator and
// NegotiatingClientAuthenticator::CreateAuthenticatorForCurrentMethod).
class PairingAuthenticatorBase : public Authenticator { … };

}  // namespace remoting::protocol

#endif  // REMOTING_PROTOCOL_PAIRING_AUTHENTICATOR_BASE_H_
chromium/remoting/protocol/pairing_authenticator_base.h
