Implementation of SecureP2PSocket

remoting/protocol/secure_p2p_socket.h

+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Implement a secure P2P socket according to the W3C spec
+//
+// "Video conferencing and peer-to-peer communication"
+// http://www.whatwg.org/specs/web-apps/current-work/complete/video-conferencing-and-peer-to-peer-communication.html#peer-to-peer-connections
+//
+// This class operates on an establish socket to perform encryption for P2P
+// connection. This class does not perform chunking for outgoing buffers, all
+// outgoing buffers have to be 44 bytes smaller than MTU to allow space for
+// header to support encryption.
+
+#ifndef REMOTING_PROTOCOL_SECURE_P2P_SOCKET_H_
+#define REMOTING_PROTOCOL_SOCKET_P2P_SOCKET_H_
+
+#include <string>
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "crypto/encryptor.h"
+#include "crypto/hmac.h"
+#include "net/socket/socket.h"
+
+namespace crypto {
+class SymmetricKey;
+}  // namespace crypto
+
+namespace net {
+class IOBufferWithSize;
+}  // namespace net
+
+namespace remoting {
+namespace protocol {
+
+class SecureP2PSocket : public net::Socket {
+ public:
+  // Construct a secured P2P socket using |socket| as the underlying
+  // socket. Ownership of |socket| is transfered to this object.
+  SecureP2PSocket(net::Socket* socket, const std::string& ice_key);
+
+  // Socket implementation.
+  virtual int Read(net::IOBuffer* buf, int buf_len,
+                   net::CompletionCallback* callback);
+  virtual int Write(net::IOBuffer* buf, int buf_len,
+                    net::CompletionCallback* callback);
+  virtual bool SetReceiveBufferSize(int32 size);
+  virtual bool SetSendBufferSize(int32 size);
+
+ private:
+  int ReadInternal();
+  void ReadDone(int err);
+  void WriteDone(int err);
+  int DecryptBuffer(int size);
+
+  scoped_ptr<net::Socket> socket_;
+
+  uint64 write_seq_;
+  uint64 read_seq_;
+
+  net::CompletionCallback* user_read_callback_;
+  scoped_refptr<net::IOBuffer> user_read_buf_;
+  int user_read_buf_len_;
+
+  net::CompletionCallback* user_write_callback_;
+  int user_write_buf_len_;
+
+  scoped_ptr<net::CompletionCallback> read_callback_;
+  scoped_refptr<net::IOBufferWithSize> read_buf_;
+
+  scoped_ptr<net::CompletionCallback> write_callback_;
+
+  scoped_ptr<crypto::SymmetricKey> mask_key_;
+  crypto::HMAC msg_hasher_;
+  crypto::Encryptor encryptor_;
+
+  DISALLOW_COPY_AND_ASSIGN(SecureP2PSocket);
+};
+
+}  // namespace protocol
+}  // namespace remoting
+
+#endif  // REMOTING_PROTOCOL_SOCKET_P2P_SOCKET_H_