Authenticate user/password with PAM in BeginSessionRequest()

remoting/host/user_authenticator.h

Index: remoting/host/user_authenticator.h
diff --git a/remoting/host/user_authenticator.h b/remoting/host/user_authenticator.h
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+// 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.
+
+#ifndef REMOTING_HOST_USER_AUTHENTICATOR_H_
+#define REMOTING_HOST_USER_AUTHENTICATOR_H_
+
+#include <string>
+
+namespace remoting {
+
+// Interface for authenticating users for access to remote desktop session.
+// Implementation is platform-specific.
+// Implementations may assume each instance of this class handles only a
+// single Authenticate request.
+// TODO(lambroslambrou): Decide whether this needs an asychronous interface
+// (for example AuthenticateStart()..AuthenticateEndCallback()), or whether the
+// multi-threading policy could be handled by the caller.
+class UserAuthenticator {
+ public:
+  virtual ~UserAuthenticator() {}
+
+  // Authenticate a user, returning true if the username/password are valid.
+  virtual bool Authenticate(const std::string& username,
+                            const std::string& password) = 0;
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_USER_AUTHENTICATOR_H_