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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef REMOTING_PROTOCOL_VALIDATING_AUTHENTICATOR_H_ |
| 6 #define REMOTING_PROTOCOL_VALIDATING_AUTHENTICATOR_H_ |
| 7 |
| 8 #include <memory> |
| 9 #include <string> |
| 10 |
| 11 #include "base/callback.h" |
| 12 #include "base/macros.h" |
| 13 #include "base/memory/ref_counted.h" |
| 14 #include "base/memory/weak_ptr.h" |
| 15 #include "remoting/protocol/authenticator.h" |
| 16 |
| 17 namespace remoting { |
| 18 namespace protocol { |
| 19 |
| 20 // This authenticator class provides a way to check the validity of a connection |
| 21 // as it is being established through an asynchronous callback. The validation |
| 22 // logic supplied by the caller is run when the first message is received from |
| 23 // the client. If the connection details are valid (e.g. conform to the current |
| 24 // policies), then the initial message, and all subsequent messages, are passed |
| 25 // to the underlying authenticator instance for processing. |
| 26 class ValidatingAuthenticator : public Authenticator { |
| 27 public: |
| 28 enum class Result { |
| 29 SUCCESS, |
| 30 ERROR_INVALID_CREDENTIALS, |
| 31 ERROR_INVALID_ACCOUNT, |
| 32 ERROR_REJECTED_BY_USER |
| 33 }; |
| 34 |
| 35 typedef base::Callback<void(Result validation_result)> ResultCallback; |
| 36 |
| 37 typedef base::Callback<void(const std::string& remote_jid, |
| 38 const ResultCallback& callback)> |
| 39 ValidationCallback; |
| 40 |
| 41 ValidatingAuthenticator(const std::string& remote_jid, |
| 42 const ValidationCallback& validation_callback, |
| 43 std::unique_ptr<Authenticator> current_authenticator); |
| 44 ~ValidatingAuthenticator() override; |
| 45 |
| 46 // Authenticator interface. |
| 47 State state() const override; |
| 48 bool started() const override; |
| 49 RejectionReason rejection_reason() const override; |
| 50 const std::string& GetAuthKey() const override; |
| 51 std::unique_ptr<ChannelAuthenticator> CreateChannelAuthenticator() |
| 52 const override; |
| 53 void ProcessMessage(const buzz::XmlElement* message, |
| 54 const base::Closure& resume_callback) override; |
| 55 std::unique_ptr<buzz::XmlElement> GetNextMessage() override; |
| 56 |
| 57 private: |
| 58 // Checks |validation_result|. On success, |message| and |resume_callback| |
| 59 // are passed on to |current_authenticator_|. If the connection was rejected, |
| 60 // |state_| and |rejection_reason_| are updated and |resume_callback| is run. |
| 61 void OnValidateComplete(const buzz::XmlElement* message, |
| 62 const base::Closure& resume_callback, |
| 63 Result validation_result); |
| 64 |
| 65 // Updates |state_| to reflect the current underlying authenticator state. |
| 66 // |resume_callback| is called after the state is updated. |
| 67 void UpdateState(const base::Closure& resume_callback); |
| 68 |
| 69 bool first_message_received_ = false; |
| 70 |
| 71 // The JID of the remote user. |
| 72 std::string remote_jid_; |
| 73 |
| 74 ValidationCallback validation_callback_; |
| 75 |
| 76 // Returns the current state of the authenticator. |
| 77 State state_ = Authenticator::WAITING_MESSAGE; |
| 78 |
| 79 // Returns the rejection reason. Can be called only when in REJECTED state. |
| 80 RejectionReason rejection_reason_ = Authenticator::INVALID_CREDENTIALS; |
| 81 |
| 82 std::unique_ptr<Authenticator> current_authenticator_; |
| 83 |
| 84 base::WeakPtrFactory<ValidatingAuthenticator> weak_factory_; |
| 85 |
| 86 DISALLOW_COPY_AND_ASSIGN(ValidatingAuthenticator); |
| 87 }; |
| 88 |
| 89 } // namespace protocol |
| 90 } // namespace remoting |
| 91 |
| 92 #endif // REMOTING_PROTOCOL_VALIDATING_AUTHENTICATOR_H_ |
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