1 // 2 // Copyright (C) 2015 The Android Open Source Project 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 #ifndef TRUNKS_SESSION_MANAGER_H_ 18 #define TRUNKS_SESSION_MANAGER_H_ 19 20 #include <string> 21 22 #include "trunks/hmac_authorization_delegate.h" 23 #include "trunks/tpm_generated.h" 24 #include "trunks/trunks_export.h" 25 26 namespace trunks { 27 28 const trunks::TPM_HANDLE kUninitializedHandle = 0; 29 30 // This class is used to keep track of a TPM session. Each instance of this 31 // class is used to account for one instance of a TPM session. Currently 32 // this class is used by AuthorizationSession instances to keep track of TPM 33 // sessions. 34 // Note: This class is not intended to be used independently. However clients 35 // who want to manually manage their sessions can use this class to Start and 36 // Close TPM backed Sessions. Example usage: 37 // std::unique_ptr<SessionManager> session_manager = 38 // factory.GetSessionManager(); 39 // session_manager->StartSession(...); 40 // TPM_HANDLE session_handle = session_manager->GetSessionHandle(); 41 class TRUNKS_EXPORT SessionManager { 42 public: 43 SessionManager() {} 44 virtual ~SessionManager() {} 45 46 // This method is used get the handle to the AuthorizationSession managed by 47 // this instance. 48 virtual TPM_HANDLE GetSessionHandle() const = 0; 49 50 // This method is used to flush all TPM context associated with the current 51 // session 52 virtual void CloseSession() = 0; 53 54 // This method is used to start a new AuthorizationSession. Once started, 55 // GetSessionHandle() can be used to access the handle to the TPM session. 56 // Since the sessions are salted, we need to ensure that TPM ownership is 57 // taken and the salting key created before this method is called. 58 // Returns TPM_RC_SUCCESS and returns the nonces used to create the session 59 // on success. 60 virtual TPM_RC StartSession(TPM_SE session_type, 61 TPMI_DH_ENTITY bind_entity, 62 const std::string& bind_authorization_value, 63 bool enable_encryption, 64 HmacAuthorizationDelegate* delegate) = 0; 65 66 private: 67 DISALLOW_COPY_AND_ASSIGN(SessionManager); 68 }; 69 70 } // namespace trunks 71 72 #endif // TRUNKS_SESSION_MANAGER_H_ 73
