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_POLICY_SESSION_H_ 18 #define TRUNKS_POLICY_SESSION_H_ 19 20 #include <string> 21 #include <vector> 22 23 #include <base/macros.h> 24 25 #include "trunks/tpm_generated.h" 26 27 namespace trunks { 28 29 class AuthorizationDelegate; 30 31 // PolicySession is an interface for managing policy backed sessions for 32 // authorization and parameter encryption. 33 class PolicySession { 34 public: PolicySession()35 PolicySession() {} ~PolicySession()36 virtual ~PolicySession() {} 37 38 // Returns an authorization delegate for this session. Ownership of the 39 // delegate pointer is retained by the session. 40 virtual AuthorizationDelegate* GetDelegate() = 0; 41 42 // Starts a salted session which is bound to |bind_entity| with 43 // |bind_authorization_value|. Encryption is enabled if |enable_encryption| is 44 // true. The session remains active until this object is destroyed or another 45 // session is started with a call to Start*Session. 46 virtual TPM_RC StartBoundSession( 47 TPMI_DH_ENTITY bind_entity, 48 const std::string& bind_authorization_value, 49 bool enable_encryption) = 0; 50 51 // Starts a salted, unbound session. Encryption is enabled if 52 // |enable_encryption| is true. The session remains active until this object 53 // is destroyed or another session is started with a call to Start*Session. 54 virtual TPM_RC StartUnboundSession(bool enable_encryption) = 0; 55 56 // This method is used to get the current PolicyDigest of the PolicySession. 57 virtual TPM_RC GetDigest(std::string* digest) = 0; 58 59 // This method is used to construct a complex policy. It takes a list 60 // of policy digests. After the command is executed, the policy represented 61 // by this session is the OR of the provided policies. 62 virtual TPM_RC PolicyOR(const std::vector<std::string>& digests) = 0; 63 64 // This method binds the PolicySession to a provided PCR value. If the empty 65 // string is provided, the PolicySession is bound to the current PCR value. 66 virtual TPM_RC PolicyPCR(uint32_t pcr_index, 67 const std::string& pcr_value) = 0; 68 69 // This method binds the PolicySession to a specified CommandCode. 70 // Once called, this Session can only be used to authorize actions on the 71 // provided CommandCode. 72 virtual TPM_RC PolicyCommandCode(TPM_CC command_code) = 0; 73 74 // This method specifies that Authorization Values need to be included in 75 // HMAC computation done by the AuthorizationDelegate. 76 virtual TPM_RC PolicyAuthValue() = 0; 77 78 // Sets the current entity authorization value. This can be safely called 79 // while the session is active and subsequent commands will use the value. 80 virtual void SetEntityAuthorizationValue(const std::string& value) = 0; 81 82 private: 83 DISALLOW_COPY_AND_ASSIGN(PolicySession); 84 }; 85 86 } // namespace trunks 87 88 #endif // TRUNKS_POLICY_SESSION_H_ 89