90 lines
3.4 KiB
C++
90 lines
3.4 KiB
C++
//
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// Copyright (C) 2015 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#ifndef TRUNKS_POLICY_SESSION_H_
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#define TRUNKS_POLICY_SESSION_H_
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#include <string>
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#include <vector>
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#include <base/macros.h>
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#include "trunks/tpm_generated.h"
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namespace trunks {
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class AuthorizationDelegate;
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// PolicySession is an interface for managing policy backed sessions for
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// authorization and parameter encryption.
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class PolicySession {
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public:
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PolicySession() {}
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virtual ~PolicySession() {}
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// Returns an authorization delegate for this session. Ownership of the
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// delegate pointer is retained by the session.
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virtual AuthorizationDelegate* GetDelegate() = 0;
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// Starts a salted session which is bound to |bind_entity| with
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// |bind_authorization_value|. Encryption is enabled if |enable_encryption| is
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// true. The session remains active until this object is destroyed or another
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// session is started with a call to Start*Session.
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virtual TPM_RC StartBoundSession(TPMI_DH_ENTITY bind_entity,
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const std::string& bind_authorization_value,
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bool enable_encryption) = 0;
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// Starts a salted, unbound session. Encryption is enabled if
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// |enable_encryption| is true. The session remains active until this object
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// is destroyed or another session is started with a call to Start*Session.
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virtual TPM_RC StartUnboundSession(bool enable_encryption) = 0;
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// This method is used to get the current PolicyDigest of the PolicySession.
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virtual TPM_RC GetDigest(std::string* digest) = 0;
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// This method is used to construct a complex policy. It takes a list
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// of policy digests. After the command is executed, the policy represented
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// by this session is the OR of the provided policies.
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virtual TPM_RC PolicyOR(const std::vector<std::string>& digests) = 0;
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// This method binds the PolicySession to a provided PCR value. If the empty
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// string is provided, the PolicySession is bound to the current PCR value.
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virtual TPM_RC PolicyPCR(uint32_t pcr_index,
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const std::string& pcr_value) = 0;
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// This method binds the PolicySession to a specified CommandCode.
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// Once called, this Session can only be used to authorize actions on the
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// provided CommandCode.
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virtual TPM_RC PolicyCommandCode(TPM_CC command_code) = 0;
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// This method specifies that Authorization Values need to be included in
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// HMAC computation done by the AuthorizationDelegate.
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virtual TPM_RC PolicyAuthValue() = 0;
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// Reset a policy session to its original state.
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virtual TPM_RC PolicyRestart() = 0;
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// Sets the current entity authorization value. This can be safely called
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// while the session is active and subsequent commands will use the value.
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virtual void SetEntityAuthorizationValue(const std::string& value) = 0;
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private:
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DISALLOW_COPY_AND_ASSIGN(PolicySession);
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};
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} // namespace trunks
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#endif // TRUNKS_POLICY_SESSION_H_
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