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