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/*
* Copyright 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 TRUSTY_GATEKEEPER_H_
#define TRUSTY_GATEKEEPER_H_
#include <trusty_std.h>
#include <stdio.h>
#include <gatekeeper/gatekeeper.h>
#define LOG_TAG "trusty_gatekeeper"
#define TLOGE(fmt, ...) \
fprintf(stderr, "%s: %d: " fmt, LOG_TAG, __LINE__, ## __VA_ARGS__)
#if LOCAL_TRACE
#define TLOGI(fmt, ...) \
fprintf(stderr, "%s: %d: " fmt, LOG_TAG, __LINE__, ## __VA_ARGS__)
#else
#define TLOGI(fmt, ...)
#endif
namespace gatekeeper {
class TrustyGateKeeper : public GateKeeper {
public:
TrustyGateKeeper();
long OpenSession();
void CloseSession();
protected:
// See gatekeeper/gatekeeper.h for documentation
virtual bool GetAuthTokenKey(const uint8_t **auth_token_key, size_t *length) const;
virtual void GetPasswordKey(const uint8_t **password_key, size_t *length);
virtual void ComputePasswordSignature(uint8_t *signature, size_t signature_length,
const uint8_t *key, size_t key_length, const uint8_t *password,
size_t password_length, salt_t salt) const;
virtual void GetRandom(void *random, size_t requested_size) const;
virtual void ComputeSignature(uint8_t *signature, size_t signature_length,
const uint8_t *key, size_t key_length, const uint8_t *message,
const size_t length) const;
virtual uint64_t GetMillisecondsSinceBoot() const;
virtual bool GetFailureRecord(uint32_t uid, secure_id_t user_id, failure_record_t *record,
bool secure);
virtual bool WriteFailureRecord(uint32_t uid, failure_record_t *record, bool secure);
virtual bool ClearFailureRecord(uint32_t uid, secure_id_t user_id, bool secure);
virtual bool IsHardwareBacked() const;
private:
bool SeedRngIfNeeded();
bool ShouldReseedRng();
bool ReseedRng();
long DeriveMasterKey();
void ClearMasterKey();
void InitMemoryRecords();
bool GetMemoryRecord(secure_id_t user_id, failure_record_t *record);
bool WriteMemoryRecord(failure_record_t *record);
bool GetSecureFailureRecord(uint32_t uid, secure_id_t user_id,
failure_record_t *record);
bool WriteSecureFailureRecord(uint32_t uid, failure_record_t *record);
UniquePtr<uint8_t[]> master_key_;
bool rng_initialized_;
int calls_since_reseed_;
int num_mem_records_;
UniquePtr<failure_record_t[]> mem_records_;
};
}
#endif // TRUSTY_GATEKEEPER_H_
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