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/*
* Copyright (C) 2014 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 <hardware/gatekeeper.h>
#include <gatekeeper/gatekeeper_messages.h>
#include "gatekeeper_ipc.h"
namespace gatekeeper {
class TrustyGateKeeperDevice {
public:
TrustyGateKeeperDevice(const hw_module_t* module);
~TrustyGateKeeperDevice();
hw_device_t* hw_device();
/**
* Enrolls password_payload, which should be derived from a user selected pin or password,
* with the authentication factor private key used only for enrolling authentication
* factor data.
*
* Returns: 0 on success or an error code less than 0 on error.
* On error, enrolled_password will not be allocated.
*/
int Enroll(uint32_t uid, const uint8_t *current_password_handle,
uint32_t current_password_handle_length, const uint8_t *current_password,
uint32_t current_password_length, const uint8_t *desired_password,
uint32_t desired_password_length, uint8_t **enrolled_password_handle,
uint32_t *enrolled_password_handle_length);
/**
* Verifies provided_password matches expected_password after enrolling
* with the authentication factor private key.
*
* Implementations of this module may retain the result of this call
* to attest to the recency of authentication.
*
* On success, writes the address of a verification token to verification_token,
*
* Returns: 0 on success or an error code less than 0 on error
* On error, verification token will not be allocated
*/
int Verify(uint32_t uid, uint64_t challenge, const uint8_t *enrolled_password_handle,
uint32_t enrolled_password_handle_length, const uint8_t *provided_password,
uint32_t provided_password_length, uint8_t **auth_token, uint32_t *auth_token_length,
bool *request_reenroll);
private:
gatekeeper_error_t Send(uint32_t command, const GateKeeperMessage& request,
GateKeeperMessage* response);
gatekeeper_error_t Send(const EnrollRequest& request, EnrollResponse *response) {
return Send(GK_ENROLL, request, response);
}
gatekeeper_error_t Send(const VerifyRequest& request, VerifyResponse *response) {
return Send(GK_VERIFY, request, response);
}
// Static methods interfacing the HAL API with the TrustyGateKeeper device
/**
* Enrolls desired_password, which should be derived from a user selected pin or password,
* with the authentication factor private key used only for enrolling authentication
* factor data.
*
* If there was already a password enrolled, it should be provided in
* current_password_handle, along with the current password in current_password
* that should validate against current_password_handle.
*
* Returns: 0 on success or an error code less than 0 on error.
* On error, enrolled_password_handle will not be allocated.
*/
static int enroll(const struct gatekeeper_device *dev, uint32_t uid,
const uint8_t *current_password_handle, uint32_t current_password_handle_length,
const uint8_t *current_password, uint32_t current_password_length,
const uint8_t *desired_password, uint32_t desired_password_length,
uint8_t **enrolled_password_handle, uint32_t *enrolled_password_handle_length);
/**
* Verifies provided_password matches enrolled_password_handle.
*
* Implementations of this module may retain the result of this call
* to attest to the recency of authentication.
*
* On success, writes the address of a verification token to auth_token,
* usable to attest password verification to other trusted services. Clients
* may pass NULL for this value.
*
* Returns: 0 on success or an error code less than 0 on error
* On error, verification token will not be allocated
*/
static int verify(const struct gatekeeper_device *dev, uint32_t uid, uint64_t challenge,
const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
const uint8_t *provided_password, uint32_t provided_password_length,
uint8_t **auth_token, uint32_t *auth_token_length, bool *request_reenroll);
static int close_device(hw_device_t* dev);
gatekeeper_device device_;
int error_;
};
}
#endif
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