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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.
*/
#define LOG_TAG "TrustyGateKeeper"
#include <android-base/logging.h>
#include <limits>
#include "trusty_gatekeeper.h"
#include "trusty_gatekeeper_ipc.h"
#include "gatekeeper_ipc.h"
using ::android::hardware::hidl_vec;
using ::android::hardware::Return;
using ::android::hardware::gatekeeper::V1_0::GatekeeperStatusCode;
using ::gatekeeper::EnrollRequest;
using ::gatekeeper::EnrollResponse;
using ::gatekeeper::ERROR_INVALID;
using ::gatekeeper::ERROR_MEMORY_ALLOCATION_FAILED;
using ::gatekeeper::ERROR_NONE;
using ::gatekeeper::ERROR_RETRY;
using ::gatekeeper::SizedBuffer;
using ::gatekeeper::VerifyRequest;
using ::gatekeeper::VerifyResponse;
namespace gatekeeper {
constexpr const uint32_t SEND_BUF_SIZE = 8192;
constexpr const uint32_t RECV_BUF_SIZE = 8192;
TrustyGateKeeperDevice::TrustyGateKeeperDevice() {
int rc = trusty_gatekeeper_connect();
if (rc < 0) {
LOG(ERROR) << "Error initializing trusty session: " << rc;
}
error_ = rc;
}
TrustyGateKeeperDevice::~TrustyGateKeeperDevice() {
trusty_gatekeeper_disconnect();
}
SizedBuffer hidl_vec2sized_buffer(const hidl_vec<uint8_t>& vec) {
if (vec.size() == 0 || vec.size() > std::numeric_limits<uint32_t>::max()) return {};
auto buffer = new uint8_t[vec.size()];
std::copy(vec.begin(), vec.end(), buffer);
return {buffer, static_cast<uint32_t>(vec.size())};
}
Return<void> TrustyGateKeeperDevice::enroll(uint32_t uid,
const hidl_vec<uint8_t>& currentPasswordHandle,
const hidl_vec<uint8_t>& currentPassword,
const hidl_vec<uint8_t>& desiredPassword,
enroll_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
if (desiredPassword.size() == 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
EnrollRequest request(uid, hidl_vec2sized_buffer(currentPasswordHandle),
hidl_vec2sized_buffer(desiredPassword),
hidl_vec2sized_buffer(currentPassword));
EnrollResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_RETRY) {
_hidl_cb({GatekeeperStatusCode::ERROR_RETRY_TIMEOUT, response.retry_timeout, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
hidl_vec<uint8_t> new_handle(response.enrolled_password_handle.Data<uint8_t>(),
response.enrolled_password_handle.Data<uint8_t>() +
response.enrolled_password_handle.size());
_hidl_cb({GatekeeperStatusCode::STATUS_OK, response.retry_timeout, new_handle});
}
return {};
}
Return<void> TrustyGateKeeperDevice::verify(
uint32_t uid, uint64_t challenge,
const ::android::hardware::hidl_vec<uint8_t>& enrolledPasswordHandle,
const ::android::hardware::hidl_vec<uint8_t>& providedPassword, verify_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
if (enrolledPasswordHandle.size() == 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
VerifyRequest request(uid, challenge, hidl_vec2sized_buffer(enrolledPasswordHandle),
hidl_vec2sized_buffer(providedPassword));
VerifyResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_RETRY) {
_hidl_cb({GatekeeperStatusCode::ERROR_RETRY_TIMEOUT, response.retry_timeout, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
hidl_vec<uint8_t> auth_token(
response.auth_token.Data<uint8_t>(),
response.auth_token.Data<uint8_t>() + response.auth_token.size());
_hidl_cb({response.request_reenroll ? GatekeeperStatusCode::STATUS_REENROLL
: GatekeeperStatusCode::STATUS_OK,
response.retry_timeout, auth_token});
}
return {};
}
Return<void> TrustyGateKeeperDevice::deleteUser(uint32_t uid, deleteUser_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
DeleteUserRequest request(uid);
DeleteUserResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_NOT_IMPLEMENTED) {
_hidl_cb({GatekeeperStatusCode::ERROR_NOT_IMPLEMENTED, 0, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
_hidl_cb({GatekeeperStatusCode::STATUS_OK, response.retry_timeout, {}});
}
return {};
}
Return<void> TrustyGateKeeperDevice::deleteAllUsers(deleteAllUsers_cb _hidl_cb) {
if (error_ != 0) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
return {};
}
DeleteAllUsersRequest request;
DeleteAllUsersResponse response;
auto error = Send(request, &response);
if (error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else if (response.error == ERROR_NOT_IMPLEMENTED) {
_hidl_cb({GatekeeperStatusCode::ERROR_NOT_IMPLEMENTED, 0, {}});
} else if (response.error != ERROR_NONE) {
_hidl_cb({GatekeeperStatusCode::ERROR_GENERAL_FAILURE, 0, {}});
} else {
_hidl_cb({GatekeeperStatusCode::STATUS_OK, response.retry_timeout, {}});
}
return {};
}
gatekeeper_error_t TrustyGateKeeperDevice::Send(uint32_t command, const GateKeeperMessage& request,
GateKeeperMessage *response) {
uint32_t request_size = request.GetSerializedSize();
if (request_size > SEND_BUF_SIZE)
return ERROR_INVALID;
uint8_t send_buf[SEND_BUF_SIZE];
request.Serialize(send_buf, send_buf + request_size);
// Send it
uint8_t recv_buf[RECV_BUF_SIZE];
uint32_t response_size = RECV_BUF_SIZE;
int rc = trusty_gatekeeper_call(command, send_buf, request_size, recv_buf, &response_size);
if (rc < 0) {
LOG(ERROR) << "error (" << rc << ") calling gatekeeper TA";
return ERROR_INVALID;
}
const gatekeeper_message *msg = reinterpret_cast<gatekeeper_message *>(recv_buf);
const uint8_t *payload = msg->payload;
return response->Deserialize(payload, payload + response_size);
}
};
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