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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 "gatekeeperd"
#include "IGateKeeperService.h"
#include <cutils/log.h>
#include <utils/Log.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <binder/PermissionCache.h>
#include <utils/String16.h>
#include <keystore/IKeystoreService.h>
#include <hardware/gatekeeper.h>
namespace android {
static const String16 KEYGUARD_PERMISSION("android.permission.ACCESS_KEYGUARD_SECURE_STORAGE");
static const String16 DUMP_PERMISSION("android.permission.DUMP");
class GateKeeperProxy : public BnGateKeeperService {
public:
GateKeeperProxy() {
int ret = hw_get_module_by_class(GATEKEEPER_HARDWARE_MODULE_ID, NULL, &module);
if (ret < 0)
LOG_ALWAYS_FATAL_IF(ret < 0, "Unable to find GateKeeper HAL");
ret = gatekeeper_open(module, &device);
if (ret < 0)
LOG_ALWAYS_FATAL_IF(ret < 0, "Unable to open GateKeeper HAL");
}
virtual ~GateKeeperProxy() {
gatekeeper_close(device);
}
virtual status_t 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) {
IPCThreadState* ipc = IPCThreadState::self();
const int calling_pid = ipc->getCallingPid();
const int calling_uid = ipc->getCallingUid();
if (!PermissionCache::checkPermission(KEYGUARD_PERMISSION, calling_pid, calling_uid)) {
return PERMISSION_DENIED;
}
// need a desired password to enroll
if (desired_password_length == 0) return -EINVAL;
int ret = device->enroll(device, uid,
current_password_handle, current_password_handle_length,
current_password, current_password_length,
desired_password, desired_password_length,
enrolled_password_handle, enrolled_password_handle_length);
return ret >= 0 ? NO_ERROR : UNKNOWN_ERROR;
}
virtual status_t verify(uint32_t uid,
const uint8_t *enrolled_password_handle, uint32_t enrolled_password_handle_length,
const uint8_t *provided_password, uint32_t provided_password_length) {
IPCThreadState* ipc = IPCThreadState::self();
const int calling_pid = ipc->getCallingPid();
const int calling_uid = ipc->getCallingUid();
if (!PermissionCache::checkPermission(KEYGUARD_PERMISSION, calling_pid, calling_uid)) {
return PERMISSION_DENIED;
}
// can't verify if we're missing either param
if ((enrolled_password_handle_length | provided_password_length) == 0)
return -EINVAL;
uint8_t *auth_token;
uint32_t auth_token_length;
int ret = device->verify(device, uid,
enrolled_password_handle, enrolled_password_handle_length,
provided_password, provided_password_length, &auth_token, &auth_token_length);
if (ret >= 0 && auth_token != NULL && auth_token_length > 0) {
// TODO: cache service?
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16("android.security.keystore"));
sp<IKeystoreService> service = interface_cast<IKeystoreService>(binder);
if (service != NULL) {
if (service->addAuthToken(auth_token, auth_token_length) != NO_ERROR) {
ALOGE("Falure sending auth token to KeyStore");
}
} else {
ALOGE("Unable to communicate with KeyStore");
}
}
return ret >= 0 ? NO_ERROR : UNKNOWN_ERROR;
}
virtual status_t dump(int fd, const Vector<String16> &) {
IPCThreadState* ipc = IPCThreadState::self();
const int pid = ipc->getCallingPid();
const int uid = ipc->getCallingUid();
if (!PermissionCache::checkPermission(DUMP_PERMISSION, pid, uid)) {
return PERMISSION_DENIED;
}
if (device == NULL) {
const char *result = "Device not available";
write(fd, result, strlen(result) + 1);
} else {
const char *result = "OK";
write(fd, result, strlen(result) + 1);
}
return NO_ERROR;
}
private:
gatekeeper_device_t *device;
const hw_module_t *module;
};
}// namespace android
int main() {
ALOGI("Starting gatekeeperd...");
android::sp<android::IServiceManager> sm = android::defaultServiceManager();
android::sp<android::GateKeeperProxy> proxy = new android::GateKeeperProxy();
android::status_t ret = sm->addService(
android::String16("android.service.gatekeeper.IGateKeeperService"), proxy);
if (ret != android::OK) {
ALOGE("Couldn't register binder service!");
return -1;
}
/*
* We're the only thread in existence, so we're just going to process
* Binder transaction as a single-threaded program.
*/
android::IPCThreadState::self()->joinThreadPool();
return 0;
}
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