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/*
* Copyright 2017 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.
*/
#include "permission_helpers.h"
#include <base/logging.h>
#include <base/strings/stringprintf.h>
#include <binder/IPCThreadState.h>
#include <binder/IServiceManager.h>
#include <pwd.h>
#include <sys/types.h>
#include "IUserManager.h"
using ::android::binder::Status;
namespace android {
namespace bluetooth {
uid_t foregroundUserId;
uid_t systemUiUid;
static uid_t SYSTEM_UID = 1000;
constexpr int PER_USER_RANGE = 100000;
Status checkPermission(const char* permission) {
int32_t pid;
int32_t uid;
if (android::checkCallingPermission(String16(permission), &pid, &uid)) {
return Status::ok();
}
auto err = ::base::StringPrintf("UID %d / PID %d lacks permission %s", uid,
pid, permission);
return Status::fromExceptionCode(Status::EX_SECURITY, String8(err.c_str()));
}
bool isCallerActiveUser() {
IPCThreadState* ipcState = IPCThreadState::selfOrNull();
if (!ipcState) return true; // It's a local call
uid_t callingUid = ipcState->getCallingUid();
uid_t callingUser = callingUid / PER_USER_RANGE;
if (callingUid == getuid()) return true; // It's a local call
return (foregroundUserId == callingUser) || (systemUiUid == callingUid) ||
(SYSTEM_UID == callingUid);
}
bool isCallerActiveUserOrManagedProfile() {
IPCThreadState* ipcState = IPCThreadState::selfOrNull();
if (!ipcState) return true; // It's a local call
uid_t callingUid = ipcState->getCallingUid();
uid_t callingUser = callingUid / PER_USER_RANGE;
if (callingUid == getuid()) return true; // It's a local call
if ((foregroundUserId == callingUser) || (systemUiUid == callingUid) ||
(SYSTEM_UID == callingUid))
return true;
uid_t parentUser = callingUser;
sp<IServiceManager> sm = defaultServiceManager();
sp<IBinder> binder = sm->getService(String16("user"));
sp<IUserManager> um = interface_cast<IUserManager>(binder);
if (um != NULL) {
// Must use Bluetooth process identity when making call to get parent user
int64_t ident = ipcState->clearCallingIdentity();
parentUser = um->getProfileParentId(callingUser);
ipcState->restoreCallingIdentity(ident);
}
return foregroundUserId == parentUser;
}
} // namespace bluetooth
} // namespace android
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