/*
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* Copyright 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "permission_helpers.h"
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#include <base/logging.h>
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#include <base/strings/stringprintf.h>
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#include <binder/IPCThreadState.h>
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#include <binder/IServiceManager.h>
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#include <pwd.h>
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#include <sys/types.h>
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#include "IUserManager.h"
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using ::android::binder::Status;
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namespace android {
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namespace bluetooth {
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uid_t foregroundUserId;
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uid_t systemUiUid;
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static uid_t SYSTEM_UID = 1000;
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constexpr int PER_USER_RANGE = 100000;
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Status checkPermission(const char* permission) {
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int32_t pid;
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int32_t uid;
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if (android::checkCallingPermission(String16(permission), &pid, &uid)) {
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return Status::ok();
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}
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auto err = ::base::StringPrintf("UID %d / PID %d lacks permission %s", uid,
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pid, permission);
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return Status::fromExceptionCode(Status::EX_SECURITY, String8(err.c_str()));
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}
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bool isCallerActiveUser() {
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IPCThreadState* ipcState = IPCThreadState::selfOrNull();
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if (!ipcState) return true; // It's a local call
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uid_t callingUid = ipcState->getCallingUid();
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uid_t callingUser = callingUid / PER_USER_RANGE;
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if (callingUid == getuid()) return true; // It's a local call
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return (foregroundUserId == callingUser) || (systemUiUid == callingUid) ||
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(SYSTEM_UID == callingUid);
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}
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bool isCallerActiveUserOrManagedProfile() {
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IPCThreadState* ipcState = IPCThreadState::selfOrNull();
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if (!ipcState) return true; // It's a local call
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uid_t callingUid = ipcState->getCallingUid();
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uid_t callingUser = callingUid / PER_USER_RANGE;
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if (callingUid == getuid()) return true; // It's a local call
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if ((foregroundUserId == callingUser) || (systemUiUid == callingUid) ||
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(SYSTEM_UID == callingUid))
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return true;
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uid_t parentUser = callingUser;
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sp<IServiceManager> sm = defaultServiceManager();
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sp<IBinder> binder = sm->getService(String16("user"));
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sp<IUserManager> um = interface_cast<IUserManager>(binder);
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if (um != NULL) {
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// Must use Bluetooth process identity when making call to get parent user
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int64_t ident = ipcState->clearCallingIdentity();
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parentUser = um->getProfileParentId(callingUser);
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ipcState->restoreCallingIdentity(ident);
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}
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return foregroundUserId == parentUser;
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}
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} // namespace bluetooth
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} // namespace android
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