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/*
* Copyright (C) 2020 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 "IncrementalServiceValidation.h"
#include <android-base/stringprintf.h>
#include <binder/IPCThreadState.h>
#include <binder/PermissionCache.h>
#include <binder/PermissionController.h>
#include <errno.h>
#include <utils/String16.h>
namespace android::incremental {
binder::Status Ok() {
return binder::Status::ok();
}
binder::Status Exception(uint32_t code, const std::string& msg) {
return binder::Status::fromExceptionCode(code, String8(msg.c_str()));
}
int fromBinderStatus(const binder::Status& status) {
return status.exceptionCode() == binder::Status::EX_SERVICE_SPECIFIC
? status.serviceSpecificErrorCode() > 0
? -status.serviceSpecificErrorCode()
: status.serviceSpecificErrorCode() == 0 ? -EFAULT
: status.serviceSpecificErrorCode()
: -EIO;
}
binder::Status CheckPermissionForDataDelivery(const char* permission, const char* operation,
const char* package) {
using android::base::StringPrintf;
int32_t pid;
int32_t uid;
if (!PermissionCache::checkCallingPermission(String16(permission), &pid, &uid)) {
return Exception(binder::Status::EX_SECURITY,
StringPrintf("UID %d / PID %d lacks permission %s", uid, pid, permission));
}
String16 packageName{package};
PermissionController pc;
if (auto packageUid = pc.getPackageUid(packageName, 0); packageUid != uid) {
return Exception(binder::Status::EX_SECURITY,
StringPrintf("UID %d / PID %d does not own package %s", uid, pid,
package));
}
if (!operation) {
return binder::Status::ok();
}
// Caller must also have op granted.
switch (auto result = pc.noteOp(String16(operation), uid, packageName); result) {
case PermissionController::MODE_ALLOWED:
case PermissionController::MODE_DEFAULT:
return binder::Status::ok();
default:
return Exception(binder::Status::EX_SECURITY,
StringPrintf("UID %d / PID %d / package %s lacks app-op %s, error %d",
uid, pid, package, operation, result));
}
}
} // namespace android::incremental
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