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