1 // Copyright 2021 Code Intelligence GmbH 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package com.example; 16 17 import com.code_intelligence.jazzer.api.FuzzedDataProvider; 18 import java.io.File; 19 import java.io.IOException; 20 21 public class ExamplePathTraversalFuzzer { 22 /** 23 * The root path for all files that this application is allowed to upload. 24 */ 25 public static final String publicFilesRootPath = "/app/upload/"; 26 fuzzerTestOneInput(FuzzedDataProvider data)27 public static void fuzzerTestOneInput(FuzzedDataProvider data) { 28 String relativePath = data.consumeRemainingAsAsciiString(); 29 // Upload the file and try very hard to ignore errors thrown during the upload. 30 try { 31 uploadFile(relativePath); 32 } catch (Throwable ignored) { 33 } 34 } 35 uploadFile(String relativePathToFile)36 private static void uploadFile(String relativePathToFile) throws IOException { 37 File fileToUpload = new File(publicFilesRootPath + relativePathToFile); 38 if (!fileToUpload.exists()) { 39 throw new IOException("File not found"); 40 } 41 // In a real application, the file would be uploaded to a public server here. 42 } 43 } 44