Ray Milkey | 07b666f | 2018-07-25 12:31:48 -0700 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2018-present Open Networking Foundation |
| 3 | * |
| 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | * you may not use this file except in compliance with the License. |
| 6 | * You may obtain a copy of the License at |
| 7 | * |
| 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | * |
| 10 | * Unless required by applicable law or agreed to in writing, software |
| 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | * See the License for the specific language governing permissions and |
| 14 | * limitations under the License. |
| 15 | */ |
| 16 | |
| 17 | package org.onlab.util; |
| 18 | |
| 19 | import java.io.File; |
| 20 | import java.io.IOException; |
| 21 | import java.util.zip.ZipEntry; |
| 22 | |
| 23 | /** |
| 24 | * Utilities for validation of Zip files. |
| 25 | */ |
| 26 | public final class ZipValidator { |
| 27 | |
| 28 | /** |
| 29 | * Do not allow construction. |
| 30 | */ |
| 31 | private ZipValidator() { |
| 32 | |
| 33 | } |
| 34 | |
| 35 | /** |
| 36 | * Validates a zip entry. Checks that the file being created does not |
| 37 | * lie outside the target directory. |
| 38 | * |
| 39 | * See https://snyk.io/research/zip-slip-vulnerability for more information. |
| 40 | * |
| 41 | * @param entry ZipEntry to check |
| 42 | * @param destinationDir target directory |
| 43 | * @return true if the Entry resolves to a file inside the target directory; false otherwise |
| 44 | */ |
| 45 | public static boolean validateZipEntry(ZipEntry entry, File destinationDir) { |
| 46 | try { |
| 47 | String canonicalDestinationDirPath = destinationDir.getCanonicalPath(); |
| 48 | File destinationFile = new File(destinationDir, entry.getName()); |
| 49 | String canonicalDestinationFile = destinationFile.getCanonicalPath(); |
| 50 | return canonicalDestinationFile.startsWith(canonicalDestinationDirPath + File.separator); |
| 51 | } catch (IOException ioe) { |
| 52 | return false; |
| 53 | } |
| 54 | } |
| 55 | |
| 56 | } |