1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.fileupload;
18
19
20 /**
21 * This exception is thrown in case of an invalid file name.
22 * A file name is invalid, if it contains a NUL character.
23 * Attackers might use this to circumvent security checks:
24 * For example, a malicious user might upload a file with the name
25 * "foo.exe\0.png". This file name might pass security checks (i.e.
26 * checks for the extension ".png"), while, depending on the underlying
27 * C library, it might create a file named "foo.exe", as the NUL
28 * character is the string terminator in C.
29 */
30 public class InvalidFileNameException extends RuntimeException {
31 private static final long serialVersionUID = 7922042602454350470L;
32 private final String name;
33
34 /**
35 * Creates a new instance.
36 * @param pName The file name causing the exception.
37 * @param pMessage A human readable error message.
38 */
39 public InvalidFileNameException(String pName, String pMessage) {
40 super(pMessage);
41 name = pName;
42 }
43
44 /**
45 * Returns the invalid file name.
46 */
47 public String getName() {
48 return name;
49 }
50 }