239 lines
9.0 KiB
Java
239 lines
9.0 KiB
Java
/*
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* Copyright (c) 2023, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/* @test
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* @bug 8272746
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* @summary Verify that ZipFile rejects files with CEN sizes exceeding the implementation limit
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* @run testng/othervm EndOfCenValidation
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*/
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import org.testng.annotations.AfterTest;
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import org.testng.annotations.BeforeTest;
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import org.testng.annotations.Test;
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import java.io.*;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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import java.nio.channels.FileChannel;
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import java.nio.charset.StandardCharsets;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.StandardOpenOption;
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import java.util.Arrays;
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import java.util.EnumSet;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipException;
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import java.util.zip.ZipFile;
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import java.util.zip.ZipOutputStream;
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import static org.testng.Assert.*;
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/**
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* This test augments {@link TestTooManyEntries}. It creates sparse ZIPs where
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* the CEN size is inflated to the desired value. This helps this test run
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* fast with much less resources.
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*
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* While the CEN in these files are zero-filled and the produced ZIPs are technically
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* invalid, the CEN is never actually read by ZipFile since it does
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* 'End of central directory record' (END header) validation before reading the CEN.
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*/
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public class EndOfCenValidation {
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// Zip files produced by this test
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public static final Path CEN_TOO_LARGE_ZIP = Path.of("cen-size-too-large.zip");
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public static final Path INVALID_CEN_SIZE = Path.of("invalid-zen-size.zip");
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public static final Path BAD_CEN_OFFSET_ZIP = Path.of("bad-cen-offset.zip");
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// Some ZipFile constants for manipulating the 'End of central directory record' (END header)
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private static final int ENDHDR = ZipFile.ENDHDR; // End of central directory record size
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private static final int ENDSIZ = ZipFile.ENDSIZ; // Offset of CEN size field within ENDHDR
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private static final int ENDOFF = ZipFile.ENDOFF; // Offset of CEN offset field within ENDHDR
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// Maximum allowed CEN size allowed by ZipFile
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private static int MAX_CEN_SIZE = Integer.MAX_VALUE - ENDHDR - 1;
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// Expected message when CEN size does not match file size
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private static final String INVALID_CEN_BAD_SIZE = "invalid END header (bad central directory size)";
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// Expected message when CEN offset is too large
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private static final String INVALID_CEN_BAD_OFFSET = "invalid END header (bad central directory offset)";
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// Expected message when CEN size is too large
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private static final String INVALID_CEN_SIZE_TOO_LARGE = "invalid END header (central directory size too large)";
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// A valid ZIP file, used as a template
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private byte[] zipBytes;
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/**
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* Create a valid ZIP file, used as a template
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* @throws IOException if an error occurs
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*/
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@BeforeTest
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public void setup() throws IOException {
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zipBytes = templateZip();
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}
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/**
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* Delete big files after test, in case the file system did not support sparse files.
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* @throws IOException if an error occurs
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*/
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@AfterTest
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public void cleanup() throws IOException {
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Files.deleteIfExists(CEN_TOO_LARGE_ZIP);
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Files.deleteIfExists(INVALID_CEN_SIZE);
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Files.deleteIfExists(BAD_CEN_OFFSET_ZIP);
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}
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/**
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* Validates that an 'End of central directory record' (END header) with a CEN
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* length exceeding {@link #MAX_CEN_SIZE} limit is rejected
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* @throws IOException if an error occurs
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*/
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@Test
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public void shouldRejectTooLargeCenSize() throws IOException {
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int size = MAX_CEN_SIZE + 1;
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Path zip = zipWithModifiedEndRecord(size, true, 0, CEN_TOO_LARGE_ZIP);
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ZipException ex = expectThrows(ZipException.class, () -> {
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new ZipFile(zip.toFile());
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});
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assertEquals(ex.getMessage(), INVALID_CEN_SIZE_TOO_LARGE);
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}
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/**
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* Validate that an 'End of central directory record' (END header)
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* where the value of the CEN size field exceeds the position of
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* the END header is rejected.
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* @throws IOException if an error occurs
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*/
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@Test
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public void shouldRejectInvalidCenSize() throws IOException {
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int size = MAX_CEN_SIZE;
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Path zip = zipWithModifiedEndRecord(size, false, 0, INVALID_CEN_SIZE);
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ZipException ex = expectThrows(ZipException.class, () -> {
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new ZipFile(zip.toFile());
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});
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assertEquals(ex.getMessage(), INVALID_CEN_BAD_SIZE);
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}
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/**
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* Validate that an 'End of central directory record' (the END header)
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* where the value of the CEN offset field is larger than the position
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* of the END header minus the CEN size is rejected
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* @throws IOException if an error occurs
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*/
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@Test
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public void shouldRejectInvalidCenOffset() throws IOException {
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int size = MAX_CEN_SIZE;
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Path zip = zipWithModifiedEndRecord(size, true, 100, BAD_CEN_OFFSET_ZIP);
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ZipException ex = expectThrows(ZipException.class, () -> {
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new ZipFile(zip.toFile());
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});
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assertEquals(ex.getMessage(), INVALID_CEN_BAD_OFFSET);
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}
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/**
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* Create an ZIP file with a single entry, then modify the CEN size
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* in the 'End of central directory record' (END header) to the given size.
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*
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* The CEN is optionally "inflated" with trailing zero bytes such that
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* its actual size matches the one stated in the END header.
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*
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* The CEN offset is optiontially adjusted by the given amount
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*
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* The resulting ZIP is technically not valid, but it does allow us
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* to test that large or invalid CEN sizes are rejected
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* @param cenSize the CEN size to put in the END record
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* @param inflateCen if true, zero-pad the CEN to the desired size
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* @param cenOffAdjust Adjust the CEN offset field of the END record with this amount
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* @throws IOException if an error occurs
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*/
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private Path zipWithModifiedEndRecord(int cenSize,
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boolean inflateCen,
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int cenOffAdjust,
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Path zip) throws IOException {
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// A byte buffer for reading the END
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ByteBuffer buffer = ByteBuffer.wrap(zipBytes.clone()).order(ByteOrder.LITTLE_ENDIAN);
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// Offset of the END header
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int endOffset = buffer.limit() - ENDHDR;
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// Modify the CEN size
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int sizeOffset = endOffset + ENDSIZ;
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int currentCenSize = buffer.getInt(sizeOffset);
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buffer.putInt(sizeOffset, cenSize);
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// Optionally modify the CEN offset
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if (cenOffAdjust != 0) {
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int offOffset = endOffset + ENDOFF;
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int currentCenOff = buffer.getInt(offOffset);
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buffer.putInt(offOffset, currentCenOff + cenOffAdjust);
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}
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// When creating a sparse file, the file must not already exit
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Files.deleteIfExists(zip);
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// Open a FileChannel for writing a sparse file
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EnumSet<StandardOpenOption> options = EnumSet.of(StandardOpenOption.CREATE_NEW,
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StandardOpenOption.WRITE,
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StandardOpenOption.SPARSE);
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try (FileChannel channel = FileChannel.open(zip, options)) {
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// Write everything up to END
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channel.write(buffer.slice(0, buffer.limit() - ENDHDR));
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if (inflateCen) {
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// Inject "empty bytes" to make the actual CEN size match the END
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int injectBytes = cenSize - currentCenSize;
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channel.position(channel.position() + injectBytes);
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}
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// Write the modified END
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channel.write(buffer.slice(buffer.limit() - ENDHDR, ENDHDR));
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}
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return zip;
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}
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/**
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* Produce a byte array of a ZIP with a single entry
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*
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* @throws IOException if an error occurs
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*/
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private byte[] templateZip() throws IOException {
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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try (ZipOutputStream zo = new ZipOutputStream(bout)) {
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ZipEntry entry = new ZipEntry("duke.txt");
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zo.putNextEntry(entry);
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zo.write("duke".getBytes(StandardCharsets.UTF_8));
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}
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return bout.toByteArray();
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}
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}
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