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AliasCheckerSymlinkTest.java
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AliasCheckerSymlinkTest.java
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//
// ========================================================================
// Copyright (c) 1995-2021 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.test;
import java.io.File;
import java.net.URI;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.stream.Stream;
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.http.HttpStatus;
import org.eclipse.jetty.server.AllowedResourceAliasChecker;
import org.eclipse.jetty.server.Server;
import org.eclipse.jetty.server.ServerConnector;
import org.eclipse.jetty.server.SymlinkAllowedResourceAliasChecker;
import org.eclipse.jetty.server.handler.AllowSymLinkAliasChecker;
import org.eclipse.jetty.server.handler.ContextHandler;
import org.eclipse.jetty.servlet.DefaultServlet;
import org.eclipse.jetty.servlet.ServletContextHandler;
import org.eclipse.jetty.util.IO;
import org.eclipse.jetty.util.resource.PathResource;
import org.junit.jupiter.api.AfterAll;
import org.junit.jupiter.api.BeforeAll;
import org.junit.jupiter.params.ParameterizedTest;
import org.junit.jupiter.params.provider.Arguments;
import org.junit.jupiter.params.provider.MethodSource;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.junit.jupiter.api.Assertions.assertNotNull;
public class AliasCheckerSymlinkTest
{
private static Server _server;
private static ServerConnector _connector;
private static HttpClient _client;
private static ServletContextHandler _context;
private static Path _symlinkFile;
private static Path _symlinkExternalFile;
private static Path _symlinkDir;
private static Path _symlinkParentDir;
private static Path _symlinkSiblingDir;
private static Path _webInfSymlink;
private static Path _webrootSymlink;
private static Path getResource(String path) throws Exception
{
URL url = AliasCheckerSymlinkTest.class.getClassLoader().getResource(path);
assertNotNull(url);
return new File(url.toURI()).toPath();
}
private static void delete(Path path)
{
IO.delete(path.toFile());
}
private static void setAliasChecker(ContextHandler.AliasCheck aliasChecker)
{
_context.clearAliasChecks();
if (aliasChecker != null)
_context.addAliasCheck(aliasChecker);
}
@BeforeAll
public static void beforeAll() throws Exception
{
Path webRootPath = getResource("webroot");
Path fileInWebroot = webRootPath.resolve("file");
// Create symlink file that targets inside the webroot directory.
_symlinkFile = webRootPath.resolve("symlinkFile");
delete(_symlinkFile);
Files.createSymbolicLink(_symlinkFile, fileInWebroot).toFile().deleteOnExit();
// Create symlink file that targets outside the webroot directory.
_symlinkExternalFile = webRootPath.resolve("symlinkExternalFile");
delete(_symlinkExternalFile);
Files.createSymbolicLink(_symlinkExternalFile, getResource("file")).toFile().deleteOnExit();
// Symlink to a directory inside of the webroot.
_symlinkDir = webRootPath.resolve("symlinkDir");
delete(_symlinkDir);
Files.createSymbolicLink(_symlinkDir, webRootPath.resolve("documents")).toFile().deleteOnExit();
// Symlink to a directory parent of the webroot.
_symlinkParentDir = webRootPath.resolve("symlinkParentDir");
delete(_symlinkParentDir);
Files.createSymbolicLink(_symlinkParentDir, webRootPath.resolve("..")).toFile().deleteOnExit();
// Symlink to a directory outside of the webroot.
_symlinkSiblingDir = webRootPath.resolve("symlinkSiblingDir");
delete(_symlinkSiblingDir);
Files.createSymbolicLink(_symlinkSiblingDir, webRootPath.resolve("../sibling")).toFile().deleteOnExit();
// Symlink to the WEB-INF directory.
_webInfSymlink = webRootPath.resolve("webInfSymlink");
delete(_webInfSymlink);
Files.createSymbolicLink(_webInfSymlink, webRootPath.resolve("WEB-INF")).toFile().deleteOnExit();
// External symlink to webroot.
_webrootSymlink = webRootPath.resolve("../webrootSymlink");
delete(_webrootSymlink);
Files.createSymbolicLink(_webrootSymlink, webRootPath).toFile().deleteOnExit();
// Create and start Server and Client.
_server = new Server();
_connector = new ServerConnector(_server);
_server.addConnector(_connector);
_context = new ServletContextHandler();
_context.setContextPath("/");
_context.setBaseResource(new PathResource(webRootPath));
_context.setWelcomeFiles(new String[]{"index.html"});
_context.setProtectedTargets(new String[]{"/WEB-INF", "/META-INF"});
_context.getMimeTypes().addMimeMapping("txt", "text/plain;charset=utf-8");
_server.setHandler(_context);
_context.addServlet(DefaultServlet.class, "/");
_context.clearAliasChecks();
_server.start();
_client = new HttpClient();
_client.start();
}
@AfterAll
public static void afterAll() throws Exception
{
// Try to delete all files now so that the symlinks do not confuse other tests.
Files.delete(_symlinkFile);
Files.delete(_symlinkExternalFile);
Files.delete(_symlinkDir);
Files.delete(_symlinkParentDir);
Files.delete(_symlinkSiblingDir);
Files.delete(_webInfSymlink);
Files.delete(_webrootSymlink);
_client.stop();
_server.stop();
}
public static Stream<Arguments> testCases()
{
AllowedResourceAliasChecker allowedResource = new AllowedResourceAliasChecker(_context);
SymlinkAllowedResourceAliasChecker symlinkAllowedResource = new SymlinkAllowedResourceAliasChecker(_context);
AllowSymLinkAliasChecker allowSymlinks = new AllowSymLinkAliasChecker();
ContextHandler.ApproveAliases approveAliases = new ContextHandler.ApproveAliases();
return Stream.of(
// AllowedResourceAliasChecker that checks the target of symlinks.
Arguments.of(allowedResource, "/symlinkFile", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(allowedResource, "/symlinkExternalFile", HttpStatus.NOT_FOUND_404, null),
Arguments.of(allowedResource, "/symlinkDir/file", HttpStatus.OK_200, "This file is inside webroot/documents."),
Arguments.of(allowedResource, "/symlinkParentDir/webroot/file", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(allowedResource, "/symlinkParentDir/webroot/WEB-INF/web.xml", HttpStatus.NOT_FOUND_404, null),
Arguments.of(allowedResource, "/symlinkSiblingDir/file", HttpStatus.NOT_FOUND_404, null),
Arguments.of(allowedResource, "/webInfSymlink/web.xml", HttpStatus.NOT_FOUND_404, null),
// SymlinkAllowedResourceAliasChecker that does not check the target of symlinks, but only approves files obtained through a symlink.
Arguments.of(symlinkAllowedResource, "/symlinkFile", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(symlinkAllowedResource, "/symlinkExternalFile", HttpStatus.OK_200, "This file is outside webroot."),
Arguments.of(symlinkAllowedResource, "/symlinkDir/file", HttpStatus.OK_200, "This file is inside webroot/documents."),
Arguments.of(symlinkAllowedResource, "/symlinkParentDir/webroot/file", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(symlinkAllowedResource, "/symlinkParentDir/webroot/WEB-INF/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
Arguments.of(symlinkAllowedResource, "/symlinkSiblingDir/file", HttpStatus.OK_200, "This file is inside a sibling dir to webroot."),
Arguments.of(symlinkAllowedResource, "/webInfSymlink/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
// The AllowSymLinkAliasChecker.
Arguments.of(allowSymlinks, "/symlinkFile", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(allowSymlinks, "/symlinkExternalFile", HttpStatus.OK_200, "This file is outside webroot."),
Arguments.of(allowSymlinks, "/symlinkDir/file", HttpStatus.OK_200, "This file is inside webroot/documents."),
Arguments.of(allowSymlinks, "/symlinkParentDir/webroot/file", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(allowSymlinks, "/symlinkParentDir/webroot/WEB-INF/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
Arguments.of(allowSymlinks, "/symlinkSiblingDir/file", HttpStatus.OK_200, "This file is inside a sibling dir to webroot."),
Arguments.of(allowSymlinks, "/webInfSymlink/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
// The ApproveAliases (approves everything regardless).
Arguments.of(approveAliases, "/symlinkFile", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(approveAliases, "/symlinkExternalFile", HttpStatus.OK_200, "This file is outside webroot."),
Arguments.of(approveAliases, "/symlinkDir/file", HttpStatus.OK_200, "This file is inside webroot/documents."),
Arguments.of(approveAliases, "/symlinkParentDir/webroot/file", HttpStatus.OK_200, "This file is inside webroot."),
Arguments.of(approveAliases, "/symlinkParentDir/webroot/WEB-INF/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
Arguments.of(approveAliases, "/symlinkSiblingDir/file", HttpStatus.OK_200, "This file is inside a sibling dir to webroot."),
Arguments.of(approveAliases, "/webInfSymlink/web.xml", HttpStatus.OK_200, "This is the web.xml file."),
// No alias checker (any symlink should be an alias).
Arguments.of(null, "/symlinkFile", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/symlinkExternalFile", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/symlinkDir/file", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/symlinkParentDir/webroot/file", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/symlinkParentDir/webroot/WEB-INF/web.xml", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/symlinkSiblingDir/file", HttpStatus.NOT_FOUND_404, null),
Arguments.of(null, "/webInfSymlink/web.xml", HttpStatus.NOT_FOUND_404, null)
);
}
@ParameterizedTest
@MethodSource("testCases")
public void test(ContextHandler.AliasCheck aliasChecker, String path, int httpStatus, String responseContent) throws Exception
{
setAliasChecker(aliasChecker);
URI uri = URI.create("http://localhost:" + _connector.getLocalPort() + path);
ContentResponse response = _client.GET(uri);
assertThat(response.getStatus(), is(httpStatus));
if (responseContent != null)
assertThat(response.getContentAsString(), is(responseContent));
}
}