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plugin-deployer-file-handler-context-impl.ts
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plugin-deployer-file-handler-context-impl.ts
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/********************************************************************************
* Copyright (C) 2018 Red Hat, Inc. 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
* http://www.eclipse.org/legal/epl-2.0.
*
* This Source Code may also be made available under the following Secondary
* Licenses when the conditions for such availability set forth in the Eclipse
* Public License v. 2.0 are satisfied: GNU General Public License, version 2
* with the GNU Classpath Exception which is available at
* https://www.gnu.org/software/classpath/license.html.
*
* SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
********************************************************************************/
import * as path from 'path';
import { promises as fs } from 'fs';
import { PluginDeployerEntry, PluginDeployerFileHandlerContext } from '../../common/plugin-protocol';
import * as decompress from 'decompress';
export class PluginDeployerFileHandlerContextImpl implements PluginDeployerFileHandlerContext {
constructor(private readonly pluginDeployerEntry: PluginDeployerEntry) {
}
async unzip(sourcePath: string, destPath: string): Promise<void> {
const zipSlipFiles = new Set<[string, string]>();
const absoluteDestPath = await fs.realpath(destPath);
await decompress(sourcePath, absoluteDestPath, {
/**
* Prevent zip-slip: https://snyk.io/research/zip-slip-vulnerability
*/
filter(file: decompress.File): boolean {
const expectedFilePath = path.join(absoluteDestPath, file.path);
// If dest is not found in the expected path, it means file will be unpacked somewhere else.
if (!expectedFilePath.startsWith(path.join(absoluteDestPath, path.sep))) {
zipSlipFiles.add([file.path, expectedFilePath]);
return false; // only skip the exploit files, maybe the rest is fine.
} else {
return true;
}
}
});
if (zipSlipFiles.size > 0) {
console.error(`Detected a zip-slip exploit in archive: "${sourcePath}"`);
for (const [relativePath, expectedPath] of zipSlipFiles) {
console.error(` - File "${relativePath}" was going to write to: "${expectedPath}"`);
}
console.error('See: https://snyk.io/research/zip-slip-vulnerability');
}
}
pluginEntry(): PluginDeployerEntry {
return this.pluginDeployerEntry;
}
}