| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| package org.apache.sshd.server.scp; |
| |
| import java.io.IOException; |
| import java.nio.file.AccessDeniedException; |
| import java.nio.file.Path; |
| import java.nio.file.attribute.PosixFilePermission; |
| import java.util.Set; |
| |
| import org.apache.sshd.common.scp.AbstractScpTransferEventListenerAdapter; |
| |
| /** |
| * Provides a simple access control by making a distinction between methods |
| * that upload data and ones that download it |
| * @author <a href="mailto:dev@mina.apache.org">Apache MINA SSHD Project</a> |
| */ |
| public abstract class SimpleAccessControlScpEventListener extends AbstractScpTransferEventListenerAdapter { |
| public static final SimpleAccessControlScpEventListener READ_ONLY_ACCESSOR = |
| new SimpleAccessControlScpEventListener() { |
| @Override |
| protected boolean isFileUploadAllowed(Path path) throws IOException { |
| return false; |
| } |
| |
| @Override |
| protected boolean isFileDownloadAllowed(Path path) throws IOException { |
| return true; |
| } |
| }; |
| |
| protected SimpleAccessControlScpEventListener() { |
| super(); |
| } |
| |
| @Override |
| public void startFileEvent(FileOperation op, Path file, long length, Set<PosixFilePermission> perms) |
| throws IOException { |
| super.startFileEvent(op, file, length, perms); |
| switch(op) { |
| case SEND: |
| if (!isFileDownloadAllowed(file)) { |
| throw new AccessDeniedException(file.toString()); |
| } |
| break; |
| |
| case RECEIVE: |
| if (!isFileUploadAllowed(file)) { |
| throw new AccessDeniedException(file.toString()); |
| } |
| break; |
| default: |
| throw new UnsupportedOperationException("Unknown file operation: " + op); |
| } |
| } |
| |
| @Override |
| public void startFolderEvent(FileOperation op, Path file, Set<PosixFilePermission> perms) throws IOException { |
| super.startFolderEvent(op, file, perms); |
| switch(op) { |
| case SEND: |
| if (!isFileDownloadAllowed(file)) { |
| throw new AccessDeniedException(file.toString()); |
| } |
| break; |
| |
| case RECEIVE: |
| if (!isFileUploadAllowed(file)) { |
| throw new AccessDeniedException(file.toString()); |
| } |
| break; |
| default: |
| throw new UnsupportedOperationException("Unknown file operation: " + op); |
| } |
| } |
| |
| /** |
| * @param path The local file/folder path |
| * @return {@code true} if client is allowed to read from the specified local path |
| * @throws IOException If failed to handle the call |
| */ |
| protected abstract boolean isFileDownloadAllowed(Path path) throws IOException; |
| |
| /** |
| * @param path The local file/folder path |
| * @return {@code true} if client is allowed to write to the specified local path |
| * @throws IOException If failed to handle the call |
| */ |
| protected abstract boolean isFileUploadAllowed(Path path) throws IOException; |
| } |