/*
* 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.ftpserver.ipfilter;
import java.net.InetAddress;
import java.net.InetSocketAddress;
import java.net.UnknownHostException;
import java.util.Collection;
import java.util.HashSet;
import java.util.concurrent.CopyOnWriteArraySet;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.firewall.Subnet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* An implementation of the <code>SessionFilter</code> interface, to filter
* sessions based on the remote IP address.
*
* @author <a href="http://mina.apache.org">Apache MINA Project</a>
*
*/
public class RemoteIpFilter extends CopyOnWriteArraySet<Subnet> implements
SessionFilter {
/**
* Logger
*/
Logger LOGGER = LoggerFactory.getLogger(RemoteIpFilter.class);
/**
* Serial version UID
*/
private static final long serialVersionUID = 4887092372700628783L;
/**
* filter type
*/
private IpFilterType type = null;
/**
* Creates a new instance of <code>RemoteIpFilter</code>.
*
* @param type
* the filter type
*/
public RemoteIpFilter(IpFilterType type) {
this(type, new HashSet<Subnet>(0));
}
/**
* Creates a new instance of <code>RemoteIpFilter</code>.
*
* @param type
* the filter type
* @param collection
* a collection of <code>Subnet</code>s to filter out/in.
*/
public RemoteIpFilter(IpFilterType type,
Collection<? extends Subnet> collection) {
super(collection);
this.type = type;
}
/**
* Creates a new instance of <code>RemoteIpFilter</code>.
*
* @param type
* the filter type
* @param addresses
* a comma, space, tab, CR, LF separated list of IP
* addresses/CIDRs.
* @throws UnknownHostException
* propagated
* @throws NumberFormatException
* propagated
*/
public RemoteIpFilter(IpFilterType type, String addresses)
throws NumberFormatException, UnknownHostException {
super();
this.type = type;
if (addresses != null) {
String[] tokens = addresses.split("[\\s,]+");
for (String token : tokens) {
if (token.trim().length() > 0) {
add(token);
}
}
}
if (LOGGER.isDebugEnabled()) {
LOGGER.debug(
"Created DefaultIpFilter of type {} with the subnets {}",
type, this);
}
}
/**
* Returns the type of this filter.
*
* @return the type of this filter.
*/
public IpFilterType getType() {
return type;
}
/**
* Sets the type of this filter.
*
* @param type
* the type of this filter.
*/
public void setType(IpFilterType type) {
this.type = type;
}
/**
* Adds the given string representation of InetAddress or CIDR notation to
* this filter.
*
* @param str
* the string representation of InetAddress or CIDR notation
* @return if the given element was added or not. <code>true</code>, if the
* given element was added to the filter; <code>false</code>, if the
* element already exists in the filter.
* @throws NumberFormatException
* propagated
* @throws UnknownHostException
* propagated
*/
public boolean add(String str) throws NumberFormatException,
UnknownHostException {
// This is required so we do not block loopback address if some one adds
// a string with blanks as the InetAddress class assumes loopback
// address on a blank string.
if (str.trim().length() < 1) {
throw new IllegalArgumentException("Invalid IP Address or Subnet: "
+ str);
}
String[] tokens = str.split("/");
if (tokens.length == 2) {
return add(new Subnet(InetAddress.getByName(tokens[0]), Integer
.parseInt(tokens[1])));
} else {
return add(new Subnet(InetAddress.getByName(tokens[0]), 32));
}
}
public boolean accept(IoSession session) {
InetAddress address = ((InetSocketAddress) session.getRemoteAddress())
.getAddress();
switch (type) {
case ALLOW:
for (Subnet subnet : this) {
if (subnet.inSubnet(address)) {
if (LOGGER.isDebugEnabled()) {
LOGGER
.debug(
"Allowing connection from {} because it matches with the whitelist subnet {}",
new Object[] { address, subnet });
}
return true;
}
}
if (LOGGER.isDebugEnabled()) {
LOGGER
.debug(
"Denying connection from {} because it does not match any of the whitelist subnets",
new Object[] { address });
}
return false;
case DENY:
if (isEmpty()) {
if (LOGGER.isDebugEnabled()) {
LOGGER
.debug(
"Allowing connection from {} because blacklist is empty",
new Object[] { address });
}
return true;
}
for (Subnet subnet : this) {
if (subnet.inSubnet(address)) {
if (LOGGER.isDebugEnabled()) {
LOGGER
.debug(
"Denying connection from {} because it matches with the blacklist subnet {}",
new Object[] { address, subnet });
}
return false;
}
}
if (LOGGER.isDebugEnabled()) {
LOGGER
.debug(
"Allowing connection from {} because it does not match any of the blacklist subnets",
new Object[] { address });
}
return true;
default:
throw new RuntimeException("Unknown or unimplemented filter type: "
+ type);
}
}
}