Backport ipfilter handler
Motivation: The ipfilter handler does not exists in 4.0 yet. Modifications: Backport the ipfilter from 4.1 to 4.0. Result: It's possible to use the ipfilter handler in 4.0 as well.
This commit is contained in:
Norman Maurer
parent
16d136dc55
commit
a0bde17eff
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.channel.ChannelInboundHandlerAdapter;
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import java.net.SocketAddress;
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/**
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* This class provides the functionality to either accept or reject new {@link Channel}s
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* based on their IP address.
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* <p>
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* You should inherit from this class if you would like to implement your own IP-based filter. Basically you have to
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* implement {@link #accept(ChannelHandlerContext, SocketAddress)} to decided whether you want to accept or reject
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* a connection from the remote address.
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* <p>
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* Furthermore overriding {@link #channelRejected(ChannelHandlerContext, SocketAddress)} gives you the
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* flexibility to respond to rejected (denied) connections. If you do not want to send a response, just have it return
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* null. Take a look at {@link RuleBasedIpFilter} for details.
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*/
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public abstract class AbstractRemoteAddressFilter<T extends SocketAddress> extends ChannelInboundHandlerAdapter {
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@Override
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public void channelRegistered(ChannelHandlerContext ctx) throws Exception {
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handleNewChannel(ctx);
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ctx.fireChannelRegistered();
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}
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@Override
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public void channelActive(ChannelHandlerContext ctx) throws Exception {
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if (!handleNewChannel(ctx)) {
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throw new IllegalStateException("cannot determine to accept or reject a channel: " + ctx.channel());
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} else {
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ctx.fireChannelActive();
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}
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}
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private boolean handleNewChannel(ChannelHandlerContext ctx) throws Exception {
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@SuppressWarnings("unchecked")
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T remoteAddress = (T) ctx.channel().remoteAddress();
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// If the remote address is not available yet, defer the decision.
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if (remoteAddress == null) {
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return false;
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}
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// No need to keep this handler in the pipeline anymore because the decision is going to be made now.
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// Also, this will prevent the subsequent events from being handled by this handler.
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ctx.pipeline().remove(this);
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if (accept(ctx, remoteAddress)) {
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channelAccepted(ctx, remoteAddress);
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} else {
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ChannelFuture rejectedFuture = channelRejected(ctx, remoteAddress);
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if (rejectedFuture != null) {
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rejectedFuture.addListener(ChannelFutureListener.CLOSE);
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} else {
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ctx.close();
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}
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}
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return true;
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}
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/**
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* This method is called immediately after a {@link io.netty.channel.Channel} gets registered.
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*
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* @return Return true if connections from this IP address and port should be accepted. False otherwise.
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*/
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protected abstract boolean accept(ChannelHandlerContext ctx, T remoteAddress) throws Exception;
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/**
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* This method is called if {@code remoteAddress} gets accepted by
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* {@link #accept(ChannelHandlerContext, SocketAddress)}. You should override it if you would like to handle
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* (e.g. respond to) accepted addresses.
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*/
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@SuppressWarnings("UnusedParameters")
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protected void channelAccepted(ChannelHandlerContext ctx, T remoteAddress) { }
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/**
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* This method is called if {@code remoteAddress} gets rejected by
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* {@link #accept(ChannelHandlerContext, SocketAddress)}. You should override it if you would like to handle
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* (e.g. respond to) rejected addresses.
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*
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* @return A {@link ChannelFuture} if you perform I/O operations, so that
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* the {@link Channel} can be closed once it completes. Null otherwise.
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*/
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@SuppressWarnings("UnusedParameters")
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protected ChannelFuture channelRejected(ChannelHandlerContext ctx, T remoteAddress) {
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return null;
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}
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}
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@ -0,0 +1,36 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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import java.net.InetSocketAddress;
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/**
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* Implement this interface to create new rules.
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*/
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public interface IpFilterRule {
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/**
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* @return This method should return true if remoteAddress is valid according to your criteria. False otherwise.
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*/
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boolean matches(InetSocketAddress remoteAddress);
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/**
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* @return This method should return {@link IpFilterRuleType#Accept} if all
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* {@link IpFilterRule#matches(InetSocketAddress)} for which {@link #matches(InetSocketAddress)}
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* returns true should the accepted. If you want to exclude all of those IP addresses then
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* {@link IpFilterRuleType#Reject} should be returned.
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*/
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IpFilterRuleType ruleType();
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}
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@ -0,0 +1,24 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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/**
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* Used in {@link IpFilterRule} to decide if a matching IP Address should be allowed or denied to connect.
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*/
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public enum IpFilterRuleType {
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Accept,
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Reject
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}
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@ -0,0 +1,169 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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import java.math.BigInteger;
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import java.net.Inet4Address;
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import java.net.Inet6Address;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.net.UnknownHostException;
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/**
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* Use this class to create rules for {@link RuleBasedIpFilter} that group IP addresses into subnets.
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* Supports both, IPv4 and IPv6.
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*/
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public final class IpSubnetFilterRule implements IpFilterRule {
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private final IpFilterRule filterRule;
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public IpSubnetFilterRule(String ipAddress, int cidrPrefix, IpFilterRuleType ruleType) {
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try {
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filterRule = selectFilterRule(InetAddress.getByName(ipAddress), cidrPrefix, ruleType);
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} catch (UnknownHostException e) {
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throw new IllegalArgumentException("ipAddress", e);
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}
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}
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public IpSubnetFilterRule(InetAddress ipAddress, int cidrPrefix, IpFilterRuleType ruleType) {
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filterRule = selectFilterRule(ipAddress, cidrPrefix, ruleType);
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}
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private static IpFilterRule selectFilterRule(InetAddress ipAddress, int cidrPrefix, IpFilterRuleType ruleType) {
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if (ipAddress == null) {
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throw new NullPointerException("ipAddress");
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}
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if (ruleType == null) {
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throw new NullPointerException("ruleType");
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}
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if (ipAddress instanceof Inet4Address) {
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return new Ip4SubnetFilterRule((Inet4Address) ipAddress, cidrPrefix, ruleType);
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} else if (ipAddress instanceof Inet6Address) {
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return new Ip6SubnetFilterRule((Inet6Address) ipAddress, cidrPrefix, ruleType);
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} else {
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throw new IllegalArgumentException("Only IPv4 and IPv6 addresses are supported");
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}
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}
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@Override
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public boolean matches(InetSocketAddress remoteAddress) {
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return filterRule.matches(remoteAddress);
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}
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@Override
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public IpFilterRuleType ruleType() {
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return filterRule.ruleType();
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}
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private static final class Ip4SubnetFilterRule implements IpFilterRule {
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private final int networkAddress;
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private final int subnetMask;
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private final IpFilterRuleType ruleType;
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private Ip4SubnetFilterRule(Inet4Address ipAddress, int cidrPrefix, IpFilterRuleType ruleType) {
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if (cidrPrefix < 0 || cidrPrefix > 32) {
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throw new IllegalArgumentException(String.format("IPv4 requires the subnet prefix to be in range of " +
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"[0,32]. The prefix was: %d", cidrPrefix));
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}
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subnetMask = prefixToSubnetMask(cidrPrefix);
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networkAddress = ipToInt(ipAddress) & subnetMask;
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this.ruleType = ruleType;
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}
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@Override
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public boolean matches(InetSocketAddress remoteAddress) {
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int ipAddress = ipToInt((Inet4Address) remoteAddress.getAddress());
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return (ipAddress & subnetMask) == networkAddress;
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}
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@Override
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public IpFilterRuleType ruleType() {
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return ruleType;
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}
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private static int ipToInt(Inet4Address ipAddress) {
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byte[] octets = ipAddress.getAddress();
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assert octets.length == 4;
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return (octets[0] & 0xff) << 24 |
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(octets[1] & 0xff) << 16 |
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(octets[2] & 0xff) << 8 |
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octets[3] & 0xff;
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}
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private static int prefixToSubnetMask(int cidrPrefix) {
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/**
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* Perform the shift on a long and downcast it to int afterwards.
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* This is necessary to handle a cidrPrefix of zero correctly.
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* The left shift operator on an int only uses the five least
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* significant bits of the right-hand operand. Thus -1 << 32 evaluates
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* to -1 instead of 0. The left shift operator applied on a long
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* uses the six least significant bits.
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*
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* Also see https://github.com/netty/netty/issues/2767
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*/
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return (int) ((-1L << 32 - cidrPrefix) & 0xffffffff);
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}
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}
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private static final class Ip6SubnetFilterRule implements IpFilterRule {
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private static final BigInteger MINUS_ONE = BigInteger.valueOf(-1);
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private final BigInteger networkAddress;
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private final BigInteger subnetMask;
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private final IpFilterRuleType ruleType;
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private Ip6SubnetFilterRule(Inet6Address ipAddress, int cidrPrefix, IpFilterRuleType ruleType) {
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if (cidrPrefix < 0 || cidrPrefix > 128) {
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throw new IllegalArgumentException(String.format("IPv6 requires the subnet prefix to be in range of " +
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"[0,128]. The prefix was: %d", cidrPrefix));
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}
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subnetMask = prefixToSubnetMask(cidrPrefix);
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networkAddress = ipToInt(ipAddress).and(subnetMask);
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this.ruleType = ruleType;
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}
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@Override
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public boolean matches(InetSocketAddress remoteAddress) {
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BigInteger ipAddress = ipToInt((Inet6Address) remoteAddress.getAddress());
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return ipAddress.and(subnetMask).equals(networkAddress);
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}
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@Override
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public IpFilterRuleType ruleType() {
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return ruleType;
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}
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private static BigInteger ipToInt(Inet6Address ipAddress) {
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byte[] octets = ipAddress.getAddress();
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assert octets.length == 16;
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return new BigInteger(octets);
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}
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private static BigInteger prefixToSubnetMask(int cidrPrefix) {
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return MINUS_ONE.shiftLeft(128 - cidrPrefix);
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}
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}
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}
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@ -0,0 +1,60 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelHandler.Sharable;
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import io.netty.channel.ChannelHandlerContext;
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import java.net.InetSocketAddress;
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import java.net.SocketAddress;
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/**
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* This class allows one to filter new {@link Channel}s based on the
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* {@link IpFilterRule}s passed to its constructor. If no rules are provided, all connections
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* will be accepted.
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*
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* If you would like to explicitly take action on rejected {@link Channel}s, you should override
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* {@link #channelRejected(ChannelHandlerContext, SocketAddress)}.
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*/
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@Sharable
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public class RuleBasedIpFilter extends AbstractRemoteAddressFilter<InetSocketAddress> {
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private final IpFilterRule[] rules;
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public RuleBasedIpFilter(IpFilterRule... rules) {
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if (rules == null) {
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throw new NullPointerException("rules");
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}
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this.rules = rules;
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}
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@Override
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protected boolean accept(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) throws Exception {
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for (IpFilterRule rule : rules) {
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if (rule == null) {
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break;
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}
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if (rule.matches(remoteAddress)) {
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return rule.ruleType() == IpFilterRuleType.Accept;
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}
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}
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return true;
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}
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}
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@ -0,0 +1,54 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
|
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
|
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
|
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
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* License for the specific language governing permissions and limitations
|
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* under the License.
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*/
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package io.netty.handler.ipfilter;
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import io.netty.channel.Channel;
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import io.netty.channel.ChannelFuture;
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import io.netty.channel.ChannelFutureListener;
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import io.netty.channel.ChannelHandler;
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import io.netty.channel.ChannelHandlerContext;
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import io.netty.util.internal.ConcurrentSet;
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import java.net.InetAddress;
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import java.net.InetSocketAddress;
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import java.util.Set;
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/**
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* This class allows one to ensure that at all times for every IP address there is at most one
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* {@link Channel} connected to the server.
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*/
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@ChannelHandler.Sharable
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public class UniqueIpFilter extends AbstractRemoteAddressFilter<InetSocketAddress> {
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private final Set<InetAddress> connected = new ConcurrentSet<InetAddress>();
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@Override
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protected boolean accept(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) throws Exception {
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final InetAddress remoteIp = remoteAddress.getAddress();
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if (connected.contains(remoteIp)) {
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return false;
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} else {
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connected.add(remoteIp);
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ctx.channel().closeFuture().addListener(new ChannelFutureListener() {
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@Override
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public void operationComplete(ChannelFuture future) throws Exception {
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connected.remove(remoteIp);
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}
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});
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return true;
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}
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}
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}
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@ -0,0 +1,20 @@
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/*
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* Copyright 2014 The Netty Project
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*
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* The Netty Project 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:
|
||||
*
|
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* http://www.apache.org/licenses/LICENSE-2.0
|
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*
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* 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.
|
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*/
|
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/**
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* Package to filter IP addresses (allow/deny).
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*/
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package io.netty.handler.ipfilter;
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@ -0,0 +1,143 @@
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/*
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||||
* Copyright 2014 The Netty Project
|
||||
*
|
||||
* The Netty Project 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 io.netty.handler.ipfilter;
|
||||
|
||||
import io.netty.buffer.ByteBuf;
|
||||
import io.netty.buffer.Unpooled;
|
||||
import io.netty.channel.ChannelFuture;
|
||||
import io.netty.channel.ChannelHandler;
|
||||
import io.netty.channel.ChannelHandlerContext;
|
||||
import io.netty.channel.embedded.EmbeddedChannel;
|
||||
import org.junit.Assert;
|
||||
import org.junit.Test;
|
||||
|
||||
import java.net.InetSocketAddress;
|
||||
import java.net.SocketAddress;
|
||||
|
||||
public class IpSubnetFilterTest {
|
||||
|
||||
@Test
|
||||
public void testIpv4DefaultRoute() {
|
||||
IpSubnetFilterRule rule = new IpSubnetFilterRule("0.0.0.0", 0, IpFilterRuleType.Accept);
|
||||
Assert.assertTrue(rule.matches(newSockAddress("91.114.240.43")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("10.0.0.3")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("192.168.93.2")));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testIp4SubnetFilterRule() throws Exception {
|
||||
IpSubnetFilterRule rule = new IpSubnetFilterRule("192.168.56.1", 24, IpFilterRuleType.Accept);
|
||||
for (int i = 0; i <= 255; i++) {
|
||||
Assert.assertTrue(rule.matches(newSockAddress(String.format("192.168.56.%d", i))));
|
||||
}
|
||||
Assert.assertFalse(rule.matches(newSockAddress("192.168.57.1")));
|
||||
|
||||
rule = new IpSubnetFilterRule("91.114.240.1", 23, IpFilterRuleType.Accept);
|
||||
Assert.assertTrue(rule.matches(newSockAddress("91.114.240.43")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("91.114.240.255")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("91.114.241.193")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("91.114.241.254")));
|
||||
Assert.assertFalse(rule.matches(newSockAddress("91.115.241.2")));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testIp6SubnetFilterRule() {
|
||||
IpSubnetFilterRule rule;
|
||||
|
||||
rule = new IpSubnetFilterRule("2001:db8:abcd:0000::", 52, IpFilterRuleType.Accept);
|
||||
Assert.assertTrue(rule.matches(newSockAddress("2001:db8:abcd:0000::1")));
|
||||
Assert.assertTrue(rule.matches(newSockAddress("2001:db8:abcd:0fff:ffff:ffff:ffff:ffff")));
|
||||
Assert.assertFalse(rule.matches(newSockAddress("2001:db8:abcd:1000::")));
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testIpFilterRuleHandler() throws Exception {
|
||||
IpFilterRule filter0 = new IpFilterRule() {
|
||||
@Override
|
||||
public boolean matches(InetSocketAddress remoteAddress) {
|
||||
return "192.168.57.1".equals(remoteAddress.getHostName());
|
||||
}
|
||||
|
||||
@Override
|
||||
public IpFilterRuleType ruleType() {
|
||||
return IpFilterRuleType.Reject;
|
||||
}
|
||||
};
|
||||
|
||||
RuleBasedIpFilter denyHandler = new RuleBasedIpFilter(filter0) {
|
||||
private final byte[] message = {1, 2, 3, 4, 5, 6, 7};
|
||||
|
||||
@Override
|
||||
protected ChannelFuture channelRejected(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) {
|
||||
Assert.assertTrue(ctx.channel().isActive());
|
||||
Assert.assertTrue(ctx.channel().isWritable());
|
||||
Assert.assertEquals("192.168.57.1", remoteAddress.getHostName());
|
||||
|
||||
return ctx.writeAndFlush(Unpooled.wrappedBuffer(message));
|
||||
}
|
||||
};
|
||||
EmbeddedChannel chDeny = newEmbeddedInetChannel("192.168.57.1", denyHandler);
|
||||
ByteBuf out = (ByteBuf) chDeny.readOutbound();
|
||||
Assert.assertEquals(7, out.readableBytes());
|
||||
for (byte i = 1; i <= 7; i++) {
|
||||
Assert.assertEquals(i, out.readByte());
|
||||
}
|
||||
Assert.assertFalse(chDeny.isActive());
|
||||
Assert.assertFalse(chDeny.isOpen());
|
||||
|
||||
RuleBasedIpFilter allowHandler = new RuleBasedIpFilter(filter0) {
|
||||
@Override
|
||||
protected ChannelFuture channelRejected(ChannelHandlerContext ctx, InetSocketAddress remoteAddress) {
|
||||
Assert.fail();
|
||||
return null;
|
||||
}
|
||||
};
|
||||
EmbeddedChannel chAllow = newEmbeddedInetChannel("192.168.57.2", allowHandler);
|
||||
Assert.assertTrue(chAllow.isActive());
|
||||
Assert.assertTrue(chAllow.isOpen());
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testUniqueIpFilterHandler() {
|
||||
UniqueIpFilter handler = new UniqueIpFilter();
|
||||
|
||||
EmbeddedChannel ch1 = newEmbeddedInetChannel("91.92.93.1", handler);
|
||||
Assert.assertTrue(ch1.isActive());
|
||||
EmbeddedChannel ch2 = newEmbeddedInetChannel("91.92.93.2", handler);
|
||||
Assert.assertTrue(ch2.isActive());
|
||||
EmbeddedChannel ch3 = newEmbeddedInetChannel("91.92.93.1", handler);
|
||||
Assert.assertFalse(ch3.isActive());
|
||||
|
||||
// false means that no data is left to read/write
|
||||
Assert.assertFalse(ch1.finish());
|
||||
|
||||
EmbeddedChannel ch4 = newEmbeddedInetChannel("91.92.93.1", handler);
|
||||
Assert.assertTrue(ch4.isActive());
|
||||
}
|
||||
|
||||
private static EmbeddedChannel newEmbeddedInetChannel(final String ipAddress, ChannelHandler... handlers) {
|
||||
return new EmbeddedChannel(handlers) {
|
||||
@Override
|
||||
protected SocketAddress remoteAddress0() {
|
||||
return isActive()? new InetSocketAddress(ipAddress, 5421) : null;
|
||||
}
|
||||
};
|
||||
}
|
||||
|
||||
private static InetSocketAddress newSockAddress(String ipAddress) {
|
||||
return new InetSocketAddress(ipAddress, 1234);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue
Block a user