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/*
* 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.zookeeper.server.auth;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.StringTokenizer;
import javax.servlet.http.HttpServletRequest;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.data.Id;
import org.apache.zookeeper.server.ServerCnxn;
public class IPAuthenticationProvider implements AuthenticationProvider {
public static final String X_FORWARDED_FOR_HEADER_NAME = "X-Forwarded-For";
public String getScheme() {
return "ip";
}
public KeeperException.Code handleAuthentication(ServerCnxn cnxn, byte[] authData) {
String id = cnxn.getRemoteSocketAddress().getAddress().getHostAddress();
cnxn.addAuthInfo(new Id(getScheme(), id));
return KeeperException.Code.OK;
}
@Override
public List<Id> handleAuthentication(HttpServletRequest request, byte[] authData) {
final List<Id> ids = new ArrayList<>();
final String ip = getClientIPAddress(request);
ids.add(new Id(getScheme(), ip));
return Collections.unmodifiableList(ids);
}
// This is a bit weird but we need to return the address and the number of
// bytes (to distinguish between IPv4 and IPv6
private byte[] addr2Bytes(String addr) {
byte[] b = v4addr2Bytes(addr);
// TODO Write the v6addr2Bytes
return b;
}
private byte[] v4addr2Bytes(String addr) {
String[] parts = addr.split("\\.", -1);
if (parts.length != 4) {
return null;
}
byte[] b = new byte[4];
for (int i = 0; i < 4; i++) {
try {
int v = Integer.parseInt(parts[i]);
if (v >= 0 && v <= 255) {
b[i] = (byte) v;
} else {
return null;
}
} catch (NumberFormatException e) {
return null;
}
}
return b;
}
private void mask(byte[] b, int bits) {
int start = bits / 8;
int startMask = (1 << (8 - (bits % 8))) - 1;
startMask = ~startMask;
while (start < b.length) {
b[start] &= startMask;
startMask = 0;
start++;
}
}
public boolean matches(String id, String aclExpr) {
String[] parts = aclExpr.split("/", 2);
byte[] aclAddr = addr2Bytes(parts[0]);
if (aclAddr == null) {
return false;
}
int bits = aclAddr.length * 8;
if (parts.length == 2) {
try {
bits = Integer.parseInt(parts[1]);
if (bits < 0 || bits > aclAddr.length * 8) {
return false;
}
} catch (NumberFormatException e) {
return false;
}
}
mask(aclAddr, bits);
byte[] remoteAddr = addr2Bytes(id);
if (remoteAddr == null) {
return false;
}
mask(remoteAddr, bits);
for (int i = 0; i < remoteAddr.length; i++) {
if (remoteAddr[i] != aclAddr[i]) {
return false;
}
}
return true;
}
public boolean isAuthenticated() {
return false;
}
public boolean isValid(String id) {
String[] parts = id.split("/", 2);
byte[] aclAddr = addr2Bytes(parts[0]);
if (aclAddr == null) {
return false;
}
if (parts.length == 2) {
try {
int bits = Integer.parseInt(parts[1]);
if (bits < 0 || bits > aclAddr.length * 8) {
return false;
}
} catch (NumberFormatException e) {
return false;
}
}
return true;
}
/**
* Returns the HTTP(s) client IP address
* @param request HttpServletRequest
* @return IP address
*/
public static String getClientIPAddress(final HttpServletRequest request) {
// to handle the case that a HTTP(s) client connects via a proxy or load balancer
final String xForwardedForHeader = request.getHeader(X_FORWARDED_FOR_HEADER_NAME);
if (xForwardedForHeader == null) {
return request.getRemoteAddr();
}
// the format of the field is: X-Forwarded-For: client, proxy1, proxy2 ...
return new StringTokenizer(xForwardedForHeader, ",").nextToken().trim();
}
}
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