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/*
* $HeadURL$
* $Revision$
* $Date$
*
* ====================================================================
* 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.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
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*/
package org.apache.http.impl.cookie;
import java.util.Collection;
import java.util.HashSet;
import java.util.Set;
import org.apache.http.client.utils.Punycode;
import org.apache.http.cookie.Cookie;
import org.apache.http.cookie.CookieAttributeHandler;
import org.apache.http.cookie.CookieOrigin;
import org.apache.http.cookie.MalformedCookieException;
import org.apache.http.cookie.SetCookie;
/**
* Wraps a CookieAttributeHandler and leverages its match method
* to never match a suffix from a black list. May be used to provide
* additional security for cross-site attack types by preventing
* cookies from apparent domains that are not publicly available.
* An uptodate list of suffixes can be obtained from
* publicsuffix.org
*
* @since 4.0
*/
public class PublicSuffixFilter implements CookieAttributeHandler {
private final CookieAttributeHandler wrapped;
private Set exceptions;
private Set suffixes;
public PublicSuffixFilter(CookieAttributeHandler wrapped) {
this.wrapped = wrapped;
}
/**
* Sets the suffix blacklist patterns.
* A pattern can be "com", "*.jp"
* TODO add support for patterns like "lib.*.us"
* @param suffixes
*/
public void setPublicSuffixes(Collection suffixes) {
this.suffixes = new HashSet(suffixes);
}
/**
* Sets the exceptions from the blacklist. Exceptions can not be patterns.
* TODO add support for patterns
* @param exceptions
*/
public void setExceptions(Collection exceptions) {
this.exceptions = new HashSet(exceptions);
}
/**
* Never matches if the cookie's domain is from the blacklist.
*/
public boolean match(Cookie cookie, CookieOrigin origin) {
if (isForPublicSuffix(cookie)) return false;
return wrapped.match(cookie, origin);
}
public void parse(SetCookie cookie, String value) throws MalformedCookieException {
wrapped.parse(cookie, value);
}
public void validate(Cookie cookie, CookieOrigin origin) throws MalformedCookieException {
wrapped.validate(cookie, origin);
}
private boolean isForPublicSuffix(Cookie cookie) {
String domain = cookie.getDomain();
if (domain.startsWith(".")) domain = domain.substring(1);
domain = Punycode.toUnicode(domain);
// An exception rule takes priority over any other matching rule.
if (this.exceptions != null) {
if (this.exceptions.contains(domain)) return false;
}
if (this.suffixes == null) return false;
do {
if (this.suffixes.contains(domain)) return true;
// patterns
if (domain.startsWith("*.")) domain = domain.substring(2);
int nextdot = domain.indexOf('.');
if (nextdot == -1) break;
domain = "*" + domain.substring(nextdot);
} while (domain.length() > 0);
return false;
}
}