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/*
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* Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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*/
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package java.net.http;
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import java.io.IOException;
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import static java.net.Authenticator.RequestorType.PROXY;
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import static java.net.Authenticator.RequestorType.SERVER;
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import java.net.PasswordAuthentication;
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import java.net.URI;
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import java.net.InetSocketAddress;
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import java.net.URISyntaxException;
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import java.util.Base64;
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import java.util.HashMap;
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import java.util.LinkedList;
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import static java.nio.charset.StandardCharsets.ISO_8859_1;
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/**
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* Implementation of Http Basic authentication.
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*/
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class AuthenticationFilter implements HeaderFilter {
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static private final Base64.Encoder encoder = Base64.getEncoder();
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static final int DEFAULT_RETRY_LIMIT = 3;
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static final int retry_limit = Utils.getIntegerNetProperty(
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"sun.net.httpclient.auth.retrylimit", DEFAULT_RETRY_LIMIT);
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static final int UNAUTHORIZED = 401;
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static final int PROXY_UNAUTHORIZED = 407;
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private PasswordAuthentication getCredentials(String header,
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boolean proxy,
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HttpRequestImpl req)
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throws IOException
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{
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HttpClientImpl client = req.client();
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java.net.Authenticator auth =
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client.authenticator()
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.orElseThrow(() -> new IOException("No authenticator set"));
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URI uri = req.uri();
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HeaderParser parser = new HeaderParser(header);
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String authscheme = parser.findKey(0);
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String realm = parser.findValue("realm");
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java.net.Authenticator.RequestorType rtype = proxy ? PROXY : SERVER;
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// needs to be instance method in Authenticator
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return auth.requestPasswordAuthenticationInstance(uri.getHost(),
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null,
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uri.getPort(),
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uri.getScheme(),
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realm,
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authscheme,
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uri.toURL(),
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rtype
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);
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}
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private URI getProxyURI(HttpRequestImpl r) {
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InetSocketAddress proxy = r.proxy();
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if (proxy == null) {
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return null;
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}
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// our own private scheme for proxy URLs
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// eg. proxy.http://host:port/
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String scheme = "proxy." + r.uri().getScheme();
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try {
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return new URI(scheme,
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null,
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proxy.getHostString(),
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proxy.getPort(),
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null,
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null,
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null);
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} catch (URISyntaxException e) {
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throw new InternalError(e);
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}
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}
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@Override
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public void request(HttpRequestImpl r) throws IOException {
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// use preemptive authentication if an entry exists.
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Cache cache = getCache(r);
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// Proxy
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if (r.exchange.proxyauth == null) {
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URI proxyURI = getProxyURI(r);
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if (proxyURI != null) {
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CacheEntry ca = cache.get(proxyURI, true);
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if (ca != null) {
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r.exchange.proxyauth = new AuthInfo(true, ca.scheme, null, ca);
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addBasicCredentials(r, true, ca.value);
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}
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}
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}
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// Server
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if (r.exchange.serverauth == null) {
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CacheEntry ca = cache.get(r.uri(), false);
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if (ca != null) {
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r.exchange.serverauth = new AuthInfo(true, ca.scheme, null, ca);
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addBasicCredentials(r, false, ca.value);
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}
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}
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}
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// TODO: refactor into per auth scheme class
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static private void addBasicCredentials(HttpRequestImpl r,
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boolean proxy,
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PasswordAuthentication pw) {
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String hdrname = proxy ? "Proxy-Authorization" : "Authorization";
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StringBuilder sb = new StringBuilder(128);
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sb.append(pw.getUserName()).append(':').append(pw.getPassword());
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String s = encoder.encodeToString(sb.toString().getBytes(ISO_8859_1));
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String value = "Basic " + s;
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r.setSystemHeader(hdrname, value);
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}
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// Information attached to a HttpRequestImpl relating to authentication
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static class AuthInfo {
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final boolean fromcache;
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final String scheme;
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int retries;
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PasswordAuthentication credentials; // used in request
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CacheEntry cacheEntry; // if used
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AuthInfo(boolean fromcache,
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String scheme,
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PasswordAuthentication credentials) {
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this.fromcache = fromcache;
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this.scheme = scheme;
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this.credentials = credentials;
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this.retries = 1;
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}
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AuthInfo(boolean fromcache,
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String scheme,
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PasswordAuthentication credentials,
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CacheEntry ca) {
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this(fromcache, scheme, credentials);
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assert credentials == null || (ca != null && ca.value == null);
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cacheEntry = ca;
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}
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}
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@Override
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public HttpRequestImpl response(HttpResponseImpl r) throws IOException {
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Cache cache = getCache(r.request);
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int status = r.statusCode();
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HttpHeaders hdrs = r.headers();
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HttpRequestImpl req = r.request();
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if (status != UNAUTHORIZED && status != PROXY_UNAUTHORIZED) {
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// check if any authentication succeeded for first time
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if (req.exchange.serverauth != null && !req.exchange.serverauth.fromcache) {
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AuthInfo au = req.exchange.serverauth;
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cache.store(au.scheme, req.uri(), false, au.credentials);
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}
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if (req.exchange.proxyauth != null && !req.exchange.proxyauth.fromcache) {
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AuthInfo au = req.exchange.proxyauth;
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cache.store(au.scheme, req.uri(), false, au.credentials);
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}
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return null;
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}
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boolean proxy = status == PROXY_UNAUTHORIZED;
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String authname = proxy ? "Proxy-Authentication" : "WWW-Authenticate";
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String authval = hdrs.firstValue(authname).orElseThrow(() -> {
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return new IOException("Invalid auth header");
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});
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HeaderParser parser = new HeaderParser(authval);
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String scheme = parser.findKey(0);
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// TODO: Need to generalise from Basic only. Delegate to a provider class etc.
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if (!scheme.equalsIgnoreCase("Basic")) {
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return null; // error gets returned to app
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}
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String realm = parser.findValue("realm");
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AuthInfo au = proxy ? req.exchange.proxyauth : req.exchange.serverauth;
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if (au == null) {
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PasswordAuthentication pw = getCredentials(authval, proxy, req);
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if (pw == null) {
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throw new IOException("No credentials provided");
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}
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// No authentication in request. Get credentials from user
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au = new AuthInfo(false, "Basic", pw);
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if (proxy)
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req.exchange.proxyauth = au;
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else
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req.exchange.serverauth = au;
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addBasicCredentials(req, proxy, pw);
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return req;
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} else if (au.retries > retry_limit) {
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throw new IOException("too many authentication attempts");
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} else {
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// we sent credentials, but they were rejected
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if (au.fromcache) {
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cache.remove(au.cacheEntry);
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}
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// try again
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au.credentials = getCredentials(authval, proxy, req);
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addBasicCredentials(req, proxy, au.credentials);
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au.retries++;
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return req;
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}
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}
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static final HashMap<HttpClientImpl,Cache> caches = new HashMap<>();
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static synchronized Cache getCache(HttpRequestImpl req) {
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HttpClientImpl client = req.client();
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Cache c = caches.get(client);
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if (c == null) {
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c = new Cache();
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caches.put(client, c);
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}
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return c;
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}
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static class Cache {
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final LinkedList<CacheEntry> entries = new LinkedList<>();
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synchronized CacheEntry get(URI uri, boolean proxy) {
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for (CacheEntry entry : entries) {
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if (entry.equalsKey(uri, proxy)) {
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return entry;
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}
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}
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return null;
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}
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synchronized void remove(String authscheme, URI domain, boolean proxy) {
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for (CacheEntry entry : entries) {
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if (entry.equalsKey(domain, proxy)) {
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entries.remove(entry);
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}
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}
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}
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synchronized void remove(CacheEntry entry) {
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entries.remove(entry);
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}
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synchronized void store(String authscheme,
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URI domain,
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boolean proxy,
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PasswordAuthentication value) {
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remove(authscheme, domain, proxy);
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entries.add(new CacheEntry(authscheme, domain, proxy, value));
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}
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}
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static class CacheEntry {
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final String root;
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final String scheme;
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final boolean proxy;
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final PasswordAuthentication value;
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CacheEntry(String authscheme,
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URI uri,
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boolean proxy,
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PasswordAuthentication value) {
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this.scheme = authscheme;
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this.root = uri.resolve(".").toString(); // remove extraneous components
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this.proxy = proxy;
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this.value = value;
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}
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public PasswordAuthentication value() {
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return value;
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}
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public boolean equalsKey(URI uri, boolean proxy) {
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if (this.proxy != proxy) {
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return false;
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}
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String other = uri.toString();
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return other.startsWith(root);
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}
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}
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}
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