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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.cxf.transport.http.auth;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URL;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import org.apache.cxf.configuration.security.AuthorizationPolicy;
import org.apache.cxf.message.Message;
/**
*
*/
public class DigestAuthSupplier implements HttpAuthSupplier {
private static final char[] HEXADECIMAL = {
'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
final MessageDigest md5Helper;
Map authInfo = new ConcurrentHashMap();
public DigestAuthSupplier() {
MessageDigest md = null;
try {
md = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException e) {
md = null;
}
md5Helper = md;
}
/**
* {@inheritDoc}
* With digest, the nonce could expire and thus a rechallenge will be issued.
* Thus, we need requests cached to be able to handle that
*/
public boolean requiresRequestCaching() {
return true;
}
public String getAuthorization(AuthorizationPolicy authPolicy,
URL currentURL,
Message message,
String fullHeader) {
if (authPolicy.getUserName() == null && authPolicy.getPassword() == null) {
return null;
}
URI currentURI = URI.create(currentURL.toString());
if (fullHeader == null) {
DigestInfo di = authInfo.get(currentURI);
if (di != null) {
/* Preemptive authentication is only possible if we have a cached
* challenge
*/
return di.generateAuth(currentURL.getFile(),
authPolicy.getUserName(),
authPolicy.getPassword());
} else {
return null;
}
}
HttpAuthHeader authHeader = new HttpAuthHeader(fullHeader);
if (authHeader.authTypeIsDigest() && authPolicy != null) {
Map map = authHeader.getParams();
if ("auth".equals(map.get("qop"))
|| !map.containsKey("qop")) {
DigestInfo di = new DigestInfo();
di.qop = map.get("qop");
di.realm = map.get("realm");
di.nonce = map.get("nonce");
di.opaque = map.get("opaque");
if (map.containsKey("algorithm")) {
di.algorithm = map.get("algorithm");
}
if (map.containsKey("charset")) {
di.charset = map.get("charset");
}
di.method = (String)message.get(Message.HTTP_REQUEST_METHOD);
if (di.method == null) {
di.method = "POST";
}
authInfo.put(currentURI, di);
return di.generateAuth(currentURL.getFile(),
authPolicy.getUserName(),
authPolicy.getPassword());
}
}
return null;
}
public String createCnonce() throws UnsupportedEncodingException {
String cnonce = Long.toString(System.currentTimeMillis());
byte[] bytes = cnonce.getBytes("US-ASCII");
synchronized (md5Helper) {
bytes = md5Helper.digest(bytes);
}
return encode(bytes);
}
class DigestInfo {
String qop;
String realm;
String nonce;
String opaque;
int nc;
String algorithm = "MD5";
String charset = "ISO-8859-1";
String method = "POST";
synchronized String generateAuth(String uri, String username, String password) {
try {
nc++;
String ncstring = String.format("%08d", nc);
String cnonce = createCnonce();
String digAlg = algorithm;
if (digAlg.equalsIgnoreCase("MD5-sess")) {
digAlg = "MD5";
}
MessageDigest digester = MessageDigest.getInstance(digAlg);
String a1 = username + ":" + realm + ":" + password;
if ("MD5-sess".equalsIgnoreCase(algorithm)) {
algorithm = "MD5";
String tmp2 = encode(digester.digest(a1.getBytes(charset)));
a1 = tmp2 + ':' + nonce + ':' + cnonce;
}
String hasha1 = encode(digester.digest(a1.getBytes(charset)));
String a2 = method + ":" + uri;
String hasha2 = encode(digester.digest(a2.getBytes("US-ASCII")));
String serverDigestValue = null;
if (qop == null) {
serverDigestValue = hasha1 + ":" + nonce + ":" + hasha2;
} else {
serverDigestValue = hasha1 + ":" + nonce + ":" + ncstring + ":" + cnonce + ":"
+ qop + ":" + hasha2;
}
String response = encode(digester.digest(serverDigestValue.getBytes("US-ASCII")));
Map outParams = new HashMap();
if (qop != null) {
outParams.put("qop", "auth");
}
outParams.put("realm", realm);
outParams.put("opaque", opaque);
outParams.put("nonce", nonce);
outParams.put("uri", uri);
outParams.put("username", username);
outParams.put("nc", ncstring);
outParams.put("cnonce", cnonce);
outParams.put("response", response);
return new HttpAuthHeader(HttpAuthHeader.AUTH_TYPE_DIGEST, outParams).getFullHeader();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}
/**
* Encodes the 128 bit (16 bytes) MD5 digest into a 32 characters long
* String according to RFC 2617.
*
* @param binaryData array containing the digest
* @return encoded MD5, or null if encoding failed
*/
private static String encode(byte[] binaryData) {
int n = binaryData.length;
char[] buffer = new char[n * 2];
for (int i = 0; i < n; i++) {
int low = binaryData[i] & 0x0f;
int high = (binaryData[i] & 0xf0) >> 4;
buffer[i * 2] = HEXADECIMAL[high];
buffer[(i * 2) + 1] = HEXADECIMAL[low];
}
return new String(buffer);
}
}