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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.tomcat.websocket;
import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Map;
import org.apache.tomcat.util.security.MD5Encoder;
/**
* Authenticator supporting the DIGEST authentication method.
*/
public class DigestAuthenticator extends Authenticator {
public static final String schemeName = "digest";
private static final Object cnonceGeneratorLock = new Object();
private static volatile SecureRandom cnonceGenerator;
private int nonceCount = 0;
private long cNonce;
@Override
public String getAuthorization(String requestUri, String authenticateHeader, String userName, String userPassword,
String userRealm) throws AuthenticationException {
validateUsername(userName);
validatePassword(userPassword);
Map<String, String> parameterMap = parseAuthenticateHeader(authenticateHeader);
String realm = parameterMap.get("realm");
validateRealm(userRealm, realm);
String nonce = parameterMap.get("nonce");
String messageQop = parameterMap.get("qop");
String algorithm = parameterMap.get("algorithm") == null ? "MD5" : parameterMap.get("algorithm");
String opaque = parameterMap.get("opaque");
StringBuilder challenge = new StringBuilder();
if (!messageQop.isEmpty()) {
if (cnonceGenerator == null) {
synchronized(cnonceGeneratorLock) {
if (cnonceGenerator == null) {
cnonceGenerator = new SecureRandom();
}
}
}
cNonce = cnonceGenerator.nextLong();
nonceCount++;
}
challenge.append("Digest ");
challenge.append("username =\"" + userName + "\",");
challenge.append("realm=\"" + realm + "\",");
challenge.append("nonce=\"" + nonce + "\",");
challenge.append("uri=\"" + requestUri + "\",");
try {
challenge.append("response=\"" + calculateRequestDigest(requestUri, userName, userPassword,
realm, nonce, messageQop, algorithm) + "\",");
}
catch (NoSuchAlgorithmException e) {
throw new AuthenticationException(
"Unable to generate request digest " + e.getMessage());
}
challenge.append("algorithm=" + algorithm + ",");
challenge.append("opaque=\"" + opaque + "\",");
if (!messageQop.isEmpty()) {
challenge.append("qop=\"" + messageQop + "\"");
challenge.append(",cnonce=\"" + cNonce + "\",");
challenge.append("nc=" + String.format("%08X", Integer.valueOf(nonceCount)));
}
return challenge.toString();
}
private String calculateRequestDigest(String requestUri, String userName, String password,
String realm, String nonce, String qop, String algorithm)
throws NoSuchAlgorithmException {
StringBuilder preDigest = new StringBuilder();
String A1;
if (algorithm.equalsIgnoreCase("MD5")) {
A1 = userName + ":" + realm + ":" + password;
} else {
A1 = encodeMD5(userName + ":" + realm + ":" + password) + ":" + nonce + ":" + cNonce;
}
/*
* If the "qop" value is "auth-int", then A2 is: A2 = Method ":"
* digest-uri-value ":" H(entity-body) since we do not have an entity-body, A2 =
* Method ":" digest-uri-value for auth and auth_int
*/
String A2 = "GET:" + requestUri;
preDigest.append(encodeMD5(A1));
preDigest.append(':');
preDigest.append(nonce);
if (qop.toLowerCase().contains("auth")) {
preDigest.append(':');
preDigest.append(String.format("%08X", Integer.valueOf(nonceCount)));
preDigest.append(':');
preDigest.append(String.valueOf(cNonce));
preDigest.append(':');
preDigest.append(qop);
}
preDigest.append(':');
preDigest.append(encodeMD5(A2));
return encodeMD5(preDigest.toString());
}
private String encodeMD5(String value) throws NoSuchAlgorithmException {
byte[] bytesOfMessage = value.getBytes(StandardCharsets.ISO_8859_1);
MessageDigest md = MessageDigest.getInstance("MD5");
byte[] thedigest = md.digest(bytesOfMessage);
return MD5Encoder.encode(thedigest);
}
@Override
public String getSchemeName() {
return schemeName;
}
}
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