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/*
* JBoss, Home of Professional Open Source
*
* Copyright 2013 Red Hat, Inc. and/or its affiliates.
*
* Licensed 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.picketlink.idm.credential.util;
import org.picketlink.common.util.Base64;
import org.picketlink.idm.credential.Digest;
import org.picketlink.idm.credential.DigestValidationException;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
/**
* Utility class to support Digest Credentials
*
* @author anil saldhana
* @since July 5, 2012
*/
public class DigestUtil {
private static final String UTF8 = "UTF-8";
private static final String MD5_ALGORITHM = "MD5";
/**
* @param token
* @return
*/
public static String userName(String token) {
if (token.startsWith("Digest")) {
token = token.substring(7).trim();
}
return extract(token, "username=");
}
/**
* Determine the message digest
*
* @param str
* @return
* @throws FormatException
*/
public static byte[] md5(String str) {
try {
MessageDigest md = getMessageDigest();
return md.digest(str.getBytes(UTF8));
} catch (Exception e) {
throw new RuntimeException(e);
}
}
/**
* Given the digest, construct the client response value
*
* @param digest
* @param password
* @return
* @throws FormatException
*/
public static String calculate(Digest digest, char[] password) {
try {
MessageDigest messageDigest = getMessageDigest();
byte[] ha1 = calculateA1(digest.getUsername(), digest.getRealm(), password);
byte[] ha2 = calculateA2(digest.getMethod(), digest.getUri());
messageDigest.update(convertBytesToHex(ha1).getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getNonce().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getNonceCount().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getClientNonce().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getQop().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(convertBytesToHex(ha2).getBytes(UTF8));
byte[] digestedValue = messageDigest.digest();
return convertBytesToHex(digestedValue);
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static String calculateDigest(Digest digest, byte[] ha1, byte[] ha2) {
try {
MessageDigest messageDigest = getMessageDigest();
messageDigest.update(convertBytesToHex(ha1).getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getNonce().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getNonceCount().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getClientNonce().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getQop().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(convertBytesToHex(ha2).getBytes(UTF8));
return convertBytesToHex(messageDigest.digest());
} catch (Exception e) {
throw new RuntimeException(e);
}
}
private static MessageDigest getMessageDigest() throws NoSuchAlgorithmException {
return MessageDigest.getInstance(MD5_ALGORITHM);
}
public static byte[] calculateA1(String userName, String realm, char[] password) {
// A1 digest
MessageDigest messageDigest = null;
try {
messageDigest = getMessageDigest();
messageDigest.update(userName.getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(realm.getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(String.valueOf(password).getBytes(UTF8));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Invalid algorithm.", e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("Unsupported encoding.", e);
}
return messageDigest.digest();
}
public static byte[] calculateA2(String method, String uri) {
// A1 digest
MessageDigest messageDigest = null;
try {
messageDigest = getMessageDigest();
messageDigest.update(method.getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(uri.getBytes(UTF8));
} catch (NoSuchAlgorithmException e) {
throw new RuntimeException("Invalid algorithm.", e);
} catch (UnsupportedEncodingException e) {
throw new RuntimeException("Unsupported encoding.", e);
}
return messageDigest.digest();
}
/**
* Match the Client Response value with a generated digest based on the password
*
* @param digest
* @param password
* @return
* @throws FormatException
*/
public static boolean matchCredential(Digest digest, char[] password) {
return calculate(digest, password).equalsIgnoreCase(digest.getDigest());
}
/**
* Convert a byte array to hex
*
* @param bytes
* @return
*/
public static String convertBytesToHex(byte[] bytes) {
int base = 16;
int ALL_ON = 0xff;
StringBuilder buf = new StringBuilder();
for (byte byteValue : bytes) {
int bit = ALL_ON & byteValue;
int c = '0' + (bit / base) % base;
if (c > '9')
c = 'a' + (c - '0' - 10);
buf.append((char) c);
c = '0' + bit % base;
if (c > '9')
c = 'a' + (c - '0' - 10);
buf.append((char) c);
}
return buf.toString();
}
/**
* Given a digest token, extract the value
*
* @param token
* @param key
* @return
*/
public static String extract(String token, String key) {
String result = null;
if (token.startsWith(key)) {
int eq = token.indexOf("=");
result = token.substring(eq + 1);
if (result.startsWith("\"")) {
result = result.substring(1);
}
if (result.endsWith("\"")) {
int len = result.length();
result = result.substring(0, len - 1);
}
}
return result;
}
public void validate(Digest digest, String systemRealm, String key) throws DigestValidationException {
// Check all required parameters were supplied (ie RFC 2069)
if (digest.getRealm() == null)
throw new DigestValidationException("Mandatory field 'realm' not specified");
if (digest.getNonce() == null)
throw new DigestValidationException("Mandatory field 'nonce' not specified");
if (digest.getUri() == null)
throw new DigestValidationException("Mandatory field 'uri' not specified");
if (digest.getClientNonce() == null)
throw new DigestValidationException("Mandatory field 'response' not specified");
// Check all required parameters for an "auth" qop were supplied (ie RFC
// 2617)
if ("auth".equals(digest.getQop())) {
if (digest.getNonceCount() == null) {
throw new DigestValidationException("Mandatory field 'nc' not specified");
}
if (digest.getClientNonce() == null) {
throw new DigestValidationException("Mandatory field 'cnonce' not specified");
}
}
String nonceAsText = new String(Base64.decode(digest.getNonce()));
String[] nonceTokens = nonceAsText.split(":");
if (nonceTokens.length != 2) {
throw new DigestValidationException("Nonce should provide two tokens - nonce received: " + digest.getNonce());
}
// Check realm name equals what we expected
if (!systemRealm.equals(digest.getRealm())) {
throw new DigestValidationException("Realm name [" + digest.getRealm() + "] does not match system realm name ["
+ systemRealm + "]");
}
long nonceExpiry = 0;
try {
nonceExpiry = new Long(nonceTokens[0]).longValue();
} catch (NumberFormatException nfe) {
throw new DigestValidationException("First nonce token should be numeric, but was: " + nonceTokens[0]);
}
// To get this far, the digest must have been valid
// Check the nonce has not expired
// We do this last so we can direct the user agent its nonce is stale
// but the request was otherwise appearing to be valid
if (nonceExpiry < System.currentTimeMillis()) {
throw new DigestValidationException("Nonce has expired", true);
}
String expectedNonceSignature = new String(md5(nonceExpiry + ":" + key));
if (!expectedNonceSignature.equals(nonceTokens[1])) {
throw new DigestValidationException("Nonce token invalid: " + nonceAsText);
}
}
}
