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/*
* JBoss, Home of Professional Open Source.
* Copyright 2012, Red Hat, Inc., and individual contributors
* as indicated by the @author tags. See the copyright.txt file in the
* distribution for a full listing of individual contributors.
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1 of
* the License, or (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this software; if not, write to the Free
* Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA, or see the FSF site: http://www.fsf.org.
*/
package org.picketlink.authentication.web.support;
import java.security.MessageDigest;
import org.picketlink.idm.credential.Digest;
/**
* Utility class to support HTTP Digest Authentication
*
* @author anil saldhana
* @since July 5, 2012
*/
public class HTTPDigestUtil {
private static final String UTF8 = "UTF-8";
private static final String MD5_ALGORITHM = "MD5";
/**
* Given the standard client response in HTTP/Digest mechanism, generate a set of string tokens that retains the quotes
*
* @param clientResponse
* @return
*/
public static String[] quoteTokenize(String clientResponse) {
if (clientResponse == null)
throw new IllegalArgumentException("Null client response.");
// Derived from http://issues.apache.org/bugzilla/show_bug.cgi?id=37132
return clientResponse.split(",(?=(?:[^\"]*\"[^\"]*\")+$)");
}
/**
* @param token
* @return
*/
public static String userName(String token) {
if (token.startsWith("Digest")) {
token = token.substring(7).trim();
}
return extract(token, "username=");
}
/**
* 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;
}
/**
* Construct a {@link DigestHolder} from the tokens
*
* @param tokens
* @return
*/
public static Digest digest(String[] tokens) {
String username = null, realm = null, nonce = null, uri = null, qop = null, nc = null, cnonce = null, clientResponse = null, opaque = null, domain = null, stale = "false";
int len = tokens.length;
for (int i = 0; i < len; i++) {
String token = tokens[i].trim();
if (token.startsWith("Digest") || token.startsWith("username=")) {
username = HTTPDigestUtil.userName(token);
} else if (token.startsWith("realm")) {
realm = HTTPDigestUtil.extract(token, "realm=");
} else if (token.startsWith("nonce")) {
nonce = HTTPDigestUtil.extract(token, "nonce=");
} else if (token.startsWith("uri")) {
uri = HTTPDigestUtil.extract(token, "uri=");
} else if (token.startsWith("qop")) {
qop = HTTPDigestUtil.extract(token, "qop=");
} else if (token.startsWith("nc")) {
nc = HTTPDigestUtil.extract(token, "nc=");
} else if (token.startsWith("cnonce")) {
cnonce = HTTPDigestUtil.extract(token, "cnonce=");
} else if (token.startsWith("response")) {
clientResponse = HTTPDigestUtil.extract(token, "response=");
} else if (token.startsWith("opaque")) {
opaque = HTTPDigestUtil.extract(token, "opaque=");
} else if (token.startsWith("domain")) {
domain = HTTPDigestUtil.extract(token, "domain=");
} else if (token.startsWith("stale")) {
stale = HTTPDigestUtil.extract(token, "stale=");
}
}
// Construct a digest holder
Digest digestHolder = new Digest();
digestHolder.setUsername(username).setRealm(realm).setNonce(nonce).setUri(uri).setQop(qop).setNonceCount(nc).setClientNonce(cnonce)
.setDigest(clientResponse).setOpaque(opaque);
digestHolder.setStale(stale).setDomain(domain);
return digestHolder;
}
/**
* Determine the message digest
*
* @param str
* @return
* @throws FormatException
*/
public static byte[] md5(String str) {
try {
MessageDigest md = MessageDigest.getInstance(MD5_ALGORITHM);
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 clientResponseValue(Digest digest, char[] password) {
try {
MessageDigest messageDigest = MessageDigest.getInstance(MD5_ALGORITHM);
byte[] ha1;
// A1 digest
messageDigest.update(digest.getUsername().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getRealm().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(new String(password).getBytes(UTF8));
ha1 = messageDigest.digest();
// A2 digest
messageDigest.reset();
messageDigest.update(digest.getMethod().getBytes(UTF8));
messageDigest.update((byte) ':');
messageDigest.update(digest.getUri().getBytes(UTF8));
byte[] ha2 = messageDigest.digest();
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);
}
}
/**
* 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 clientResponseValue(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();
}
}
