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/*
* Conditions Of Use
*
* This software was developed by employees of the National Institute of
* Standards and Technology (NIST), an agency of the Federal Government.
* Pursuant to title 15 Untied States Code Section 105, works of NIST
* employees are not subject to copyright protection in the United States
* and are considered to be in the public domain. As a result, a formal
* license is not needed to use the software.
*
* This software is provided by NIST as a service and is expressly
* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
* AND DATA ACCURACY. NIST does not warrant or make any representations
* regarding the use of the software or the results thereof, including but
* not limited to the correctness, accuracy, reliability or usefulness of
* the software.
*
* Permission to use this software is contingent upon your acceptance
* of the terms of this agreement
*
* .
*
*/
package android.gov.nist.javax.sip.clientauthutils;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Date;
import java.util.Random;
import android.gov.nist.core.InternalErrorHandler;
import android.gov.nist.javax.sip.stack.SIPTransactionStack;
import android.javax.sip.address.URI;
import android.javax.sip.header.AuthorizationHeader;
import android.javax.sip.header.HeaderFactory;
import android.javax.sip.header.ProxyAuthenticateHeader;
import android.javax.sip.header.ProxyAuthorizationHeader;
import android.javax.sip.message.Request;
import android.javax.sip.message.Response;
/**
* Implements the HTTP digest authentication method server side functionality.
*
* @author M. Ranganathan
* @author Marc Bednarek
*/
public class DigestServerAuthenticationHelper {
private MessageDigest messageDigest;
public static final String DEFAULT_ALGORITHM = "MD5";
public static final String DEFAULT_SCHEME = "Digest";
/** to hex converter */
private static final char[] toHex = { '0', '1', '2', '3', '4', '5', '6',
'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
/**
* Default constructor.
* @throws NoSuchAlgorithmException
*/
public DigestServerAuthenticationHelper()
throws NoSuchAlgorithmException {
messageDigest = MessageDigest.getInstance(DEFAULT_ALGORITHM);
}
public static String toHexString(byte b[]) {
int pos = 0;
char[] c = new char[b.length * 2];
for (int i = 0; i < b.length; i++) {
c[pos++] = toHex[(b[i] >> 4) & 0x0F];
c[pos++] = toHex[b[i] & 0x0f];
}
return new String(c);
}
/**
* Generate the challenge string.
*
* @return a generated nonce.
*/
private String generateNonce() {
// Get the time of day and run MD5 over it.
Date date = new Date();
long time = date.getTime();
Random rand = new Random();
long pad = rand.nextLong();
String nonceString = (new Long(time)).toString()
+ (new Long(pad)).toString();
byte mdbytes[] = messageDigest.digest(nonceString.getBytes());
// Convert the mdbytes array into a hex string.
return toHexString(mdbytes);
}
public void generateChallenge(HeaderFactory headerFactory, Response response, String realm ) {
try {
ProxyAuthenticateHeader proxyAuthenticate = headerFactory
.createProxyAuthenticateHeader(DEFAULT_SCHEME);
proxyAuthenticate.setParameter("realm", realm);
proxyAuthenticate.setParameter("nonce", generateNonce());
proxyAuthenticate.setParameter("opaque", "");
proxyAuthenticate.setParameter("stale", "FALSE");
proxyAuthenticate.setParameter("algorithm", DEFAULT_ALGORITHM);
response.setHeader(proxyAuthenticate);
} catch (Exception ex) {
InternalErrorHandler.handleException(ex);
}
}
/**
* Authenticate the inbound request.
*
* @param request - the request to authenticate.
* @param hashedPassword -- the MD5 hashed string of username:realm:plaintext password.
*
* @return true if authentication succeded and false otherwise.
*/
public boolean doAuthenticateHashedPassword(Request request, String hashedPassword) {
ProxyAuthorizationHeader authHeader = (ProxyAuthorizationHeader) request.getHeader(ProxyAuthorizationHeader.NAME);
if ( authHeader == null ) return false;
String realm = authHeader.getRealm();
String username = authHeader.getUsername();
if ( username == null || realm == null ) {
return false;
}
String nonce = authHeader.getNonce();
URI uri = authHeader.getURI();
if (uri == null) {
return false;
}
String A2 = request.getMethod().toUpperCase() + ":" + uri.toString();
String HA1 = hashedPassword;
byte[] mdbytes = messageDigest.digest(A2.getBytes());
String HA2 = toHexString(mdbytes);
String cnonce = authHeader.getCNonce();
String KD = HA1 + ":" + nonce;
if (cnonce != null) {
KD += ":" + cnonce;
}
KD += ":" + HA2;
mdbytes = messageDigest.digest(KD.getBytes());
String mdString = toHexString(mdbytes);
String response = authHeader.getResponse();
return mdString.equals(response);
}
/**
* Authenticate the inbound request given plain text password.
*
* @param request - the request to authenticate.
* @param pass -- the plain text password.
*
* @return true if authentication succeded and false otherwise.
*/
public boolean doAuthenticatePlainTextPassword(Request request, String pass) {
ProxyAuthorizationHeader authHeader = (ProxyAuthorizationHeader) request.getHeader(ProxyAuthorizationHeader.NAME);
if ( authHeader == null ) return false;
String realm = authHeader.getRealm();
String username = authHeader.getUsername();
if ( username == null || realm == null ) {
return false;
}
String nonce = authHeader.getNonce();
URI uri = authHeader.getURI();
if (uri == null) {
return false;
}
String A1 = username + ":" + realm + ":" + pass;
String A2 = request.getMethod().toUpperCase() + ":" + uri.toString();
byte mdbytes[] = messageDigest.digest(A1.getBytes());
String HA1 = toHexString(mdbytes);
mdbytes = messageDigest.digest(A2.getBytes());
String HA2 = toHexString(mdbytes);
String cnonce = authHeader.getCNonce();
String KD = HA1 + ":" + nonce;
if (cnonce != null) {
KD += ":" + cnonce;
}
KD += ":" + HA2;
mdbytes = messageDigest.digest(KD.getBytes());
String mdString = toHexString(mdbytes);
String response = authHeader.getResponse();
return mdString.equals(response);
}
}
