/*
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* Conditions Of Use
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*
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* This software was developed by employees of the National Institute of
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* Standards and Technology (NIST), an agency of the Federal Government.
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* Pursuant to title 15 Untied States Code Section 105, works of NIST
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* employees are not subject to copyright protection in the United States
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* and are considered to be in the public domain. As a result, a formal
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* license is not needed to use the software.
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*
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* This software is provided by NIST as a service and is expressly
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* provided "AS IS." NIST MAKES NO WARRANTY OF ANY KIND, EXPRESS, IMPLIED
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* OR STATUTORY, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTY OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, NON-INFRINGEMENT
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* AND DATA ACCURACY. NIST does not warrant or make any representations
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* regarding the use of the software or the results thereof, including but
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* not limited to the correctness, accuracy, reliability or usefulness of
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* the software.
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*
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* Permission to use this software is contingent upon your acceptance
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* of the terms of this agreement
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*
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* .
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*
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*/
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package com.genersoft.iot.vmp.gb28181.auth;
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import java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.util.Date;
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import java.util.Random;
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import javax.sip.address.URI;
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import javax.sip.header.AuthorizationHeader;
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import javax.sip.header.HeaderFactory;
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import javax.sip.header.WWWAuthenticateHeader;
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import javax.sip.message.Request;
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import javax.sip.message.Response;
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import gov.nist.core.InternalErrorHandler;
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/**
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* Implements the HTTP digest authentication method server side functionality.
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*
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* @author M. Ranganathan
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* @author Marc Bednarek
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*/
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public class DigestServerAuthenticationHelper {
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private MessageDigest messageDigest;
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public static final String DEFAULT_ALGORITHM = "MD5";
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public static final String DEFAULT_SCHEME = "Digest";
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/** to hex converter */
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private static final char[] toHex = { '0', '1', '2', '3', '4', '5', '6',
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'7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
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/**
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* Default constructor.
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* @throws NoSuchAlgorithmException
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*/
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public DigestServerAuthenticationHelper()
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throws NoSuchAlgorithmException {
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messageDigest = MessageDigest.getInstance(DEFAULT_ALGORITHM);
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}
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public static String toHexString(byte b[]) {
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int pos = 0;
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char[] c = new char[b.length * 2];
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for (int i = 0; i < b.length; i++) {
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c[pos++] = toHex[(b[i] >> 4) & 0x0F];
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c[pos++] = toHex[b[i] & 0x0f];
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}
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return new String(c);
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}
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/**
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* Generate the challenge string.
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*
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* @return a generated nonce.
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*/
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private String generateNonce() {
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// Get the time of day and run MD5 over it.
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Date date = new Date();
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long time = date.getTime();
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Random rand = new Random();
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long pad = rand.nextLong();
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String nonceString = (new Long(time)).toString()
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+ (new Long(pad)).toString();
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byte mdbytes[] = messageDigest.digest(nonceString.getBytes());
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// Convert the mdbytes array into a hex string.
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return toHexString(mdbytes);
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}
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public Response generateChallenge(HeaderFactory headerFactory, Response response, String realm) {
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try {
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WWWAuthenticateHeader proxyAuthenticate = headerFactory
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.createWWWAuthenticateHeader(DEFAULT_SCHEME);
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proxyAuthenticate.setParameter("realm", realm);
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proxyAuthenticate.setParameter("nonce", generateNonce());
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proxyAuthenticate.setParameter("opaque", "");
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proxyAuthenticate.setParameter("stale", "FALSE");
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proxyAuthenticate.setParameter("algorithm", DEFAULT_ALGORITHM);
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response.setHeader(proxyAuthenticate);
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} catch (Exception ex) {
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InternalErrorHandler.handleException(ex);
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}
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return response;
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}
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/**
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* Authenticate the inbound request.
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*
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* @param request - the request to authenticate.
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* @param hashedPassword -- the MD5 hashed string of username:realm:plaintext password.
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*
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* @return true if authentication succeded and false otherwise.
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*/
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public boolean doAuthenticateHashedPassword(Request request, String hashedPassword) {
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AuthorizationHeader authHeader = (AuthorizationHeader) request.getHeader(AuthorizationHeader.NAME);
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if ( authHeader == null ) return false;
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String realm = authHeader.getRealm();
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String username = authHeader.getUsername();
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if ( username == null || realm == null ) {
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return false;
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}
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String nonce = authHeader.getNonce();
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URI uri = authHeader.getURI();
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if (uri == null) {
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return false;
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}
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String A2 = request.getMethod().toUpperCase() + ":" + uri.toString();
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String HA1 = hashedPassword;
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byte[] mdbytes = messageDigest.digest(A2.getBytes());
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String HA2 = toHexString(mdbytes);
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String cnonce = authHeader.getCNonce();
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String KD = HA1 + ":" + nonce;
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if (cnonce != null) {
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KD += ":" + cnonce;
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}
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KD += ":" + HA2;
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mdbytes = messageDigest.digest(KD.getBytes());
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String mdString = toHexString(mdbytes);
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String response = authHeader.getResponse();
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return mdString.equals(response);
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}
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/**
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* Authenticate the inbound request given plain text password.
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*
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* @param request - the request to authenticate.
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* @param pass -- the plain text password.
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*
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* @return true if authentication succeded and false otherwise.
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*/
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public boolean doAuthenticatePlainTextPassword(Request request, String pass) {
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AuthorizationHeader authHeader = (AuthorizationHeader) request.getHeader(AuthorizationHeader.NAME);
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if ( authHeader == null ) return false;
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String realm = authHeader.getRealm();
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String username = authHeader.getUsername();
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if ( username == null || realm == null ) {
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return false;
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}
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String nonce = authHeader.getNonce();
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URI uri = authHeader.getURI();
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if (uri == null) {
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return false;
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}
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String A1 = username + ":" + realm + ":" + pass;
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String A2 = request.getMethod().toUpperCase() + ":" + uri.toString();
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byte mdbytes[] = messageDigest.digest(A1.getBytes());
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String HA1 = toHexString(mdbytes);
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mdbytes = messageDigest.digest(A2.getBytes());
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String HA2 = toHexString(mdbytes);
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String cnonce = authHeader.getCNonce();
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String KD = HA1 + ":" + nonce;
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if (cnonce != null) {
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KD += ":" + cnonce;
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}
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KD += ":" + HA2;
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mdbytes = messageDigest.digest(KD.getBytes());
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String mdString = toHexString(mdbytes);
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String response = authHeader.getResponse();
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return mdString.equals(response);
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}
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}
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