/*
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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 gov.nist.core.InternalErrorHandler;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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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 java.security.MessageDigest;
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import java.security.NoSuchAlgorithmException;
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import java.time.Instant;
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import java.util.Random;
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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 Logger logger = LoggerFactory.getLogger(DigestServerAuthenticationHelper.class);
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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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long time = Instant.now().toEpochMilli();
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Random rand = new Random();
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long pad = rand.nextLong();
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String nonceString = Long.valueOf(time).toString()
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+ Long.valueOf(pad).toString();
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byte mdbytes[] = messageDigest.digest(nonceString.getBytes());
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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("qop", "auth");
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proxyAuthenticate.setParameter("nonce", generateNonce());
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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 ) {
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return false;
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}
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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 || authHeader.getRealm() == null) {
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return false;
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}
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String realm = authHeader.getRealm().trim();
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String username = authHeader.getUsername().trim();
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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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// qop 保护质量 包含auth（默认的）和auth-int（增加了报文完整性检测）两种策略
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String qop = authHeader.getQop();
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// 客户端随机数，这是一个不透明的字符串值，由客户端提供，并且客户端和服务器都会使用，以避免用明文文本。
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// 这使得双方都可以查验对方的身份，并对消息的完整性提供一些保护
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String cnonce = authHeader.getCNonce();
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// nonce计数器，是一个16进制的数值，表示同一nonce下客户端发送出请求的数量
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int nc = authHeader.getNonceCount();
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String ncStr = String.format("%08x", nc).toUpperCase();
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// String ncStr = new DecimalFormat("00000000").format(nc);
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// String ncStr = new DecimalFormat("00000000").format(Integer.parseInt(nc + "", 16));
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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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logger.debug("A1: " + A1);
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logger.debug("A2: " + A2);
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mdbytes = messageDigest.digest(A2.getBytes());
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String HA2 = toHexString(mdbytes);
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logger.debug("HA1: " + HA1);
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logger.debug("HA2: " + HA2);
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// String cnonce = authHeader.getCNonce();
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logger.debug("nonce: " + nonce);
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logger.debug("nc: " + ncStr);
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logger.debug("cnonce: " + cnonce);
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logger.debug("qop: " + qop);
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String KD = HA1 + ":" + nonce;
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if (qop != null && qop.equalsIgnoreCase("auth") ) {
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if (nc != -1) {
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KD += ":" + ncStr;
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}
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if (cnonce != null) {
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KD += ":" + cnonce;
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}
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KD += ":" + qop;
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}
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KD += ":" + HA2;
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logger.debug("KD: " + KD);
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mdbytes = messageDigest.digest(KD.getBytes());
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String mdString = toHexString(mdbytes);
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logger.debug("mdString: " + mdString);
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String response = authHeader.getResponse();
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logger.debug("response: " + response);
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return mdString.equals(response);
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}
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}
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