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package com.sun.mail.smtp;
import java.io.*;
import java.util.*;
import java.security.*;
import com.sun.mail.util.*;
/**
* DIGEST-MD5 authentication support.
*
* @author Dean Gibson
* @author Bill Shannon
*/
public class DigestMD5 {
private PrintStream debugout; // if not null, debug output stream
private MessageDigest md5;
private String uri;
private String clientResponse;
public DigestMD5(PrintStream debugout) {
this.debugout = debugout;
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: Loaded");
}
/**
* Return client's authentication response to server's challenge.
*
* @return byte array with client's response
*/
public byte[] authClient(String host, String user, String passwd,
String realm, String serverChallenge)
throws IOException {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
OutputStream b64os = new BASE64EncoderStream(bos, Integer.MAX_VALUE);
SecureRandom random;
try {
//random = SecureRandom.getInstance("SHA1PRNG");
random = new SecureRandom();
md5 = MessageDigest.getInstance("MD5");
} catch (NoSuchAlgorithmException ex) {
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: " + ex);
throw new IOException(ex.toString());
}
StringBuffer result = new StringBuffer();
uri = "smtp/" + host;
String nc = "00000001";
String qop = "auth";
byte[] bytes = new byte[32]; // arbitrary size ...
int resp;
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: Begin authentication ...");
// Code based on http://www.ietf.org/rfc/rfc2831.txt
Hashtable map = tokenize(serverChallenge);
if (realm == null) {
String text = (String)map.get("realm");
realm = text != null ? new StringTokenizer(text, ",").nextToken()
: host;
}
// server challenge random value
String nonce = (String)map.get("nonce");
random.nextBytes(bytes);
b64os.write(bytes);
b64os.flush();
// client challenge random value
String cnonce = bos.toString();
bos.reset();
// DIGEST-MD5 computation, common portion (order critical)
md5.update(md5.digest(
ASCIIUtility.getBytes(user + ":" + realm + ":" + passwd)));
md5.update(ASCIIUtility.getBytes(":" + nonce + ":" + cnonce));
clientResponse = toHex(md5.digest())
+ ":" + nonce + ":" + nc + ":" + cnonce + ":" + qop + ":";
// DIGEST-MD5 computation, client response (order critical)
md5.update(ASCIIUtility.getBytes("AUTHENTICATE:" + uri));
md5.update(ASCIIUtility.getBytes(clientResponse + toHex(md5.digest())));
// build response text (order not critical)
result.append("username=\"" + user + "\"");
result.append(",realm=\"" + realm + "\"");
result.append(",qop=" + qop);
result.append(",nc=" + nc);
result.append(",nonce=\"" + nonce + "\"");
result.append(",cnonce=\"" + cnonce + "\"");
result.append(",digest-uri=\"" + uri + "\"");
result.append(",response=" + toHex(md5.digest()));
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: Response => "
+ result.toString());
b64os.write(ASCIIUtility.getBytes(result.toString()));
b64os.flush();
return bos.toByteArray();
}
/**
* Allow the client to authenticate the server based on its
* response.
*
* @return true if server is authenticated
*/
public boolean authServer(String serverResponse) throws IOException {
Hashtable map = tokenize(serverResponse);
// DIGEST-MD5 computation, server response (order critical)
md5.update(ASCIIUtility.getBytes(":" + uri));
md5.update(ASCIIUtility.getBytes(clientResponse + toHex(md5.digest())));
String text = toHex(md5.digest());
if (!text.equals((String)map.get("rspauth"))) {
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: " +
"Expected => rspauth=" + text);
return false; // server NOT authenticated by client !!!
}
return true;
}
/**
* Tokenize a response from the server.
*
* @return Hashtable containing key/value pairs from server
*/
private Hashtable tokenize(String serverResponse) throws IOException {
Hashtable map = new Hashtable();
byte[] bytes = serverResponse.getBytes();
String key = null;
int ttype;
StreamTokenizer tokens
= new StreamTokenizer(
new InputStreamReader(
new BASE64DecoderStream(
new ByteArrayInputStream(bytes, 4, bytes.length - 4)
)));
tokens.ordinaryChars('0', '9'); // reset digits
tokens.wordChars('0', '9'); // digits may start words
while ((ttype = tokens.nextToken()) != StreamTokenizer.TT_EOF) {
switch (ttype) {
case StreamTokenizer.TT_WORD:
if (key == null) {
key = tokens.sval;
break;
}
// fall-thru
case '"':
if (debugout != null)
debugout.println("DEBUG DIGEST-MD5: Received => "
+ key + "='" + tokens.sval + "'");
if (map.containsKey(key)) { // concatenate multiple values
map.put(key, map.get(key) + "," + tokens.sval);
} else {
map.put(key, tokens.sval);
}
key = null;
break;
}
}
return map;
}
private static char[] digits = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
};
/**
* Convert a byte array to a string of hex digits representing the bytes.
*/
private static String toHex(byte[] bytes) {
char[] result = new char[bytes.length * 2];
for (int index = 0, i = 0; index < bytes.length; index++) {
int temp = bytes[index] & 0xFF;
result[i++] = digits[temp >> 4];
result[i++] = digits[temp & 0xF];
}
return new String(result);
}
}
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