* Digest authentication scheme as defined in RFC 2617. * Both MD5 (default) and MD5-sess are supported. * Currently only qop=auth or no qop is supported. qop=auth-int * is unsupported. If auth and auth-int are provided, auth is * used. *
** Credential charset is configured via the * {@link org.apache.http.auth.params.AuthPNames#CREDENTIAL_CHARSET * credential charset} parameter. * Since the digest username is included as clear text in the generated * Authentication header, the charset of the username must be compatible * with the * {@link org.apache.http.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET * http element charset}. *
* * @author Remy Maucherat * @author Rodney Waldhoff * @author Jeff Dever * @author Ortwin Glueck * @author Sean C. Sullivan * @author Adrian Sutton * @author Mike Bowler * @author Oleg Kalnichevski * * @since 4.0 * * @deprecated Please use {@link java.net.URL#openConnection} instead. * Please visit this webpage * for further details. */ @Deprecated public class DigestScheme extends RFC2617Scheme { /** * Hexa values used when creating 32 character long digest in HTTP DigestScheme * in case of authentication. * * @see #encode(byte[]) */ private static final char[] HEXADECIMAL = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' }; /** Whether the digest authentication process is complete */ private boolean complete; //TODO: supply a real nonce-count, currently a server will interprete a repeated request as a replay private static final String NC = "00000001"; //nonce-count is always 1 private static final int QOP_MISSING = 0; private static final int QOP_AUTH_INT = 1; private static final int QOP_AUTH = 2; private int qopVariant = QOP_MISSING; private String cnonce; /** * Default constructor for the digest authetication scheme. */ public DigestScheme() { super(); this.complete = false; } /** * Processes the Digest challenge. * * @param header the challenge header * * @throws MalformedChallengeException is thrown if the authentication challenge * is malformed */ @Override public void processChallenge( final Header header) throws MalformedChallengeException { super.processChallenge(header); if (getParameter("realm") == null) { throw new MalformedChallengeException("missing realm in challange"); } if (getParameter("nonce") == null) { throw new MalformedChallengeException("missing nonce in challange"); } boolean unsupportedQop = false; // qop parsing String qop = getParameter("qop"); if (qop != null) { StringTokenizer tok = new StringTokenizer(qop,","); while (tok.hasMoreTokens()) { String variant = tok.nextToken().trim(); if (variant.equals("auth")) { qopVariant = QOP_AUTH; break; //that's our favourite, because auth-int is unsupported } else if (variant.equals("auth-int")) { qopVariant = QOP_AUTH_INT; } else { unsupportedQop = true; } } } if (unsupportedQop && (qopVariant == QOP_MISSING)) { throw new MalformedChallengeException("None of the qop methods is supported"); } // Reset cnonce this.cnonce = null; this.complete = true; } /** * Tests if the Digest authentication process has been completed. * * @return true if Digest authorization has been processed, * false otherwise. */ public boolean isComplete() { String s = getParameter("stale"); if ("true".equalsIgnoreCase(s)) { return false; } else { return this.complete; } } /** * Returns textual designation of the digest authentication scheme. * * @returndigest
*/
public String getSchemeName() {
return "digest";
}
/**
* Returns false. Digest authentication scheme is request based.
*
* @return false.
*/
public boolean isConnectionBased() {
return false;
}
public void overrideParamter(final String name, final String value) {
getParameters().put(name, value);
}
private String getCnonce() {
if (this.cnonce == null) {
this.cnonce = createCnonce();
}
return this.cnonce;
}
/**
* Produces a digest authorization string for the given set of
* {@link Credentials}, method name and URI.
*
* @param credentials A set of credentials to be used for athentication
* @param request The request being authenticated
*
* @throws org.apache.http.auth.InvalidCredentialsException if authentication credentials
* are not valid or not applicable for this authentication scheme
* @throws AuthenticationException if authorization string cannot
* be generated due to an authentication failure
*
* @return a digest authorization string
*/
public Header authenticate(
final Credentials credentials,
final HttpRequest request) throws AuthenticationException {
if (credentials == null) {
throw new IllegalArgumentException("Credentials may not be null");
}
if (request == null) {
throw new IllegalArgumentException("HTTP request may not be null");
}
// Add method name and request-URI to the parameter map
getParameters().put("methodname", request.getRequestLine().getMethod());
getParameters().put("uri", request.getRequestLine().getUri());
String charset = getParameter("charset");
if (charset == null) {
charset = AuthParams.getCredentialCharset(request.getParams());
getParameters().put("charset", charset);
}
String digest = createDigest(credentials);
return createDigestHeader(credentials, digest);
}
private static MessageDigest createMessageDigest(
final String digAlg) throws UnsupportedDigestAlgorithmException {
try {
return MessageDigest.getInstance(digAlg);
} catch (Exception e) {
throw new UnsupportedDigestAlgorithmException(
"Unsupported algorithm in HTTP Digest authentication: "
+ digAlg);
}
}
/**
* Creates an MD5 response digest.
*
* @return The created digest as string. This will be the response tag's
* value in the Authentication HTTP header.
* @throws AuthenticationException when MD5 is an unsupported algorithm
*/
private String createDigest(final Credentials credentials) throws AuthenticationException {
// Collecting required tokens
String uri = getParameter("uri");
String realm = getParameter("realm");
String nonce = getParameter("nonce");
String method = getParameter("methodname");
String algorithm = getParameter("algorithm");
if (uri == null) {
throw new IllegalStateException("URI may not be null");
}
if (realm == null) {
throw new IllegalStateException("Realm may not be null");
}
if (nonce == null) {
throw new IllegalStateException("Nonce may not be null");
}
// If an algorithm is not specified, default to MD5.
if (algorithm == null) {
algorithm = "MD5";
}
// If an charset is not specified, default to ISO-8859-1.
String charset = getParameter("charset");
if (charset == null) {
charset = "ISO-8859-1";
}
if (qopVariant == QOP_AUTH_INT) {
throw new AuthenticationException(
"Unsupported qop in HTTP Digest authentication");
}
MessageDigest md5Helper = createMessageDigest("MD5");
String uname = credentials.getUserPrincipal().getName();
String pwd = credentials.getPassword();
// 3.2.2.2: Calculating digest
StringBuilder tmp = new StringBuilder(uname.length() + realm.length() + pwd.length() + 2);
tmp.append(uname);
tmp.append(':');
tmp.append(realm);
tmp.append(':');
tmp.append(pwd);
// unq(username-value) ":" unq(realm-value) ":" passwd
String a1 = tmp.toString();
//a1 is suitable for MD5 algorithm
if(algorithm.equalsIgnoreCase("MD5-sess")) { // android-changed: ignore case
// H( unq(username-value) ":" unq(realm-value) ":" passwd )
// ":" unq(nonce-value)
// ":" unq(cnonce-value)
String cnonce = getCnonce();
String tmp2=encode(md5Helper.digest(EncodingUtils.getBytes(a1, charset)));
StringBuilder tmp3 = new StringBuilder(tmp2.length() + nonce.length() + cnonce.length() + 2);
tmp3.append(tmp2);
tmp3.append(':');
tmp3.append(nonce);
tmp3.append(':');
tmp3.append(cnonce);
a1 = tmp3.toString();
} else if (!algorithm.equalsIgnoreCase("MD5")) { // android-changed: ignore case
throw new AuthenticationException("Unhandled algorithm " + algorithm + " requested");
}
String md5a1 = encode(md5Helper.digest(EncodingUtils.getBytes(a1, charset)));
String a2 = null;
if (qopVariant == QOP_AUTH_INT) {
// Unhandled qop auth-int
//we do not have access to the entity-body or its hash
//TODO: add Method ":" digest-uri-value ":" H(entity-body)
} else {
a2 = method + ':' + uri;
}
String md5a2 = encode(md5Helper.digest(EncodingUtils.getAsciiBytes(a2)));
// 3.2.2.1
String serverDigestValue;
if (qopVariant == QOP_MISSING) {
StringBuilder tmp2 = new StringBuilder(md5a1.length() + nonce.length() + md5a2.length());
tmp2.append(md5a1);
tmp2.append(':');
tmp2.append(nonce);
tmp2.append(':');
tmp2.append(md5a2);
serverDigestValue = tmp2.toString();
} else {
String qopOption = getQopVariantString();
String cnonce = getCnonce();
StringBuilder tmp2 = new StringBuilder(md5a1.length() + nonce.length()
+ NC.length() + cnonce.length() + qopOption.length() + md5a2.length() + 5);
tmp2.append(md5a1);
tmp2.append(':');
tmp2.append(nonce);
tmp2.append(':');
tmp2.append(NC);
tmp2.append(':');
tmp2.append(cnonce);
tmp2.append(':');
tmp2.append(qopOption);
tmp2.append(':');
tmp2.append(md5a2);
serverDigestValue = tmp2.toString();
}
String serverDigest =
encode(md5Helper.digest(EncodingUtils.getAsciiBytes(serverDigestValue)));
return serverDigest;
}
/**
* Creates digest-response header as defined in RFC2617.
*
* @param credentials User credentials
* @param digest The response tag's value as String.
*
* @return The digest-response as String.
*/
private Header createDigestHeader(
final Credentials credentials,
final String digest) throws AuthenticationException {
CharArrayBuffer buffer = new CharArrayBuffer(128);
if (isProxy()) {
buffer.append(AUTH.PROXY_AUTH_RESP);
} else {
buffer.append(AUTH.WWW_AUTH_RESP);
}
buffer.append(": Digest ");
String uri = getParameter("uri");
String realm = getParameter("realm");
String nonce = getParameter("nonce");
String opaque = getParameter("opaque");
String response = digest;
String algorithm = getParameter("algorithm");
String uname = credentials.getUserPrincipal().getName();
ListString according to RFC 2617.
*
* @param binaryData array containing the digest
* @return encoded MD5, or null if encoding failed
*/
private static String encode(byte[] binaryData) {
if (binaryData.length != 16) {
return null;
}
char[] buffer = new char[32];
for (int i = 0; i < 16; i++) {
int low = (binaryData[i] & 0x0f);
int high = ((binaryData[i] & 0xf0) >> 4);
buffer[i * 2] = HEXADECIMAL[high];
buffer[(i * 2) + 1] = HEXADECIMAL[low];
}
return new String(buffer);
}
/**
* Creates a random cnonce value based on the current time.
*
* @return The cnonce value as String.
* @throws UnsupportedDigestAlgorithmException if MD5 algorithm is not supported.
*/
public static String createCnonce() {
String cnonce;
MessageDigest md5Helper = createMessageDigest("MD5");
cnonce = Long.toString(System.currentTimeMillis());
cnonce = encode(md5Helper.digest(EncodingUtils.getAsciiBytes(cnonce)));
return cnonce;
}
}