/**
* 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();
List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>(20);
params.add(new BasicNameValuePair("username", uname));
params.add(new BasicNameValuePair("realm", realm));
params.add(new BasicNameValuePair("nonce", nonce));
params.add(new BasicNameValuePair("uri", uri));
params.add(new BasicNameValuePair("response", response));
if (qopVariant != QOP_MISSING) {
params.add(new BasicNameValuePair("qop", getQopVariantString()));
params.add(new BasicNameValuePair("nc", NC));
params.add(new BasicNameValuePair("cnonce", getCnonce()));
}
if (algorithm != null) {
params.add(new BasicNameValuePair("algorithm", algorithm));
}
if (opaque != null) {
params.add(new BasicNameValuePair("opaque", opaque));
}
for (int i = 0; i < params.size(); i++) {
BasicNameValuePair param = params.get(i);
if (i > 0) {
buffer.append(", ");
}
boolean noQuotes = "nc".equals(param.getName()) || "qop".equals(param.getName());
BasicHeaderValueFormatter.DEFAULT.formatNameValuePair(buffer, param, !noQuotes);
}
return new BufferedHeader(buffer);
}
/**
* Creates digest-response header as defined in RFC2617.
*
* @param credentials User credentials
* @return The digest-response as String.
*/
private Header createDigestHeader(final Credentials credentials) throws AuthenticationException {
String uri = getParameter("uri");
String realm = getParameter("realm");
String nonce = getParameter("nonce");
String opaque = getParameter("opaque");
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");
}
// TODO: add support for QOP_INT
int qop = QOP_UNKNOWN;
String qoplist = getParameter("qop");
if (qoplist != null) {
StringTokenizer tok = new StringTokenizer(qoplist, ",");
while (tok.hasMoreTokens()) {
String variant = tok.nextToken().trim();
if (variant.equals("auth")) {
qop = QOP_AUTH;
break;
}
}
} else {
qop = QOP_MISSING;
}
if (qop == QOP_UNKNOWN) {
throw new AuthenticationException("None of the qop methods is supported: " + qoplist);
}
// 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";
}
String digAlg = algorithm;
if (digAlg.equalsIgnoreCase("MD5-sess")) {
digAlg = "MD5";
}
MessageDigest digester;
try {
digester = createMessageDigest(digAlg);
} catch (UnsupportedDigestAlgorithmException ex) {
throw new AuthenticationException("Unsuppported digest algorithm: " + digAlg);
}
String uname = credentials.getUserPrincipal().getName();
String pwd = credentials.getPassword();
if (nonce.equals(this.lastNonce)) {
nounceCount++;
} else {
nounceCount = 1;
cnonce = null;
lastNonce = nonce;
}
StringBuilder sb = new StringBuilder(256);
Formatter formatter = new Formatter(sb, Locale.US);
formatter.format("%08x", nounceCount);
String nc = sb.toString();
if (cnonce == null) {
cnonce = createCnonce();
}
a1 = null;
a2 = null;
// 3.2.2.2: Calculating digest
if (algorithm.equalsIgnoreCase("MD5-sess")) {
// H( unq(username-value) ":" unq(realm-value) ":" passwd )
// ":" unq(nonce-value)
// ":" unq(cnonce-value)
// calculated one per session
sb.setLength(0);
sb.append(uname).append(':').append(realm).append(':').append(pwd);
String checksum = encode(digester.digest(EncodingUtils.getBytes(sb.toString(), charset)));
sb.setLength(0);
sb.append(checksum).append(':').append(nonce).append(':').append(cnonce);
a1 = sb.toString();
} else {
// unq(username-value) ":" unq(realm-value) ":" passwd
sb.setLength(0);
sb.append(uname).append(':').append(realm).append(':').append(pwd);
a1 = sb.toString();
}
String hasha1 = encode(digester.digest(EncodingUtils.getBytes(a1, charset)));
if (qop == QOP_AUTH) {
// Method ":" digest-uri-value
a2 = method + ':' + uri;
} else if (qop == QOP_AUTH_INT) {
// Method ":" digest-uri-value ":" H(entity-body)
// TODO: calculate entity hash if entity is repeatable
throw new AuthenticationException("qop-int method is not suppported");
} else {
a2 = method + ':' + uri;
}
String hasha2 = encode(digester.digest(EncodingUtils.getBytes(a2, charset)));
// 3.2.2.1
String digestValue;
if (qop == QOP_MISSING) {
sb.setLength(0);
sb.append(hasha1).append(':').append(nonce).append(':').append(hasha2);
digestValue = sb.toString();
} else {
sb.setLength(0);
sb.append(hasha1)
.append(':')
.append(nonce)
.append(':')
.append(nc)
.append(':')
.append(cnonce)
.append(':')
.append(qop == QOP_AUTH_INT ? "auth-int" : "auth")
.append(':')
.append(hasha2);
digestValue = sb.toString();
}
String digest = encode(digester.digest(EncodingUtils.getAsciiBytes(digestValue)));
CharArrayBuffer buffer = new CharArrayBuffer(128);
if (isProxy()) {
buffer.append(AUTH.PROXY_AUTH_RESP);
} else {
buffer.append(AUTH.WWW_AUTH_RESP);
}
buffer.append(": Digest ");
List<BasicNameValuePair> params = new ArrayList<BasicNameValuePair>(20);
params.add(new BasicNameValuePair("username", uname));
params.add(new BasicNameValuePair("realm", realm));
params.add(new BasicNameValuePair("nonce", nonce));
params.add(new BasicNameValuePair("uri", uri));
params.add(new BasicNameValuePair("response", digest));
if (qop != QOP_MISSING) {
params.add(new BasicNameValuePair("qop", qop == QOP_AUTH_INT ? "auth-int" : "auth"));
params.add(new BasicNameValuePair("nc", nc));
params.add(new BasicNameValuePair("cnonce", cnonce));
}
if (algorithm != null) {
params.add(new BasicNameValuePair("algorithm", algorithm));
}
if (opaque != null) {
params.add(new BasicNameValuePair("opaque", opaque));
}
for (int i = 0; i < params.size(); i++) {
BasicNameValuePair param = params.get(i);
if (i > 0) {
buffer.append(", ");
}
boolean noQuotes = "nc".equals(param.getName()) || "qop".equals(param.getName());
BasicHeaderValueFormatter.DEFAULT.formatNameValuePair(buffer, param, !noQuotes);
}
return new BufferedHeader(buffer);
}