Fix HTTP response processing for WWW-Authenticate headers

The original code was able to process only one WWW-Authenticate
header in an HTTP response, and if this header was not one of
two expected, authentication failed regardless of that there
could be other headers in the response.

All WWW-Authenticate headers in an HTTP response have to be
browsed to find one of supported, i.e. Basic or Digest.
By that if both are present, the Digest one should be used
as more preferable.

Bug: 357719
Change-Id: Icf601a41fec63f7d40308f3c85aaa4f71a7c095b
Signed-off-by: Alex Rukhlin <arukhlin@microsoft.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit.test/tst/org/eclipse/jgit/transport/HttpAuthTest.java

@@ -0,0 +1,162 @@
+/*
+ * Copyright (C) 2013, Microsoft Corporation
+ *
+ * This program and the accompanying materials are made available
+ * under the terms of the Eclipse Distribution License v1.0 which
+ * accompanies this distribution, is reproduced below, and is
+ * available at http://www.eclipse.org/org/documents/edl-v10.php
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ *   copyright notice, this list of conditions and the following
+ *   disclaimer in the documentation and/or other materials provided
+ *   with the distribution.
+ *
+ * - Neither the name of the Eclipse Foundation, Inc. nor the
+ *   names of its contributors may be used to endorse or promote
+ *   products derived from this software without specific prior
+ *   written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
+ * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
+ * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+package org.eclipse.jgit.transport;
+
+import static org.junit.Assert.fail;
+
+import java.io.IOException;
+import java.net.HttpURLConnection;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.Test;
+
+public class HttpAuthTest {
+	private static String digestHeader = "WWW-Authenticate: Digest qop=\"auth\",algorithm=MD5-sess,nonce=\"+Upgraded+v1b9...ba\",charset=utf-8,realm=\"Digest\"";
+
+	private static String basicHeader = "WWW-Authenticate: Basic realm=\"everyones.loves.git\"";
+
+	private static String ntlmHeader = "WWW-Authenticate: NTLM";
+
+	private static String bearerHeader = "WWW-Authenticate: Bearer";
+
+	private static String URL_SAMPLE = "http://everyones.loves.git/u/2";
+
+	private static String BASIC = "Basic";
+
+	private static String DIGEST = "Digest";
+
+	@Test
+	public void testHttpAuthScanResponse() throws MalformedURLException {
+		checkResponse(new String[] { basicHeader }, BASIC);
+		checkResponse(new String[] { digestHeader }, DIGEST);
+		checkResponse(new String[] { basicHeader, digestHeader }, DIGEST);
+		checkResponse(new String[] { digestHeader, basicHeader }, DIGEST);
+		checkResponse(new String[] { ntlmHeader, basicHeader, digestHeader,
+				bearerHeader }, DIGEST);
+		checkResponse(new String[] { ntlmHeader, basicHeader, bearerHeader },
+				BASIC);
+	}
+
+	private static void checkResponse(String[] headers,
+			String expectedAuthMethod) throws MalformedURLException {
+
+		AuthHeadersResponse responce = new AuthHeadersResponse(headers);
+		HttpAuthMethod authMethod = HttpAuthMethod.scanResponse(responce);
+
+		if (!expectedAuthMethod.equals(getAuthMethodName(authMethod))) {
+			fail("Wrong authentication method: expected " + expectedAuthMethod
+					+ ", but received " + getAuthMethodName(authMethod));
+		}
+	}
+
+	private static String getAuthMethodName(HttpAuthMethod authMethod) {
+		return authMethod.getClass().getSimpleName();
+	}
+
+	private static class AuthHeadersResponse extends HttpURLConnection {
+		Map<String, List<String>> headerFields = new HashMap<String, List<String>>();
+
+		public AuthHeadersResponse(String[] authHeaders)
+				throws MalformedURLException {
+			super(new URL(URL_SAMPLE));
+			parseHeaders(authHeaders);
+		}
+
+		@Override
+		public void disconnect() {
+			fail("The disconnect method shouldn't be invoked");
+		}
+
+		@Override
+		public boolean usingProxy() {
+			return false;
+		}
+
+		@Override
+		public void connect() throws IOException {
+			fail("The connect method shouldn't be invoked");
+		}
+
+		@Override
+		public String getHeaderField(String name) {
+			if (!headerFields.containsKey(name))
+				return null;
+			else {
+				int n = headerFields.get(name).size();
+
+				if (n > 0)
+					return headerFields.get(name).get(n - 1);
+				else
+					return null;
+			}
+		}
+
+		@Override
+		public Map<String, List<String>> getHeaderFields() {
+			return headerFields;
+		}
+
+		private void parseHeaders(String[] headers) {
+			for (String header : headers) {
+				int i = header.indexOf(':');
+
+				if (i < 0)
+					continue;
+
+				String key = header.substring(0, i);
+				String value = header.substring(i + 1).trim();
+
+				if (!headerFields.containsKey(key))
+					headerFields.put(key, new ArrayList<String>());
+
+				List<String> values = headerFields.get(key);
+				values.add(value);
+			}
+		}
+	}
+}

org.eclipse.jgit/src/org/eclipse/jgit/transport/HttpAuthMethod.java

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010, Google Inc.
+ * Copyright (C) 2010, 2013, Google Inc.
  * and other copyright owners as documented in the project's IP log.
  *
  * This program and the accompanying materials are made available
@@ -55,7 +55,9 @@ import java.security.NoSuchAlgorithmException;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Random;
 
 import org.eclipse.jgit.util.Base64;
@@ -69,6 +71,8 @@ import org.eclipse.jgit.util.Base64;
 abstract class HttpAuthMethod {
 	/** No authentication is configured. */
 	static final HttpAuthMethod NONE = new None();
+	static final String EMPTY_STRING = ""; //$NON-NLS-1$
+	static final String SCHEMA_NAME_SEPARATOR = " "; //$NON-NLS-1$
 
 	/**
 	 * Handle an authentication failure and possibly return a new response.
@@ -77,22 +81,39 @@ abstract class HttpAuthMethod {
 	 *            the connection that failed.
 	 * @return new authentication method to try.
 	 */
-	static HttpAuthMethod scanResponse(HttpURLConnection conn) {
-		String hdr = conn.getHeaderField(HDR_WWW_AUTHENTICATE);
-		if (hdr == null || hdr.length() == 0)
-			return NONE;
-
-		int sp = hdr.indexOf(' ');
-		if (sp < 0)
-			return NONE;
-
-		String type = hdr.substring(0, sp);
-		if (Basic.NAME.equalsIgnoreCase(type))
-			return new Basic();
-		else if (Digest.NAME.equalsIgnoreCase(type))
-			return new Digest(hdr.substring(sp + 1));
-		else
-			return NONE;
+	static HttpAuthMethod scanResponse(final HttpURLConnection conn) {
+		final Map<String, List<String>> headers = conn.getHeaderFields();
+		HttpAuthMethod authentication = NONE;
+
+		for (final Entry<String, List<String>> entry : headers.entrySet()) {
+			if (HDR_WWW_AUTHENTICATE.equalsIgnoreCase(entry.getKey())) {
+				if (entry.getValue() != null) {
+					for (final String value : entry.getValue()) {
+						if (value != null && value.length() != 0) {
+							final String[] valuePart = value.split(
+									SCHEMA_NAME_SEPARATOR, 2);
+
+							if (Digest.NAME.equalsIgnoreCase(valuePart[0])) {
+								final String param;
+								if (valuePart.length == 1)
+									param = EMPTY_STRING;
+								else
+									param = valuePart[1];
+
+								authentication = new Digest(param);
+								break;
+							}
+
+							if (Basic.NAME.equalsIgnoreCase(valuePart[0]))
+								authentication = new Basic();
+						}
+					}
+				}
+				break;
+			}
+		}
+
+		return authentication;
 	}
 
 	/**