Merge "Extract insecure Cipher factory"

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

+/*
+ * Copyright (C) 2016, Google Inc.
+ * and other copyright owners as documented in the project's IP log.
+ *
+ * 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 java.security.NoSuchAlgorithmException;
+
+import javax.crypto.Cipher;
+import javax.crypto.NoSuchPaddingException;
+
+/**
+ * <b>DO NOT USE</b> Factory to create any cipher.
+ * <p>
+ * This is a hack for {@link WalkEncryption} to create any cipher configured by
+ * the end-user. Using this class allows JGit to violate ErrorProne's security
+ * recommendations (<a
+ * href="http://errorprone.info/bugpattern/InsecureCryptoUsage"
+ * >InsecureCryptoUsage</a>), which is not secure.
+ */
+class InsecureCipherFactory {
+	static Cipher create(String algo)
+			throws NoSuchAlgorithmException, NoSuchPaddingException {
+		return Cipher.getInstance(algo);
+	}
+}

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

 			cryptoAlg = algo;
 
 			// Verify if cipher is present.
-			Cipher cipher = Cipher.getInstance(cryptoAlg);
+			Cipher cipher = InsecureCipherFactory.create(cryptoAlg);
 
 			// Standard names are not case-sensitive.
 			// http://docs.oracle.com/javase/8/docs/technotes/guides/security/StandardNames.html
 		@Override
 		OutputStream encrypt(final OutputStream os) throws IOException {
 			try {
-				final Cipher cipher = Cipher.getInstance(cryptoAlg);
+				final Cipher cipher = InsecureCipherFactory.create(cryptoAlg);
 				cipher.init(Cipher.ENCRYPT_MODE, secretKey, paramSpec);
 				return new CipherOutputStream(os, cipher);
 			} catch (GeneralSecurityException e) {
 		@Override
 		InputStream decrypt(final InputStream in) throws IOException {
 			try {
-				final Cipher cipher = Cipher.getInstance(cryptoAlg);
+				final Cipher cipher = InsecureCipherFactory.create(cryptoAlg);
 				cipher.init(Cipher.DECRYPT_MODE, secretKey, paramSpec);
 				return new CipherInputStream(in, cipher);
 			} catch (GeneralSecurityException e) {
 			String keySalt = props.getProperty(profile + X_KEY_SALT, DEFAULT_KEY_SALT);
 
 			// Verify if cipher is present.
-			Cipher cipher = Cipher.getInstance(cipherAlgo);
+			Cipher cipher = InsecureCipherFactory.create(cipherAlgo);
 
 			// Verify if key factory is present.
 			SecretKeyFactory factory = SecretKeyFactory.getInstance(keyAlgo);
 		@Override
 		OutputStream encrypt(OutputStream output) throws IOException {
 			try {
-				Cipher cipher = Cipher.getInstance(cipherAlgo);
+				Cipher cipher = InsecureCipherFactory.create(cipherAlgo);
 				cipher.init(Cipher.ENCRYPT_MODE, secretKey);
 				AlgorithmParameters params = cipher.getParameters();
 				if (params == null) {
 						JGitText.get().unsupportedEncryptionVersion, vers));
 			}
 			try {
-				decryptCipher = Cipher.getInstance(cipherAlgo);
+				decryptCipher = InsecureCipherFactory.create(cipherAlgo);
 				if (cont.isEmpty()) {
 					decryptCipher.init(Cipher.DECRYPT_MODE, secretKey);
 				} else {