emasab commented on code in PR #19754: URL: https://github.com/apache/kafka/pull/19754#discussion_r2112140286
########## clients/src/main/java/org/apache/kafka/common/security/oauthbearer/internals/secured/assertion/AssertionUtils.java: ########## @@ -0,0 +1,150 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.kafka.common.security.oauthbearer.internals.secured.assertion; + +import org.apache.kafka.common.security.oauthbearer.internals.secured.ConfigurationUtils; +import org.apache.kafka.common.utils.Time; + +import java.io.File; +import java.io.IOException; +import java.nio.charset.StandardCharsets; +import java.security.GeneralSecurityException; +import java.security.KeyFactory; +import java.security.NoSuchAlgorithmException; +import java.security.PrivateKey; +import java.security.Signature; +import java.security.spec.PKCS8EncodedKeySpec; +import java.util.ArrayList; +import java.util.Base64; +import java.util.HashMap; +import java.util.List; +import java.util.Map; +import java.util.Optional; + +import javax.crypto.Cipher; +import javax.crypto.EncryptedPrivateKeyInfo; +import javax.crypto.SecretKey; +import javax.crypto.SecretKeyFactory; +import javax.crypto.spec.PBEKeySpec; + +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_ALGORITHM; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_AUD; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_EXP_SECONDS; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_ISS; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_JTI_INCLUDE; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_NBF_SECONDS; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_CLAIM_SUB; +import static org.apache.kafka.common.config.SaslConfigs.SASL_OAUTHBEARER_ASSERTION_TEMPLATE_FILE; + +/** + * Set of utilities for the OAuth JWT assertion logic. + */ +public class AssertionUtils { + + public static final String TOKEN_SIGNING_ALGORITHM_RS256 = "RS256"; + public static final String TOKEN_SIGNING_ALGORITHM_ES256 = "ES256"; + + /** + * Inspired by {@code org.apache.kafka.common.security.ssl.DefaultSslEngineFactory.PemStore}, which is not + * visible to reuse directly. + */ + public static PrivateKey privateKey(byte[] privateKeyContents, + Optional<String> passphrase) throws GeneralSecurityException, IOException { + PKCS8EncodedKeySpec keySpec; + + if (passphrase.isPresent()) { + EncryptedPrivateKeyInfo keyInfo = new EncryptedPrivateKeyInfo(privateKeyContents); + String algorithm = keyInfo.getAlgName(); + SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance(algorithm); + SecretKey pbeKey = secretKeyFactory.generateSecret(new PBEKeySpec(passphrase.get().toCharArray())); + Cipher cipher = Cipher.getInstance(algorithm); + cipher.init(Cipher.DECRYPT_MODE, pbeKey, keyInfo.getAlgParameters()); + keySpec = keyInfo.getKeySpec(cipher); + } else { + byte[] pkcs8EncodedBytes = Base64.getDecoder().decode(privateKeyContents); + keySpec = new PKCS8EncodedKeySpec(pkcs8EncodedBytes); + } + + KeyFactory keyFactory = KeyFactory.getInstance("RSA"); + return keyFactory.generatePrivate(keySpec); + } + + public static Signature getSignature(String algorithm) throws GeneralSecurityException { + if (algorithm.equalsIgnoreCase(TOKEN_SIGNING_ALGORITHM_RS256)) { + return Signature.getInstance("SHA256withRSA"); + } else if (algorithm.equalsIgnoreCase(TOKEN_SIGNING_ALGORITHM_ES256)) { + return Signature.getInstance("SHA256withECDSA"); + } else { + throw new NoSuchAlgorithmException(String.format("Unsupported signing algorithm: %s", algorithm)); Review Comment: To be future compliant, could we support all JOSE hash lengths for `RS` and `ES`: RS256, RS384, RS512, ES256, ES384, ES512. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: jira-unsubscr...@kafka.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
