[GitHub] [hadoop] bharatviswa504 commented on a change in pull request #561: HDDS-1043. Enable token based authentication for S3 api.

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bharatviswa504 commented on a change in pull request #561: HDDS-1043. Enable token based authentication for S3 api.
URL: https://github.com/apache/hadoop/pull/561#discussion_r263083685
 
 

 ##########
 File path: hadoop-ozone/common/src/main/java/org/apache/hadoop/ozone/security/AWSV4AuthValidator.java
 ##########
 @@ -0,0 +1,98 @@
+/*
+ * 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.hadoop.ozone.security;
+
+import org.apache.hadoop.util.StringUtils;
+import org.apache.kerby.util.Hex;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.crypto.Mac;
+import javax.crypto.spec.SecretKeySpec;
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.security.GeneralSecurityException;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * AWS v4 authentication payload validator. For more details refer to AWS
+ * documentation https://docs.aws.amazon.com/general/latest/gr/
+ * sigv4-create-canonical-request.html.
+ **/
+final class AWSV4AuthValidator {
+
+  private final static Logger LOG =
+      LoggerFactory.getLogger(AWSV4AuthValidator.class);
+  private static final String HMAC_SHA256_ALGORITHM = "HmacSHA256";
+  private static final Charset UTF_8 = Charset.forName("utf-8");
+
+  private AWSV4AuthValidator() {
+  }
+
+  private static String urlDecode(String str) {
+    try {
+      return URLDecoder.decode(str, UTF_8.name());
+    } catch (UnsupportedEncodingException e) {
+      throw new RuntimeException(e);
+    }
+  }
+
+  public static String hash(String payload) throws NoSuchAlgorithmException {
+    MessageDigest md = MessageDigest.getInstance("SHA-256");
+    md.update(payload.getBytes(UTF_8));
+    return String.format("%064x", new java.math.BigInteger(1, md.digest()));
+  }
+
+  private static byte[] sign(byte[] key, String msg) {
+    try {
+      SecretKeySpec signingKey = new SecretKeySpec(key, HMAC_SHA256_ALGORITHM);
+      Mac mac = Mac.getInstance(HMAC_SHA256_ALGORITHM);
+      mac.init(signingKey);
+      return mac.doFinal(msg.getBytes(StandardCharsets.UTF_8));
+    } catch (GeneralSecurityException gse) {
+      throw new RuntimeException(gse);
+    }
+  }
+
+  private static byte[] getSignatureKey(String key, String strToSign) {
+    String[] signData = StringUtils.split(StringUtils.split(strToSign,
+        '\n')[2], '/');
+    String dateStamp = signData[0];
+    String regionName = signData[1];
+    String serviceName = signData[2];
+    byte[] kDate = sign(("AWS4" + key).getBytes(UTF_8), dateStamp);
+    byte[] kRegion = sign(kDate, regionName);
+    byte[] kService = sign(kRegion, serviceName);
+    byte[] kSigning = sign(kService, "aws4_request");
+    LOG.info(Hex.encode(kSigning));
+    return kSigning;
+  }
+
+  /**
+   * Validate request. Returns true if aws request is legit else returns false.
+   */
+  public static boolean validateRequest(String strToSign, String signature,
+      String userKey) {
+    String expectedSignature = Hex.encode(sign(getSignatureKey(
+        userKey, strToSign), strToSign));
+    return expectedSignature.equals(signature);
+  }
 
 Review comment:
   Can we add javadoc for the methods.
   It is very difficult to look in to this code, as when reviewing we need to have this link
   https://docs.aws.amazon.com/AmazonS3/latest/API/sig-v4-authenticating-requests.html and review.
   
   We can take the snippet from the doc, add it in comments or javadoc. It will be very helpful during reading code later.

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