sourabh912 commented on a change in pull request #3006:
URL: https://github.com/apache/hive/pull/3006#discussion_r822168236



##########
File path: service/src/java/org/apache/hive/service/auth/jwt/JWTValidator.java
##########
@@ -0,0 +1,94 @@
+/*
+ * 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.hive.service.auth.jwt;
+
+import com.nimbusds.jose.JOSEException;
+import com.nimbusds.jose.JWSHeader;
+import com.nimbusds.jose.JWSObject;
+import com.nimbusds.jose.JWSVerifier;
+import com.nimbusds.jose.crypto.factories.DefaultJWSVerifierFactory;
+import com.nimbusds.jose.jwk.AsymmetricJWK;
+import com.nimbusds.jose.jwk.JWK;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.SignedJWT;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.sasl.AuthenticationException;
+import java.io.IOException;
+import java.security.Key;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.List;
+
+public class JWTValidator {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(JWTValidator.class.getName());
+  private final URLBasedJWKSProvider jwksProvider;
+  private static final DefaultJWSVerifierFactory verifierFactory = new 
DefaultJWSVerifierFactory();
+
+  public JWTValidator(HiveConf conf) throws IOException, ParseException {
+    this.jwksProvider = new URLBasedJWKSProvider(conf);
+  }
+
+  public String validateJWTAndExtractUser(String signedJwt) throws 
ParseException, AuthenticationException {
+    final SignedJWT parsedJwt = SignedJWT.parse(signedJwt);
+    List<JWK> matchedJWKS = jwksProvider.getJWKs(parsedJwt.getHeader());
+
+    // verify signature
+    for (JWK matchedJWK : matchedJWKS) {
+      try {
+        JWSVerifier verifier = getVerifier(parsedJwt.getHeader(), matchedJWK);
+        if (parsedJwt.verify(verifier)) {
+          break;
+        }
+      } catch (JOSEException e) {
+        LOG.info("Failed to verify JWT {} by JWK {} because {}", 
parsedJwt.getHeader(), matchedJWK.getKeyID(),
+            e.getMessage());
+      }
+    }
+    if (parsedJwt.getState() != JWSObject.State.VERIFIED) {
+      throw new AuthenticationException("Failed to verify JWT signature");
+    }
+
+    // verify claims
+    JWTClaimsSet claimsSet = parsedJwt.getJWTClaimsSet();
+    Date expirationTime = claimsSet.getExpirationTime();
+    if (expirationTime != null) {
+      Date now = new Date();
+      if (now.after(expirationTime)) {
+        throw new AuthenticationException("JWT has been expired");
+      }
+    }
+
+    // We assume the subject of claims is the query user
+    return claimsSet.getSubject();
+  }
+
+  private static JWSVerifier getVerifier(JWSHeader header, JWK jwk) throws 
JOSEException {
+    Key key = null;
+    if (jwk instanceof AsymmetricJWK) {
+      key = ((AsymmetricJWK) jwk).toPublicKey();
+    } else {
+      LOG.debug("Symmetric JWK cannot be used: kid={}, alg={}", 
jwk.getKeyID(), jwk.getAlgorithm());
+    }
+    return key != null ? verifierFactory.createJWSVerifier(header, key) : null;

Review comment:
       Instead of returning a null, shall we throw an error here?  Otherwise we 
would get a NPE when is the code:
   `JWSVerifier verifier = getVerifier(parsedJwt.getHeader(), matchedJWK);`

##########
File path: service/src/java/org/apache/hive/service/auth/jwt/JWTValidator.java
##########
@@ -0,0 +1,94 @@
+/*
+ * 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.hive.service.auth.jwt;
+
+import com.nimbusds.jose.JOSEException;
+import com.nimbusds.jose.JWSHeader;
+import com.nimbusds.jose.JWSObject;
+import com.nimbusds.jose.JWSVerifier;
+import com.nimbusds.jose.crypto.factories.DefaultJWSVerifierFactory;
+import com.nimbusds.jose.jwk.AsymmetricJWK;
+import com.nimbusds.jose.jwk.JWK;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.SignedJWT;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.sasl.AuthenticationException;
+import java.io.IOException;
+import java.security.Key;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.List;
+
+public class JWTValidator {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(JWTValidator.class.getName());
+  private final URLBasedJWKSProvider jwksProvider;
+  private static final DefaultJWSVerifierFactory verifierFactory = new 
DefaultJWSVerifierFactory();
+
+  public JWTValidator(HiveConf conf) throws IOException, ParseException {
+    this.jwksProvider = new URLBasedJWKSProvider(conf);
+  }
+
+  public String validateJWTAndExtractUser(String signedJwt) throws 
ParseException, AuthenticationException {
+    final SignedJWT parsedJwt = SignedJWT.parse(signedJwt);
+    List<JWK> matchedJWKS = jwksProvider.getJWKs(parsedJwt.getHeader());
+
+    // verify signature
+    for (JWK matchedJWK : matchedJWKS) {
+      try {
+        JWSVerifier verifier = getVerifier(parsedJwt.getHeader(), matchedJWK);
+        if (parsedJwt.verify(verifier)) {
+          break;
+        }
+      } catch (JOSEException e) {
+        LOG.info("Failed to verify JWT {} by JWK {} because {}", 
parsedJwt.getHeader(), matchedJWK.getKeyID(),
+            e.getMessage());
+      }
+    }
+    if (parsedJwt.getState() != JWSObject.State.VERIFIED) {
+      throw new AuthenticationException("Failed to verify JWT signature");

Review comment:
       Should we capture the last e.getMessage() about and append it to the 
exception here? That would make the error message of `AuthenticationException` 
more descriptive. 

##########
File path: service/src/java/org/apache/hive/service/auth/jwt/JWTValidator.java
##########
@@ -0,0 +1,94 @@
+/*
+ * 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.hive.service.auth.jwt;
+
+import com.nimbusds.jose.JOSEException;
+import com.nimbusds.jose.JWSHeader;
+import com.nimbusds.jose.JWSObject;
+import com.nimbusds.jose.JWSVerifier;
+import com.nimbusds.jose.crypto.factories.DefaultJWSVerifierFactory;
+import com.nimbusds.jose.jwk.AsymmetricJWK;
+import com.nimbusds.jose.jwk.JWK;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.SignedJWT;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.sasl.AuthenticationException;
+import java.io.IOException;
+import java.security.Key;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.List;
+
+public class JWTValidator {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(JWTValidator.class.getName());
+  private final URLBasedJWKSProvider jwksProvider;
+  private static final DefaultJWSVerifierFactory verifierFactory = new 
DefaultJWSVerifierFactory();
+
+  public JWTValidator(HiveConf conf) throws IOException, ParseException {
+    this.jwksProvider = new URLBasedJWKSProvider(conf);
+  }
+
+  public String validateJWTAndExtractUser(String signedJwt) throws 
ParseException, AuthenticationException {
+    final SignedJWT parsedJwt = SignedJWT.parse(signedJwt);
+    List<JWK> matchedJWKS = jwksProvider.getJWKs(parsedJwt.getHeader());
+
+    // verify signature
+    for (JWK matchedJWK : matchedJWKS) {
+      try {
+        JWSVerifier verifier = getVerifier(parsedJwt.getHeader(), matchedJWK);
+        if (parsedJwt.verify(verifier)) {
+          break;
+        }
+      } catch (JOSEException e) {
+        LOG.info("Failed to verify JWT {} by JWK {} because {}", 
parsedJwt.getHeader(), matchedJWK.getKeyID(),
+            e.getMessage());
+      }
+    }
+    if (parsedJwt.getState() != JWSObject.State.VERIFIED) {
+      throw new AuthenticationException("Failed to verify JWT signature");
+    }
+
+    // verify claims
+    JWTClaimsSet claimsSet = parsedJwt.getJWTClaimsSet();
+    Date expirationTime = claimsSet.getExpirationTime();
+    if (expirationTime != null) {
+      Date now = new Date();
+      if (now.after(expirationTime)) {
+        throw new AuthenticationException("JWT has been expired");
+      }
+    }
+
+    // We assume the subject of claims is the query user
+    return claimsSet.getSubject();
+  }
+
+  private static JWSVerifier getVerifier(JWSHeader header, JWK jwk) throws 
JOSEException {
+    Key key = null;
+    if (jwk instanceof AsymmetricJWK) {

Review comment:
       @hsnusonic : Couple of questions: 
   1. Can you explain the rationale behind this check `jwk instanceof 
AsymmetricJWK`? 
   2. Why is this method static? 

##########
File path: service/src/java/org/apache/hive/service/auth/jwt/JWTValidator.java
##########
@@ -0,0 +1,94 @@
+/*
+ * 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.hive.service.auth.jwt;
+
+import com.nimbusds.jose.JOSEException;
+import com.nimbusds.jose.JWSHeader;
+import com.nimbusds.jose.JWSObject;
+import com.nimbusds.jose.JWSVerifier;
+import com.nimbusds.jose.crypto.factories.DefaultJWSVerifierFactory;
+import com.nimbusds.jose.jwk.AsymmetricJWK;
+import com.nimbusds.jose.jwk.JWK;
+import com.nimbusds.jwt.JWTClaimsSet;
+import com.nimbusds.jwt.SignedJWT;
+import org.apache.hadoop.hive.conf.HiveConf;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.security.sasl.AuthenticationException;
+import java.io.IOException;
+import java.security.Key;
+import java.text.ParseException;
+import java.util.Date;
+import java.util.List;
+
+public class JWTValidator {
+
+  private static final Logger LOG = 
LoggerFactory.getLogger(JWTValidator.class.getName());
+  private final URLBasedJWKSProvider jwksProvider;
+  private static final DefaultJWSVerifierFactory verifierFactory = new 
DefaultJWSVerifierFactory();
+
+  public JWTValidator(HiveConf conf) throws IOException, ParseException {
+    this.jwksProvider = new URLBasedJWKSProvider(conf);
+  }
+
+  public String validateJWTAndExtractUser(String signedJwt) throws 
ParseException, AuthenticationException {
+    final SignedJWT parsedJwt = SignedJWT.parse(signedJwt);
+    List<JWK> matchedJWKS = jwksProvider.getJWKs(parsedJwt.getHeader());
+
+    // verify signature
+    for (JWK matchedJWK : matchedJWKS) {
+      try {
+        JWSVerifier verifier = getVerifier(parsedJwt.getHeader(), matchedJWK);
+        if (parsedJwt.verify(verifier)) {
+          break;
+        }
+      } catch (JOSEException e) {
+        LOG.info("Failed to verify JWT {} by JWK {} because {}", 
parsedJwt.getHeader(), matchedJWK.getKeyID(),

Review comment:
       nit: Should the log level be `warn` ? 




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