Revert "HDFS-10757. KMSClientProvider combined with KeyProviderCache can result in wrong UGI being used. Contributed by Xiaoyu Yao."

This reverts commit be72372248.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/crypto/key/kms/KMSClientProvider.java

@@ -373,6 +373,7 @@ public static String checkNotEmpty(String s, String name)
   private ConnectionConfigurator configurator;
   private DelegationTokenAuthenticatedURL.Token authToken;
   private final int authRetry;
+  private final UserGroupInformation actualUgi;
 
   @Override
   public String toString() {
@@ -454,6 +455,15 @@ public KMSClientProvider(URI uri, Configuration conf) throws IOException {
                     KMS_CLIENT_ENC_KEY_CACHE_NUM_REFILL_THREADS_DEFAULT),
             new EncryptedQueueRefiller());
     authToken = new DelegationTokenAuthenticatedURL.Token();
+    UserGroupInformation.AuthenticationMethod authMethod =
+        UserGroupInformation.getCurrentUser().getAuthenticationMethod();
+    if (authMethod == UserGroupInformation.AuthenticationMethod.PROXY) {
+      actualUgi = UserGroupInformation.getCurrentUser().getRealUser();
+    } else if (authMethod == UserGroupInformation.AuthenticationMethod.TOKEN) {
+      actualUgi = UserGroupInformation.getLoginUser();
+    } else {
+      actualUgi =UserGroupInformation.getCurrentUser();
+    }
   }
 
   private static Path extractKMSPath(URI uri) throws MalformedURLException, IOException {
@@ -520,9 +530,19 @@ private HttpURLConnection createConnection(final URL url, String method)
       throws IOException {
     HttpURLConnection conn;
     try {
-      final String doAsUser = getDoAsUser();
+      // if current UGI is different from UGI at constructor time, behave as
-      conn = getActualUgi().doAs(new PrivilegedExceptionAction
+      // proxyuser
-          <HttpURLConnection>() {
+      UserGroupInformation currentUgi = UserGroupInformation.getCurrentUser();
+      final String doAsUser = (currentUgi.getAuthenticationMethod() ==
+          UserGroupInformation.AuthenticationMethod.PROXY)
+                              ? currentUgi.getShortUserName() : null;
+
+      // If current UGI contains kms-dt && is not proxy, doAs it to use its dt.
+      // Otherwise, create the HTTP connection using the UGI at constructor time
+      UserGroupInformation ugiToUse =
+          (currentUgiContainsKmsDt() && doAsUser == null) ?
+              currentUgi : actualUgi;
+      conn = ugiToUse.doAs(new PrivilegedExceptionAction<HttpURLConnection>() {
         @Override
         public HttpURLConnection run() throws Exception {
           DelegationTokenAuthenticatedURL authUrl =
@@ -899,7 +919,7 @@ public long renewDelegationToken(final Token<?> dToken) throws IOException {
           token, url, doAsUser);
       final DelegationTokenAuthenticatedURL authUrl =
           new DelegationTokenAuthenticatedURL(configurator);
-      return getActualUgi().doAs(
+      return actualUgi.doAs(
           new PrivilegedExceptionAction<Long>() {
             @Override
             public Long run() throws Exception {
@@ -922,7 +942,7 @@ public Void cancelDelegationToken(final Token<?> dToken) throws IOException {
       final String doAsUser = getDoAsUser();
       final DelegationTokenAuthenticatedURL.Token token =
           generateDelegationToken(dToken);
-      return getActualUgi().doAs(
+      return actualUgi.doAs(
           new PrivilegedExceptionAction<Void>() {
             @Override
             public Void run() throws Exception {
@@ -994,7 +1014,7 @@ public Token<?>[] addDelegationTokens(final String renewer,
           new DelegationTokenAuthenticatedURL(configurator);
       try {
         final String doAsUser = getDoAsUser();
-        token = getActualUgi().doAs(new PrivilegedExceptionAction<Token<?>>() {
+        token = actualUgi.doAs(new PrivilegedExceptionAction<Token<?>>() {
           @Override
           public Token<?> run() throws Exception {
             // Not using the cached token here.. Creating a new token here
@@ -1040,26 +1060,6 @@ private boolean currentUgiContainsKmsDt() throws IOException {
     return false;
   }
 
-  private UserGroupInformation getActualUgi() throws IOException {
-    final UserGroupInformation currentUgi = UserGroupInformation
-        .getCurrentUser();
-    if (LOG.isDebugEnabled()) {
-      UserGroupInformation.logAllUserInfo(currentUgi);
-    }
-    // Use current user by default
-    UserGroupInformation actualUgi = currentUgi;
-    if (currentUgi.getRealUser() != null) {
-      // Use real user for proxy user
-      actualUgi = currentUgi.getRealUser();
-    } else if (!currentUgiContainsKmsDt() &&
-        !currentUgi.hasKerberosCredentials()) {
-      // Use login user for user that does not have either
-      // Kerberos credential or KMS delegation token for KMS operations
-      actualUgi = currentUgi.getLoginUser();
-    }
-    return actualUgi;
-  }
-
   /**
    * Shutdown valueQueue executor threads
    */

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/security/UserGroupInformation.java

@@ -1823,20 +1823,6 @@ private void logPrivilegedAction(Subject subject, Object action) {
     }
   }
 
-  public static void logAllUserInfo(UserGroupInformation ugi) throws
-      IOException {
-    if (LOG.isDebugEnabled()) {
-      LOG.debug("UGI: " + ugi);
-      if (ugi.getRealUser() != null) {
-        LOG.debug("+RealUGI: " + ugi.getRealUser());
-      }
-      LOG.debug("+LoginUGI: " + ugi.getLoginUser());
-      for (Token<?> token : ugi.getTokens()) {
-        LOG.debug("+UGI token: " + token);
-      }
-    }
-  }
-
   private void print() throws IOException {
     System.out.println("User: " + getUserName());
     System.out.print("Group Ids: ");