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taklwu pushed a commit to branch branch-2.6
in repository https://gitbox.apache.org/repos/asf/hbase.git


The following commit(s) were added to refs/heads/branch-2.6 by this push:
     new cf8c75ff3d4 HBASE-30257 Fix case-sensitive hostname check in region 
server (#8413) (#8431)
cf8c75ff3d4 is described below

commit cf8c75ff3d4ed63188615c5d1bc744ac2dd37623
Author: Tak Lon (Stephen) Wu <[email protected]>
AuthorDate: Mon Jul 6 20:46:17 2026 -0700

    HBASE-30257 Fix case-sensitive hostname check in region server (#8413) 
(#8431)
---
 .../hbase/io/crypto/tls/HBaseHostnameVerifier.java | 50 +++++-----------------
 .../java/org/apache/hadoop/hbase/util/Strings.java | 48 +++++++++++++++++++++
 .../org/apache/hadoop/hbase/util/TestStrings.java  | 48 +++++++++++++++++++++
 .../hadoop/hbase/regionserver/HRegionServer.java   |  6 ++-
 4 files changed, 110 insertions(+), 42 deletions(-)

diff --git 
a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/HBaseHostnameVerifier.java
 
b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/HBaseHostnameVerifier.java
index a703f5ff630..60ec927cfcf 100644
--- 
a/hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/HBaseHostnameVerifier.java
+++ 
b/hbase-common/src/main/java/org/apache/hadoop/hbase/io/crypto/tls/HBaseHostnameVerifier.java
@@ -17,7 +17,6 @@
  */
 package org.apache.hadoop.hbase.io.crypto.tls;
 
-import java.net.InetAddress;
 import java.security.cert.Certificate;
 import java.security.cert.CertificateParsingException;
 import java.security.cert.X509Certificate;
@@ -28,7 +27,6 @@ import java.util.List;
 import java.util.Locale;
 import java.util.NoSuchElementException;
 import java.util.Objects;
-import java.util.Optional;
 import javax.naming.InvalidNameException;
 import javax.naming.NamingException;
 import javax.naming.directory.Attribute;
@@ -40,12 +38,11 @@ import javax.net.ssl.SSLException;
 import javax.net.ssl.SSLPeerUnverifiedException;
 import javax.net.ssl.SSLSession;
 import javax.security.auth.x500.X500Principal;
+import org.apache.hadoop.hbase.util.Strings;
 import org.apache.yetus.audience.InterfaceAudience;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import org.apache.hbase.thirdparty.com.google.common.net.InetAddresses;
-
 /**
  * When enabled in {@link X509Util}, handles verifying that the hostname of a 
peer matches the
  * certificate it presents.
@@ -112,9 +109,8 @@ final class HBaseHostnameVerifier implements 
HostnameVerifier {
   void verify(final String host, final X509Certificate cert) throws 
SSLException {
     final List<SubjectName> subjectAlts = getSubjectAltNames(cert);
     if (subjectAlts != null && !subjectAlts.isEmpty()) {
-      Optional<InetAddress> inetAddress = parseIpAddress(host);
-      if (inetAddress.isPresent()) {
-        matchIPAddress(host, inetAddress.get(), subjectAlts);
+      if (Strings.isInetAddress(host)) {
+        matchIPAddress(host, subjectAlts);
       } else {
         matchDNSName(host, subjectAlts);
       }
@@ -131,14 +127,14 @@ final class HBaseHostnameVerifier implements 
HostnameVerifier {
     }
   }
 
-  private static void matchIPAddress(final String host, final InetAddress 
inetAddress,
-    final List<SubjectName> subjectAlts) throws SSLException {
+  private static void matchIPAddress(final String host, final 
List<SubjectName> subjectAlts)
+    throws SSLException {
     for (final SubjectName subjectAlt : subjectAlts) {
-      if (subjectAlt.getType() == SubjectName.IP) {
-        Optional<InetAddress> parsed = parseIpAddress(subjectAlt.getValue());
-        if (parsed.filter(altAddr -> altAddr.equals(inetAddress)).isPresent()) 
{
-          return;
-        }
+      if (
+        subjectAlt.getType() == SubjectName.IP
+          && Strings.hostnamesEqual(host, subjectAlt.getValue())
+      ) {
+        return;
       }
     }
     throw new SSLPeerUnverifiedException("Certificate for <" + host + "> 
doesn't match any "
@@ -230,32 +226,6 @@ final class HBaseHostnameVerifier implements 
HostnameVerifier {
     }
   }
 
-  private static Optional<InetAddress> parseIpAddress(String host) {
-    host = host.trim();
-    // Uri strings only work for ipv6 and are wrapped with brackets
-    // Unfortunately InetAddresses can't handle a mixed input, so we
-    // check here and choose which parse method to use.
-    if (host.startsWith("[") && host.endsWith("]")) {
-      return parseIpAddressUriString(host);
-    } else {
-      return parseIpAddressString(host);
-    }
-  }
-
-  private static Optional<InetAddress> parseIpAddressUriString(String host) {
-    if (InetAddresses.isUriInetAddress(host)) {
-      return Optional.of(InetAddresses.forUriString(host));
-    }
-    return Optional.empty();
-  }
-
-  private static Optional<InetAddress> parseIpAddressString(String host) {
-    if (InetAddresses.isInetAddress(host)) {
-      return Optional.of(InetAddresses.forString(host));
-    }
-    return Optional.empty();
-  }
-
   @SuppressWarnings("MixedMutabilityReturnType")
   private static List<SubjectName> getSubjectAltNames(final X509Certificate 
cert) {
     try {
diff --git 
a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Strings.java 
b/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Strings.java
index c1d860317b8..d35232e8448 100644
--- a/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Strings.java
+++ b/hbase-common/src/main/java/org/apache/hadoop/hbase/util/Strings.java
@@ -17,11 +17,14 @@
  */
 package org.apache.hadoop.hbase.util;
 
+import java.net.InetAddress;
+import java.util.Objects;
 import org.apache.commons.lang3.StringUtils;
 import org.apache.yetus.audience.InterfaceAudience;
 
 import org.apache.hbase.thirdparty.com.google.common.base.Joiner;
 import org.apache.hbase.thirdparty.com.google.common.base.Splitter;
+import org.apache.hbase.thirdparty.com.google.common.net.InetAddresses;
 
 /**
  * Utility for Strings.
@@ -79,6 +82,51 @@ public final class Strings {
     return dnPtr.endsWith(".") ? dnPtr.substring(0, dnPtr.length() - 1) : 
dnPtr;
   }
 
+  /**
+   * Returns whether the given string is an IP address, including bracketed 
IPv6 URI form.
+   * @param host hostname or IP
+   * @return {@code true} if {@code host} is an IP address
+   * @throws NullPointerException if {@code host} is {@code null}
+   */
+  public static boolean isInetAddress(String host) {
+    Objects.requireNonNull(host, "Hostname or IP cannot be null");
+    host = host.trim();
+    if (host.startsWith("[") && host.endsWith("]")) {
+      return InetAddresses.isUriInetAddress(host);
+    }
+    return InetAddresses.isInetAddress(host);
+  }
+
+  private static InetAddress parseInetAddress(String host) {
+    host = host.trim();
+    if (host.startsWith("[") && host.endsWith("]")) {
+      return InetAddresses.forUriString(host);
+    }
+    return InetAddresses.forString(host);
+  }
+
+  /**
+   * Compare two host identifiers for equality. DNS hostnames are compared 
case-insensitively
+   * because DNS labels are case-insensitive. IP address literals are compared 
by numeric address.
+   * @param left  first hostname or IP
+   * @param right second hostname or IP
+   * @return {@code true} if both refer to the same host identifier
+   * @throws NullPointerException if either argument is {@code null}
+   */
+  public static boolean hostnamesEqual(String left, String right) {
+    Objects.requireNonNull(left, "Hostname or IP cannot be null");
+    Objects.requireNonNull(right, "Hostname or IP cannot be null");
+    boolean leftIsIp = isInetAddress(left);
+    boolean rightIsIp = isInetAddress(right);
+    if (leftIsIp != rightIsIp) {
+      return false;
+    }
+    if (leftIsIp) {
+      return parseInetAddress(left).equals(parseInetAddress(right));
+    }
+    return left.equalsIgnoreCase(right);
+  }
+
   /**
    * Push the input string to the right by appending a character before it, 
usually a space.
    * @param input   the string to pad
diff --git 
a/hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestStrings.java 
b/hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestStrings.java
new file mode 100644
index 00000000000..be5d8aa97b9
--- /dev/null
+++ b/hbase-common/src/test/java/org/apache/hadoop/hbase/util/TestStrings.java
@@ -0,0 +1,48 @@
+/*
+ * 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.hbase.util;
+
+import static org.junit.jupiter.api.Assertions.assertFalse;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import org.apache.hadoop.hbase.testclassification.MiscTests;
+import org.apache.hadoop.hbase.testclassification.SmallTests;
+import org.junit.jupiter.api.Tag;
+import org.junit.jupiter.api.Test;
+
+@Tag(MiscTests.TAG)
+@Tag(SmallTests.TAG)
+public class TestStrings {
+
+  @Test
+  public void testHostnamesEqual() {
+    assertTrue(Strings.hostnamesEqual("HOST.example.com", "host.example.com"));
+    assertTrue(Strings.hostnamesEqual("rs1", "RS1"));
+    assertFalse(Strings.hostnamesEqual("host-a.example.com", 
"host-b.example.com"));
+    assertTrue(Strings.hostnamesEqual("10.0.0.1", "10.0.0.1"));
+    assertFalse(Strings.hostnamesEqual("10.0.0.1", "10.0.0.2"));
+    assertFalse(Strings.hostnamesEqual("HOST.example.com", "10.0.0.1"));
+    assertTrue(Strings.hostnamesEqual("::1", "0:0:0:0:0:0:0:1"));
+    
assertTrue(Strings.hostnamesEqual("[2001:0db8:85a3:0000:0000:8a2e:0370:7334]",
+      "2001:0db8:85a3:0000:0000:8a2e:0370:7334"));
+    assertThrows(NullPointerException.class, () -> 
Strings.hostnamesEqual(null, "host"));
+    assertThrows(NullPointerException.class, () -> 
Strings.hostnamesEqual("host", null));
+  }
+
+}
diff --git 
a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
 
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
index c2491cd02e4..d59b1b222fd 100644
--- 
a/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
+++ 
b/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
@@ -199,6 +199,7 @@ import org.apache.hadoop.hbase.util.RetryCounter;
 import org.apache.hadoop.hbase.util.RetryCounterFactory;
 import org.apache.hadoop.hbase.util.ServerRegionReplicaUtil;
 import org.apache.hadoop.hbase.util.Sleeper;
+import org.apache.hadoop.hbase.util.Strings;
 import org.apache.hadoop.hbase.util.Threads;
 import org.apache.hadoop.hbase.util.VersionInfo;
 import org.apache.hadoop.hbase.wal.AbstractFSWALProvider;
@@ -1718,8 +1719,9 @@ public class HRegionServer extends Thread
             expectedHostName = 
rpcServices.getSocketAddress().getAddress().getHostAddress();
           }
           boolean isHostnameConsist = 
StringUtils.isBlank(useThisHostnameInstead)
-            ? hostnameFromMasterPOV.equals(expectedHostName)
-            : hostnameFromMasterPOV.equals(useThisHostnameInstead);
+            ? Strings.hostnamesEqual(hostnameFromMasterPOV, expectedHostName)
+            : Strings.hostnamesEqual(hostnameFromMasterPOV, 
useThisHostnameInstead);
+
           if (!isHostnameConsist) {
             String msg = "Master passed us a different hostname to use; was="
               + (StringUtils.isBlank(useThisHostnameInstead)

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