Patch Shell class in hdfs to not execute (elastic#119189)

Shell utility in hdfs tries to execute a local script statically to
determine whether setsid is available. With the security manager this
doesn't work, but hdfs catches the SecurityException and assumes false.
With entitlements this doesn't work since hdfs does not know about our
NotEntitledException.

This commit reworks the patching of hdfs-client-api to use asm. It then
adds patching of hdfs' Shell class to replace the method that tries to
execute.

build-tools-internal/src/main/groovy/elasticsearch.ide.gradle

@@ -132,7 +132,7 @@ if (providers.systemProperty('idea.active').getOrNull() == 'true') {
   tasks.register('buildDependencyArtifacts') {
     group = 'ide'
     description = 'Builds artifacts needed as dependency for IDE modules'
-    dependsOn([':plugins:repository-hdfs:hadoop-client-api:shadowJar',
+    dependsOn([':plugins:repository-hdfs:hadoop-client-api:jar',
       ':x-pack:plugin:esql:compute:ann:jar',
       ':x-pack:plugin:esql:compute:gen:jar',
       ':server:generateModulesList',

plugins/repository-hdfs/build.gradle

@@ -29,7 +29,7 @@ configurations {
 }
 
 dependencies {
-  api project(path: 'hadoop-client-api', configuration: 'shadow')
+  api project(path: 'hadoop-client-api', configuration: 'default')
   if (isEclipse) {
     /*
      * Eclipse can't pick up the shadow dependency so we point it at *something*

plugins/repository-hdfs/hadoop-client-api/build.gradle

@@ -1,16 +1,46 @@
-apply plugin: 'elasticsearch.build'
-apply plugin: 'com.gradleup.shadow'
+apply plugin: 'elasticsearch.java'
+
+sourceSets {
+  patcher
+}
+
+configurations {
+  thejar {
+    canBeResolved = true
+  }
+}
 
 dependencies {
-  implementation "org.apache.hadoop:hadoop-client-api:${project.parent.versions.hadoop}"
+  thejar("org.apache.hadoop:hadoop-client-api:${project.parent.versions.hadoop}") {
+    transitive = false
+  }
+
+  patcherImplementation 'org.ow2.asm:asm:9.7.1'
+  patcherImplementation 'org.ow2.asm:asm-tree:9.7.1'
 }
 
-tasks.named('shadowJar').configure {
-  exclude 'org/apache/hadoop/util/ShutdownHookManager$*.class'
+def outputDir = layout.buildDirectory.dir("patched-classes")
+
+def patchTask = tasks.register("patchClasses", JavaExec) {
+  inputs.files(configurations.thejar).withPathSensitivity(PathSensitivity.RELATIVE)
+  inputs.files(sourceSets.patcher.output).withPathSensitivity(PathSensitivity.RELATIVE)
+  outputs.dir(outputDir)
+  classpath = sourceSets.patcher.runtimeClasspath
+  mainClass = 'org.elasticsearch.hdfs.patch.HdfsClassPatcher'
+  doFirst {
+    args(configurations.thejar.singleFile, outputDir.get().asFile)
+  }
 }
 
-['jarHell', 'thirdPartyAudit', 'forbiddenApisMain', 'splitPackagesAudit'].each {
-  tasks.named(it).configure {
-    enabled = false
+tasks.named('jar').configure {
+  dependsOn(configurations.thejar)
+
+  from(patchTask)
+  from({ project.zipTree(configurations.thejar.singleFile) }) {
+    eachFile {
+      if (outputDir.get().file(it.relativePath.pathString).asFile.exists()) {
+        it.exclude()
+      }
+    }
   }
 }

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/HdfsClassPatcher.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+
+import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+
+public class HdfsClassPatcher {
+    static final Map<String, Function<ClassWriter, ClassVisitor>> patchers = Map.of(
+        "org/apache/hadoop/util/ShutdownHookManager.class",
+        ShutdownHookManagerPatcher::new,
+        "org/apache/hadoop/util/Shell.class",
+        ShellPatcher::new
+    );
+
+    public static void main(String[] args) throws Exception {
+        String jarPath = args[0];
+        Path outputDir = Paths.get(args[1]);
+
+        try (JarFile jarFile = new JarFile(new File(jarPath))) {
+            for (var patcher : patchers.entrySet()) {
+                JarEntry jarEntry = jarFile.getJarEntry(patcher.getKey());
+                if (jarEntry == null) {
+                    throw new IllegalArgumentException("path [" + patcher.getKey() + "] not found in [" + jarPath + "]");
+                }
+                byte[] classToPatch = jarFile.getInputStream(jarEntry).readAllBytes();
+
+                ClassReader classReader = new ClassReader(classToPatch);
+                ClassWriter classWriter = new ClassWriter(classReader, 0);
+                classReader.accept(patcher.getValue().apply(classWriter), 0);
+
+                Path outputFile = outputDir.resolve(patcher.getKey());
+                Files.createDirectories(outputFile.getParent());
+                Files.write(outputFile, classWriter.toByteArray());
+            }
+        }
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/MethodReplacement.java

@@ -0,0 +1,36 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+public class MethodReplacement extends MethodVisitor {
+    private final MethodVisitor delegate;
+    private final Runnable bodyWriter;
+
+    MethodReplacement(MethodVisitor delegate, Runnable bodyWriter) {
+        super(Opcodes.ASM9);
+        this.delegate = delegate;
+        this.bodyWriter = bodyWriter;
+    }
+
+    @Override
+    public void visitCode() {
+        // delegate.visitCode();
+        bodyWriter.run();
+        // delegate.visitEnd();
+    }
+
+    @Override
+    public void visitMaxs(int maxStack, int maxLocals) {
+        delegate.visitMaxs(maxStack, maxLocals);
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/ShellPatcher.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+
+class ShellPatcher extends ClassVisitor {
+
+    ShellPatcher(ClassWriter classWriter) {
+        super(Opcodes.ASM9, classWriter);
+    }
+
+    @Override
+    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+        MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
+        if (name.equals("isSetsidSupported")) {
+            return new MethodReplacement(mv, () -> {
+                mv.visitInsn(Opcodes.ICONST_0);
+                mv.visitInsn(Opcodes.IRETURN);
+            });
+        }
+        return mv;
+    }
+}

plugins/repository-hdfs/hadoop-client-api/src/patcher/java/org/elasticsearch/hdfs/patch/ShutdownHookManagerPatcher.java

@@ -0,0 +1,66 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the "Elastic License
+ * 2.0", the "GNU Affero General Public License v3.0 only", and the "Server Side
+ * Public License v 1"; you may not use this file except in compliance with, at
+ * your election, the "Elastic License 2.0", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.hdfs.patch;
+
+import org.objectweb.asm.ClassVisitor;
+import org.objectweb.asm.ClassWriter;
+import org.objectweb.asm.MethodVisitor;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.Type;
+
+import java.util.Set;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.TimeUnit;
+
+class ShutdownHookManagerPatcher extends ClassVisitor {
+    private static final String CLASSNAME = "org/apache/hadoop/util/ShutdownHookManager";
+    private static final Set<String> VOID_METHODS = Set.of("addShutdownHook", "clearShutdownHooks");
+    private static final Set<String> BOOLEAN_METHODS = Set.of("removeShutdownHook", "hasShutdownHook", "isShutdownInProgress");
+
+    ShutdownHookManagerPatcher(ClassWriter classWriter) {
+        super(Opcodes.ASM9, classWriter);
+    }
+
+    @Override
+    public MethodVisitor visitMethod(int access, String name, String descriptor, String signature, String[] exceptions) {
+        MethodVisitor mv = super.visitMethod(access, name, descriptor, signature, exceptions);
+        if (VOID_METHODS.contains(name)) {
+            // make void methods noops
+            return new MethodReplacement(mv, () -> { mv.visitInsn(Opcodes.RETURN); });
+        } else if (BOOLEAN_METHODS.contains(name)) {
+            // make boolean methods always return false
+            return new MethodReplacement(mv, () -> {
+                mv.visitInsn(Opcodes.ICONST_0);
+                mv.visitInsn(Opcodes.IRETURN);
+            });
+        } else if (name.equals("<clinit>")) {
+            return new MethodReplacement(mv, () -> {
+                // just initialize the statics, don't actually get runtime to add shutdown hook
+
+                var classType = Type.getObjectType(CLASSNAME);
+                mv.visitTypeInsn(Opcodes.NEW, CLASSNAME);
+                mv.visitInsn(Opcodes.DUP);
+                mv.visitMethodInsn(Opcodes.INVOKESPECIAL, CLASSNAME, "<init>", "()V", false);
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "MGR", classType.getDescriptor());
+
+                var timeUnitType = Type.getType(TimeUnit.class);
+                mv.visitFieldInsn(Opcodes.GETSTATIC, timeUnitType.getInternalName(), "SECONDS", timeUnitType.getDescriptor());
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "TIME_UNIT_DEFAULT", timeUnitType.getDescriptor());
+
+                var executorServiceType = Type.getType(ExecutorService.class);
+                mv.visitInsn(Opcodes.ACONST_NULL);
+                mv.visitFieldInsn(Opcodes.PUTSTATIC, CLASSNAME, "EXECUTOR", executorServiceType.getDescriptor());
+
+                mv.visitInsn(Opcodes.RETURN);
+            });
+        }
+        return mv;
+    }
+}