HADOOP-14260. Configuration.dumpConfiguration should redact sensitive information. Contributed by John Zhuge.

hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/conf/Configuration.java

@@ -3146,7 +3146,8 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
       JsonGenerator dumpGenerator = dumpFactory.createGenerator(out);
       dumpGenerator.writeStartObject();
       dumpGenerator.writeFieldName("property");
-      appendJSONProperty(dumpGenerator, config, propertyName);
+      appendJSONProperty(dumpGenerator, config, propertyName,
+          new ConfigRedactor(config));
       dumpGenerator.writeEndObject();
       dumpGenerator.flush();
     }
@@ -3186,11 +3187,11 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
     dumpGenerator.writeFieldName("properties");
     dumpGenerator.writeStartArray();
     dumpGenerator.flush();
+    ConfigRedactor redactor = new ConfigRedactor(config);
     synchronized (config) {
       for (Map.Entry<Object,Object> item: config.getProps().entrySet()) {
-        appendJSONProperty(dumpGenerator,
+        appendJSONProperty(dumpGenerator, config, item.getKey().toString(),
-            config,
+            redactor);
-            item.getKey().toString());
       }
     }
     dumpGenerator.writeEndArray();
@@ -3208,12 +3209,14 @@ public class Configuration implements Iterable<Map.Entry<String,String>>,
    * @throws IOException
    */
   private static void appendJSONProperty(JsonGenerator jsonGen,
-      Configuration config, String name) throws IOException {
+      Configuration config, String name, ConfigRedactor redactor)
+      throws IOException {
     // skip writing if given property name is empty or null
     if(!Strings.isNullOrEmpty(name) && jsonGen != null) {
       jsonGen.writeStartObject();
       jsonGen.writeStringField("key", name);
-      jsonGen.writeStringField("value", config.get(name));
+      jsonGen.writeStringField("value",
+          redactor.redact(name, config.get(name)));
       jsonGen.writeBooleanField("isFinal",
           config.finalParameters.contains(name));
       String[] resources = config.updatingResource.get(name);

hadoop-common-project/hadoop-common/src/test/java/org/apache/hadoop/conf/TestConfiguration.java

@@ -49,6 +49,7 @@ import static org.junit.Assert.assertArrayEquals;
 
 import org.apache.commons.lang.StringUtils;
 import org.apache.hadoop.conf.Configuration.IntegerRanges;
+import org.apache.hadoop.fs.CommonConfigurationKeysPublic;
 import org.apache.hadoop.fs.Path;
 import org.apache.hadoop.io.IOUtils;
 import org.apache.hadoop.net.NetUtils;
@@ -82,6 +83,11 @@ public class TestConfiguration extends TestCase {
   /** Four apostrophes. */
   public static final String ESCAPED = "''''";
 
+  private static final String SENSITIVE_CONFIG_KEYS =
+      CommonConfigurationKeysPublic.HADOOP_SECURITY_SENSITIVE_CONFIG_KEYS;
+
+  private BufferedWriter out;
+
   @Override
   protected void setUp() throws Exception {
     super.setUp();
@@ -90,6 +96,9 @@ public class TestConfiguration extends TestCase {
   
   @Override
   protected void tearDown() throws Exception {
+    if(out != null) {
+      out.close();
+    }
     super.tearDown();
     new File(CONFIG).delete();
     new File(CONFIG2).delete();
@@ -878,8 +887,6 @@ public class TestConfiguration extends TestCase {
     new File(new File(relConfig).getParent()).delete();
   }
 
-  BufferedWriter out;
-	
   public void testIntegerRanges() {
     Configuration conf = new Configuration();
     conf.set("first", "-100");
@@ -1787,8 +1794,41 @@ public class TestConfiguration extends TestCase {
       assertEquals(fileResource.toString(),prop.getResource());
     }
   }
-  
+
-    
+  public void testDumpSensitiveProperty() throws IOException {
+    final String myPassword = "ThisIsMyPassword";
+    Configuration testConf = new Configuration(false);
+    out = new BufferedWriter(new FileWriter(CONFIG));
+    startConfig();
+    appendProperty("test.password", myPassword);
+    endConfig();
+    Path fileResource = new Path(CONFIG);
+    testConf.addResource(fileResource);
+
+    try (StringWriter outWriter = new StringWriter()) {
+      testConf.set(SENSITIVE_CONFIG_KEYS, "password$");
+      Configuration.dumpConfiguration(testConf, "test.password", outWriter);
+      assertFalse(outWriter.toString().contains(myPassword));
+    }
+  }
+
+  public void testDumpSensitiveConfiguration() throws IOException {
+    final String myPassword = "ThisIsMyPassword";
+    Configuration testConf = new Configuration(false);
+    out = new BufferedWriter(new FileWriter(CONFIG));
+    startConfig();
+    appendProperty("test.password", myPassword);
+    endConfig();
+    Path fileResource = new Path(CONFIG);
+    testConf.addResource(fileResource);
+
+    try (StringWriter outWriter = new StringWriter()) {
+      testConf.set(SENSITIVE_CONFIG_KEYS, "password$");
+      Configuration.dumpConfiguration(testConf, outWriter);
+      assertFalse(outWriter.toString().contains(myPassword));
+    }
+  }
+
   public void testGetValByRegex() {
     Configuration conf = new Configuration();
     String key1 = "t.abc.key1";