tinaselenge commented on code in PR #14995:
URL: https://github.com/apache/kafka/pull/14995#discussion_r1439364385


##########
clients/src/test/java/org/apache/kafka/common/config/provider/FileConfigProviderTest.java:
##########
@@ -98,8 +117,91 @@ public void testServiceLoaderDiscovery() {
     public static class TestFileConfigProvider extends FileConfigProvider {
 
         @Override
-        protected Reader reader(String path) throws IOException {
+        protected Reader reader(Path path) throws IOException {
             return new 
StringReader("testKey=testResult\ntestKey2=testResult2");
         }
     }
+
+    @Test
+    public void testAllowedDirPath() {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dir);
+        configProvider.configure(configs);
+
+        ConfigData configData = configProvider.get(dirFile);
+        Map<String, String> result = new HashMap<>();
+        result.put("testKey", "testResult");
+        result.put("testKey2", "testResult2");
+        assertEquals(result, configData.data());
+        assertNull(configData.ttl());
+    }
+
+    @Test
+    public void testAllowedFilePath() {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dirFile);
+        configProvider.configure(configs);
+
+        ConfigData configData = configProvider.get(dirFile);
+        Map<String, String> result = new HashMap<>();
+        result.put("testKey", "testResult");
+        result.put("testKey2", "testResult2");
+        assertEquals(result, configData.data());
+        assertNull(configData.ttl());
+    }
+
+    @Test
+    public void testMultipleAllowedPaths() {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dir + "," + siblingDir);
+        configProvider.configure(configs);
+
+        Map<String, String> result = new HashMap<>();
+        result.put("testKey", "testResult");
+        result.put("testKey2", "testResult2");
+
+        ConfigData configData = configProvider.get(dirFile);
+        assertEquals(result, configData.data());
+        assertNull(configData.ttl());
+
+        configData = configProvider.get(siblingDirFile);
+        assertEquals(result, configData.data());
+        assertNull(configData.ttl());
+    }
+
+    @Test
+    public void testNotAllowedDirPath() {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dir);
+        configProvider.configure(configs);
+
+        ConfigData configData = configProvider.get(siblingDirFile);
+        assertTrue(configData.data().isEmpty());
+        assertNull(configData.ttl());
+    }
+
+    @Test
+    public void testNotAllowedFilePath() throws IOException {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dirFile);
+        configProvider.configure(configs);
+
+        //another file under the same directory
+        Path dirFile2 = Files.createFile(Paths.get(dir, "dirFile2"));
+        ConfigData configData = configProvider.get(dirFile2.toString());
+        assertTrue(configData.data().isEmpty());
+        assertNull(configData.ttl());
+    }
+
+    @Test
+    public void testNoTraversal() {
+        Map<String, String> configs = new HashMap<>();
+        configs.put(ALLOWED_PATHS_CONFIG, dirFile);
+        configProvider.configure(configs);
+
+        // Check we can't escape outside the path directory
+        ConfigData configData = configProvider.get(dir + 
"../siblingdir/siblingdirFile");

Review Comment:
   good catch! I have fixed these now. 



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