Ip filtering: Check correct path for default file

Also added logging, so that on start up a message is logged, if all
connections are rejected or the config file is not found.

Closes elastic/elasticsearch#48

Original commit: elastic/x-pack-elasticsearch@51f16d75ba

src/main/java/org/elasticsearch/shield/n2n/IPFilteringN2NAuthenticator.java

@@ -5,13 +5,13 @@
  */
 package org.elasticsearch.shield.n2n;
 
-import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ElasticsearchParseException;
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.component.AbstractComponent;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.jackson.dataformat.yaml.snakeyaml.error.YAMLException;
+import org.elasticsearch.common.logging.ESLogger;
 import org.elasticsearch.common.net.InetAddresses;
 import org.elasticsearch.common.netty.handler.ipfilter.IpFilterRule;
 import org.elasticsearch.common.netty.handler.ipfilter.IpSubnetFilterRule;
@@ -20,6 +20,7 @@ import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.common.xcontent.yaml.YamlXContent;
 import org.elasticsearch.env.Environment;
+import org.elasticsearch.shield.plugin.SecurityPlugin;
 import org.elasticsearch.watcher.FileChangesListener;
 import org.elasticsearch.watcher.FileWatcher;
 import org.elasticsearch.watcher.ResourceWatcherService;
@@ -51,7 +52,7 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
     public IPFilteringN2NAuthenticator(Settings settings, Environment env, ResourceWatcherService watcherService) {
         super(settings);
         file = resolveFile(componentSettings, env);
-        rules = parseFile(file);
+        rules = parseFile(file, logger);
         watcher = new FileWatcher(file.getParent().toFile());
         watcher.addListener(new FileListener());
         watcherService.add(watcher);
@@ -60,13 +61,15 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
     private Path resolveFile(Settings settings, Environment env) {
         String location = settings.get("file");
         if (location == null) {
-            return env.configFile().toPath().resolve(DEFAULT_FILE);
+            File shieldDirectory = new File(env.configFile(), SecurityPlugin.NAME);
+            return shieldDirectory.toPath().resolve(DEFAULT_FILE);
         }
         return Paths.get(location);
     }
 
-    public static IpFilterRule[] parseFile(Path path) {
+    public static IpFilterRule[] parseFile(Path path, ESLogger logger) {
         if (!Files.exists(path)) {
+            logger.info("No IP filtering rules loaded, as file {} does not exist. Rejecting all incoming connections!", path);
             return NO_RULES;
         }
 
@@ -109,8 +112,11 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
         }
 
         if (rules.size() == 0) {
+            logger.info("No IP filtering rules loaded. Rejecting all incoming connections!");
             return NO_RULES;
         }
+
+        logger.debug("Loaded {} ip filtering rules", rules.size());
         return rules.toArray(new IpFilterRule[rules.size()]);
     }
 
@@ -130,9 +136,13 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
     public boolean authenticate(@Nullable Principal peerPrincipal, InetAddress peerAddress, int peerPort) {
         for (int i = 0; i < rules.length; i++) {
             if (rules[i].contains(peerAddress)) {
-                return rules[i].isAllowRule();
+                boolean isAllowed =  rules[i].isAllowRule();
+                logger.trace("Authentication rule matched for host [{}]: {}", peerAddress, isAllowed);
+                return isAllowed;
             }
         }
+
+        logger.trace("Rejecting host {}", peerAddress);
         return false;
     }
 
@@ -140,7 +150,7 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
         @Override
         public void onFileCreated(File file) {
             if (file.equals(IPFilteringN2NAuthenticator.this.file.toFile())) {
-                rules = parseFile(file.toPath());
+                rules = parseFile(file.toPath(), logger);
             }
         }
 
@@ -154,9 +164,7 @@ public class IPFilteringN2NAuthenticator extends AbstractComponent implements N2
         @Override
         public void onFileChanged(File file) {
             if (file.equals(IPFilteringN2NAuthenticator.this.file.toFile())) {
-                if (file.equals(IPFilteringN2NAuthenticator.this.file.toFile())) {
+                rules = parseFile(file.toPath(), logger);
-                    rules = parseFile(file.toPath());
-                }
             }
         }
     }

src/test/java/org/elasticsearch/shield/n2n/IPFilteringN2NAuthenticatorTests.java

@@ -44,6 +44,8 @@ public class IPFilteringN2NAuthenticatorTests extends ElasticsearchTestCase {
     @Rule
     public TemporaryFolder temporaryFolder = new TemporaryFolder();
 
+    private final Settings resourceWatcherServiceSettings = settingsBuilder().put("watcher.interval.medium", TimeValue.timeValueMillis(200)).build();
+
     private ResourceWatcherService resourceWatcherService;
     private File configFile;
     private Settings settings;
@@ -137,12 +139,11 @@ public class IPFilteringN2NAuthenticatorTests extends ElasticsearchTestCase {
     @Test(expected = ElasticsearchParseException.class)
     public void testThatInvalidFileThrowsCorrectException() throws Exception {
         writeConfigFile("deny: all allow: all \n\n");
-        IPFilteringN2NAuthenticator.parseFile(configFile.toPath());
+        IPFilteringN2NAuthenticator.parseFile(configFile.toPath(), logger);
     }
 
     private void writeConfigFile(String data) throws IOException {
         Files.write(data.getBytes(Charsets.UTF_8), configFile);
-        Settings resourceWatcherServiceSettings = settingsBuilder().put("watcher.interval.medium", TimeValue.timeValueMillis(200)).build();
         resourceWatcherService = new ResourceWatcherService(resourceWatcherServiceSettings, new ThreadPool("resourceWatcher")).start();
         settings = settingsBuilder().put("shield.n2n.file", configFile.getPath()).build();
         ipFilteringN2NAuthenticator = new IPFilteringN2NAuthenticator(settings, new Environment(), resourceWatcherService);

src/test/java/org/elasticsearch/shield/n2n/IpFilteringIntegrationTests.java

@@ -6,7 +6,7 @@
 package org.elasticsearch.shield.n2n;
 
 import com.google.common.base.Charsets;
-import com.google.common.net.InetAddresses;
+import org.elasticsearch.common.settings.ImmutableSettings;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.InetSocketTransportAddress;
 import org.elasticsearch.common.transport.TransportAddress;
@@ -18,11 +18,9 @@ import org.junit.Test;
 import java.io.File;
 import java.io.InputStream;
 import java.io.OutputStream;
-import java.net.HttpURLConnection;
+import java.net.InetSocketAddress;
 import java.net.Socket;
 import java.net.SocketException;
-import java.net.URL;
-import java.util.Locale;
 
 import static org.elasticsearch.common.settings.ImmutableSettings.settingsBuilder;
 import static org.elasticsearch.test.ElasticsearchIntegrationTest.ClusterScope;
@@ -38,12 +36,16 @@ public class IpFilteringIntegrationTests extends ShieldIntegrationTest {
 
     @Override
     protected Settings nodeSettings(int nodeOrdinal) {
-        File folder = newFolder();
+        ImmutableSettings.Builder builder = settingsBuilder().put(super.nodeSettings(nodeOrdinal));
+        // either deny all or do not have a configuration file, as this denies by default
+        if (getRandom().nextBoolean()) {
+            File folder = newFolder();
+            builder.put("shield.n2n.file", writeFile(folder, "ip_filter.yml", CONFIG_IPFILTER_DENY_ALL));
+        } else {
+            builder.remove("shield.n2n.file");
+        }
 
-        return settingsBuilder()
+        return builder.build();
-                .put(super.nodeSettings(nodeOrdinal))
-                .put("shield.n2n.file", writeFile(folder, "ip_filter.yml", CONFIG_IPFILTER_DENY_ALL))
-                .build();
     }
 
     @Test(expected = SocketException.class)
@@ -51,21 +53,22 @@ public class IpFilteringIntegrationTests extends ShieldIntegrationTest {
         TransportAddress transportAddress = internalCluster().getDataNodeInstance(HttpServerTransport.class).boundAddress().boundAddress();
         assertThat(transportAddress, is(instanceOf(InetSocketTransportAddress.class)));
         InetSocketTransportAddress inetSocketTransportAddress = (InetSocketTransportAddress) transportAddress;
-        String url = String.format(Locale.ROOT, "http://%s:%s/", InetAddresses.toUriString(inetSocketTransportAddress.address().getAddress()), inetSocketTransportAddress.address().getPort());
 
-        logger.info("Opening connection to {}", url);
+        trySocketConnection(inetSocketTransportAddress.address());
-        HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
-        connection.connect();
-        logger.info("HTTP connection response code [{}]", connection.getResponseCode());
     }
 
     @Test(expected = SocketException.class)
     public void testThatIpFilteringIsIntegratedIntoNettyPipelineViaTransportClient() throws Exception {
-        InetSocketTransportAddress transportAddress = (InetSocketTransportAddress) internalCluster().getDataNodeInstance(Transport.class).boundAddress().boundAddress();
+        TransportAddress transportAddress = (InetSocketTransportAddress) internalCluster().getDataNodeInstance(Transport.class).boundAddress().boundAddress();
+        assertThat(transportAddress, is(instanceOf(InetSocketTransportAddress.class)));
+        InetSocketTransportAddress inetSocketTransportAddress = (InetSocketTransportAddress) transportAddress;
+        trySocketConnection(inetSocketTransportAddress.address());
+    }
 
+    private void trySocketConnection(InetSocketAddress address) throws Exception {
         try (Socket socket = new Socket()) {
-            logger.info("Connecting to {}", transportAddress.address());
+            logger.info("Connecting to {}", address);
-            socket.connect(transportAddress.address(), 500);
+            socket.connect(address, 500);
 
             assertThat(socket.isConnected(), is(true));
             try (OutputStream os = socket.getOutputStream()) {