Revert "Adding support for TLS connections for gRPC clients"

This reverts commit 47a3aa697049bf53e8dd4cb76cf9ca262762a175.

Change-Id: I457594c3f423f276b9c49dbbaf068284a36ba9f1
diff --git a/core/store/dist/BUILD b/core/store/dist/BUILD
index fb42f8d..e3e702c 100644
--- a/core/store/dist/BUILD
+++ b/core/store/dist/BUILD
@@ -3,10 +3,10 @@
     "//utils/rest:onlab-rest",
     "//core/store/serializers:onos-core-serializers",
     "@io_netty_netty_transport//jar",
-    "@io_netty_netty_transport_native_epoll//jar",
-    "@io_netty_netty_transport_native_unix_common//jar",
     "@io_netty_netty_codec//jar",
     "@io_netty_netty_handler//jar",
+    "@io_netty_netty_transport_native_epoll//jar",
+    "@io_netty_netty_transport_native_unix_common//jar",
     "@io_netty_netty_resolver//jar",
     "@commons_math3//jar",
 ]
diff --git a/lib/deps.json b/lib/deps.json
index cc17968..f21cca0 100644
--- a/lib/deps.json
+++ b/lib/deps.json
@@ -251,7 +251,6 @@
     "io_netty_netty_common": "mvn:io.netty:netty-common:4.1.27.Final",
     "io_netty_netty_handler": "mvn:io.netty:netty-handler:4.1.27.Final",
     "io_netty_netty_handler_proxy": "mvn:io.netty:netty-handler-proxy:4.1.27.Final",
-    "io_netty_netty_tcnative_boringssl": "mvn:io.netty:netty-tcnative-boringssl-static:2.0.12.Final",
     "io_netty_netty_transport": "mvn:io.netty:netty-transport:4.1.27.Final",
     "io_netty_netty_transport_native_unix_common": "mvn:io.netty:netty-transport-native-unix-common:4.1.27.Final",
     "io_netty_netty_transport-native-epoll": "mvn:io.netty:netty-transport-native-epoll:4.1.27.Final",
diff --git a/protocols/grpc/BUILD b/protocols/grpc/BUILD
index 2debf84..26e178c 100644
--- a/protocols/grpc/BUILD
+++ b/protocols/grpc/BUILD
@@ -18,11 +18,18 @@
     "@io_opencensus_opencensus_api//jar",
     "@io_opencensus_opencensus_contrib_grpc_metrics//jar",
     "@com_google_code_gson_gson//jar",
-    # Adding Netty http and http2 codecs
-    #     The rest of Netty is loaded in the onos-thirdparty-base feature
-    #     See tools/package/features/BUILD for more details
+    # Lazily adding all netty-related packages.
+    # Some of them might not be necessary.
+    "@io_netty_netty//jar",
+    "@io_netty_netty_buffer//jar",
+    "@io_netty_netty_codec//jar",
     "@io_netty_netty_codec_http//jar",
     "@io_netty_netty_codec_http2//jar",
+    "@io_netty_netty_common//jar",
+    "@io_netty_netty_handler//jar",
+    "@io_netty_netty_transport//jar",
+    "@io_netty_netty_transport_native_epoll//jar",
+    "@io_netty_netty_resolver//jar",
 ]
 
 onos_app(
diff --git a/protocols/grpc/ctl/BUILD b/protocols/grpc/ctl/BUILD
index 475a90e..ac0703d 100644
--- a/protocols/grpc/ctl/BUILD
+++ b/protocols/grpc/ctl/BUILD
@@ -3,7 +3,6 @@
     "//protocols/grpc/proto:onos-protocols-grpc-proto",
     "@io_grpc_grpc_java//core",
     "@io_grpc_grpc_java//netty",
-    "@io_netty_netty_handler//jar",
 ]
 
 osgi_jar(
diff --git a/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/AbstractGrpcClientController.java b/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/AbstractGrpcClientController.java
index db29284..375ff32 100644
--- a/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/AbstractGrpcClientController.java
+++ b/protocols/grpc/ctl/src/main/java/org/onosproject/grpc/ctl/AbstractGrpcClientController.java
@@ -19,11 +19,8 @@
 import com.google.common.collect.Maps;
 import com.google.common.util.concurrent.Striped;
 import io.grpc.ManagedChannel;
-import io.grpc.netty.GrpcSslContexts;
+import io.grpc.ManagedChannelBuilder;
 import io.grpc.netty.NettyChannelBuilder;
-import io.netty.handler.ssl.NotSslRecordException;
-import io.netty.handler.ssl.SslContext;
-import io.netty.handler.ssl.util.InsecureTrustManagerFactory;
 import org.onosproject.event.AbstractListenerManager;
 import org.onosproject.event.Event;
 import org.onosproject.event.EventListener;
@@ -39,14 +36,12 @@
 import org.osgi.service.component.annotations.ReferenceCardinality;
 import org.slf4j.Logger;
 
-import javax.net.ssl.SSLException;
 import java.io.IOException;
 import java.util.Map;
 import java.util.concurrent.locks.Lock;
 import java.util.function.Supplier;
 
 import static com.google.common.base.Preconditions.checkNotNull;
-import static com.google.common.base.Preconditions.checkState;
 import static org.slf4j.LoggerFactory.getLogger;
 
 /**
@@ -96,15 +91,10 @@
     @Override
     public boolean createClient(K clientKey) {
         checkNotNull(clientKey);
-        /*
-            FIXME we might want to move "useTls" and "fallback" to properties of the netcfg and clientKey
-                  For now, we will first try to connect with TLS (accepting any cert), then fall back to
-                  plaintext for every device
-         */
-        return withDeviceLock(() -> doCreateClient(clientKey, true, true), clientKey.deviceId());
+        return withDeviceLock(() -> doCreateClient(clientKey), clientKey.deviceId());
     }
 
-    private boolean doCreateClient(K clientKey, boolean useTls, boolean fallbackToPlainText) {
+    private boolean doCreateClient(K clientKey) {
         DeviceId deviceId = clientKey.deviceId();
         String serverAddr = clientKey.serverAddr();
         int serverPort = clientKey.serverPort();
@@ -122,57 +112,20 @@
                 doRemoveClient(deviceId);
             }
         }
-        log.info("Creating client for {} (server={}:{})...", deviceId, serverAddr, serverPort);
-
-        SslContext sslContext = null;
-        if (useTls) {
-            try {
-                // Accept any server certificate; this is insecure and should not be used in production
-                sslContext = GrpcSslContexts.forClient().trustManager(InsecureTrustManagerFactory.INSTANCE).build();
-            } catch (SSLException e) {
-                log.error("Failed to build SSL Context", e);
-                return false;
-            }
-        }
-
+        log.info("Creating client for {} (server={}:{})...",
+                deviceId, serverAddr, serverPort);
         GrpcChannelId channelId = GrpcChannelId.of(clientKey.deviceId(), clientKey.toString());
-        NettyChannelBuilder channelBuilder = NettyChannelBuilder
+        ManagedChannelBuilder channelBuilder = NettyChannelBuilder
                 .forAddress(serverAddr, serverPort)
-                .maxInboundMessageSize(DEFAULT_MAX_INBOUND_MSG_SIZE * MEGABYTES);
-        if (sslContext != null) {
-            log.debug("Using SSL for gRPC connection to {}", deviceId);
-            channelBuilder
-                    .sslContext(sslContext)
-                    .useTransportSecurity();
-        } else {
-            checkState(!useTls,
-                    "Not authorized to use plaintext for gRPC connection to {}", deviceId);
-            log.debug("Using plaintext TCP for gRPC connection to {}", deviceId);
-            channelBuilder.usePlaintext();
-        }
+                .maxInboundMessageSize(DEFAULT_MAX_INBOUND_MSG_SIZE * MEGABYTES)
+                .usePlaintext();
 
         ManagedChannel channel;
         try {
             channel = grpcChannelController.connectChannel(channelId, channelBuilder);
         } catch (IOException e) {
-            for (Throwable cause = e; cause != null; cause = cause.getCause()) {
-                if (useTls && cause instanceof NotSslRecordException) {
-                    // Likely root cause is that server is using plaintext
-                    log.info("Failed to connect to server (device={}) using TLS", deviceId);
-                    log.debug("TLS connection exception", e);
-                    if (fallbackToPlainText) {
-                        log.info("Falling back to plaintext for connection to {}", deviceId);
-                        return doCreateClient(clientKey, false, false);
-                    }
-                }
-                if (!useTls && "Connection reset by peer".equals(cause.getMessage())) {
-                    // Not a great signal, but could indicate the server is expected a TLS connection
-                    log.error("Failed to connect to server (device={}) using plaintext TCP; is the server using TLS?",
-                            deviceId);
-                    break;
-                }
-            }
-            log.warn("Unable to connect to gRPC server for {}", deviceId, e);
+            log.warn("Unable to connect to gRPC server of {}: {}",
+                    clientKey.deviceId(), e.getMessage());
             return false;
         }
 
diff --git a/tools/build/bazel/generate_workspace.bzl b/tools/build/bazel/generate_workspace.bzl
index 69c8326..494eedd 100644
--- a/tools/build/bazel/generate_workspace.bzl
+++ b/tools/build/bazel/generate_workspace.bzl
@@ -1,4 +1,4 @@
-# ***** This file was auto-generated at Fri, 14 Dec 2018 00:07:54 GMT. Do not edit this file manually. *****
+# ***** This file was auto-generated at Tue, 27 Nov 2018 23:06:01 GMT. Do not edit this file manually. *****
 # ***** Use onos-lib-gen *****
 
 load("//tools/build/bazel:variables.bzl", "ONOS_GROUP_ID", "ONOS_VERSION")
@@ -771,12 +771,6 @@
             jar_sha256 = "84b00dd1cd25a99b88bd598577825b4be9ad592e2d78b08bd703e7e999fe3498",
             licenses = ["notice"],
             jar_urls = ["http://repo1.maven.org/maven2/io/netty/netty-handler-proxy/4.1.27.Final/netty-handler-proxy-4.1.27.Final.jar"],        )
-    if "io_netty_netty_tcnative_boringssl" not in native.existing_rules():
-        java_import_external(
-            name = "io_netty_netty_tcnative_boringssl",
-            jar_sha256 = "3df756e569504137e90ff368c2fe09f1f953efeddb717d47ed391dfa6ba8b7e3",
-            licenses = ["notice"],
-            jar_urls = ["http://repo1.maven.org/maven2/io/netty/netty-tcnative-boringssl-static/2.0.12.Final/netty-tcnative-boringssl-static-2.0.12.Final.jar"],        )
     if "io_netty_netty_transport" not in native.existing_rules():
         java_import_external(
             name = "io_netty_netty_transport",
@@ -1525,7 +1519,6 @@
 artifact_map["@io_netty_netty_common//:io_netty_netty_common"] = "mvn:io.netty:netty-common:jar:4.1.27.Final"
 artifact_map["@io_netty_netty_handler//:io_netty_netty_handler"] = "mvn:io.netty:netty-handler:jar:4.1.27.Final"
 artifact_map["@io_netty_netty_handler_proxy//:io_netty_netty_handler_proxy"] = "mvn:io.netty:netty-handler-proxy:jar:4.1.27.Final"
-artifact_map["@io_netty_netty_tcnative_boringssl//:io_netty_netty_tcnative_boringssl"] = "mvn:io.netty:netty-tcnative-boringssl-static:jar:2.0.12.Final"
 artifact_map["@io_netty_netty_transport//:io_netty_netty_transport"] = "mvn:io.netty:netty-transport:jar:4.1.27.Final"
 artifact_map["@io_netty_netty_transport_native_unix_common//:io_netty_netty_transport_native_unix_common"] = "mvn:io.netty:netty-transport-native-unix-common:jar:4.1.27.Final"
 artifact_map["@io_netty_netty_transport_native_epoll//:io_netty_netty_transport_native_epoll"] = "mvn:io.netty:netty-transport-native-epoll:jar:4.1.27.Final"
diff --git a/tools/package/features/BUILD b/tools/package/features/BUILD
index 3a99120..7d31d25 100644
--- a/tools/package/features/BUILD
+++ b/tools/package/features/BUILD
@@ -20,10 +20,9 @@
         "@io_netty_netty//jar",
         "@io_netty_netty_common//jar",
         "@io_netty_netty_buffer//jar",
-        "@io_netty_netty_handler//jar",
-        "@io_netty_netty_tcnative_boringssl//jar",
-        "@io_netty_netty_codec//jar",
         "@io_netty_netty_transport//jar",
+        "@io_netty_netty_handler//jar",
+        "@io_netty_netty_codec//jar",
         "@io_netty_netty_transport_native_epoll//jar",
         "@io_netty_netty_transport_native_unix_common//jar",
         "@io_netty_netty_resolver//jar",