Revert "Revert "Add fake ALTS handshaker server (bazel only)""

4 files changed, 579 insertions, 0 deletions

diff --git a/test/core/tsi/alts/fake_handshaker/BUILD b/test/core/tsi/alts/fake_handshaker/BUILD
new file mode 100644
index 0000000000..90e0d00209
--- /dev/null
+++ b/test/core/tsi/alts/fake_handshaker/BUILD
@@ -0,0 +1,47 @@
+# Copyright 2018 gRPC authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+licenses(["notice"])  # Apache v2
+
+load("//bazel:grpc_build_system.bzl", "grpc_proto_library", "grpc_cc_binary", "grpc_package")
+
+grpc_package(name = "test/core/tsi/alts/fake_handshaker", visibility = "public")
+
+grpc_proto_library(
+    name = "transport_security_common_proto",
+    srcs = ["transport_security_common.proto"],
+    has_services = False,
+)
+
+grpc_proto_library(
+    name = "handshaker_proto",
+    srcs = ["handshaker.proto"],
+    has_services = True,
+    deps = [
+        ":transport_security_common_proto",
+    ],
+)
+
+grpc_cc_binary(
+    name = "fake_handshaker_server",
+    testonly = True,
+    srcs = ["fake_handshaker_server.cc"],
+    language = "C++",
+    deps = [
+        ":handshaker_proto",
+        ":transport_security_common_proto",
+        "//:grpc++",
+        "//test/cpp/util:test_config",
+    ],
+)
diff --git a/test/core/tsi/alts/fake_handshaker/fake_handshaker_server.cc b/test/core/tsi/alts/fake_handshaker/fake_handshaker_server.cc
new file mode 100644
index 0000000000..ca24ea4fb3
--- /dev/null
+++ b/test/core/tsi/alts/fake_handshaker/fake_handshaker_server.cc
@@ -0,0 +1,268 @@
+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#include <memory>
+#include <sstream>
+#include <string>
+
+#include <gflags/gflags.h>
+#include <grpc/grpc.h>
+#include <grpc/support/log.h>
+#include <grpcpp/impl/codegen/async_stream.h>
+#include <grpcpp/security/server_credentials.h>
+#include <grpcpp/server.h>
+#include <grpcpp/server_builder.h>
+#include <grpcpp/server_context.h>
+
+#include "test/core/tsi/alts/fake_handshaker/handshaker.grpc.pb.h"
+#include "test/core/tsi/alts/fake_handshaker/handshaker.pb.h"
+#include "test/core/tsi/alts/fake_handshaker/transport_security_common.pb.h"
+#include "test/cpp/util/test_config.h"
+
+DEFINE_int32(handshaker_port, 55056,
+             "TCP port on which the fake handshaker server listens to.");
+
+// Fake handshake messages.
+constexpr char kClientInitFrame[] = "ClientInit";
+constexpr char kServerFrame[] = "ServerInitAndFinished";
+constexpr char kClientFinishFrame[] = "ClientFinished";
+// Error messages.
+constexpr char kInvalidFrameError[] = "Invalid input frame.";
+constexpr char kWrongStateError[] = "Wrong handshake state.";
+
+namespace grpc {
+namespace gcp {
+
+// FakeHandshakeService implements a fake handshaker service using a fake key
+// exchange protocol. The fake key exchange protocol is a 3-message protocol:
+// - Client first sends ClientInit message to Server.
+// - Server then sends ServerInitAndFinished message back to Client.
+// - Client finally sends ClientFinished message to Server.
+// This fake handshaker service is intended for ALTS integration testing without
+// relying on real ALTS handshaker service inside GCE.
+// It is thread-safe.
+class FakeHandshakerService : public HandshakerService::Service {
+ public:
+  Status DoHandshake(
+      ServerContext* server_context,
+      ServerReaderWriter<HandshakerResp, HandshakerReq>* stream) override {
+    Status status;
+    HandshakerContext context;
+    HandshakerReq request;
+    HandshakerResp response;
+    gpr_log(GPR_DEBUG, "Start a new handshake.");
+    while (stream->Read(&request)) {
+      status = ProcessRequest(&context, request, &response);
+      if (!status.ok()) return WriteErrorResponse(stream, status);
+      stream->Write(response);
+      if (context.state == COMPLETED) return Status::OK;
+      request.Clear();
+    }
+    return Status::OK;
+  }
+
+ private:
+  // HandshakeState is used by fake handshaker server to keep track of client's
+  // handshake status. In the beginning of a handshake, the state is INITIAL.
+  // If start_client or start_server request is called, the state becomes at
+  // least STARTED. When the handshaker server produces the first fame, the
+  // state becomes SENT. After the handshaker server processes the final frame
+  // from the peer, the state becomes COMPLETED.
+  enum HandshakeState { INITIAL, STARTED, SENT, COMPLETED };
+
+  struct HandshakerContext {
+    bool is_client = true;
+    HandshakeState state = INITIAL;
+  };
+
+  Status ProcessRequest(HandshakerContext* context,
+                        const HandshakerReq& request,
+                        HandshakerResp* response) {
+    GPR_ASSERT(context != nullptr && response != nullptr);
+    response->Clear();
+    if (request.has_client_start()) {
+      gpr_log(GPR_DEBUG, "Process client start request.");
+      return ProcessClientStart(context, request.client_start(), response);
+    } else if (request.has_server_start()) {
+      gpr_log(GPR_DEBUG, "Process server start request.");
+      return ProcessServerStart(context, request.server_start(), response);
+    } else if (request.has_next()) {
+      gpr_log(GPR_DEBUG, "Process next request.");
+      return ProcessNext(context, request.next(), response);
+    }
+    return Status(StatusCode::INVALID_ARGUMENT, "Request is empty.");
+  }
+
+  Status ProcessClientStart(HandshakerContext* context,
+                            const StartClientHandshakeReq& request,
+                            HandshakerResp* response) {
+    GPR_ASSERT(context != nullptr && response != nullptr);
+    // Checks request.
+    if (context->state != INITIAL) {
+      return Status(StatusCode::FAILED_PRECONDITION, kWrongStateError);
+    }
+    if (request.application_protocols_size() == 0) {
+      return Status(StatusCode::INVALID_ARGUMENT,
+                    "At least one application protocol needed.");
+    }
+    if (request.record_protocols_size() == 0) {
+      return Status(StatusCode::INVALID_ARGUMENT,
+                    "At least one record protocol needed.");
+    }
+    // Sets response.
+    response->set_out_frames(kClientInitFrame);
+    response->set_bytes_consumed(0);
+    response->mutable_status()->set_code(StatusCode::OK);
+    // Updates handshaker context.
+    context->is_client = true;
+    context->state = SENT;
+    return Status::OK;
+  }
+
+  Status ProcessServerStart(HandshakerContext* context,
+                            const StartServerHandshakeReq& request,
+                            HandshakerResp* response) {
+    GPR_ASSERT(context != nullptr && response != nullptr);
+    // Checks request.
+    if (context->state != INITIAL) {
+      return Status(StatusCode::FAILED_PRECONDITION, kWrongStateError);
+    }
+    if (request.application_protocols_size() == 0) {
+      return Status(StatusCode::INVALID_ARGUMENT,
+                    "At least one application protocol needed.");
+    }
+    if (request.handshake_parameters().size() == 0) {
+      return Status(StatusCode::INVALID_ARGUMENT,
+                    "At least one set of handshake parameters needed.");
+    }
+    // Sets response.
+    if (request.in_bytes().empty()) {
+      // start_server request does not have in_bytes.
+      response->set_bytes_consumed(0);
+      context->state = STARTED;
+    } else {
+      // start_server request has in_bytes.
+      if (request.in_bytes() == kClientInitFrame) {
+        response->set_out_frames(kServerFrame);
+        response->set_bytes_consumed(strlen(kClientInitFrame));
+        context->state = SENT;
+      } else {
+        return Status(StatusCode::UNKNOWN, kInvalidFrameError);
+      }
+    }
+    response->mutable_status()->set_code(StatusCode::OK);
+    context->is_client = false;
+    return Status::OK;
+  }
+
+  Status ProcessNext(HandshakerContext* context,
+                     const NextHandshakeMessageReq& request,
+                     HandshakerResp* response) {
+    GPR_ASSERT(context != nullptr && response != nullptr);
+    if (context->is_client) {
+      // Processes next request on client side.
+      if (context->state != SENT) {
+        return Status(StatusCode::FAILED_PRECONDITION, kWrongStateError);
+      }
+      if (request.in_bytes() != kServerFrame) {
+        return Status(StatusCode::UNKNOWN, kInvalidFrameError);
+      }
+      response->set_out_frames(kClientFinishFrame);
+      response->set_bytes_consumed(strlen(kServerFrame));
+      context->state = COMPLETED;
+    } else {
+      // Processes next request on server side.
+      HandshakeState current_state = context->state;
+      if (current_state == STARTED) {
+        if (request.in_bytes() != kClientInitFrame) {
+          return Status(StatusCode::UNKNOWN, kInvalidFrameError);
+        }
+        response->set_out_frames(kServerFrame);
+        response->set_bytes_consumed(strlen(kClientInitFrame));
+        context->state = SENT;
+      } else if (current_state == SENT) {
+        // Client finish frame may be sent along with the first payload from the
+        // client, handshaker only consumes the client finish frame.
+        if (request.in_bytes().substr(0, strlen(kClientFinishFrame)) !=
+            kClientFinishFrame) {
+          return Status(StatusCode::UNKNOWN, kInvalidFrameError);
+        }
+        response->set_bytes_consumed(strlen(kClientFinishFrame));
+        context->state = COMPLETED;
+      } else {
+        return Status(StatusCode::FAILED_PRECONDITION, kWrongStateError);
+      }
+    }
+    // At this point, processing next request succeeded.
+    response->mutable_status()->set_code(StatusCode::OK);
+    if (context->state == COMPLETED) {
+      *response->mutable_result() = GetHandshakerResult();
+    }
+    return Status::OK;
+  }
+
+  Status WriteErrorResponse(
+      ServerReaderWriter<HandshakerResp, HandshakerReq>* stream,
+      const Status& status) {
+    GPR_ASSERT(!status.ok());
+    HandshakerResp response;
+    response.mutable_status()->set_code(status.error_code());
+    response.mutable_status()->set_details(status.error_message());
+    stream->Write(response);
+    return status;
+  }
+
+  HandshakerResult GetHandshakerResult() {
+    HandshakerResult result;
+    result.set_application_protocol("grpc");
+    result.set_record_protocol("ALTSRP_GCM_AES128_REKEY");
+    result.mutable_peer_identity()->set_service_account("peer_identity");
+    result.mutable_local_identity()->set_service_account("local_identity");
+    string key(1024, '\0');
+    result.set_key_data(key);
+    result.mutable_peer_rpc_versions()->mutable_max_rpc_version()->set_major(2);
+    result.mutable_peer_rpc_versions()->mutable_max_rpc_version()->set_minor(1);
+    result.mutable_peer_rpc_versions()->mutable_min_rpc_version()->set_major(2);
+    result.mutable_peer_rpc_versions()->mutable_min_rpc_version()->set_minor(1);
+    return result;
+  }
+};
+
+}  // namespace gcp
+}  // namespace grpc
+
+void RunServer() {
+  GPR_ASSERT(FLAGS_handshaker_port != 0);
+  std::ostringstream server_address;
+  server_address << "[::1]:" << FLAGS_handshaker_port;
+  grpc::gcp::FakeHandshakerService service;
+  grpc::ServerBuilder builder;
+  builder.AddListeningPort(server_address.str(),
+                           grpc::InsecureServerCredentials());
+  builder.RegisterService(&service);
+  std::unique_ptr<grpc::Server> server(builder.BuildAndStart());
+  gpr_log(GPR_INFO, "Fake handshaker server listening on %s",
+          server_address.str().c_str());
+  server->Wait();
+}
+
+int main(int argc, char** argv) {
+  grpc::testing::InitTest(&argc, &argv, true);
+  RunServer();
+  return 0;
+}
diff --git a/test/core/tsi/alts/fake_handshaker/handshaker.proto b/test/core/tsi/alts/fake_handshaker/handshaker.proto
new file mode 100644
index 0000000000..8af9abfbf5
--- /dev/null
+++ b/test/core/tsi/alts/fake_handshaker/handshaker.proto
@@ -0,0 +1,224 @@
+// Copyright 2018 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+import "test/core/tsi/alts/fake_handshaker/transport_security_common.proto";
+
+package grpc.gcp;
+
+option java_package = "io.grpc.alts.internal";
+
+enum HandshakeProtocol {
+  // Default value.
+  HANDSHAKE_PROTOCOL_UNSPECIFIED = 0;
+
+  // TLS handshake protocol.
+  TLS = 1;
+
+  // Application Layer Transport Security handshake protocol.
+  ALTS = 2;
+}
+
+enum NetworkProtocol {
+  NETWORK_PROTOCOL_UNSPECIFIED = 0;
+  TCP = 1;
+  UDP = 2;
+}
+
+message Endpoint {
+  // IP address. It should contain an IPv4 or IPv6 string literal, e.g.
+  // "192.168.0.1" or "2001:db8::1".
+  string ip_address = 1;
+
+  // Port number.
+  int32 port = 2;
+
+  // Network protocol (e.g., TCP, UDP) associated with this endpoint.
+  NetworkProtocol protocol = 3;
+}
+
+message Identity {
+  oneof identity_oneof {
+    // Service account of a connection endpoint.
+    string service_account = 1;
+
+    // Hostname of a connection endpoint.
+    string hostname = 2;
+  }
+}
+
+message StartClientHandshakeReq {
+  // Handshake security protocol requested by the client.
+  HandshakeProtocol handshake_security_protocol = 1;
+
+  // The application protocols supported by the client, e.g., "h2" (for http2),
+  // "grpc".
+  repeated string application_protocols = 2;
+
+  // The record protocols supported by the client, e.g.,
+  // "ALTSRP_GCM_AES128".
+  repeated string record_protocols = 3;
+
+  // (Optional) Describes which server identities are acceptable by the client.
+  // If target identities are provided and none of them matches the peer
+  // identity of the server, handshake will fail.
+  repeated Identity target_identities = 4;
+
+  // (Optional) Application may specify a local identity. Otherwise, the
+  // handshaker chooses a default local identity.
+  Identity local_identity = 5;
+
+  // (Optional) Local endpoint information of the connection to the server,
+  // such as local IP address, port number, and network protocol.
+  Endpoint local_endpoint = 6;
+
+  // (Optional) Endpoint information of the remote server, such as IP address,
+  // port number, and network protocol.
+  Endpoint remote_endpoint = 7;
+
+  // (Optional) If target name is provided, a secure naming check is performed
+  // to verify that the peer authenticated identity is indeed authorized to run
+  // the target name.
+  string target_name = 8;
+
+  // (Optional) RPC protocol versions supported by the client.
+  RpcProtocolVersions rpc_versions = 9;
+}
+
+message ServerHandshakeParameters {
+  // The record protocols supported by the server, e.g.,
+  // "ALTSRP_GCM_AES128".
+  repeated string record_protocols = 1;
+
+  // (Optional) A list of local identities supported by the server, if
+  // specified. Otherwise, the handshaker chooses a default local identity.
+  repeated Identity local_identities = 2;
+}
+
+message StartServerHandshakeReq {
+  // The application protocols supported by the server, e.g., "h2" (for http2),
+  // "grpc".
+  repeated string application_protocols = 1;
+
+  // Handshake parameters (record protocols and local identities supported by
+  // the server) mapped by the handshake protocol. Each handshake security
+  // protocol (e.g., TLS or ALTS) has its own set of record protocols and local
+  // identities. Since protobuf does not support enum as key to the map, the key
+  // to handshake_parameters is the integer value of HandshakeProtocol enum.
+  map<int32, ServerHandshakeParameters> handshake_parameters = 2;
+
+  // Bytes in out_frames returned from the peer's HandshakerResp. It is possible
+  // that the peer's out_frames are split into multiple HandshakReq messages.
+  bytes in_bytes = 3;
+
+  // (Optional) Local endpoint information of the connection to the client,
+  // such as local IP address, port number, and network protocol.
+  Endpoint local_endpoint = 4;
+
+  // (Optional) Endpoint information of the remote client, such as IP address,
+  // port number, and network protocol.
+  Endpoint remote_endpoint = 5;
+
+  // (Optional) RPC protocol versions supported by the server.
+  RpcProtocolVersions rpc_versions = 6;
+}
+
+message NextHandshakeMessageReq {
+  // Bytes in out_frames returned from the peer's HandshakerResp. It is possible
+  // that the peer's out_frames are split into multiple NextHandshakerMessageReq
+  // messages.
+  bytes in_bytes = 1;
+}
+
+message HandshakerReq {
+  oneof req_oneof {
+    // The start client handshake request message.
+    StartClientHandshakeReq client_start = 1;
+
+    // The start server handshake request message.
+    StartServerHandshakeReq server_start = 2;
+
+    // The next handshake request message.
+    NextHandshakeMessageReq next = 3;
+  }
+}
+
+message HandshakerResult {
+  // The application protocol negotiated for this connection.
+  string application_protocol = 1;
+
+  // The record protocol negotiated for this connection.
+  string record_protocol = 2;
+
+  // Cryptographic key data. The key data may be more than the key length
+  // required for the record protocol, thus the client of the handshaker
+  // service needs to truncate the key data into the right key length.
+  bytes key_data = 3;
+
+  // The authenticated identity of the peer.
+  Identity peer_identity = 4;
+
+  // The local identity used in the handshake.
+  Identity local_identity = 5;
+
+  // Indicate whether the handshaker service client should keep the channel
+  // between the handshaker service open, e.g., in order to handle
+  // post-handshake messages in the future.
+  bool keep_channel_open = 6;
+
+  // The RPC protocol versions supported by the peer.
+  RpcProtocolVersions peer_rpc_versions = 7;
+}
+
+message HandshakerStatus {
+  // The status code. This could be the gRPC status code.
+  uint32 code = 1;
+
+  // The status details.
+  string details = 2;
+}
+
+message HandshakerResp {
+  // Frames to be given to the peer for the NextHandshakeMessageReq. May be
+  // empty if no out_frames have to be sent to the peer or if in_bytes in the
+  // HandshakerReq are incomplete. All the non-empty out frames must be sent to
+  // the peer even if the handshaker status is not OK as these frames may
+  // contain the alert frames.
+  bytes out_frames = 1;
+
+  // Number of bytes in the in_bytes consumed by the handshaker. It is possible
+  // that part of in_bytes in HandshakerReq was unrelated to the handshake
+  // process.
+  uint32 bytes_consumed = 2;
+
+  // This is set iff the handshake was successful. out_frames may still be set
+  // to frames that needs to be forwarded to the peer.
+  HandshakerResult result = 3;
+
+  // Status of the handshaker.
+  HandshakerStatus status = 4;
+}
+
+service HandshakerService {
+  // Handshaker service accepts a stream of handshaker request, returning a
+  // stream of handshaker response. Client is expected to send exactly one
+  // message with either client_start or server_start followed by one or more
+  // messages with next. Each time client sends a request, the handshaker
+  // service expects to respond. Client does not have to wait for service's
+  // response before sending next request.
+  rpc DoHandshake(stream HandshakerReq)
+      returns (stream HandshakerResp) {
+  }
+}
diff --git a/test/core/tsi/alts/fake_handshaker/transport_security_common.proto b/test/core/tsi/alts/fake_handshaker/transport_security_common.proto
new file mode 100644
index 0000000000..d0f861e644
--- /dev/null
+++ b/test/core/tsi/alts/fake_handshaker/transport_security_common.proto
@@ -0,0 +1,40 @@
+// Copyright 2018 gRPC authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+syntax = "proto3";
+
+package grpc.gcp;
+
+option java_package = "io.grpc.alts.internal";
+
+// The security level of the created channel. The list is sorted in increasing
+// level of security. This order must always be maintained.
+enum SecurityLevel {
+  SECURITY_NONE = 0;
+  INTEGRITY_ONLY = 1;
+  INTEGRITY_AND_PRIVACY = 2;
+}
+
+// Max and min supported RPC protocol versions.
+message RpcProtocolVersions {
+  // RPC version contains a major version and a minor version.
+  message Version {
+    uint32 major = 1;
+    uint32 minor = 2;
+  }
+  // Maximum supported RPC version.
+  Version max_rpc_version = 1;
+  // Minimum supported RPC version.
+  Version min_rpc_version = 2;
+}