Python PSM Security Interop Client+Server (#25991)

* Add channelz to security client

* Make client changes. Some config needs to be reverted

* Add missing security field to channelz Socket

* Add test

* Fix test

* Remove whitespaces for windows

* Remove local_certificate check from PSM security tests

* Byte pack Python channelz IPs

* Move address packing to Core

* WIP

* Unbork security tests

* Python interop server

* Turn up server logging

* Clean up PR

* Clean up some more

* Yapf

* Fix up docker images

* Swap fillllllles!

* Add more robust boolean arg parsing

* Use bool_arg parsing in server as well

* Add copyright

Co-authored-by: Yash Tibrewal <yashkt@google.com>

src/python/grpcio_tests/tests_py3_only/interop/BUILD.bazel

@@ -8,5 +8,22 @@ py_binary(
         "//src/proto/grpc/testing:py_test_proto",
         "//src/proto/grpc/testing:test_py_pb2_grpc",
         "//src/python/grpcio/grpc:grpcio",
+        "//src/python/grpcio_channelz/grpc_channelz/v1:grpc_channelz",
+    ],
+)
+
+py_binary(
+    name = "xds_interop_server",
+    srcs = ["xds_interop_server.py"],
+    python_version = "PY3",
+    deps = [
+        "//src/proto/grpc/testing:empty_py_pb2",
+        "//src/proto/grpc/testing:py_messages_proto",
+        "//src/proto/grpc/testing:py_test_proto",
+        "//src/proto/grpc/testing:test_py_pb2_grpc",
+        "//src/python/grpcio/grpc:grpcio",
+        "//src/python/grpcio_channelz/grpc_channelz/v1:grpc_channelz",
+        "//src/python/grpcio_health_checking/grpc_health/v1:grpc_health",
+        "//src/python/grpcio_reflection/grpc_reflection/v1alpha:grpc_reflection",
     ],
 )

src/python/grpcio_tests/tests_py3_only/interop/Dockerfile.client

@@ -0,0 +1,25 @@
+FROM phusion/baseimage:master@sha256:65ea10d5f757e5e86272625f8675d437dd83d8db64bdb429e2354d58f5462750
+
+RUN apt-get update -y && \
+        apt-get install -y \
+            build-essential \
+            clang \
+            python3 \
+            python3-dev
+
+WORKDIR /workdir
+
+RUN ln -s /usr/bin/python3 /usr/bin/python
+RUN mkdir /artifacts
+
+COPY . .
+RUN tools/bazel build -c dbg //src/python/grpcio_tests/tests_py3_only/interop:xds_interop_client
+RUN cp -rL /workdir/bazel-bin/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client* /artifacts/
+
+FROM phusion/baseimage:master@sha256:65ea10d5f757e5e86272625f8675d437dd83d8db64bdb429e2354d58f5462750
+COPY --from=0 /artifacts ./
+
+RUN apt-get update -y && apt-get install -y python3
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
+ENTRYPOINT ["/xds_interop_client"]

src/python/grpcio_tests/tests_py3_only/interop/Dockerfile.server

@@ -0,0 +1,25 @@
+FROM phusion/baseimage:master@sha256:65ea10d5f757e5e86272625f8675d437dd83d8db64bdb429e2354d58f5462750
+
+RUN apt-get update -y && \
+        apt-get install -y \
+            build-essential \
+            clang \
+            python3 \
+            python3-dev
+
+WORKDIR /workdir
+
+RUN ln -s /usr/bin/python3 /usr/bin/python
+RUN mkdir /artifacts
+
+COPY . .
+RUN tools/bazel build -c dbg //src/python/grpcio_tests/tests_py3_only/interop:xds_interop_server
+RUN cp -rL /workdir/bazel-bin/src/python/grpcio_tests/tests_py3_only/interop/xds_interop_server* /artifacts/
+
+FROM phusion/baseimage:master@sha256:65ea10d5f757e5e86272625f8675d437dd83d8db64bdb429e2354d58f5462750
+COPY --from=0 /artifacts ./
+
+RUN apt-get update -y && apt-get install -y python3
+RUN ln -s /usr/bin/python3 /usr/bin/python
+
+ENTRYPOINT ["/xds_interop_server"]

src/python/grpcio_tests/tests_py3_only/interop/build_client_image.sh

@@ -0,0 +1,28 @@
+# Copyright 2021 The 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.
+#!/bin/bash
+
+set -x
+
+VERSION=$(git rev-parse HEAD)
+
+PROJECT=grpc-testing
+TAG=gcr.io/${PROJECT}/python_xds_interop_client:$VERSION
+
+cd "$(dirname "${BASH_SOURCE[0]}")/../../../../.."
+
+docker build \
+    -t ${TAG} \
+    -f src/python/grpcio_tests/tests_py3_only/interop/Dockerfile.client \
+    .

src/python/grpcio_tests/tests_py3_only/interop/build_server_image.sh

@@ -0,0 +1,28 @@
+# Copyright 2021 The 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.
+#!/bin/bash
+
+set -x
+
+VERSION=$(git rev-parse HEAD)
+
+PROJECT=grpc-testing
+TAG=gcr.io/${PROJECT}/python_xds_interop_server:$VERSION
+
+cd "$(dirname "${BASH_SOURCE[0]}")/../../../../.."
+
+docker build \
+    -t ${TAG} \
+    -f src/python/grpcio_tests/tests_py3_only/interop/Dockerfile.server \
+    .

src/python/grpcio_tests/tests_py3_only/interop/xds_interop_client.py

@@ -27,6 +27,7 @@ import collections
 from concurrent import futures
 
 import grpc
+from grpc_channelz.v1 import channelz
 
 from src.proto.grpc.testing import test_pb2
 from src.proto.grpc.testing import test_pb2_grpc
@@ -257,9 +258,9 @@ class _ChannelConfiguration:
     When accessing any of its members, the lock member should be held.
     """
 
-    def __init__(self, method: str, metadata: Sequence[Tuple[str,
-                                                             str]], qps: int,
-                 server: str, rpc_timeout_sec: int, print_response: bool):
+    def __init__(self, method: str, metadata: Sequence[Tuple[str, str]],
+                 qps: int, server: str, rpc_timeout_sec: int,
+                 print_response: bool, secure_mode: bool):
         # condition is signalled when a change is made to the config.
         self.condition = threading.Condition()
 
@@ -269,13 +270,21 @@ class _ChannelConfiguration:
         self.server = server
         self.rpc_timeout_sec = rpc_timeout_sec
         self.print_response = print_response
+        self.secure_mode = secure_mode
 
 
 def _run_single_channel(config: _ChannelConfiguration) -> None:
     global _global_rpc_id  # pylint: disable=global-statement
     with config.condition:
         server = config.server
-    with grpc.insecure_channel(server) as channel:
+    channel = None
+    if config.secure_mode:
+        fallback_creds = grpc.experimental.insecure_channel_credentials()
+        channel_creds = grpc.xds_channel_credentials(fallback_creds)
+        channel = grpc.secure_channel(server, channel_creds)
+    else:
+        channel = grpc.insecure_channel(server)
+    with channel:
         stub = test_pb2_grpc.TestServiceStub(channel)
         futures: Dict[int, Tuple[grpc.Future, str]] = {}
         while not _stop_event.is_set():
@@ -382,7 +391,7 @@ def _run(args: argparse.Namespace, methods: Sequence[str],
             qps = 0
         channel_config = _ChannelConfiguration(
             method, per_method_metadata.get(method, []), qps, args.server,
-            args.rpc_timeout_sec, args.print_response)
+            args.rpc_timeout_sec, args.print_response, args.secure_mode)
         channel_configs[method] = channel_config
         method_handles.append(_MethodHandle(args.num_channels, channel_config))
     _global_server = grpc.server(futures.ThreadPoolExecutor())
@@ -392,6 +401,7 @@ def _run(args: argparse.Namespace, methods: Sequence[str],
     test_pb2_grpc.add_XdsUpdateClientConfigureServiceServicer_to_server(
         _XdsUpdateClientConfigureServicer(channel_configs, args.qps),
         _global_server)
+    channelz.add_channelz_servicer(_global_server)
     _global_server.start()
     _global_server.wait_for_termination()
     for method_handle in method_handles:
@@ -420,6 +430,15 @@ def parse_rpc_arg(rpc_arg: str) -> Sequence[str]:
     return methods
 
 
+def bool_arg(arg: str) -> bool:
+    if arg.lower() in ("true", "yes", "y"):
+        return True
+    elif arg.lower() in ("false", "no", "n"):
+        return False
+    else:
+        raise argparse.ArgumentTypeError(f"Could not parse '{arg}' as a bool.")
+
+
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(
         description='Run Python XDS interop client.')
@@ -429,8 +448,8 @@ if __name__ == "__main__":
         type=int,
         help="The number of channels from which to send requests.")
     parser.add_argument("--print_response",
-                        default=False,
-                        action="store_true",
+                        default="False",
+                        type=bool_arg,
                         help="Write RPC response to STDOUT.")
     parser.add_argument(
         "--qps",
@@ -449,6 +468,11 @@ if __name__ == "__main__":
         default=50052,
         type=int,
         help="The port on which to expose the peer distribution stats service.")
+    parser.add_argument(
+        "--secure_mode",
+        default="False",
+        type=bool_arg,
+        help="If specified, uses xDS credentials to connect to the server.")
     parser.add_argument('--verbose',
                         help='verbose log output',
                         default=False,

src/python/grpcio_tests/tests_py3_only/interop/xds_interop_server.py

@@ -0,0 +1,178 @@
+# Copyright 2021 The 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.
+
+import argparse
+import logging
+import signal
+import threading
+import time
+import socket
+import sys
+
+from typing import DefaultDict, Dict, List, Mapping, Set, Sequence, Tuple
+import collections
+
+from concurrent import futures
+
+import grpc
+from grpc_channelz.v1 import channelz
+from grpc_channelz.v1 import channelz_pb2
+from grpc_health.v1 import health_pb2, health_pb2_grpc
+from grpc_health.v1 import health as grpc_health
+from grpc_reflection.v1alpha import reflection
+
+from src.proto.grpc.testing import test_pb2
+from src.proto.grpc.testing import test_pb2_grpc
+from src.proto.grpc.testing import messages_pb2
+from src.proto.grpc.testing import empty_pb2
+
+# NOTE: This interop server is not fully compatible with all xDS interop tests.
+#  It currently only implements enough functionality to pass the xDS security
+#  tests.
+
+_LISTEN_HOST = "[::]"
+
+_THREAD_POOL_SIZE = 256
+
+logger = logging.getLogger()
+console_handler = logging.StreamHandler()
+formatter = logging.Formatter(fmt='%(asctime)s: %(levelname)-8s %(message)s')
+console_handler.setFormatter(formatter)
+logger.addHandler(console_handler)
+
+
+class TestService(test_pb2_grpc.TestServiceServicer):
+
+    def __init__(self, server_id, hostname):
+        self._server_id = server_id
+        self._hostname = hostname
+
+    def EmptyCall(self, _: empty_pb2.Empty,
+                  context: grpc.ServicerContext) -> empty_pb2.Empty:
+        return empty_pb2.Empty()
+
+    def UnaryCall(self, request: messages_pb2.SimpleRequest,
+                  context: grpc.ServicerContext) -> messages_pb2.SimpleResponse:
+        response = messages_pb2.SimpleResponse()
+        response.server_id = self._server_id
+        response.hostname = self._hostname
+        return response
+
+
+def _configure_maintenance_server(server: grpc.Server,
+                                  maintenance_port: int) -> None:
+    channelz.add_channelz_servicer(server)
+    listen_address = f"{_LISTEN_HOST}:{maintenance_port}"
+    server.add_insecure_port(listen_address)
+    health_servicer = grpc_health.HealthServicer(
+        experimental_non_blocking=True,
+        experimental_thread_pool=futures.ThreadPoolExecutor(
+            max_workers=_THREAD_POOL_SIZE))
+
+    health_pb2_grpc.add_HealthServicer_to_server(health_servicer, server)
+    SERVICE_NAMES = (
+        test_pb2.DESCRIPTOR.services_by_name["TestService"].full_name,
+        health_pb2.DESCRIPTOR.services_by_name["Health"].full_name,
+        channelz_pb2.DESCRIPTOR.services_by_name["Channelz"].full_name,
+        reflection.SERVICE_NAME,
+    )
+    for service in SERVICE_NAMES:
+        health_servicer.set(service, health_pb2.HealthCheckResponse.SERVING)
+    reflection.enable_server_reflection(SERVICE_NAMES, server)
+
+
+def _configure_test_server(server: grpc.Server, port: int, secure_mode: bool,
+                           server_id: str) -> None:
+    test_pb2_grpc.add_TestServiceServicer_to_server(
+        TestService(server_id, socket.gethostname()), server)
+    listen_address = f"{_LISTEN_HOST}:{port}"
+    if not secure_mode:
+        server.add_insecure_port(listen_address)
+    else:
+        logger.info("Running with xDS Server credentials")
+        server_fallback_creds = grpc.insecure_server_credentials()
+        server_creds = grpc.xds_server_credentials(server_fallback_creds)
+        server.add_secure_port(listen_address, server_creds)
+
+
+def _run(port: int, maintenance_port: int, secure_mode: bool,
+         server_id: str) -> None:
+    if port == maintenance_port:
+        server = grpc.server(
+            futures.ThreadPoolExecutor(max_workers=_THREAD_POOL_SIZE))
+        _configure_test_server(server, port, secure_mode, server_id)
+        _configure_maintenance_server(server, maintenance_port)
+        server.start()
+        logger.info("Test server listening on port %d", port)
+        logger.info("Maintenance server listening on port %d", maintenance_port)
+        server.wait_for_termination()
+    else:
+        test_server = grpc.server(
+            futures.ThreadPoolExecutor(max_workers=_THREAD_POOL_SIZE),
+            xds=secure_mode)
+        _configure_test_server(test_server, port, secure_mode, server_id)
+        test_server.start()
+        logger.info("Test server listening on port %d", port)
+        maintenance_server = grpc.server(
+            futures.ThreadPoolExecutor(max_workers=_THREAD_POOL_SIZE))
+        _configure_maintenance_server(maintenance_server, maintenance_port)
+        maintenance_server.start()
+        logger.info("Maintenance server listening on port %d", maintenance_port)
+        test_server.wait_for_termination()
+        maintenance_server.wait_for_termination()
+
+
+def bool_arg(arg: str) -> bool:
+    if arg.lower() in ("true", "yes", "y"):
+        return True
+    elif arg.lower() in ("false", "no", "n"):
+        return False
+    else:
+        raise argparse.ArgumentTypeError(f"Could not parse '{arg}' as a bool.")
+
+
+if __name__ == "__main__":
+    parser = argparse.ArgumentParser(
+        description="Run Python xDS interop server.")
+    parser.add_argument("--port",
+                        type=int,
+                        default=8080,
+                        help="Port for test server.")
+    parser.add_argument("--maintenance_port",
+                        type=int,
+                        default=8080,
+                        help="Port for servers besides test server.")
+    parser.add_argument(
+        "--secure_mode",
+        type=bool_arg,
+        default="False",
+        help="If specified, uses xDS to retrieve server credentials.")
+    parser.add_argument("--server_id",
+                        type=str,
+                        default="python_server",
+                        help="The server ID to return in responses..")
+    parser.add_argument('--verbose',
+                        help='verbose log output',
+                        default=False,
+                        action='store_true')
+    args = parser.parse_args()
+    if args.verbose:
+        logger.setLevel(logging.DEBUG)
+    else:
+        logger.setLevel(logging.INFO)
+    if args.secure_mode and args.port == args.maintenance_port:
+        raise ValueError(
+            "--port and --maintenance_port must not be the same when --secure_mode is set."
+        )
+    _run(args.port, args.maintenance_port, args.secure_mode, args.server_id)