[PECO-1857] Use SSL options with HTTPS connection pool (#425)

* [PECO-1857] Use SSL options with HTTPS connection pool

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Some cleanup

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Resolve circular dependencies

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Update existing tests

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Fix MyPy issues

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Fix `_tls_no_verify` handling

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

* Add tests

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

---------

Signed-off-by: Levko Kravets <levko.ne@gmail.com>

src/databricks/sql/auth/thrift_http_client.py

@@ -1,13 +1,11 @@
 import base64
 import logging
 import urllib.parse
-from typing import Dict, Union
+from typing import Dict, Union, Optional
 
 import six
 import thrift
 
-logger = logging.getLogger(__name__)
-
 import ssl
 import warnings
 from http.client import HTTPResponse
@@ -16,6 +14,9 @@
 from urllib3 import HTTPConnectionPool, HTTPSConnectionPool, ProxyManager
 from urllib3.util import make_headers
 from databricks.sql.auth.retry import CommandType, DatabricksRetryPolicy
+from databricks.sql.types import SSLOptions
+
+logger = logging.getLogger(__name__)
 
 
 class THttpClient(thrift.transport.THttpClient.THttpClient):
@@ -25,13 +26,12 @@ def __init__(
         uri_or_host,
         port=None,
         path=None,
-        cafile=None,
-        cert_file=None,
-        key_file=None,
-        ssl_context=None,
+        ssl_options: Optional[SSLOptions] = None,
         max_connections: int = 1,
         retry_policy: Union[DatabricksRetryPolicy, int] = 0,
     ):
+        self._ssl_options = ssl_options
+
         if port is not None:
             warnings.warn(
                 "Please use the THttpClient('http{s}://host:port/path') constructor",
@@ -48,13 +48,11 @@ def __init__(
             self.scheme = parsed.scheme
             assert self.scheme in ("http", "https")
             if self.scheme == "https":
-                self.certfile = cert_file
-                self.keyfile = key_file
-                self.context = (
-                    ssl.create_default_context(cafile=cafile)
-                    if (cafile and not ssl_context)
-                    else ssl_context
-                )
+                if self._ssl_options is not None:
+                    # TODO: Not sure if those options are used anywhere - need to double-check
+                    self.certfile = self._ssl_options.tls_client_cert_file
+                    self.keyfile = self._ssl_options.tls_client_cert_key_file
+                    self.context = self._ssl_options.create_ssl_context()
             self.port = parsed.port
             self.host = parsed.hostname
             self.path = parsed.path
@@ -109,12 +107,23 @@ def startRetryTimer(self):
     def open(self):
 
         # self.__pool replaces the self.__http used by the original THttpClient
+        _pool_kwargs = {"maxsize": self.max_connections}
+
         if self.scheme == "http":
             pool_class = HTTPConnectionPool
         elif self.scheme == "https":
             pool_class = HTTPSConnectionPool
-
-        _pool_kwargs = {"maxsize": self.max_connections}
+            _pool_kwargs.update(
+                {
+                    "cert_reqs": ssl.CERT_REQUIRED
+                    if self._ssl_options.tls_verify
+                    else ssl.CERT_NONE,
+                    "ca_certs": self._ssl_options.tls_trusted_ca_file,
+                    "cert_file": self._ssl_options.tls_client_cert_file,
+                    "key_file": self._ssl_options.tls_client_cert_key_file,
+                    "key_password": self._ssl_options.tls_client_cert_key_password,
+                }
+            )
 
         if self.using_proxy():
             proxy_manager = ProxyManager(

src/databricks/sql/client.py

@@ -35,7 +35,7 @@
 )
 
 
-from databricks.sql.types import Row
+from databricks.sql.types import Row, SSLOptions
 from databricks.sql.auth.auth import get_python_sql_connector_auth_provider
 from databricks.sql.experimental.oauth_persistence import OAuthPersistence
 
@@ -178,8 +178,9 @@ def read(self) -> Optional[OAuthToken]:
         # _tls_trusted_ca_file
         #   Set to the path of the file containing trusted CA certificates for server certificate
         #   verification. If not provide, uses system truststore.
-        # _tls_client_cert_file, _tls_client_cert_key_file
+        # _tls_client_cert_file, _tls_client_cert_key_file, _tls_client_cert_key_password
         #   Set client SSL certificate.
+        #   See https://docs.python.org/3/library/ssl.html#ssl.SSLContext.load_cert_chain
         # _retry_stop_after_attempts_count
         #  The maximum number of attempts during a request retry sequence (defaults to 24)
         # _socket_timeout
@@ -220,12 +221,25 @@ def read(self) -> Optional[OAuthToken]:
 
         base_headers = [("User-Agent", useragent_header)]
 
+        self._ssl_options = SSLOptions(
+            # Double negation is generally a bad thing, but we have to keep backward compatibility
+            tls_verify=not kwargs.get(
+                "_tls_no_verify", False
+            ),  # by default - verify cert and host
+            tls_verify_hostname=kwargs.get("_tls_verify_hostname", True),
+            tls_trusted_ca_file=kwargs.get("_tls_trusted_ca_file"),
+            tls_client_cert_file=kwargs.get("_tls_client_cert_file"),
+            tls_client_cert_key_file=kwargs.get("_tls_client_cert_key_file"),
+            tls_client_cert_key_password=kwargs.get("_tls_client_cert_key_password"),
+        )
+
         self.thrift_backend = ThriftBackend(
             self.host,
             self.port,
             http_path,
             (http_headers or []) + base_headers,
             auth_provider,
+            ssl_options=self._ssl_options,
             _use_arrow_native_complex_types=_use_arrow_native_complex_types,
             **kwargs,
         )

src/databricks/sql/cloudfetch/download_manager.py

@@ -1,6 +1,5 @@
 import logging
 
-from ssl import SSLContext
 from concurrent.futures import ThreadPoolExecutor, Future
 from typing import List, Union
 
@@ -9,6 +8,8 @@
     DownloadableResultSettings,
     DownloadedFile,
 )
+from databricks.sql.types import SSLOptions
+
 from databricks.sql.thrift_api.TCLIService.ttypes import TSparkArrowResultLink
 
 logger = logging.getLogger(__name__)
@@ -20,7 +21,7 @@ def __init__(
         links: List[TSparkArrowResultLink],
         max_download_threads: int,
         lz4_compressed: bool,
-        ssl_context: SSLContext,
+        ssl_options: SSLOptions,
     ):
         self._pending_links: List[TSparkArrowResultLink] = []
         for link in links:
@@ -38,7 +39,7 @@ def __init__(
         self._thread_pool = ThreadPoolExecutor(max_workers=self._max_download_threads)
 
         self._downloadable_result_settings = DownloadableResultSettings(lz4_compressed)
-        self._ssl_context = ssl_context
+        self._ssl_options = ssl_options
 
     def get_next_downloaded_file(
         self, next_row_offset: int
@@ -95,7 +96,7 @@ def _schedule_downloads(self):
             handler = ResultSetDownloadHandler(
                 settings=self._downloadable_result_settings,
                 link=link,
-                ssl_context=self._ssl_context,
+                ssl_options=self._ssl_options,
             )
             task = self._thread_pool.submit(handler.run)
             self._download_tasks.append(task)

src/databricks/sql/cloudfetch/downloader.py

@@ -3,13 +3,12 @@
 
 import requests
 from requests.adapters import HTTPAdapter, Retry
-from ssl import SSLContext, CERT_NONE
 import lz4.frame
 import time
 
 from databricks.sql.thrift_api.TCLIService.ttypes import TSparkArrowResultLink
-
 from databricks.sql.exc import Error
+from databricks.sql.types import SSLOptions
 
 logger = logging.getLogger(__name__)
 
@@ -66,11 +65,11 @@ def __init__(
         self,
         settings: DownloadableResultSettings,
         link: TSparkArrowResultLink,
-        ssl_context: SSLContext,
+        ssl_options: SSLOptions,
     ):
         self.settings = settings
         self.link = link
-        self._ssl_context = ssl_context
+        self._ssl_options = ssl_options
 
     def run(self) -> DownloadedFile:
         """
@@ -95,14 +94,13 @@ def run(self) -> DownloadedFile:
         session.mount("http://", HTTPAdapter(max_retries=retryPolicy))
         session.mount("https://", HTTPAdapter(max_retries=retryPolicy))
 
-        ssl_verify = self._ssl_context.verify_mode != CERT_NONE
-
         try:
             # Get the file via HTTP request
             response = session.get(
                 self.link.fileLink,
                 timeout=self.settings.download_timeout,
-                verify=ssl_verify,
+                verify=self._ssl_options.tls_verify,
+                # TODO: Pass cert from `self._ssl_options`
             )
             response.raise_for_status()
 

src/databricks/sql/thrift_backend.py

@@ -5,7 +5,6 @@
 import time
 import uuid
 import threading
-from ssl import CERT_NONE, CERT_REQUIRED, create_default_context
 from typing import List, Union
 
 import pyarrow
@@ -36,6 +35,7 @@
     convert_decimals_in_arrow_table,
     convert_column_based_set_to_arrow_table,
 )
+from databricks.sql.types import SSLOptions
 
 logger = logging.getLogger(__name__)
 
@@ -85,6 +85,7 @@ def __init__(
         http_path: str,
         http_headers,
         auth_provider: AuthProvider,
+        ssl_options: SSLOptions,
         staging_allowed_local_path: Union[None, str, List[str]] = None,
         **kwargs,
     ):
@@ -93,16 +94,6 @@ def __init__(
         #   Tag to add to User-Agent header. For use by partners.
         # _username, _password
         #   Username and password Basic authentication (no official support)
-        # _tls_no_verify
-        #   Set to True (Boolean) to completely disable SSL verification.
-        # _tls_verify_hostname
-        #   Set to False (Boolean) to disable SSL hostname verification, but check certificate.
-        # _tls_trusted_ca_file
-        #   Set to the path of the file containing trusted CA certificates for server certificate
-        #   verification. If not provide, uses system truststore.
-        # _tls_client_cert_file, _tls_client_cert_key_file, _tls_client_cert_key_password
-        #   Set client SSL certificate.
-        #   See https://docs.python.org/3/library/ssl.html#ssl.SSLContext.load_cert_chain
         # _connection_uri
         #   Overrides server_hostname and http_path.
         # RETRY/ATTEMPT POLICY
@@ -162,29 +153,7 @@ def __init__(
         # Cloud fetch
         self.max_download_threads = kwargs.get("max_download_threads", 10)
 
-        # Configure tls context
-        ssl_context = create_default_context(cafile=kwargs.get("_tls_trusted_ca_file"))
-        if kwargs.get("_tls_no_verify") is True:
-            ssl_context.check_hostname = False
-            ssl_context.verify_mode = CERT_NONE
-        elif kwargs.get("_tls_verify_hostname") is False:
-            ssl_context.check_hostname = False
-            ssl_context.verify_mode = CERT_REQUIRED
-        else:
-            ssl_context.check_hostname = True
-            ssl_context.verify_mode = CERT_REQUIRED
-
-        tls_client_cert_file = kwargs.get("_tls_client_cert_file")
-        tls_client_cert_key_file = kwargs.get("_tls_client_cert_key_file")
-        tls_client_cert_key_password = kwargs.get("_tls_client_cert_key_password")
-        if tls_client_cert_file:
-            ssl_context.load_cert_chain(
-                certfile=tls_client_cert_file,
-                keyfile=tls_client_cert_key_file,
-                password=tls_client_cert_key_password,
-            )
-
-        self._ssl_context = ssl_context
+        self._ssl_options = ssl_options
 
         self._auth_provider = auth_provider
 
@@ -225,7 +194,7 @@ def __init__(
         self._transport = databricks.sql.auth.thrift_http_client.THttpClient(
             auth_provider=self._auth_provider,
             uri_or_host=uri,
-            ssl_context=self._ssl_context,
+            ssl_options=self._ssl_options,
             **additional_transport_args,  # type: ignore
         )
 
@@ -776,7 +745,7 @@ def _results_message_to_execute_response(self, resp, operation_state):
                 max_download_threads=self.max_download_threads,
                 lz4_compressed=lz4_compressed,
                 description=description,
-                ssl_context=self._ssl_context,
+                ssl_options=self._ssl_options,
             )
         else:
             arrow_queue_opt = None
@@ -1008,7 +977,7 @@ def fetch_results(
             max_download_threads=self.max_download_threads,
             lz4_compressed=lz4_compressed,
             description=description,
-            ssl_context=self._ssl_context,
+            ssl_options=self._ssl_options,
         )
 
         return queue, resp.hasMoreRows

src/databricks/sql/types.py

@@ -19,6 +19,54 @@
 from typing import Any, Dict, List, Optional, Tuple, Union, TypeVar
 import datetime
 import decimal
+from ssl import SSLContext, CERT_NONE, CERT_REQUIRED, create_default_context
+
+
+class SSLOptions:
+    tls_verify: bool
+    tls_verify_hostname: bool
+    tls_trusted_ca_file: Optional[str]
+    tls_client_cert_file: Optional[str]
+    tls_client_cert_key_file: Optional[str]
+    tls_client_cert_key_password: Optional[str]
+
+    def __init__(
+        self,
+        tls_verify: bool = True,
+        tls_verify_hostname: bool = True,
+        tls_trusted_ca_file: Optional[str] = None,
+        tls_client_cert_file: Optional[str] = None,
+        tls_client_cert_key_file: Optional[str] = None,
+        tls_client_cert_key_password: Optional[str] = None,
+    ):
+        self.tls_verify = tls_verify
+        self.tls_verify_hostname = tls_verify_hostname
+        self.tls_trusted_ca_file = tls_trusted_ca_file
+        self.tls_client_cert_file = tls_client_cert_file
+        self.tls_client_cert_key_file = tls_client_cert_key_file
+        self.tls_client_cert_key_password = tls_client_cert_key_password
+
+    def create_ssl_context(self) -> SSLContext:
+        ssl_context = create_default_context(cafile=self.tls_trusted_ca_file)
+
+        if self.tls_verify is False:
+            ssl_context.check_hostname = False
+            ssl_context.verify_mode = CERT_NONE
+        elif self.tls_verify_hostname is False:
+            ssl_context.check_hostname = False
+            ssl_context.verify_mode = CERT_REQUIRED
+        else:
+            ssl_context.check_hostname = True
+            ssl_context.verify_mode = CERT_REQUIRED
+
+        if self.tls_client_cert_file:
+            ssl_context.load_cert_chain(
+                certfile=self.tls_client_cert_file,
+                keyfile=self.tls_client_cert_key_file,
+                password=self.tls_client_cert_key_password,
+            )
+
+        return ssl_context
 
 
 class Row(tuple):