tabpy.tabpy_server.app.app.TabPyApp._initialize_ssl_context() - Code Metrics - tableau/TabPy - Measure and Improve Code Quality continuously with Scrutinizer

TabPyApp._initialize_ssl_context() A
last analyzed 2024-11-25 22:00 UTC

↳ Parent: tabpy.tabpy_server.app.app

Complexity

Conditions

Size

Total Lines	17
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	1
CRAP Score	4.916

Importance

Changes

Metric	Value
eloc	12
dl	0
loc	17
ccs	1
cts	10
cp	0.1
rs	9.8
c	0
b	0
f	0
cc	2
nop	1
crap	4.916

import concurrent.futures
import configparser
import logging
import multiprocessing
import os
import shutil
import signal
import ssl
import sys
import _thread

import tornado
from tornado.http1connection import HTTP1Connection

import tabpy
import tabpy.tabpy_server.app.arrow_server as pa
from tabpy.tabpy import __version__
from tabpy.tabpy_server.app.app_parameters import ConfigParameters, SettingsParameters
from tabpy.tabpy_server.app.util import parse_pwd_file
from tabpy.tabpy_server.handlers.basic_auth_server_middleware_factory import BasicAuthServerMiddlewareFactory
from tabpy.tabpy_server.handlers.no_op_auth_handler import NoOpAuthHandler
from tabpy.tabpy_server.management.state import TabPyState
from tabpy.tabpy_server.management.util import _get_state_from_file
from tabpy.tabpy_server.psws.callbacks import init_model_evaluator, init_ps_server
from tabpy.tabpy_server.psws.python_service import PythonService, PythonServiceHandler
from tabpy.tabpy_server.handlers import (
    EndpointHandler,
    EndpointsHandler,
    EvaluationPlaneHandler,
    EvaluationPlaneDisabledHandler,
    QueryPlaneHandler,
    ServiceInfoHandler,
    StatusHandler,
    UploadDestinationHandler,
)

logger = logging.getLogger(__name__)

def _init_asyncio_patch():
    """
    Select compatible event loop for Tornado 5+.
    As of Python 3.8, the default event loop on Windows is `proactor`,
    however Tornado requires the old default "selector" event loop.
    As Tornado has decided to leave this to users to set, MkDocs needs
    to set it. See https://github.com/tornadoweb/tornado/issues/2608.
    """
    if sys.platform.startswith("win") and sys.version_info >= (3, 8):
        import asyncio
        try:
            from asyncio import WindowsSelectorEventLoopPolicy
        except ImportError:
            pass  # Can't assign a policy which doesn't exist.
        else:
            if not isinstance(asyncio.get_event_loop_policy(), WindowsSelectorEventLoopPolicy):
                asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())


class TabPyApp:
    """
    TabPy application class for keeping context like settings, state, etc.
    """

    settings = {}
    subdirectory = ""
    tabpy_state = None
    python_service = None
    credentials = {}
    arrow_server = None
    max_request_size = None

    def __init__(self, config_file, disable_auth_warning=True):
        self.disable_auth_warning = disable_auth_warning
        if config_file is None:
            config_file = os.path.join(
                os.path.dirname(__file__), os.path.pardir, "common", "default.conf"
            )

        if os.path.isfile(config_file):
            try:
                from logging import config
                config.fileConfig(config_file, disable_existing_loggers=False)
            except KeyError:
                logging.basicConfig(level=logging.DEBUG)

        self._parse_config(config_file)

    def _initialize_ssl_context(self):
        ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)

        ssl_context.load_cert_chain(
            certfile=self.settings[SettingsParameters.CertificateFile],
            keyfile=self.settings[SettingsParameters.KeyFile]
        )

        min_tls = self.settings[SettingsParameters.MinimumTLSVersion]
        if not hasattr(ssl.TLSVersion, min_tls):
            logger.warning(f"Unrecognized value for TABPY_MINIMUM_TLS_VERSION: {min_tls}")
            min_tls = "TLSv1_2"
            
        logger.info(f"Setting minimum TLS version to {min_tls}") 
        ssl_context.minimum_version = ssl.TLSVersion[min_tls]

        return ssl_context

    def _get_tls_certificates(self, config):
        tls_certificates = []
        cert = config[SettingsParameters.CertificateFile]
        key = config[SettingsParameters.KeyFile]
        with open(cert, "rb") as cert_file:
            tls_cert_chain = cert_file.read()
        with open(key, "rb") as key_file:
            tls_private_key = key_file.read()
        tls_certificates.append((tls_cert_chain, tls_private_key))
        return tls_certificates
    
    def _get_arrow_server(self, config):
        verify_client = None
        tls_certificates = None
        scheme = "grpc+tcp"
        if config[SettingsParameters.TransferProtocol] == "https":
            scheme = "grpc+tls"
            tls_certificates = self._get_tls_certificates(config)

        host = "0.0.0.0"
        port = config.get(SettingsParameters.ArrowFlightPort)
        location = "{}://{}:{}".format(scheme, host, port)

        auth_middleware = None
        if "authentication" in config[SettingsParameters.ApiVersions]["v1"]["features"]:
            _, creds = parse_pwd_file(config[ConfigParameters.TABPY_PWD_FILE])
            auth_middleware = {
                "basic": BasicAuthServerMiddlewareFactory(creds)
            }

        server = pa.FlightServer(host, location,
                            tls_certificates=tls_certificates,
                            verify_client=verify_client, auth_handler=NoOpAuthHandler(),
                            middleware=auth_middleware)
        return server

    def run(self):
        application = self._create_tornado_web_app()
        
        init_model_evaluator(self.settings, self.tabpy_state, self.python_service)

        protocol = self.settings[SettingsParameters.TransferProtocol]
        ssl_options = None
        if protocol == "https":
            ssl_options = self._initialize_ssl_context()
        elif protocol != "http":
            msg = f"Unsupported transfer protocol {protocol}."
            logger.critical(msg)
            raise RuntimeError(msg)

        settings = {}
        if self.settings[SettingsParameters.GzipEnabled] is True:
            settings["decompress_request"] = True

        application.listen(
            self.settings[SettingsParameters.Port],
            ssl_options=ssl_options,
            max_buffer_size=self.max_request_size,
            max_body_size=self.max_request_size,
            **settings,
        ) 

        logger.info(
            "Web service listening on port "
            f"{str(self.settings[SettingsParameters.Port])}"
        )

        if self.settings[SettingsParameters.ArrowEnabled]:
            def start_pyarrow():
                self.arrow_server = self._get_arrow_server(self.settings)
                pa.start(self.arrow_server)

            try:
                _thread.start_new_thread(start_pyarrow, ())
            except Exception as e:
                logger.critical(f"Failed to start PyArrow server: {e}")

        tornado.ioloop.IOLoop.instance().start()

    def _create_tornado_web_app(self):
        class TabPyTornadoApp(tornado.web.Application):
            is_closing = False

            def signal_handler(self, signal, _):
                logger.critical(f"Exiting on signal {signal}...")
                self.is_closing = True

            def try_exit(self):
                if self.is_closing:
                    tornado.ioloop.IOLoop.instance().stop()
                    logger.info("Shutting down TabPy...")

        logger.info("Initializing TabPy...")
        tornado.ioloop.IOLoop.instance().run_sync(
            lambda: init_ps_server(self.settings, self.tabpy_state)
        )
        logger.info("Done initializing TabPy.")

        executor = concurrent.futures.ThreadPoolExecutor(
            max_workers=multiprocessing.cpu_count()
        )

        # initialize Tornado application
        _init_asyncio_patch()
        application = TabPyTornadoApp(
            [
                (
                    self.subdirectory + r"/query/([^/]+)",
                    QueryPlaneHandler,
                    dict(app=self),
                ),
                (self.subdirectory + r"/status", StatusHandler, dict(app=self)),
                (self.subdirectory + r"/info", ServiceInfoHandler, dict(app=self)),
                (self.subdirectory + r"/endpoints", EndpointsHandler, dict(app=self)),
                (
                    self.subdirectory + r"/endpoints/([^/]+)?",
                    EndpointHandler,
                    dict(app=self),
                ),
                (
                    self.subdirectory + r"/evaluate",
                    EvaluationPlaneHandler if self.settings[SettingsParameters.EvaluateEnabled]
                    else EvaluationPlaneDisabledHandler,
                    dict(executor=executor, app=self),
                ),
                (
                    self.subdirectory + r"/configurations/endpoint_upload_destination",
                    UploadDestinationHandler,
                    dict(app=self),
                ),
                (
                    self.subdirectory + r"/(.*)",
                    tornado.web.StaticFileHandler,
                    dict(
                        path=self.settings[SettingsParameters.StaticPath],
                        default_filename="index.html",
                    ),
                ),
            ],
            debug=False,
            **self.settings,
        )

        signal.signal(signal.SIGINT, application.signal_handler)
        tornado.ioloop.PeriodicCallback(application.try_exit, 500).start()

        signal.signal(signal.SIGINT, application.signal_handler)
        tornado.ioloop.PeriodicCallback(application.try_exit, 500).start()

        return application

    def _set_parameter(self, parser, settings_key, config_key, default_val, parse_function):
        key_is_set = False

        if (
            config_key is not None
            and parser.has_section("TabPy")
            and parser.has_option("TabPy", config_key)
        ):
            if parse_function is None:
                parse_function = parser.get
            self.settings[settings_key] = parse_function("TabPy", config_key)
            key_is_set = True
            logger.debug(
                f"Parameter {settings_key} set to "
                f'"{self.settings[settings_key]}" '
                "from config file or environment variable"
            )

        if not key_is_set and default_val is not None:
            self.settings[settings_key] = default_val
            key_is_set = True
            logger.debug(
                f"Parameter {settings_key} set to "
                f'"{self.settings[settings_key]}" '
                "from default value"
            )

        if not key_is_set:
            logger.debug(f"Parameter {settings_key} is not set")

    def _parse_config(self, config_file):
        """Provide consistent mechanism for pulling in configuration.

        Attempt to retain backward compatibility for
        existing implementations by grabbing port
        setting from CLI first.

        Take settings in the following order:

        1. CLI arguments if present
        2. config file
        3. OS environment variables (for ease of
           setting defaults if not present)
        4. current defaults if a setting is not present in any location

        Additionally provide similar configuration capabilities in between
        config file and environment variables.
        For consistency use the same variable name in the config file as
        in the os environment.
        For naming standards use all capitals and start with 'TABPY_'
        """
        self.settings = {}
        self.subdirectory = ""
        self.tabpy_state = None
        self.python_service = None
        self.credentials = {}

        pkg_path = os.path.dirname(tabpy.__file__)

        parser = configparser.ConfigParser(os.environ)
        logger.info(f"Parsing config file {config_file}")

        file_exists = False
        if os.path.isfile(config_file):
            try:
                with open(config_file, 'r') as f:
                    parser.read_string(f.read())
                    file_exists = True
            except Exception:
                pass

        if not file_exists:
            logger.warning(
                f"Unable to open config file {config_file}, "
                "using default settings."
            )

        settings_parameters = [
            (SettingsParameters.Port, ConfigParameters.TABPY_PORT, 9004, None),
            (SettingsParameters.ServerVersion, None, __version__, None),
            (SettingsParameters.EvaluateEnabled, ConfigParameters.TABPY_EVALUATE_ENABLE,
             True, parser.getboolean),
            (SettingsParameters.EvaluateTimeout, ConfigParameters.TABPY_EVALUATE_TIMEOUT,
             30, parser.getfloat),
            (SettingsParameters.UploadDir, ConfigParameters.TABPY_QUERY_OBJECT_PATH,
             os.path.join(pkg_path, "tmp", "query_objects"), None),
            (SettingsParameters.TransferProtocol, ConfigParameters.TABPY_TRANSFER_PROTOCOL,
             "http", None),
            (SettingsParameters.CertificateFile, ConfigParameters.TABPY_CERTIFICATE_FILE,
             None, None),
            (SettingsParameters.KeyFile, ConfigParameters.TABPY_KEY_FILE, None, None),
            (SettingsParameters.MinimumTLSVersion, ConfigParameters.TABPY_MINIMUM_TLS_VERSION,
             "TLSv1_2", None),
            (SettingsParameters.StateFilePath, ConfigParameters.TABPY_STATE_PATH,
             os.path.join(pkg_path, "tabpy_server"), None),
            (SettingsParameters.StaticPath, ConfigParameters.TABPY_STATIC_PATH,
             os.path.join(pkg_path, "tabpy_server", "static"), None),
            (ConfigParameters.TABPY_PWD_FILE, ConfigParameters.TABPY_PWD_FILE, None, None),
            (SettingsParameters.LogRequestContext, ConfigParameters.TABPY_LOG_DETAILS,
             "false", None),
            (SettingsParameters.MaxRequestSizeInMb, ConfigParameters.TABPY_MAX_REQUEST_SIZE_MB,
             100, None),
            (SettingsParameters.GzipEnabled, ConfigParameters.TABPY_GZIP_ENABLE,
             True, parser.getboolean),
            (SettingsParameters.ArrowEnabled, ConfigParameters.TABPY_ARROW_ENABLE, False, parser.getboolean), 
            (SettingsParameters.ArrowFlightPort, ConfigParameters.TABPY_ARROWFLIGHT_PORT, 13622, parser.getint),
        ]

        for setting, parameter, default_val, parse_function in settings_parameters:
            self._set_parameter(parser, setting, parameter, default_val, parse_function)

        if not os.path.exists(self.settings[SettingsParameters.UploadDir]):
            os.makedirs(self.settings[SettingsParameters.UploadDir])

        # set and validate transfer protocol
        self.settings[SettingsParameters.TransferProtocol] = self.settings[
            SettingsParameters.TransferProtocol
        ].lower()

        self._validate_transfer_protocol_settings()
        
        # Set max request size in bytes
        self.max_request_size = (
            int(self.settings[SettingsParameters.MaxRequestSizeInMb]) * 1024 * 1024
        )
        logger.info(f"Setting max request size to {self.max_request_size} bytes")

        # if state.ini does not exist try and create it - remove
        # last dependence on batch/shell script
        self.settings[SettingsParameters.StateFilePath] = os.path.realpath(
            os.path.normpath(
                os.path.expanduser(self.settings[SettingsParameters.StateFilePath])
            )
        )
        state_config, self.tabpy_state = self._build_tabpy_state()

        self.python_service = PythonServiceHandler(PythonService())
        self.settings["compress_response"] = True
        self.settings[SettingsParameters.StaticPath] = os.path.abspath(
            self.settings[SettingsParameters.StaticPath]
        )
        logger.debug(
            f"Static pages folder set to "
            f'"{self.settings[SettingsParameters.StaticPath]}"'
        )

        # Set subdirectory from config if applicable
        if state_config.has_option("Service Info", "Subdirectory"):
            self.subdirectory = "/" + state_config.get("Service Info", "Subdirectory")

        # If passwords file specified load credentials
        if ConfigParameters.TABPY_PWD_FILE in self.settings:
            if not self._parse_pwd_file():
                msg = (
                    "Failed to read passwords file "
                    f"{self.settings[ConfigParameters.TABPY_PWD_FILE]}"
                )
                logger.critical(msg)
                raise RuntimeError(msg)
        else:
            self._handle_configuration_without_authentication()

        features = self._get_features()
        self.settings[SettingsParameters.ApiVersions] = {"v1": {"features": features}}

        self.settings[SettingsParameters.LogRequestContext] = (
            self.settings[SettingsParameters.LogRequestContext].lower() != "false"
        )
        call_context_state = (
            "enabled"
            if self.settings[SettingsParameters.LogRequestContext]
            else "disabled"
        )
        logger.info(f"Call context logging is {call_context_state}")

    def _validate_transfer_protocol_settings(self):
        if SettingsParameters.TransferProtocol not in self.settings:
            msg = "Missing transfer protocol information."
            logger.critical(msg)
            raise RuntimeError(msg)

        protocol = self.settings[SettingsParameters.TransferProtocol]

        if protocol == "http":
            return

        if protocol != "https":
            msg = f"Unsupported transfer protocol: {protocol}"
            logger.critical(msg)
            raise RuntimeError(msg)

        self._validate_cert_key_state(
            "The parameter(s) {} must be set.",
            SettingsParameters.CertificateFile in self.settings,
            SettingsParameters.KeyFile in self.settings,
        )
        cert = self.settings[SettingsParameters.CertificateFile]

        self._validate_cert_key_state(
            "The parameter(s) {} must point to " "an existing file.",
            os.path.isfile(cert),
            os.path.isfile(self.settings[SettingsParameters.KeyFile]),
        )
        tabpy.tabpy_server.app.util.validate_cert(cert)

    @staticmethod
    def _validate_cert_key_state(msg, cert_valid, key_valid):
        cert_and_key_param = (
            f"{ConfigParameters.TABPY_CERTIFICATE_FILE} and "
            f"{ConfigParameters.TABPY_KEY_FILE}"
        )
        https_error = "Error using HTTPS: "
        err = None
        if not cert_valid and not key_valid:
            err = https_error + msg.format(cert_and_key_param)
        elif not cert_valid:
            err = https_error + msg.format(ConfigParameters.TABPY_CERTIFICATE_FILE)
        elif not key_valid:
            err = https_error + msg.format(ConfigParameters.TABPY_KEY_FILE)

        if err is not None:
            logger.critical(err)
            raise RuntimeError(err)

    def _parse_pwd_file(self):
        succeeded, self.credentials = parse_pwd_file(
            self.settings[ConfigParameters.TABPY_PWD_FILE]
        )

        if succeeded and len(self.credentials) == 0:
            logger.error("No credentials found")
            succeeded = False

        return succeeded

    def _handle_configuration_without_authentication(self):
        std_no_auth_msg = "Password file is not specified: Authentication is not enabled"

        if self.disable_auth_warning == True:
            logger.info(std_no_auth_msg)
            return  

        confirm_no_auth_msg = "\nWARNING: This TabPy server is not currently configured for username/password authentication. "

        if self.settings[SettingsParameters.EvaluateEnabled]:
            confirm_no_auth_msg += ("This means that, because the TABPY_EVALUATE_ENABLE feature is enabled, there is " 
                "the potential that unauthenticated individuals may be able to remotely execute code on this machine. ")

        confirm_no_auth_msg += ("We strongly advise against proceeding without authentication as it poses a significant security risk.\n\n"
            "Do you wish to proceed without authentication? (y/N): ")

        confirm_no_auth_input = input(confirm_no_auth_msg)

        if confirm_no_auth_input == 'y':
            logger.info(std_no_auth_msg)
        else:
            print("\nAborting start up. To enable authentication for your TabPy server, see "
                "https://github.com/tableau/TabPy/blob/master/docs/server-config.md#authentication.")
            exit()

    def _get_features(self):
        features = {}

        # Check for auth
        if ConfigParameters.TABPY_PWD_FILE in self.settings:
            features["authentication"] = {
                "required": True,
                "methods": {"basic-auth": {}},
            }

        features["evaluate_enabled"] = self.settings[SettingsParameters.EvaluateEnabled]
        features["gzip_enabled"] = self.settings[SettingsParameters.GzipEnabled]
        features["arrow_enabled"] = self.settings[SettingsParameters.ArrowEnabled]
        return features

    def _build_tabpy_state(self):
        pkg_path = os.path.dirname(tabpy.__file__)
        state_file_dir = self.settings[SettingsParameters.StateFilePath]
        state_file_path = os.path.join(state_file_dir, "state.ini")
        if not os.path.isfile(state_file_path):
            state_file_template_path = os.path.join(
                pkg_path, "tabpy_server", "state.ini.template"
            )
            logger.debug(
                f"File {state_file_path} not found, creating from "
                f"template {state_file_template_path}..."
            )
            shutil.copy(state_file_template_path, state_file_path)

        logger.info(f"Loading state from state file {state_file_path}")
        tabpy_state = _get_state_from_file(state_file_dir)
        return tabpy_state, TabPyState(config=tabpy_state, settings=self.settings)


# Override _read_body to allow content with size exceeding max_body_size
# This enables proper handling of 413 errors in base_handler
def _read_body_allow_max_size(self, code, headers, delegate):
    if "Content-Length" in headers:
        content_length = int(headers["Content-Length"])
        if content_length > self._max_body_size:
            return
    return self.original_read_body(code, headers, delegate)

HTTP1Connection.original_read_body = HTTP1Connection._read_body
HTTP1Connection._read_body = _read_body_allow_max_size


1	1	import concurrent.futures
2	1	import configparser
3	1	import logging
4	1	import multiprocessing
5	1	import os
6	1	import shutil
7	1	import signal
8	1	import ssl
9	1	import sys
10	1	import _thread
11
12	1	import tornado
13	1	from tornado.http1connection import HTTP1Connection
14
15	1	import tabpy
16	1	import tabpy.tabpy_server.app.arrow_server as pa
17	1	from tabpy.tabpy import __version__
18	1	from tabpy.tabpy_server.app.app_parameters import ConfigParameters, SettingsParameters
19	1	from tabpy.tabpy_server.app.util import parse_pwd_file
20	1	from tabpy.tabpy_server.handlers.basic_auth_server_middleware_factory import BasicAuthServerMiddlewareFactory
21	1	from tabpy.tabpy_server.handlers.no_op_auth_handler import NoOpAuthHandler
22	1	from tabpy.tabpy_server.management.state import TabPyState
23	1	from tabpy.tabpy_server.management.util import _get_state_from_file
24	1	from tabpy.tabpy_server.psws.callbacks import init_model_evaluator, init_ps_server
25	1	from tabpy.tabpy_server.psws.python_service import PythonService, PythonServiceHandler
26	1	from tabpy.tabpy_server.handlers import (
27		EndpointHandler,
28		EndpointsHandler,
29		EvaluationPlaneHandler,
30		EvaluationPlaneDisabledHandler,
31		QueryPlaneHandler,
32		ServiceInfoHandler,
33		StatusHandler,
34		UploadDestinationHandler,
35		)
36
37	1	logger = logging.getLogger(__name__)
38
39	1	def _init_asyncio_patch():
40		"""
41		Select compatible event loop for Tornado 5+.
42		As of Python 3.8, the default event loop on Windows is `proactor`,
43		however Tornado requires the old default "selector" event loop.
44		As Tornado has decided to leave this to users to set, MkDocs needs
45		to set it. See https://github.com/tornadoweb/tornado/issues/2608.
46		"""
47	1	if sys.platform.startswith("win") and sys.version_info >= (3, 8):
48		import asyncio
49		try:
50		from asyncio import WindowsSelectorEventLoopPolicy
51		except ImportError:
52		pass # Can't assign a policy which doesn't exist.
53		else:
54		if not isinstance(asyncio.get_event_loop_policy(), WindowsSelectorEventLoopPolicy):
55		asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())
56
57
58	1	class TabPyApp:
59		"""
60		TabPy application class for keeping context like settings, state, etc.
61		"""
62
63	1	settings = {}
64	1	subdirectory = ""
65	1	tabpy_state = None
66	1	python_service = None
67	1	credentials = {}
68	1	arrow_server = None
69	1	max_request_size = None
70
71	1	def __init__(self, config_file, disable_auth_warning=True):
72	1	self.disable_auth_warning = disable_auth_warning
73	1	if config_file is None:
74	1	config_file = os.path.join(
75		os.path.dirname(__file__), os.path.pardir, "common", "default.conf"
76		)
77
78	1	if os.path.isfile(config_file):
79	1	try:
80	1	from logging import config
81	1	config.fileConfig(config_file, disable_existing_loggers=False)
82	1	except KeyError:
83	1	logging.basicConfig(level=logging.DEBUG)
84
85	1	self._parse_config(config_file)
86
87	1	def _initialize_ssl_context(self):
88		ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
89
90		ssl_context.load_cert_chain(
91		certfile=self.settings[SettingsParameters.CertificateFile],
92		keyfile=self.settings[SettingsParameters.KeyFile]
93		)
94
95		min_tls = self.settings[SettingsParameters.MinimumTLSVersion]
96		if not hasattr(ssl.TLSVersion, min_tls):
97		logger.warning(f"Unrecognized value for TABPY_MINIMUM_TLS_VERSION: {min_tls}")
98		min_tls = "TLSv1_2"
99
100		logger.info(f"Setting minimum TLS version to {min_tls}")
101		ssl_context.minimum_version = ssl.TLSVersion[min_tls]
102
103		return ssl_context
104
105	1	def _get_tls_certificates(self, config):
106		tls_certificates = []
107		cert = config[SettingsParameters.CertificateFile]
108		key = config[SettingsParameters.KeyFile]
109		with open(cert, "rb") as cert_file:
110		tls_cert_chain = cert_file.read()
111		with open(key, "rb") as key_file:
112		tls_private_key = key_file.read()
113		tls_certificates.append((tls_cert_chain, tls_private_key))
114		return tls_certificates
115
116	1	def _get_arrow_server(self, config):
117		verify_client = None
118		tls_certificates = None
119		scheme = "grpc+tcp"
120		if config[SettingsParameters.TransferProtocol] == "https":
121		scheme = "grpc+tls"
122		tls_certificates = self._get_tls_certificates(config)
123
124		host = "0.0.0.0"
125		port = config.get(SettingsParameters.ArrowFlightPort)
126		location = "{}://{}:{}".format(scheme, host, port)
127
128		auth_middleware = None
129		if "authentication" in config[SettingsParameters.ApiVersions]["v1"]["features"]:
130		_, creds = parse_pwd_file(config[ConfigParameters.TABPY_PWD_FILE])
131		auth_middleware = {
132		"basic": BasicAuthServerMiddlewareFactory(creds)
133		}
134
135		server = pa.FlightServer(host, location,
136		tls_certificates=tls_certificates,
137		verify_client=verify_client, auth_handler=NoOpAuthHandler(),
138		middleware=auth_middleware)
139		return server
140
141	1	def run(self):
142		application = self._create_tornado_web_app()
143
144		init_model_evaluator(self.settings, self.tabpy_state, self.python_service)
145
146		protocol = self.settings[SettingsParameters.TransferProtocol]
147		ssl_options = None
148		if protocol == "https":
149		ssl_options = self._initialize_ssl_context()
150		elif protocol != "http":
151		msg = f"Unsupported transfer protocol {protocol}."
152		logger.critical(msg)
153		raise RuntimeError(msg)
154
155		settings = {}
156		if self.settings[SettingsParameters.GzipEnabled] is True:
157		settings["decompress_request"] = True
158
159		application.listen(
160		self.settings[SettingsParameters.Port],
161		ssl_options=ssl_options,
162		max_buffer_size=self.max_request_size,
163		max_body_size=self.max_request_size,
164		**settings,
165		)
166
167		logger.info(
168		"Web service listening on port "
169		f"{str(self.settings[SettingsParameters.Port])}"
170		)
171
172		if self.settings[SettingsParameters.ArrowEnabled]:
173		def start_pyarrow():
174		self.arrow_server = self._get_arrow_server(self.settings)
175		pa.start(self.arrow_server)
176
177		try:
178		_thread.start_new_thread(start_pyarrow, ())
179		except Exception as e:
180		logger.critical(f"Failed to start PyArrow server: {e}")
181
182		tornado.ioloop.IOLoop.instance().start()
183
184	1	def _create_tornado_web_app(self):
185	1	class TabPyTornadoApp(tornado.web.Application):
186	1	is_closing = False
187
188	1	def signal_handler(self, signal, _):
189		logger.critical(f"Exiting on signal {signal}...")
190		self.is_closing = True
191
192	1	def try_exit(self):
193		if self.is_closing:
194		tornado.ioloop.IOLoop.instance().stop()
195		logger.info("Shutting down TabPy...")
196
197	1	logger.info("Initializing TabPy...")
198	1	tornado.ioloop.IOLoop.instance().run_sync(
199		lambda: init_ps_server(self.settings, self.tabpy_state)
200		)
201	1	logger.info("Done initializing TabPy.")
202
203	1	executor = concurrent.futures.ThreadPoolExecutor(
204		max_workers=multiprocessing.cpu_count()
205		)
206
207		# initialize Tornado application
208	1	_init_asyncio_patch()
209	1	application = TabPyTornadoApp(
210		[
211		(
212		self.subdirectory + r"/query/([^/]+)",
213		QueryPlaneHandler,
214		dict(app=self),
215		),
216		(self.subdirectory + r"/status", StatusHandler, dict(app=self)),
217		(self.subdirectory + r"/info", ServiceInfoHandler, dict(app=self)),
218		(self.subdirectory + r"/endpoints", EndpointsHandler, dict(app=self)),
219		(
220		self.subdirectory + r"/endpoints/([^/]+)?",
221		EndpointHandler,
222		dict(app=self),
223		),
224		(
225		self.subdirectory + r"/evaluate",
226		EvaluationPlaneHandler if self.settings[SettingsParameters.EvaluateEnabled]
227		else EvaluationPlaneDisabledHandler,
228		dict(executor=executor, app=self),
229		),
230		(
231		self.subdirectory + r"/configurations/endpoint_upload_destination",
232		UploadDestinationHandler,
233		dict(app=self),
234		),
235		(
236		self.subdirectory + r"/(.*)",
237		tornado.web.StaticFileHandler,
238		dict(
239		path=self.settings[SettingsParameters.StaticPath],
240		default_filename="index.html",
241		),
242		),
243		],
244		debug=False,
245		**self.settings,
246		)
247
248	1	signal.signal(signal.SIGINT, application.signal_handler)
249	1	tornado.ioloop.PeriodicCallback(application.try_exit, 500).start()
250
251	1	signal.signal(signal.SIGINT, application.signal_handler)
252	1	tornado.ioloop.PeriodicCallback(application.try_exit, 500).start()
253
254	1	return application
255
256	1	def _set_parameter(self, parser, settings_key, config_key, default_val, parse_function):
257	1	key_is_set = False
258
259	1	if (
260		config_key is not None
261		and parser.has_section("TabPy")
262		and parser.has_option("TabPy", config_key)
263		):
264	1	if parse_function is None:
265	1	parse_function = parser.get
266	1	self.settings[settings_key] = parse_function("TabPy", config_key)
267	1	key_is_set = True
268	1	logger.debug(
269		f"Parameter {settings_key} set to "
270		f'"{self.settings[settings_key]}" '
271		"from config file or environment variable"
272		)
273
274	1	if not key_is_set and default_val is not None:
275	1	self.settings[settings_key] = default_val
276	1	key_is_set = True
277	1	logger.debug(
278		f"Parameter {settings_key} set to "
279		f'"{self.settings[settings_key]}" '
280		"from default value"
281		)
282
283	1	if not key_is_set:
284	1	logger.debug(f"Parameter {settings_key} is not set")
285
286	1	def _parse_config(self, config_file):
287		"""Provide consistent mechanism for pulling in configuration.
288
289		Attempt to retain backward compatibility for
290		existing implementations by grabbing port
291		setting from CLI first.
292
293		Take settings in the following order:
294
295		1. CLI arguments if present
296		2. config file
297		3. OS environment variables (for ease of
298		setting defaults if not present)
299		4. current defaults if a setting is not present in any location
300
301		Additionally provide similar configuration capabilities in between
302		config file and environment variables.
303		For consistency use the same variable name in the config file as
304		in the os environment.
305		For naming standards use all capitals and start with 'TABPY_'
306		"""
307	1	self.settings = {}
308	1	self.subdirectory = ""
309	1	self.tabpy_state = None
310	1	self.python_service = None
311	1	self.credentials = {}
312
313	1	pkg_path = os.path.dirname(tabpy.__file__)
314
315	1	parser = configparser.ConfigParser(os.environ)
316	1	logger.info(f"Parsing config file {config_file}")
317
318	1	file_exists = False
319	1	if os.path.isfile(config_file):
320	1	try:
321	1	with open(config_file, 'r') as f:
322	1	parser.read_string(f.read())
323	1	file_exists = True
324	1	except Exception:
325	1	pass
326
327	1	if not file_exists:
328	1	logger.warning(
329		f"Unable to open config file {config_file}, "
330		"using default settings."
331		)
332
333	1	settings_parameters = [
334		(SettingsParameters.Port, ConfigParameters.TABPY_PORT, 9004, None),
335		(SettingsParameters.ServerVersion, None, __version__, None),
336		(SettingsParameters.EvaluateEnabled, ConfigParameters.TABPY_EVALUATE_ENABLE,
337		True, parser.getboolean),
338		(SettingsParameters.EvaluateTimeout, ConfigParameters.TABPY_EVALUATE_TIMEOUT,
339		30, parser.getfloat),
340		(SettingsParameters.UploadDir, ConfigParameters.TABPY_QUERY_OBJECT_PATH,
341		os.path.join(pkg_path, "tmp", "query_objects"), None),
342		(SettingsParameters.TransferProtocol, ConfigParameters.TABPY_TRANSFER_PROTOCOL,
343		"http", None),
344		(SettingsParameters.CertificateFile, ConfigParameters.TABPY_CERTIFICATE_FILE,
345		None, None),
346		(SettingsParameters.KeyFile, ConfigParameters.TABPY_KEY_FILE, None, None),
347		(SettingsParameters.MinimumTLSVersion, ConfigParameters.TABPY_MINIMUM_TLS_VERSION,
348		"TLSv1_2", None),
349		(SettingsParameters.StateFilePath, ConfigParameters.TABPY_STATE_PATH,
350		os.path.join(pkg_path, "tabpy_server"), None),
351		(SettingsParameters.StaticPath, ConfigParameters.TABPY_STATIC_PATH,
352		os.path.join(pkg_path, "tabpy_server", "static"), None),
353		(ConfigParameters.TABPY_PWD_FILE, ConfigParameters.TABPY_PWD_FILE, None, None),
354		(SettingsParameters.LogRequestContext, ConfigParameters.TABPY_LOG_DETAILS,
355		"false", None),
356		(SettingsParameters.MaxRequestSizeInMb, ConfigParameters.TABPY_MAX_REQUEST_SIZE_MB,
357		100, None),
358		(SettingsParameters.GzipEnabled, ConfigParameters.TABPY_GZIP_ENABLE,
359		True, parser.getboolean),
360		(SettingsParameters.ArrowEnabled, ConfigParameters.TABPY_ARROW_ENABLE, False, parser.getboolean),
361		(SettingsParameters.ArrowFlightPort, ConfigParameters.TABPY_ARROWFLIGHT_PORT, 13622, parser.getint),
362		]
363
364	1	for setting, parameter, default_val, parse_function in settings_parameters:
365	1	self._set_parameter(parser, setting, parameter, default_val, parse_function)
366
367	1	if not os.path.exists(self.settings[SettingsParameters.UploadDir]):
368	1	os.makedirs(self.settings[SettingsParameters.UploadDir])
369
370		# set and validate transfer protocol
371	1	self.settings[SettingsParameters.TransferProtocol] = self.settings[
372		SettingsParameters.TransferProtocol
373		].lower()
374
375	1	self._validate_transfer_protocol_settings()
376
377		# Set max request size in bytes
378	1	self.max_request_size = (
379		int(self.settings[SettingsParameters.MaxRequestSizeInMb]) * 1024 * 1024
380		)
381	1	logger.info(f"Setting max request size to {self.max_request_size} bytes")
382
383		# if state.ini does not exist try and create it - remove
384		# last dependence on batch/shell script
385	1	self.settings[SettingsParameters.StateFilePath] = os.path.realpath(
386		os.path.normpath(
387		os.path.expanduser(self.settings[SettingsParameters.StateFilePath])
388		)
389		)
390	1	state_config, self.tabpy_state = self._build_tabpy_state()
391
392	1	self.python_service = PythonServiceHandler(PythonService())
393	1	self.settings["compress_response"] = True
394	1	self.settings[SettingsParameters.StaticPath] = os.path.abspath(
395		self.settings[SettingsParameters.StaticPath]
396		)
397	1	logger.debug(
398		f"Static pages folder set to "
399		f'"{self.settings[SettingsParameters.StaticPath]}"'
400		)
401
402		# Set subdirectory from config if applicable
403	1	if state_config.has_option("Service Info", "Subdirectory"):
404	1	self.subdirectory = "/" + state_config.get("Service Info", "Subdirectory")
405
406		# If passwords file specified load credentials
407	1	if ConfigParameters.TABPY_PWD_FILE in self.settings:
408	1	if not self._parse_pwd_file():
409	1	msg = (
410		"Failed to read passwords file "
411		f"{self.settings[ConfigParameters.TABPY_PWD_FILE]}"
412		)
413	1	logger.critical(msg)
414	1	raise RuntimeError(msg)
415		else:
416	1	self._handle_configuration_without_authentication()
417
418	1	features = self._get_features()
419	1	self.settings[SettingsParameters.ApiVersions] = {"v1": {"features": features}}
420
421	1	self.settings[SettingsParameters.LogRequestContext] = (
422		self.settings[SettingsParameters.LogRequestContext].lower() != "false"
423		)
424	1	call_context_state = (
425		"enabled"
426		if self.settings[SettingsParameters.LogRequestContext]
427		else "disabled"
428		)
429	1	logger.info(f"Call context logging is {call_context_state}")
430
431	1	def _validate_transfer_protocol_settings(self):
432	1	if SettingsParameters.TransferProtocol not in self.settings:
433		msg = "Missing transfer protocol information."
434		logger.critical(msg)
435		raise RuntimeError(msg)
436
437	1	protocol = self.settings[SettingsParameters.TransferProtocol]
438
439	1	if protocol == "http":
440	1	return
441
442	1	if protocol != "https":
443	1	msg = f"Unsupported transfer protocol: {protocol}"
444	1	logger.critical(msg)
445	1	raise RuntimeError(msg)
446
447	1	self._validate_cert_key_state(
448		"The parameter(s) {} must be set.",
449		SettingsParameters.CertificateFile in self.settings,
450		SettingsParameters.KeyFile in self.settings,
451		)
452	1	cert = self.settings[SettingsParameters.CertificateFile]
453
454	1	self._validate_cert_key_state(
455		"The parameter(s) {} must point to " "an existing file.",
456		os.path.isfile(cert),
457		os.path.isfile(self.settings[SettingsParameters.KeyFile]),
458		)
459	1	tabpy.tabpy_server.app.util.validate_cert(cert)
460
461	1	@staticmethod
462	1	def _validate_cert_key_state(msg, cert_valid, key_valid):
463	1	cert_and_key_param = (
464		f"{ConfigParameters.TABPY_CERTIFICATE_FILE} and "
465		f"{ConfigParameters.TABPY_KEY_FILE}"
466		)
467	1	https_error = "Error using HTTPS: "
468	1	err = None
469	1	if not cert_valid and not key_valid:
470	1	err = https_error + msg.format(cert_and_key_param)
471	1	elif not cert_valid:
472	1	err = https_error + msg.format(ConfigParameters.TABPY_CERTIFICATE_FILE)
473	1	elif not key_valid:
474	1	err = https_error + msg.format(ConfigParameters.TABPY_KEY_FILE)
475
476	1	if err is not None:
477	1	logger.critical(err)
478	1	raise RuntimeError(err)
479
480	1	def _parse_pwd_file(self):
481	1	succeeded, self.credentials = parse_pwd_file(
482		self.settings[ConfigParameters.TABPY_PWD_FILE]
483		)
484
485	1	if succeeded and len(self.credentials) == 0:
486	1	logger.error("No credentials found")
487	1	succeeded = False
488
489	1	return succeeded
490
491	1	def _handle_configuration_without_authentication(self):
492	1	std_no_auth_msg = "Password file is not specified: Authentication is not enabled"
493
494	1	if self.disable_auth_warning == True:
495	1	logger.info(std_no_auth_msg)
496	1	return
497
498	1	confirm_no_auth_msg = "\nWARNING: This TabPy server is not currently configured for username/password authentication. "
499
500	1	if self.settings[SettingsParameters.EvaluateEnabled]:
501	1	confirm_no_auth_msg += ("This means that, because the TABPY_EVALUATE_ENABLE feature is enabled, there is "
502		"the potential that unauthenticated individuals may be able to remotely execute code on this machine. ")
503
504	1	confirm_no_auth_msg += ("We strongly advise against proceeding without authentication as it poses a significant security risk.\n\n"
505		"Do you wish to proceed without authentication? (y/N): ")
506
507	1	confirm_no_auth_input = input(confirm_no_auth_msg)
508
509	1	if confirm_no_auth_input == 'y':
510	1	logger.info(std_no_auth_msg)
511		else:
512		print("\nAborting start up. To enable authentication for your TabPy server, see "
513		"https://github.com/tableau/TabPy/blob/master/docs/server-config.md#authentication.")
514		exit()
515
516	1	def _get_features(self):
517	1	features = {}
518
519		# Check for auth
520	1	if ConfigParameters.TABPY_PWD_FILE in self.settings:
521	1	features["authentication"] = {
522		"required": True,
523		"methods": {"basic-auth": {}},
524		}
525
526	1	features["evaluate_enabled"] = self.settings[SettingsParameters.EvaluateEnabled]
527	1	features["gzip_enabled"] = self.settings[SettingsParameters.GzipEnabled]
528	1	features["arrow_enabled"] = self.settings[SettingsParameters.ArrowEnabled]
529	1	return features
530
531	1	def _build_tabpy_state(self):
532	1	pkg_path = os.path.dirname(tabpy.__file__)
533	1	state_file_dir = self.settings[SettingsParameters.StateFilePath]
534	1	state_file_path = os.path.join(state_file_dir, "state.ini")
535	1	if not os.path.isfile(state_file_path):
536		state_file_template_path = os.path.join(
537		pkg_path, "tabpy_server", "state.ini.template"
538		)
539		logger.debug(
540		f"File {state_file_path} not found, creating from "
541		f"template {state_file_template_path}..."
542		)
543		shutil.copy(state_file_template_path, state_file_path)
544
545	1	logger.info(f"Loading state from state file {state_file_path}")
546	1	tabpy_state = _get_state_from_file(state_file_dir)
547	1	return tabpy_state, TabPyState(config=tabpy_state, settings=self.settings)
548
549
550		# Override _read_body to allow content with size exceeding max_body_size
551		# This enables proper handling of 413 errors in base_handler
552	1	def _read_body_allow_max_size(self, code, headers, delegate):
553	1	if "Content-Length" in headers:
554	1	content_length = int(headers["Content-Length"])
555	1	if content_length > self._max_body_size:
556		return
557	1	return self.original_read_body(code, headers, delegate)
558
559	1	HTTP1Connection.original_read_body = HTTP1Connection._read_body
560		HTTP1Connection._read_body = _read_body_allow_max_size
561

tableau / TabPy

TabPyApp._initialize_ssl_context() A last analyzed 2024-11-25 22:00 UTC

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TabPyApp._initialize_ssl_context() A
last analyzed 2024-11-25 22:00 UTC