455 lines
16 KiB
Python
455 lines
16 KiB
Python
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#!/usr/bin/env python3
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# -*- coding: utf-8 -*-
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#
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# Project ___| | | | _ \| |
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# / __| | | | |_) | |
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# | (__| |_| | _ <| |___
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# \___|\___/|_| \_\_____|
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#
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# Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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#
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# This software is licensed as described in the file COPYING, which
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# you should have received as part of this distribution. The terms
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# are also available at https://curl.se/docs/copyright.html.
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#
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# You may opt to use, copy, modify, merge, publish, distribute and/or sell
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# copies of the Software, and permit persons to whom the Software is
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# furnished to do so, under the terms of the COPYING file.
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#
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# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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# KIND, either express or implied.
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#
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# SPDX-License-Identifier: curl
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#
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"""Server for testing SMB"""
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from __future__ import (absolute_import, division, print_function,
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unicode_literals)
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import argparse
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import logging
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import os
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import signal
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import sys
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import tempfile
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import threading
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# Import our curl test data helper
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from util import ClosingFileHandler, TestData
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if sys.version_info.major >= 3:
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import configparser
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else:
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import ConfigParser as configparser
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# impacket needs to be installed in the Python environment
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try:
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import impacket
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except ImportError:
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sys.stderr.write('Python package impacket needs to be installed!\n')
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sys.stderr.write('Use pip or your package manager to install it.\n')
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sys.exit(1)
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from impacket import smb as imp_smb
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from impacket import smbserver as imp_smbserver
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from impacket.nt_errors import (STATUS_ACCESS_DENIED, STATUS_NO_SUCH_FILE,
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STATUS_SUCCESS)
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log = logging.getLogger(__name__)
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SERVER_MAGIC = "SERVER_MAGIC"
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TESTS_MAGIC = "TESTS_MAGIC"
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VERIFIED_REQ = "verifiedserver"
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VERIFIED_RSP = "WE ROOLZ: {pid}\n"
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class ShutdownHandler(threading.Thread):
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"""Cleanly shut down the SMB server
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This can only be done from another thread while the server is in
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serve_forever(), so a thread is spawned here that waits for a shutdown
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signal before doing its thing. Use in a with statement around the
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serve_forever() call.
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"""
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def __init__(self, server):
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super(ShutdownHandler, self).__init__()
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self.server = server
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self.shutdown_event = threading.Event()
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def __enter__(self):
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self.start()
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signal.signal(signal.SIGINT, self._sighandler)
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signal.signal(signal.SIGTERM, self._sighandler)
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def __exit__(self, *_):
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# Call for shutdown just in case it wasn't done already
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self.shutdown_event.set()
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# Wait for thread, and therefore also the server, to finish
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self.join()
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# Uninstall our signal handlers
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signal.signal(signal.SIGINT, signal.SIG_DFL)
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signal.signal(signal.SIGTERM, signal.SIG_DFL)
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# Delete any temporary files created by the server during its run
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log.info("Deleting %d temporary files", len(self.server.tmpfiles))
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for f in self.server.tmpfiles:
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os.unlink(f)
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def _sighandler(self, _signum, _frame):
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# Wake up the cleanup task
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self.shutdown_event.set()
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def run(self):
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# Wait for shutdown signal
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self.shutdown_event.wait()
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# Notify the server to shut down
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self.server.shutdown()
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def smbserver(options):
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"""Start up a TCP SMB server that serves forever
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"""
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if options.pidfile:
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pid = os.getpid()
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# see tests/server/util.c function write_pidfile
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if os.name == "nt":
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pid += 65536
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with open(options.pidfile, "w") as f:
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f.write(str(pid))
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# Here we write a mini config for the server
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smb_config = configparser.ConfigParser()
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smb_config.add_section("global")
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smb_config.set("global", "server_name", "SERVICE")
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smb_config.set("global", "server_os", "UNIX")
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smb_config.set("global", "server_domain", "WORKGROUP")
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smb_config.set("global", "log_file", "")
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smb_config.set("global", "credentials_file", "")
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# We need a share which allows us to test that the server is running
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smb_config.add_section("SERVER")
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smb_config.set("SERVER", "comment", "server function")
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smb_config.set("SERVER", "read only", "yes")
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smb_config.set("SERVER", "share type", "0")
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smb_config.set("SERVER", "path", SERVER_MAGIC)
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# Have a share for tests. These files will be autogenerated from the
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# test input.
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smb_config.add_section("TESTS")
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smb_config.set("TESTS", "comment", "tests")
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smb_config.set("TESTS", "read only", "yes")
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smb_config.set("TESTS", "share type", "0")
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smb_config.set("TESTS", "path", TESTS_MAGIC)
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if not options.srcdir or not os.path.isdir(options.srcdir):
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raise ScriptException("--srcdir is mandatory")
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test_data_dir = os.path.join(options.srcdir, "data")
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smb_server = TestSmbServer((options.host, options.port),
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config_parser=smb_config,
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test_data_directory=test_data_dir)
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log.info("[SMB] setting up SMB server on port %s", options.port)
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smb_server.processConfigFile()
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# Start a thread that cleanly shuts down the server on a signal
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with ShutdownHandler(smb_server):
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# This will block until smb_server.shutdown() is called
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smb_server.serve_forever()
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return 0
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class TestSmbServer(imp_smbserver.SMBSERVER):
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"""
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Test server for SMB which subclasses the impacket SMBSERVER and provides
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test functionality.
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"""
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def __init__(self,
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address,
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config_parser=None,
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test_data_directory=None):
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imp_smbserver.SMBSERVER.__init__(self,
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address,
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config_parser=config_parser)
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self.tmpfiles = []
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# Set up a test data object so we can get test data later.
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self.ctd = TestData(test_data_directory)
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# Override smbComNtCreateAndX so we can pretend to have files which
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# don't exist.
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self.hookSmbCommand(imp_smb.SMB.SMB_COM_NT_CREATE_ANDX,
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self.create_and_x)
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def create_and_x(self, conn_id, smb_server, smb_command, recv_packet):
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"""
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Our version of smbComNtCreateAndX looks for special test files and
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fools the rest of the framework into opening them as if they were
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normal files.
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"""
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conn_data = smb_server.getConnectionData(conn_id)
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# Wrap processing in a try block which allows us to throw SmbException
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# to control the flow.
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try:
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ncax_parms = imp_smb.SMBNtCreateAndX_Parameters(
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smb_command["Parameters"])
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path = self.get_share_path(conn_data,
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ncax_parms["RootFid"],
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recv_packet["Tid"])
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log.info("[SMB] Requested share path: %s", path)
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disposition = ncax_parms["Disposition"]
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log.debug("[SMB] Requested disposition: %s", disposition)
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# Currently we only support reading files.
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if disposition != imp_smb.FILE_OPEN:
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raise SmbException(STATUS_ACCESS_DENIED,
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"Only support reading files")
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# Check to see if the path we were given is actually a
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# magic path which needs generating on the fly.
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if path not in [SERVER_MAGIC, TESTS_MAGIC]:
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# Pass the command onto the original handler.
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return imp_smbserver.SMBCommands.smbComNtCreateAndX(conn_id,
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smb_server,
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smb_command,
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recv_packet)
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flags2 = recv_packet["Flags2"]
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ncax_data = imp_smb.SMBNtCreateAndX_Data(flags=flags2,
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data=smb_command[
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"Data"])
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requested_file = imp_smbserver.decodeSMBString(
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flags2,
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ncax_data["FileName"])
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log.debug("[SMB] User requested file '%s'", requested_file)
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if path == SERVER_MAGIC:
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fid, full_path = self.get_server_path(requested_file)
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else:
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assert (path == TESTS_MAGIC)
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fid, full_path = self.get_test_path(requested_file)
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self.tmpfiles.append(full_path)
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resp_parms = imp_smb.SMBNtCreateAndXResponse_Parameters()
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resp_data = ""
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# Simple way to generate a fid
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if len(conn_data["OpenedFiles"]) == 0:
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fakefid = 1
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else:
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fakefid = conn_data["OpenedFiles"].keys()[-1] + 1
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resp_parms["Fid"] = fakefid
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resp_parms["CreateAction"] = disposition
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if os.path.isdir(path):
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resp_parms[
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"FileAttributes"] = imp_smb.SMB_FILE_ATTRIBUTE_DIRECTORY
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resp_parms["IsDirectory"] = 1
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else:
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resp_parms["IsDirectory"] = 0
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resp_parms["FileAttributes"] = ncax_parms["FileAttributes"]
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# Get this file's information
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resp_info, error_code = imp_smbserver.queryPathInformation(
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os.path.dirname(full_path), os.path.basename(full_path),
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level=imp_smb.SMB_QUERY_FILE_ALL_INFO)
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if error_code != STATUS_SUCCESS:
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raise SmbException(error_code, "Failed to query path info")
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resp_parms["CreateTime"] = resp_info["CreationTime"]
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resp_parms["LastAccessTime"] = resp_info[
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"LastAccessTime"]
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resp_parms["LastWriteTime"] = resp_info["LastWriteTime"]
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resp_parms["LastChangeTime"] = resp_info[
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"LastChangeTime"]
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resp_parms["FileAttributes"] = resp_info[
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"ExtFileAttributes"]
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resp_parms["AllocationSize"] = resp_info[
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"AllocationSize"]
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resp_parms["EndOfFile"] = resp_info["EndOfFile"]
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# Let's store the fid for the connection
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# smbServer.log("Create file %s, mode:0x%x" % (pathName, mode))
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conn_data["OpenedFiles"][fakefid] = {}
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conn_data["OpenedFiles"][fakefid]["FileHandle"] = fid
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conn_data["OpenedFiles"][fakefid]["FileName"] = path
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conn_data["OpenedFiles"][fakefid]["DeleteOnClose"] = False
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except SmbException as s:
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log.debug("[SMB] SmbException hit: %s", s)
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error_code = s.error_code
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resp_parms = ""
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resp_data = ""
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resp_cmd = imp_smb.SMBCommand(imp_smb.SMB.SMB_COM_NT_CREATE_ANDX)
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resp_cmd["Parameters"] = resp_parms
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resp_cmd["Data"] = resp_data
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smb_server.setConnectionData(conn_id, conn_data)
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return [resp_cmd], None, error_code
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def get_share_path(self, conn_data, root_fid, tid):
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conn_shares = conn_data["ConnectedShares"]
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if tid in conn_shares:
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if root_fid > 0:
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# If we have a rootFid, the path is relative to that fid
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path = conn_data["OpenedFiles"][root_fid]["FileName"]
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log.debug("RootFid present %s!" % path)
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else:
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if "path" in conn_shares[tid]:
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path = conn_shares[tid]["path"]
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else:
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raise SmbException(STATUS_ACCESS_DENIED,
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"Connection share had no path")
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else:
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raise SmbException(imp_smbserver.STATUS_SMB_BAD_TID,
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"TID was invalid")
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return path
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def get_server_path(self, requested_filename):
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log.debug("[SMB] Get server path '%s'", requested_filename)
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if requested_filename not in [VERIFIED_REQ]:
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raise SmbException(STATUS_NO_SUCH_FILE, "Couldn't find the file")
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fid, filename = tempfile.mkstemp()
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log.debug("[SMB] Created %s (%d) for storing '%s'",
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filename, fid, requested_filename)
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contents = ""
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if requested_filename == VERIFIED_REQ:
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log.debug("[SMB] Verifying server is alive")
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pid = os.getpid()
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# see tests/server/util.c function write_pidfile
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if os.name == "nt":
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pid += 65536
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contents = VERIFIED_RSP.format(pid=pid).encode('utf-8')
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self.write_to_fid(fid, contents)
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return fid, filename
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def write_to_fid(self, fid, contents):
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# Write the contents to file descriptor
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os.write(fid, contents)
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os.fsync(fid)
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# Rewind the file to the beginning so a read gets us the contents
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os.lseek(fid, 0, os.SEEK_SET)
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def get_test_path(self, requested_filename):
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log.info("[SMB] Get reply data from 'test%s'", requested_filename)
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fid, filename = tempfile.mkstemp()
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log.debug("[SMB] Created %s (%d) for storing test '%s'",
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filename, fid, requested_filename)
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try:
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contents = self.ctd.get_test_data(requested_filename).encode('utf-8')
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self.write_to_fid(fid, contents)
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return fid, filename
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except Exception:
|
||
|
|
log.exception("Failed to make test file")
|
||
|
|
raise SmbException(STATUS_NO_SUCH_FILE, "Failed to make test file")
|
||
|
|
|
||
|
|
|
||
|
|
class SmbException(Exception):
|
||
|
|
def __init__(self, error_code, error_message):
|
||
|
|
super(SmbException, self).__init__(error_message)
|
||
|
|
self.error_code = error_code
|
||
|
|
|
||
|
|
|
||
|
|
class ScriptRC(object):
|
||
|
|
"""Enum for script return codes"""
|
||
|
|
SUCCESS = 0
|
||
|
|
FAILURE = 1
|
||
|
|
EXCEPTION = 2
|
||
|
|
|
||
|
|
|
||
|
|
class ScriptException(Exception):
|
||
|
|
pass
|
||
|
|
|
||
|
|
|
||
|
|
def get_options():
|
||
|
|
parser = argparse.ArgumentParser()
|
||
|
|
|
||
|
|
parser.add_argument("--port", action="store", default=9017,
|
||
|
|
type=int, help="port to listen on")
|
||
|
|
parser.add_argument("--host", action="store", default="127.0.0.1",
|
||
|
|
help="host to listen on")
|
||
|
|
parser.add_argument("--verbose", action="store", type=int, default=0,
|
||
|
|
help="verbose output")
|
||
|
|
parser.add_argument("--pidfile", action="store",
|
||
|
|
help="file name for the PID")
|
||
|
|
parser.add_argument("--logfile", action="store",
|
||
|
|
help="file name for the log")
|
||
|
|
parser.add_argument("--srcdir", action="store", help="test directory")
|
||
|
|
parser.add_argument("--id", action="store", help="server ID")
|
||
|
|
parser.add_argument("--ipv4", action="store_true", default=0,
|
||
|
|
help="IPv4 flag")
|
||
|
|
|
||
|
|
return parser.parse_args()
|
||
|
|
|
||
|
|
|
||
|
|
def setup_logging(options):
|
||
|
|
"""
|
||
|
|
Set up logging from the command line options
|
||
|
|
"""
|
||
|
|
root_logger = logging.getLogger()
|
||
|
|
add_stdout = False
|
||
|
|
|
||
|
|
formatter = logging.Formatter("%(asctime)s %(levelname)-5.5s %(message)s")
|
||
|
|
|
||
|
|
# Write out to a logfile
|
||
|
|
if options.logfile:
|
||
|
|
handler = ClosingFileHandler(options.logfile)
|
||
|
|
handler.setFormatter(formatter)
|
||
|
|
handler.setLevel(logging.DEBUG)
|
||
|
|
root_logger.addHandler(handler)
|
||
|
|
else:
|
||
|
|
# The logfile wasn't specified. Add a stdout logger.
|
||
|
|
add_stdout = True
|
||
|
|
|
||
|
|
if options.verbose:
|
||
|
|
# Add a stdout logger as well in verbose mode
|
||
|
|
root_logger.setLevel(logging.DEBUG)
|
||
|
|
add_stdout = True
|
||
|
|
else:
|
||
|
|
root_logger.setLevel(logging.INFO)
|
||
|
|
|
||
|
|
if add_stdout:
|
||
|
|
stdout_handler = logging.StreamHandler(sys.stdout)
|
||
|
|
stdout_handler.setFormatter(formatter)
|
||
|
|
stdout_handler.setLevel(logging.DEBUG)
|
||
|
|
root_logger.addHandler(stdout_handler)
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == '__main__':
|
||
|
|
# Get the options from the user.
|
||
|
|
options = get_options()
|
||
|
|
|
||
|
|
# Setup logging using the user options
|
||
|
|
setup_logging(options)
|
||
|
|
|
||
|
|
# Run main script.
|
||
|
|
try:
|
||
|
|
rc = smbserver(options)
|
||
|
|
except Exception as e:
|
||
|
|
log.exception(e)
|
||
|
|
rc = ScriptRC.EXCEPTION
|
||
|
|
|
||
|
|
if options.pidfile and os.path.isfile(options.pidfile):
|
||
|
|
os.unlink(options.pidfile)
|
||
|
|
|
||
|
|
log.info("[SMB] Returning %d", rc)
|
||
|
|
sys.exit(rc)
|