├── .gitignore ├── LICENSE.md ├── README.md ├── pyproject.toml └── webimport ├── __init__.py ├── server.py └── webimport.py /.gitignore: -------------------------------------------------------------------------------- 1 | webimport.egg-info/ 2 | __pycache__/ 3 | -------------------------------------------------------------------------------- /LICENSE.md: -------------------------------------------------------------------------------- 1 | GNU GENERAL PUBLIC LICENSE 2 | Version 3, 29 June 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU General Public License is a free, copyleft license for 11 | software and other kinds of works. 12 | 13 | The licenses for most software and other practical works are designed 14 | to take away your freedom to share and change the works. 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It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # WebImport 2 | Import python libraries over HTTP. 3 | This package allows you to load python modules on a system where these packages may not be available. 4 | It uses a HTTP connection to fetch these packages remotely. 5 | 6 | This package is written for Python3.4 or newer. 7 | 8 | ## Use cases 9 | * Running dynamic code from a read-only filesystem 10 | * Using non-standard packages on a machine without leaving traces 11 | * Testing code on devices you cannot install packages on 12 | 13 | ## How to use 14 | If WebImporter is available on a given system, you can import it as shown below: 15 | ```python 16 | import webimport 17 | webimport.register(location='some.http.server', port=8080, override=False) 18 | ``` 19 | The register command takes 3 arguments. 20 | * location (optional): The host to connect to. Default: localhost 21 | * port (optional): The port to connect to. Default: 8080 22 | * override: (optional): Try to import from remote first. Default: False 23 | 24 | ### Preparing the server 25 | To create the webserver to serve the libraries, you should create a single directory containing all these packages. 26 | 27 | To do this, an easy method to do this would be: 28 | ```sh 29 | mkdir my_package_dir 30 | pip install --target my_package_dir 31 | ``` 32 | 33 | ### Example uses: 34 | #### Running scripts with shared modules over ssh: 35 | 36 | First Terminal 37 | ```sh 38 | cd /path/to/python/libs 39 | python3 -m "http.server" 8000 40 | ``` 41 | Second Terminal 42 | ```sh 43 | cat webimport/webimport.py script.py | ssh -R 8000:localhost:8000 user@some.server 'cat -|python3' 44 | ``` 45 | 46 | #### Running scripts without SSH tunnel: 47 | Set up the webserver with the webimport-server command (requires pip installation of webimport): 48 | ```sh 49 | webimport-server my_package_dir 50 | ``` 51 | 52 | From the other device, you can run any of the following: 53 | 54 | **Open a terminal and pre-load the webimport code** 55 | ```sh 56 | python3 -i -c "$(curl server-url:8080/_hook)" 57 | ``` 58 | -------------------------------------------------------------------------------- /pyproject.toml: -------------------------------------------------------------------------------- 1 | [project] 2 | name = "webimport" 3 | version = "0.2.0" 4 | description = "Enables python to import modules over a http connection" 5 | readme = "README.md" 6 | license = {file = "LICENSE.md"} 7 | requires-python = ">=3.4" 8 | #keywords = ["automation"] 9 | 10 | authors = [ 11 | {name = "Pieter-Jan Moreels", email = "pieter-jan@pidgey.net" } 12 | ] 13 | 14 | maintainers = [ 15 | {name = "Pieter-Jan Moreels", email = "pieter-jan@pidgey.net" } 16 | ] 17 | 18 | # For a list of valid classifiers, see https://pypi.org/classifiers/ 19 | classifiers = [ # Optional 20 | "License :: OSI Approved :: GPL-3.0 License", 21 | 22 | "Programming Language :: Python :: 3", 23 | "Programming Language :: Python :: 3.4", 24 | "Programming Language :: Python :: 3.5", 25 | "Programming Language :: Python :: 3.6", 26 | "Programming Language :: Python :: 3.7", 27 | "Programming Language :: Python :: 3.8", 28 | "Programming Language :: Python :: 3.9", 29 | "Programming Language :: Python :: 3.10", 30 | "Programming Language :: Python :: 3.11", 31 | "Programming Language :: Python :: 3.12", 32 | "Programming Language :: Python :: 3 :: Only", 33 | ] 34 | 35 | dependencies = [ 36 | "click" 37 | ] 38 | 39 | [project.urls] 40 | "Homepage" = "https://github.com/NorthernSec/WebImport" 41 | "Bug Reports" = "https://github.com/NorthernSec/WebImport/issues" 42 | "Source" = "https://github.com/NorthernSec/WebImport" 43 | 44 | [project.scripts] 45 | webimport-server = "webimport.server:run" 46 | 47 | 48 | [build-system] 49 | requires = ["setuptools>=43.0.0", "wheel"] 50 | build-backend = "setuptools.build_meta" 51 | 52 | [tool.setuptools] 53 | packages = ["webimport"] 54 | -------------------------------------------------------------------------------- /webimport/__init__.py: -------------------------------------------------------------------------------- 1 | # __init__.py 2 | """WebImport module. 3 | 4 | This module contains the "webimport" import handler. 5 | 6 | Attributes: 7 | logger (logging.logger): The logger for the WebImporter. 8 | 9 | Functions: 10 | register(location=None, port=None, override=False): Registers a webimport handler. 11 | 12 | Usage: 13 | ```python 14 | # Depending on the method of loading webimport, either: 15 | register('my.server', 8080) 16 | # or 17 | webimport.register('my.server', 8080) 18 | # Then: 19 | import my_module 20 | ``` 21 | """ 22 | 23 | from webimport.webimport import register 24 | from webimport.webimport import logger 25 | -------------------------------------------------------------------------------- /webimport/server.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | """WebImport-Server. 3 | 4 | This library provides a simple http.server for webimport, and made available through 5 | webimport-server. 6 | It provides access to python libraries from the specified directory, for use by the 7 | remote device. 8 | It also adds a /_hook endpoint that provides the webimport code, so that it can be 9 | easily obtained remotely. 10 | 11 | Classes: 12 | CustomHandler: Custom handler for the built-in http.server 13 | 14 | Methods: 15 | run(directory, port): Run the server from within a specified directory, on a 16 | specified port. 17 | """ 18 | import inspect 19 | import os 20 | import click 21 | 22 | from http.server import HTTPServer, SimpleHTTPRequestHandler 23 | from webimport import webimport 24 | 25 | class CustomHandler(SimpleHTTPRequestHandler): 26 | """Custom handler for the built-in http.server. 27 | 28 | Methods: 29 | do_GET(): Override the default GET method to add the /_hook endpoint. 30 | """ 31 | def do_GET(self): 32 | """Overridden GET method with the addition of the /_hook endpoint.""" 33 | if self.path == '/_hook': 34 | self.send_response(200) 35 | code = inspect.getsource(webimport) 36 | self.send_header('Content-type', 'text/plain') 37 | self.end_headers() 38 | self.wfile.write(code.encode()) 39 | else: 40 | super().do_GET() 41 | 42 | 43 | @click.command() 44 | @click.argument('directory', required=True) 45 | @click.option('-p', '--port', type=int, default=8080) 46 | def run(directory, port): 47 | """Run the webserver. 48 | 49 | Args: 50 | directory (str): The directory to server. This should be your package directory. 51 | port (int): The port you want to serve on. Default: 8080. 52 | """ 53 | os.chdir(directory) # Change to the specified directory 54 | httpd = HTTPServer(('', port), CustomHandler) 55 | print('Serving on port %s from directory "%s"...'%(port, directory)) 56 | httpd.serve_forever() 57 | 58 | if __name__ == "__main__": 59 | run() 60 | -------------------------------------------------------------------------------- /webimport/webimport.py: -------------------------------------------------------------------------------- 1 | #!/usr/bin/env python3 2 | """WebImport. 3 | 4 | This library provides a remote import handler called "webimport". 5 | 6 | Classes: 7 | WebImporter: 8 | 9 | Methods: 10 | register(): Register the webimport import handler with specified settigns. 11 | flush_modules(): Flush out currently loaded modules. 12 | """ 13 | # Flags 14 | _MOD_IS_PRESENT_ = 1 15 | _MOD_NOT_PRESENT_ = 0 16 | _MOD_SEARCHING_ = -1 17 | _MOD_UNKNOWN_ = -2 18 | 19 | # Imports 20 | import encodings.idna 21 | import http.client 22 | import importlib 23 | import importlib.abc 24 | import importlib.util 25 | import logging 26 | import sys 27 | 28 | # Logger 29 | _LOG_LEVEL_ = logging.WARNING 30 | logging.basicConfig(level=_LOG_LEVEL_, format='%(levelname)-7s:%(message)s') 31 | logger = logging.getLogger("WIMP") 32 | 33 | 34 | def register(location=None, port=None, override=False): 35 | """Register the WebImport import handler with certain settings. 36 | 37 | Args: 38 | location (str): The url of the webserver. 39 | port (int): The port of the webserver. 40 | override (bool): Set to True if you want to prioritize external libraries 41 | over local ones. 42 | Notes: 43 | Please note that you can register multiple webimport loaders. Keep that in 44 | mind in case you run into bugs. You can check your `sys.meta_path` for 45 | the available import handlers, and remove them from there if necessary. 46 | """ 47 | WebImporter.location = location or 'localhost' 48 | WebImporter.port = port or 8080 49 | WebImporter.override = override 50 | if not isinstance(WebImporter.location, str): 51 | raise ValueError("location' should be a string") 52 | if not isinstance(WebImporter.port, int): 53 | raise ValueError("'port' should be an integer") 54 | logger.info("Registered to %s:%s, override: %s"%(location, port, override)) 55 | if override: 56 | flush_modules() 57 | sys.meta_path.insert(0,WebImporter()) 58 | 59 | 60 | def flush_modules(): 61 | """'un-imports' all non-system libraries that are not used by webimport.""" 62 | mods = list({x.__name__ for x in sys.modules.values()}) 63 | for key in mods: 64 | if (not key.startswith('_') and not 'importlib' in key and 65 | key not in ['sys', 'builtins', 'encodings.idna', 66 | 'http.client', 'logging']): 67 | del sys.modules[key] 68 | logger.debug("[%s] Flushed"%key) 69 | logger.info("Flushed all non-system modules") 70 | 71 | 72 | class WebImporter(importlib.abc.SourceLoader, importlib.abc.MetaPathFinder): 73 | """The "WebImporter" import handler class. 74 | 75 | Methods: 76 | 77 | """ 78 | port = None 79 | location = 'localhost' 80 | override = False 81 | modules = {} # structure: [present local, present remote] 82 | logger.info("Initialized") 83 | 84 | 85 | def _is_present_locally(self, fullname): 86 | """Checks if a library is present locally.""" 87 | status = self.modules.get(fullname, [_MOD_UNKNOWN_, _MOD_UNKNOWN_]) 88 | if status[0] == _MOD_UNKNOWN_: 89 | logger.debug("[%s] |- Not chached. Searching..."%fullname) 90 | status[0] = _MOD_SEARCHING_ 91 | self.modules[fullname] = status 92 | loader = importlib.util.find_spec(fullname) 93 | status[0] = _MOD_IS_PRESENT_ if loader else _MOD_NOT_PRESENT_ 94 | self.modules[fullname] = status 95 | if bool(status[0]): 96 | logger.info("[%s] | |- Found locally"%fullname) 97 | else: 98 | logger.info("[%s] | |- Not found locally"%fullname) 99 | return bool(status[0]) 100 | 101 | 102 | def _is_present_remote(self, fullname): 103 | """Checks if a library is present remotely.""" 104 | status = self.modules.get(fullname, [_MOD_UNKNOWN_, _MOD_UNKNOWN_]) 105 | try: 106 | logger.info("[%s] |- Checking remote availability"%fullname) 107 | r = self._do_search(fullname) 108 | except ValueError as e: 109 | print(e) 110 | status[1] = _MOD_NOT_PRESENT_ 111 | else: 112 | if r != None: 113 | logger.debug("[%s] | |- Available at %s"%(fullname, r)) 114 | status[1] = r 115 | else: 116 | logger.debug("[%s] | |- Not available remote"%fullname) 117 | status[1] = _MOD_NOT_PRESENT_ 118 | self.modules[fullname] = status 119 | return bool(status[1]) 120 | 121 | 122 | def is_package(self, fullname): 123 | """Checks if the provided name is that of a package (is an __init__.py). 124 | 125 | Args: 126 | fullname (str): the full name of a package. 127 | 128 | Returns: 129 | bool: True if the module is a package. 130 | """ 131 | path = self.modules.get(fullname, ['', ''])[1] 132 | return path.endswith('/__init__.py') 133 | 134 | 135 | def get_filename(self, fullname): 136 | """Gets the filename.""" 137 | return fullname 138 | 139 | 140 | def find_module(self, fullname, *args, **kwargs): 141 | """Checks if WebImport can and should load this module. 142 | 143 | Args: 144 | fullname (str): The full path of the module. 145 | 146 | Returns: 147 | None | WebImporter: Returns itself if WebImport should load the module, 148 | otherwise returns None 149 | """ 150 | logger.info("[%s] Finding module"%fullname) 151 | status = self.modules.get(fullname, [_MOD_UNKNOWN_, _MOD_UNKNOWN_]) 152 | # If find_module is triggered while searching locally, ignore 153 | if status[0] == _MOD_SEARCHING_: 154 | return None 155 | # Unless overridden: First try to import locally 156 | if not self.override and self._is_present_locally(fullname): 157 | logger.debug("[%s] |- Loading locally instead"%fullname) 158 | return None 159 | # Check if package is available remotely 160 | if self._is_present_remote(fullname): 161 | logger.debug("[%s] |- WAMP can load this"%fullname) 162 | return self 163 | return None 164 | 165 | 166 | def find_spec(self, fullname, path, target=None): 167 | """Gets the spec of the library""" 168 | if not self.find_module(fullname,path): 169 | return None 170 | logger.info("[%s] |- Loading spec"%fullname) 171 | if self.is_package(fullname): 172 | logger.debug("[%s] | |- Spec is a package"%fullname) 173 | origin = self.modules.get(fullname)[1] 174 | spec = importlib.util.spec_from_loader(fullname, self, origin=origin, 175 | is_package=self.is_package(fullname)) 176 | return spec 177 | 178 | 179 | def get_data(self, fullname): 180 | """Gets the module code from the remote server. 181 | 182 | Args: 183 | fullname (str): The full path of the module you want to load. 184 | 185 | Returns: 186 | str: The code of the module. 187 | """ 188 | logger.info("[%s] |- Fetching source"%fullname) 189 | try: 190 | assert isinstance(self.port, int) 191 | # We assume that by this point, we have located the module 192 | path = self.modules[fullname][1] 193 | url = self.get_filename(fullname) 194 | r = self._do_request(path) 195 | if r.status == 200: 196 | logger.debug("[%s] | |- Source found"%fullname) 197 | code = r.read() 198 | elif self.is_package(fullname): 199 | # init missing. add empty one 200 | logger.debug("[%s] | |- Source missing. Using empty __init__.py"%fullname) 201 | code = '' 202 | else: 203 | logger.error("[%s] | |- Not available remote!"%fullname) 204 | raise Exception("Module not available remotely") 205 | # Build module 206 | return code 207 | except Exception as e: 208 | logger.error("[%s] Exception happened: %s"%(fullname, e)) 209 | return None 210 | 211 | 212 | def _do_search(self, fullname): 213 | """Check if the module is available remotely, and return the file name. 214 | 215 | Args: 216 | fullname (str): The full name of the module. 217 | 218 | Returns: 219 | str | None: The path of the module on the remote server or None 220 | """ 221 | # We're dealing with dirs here 222 | fullname = '/'.join(fullname.split('.')) 223 | for extension in ["", '.py']: 224 | test = fullname+extension 225 | c = http.client.HTTPConnection(self.location, self.port) 226 | c.request("HEAD", test) 227 | r = c.getresponse() 228 | if r.status == 200: 229 | return test 230 | elif r.status == 301: 231 | return test+'/__init__.py' 232 | return None 233 | 234 | 235 | def _do_request(self, fullname): 236 | """Make a request to the remote server. 237 | 238 | Args: 239 | fullname (str): The full name of the requested module. 240 | 241 | Returns: 242 | http.client.HTTPResponse: The response of the webserver 243 | """ 244 | c = http.client.HTTPConnection(self.location, self.port) 245 | c.request("GET", fullname) 246 | return c.getresponse() 247 | --------------------------------------------------------------------------------