112 lines
4.1 KiB
Python
112 lines
4.1 KiB
Python
import os
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import json
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import posixpath
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import urllib.parse
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from http.server import SimpleHTTPRequestHandler, HTTPServer
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CONFIG_FILENAME = "config.json"
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def load_config():
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config_path = os.path.join(os.path.dirname(os.path.abspath(__file__)), CONFIG_FILENAME)
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with open(config_path, "r", encoding="utf-8") as f:
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return json.load(f)
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CONFIG = load_config()
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HOST = CONFIG.get("host", "0.0.0.0")
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PORT = CONFIG.get("port", 3232)
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# Maps a URL access key (long hex string, see generate_key.py) -> physical
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# folder on the server holding that client's files. A random hex key instead
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# of a plain name like "main" just makes the update path harder to stumble
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# upon by guessing; it does not stop someone who deliberately extracts the
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# key from the updater executable. If a key ever leaks, generate a new one
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# and update it here plus in the updater's CLIENT_KEYS - no need to touch
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# folder names or anything else.
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CLIENTS = CONFIG.get("clients", {})
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# Absolute, resolved base directories for each client key, computed once at
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# startup. Relative folder paths in config.json are resolved relative to
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# this script's own location, not the process's current working directory,
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# so `python server.py` works the same regardless of where it's launched
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# from. Every request is checked against these to make sure the final path
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# can never land outside the intended client folder.
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SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
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CLIENT_BASE_DIRS = {
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key: os.path.realpath(os.path.join(SCRIPT_DIR, folder))
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for key, folder in CLIENTS.items()
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}
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# A path that is guaranteed not to exist, used to force a 404 through the
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# normal http.server flow instead of ever falling back to serving files
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# from the script's own working directory.
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NONEXISTENT_PATH = os.path.join(os.path.abspath(os.sep), "__no_such_path__")
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class MultiClientHandler(SimpleHTTPRequestHandler):
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"""
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Serves files only under a URL path that starts with a known access key,
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e.g. /<hex-key>/manifest.json or /<hex-key>/some/file.
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Everything else gets a 404:
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- a bare "/" (the directory listing that exposes server.py, config.json,
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the raw client folders, etc.)
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- an unknown or missing key
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- any path that tries to escape the client folder (e.g. via "..")
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- directory listings even *inside* a valid client folder
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This is enforced by never letting execution fall through to the default
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SimpleHTTPRequestHandler behavior, which serves the process's current
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working directory.
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"""
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def _resolve_client_path(self, path):
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path = urllib.parse.urlparse(path).path
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path = urllib.parse.unquote(path)
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parts = [p for p in path.split('/') if p]
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if not parts:
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return None
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key = parts[0]
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if key not in CLIENT_BASE_DIRS:
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return None
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base_dir = CLIENT_BASE_DIRS[key]
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rel_parts = parts[1:]
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rel_path = posixpath.join(*rel_parts) if rel_parts else ""
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full_path = os.path.realpath(os.path.join(base_dir, rel_path))
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# Confirm the resolved path is still inside base_dir (blocks "..",
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# symlink tricks, etc.). commonpath needs both paths to exist on the
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# same drive/root, which realpath + os.path.join guarantees here.
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try:
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if os.path.commonpath([full_path, base_dir]) != base_dir:
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return None
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except ValueError:
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return None
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return full_path
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def translate_path(self, path):
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resolved = self._resolve_client_path(path)
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if resolved is None:
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return NONEXISTENT_PATH
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return resolved
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def list_directory(self, path):
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# Never render a directory listing, even for a path inside a valid
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# client folder - only exact file paths are servable.
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self.send_error(404, "Not Found")
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return None
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if __name__ == '__main__':
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server_address = (HOST, PORT)
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httpd = HTTPServer(server_address, MultiClientHandler)
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print(f"Server running on {HOST}:{PORT}...")
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print(f"Available client keys: {', '.join(CLIENTS.keys()) if CLIENTS else '(none configured)'}")
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httpd.serve_forever()
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