Implement 5 MB file size limit enforcement
Enhanced both FicheServer and LinesServer to reject data transfers exceeding a 5MB limit by introducing a max_size parameter across server classes, request handlers, and CLI arguments. This change improves system stability and security by preventing excessive resource use. Additionally, customized HTTP responses are provided for missing or invalid Content-Length headers and oversized files, creating a clearer client-server communication and ensuring better request validation logic.
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9338b9163e
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4 changed files with 34 additions and 4 deletions
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@ -21,6 +21,7 @@ class FicheServer:
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slug_size: int = 8
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https: bool = False
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buffer_size: int = 4096
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max_size: int = 5242880 # 5 MB by default
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_output_dir: pathlib.Path = pathlib.Path('data/')
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_log_file: Optional[pathlib.Path] = None
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_banlist: Optional[pathlib.Path] = None
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@ -92,6 +93,7 @@ class FicheServer:
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fiche.banlist = args.banlist or fiche.banlist
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fiche.allowlist = args.allowlist or fiche.allowlist
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fiche.buffer_size = args.buffer_size or fiche.buffer_size
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fiche.max_size = args.max_size or fiche.max_size
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fiche.logger = logging.getLogger('pyfiche')
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fiche.logger.setLevel(logging.INFO if not args.debug else logging.DEBUG)
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@ -181,6 +183,11 @@ class FicheServer:
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received_data.extend(data)
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if len(received_data) > self.max_size:
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self.logger.error(f"Received data exceeds maximum size ({self.max_size} bytes), terminating connection.")
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conn.sendall(b"Data exceeds maximum size.\n")
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return
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except socket.timeout:
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pass
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@ -67,7 +67,13 @@ body {{
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# Reject any POST requests that don't have a Content-Length header
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if "Content-Length" not in self.headers:
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return self.not_found()
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return self.invalid_request()
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if not self.headers["Content-Length"].isdigit():
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return self.invalid_request()
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if int(self.headers["Content-Length"]) > self.max_size:
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return self.file_too_large()
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# Upload the file
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@ -92,6 +98,16 @@ body {{
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self.send_header("Location", f"/{slug}")
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self.end_headers()
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def invalid_request(self):
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self.send_response(400)
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self.end_headers()
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self.wfile.write(b"Invalid request")
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def file_too_large(self):
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self.send_response(413)
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self.end_headers()
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self.wfile.write(b"File too large")
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def not_found(self):
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self.send_response(404)
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self.end_headers()
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@ -211,13 +227,16 @@ body {{
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self.wfile.write(full_html.encode("utf-8"))
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def make_lines_handler(data_dir, logger, banlist=None, allowlist=None):
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def make_lines_handler(
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data_dir, logger, banlist=None, allowlist=None, max_size=5242880
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):
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class CustomHandler(LinesHTTPRequestHandler):
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def __init__(self, *args, **kwargs):
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self.data_dir: pathlib.Path = data_dir
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self.logger: logging.Logger = logger
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self.banlist: Optional[pathlib.Path] = banlist
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self.allowlist: Optional[pathlib.Path] = allowlist
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self.max_size: int = max_size
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super().__init__(*args, **kwargs)
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@ -227,6 +246,7 @@ def make_lines_handler(data_dir, logger, banlist=None, allowlist=None):
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class LinesServer:
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port: int = 9997
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listen_addr: str = "0.0.0.0"
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max_size: int = 5242880 # 5 MB by default
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_data_dir: pathlib.Path = pathlib.Path("data/")
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_log_file: Optional[pathlib.Path] = None
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_banlist: Optional[pathlib.Path] = None
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@ -295,6 +315,7 @@ class LinesServer:
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lines.port = args.port or lines.port
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lines.listen_addr = args.listen_addr or lines.listen_addr
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lines.max_size = args.max_size or lines.max_size
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lines.data_dir = args.data_dir or lines.data_dir
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lines.log_file = args.log_file or lines.log_file
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lines.banlist = args.banlist or lines.banlist
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@ -316,7 +337,7 @@ class LinesServer:
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def run(self):
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handler_class = make_lines_handler(
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self.data_dir, self.logger, self.banlist, self.allowlist
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self.data_dir, self.logger, self.banlist, self.allowlist, self.max_size
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)
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with HTTPServer((self.listen_addr, self.port), handler_class) as httpd:
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@ -17,6 +17,7 @@ def main():
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parser.add_argument('-S', '--https', action='store_true', help='HTTPS (requires reverse proxy)')
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parser.add_argument('-o', '--output_dir', help='Output directory path (default: data/)')
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parser.add_argument('-B', '--buffer_size', type=int, help='Buffer size (default: 4096)')
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parser.add_argument('-M', '--max_size', type=int, help='Maximum file size (in bytes) (default: 5242880)')
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parser.add_argument('-l', '--log_file', help='Log file path (default: None - log to stdout)')
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parser.add_argument('-b', '--banlist', help='Banlist file path')
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parser.add_argument('-w', '--allowlist', help='Allowlist file path')
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@ -16,6 +16,7 @@ def main():
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parser.add_argument('-l', '--log_file', help='Log file path (default: None - log to stdout)')
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parser.add_argument('-b', '--banlist', help='Banlist file path')
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parser.add_argument('-w', '--allowlist', help='Allowlist file path')
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parser.add_argument('-M', '--max_size', type=int, help='Maximum file size (in bytes) (default: 5242880)')
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parser.add_argument('-D', '--debug', action='store_true', help='Debug mode')
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# Parse the arguments
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