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| 1 | +#!/usr/bin/env python3 |
| 2 | +import http.server |
| 3 | +import ssl |
| 4 | +import socketserver |
| 5 | +import sys |
| 6 | +import os |
| 7 | +import argparse |
| 8 | +from typing import Any |
| 9 | + |
| 10 | +class NixCacheHandler(http.server.BaseHTTPRequestHandler): |
| 11 | + protocol_version: str = 'HTTP/1.1' |
| 12 | + |
| 13 | + def do_GET(self) -> None: |
| 14 | + # Get client certificate information |
| 15 | + try: |
| 16 | + client_cert: dict[str, Any] | None = self.request.getpeercert() |
| 17 | + except Exception as e: |
| 18 | + print(f"Error getting client certificate: {e}", file=sys.stderr) |
| 19 | + self.send_error(403, "Invalid client certificate") |
| 20 | + return |
| 21 | + |
| 22 | + if not client_cert: |
| 23 | + self.send_error(403, "No client certificate provided") |
| 24 | + return |
| 25 | + |
| 26 | + # Additional validation - check if certificate chain is valid |
| 27 | + subject: tuple[tuple[tuple[str, str], ...], ...] | None = client_cert.get('subject') |
| 28 | + if not subject: |
| 29 | + self.send_error(403, "Invalid client certificate: No subject") |
| 30 | + return |
| 31 | + |
| 32 | + # Log client info |
| 33 | + print(f"Client connected: {subject}", file=sys.stderr) |
| 34 | + print(f"Path requested: {self.path}", file=sys.stderr) |
| 35 | + |
| 36 | + # Handle nix-cache-info endpoint |
| 37 | + if self.path == '/nix-cache-info': |
| 38 | + self.send_response(200) |
| 39 | + self.send_header('Content-Type', 'text/plain') |
| 40 | + self.send_header('Connection', 'close') # Explicitly close after response |
| 41 | + test_root: str | None = os.environ.get('TEST_ROOT') |
| 42 | + if not test_root: |
| 43 | + store_root: str = '/nix/store' |
| 44 | + else: |
| 45 | + store_root = os.path.join(test_root, 'store') |
| 46 | + |
| 47 | + # Nix cache info format |
| 48 | + cache_info: str = f"""StoreDir: {store_root} |
| 49 | +WantMassQuery: 1 |
| 50 | +Priority: 30 |
| 51 | +""" |
| 52 | + self.send_header('Content-Length', str(len(cache_info))) |
| 53 | + self.end_headers() |
| 54 | + self.wfile.write(cache_info.encode()) |
| 55 | + self.wfile.flush() # Ensure data is sent |
| 56 | + |
| 57 | + # Handle .narinfo requests |
| 58 | + elif self.path.endswith('.narinfo'): |
| 59 | + # Return 404 for all narinfo requests (empty cache) |
| 60 | + self.send_response(404) |
| 61 | + self.send_header('Content-Length', '0') |
| 62 | + self.send_header('Connection', 'close') |
| 63 | + self.end_headers() |
| 64 | + |
| 65 | + else: |
| 66 | + self.send_response(404) |
| 67 | + self.send_header('Content-Length', '0') |
| 68 | + self.send_header('Connection', 'close') |
| 69 | + self.end_headers() |
| 70 | + |
| 71 | + def log_message(self, format: str, *args: Any) -> None: |
| 72 | + # Suppress standard logging |
| 73 | + pass |
| 74 | + |
| 75 | +def run_server(port: int, certfile: str, keyfile: str, ca_certfile: str) -> None: |
| 76 | + # Create SSL context |
| 77 | + context: ssl.SSLContext = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) |
| 78 | + context.load_cert_chain(certfile=certfile, keyfile=keyfile) |
| 79 | + context.verify_mode = ssl.VerifyMode.CERT_REQUIRED |
| 80 | + context.check_hostname = False # We're not checking hostnames for client certs |
| 81 | + context.load_verify_locations(cafile=ca_certfile) |
| 82 | + |
| 83 | + # Create and start server |
| 84 | + httpd: socketserver.TCPServer = socketserver.TCPServer(('localhost', port), NixCacheHandler) |
| 85 | + httpd.socket = context.wrap_socket(httpd.socket, server_side=True) |
| 86 | + |
| 87 | + print(f"Server running on port {port}", file=sys.stderr) |
| 88 | + |
| 89 | + try: |
| 90 | + httpd.serve_forever() |
| 91 | + except KeyboardInterrupt: |
| 92 | + httpd.shutdown() |
| 93 | + |
| 94 | +if __name__ == "__main__": |
| 95 | + parser: argparse.ArgumentParser = argparse.ArgumentParser(description='Nix binary cache server with SSL client verification') |
| 96 | + parser.add_argument('--port', type=int, default=8443, help='Port to listen on') |
| 97 | + parser.add_argument('--cert', required=True, help='Server certificate file') |
| 98 | + parser.add_argument('--key', required=True, help='Server private key file') |
| 99 | + parser.add_argument('--ca-cert', required=True, help='CA certificate for client verification') |
| 100 | + |
| 101 | + args: argparse.Namespace = parser.parse_args() |
| 102 | + |
| 103 | + run_server(args.port, args.cert, args.key, args.ca_cert) |
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