Files
webui/server.py
Cyprian Kowalczyk 04678b7b6e feat(server): add 30s connection timeout to prevent slow-client thread exhaustion (#198)
Set Handler.timeout = 30. Python's BaseHTTPRequestHandler.setup()
calls self.request.settimeout(timeout), which raises socket.timeout
on idle or slow connections after the configured duration.

This defends against Slowloris-style attacks where a client holds
connections open indefinitely, exhausting threads in ThreadingHTTPServer.
Also recovers threads from crashed clients with hung TCP connections.

Addresses #194.
2026-04-09 18:05:18 -07:00

93 lines
3.9 KiB
Python

"""
Hermes Web UI -- Main server entry point.
Thin routing shell: imports Handler, delegates to api/routes.py, runs server.
All business logic lives in api/*.
"""
import time
import traceback
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer
from urllib.parse import urlparse
from api.auth import check_auth
from api.config import HOST, PORT, STATE_DIR, SESSION_DIR, DEFAULT_WORKSPACE
from api.helpers import j
from api.routes import handle_get, handle_post
class Handler(BaseHTTPRequestHandler):
timeout = 30 # seconds — kills idle/incomplete connections to prevent thread exhaustion
server_version = 'HermesWebUI/0.2'
def log_message(self, fmt, *args): pass # suppress default Apache-style log
def log_request(self, code: str='-', size: str='-') -> None:
"""Structured JSON logs for each request."""
import json as _json
duration_ms = round((time.time() - getattr(self, '_req_t0', time.time())) * 1000, 1)
record = _json.dumps({
'ts': time.strftime('%Y-%m-%dT%H:%M:%SZ', time.gmtime()),
'method': self.command or '-',
'path': self.path or '-',
'status': int(code) if str(code).isdigit() else code,
'ms': duration_ms,
})
print(f'[webui] {record}', flush=True)
def do_GET(self) -> None:
self._req_t0 = time.time()
try:
parsed = urlparse(self.path)
if not check_auth(self, parsed): return
result = handle_get(self, parsed)
if result is False:
return j(self, {'error': 'not found'}, status=404)
except Exception as e:
print(f'[webui] ERROR {self.command} {self.path}\n' + traceback.format_exc(), flush=True)
return j(self, {'error': 'Internal server error'}, status=500)
def do_POST(self) -> None:
self._req_t0 = time.time()
try:
parsed = urlparse(self.path)
if not check_auth(self, parsed): return
result = handle_post(self, parsed)
if result is False:
return j(self, {'error': 'not found'}, status=404)
except Exception as e:
print(f'[webui] ERROR {self.command} {self.path}\n' + traceback.format_exc(), flush=True)
return j(self, {'error': 'Internal server error'}, status=500)
def main() -> None:
from api.config import print_startup_config, verify_hermes_imports, _HERMES_FOUND
print_startup_config()
# Security: warn if binding non-loopback without authentication
from api.auth import is_auth_enabled
if HOST not in ('127.0.0.1', '::1', 'localhost') and not is_auth_enabled():
print(f'[!!] WARNING: Binding to {HOST} with NO PASSWORD SET.', flush=True)
print(f' Anyone on the network can access your filesystem and agent.', flush=True)
print(f' Set a password via Settings or HERMES_WEBUI_PASSWORD env var.', flush=True)
print(f' To suppress: bind to 127.0.0.1 or set a password.', flush=True)
ok, missing, errors = verify_hermes_imports()
if not ok and _HERMES_FOUND:
print(f'[!!] Warning: Hermes agent found but missing modules: {missing}', flush=True)
for mod, err in errors.items():
print(f' {mod}: {err}', flush=True)
print(' Agent features may not work correctly.', flush=True)
STATE_DIR.mkdir(parents=True, exist_ok=True)
SESSION_DIR.mkdir(parents=True, exist_ok=True)
DEFAULT_WORKSPACE.mkdir(parents=True, exist_ok=True)
httpd = ThreadingHTTPServer((HOST, PORT), Handler)
print(f' Hermes Web UI listening on http://{HOST}:{PORT}', flush=True)
if HOST == '127.0.0.1':
print(f' Remote access: ssh -N -L {PORT}:127.0.0.1:{PORT} <user>@<your-server>', flush=True)
print(f' Then open: http://localhost:{PORT}', flush=True)
print('', flush=True)
httpd.serve_forever()
if __name__ == '__main__':
main()