172 lines
6.0 KiB
Python
172 lines
6.0 KiB
Python
#!/usr/bin/env python3
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"""
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HTTP service emulator using Flask.
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Accepts all requests, logs every detail (method, path, headers, body),
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and responds with configurable pages. Forwards events as JSON to LOG_TARGET if set.
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"""
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from __future__ import annotations
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import json
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import logging
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import os
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from pathlib import Path
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from flask import Flask, request, send_from_directory
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from werkzeug.middleware.proxy_fix import ProxyFix
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from werkzeug.serving import make_server, WSGIRequestHandler
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import instance_seed as _seed
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from syslog_bridge import (
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classify_authorization,
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extract_form_credentials,
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forward_syslog,
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start_fp_socket_reader,
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syslog_line,
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write_syslog_file,
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)
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logging.getLogger("werkzeug").setLevel(logging.ERROR)
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NODE_NAME = os.environ.get("NODE_NAME", "webserver")
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SERVICE_NAME = "http"
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LOG_TARGET = os.environ.get("LOG_TARGET", "")
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PORT = int(os.environ.get("PORT", "8080"))
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# Per-instance Server header. Every decky running one identical Apache
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# version string is a one-query fleet discovery for any scanner.
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# Distribution shaped toward currently-deployed-in-the-wild versions.
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_SERVER_CHOICES = [
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"Apache/2.4.41 (Ubuntu)",
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"Apache/2.4.52 (Ubuntu)",
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"Apache/2.4.54 (Debian)",
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"Apache/2.4.56 (Debian)",
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"Apache/2.4.57 (Debian)",
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"Apache/2.4.58 (Ubuntu)",
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"Apache/2.4.59 (Debian)",
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"nginx/1.18.0 (Ubuntu)",
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"nginx/1.22.1",
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"nginx/1.24.0 (Ubuntu)",
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"nginx/1.25.3",
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]
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SERVER_HEADER = os.environ.get("SERVER_HEADER") or _seed.pick(_SERVER_CHOICES)
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RESPONSE_CODE = int(os.environ.get("RESPONSE_CODE", "403"))
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FAKE_APP = os.environ.get("FAKE_APP", "")
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EXTRA_HEADERS = json.loads(os.environ.get("EXTRA_HEADERS", "{}"))
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CUSTOM_BODY = os.environ.get("CUSTOM_BODY", "")
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FILES_DIR = os.environ.get("FILES_DIR", "")
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_FAKE_APP_BODIES: dict[str, str] = {
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"apache_default": (
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"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
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"<html><head><title>Apache2 Debian Default Page</title></head>\n"
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"<body><h1>Apache2 Debian Default Page</h1>\n"
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"<p>It works!</p></body></html>"
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),
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"nginx_default": (
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"<!DOCTYPE html><html><head><title>Welcome to nginx!</title></head>\n"
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"<body><h1>Welcome to nginx!</h1>\n"
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"<p>If you see this page, the nginx web server is successfully installed.</p>\n"
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"</body></html>"
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),
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"wordpress": (
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"<!DOCTYPE html><html><head><title>WordPress › Error</title></head>\n"
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"<body id=\"error-page\"><div class=\"wp-die-message\">\n"
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"<h1>Error establishing a database connection</h1></div></body></html>"
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),
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"phpmyadmin": (
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"<!DOCTYPE html><html><head><title>phpMyAdmin</title></head>\n"
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"<body><form method=\"post\" action=\"index.php\">\n"
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"<input type=\"text\" name=\"pma_username\" />\n"
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"<input type=\"password\" name=\"pma_password\" />\n"
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"<input type=\"submit\" value=\"Go\" /></form></body></html>"
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),
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"iis_default": (
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"<!DOCTYPE html><html><head><title>IIS Windows Server</title></head>\n"
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"<body><h1>IIS Windows Server</h1>\n"
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"<p>Welcome to Internet Information Services</p></body></html>"
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),
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}
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app = Flask(__name__)
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app.wsgi_app = ProxyFix(app.wsgi_app, x_for=1, x_proto=1, x_host=1) # type: ignore[method-assign]
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@app.after_request
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def _fix_server_header(response):
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response.headers["Server"] = SERVER_HEADER
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return response
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def _log(event_type: str, severity: int = 6, **kwargs) -> None:
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line = syslog_line(SERVICE_NAME, NODE_NAME, event_type, severity, **kwargs)
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write_syslog_file(line)
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forward_syslog(line, LOG_TARGET)
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@app.before_request
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def log_request():
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# Cred extraction precedence:
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# 1. Authorization header (Basic / Bearer / Digest)
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# 2. POST form body (application/x-www-form-urlencoded with
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# common login field names: username/user/email/login/...)
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# Header wins when present — the form body might be a follow-up
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# password change or a reset, while the Authorization is the
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# current session credential.
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body = request.get_data(as_text=True)[:4096]
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cred = (
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classify_authorization(request.headers.get("Authorization"))
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or extract_form_credentials(body, request.headers.get("Content-Type"))
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)
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_log(
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"request",
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method=request.method,
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path=request.path,
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remote_addr=request.remote_addr,
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headers=json.dumps(dict(request.headers)),
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body=body[:512],
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**(cred or {}),
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)
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@app.route("/", defaults={"path": ""})
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@app.route("/<path:path>", methods=["GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS", "HEAD"])
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def catch_all(path):
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# Serve static files directory if configured
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if FILES_DIR and path:
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files_path = Path(FILES_DIR) / path
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if files_path.is_file():
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return send_from_directory(FILES_DIR, path)
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# Select response body: custom > fake_app preset > default 403
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if CUSTOM_BODY:
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body = CUSTOM_BODY
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elif FAKE_APP and FAKE_APP in _FAKE_APP_BODIES:
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body = _FAKE_APP_BODIES[FAKE_APP]
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else:
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body = (
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"<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">\n"
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"<html><head>\n"
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"<title>403 Forbidden</title>\n"
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"</head><body>\n"
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"<h1>Forbidden</h1>\n"
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"<p>You don't have permission to access this resource.</p>\n"
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"<hr>\n"
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f"<address>{SERVER_HEADER} Server at {NODE_NAME} Port 80</address>\n"
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"</body></html>\n"
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)
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headers = {"Content-Type": "text/html", **EXTRA_HEADERS}
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return body, RESPONSE_CODE, headers
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class _SilentHandler(WSGIRequestHandler):
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"""Suppress Werkzeug's Server header so Flask's after_request is the sole source."""
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def version_string(self) -> str:
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return ""
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if __name__ == "__main__":
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_log("startup", msg=f"HTTP server starting as {NODE_NAME}")
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start_fp_socket_reader(NODE_NAME, SERVICE_NAME, LOG_TARGET)
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srv = make_server("127.0.0.1", PORT, app, request_handler=_SilentHandler)
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srv.serve_forever()
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