Add per-service customization, stealth hardening, and BYOS support

- HTTP: configurable server_header, response_code, fake_app presets
  (apache/nginx/wordpress/phpmyadmin/iis), extra_headers, custom_body,
  static files directory mount
- SSH/Cowrie: configurable kernel_version, hardware_platform, ssh_banner,
  and users/passwords via COWRIE_USERDB_ENTRIES; switched to build mode
  so cowrie.cfg.j2 persona fields and userdb.txt generation work
- SMTP: configurable banner and MTA hostname
- MySQL: configurable version string in protocol greeting
- Redis: configurable redis_version and os string in INFO response
- BYOS: [custom-*] INI sections define bring-your-own Docker services
- Stealth: rename all *_honeypot.py → server.py; replace HONEYPOT_NAME
  env var with NODE_NAME across all 22+ service templates and plugins;
  strip "honeypot" from all in-container file content
- Config: DeckyConfig.service_config dict; INI [decky-N.svc] subsections;
  composer passes service_cfg to compose_fragment
- 350 tests passing (100%)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

templates/postgres/server.py

@@ -0,0 +1,129 @@
+#!/usr/bin/env python3
+"""
+PostgreSQLserver.
+Reads the startup message, extracts username and database, responds with
+an AuthenticationMD5Password challenge, logs the hash sent back, then
+returns an error. Logs all interactions as JSON.
+"""
+
+import asyncio
+import json
+import os
+import socket
+import struct
+from datetime import datetime, timezone
+
+NODE_NAME = os.environ.get("NODE_NAME", "pgserver")
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+SALT = b"\xde\xad\xbe\xef"
+
+# AuthenticationMD5Password: 'R' + length(12) + auth_type(5) + salt(4)
+_AUTH_MD5 = b"R" + struct.pack(">I", 12) + struct.pack(">I", 5) + SALT
+
+def _error_response(message: str) -> bytes:
+    body = b"S" + b"FATAL\x00" + b"M" + message.encode() + b"\x00\x00"
+    return b"E" + struct.pack(">I", len(body) + 4) + body
+
+
+def _forward(event: dict) -> None:
+    if not LOG_TARGET:
+        return
+    try:
+        host, port = LOG_TARGET.rsplit(":", 1)
+        with socket.create_connection((host, int(port)), timeout=3) as s:
+            s.sendall((json.dumps(event) + "\n").encode())
+    except Exception:
+        pass
+
+
+def _log(event_type: str, **kwargs) -> None:
+    event = {
+        "ts": datetime.now(timezone.utc).isoformat(),
+        "service": "postgres",
+        "host": NODE_NAME,
+        "event": event_type,
+        **kwargs,
+    }
+    print(json.dumps(event), flush=True)
+    _forward(event)
+
+
+class PostgresProtocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = None
+        self._buf = b""
+        self._state = "startup"
+
+    def connection_made(self, transport):
+        self._transport = transport
+        self._peer = transport.get_extra_info("peername", ("?", 0))
+        _log("connect", src=self._peer[0], src_port=self._peer[1])
+
+    def data_received(self, data):
+        self._buf += data
+        self._process()
+
+    def _process(self):
+        if self._state == "startup":
+            if len(self._buf) < 4:
+                return
+            msg_len = struct.unpack(">I", self._buf[:4])[0]
+            if len(self._buf) < msg_len:
+                return
+            msg = self._buf[:msg_len]
+            self._buf = self._buf[msg_len:]
+            self._handle_startup(msg)
+        elif self._state == "auth":
+            if len(self._buf) < 5:
+                return
+            msg_type = chr(self._buf[0])
+            msg_len = struct.unpack(">I", self._buf[1:5])[0]
+            if len(self._buf) < msg_len + 1:
+                return
+            payload = self._buf[5:msg_len + 1]
+            self._buf = self._buf[msg_len + 1:]
+            if msg_type == "p":
+                self._handle_password(payload)
+
+    def _handle_startup(self, msg: bytes):
+        # Startup message: length(4) + protocol_version(4) + params (key=value\0 pairs)
+        if len(msg) < 8:
+            return
+        proto = struct.unpack(">I", msg[4:8])[0]
+        if proto == 80877103:  # SSL request
+            self._transport.write(b"N")  # reject SSL
+            return
+        params_raw = msg[8:].split(b"\x00")
+        params = {}
+        for i in range(0, len(params_raw) - 1, 2):
+            k = params_raw[i].decode(errors="replace")
+            v = params_raw[i + 1].decode(errors="replace") if i + 1 < len(params_raw) else ""
+            if k:
+                params[k] = v
+        username = params.get("user", "")
+        database = params.get("database", "")
+        _log("startup", src=self._peer[0], username=username, database=database)
+        self._state = "auth"
+        self._transport.write(_AUTH_MD5)
+
+    def _handle_password(self, payload: bytes):
+        pw_hash = payload.rstrip(b"\x00").decode(errors="replace")
+        _log("auth", src=self._peer[0], pw_hash=pw_hash)
+        self._transport.write(_error_response("password authentication failed"))
+        self._transport.close()
+
+    def connection_lost(self, exc):
+        _log("disconnect", src=self._peer[0] if self._peer else "?")
+
+
+async def main():
+    _log("startup", msg=f"PostgreSQL server starting as {NODE_NAME}")
+    loop = asyncio.get_running_loop()
+    server = await loop.create_server(PostgresProtocol, "0.0.0.0", 5432)
+    async with server:
+        await server.serve_forever()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())