Add 20 honeypot services: email, DB, ICS, cloud, IoT, network protocols

Tier 1 (upstream images): telnet (cowrie), smtp (mailoney),
elasticsearch (elasticpot), conpot (Modbus/S7/SNMP ICS).

Tier 2 (custom asyncio honeypots): pop3, imap, mysql, mssql, redis,
mongodb, postgres, ldap, vnc, docker_api, k8s, sip, mqtt, llmnr, snmp,
tftp — each with Dockerfile, entrypoint, and protocol-accurate
handshake/credential capture.

Adds 256 pytest cases covering registration, compose fragments,
LOG_TARGET propagation, and Dockerfile presence for all 25 services.

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

templates/pop3/Dockerfile

@@ -0,0 +1,12 @@
+FROM debian:bookworm-slim
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY pop3_honeypot.py /opt/pop3_honeypot.py
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 110 995
+ENTRYPOINT ["/entrypoint.sh"]

templates/pop3/entrypoint.sh

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+#!/bin/bash
+set -e
+exec python3 /opt/pop3_honeypot.py

templates/pop3/pop3_honeypot.py

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+#!/usr/bin/env python3
+"""
+POP3 honeypot.
+Presents a convincing POP3 banner, collects USER/PASS credentials, then
+stalls with a generic error. Logs every interaction as JSON and forwards
+to LOG_TARGET if set.
+"""
+
+import asyncio
+import json
+import os
+import socket
+from datetime import datetime, timezone
+
+HONEYPOT_NAME = os.environ.get("HONEYPOT_NAME", "mailserver")
+LOG_TARGET = os.environ.get("LOG_TARGET", "")
+BANNER = f"+OK {HONEYPOT_NAME} POP3 server ready\r\n"
+
+
+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": "pop3",
+        "host": HONEYPOT_NAME,
+        "event": event_type,
+        **kwargs,
+    }
+    print(json.dumps(event), flush=True)
+    _forward(event)
+
+
+class POP3Protocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = None
+        self._user = None
+        self._buf = b""
+
+    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])
+        transport.write(BANNER.encode())
+
+    def data_received(self, data):
+        self._buf += data
+        while b"\n" in self._buf:
+            line, self._buf = self._buf.split(b"\n", 1)
+            self._handle_line(line.decode(errors="replace").strip())
+
+    def _handle_line(self, line: str):
+        upper = line.upper()
+        if upper.startswith("USER "):
+            self._user = line[5:].strip()
+            _log("user", src=self._peer[0], username=self._user)
+            self._transport.write(b"+OK\r\n")
+        elif upper.startswith("PASS "):
+            password = line[5:].strip()
+            _log("auth", src=self._peer[0], username=self._user, password=password)
+            self._transport.write(b"-ERR Authentication failed\r\n")
+        elif upper == "QUIT":
+            self._transport.write(b"+OK Bye\r\n")
+            self._transport.close()
+        elif upper == "CAPA":
+            self._transport.write(b"+OK Capability list follows\r\nUSER\r\n.\r\n")
+        else:
+            _log("command", src=self._peer[0], cmd=line[:128])
+            self._transport.write(b"-ERR Unknown command\r\n")
+
+    def connection_lost(self, exc):
+        _log("disconnect", src=self._peer[0] if self._peer else "?")
+
+
+async def main():
+    _log("startup", msg=f"POP3 honeypot starting as {HONEYPOT_NAME}")
+    loop = asyncio.get_running_loop()
+    server = await loop.create_server(POP3Protocol, "0.0.0.0", 110)
+    async with server:
+        await server.serve_forever()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())