Replace dead upstream images with custom build services; add retry logic

dtagdevsec/mailoney and dtagdevsec/elasticpot are unavailable on Docker Hub
("manifest unknown"), causing the entire deployment to abort and cascade-
interrupt all other image pulls.

- Convert smtp and elasticsearch to build services with custom Python
  honeypots: smtp emulates Postfix ESMTP (EHLO/AUTH/MAIL/RCPT logging),
  elasticsearch emulates ES 7.17 HTTP API (logs recon probes like /_cat/,
  /_cluster/, /_nodes/, /_security/)
- Both use ARG BASE_IMAGE so they participate in per-decky distro variation
- Add _compose_with_retry() to deployer: 3 attempts with exponential backoff
  (5s → 10s → 20s) for transient network failures; permanent errors
  ("manifest unknown", "pull access denied") are detected and not retried
- Update test_services.py and test_composer.py: smtp/elasticsearch moved
  from UPSTREAM_SERVICES to BUILD_SERVICES (314 tests passing)

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

templates/smtp/Dockerfile

@@ -0,0 +1,13 @@
+ARG BASE_IMAGE=debian:bookworm-slim
+FROM ${BASE_IMAGE}
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    python3 \
+    && rm -rf /var/lib/apt/lists/*
+
+COPY smtp_honeypot.py /opt/smtp_honeypot.py
+COPY entrypoint.sh /entrypoint.sh
+RUN chmod +x /entrypoint.sh
+
+EXPOSE 25 587
+ENTRYPOINT ["/entrypoint.sh"]

templates/smtp/entrypoint.sh

@@ -0,0 +1,3 @@
+#!/bin/bash
+set -e
+exec python3 /opt/smtp_honeypot.py

templates/smtp/smtp_honeypot.py

@@ -0,0 +1,117 @@
+#!/usr/bin/env python3
+"""
+SMTP honeypot — emulates a realistic ESMTP server (Postfix-style).
+Logs EHLO/AUTH/MAIL FROM/RCPT TO attempts as JSON, then denies auth.
+"""
+
+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", "")
+
+
+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": "smtp",
+        "host": HONEYPOT_NAME,
+        "event": event_type,
+        **kwargs,
+    }
+    print(json.dumps(event), flush=True)
+    _forward(event)
+
+
+class SMTPProtocol(asyncio.Protocol):
+    def __init__(self):
+        self._transport = None
+        self._peer = ("?", 0)
+        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(f"220 {HONEYPOT_NAME} ESMTP Postfix (Debian/GNU)\r\n".encode())
+
+    def data_received(self, data):
+        self._buf += data
+        while b"\r\n" in self._buf:
+            line, self._buf = self._buf.split(b"\r\n", 1)
+            self._handle_line(line.decode(errors="replace").strip())
+
+    def _handle_line(self, line: str) -> None:
+        cmd = line.split()[0].upper() if line.split() else ""
+
+        if cmd in ("EHLO", "HELO"):
+            domain = line.split(None, 1)[1] if " " in line else ""
+            _log("ehlo", src=self._peer[0], domain=domain)
+            self._transport.write(
+                f"250-{HONEYPOT_NAME}\r\n"
+                f"250-PIPELINING\r\n"
+                f"250-SIZE 10240000\r\n"
+                f"250-VRFY\r\n"
+                f"250-ETRN\r\n"
+                f"250-AUTH PLAIN LOGIN\r\n"
+                f"250-ENHANCEDSTATUSCODES\r\n"
+                f"250-8BITMIME\r\n"
+                f"250 DSN\r\n".encode()
+            )
+        elif cmd == "AUTH":
+            _log("auth_attempt", src=self._peer[0], command=line)
+            self._transport.write(b"535 5.7.8 Error: authentication failed: UGFzc3dvcmQ6\r\n")
+            self._transport.close()
+        elif cmd == "MAIL":
+            _log("mail_from", src=self._peer[0], value=line)
+            self._transport.write(b"250 2.1.0 Ok\r\n")
+        elif cmd == "RCPT":
+            _log("rcpt_to", src=self._peer[0], value=line)
+            self._transport.write(b"250 2.1.5 Ok\r\n")
+        elif cmd == "DATA":
+            self._transport.write(b"354 End data with <CR><LF>.<CR><LF>\r\n")
+        elif cmd == "VRFY":
+            _log("vrfy", src=self._peer[0], value=line)
+            self._transport.write(b"252 2.0.0 Cannot VRFY user\r\n")
+        elif cmd == "QUIT":
+            self._transport.write(b"221 2.0.0 Bye\r\n")
+            self._transport.close()
+        elif cmd == "NOOP":
+            self._transport.write(b"250 2.0.0 Ok\r\n")
+        elif cmd == "RSET":
+            self._transport.write(b"250 2.0.0 Ok\r\n")
+        elif cmd == "STARTTLS":
+            # Pretend we don't support upgrading mid-session
+            self._transport.write(b"454 4.7.0 TLS not available due to local problem\r\n")
+        else:
+            _log("unknown_command", src=self._peer[0], command=line)
+            self._transport.write(b"502 5.5.2 Error: command not recognized\r\n")
+
+    def connection_lost(self, exc):
+        _log("disconnect", src=self._peer[0] if self._peer else "?")
+
+
+async def main():
+    _log("startup", msg=f"SMTP honeypot starting as {HONEYPOT_NAME}")
+    loop = asyncio.get_running_loop()
+    server = await loop.create_server(SMTPProtocol, "0.0.0.0", 25)
+    async with server:
+        await server.serve_forever()
+
+
+if __name__ == "__main__":
+    asyncio.run(main())