anti
c50448995b
SMTP template now writes each accepted DATA body as a .eml file into a
bind-mounted per-decky quarantine dir and emits a `message_stored` log
with sha256, size, decoded headers, and an attachment manifest
(filename + sha256 + size + content-type). Attachment hashing uses the
*decoded* payload so operators can match against VT / MalwareBazaar
directly. Body accumulator is capped at SMTP_MAX_BODY_BYTES (default
10 MB, matching the EHLO SIZE advert) so a streaming client can't OOM
the container.
The existing /api/v1/artifacts/{decky}/{stored_as} endpoint now takes
an optional ?service= query param (defaults to ssh for back-compat)
and can serve .eml files out of the smtp subdir. Forensic metadata
rides the normal log pipeline, same as SSH file_captured.
51 lines
1.8 KiB
Python
51 lines
1.8 KiB
Python
import os
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from pathlib import Path
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from decnet.services.base import BaseService
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# Reuses the same template as the smtp service — only difference is
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# SMTP_OPEN_RELAY=1 in the environment, which enables the open relay persona.
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_TEMPLATES_DIR = Path(__file__).parent.parent / "templates" / "smtp"
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ARTIFACTS_ROOT = os.environ.get("DECNET_ARTIFACTS_ROOT", "/var/lib/decnet/artifacts")
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# See decnet/services/smtp.py — benign-looking in-container quarantine path.
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_IN_CONTAINER_QUARANTINE = "/var/spool/mqueue"
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class SMTPRelayService(BaseService):
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"""SMTP open relay bait — accepts any RCPT TO and delivers messages."""
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name = "smtp_relay"
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ports = [25, 587]
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default_image = "build"
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def compose_fragment(
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self,
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decky_name: str,
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log_target: str | None = None,
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service_cfg: dict | None = None,
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) -> dict:
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cfg = service_cfg or {}
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quarantine_host = f"{ARTIFACTS_ROOT}/{decky_name}/smtp"
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fragment: dict = {
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"build": {"context": str(_TEMPLATES_DIR)},
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"container_name": f"{decky_name}-smtp_relay",
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"restart": "unless-stopped",
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"cap_add": ["NET_BIND_SERVICE"],
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"environment": {
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"NODE_NAME": decky_name,
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"SMTP_OPEN_RELAY": "1",
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"SMTP_QUARANTINE_DIR": _IN_CONTAINER_QUARANTINE,
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},
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"volumes": [f"{quarantine_host}:{_IN_CONTAINER_QUARANTINE}:rw"],
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}
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if log_target:
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fragment["environment"]["LOG_TARGET"] = log_target
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if "banner" in cfg:
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fragment["environment"]["SMTP_BANNER"] = cfg["banner"]
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if "mta" in cfg:
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fragment["environment"]["SMTP_MTA"] = cfg["mta"]
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return fragment
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def dockerfile_context(self) -> Path:
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return _TEMPLATES_DIR
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