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.
48 lines
1.6 KiB
Python
48 lines
1.6 KiB
Python
import os
|
|
from pathlib import Path
|
|
|
|
from decnet.services.base import BaseService
|
|
|
|
TEMPLATES_DIR = Path(__file__).parent.parent / "templates" / "smtp"
|
|
ARTIFACTS_ROOT = os.environ.get("DECNET_ARTIFACTS_ROOT", "/var/lib/decnet/artifacts")
|
|
# In-container path for full-message capture. /var/spool/mqueue is where
|
|
# sendmail historically parks unsent messages, so `ls` / `mount` inside the
|
|
# container looks benign to an attacker poking around.
|
|
_IN_CONTAINER_QUARANTINE = "/var/spool/mqueue"
|
|
|
|
|
|
class SMTPService(BaseService):
|
|
name = "smtp"
|
|
ports = [25, 587]
|
|
default_image = "build"
|
|
|
|
def compose_fragment(
|
|
self,
|
|
decky_name: str,
|
|
log_target: str | None = None,
|
|
service_cfg: dict | None = None,
|
|
) -> dict:
|
|
cfg = service_cfg or {}
|
|
quarantine_host = f"{ARTIFACTS_ROOT}/{decky_name}/smtp"
|
|
fragment: dict = {
|
|
"build": {"context": str(TEMPLATES_DIR)},
|
|
"container_name": f"{decky_name}-smtp",
|
|
"restart": "unless-stopped",
|
|
"cap_add": ["NET_BIND_SERVICE"],
|
|
"environment": {
|
|
"NODE_NAME": decky_name,
|
|
"SMTP_QUARANTINE_DIR": _IN_CONTAINER_QUARANTINE,
|
|
},
|
|
"volumes": [f"{quarantine_host}:{_IN_CONTAINER_QUARANTINE}:rw"],
|
|
}
|
|
if log_target:
|
|
fragment["environment"]["LOG_TARGET"] = log_target
|
|
if "banner" in cfg:
|
|
fragment["environment"]["SMTP_BANNER"] = cfg["banner"]
|
|
if "mta" in cfg:
|
|
fragment["environment"]["SMTP_MTA"] = cfg["mta"]
|
|
return fragment
|
|
|
|
def dockerfile_context(self) -> Path:
|
|
return TEMPLATES_DIR
|