28d67a1360
Port the bash prototype to a structured, testable Python codebase while
preserving the same control loop and the seven detection signatures. The bash
implementation stays in src/ as the regression oracle.
Highlights:
- enodia_sentinel/ package (stdlib only — no runtime deps):
- detectors/ : one pure function per signature, detect(state, cfg)->Alerts
- system.py : SystemState — one cached /proc + ss snapshot per sweep,
fully injectable so detectors are unit-testable
- daemon.py : sweep loop, in-process cooldown dedup, threaded snapshot
capture, and a SUID filesystem scan moved OFF the loop
thread onto a slow background cadence
- snapshot.py: forensic text + JSON sidecar with per-signature IR guidance
- config.py : dataclass config via TOML + env overrides
- netutil.py : public-IP / CIDR logic via stdlib ipaddress
- tests/ : 25 stdlib-unittest cases (no root, no /proc, no ss needed)
- TOML config, launcher wrapper, Makefile (pip-free install), hardened
systemd unit (env-resolved ExecStart), updated PKGBUILD, rewritten README
Performance: per-sweep cost ~200 ms (shared cached state); the multi-second
SUID walk no longer blocks detection. scandir-based walk replaces os.walk.
Verified on Arch: all 7 detectors fire on red-team drills (reverse_shell,
ld_preload, deleted_exe, new_listener, new_suid confirmed live end-to-end),
no false positives on a clean sweep, 25/25 tests pass.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
42 lines
1.3 KiB
Python
42 lines
1.3 KiB
Python
"""persistence — modification of a watched persistence-relevant file.
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Persistence has to land somewhere that survives a reboot: cron, systemd units,
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``authorized_keys``, shell rc files. We watch a configurable set and alert on
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anything modified since the previous scan (``state.persist_since``).
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"""
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from __future__ import annotations
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import os
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from collections.abc import Iterator
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from ..alert import Alert, Severity
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from ..config import Config
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from ..system import SystemState
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def _iter_files(roots) -> Iterator[str]:
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for root in roots:
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if os.path.isdir(root):
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for dirpath, _dirs, files in os.walk(root, onerror=lambda e: None):
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for f in files:
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yield os.path.join(dirpath, f)
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elif os.path.lexists(root):
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yield root
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def detect(state: SystemState, cfg: Config) -> Iterator[Alert]:
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since = state.persist_since
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if since is None:
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return
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for path in _iter_files(cfg.watch_persistence):
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try:
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mtime = os.lstat(path).st_mtime
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except OSError:
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continue
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if mtime > since:
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yield Alert(
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severity=Severity.HIGH,
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signature="persistence",
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key=f"persist:{path}",
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detail=f"persistence file modified: {path}",
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)
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