Both zero-dependency (stdlib http.server + urllib), consistent with the
project's no-dependency-tree stance for a security daemon.
Web dashboard (enodia_sentinel/web.py + static/dashboard.html):
- read-only JSON API over the log dir: /api/status, /api/alerts,
/api/alerts/<id>, /api/events
- bearer-token auth (constant-time; header or ?token=), required on non-
loopback binds, auto-generated + persisted (0600) when unset
- binds the host's Tailscale IP by default (auto-detected), reachable from the
tailnet but not the LAN/internet
- self-contained dark SPA: severity cards, live alert list, full snapshot
viewer; 10s auto-refresh
- path-traversal-safe alert lookup; `enodia-sentinel web` subcommand; daemon
now writes a pidfile so the dashboard can show live status
- hardened enodia-sentinel-web.service (read-only, no caps)
Phone push (enodia_sentinel/notify/):
- pluggable backends — ntfy, Pushover, generic webhook — each separating a pure
build() (unit-tested, no network) from send()
- a backend turns on when its config keys are set; pushes gated by
notify_min_severity; severity → per-service priority/tags
- fired from snapshot.capture on worker threads, errors swallowed
- desktop notify-send retained
Tests: +16 (9 web incl. a real-server 401/200 auth test, 7 notify request-build
cases). 55/55 pass. Live end-to-end verified: daemon → alert → API → page.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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>
Poll-based host intrusion-detection daemon modeled on freeze-watcher's
sample→trigger→snapshot→classify loop, with security signatures instead
of performance ones:
- reverse_shell (interpreter with a network socket on stdio)
- ld_preload (/etc/ld.so.preload or LD_PRELOAD in writable dirs)
- deleted_exe (process running from a deleted/memfd binary)
- new_listener (listening port absent from startup baseline)
- new_suid (new SUID/SGID binary; critical in writable dirs)
- persistence (cron/systemd/authorized_keys/rc-file changes)
- suspicious_egress (interpreter holding an outbound public connection)
Each capture writes a forensic snapshot with per-signature incident-
response guidance. Includes a safe, self-cleaning red-team harness
(sentinel-redteam), hardened systemd unit, config, Makefile, and Arch
packaging.
Tested on Arch: detectors fire on drills, no false positives on a clean
sweep, sweep cost optimized from ~15s to ~1s via batched syscalls and a
gated filesystem-wide SUID scan.
This bash implementation is retained as the regression oracle for the
forthcoming Python rewrite.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
