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Re-architect Sentinel as a zero-dependency Python package

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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>
This commit is contained in:
Luna 2026-05-31 01:50:50 -07:00
parent 45f8acb24a
commit 28d67a1360
28 changed files with 1783 additions and 133 deletions
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36
Makefile
View file

@ -1,30 +1,36 @@
PREFIX ?= /usr/local
BINDIR := $(PREFIX)/bin
LIBDIR := $(PREFIX)/lib/enodia-sentinel
SYSTEMDDIR := /etc/systemd/system
CONFDIR := /etc
LOGDIR := /var/log/enodia-sentinel
.PHONY: install uninstall enable disable status logs check baseline drill clean
.PHONY: install uninstall enable disable status logs check baseline drill test clean
# Installs the stdlib-only Python package as a plain directory + launcher
# wrapper (no pip, no virtualenv, no site-packages). Zero runtime deps.
install:
install -Dm755 src/sentinel.sh $(DESTDIR)$(BINDIR)/sentinel.sh
install -d $(DESTDIR)$(LIBDIR)
cp -r enodia_sentinel $(DESTDIR)$(LIBDIR)/
install -Dm755 packaging/enodia-sentinel.wrapper $(DESTDIR)$(BINDIR)/enodia-sentinel
install -Dm755 src/sentinel-redteam $(DESTDIR)$(BINDIR)/sentinel-redteam
install -Dm644 systemd/enodia-sentinel.service $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel.service
@if [ ! -e "$(DESTDIR)$(CONFDIR)/enodia-sentinel.conf" ]; then \
install -Dm644 config/enodia-sentinel.conf $(DESTDIR)$(CONFDIR)/enodia-sentinel.conf; \
echo "Installed default config at $(CONFDIR)/enodia-sentinel.conf"; \
@if [ ! -e "$(DESTDIR)$(CONFDIR)/enodia-sentinel.toml" ]; then \
install -Dm644 config/enodia-sentinel.toml $(DESTDIR)$(CONFDIR)/enodia-sentinel.toml; \
echo "Installed default config at $(CONFDIR)/enodia-sentinel.toml"; \
else \
install -Dm644 config/enodia-sentinel.conf $(DESTDIR)$(CONFDIR)/enodia-sentinel.conf.new; \
echo "Existing config preserved; new template at $(CONFDIR)/enodia-sentinel.conf.new"; \
install -Dm644 config/enodia-sentinel.toml $(DESTDIR)$(CONFDIR)/enodia-sentinel.toml.new; \
echo "Existing config preserved; new template at $(CONFDIR)/enodia-sentinel.toml.new"; \
fi
install -dm750 $(DESTDIR)$(LOGDIR)
@echo "Installed. Run 'sudo make enable' to start the service."
uninstall:
rm -f $(DESTDIR)$(BINDIR)/sentinel.sh
rm -rf $(DESTDIR)$(LIBDIR)
rm -f $(DESTDIR)$(BINDIR)/enodia-sentinel
rm -f $(DESTDIR)$(BINDIR)/sentinel-redteam
rm -f $(DESTDIR)$(SYSTEMDDIR)/enodia-sentinel.service
rm -f $(DESTDIR)$(CONFDIR)/enodia-sentinel.conf.new
rm -f $(DESTDIR)$(CONFDIR)/enodia-sentinel.toml.new
@echo "Uninstalled. Config and logs preserved."
enable:
@ -40,14 +46,18 @@ status:
logs:
journalctl -u enodia-sentinel.service -f
# Dev targets — run from the repo without installing.
test:
python3 -m unittest discover -s tests -v
check:
sentinel.sh --check
python3 -m enodia_sentinel.cli check
baseline:
sentinel.sh --baseline
python3 -m enodia_sentinel.cli baseline
drill:
sentinel-redteam
./src/sentinel-redteam
clean:
@echo "Nothing to clean (no build artifacts)."
find . -type d -name __pycache__ -prune -exec rm -rf {} +