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>
60 lines
2.8 KiB
TOML
60 lines
2.8 KiB
TOML
# Enodia Sentinel configuration (TOML).
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# Read at startup from /etc/enodia-sentinel.toml (or $ENODIA_CONFIG).
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# Restart after editing: sudo systemctl restart enodia-sentinel.service
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#
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# Every key is optional; omitted keys keep their built-in default.
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# --- timing --------------------------------------------------------------
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sample_interval = 4.0 # seconds between detector sweeps
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cooldown = 60 # min seconds before re-alerting the same signature
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baseline_grace = 10 # seconds after start before new-listener/suid arm
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suid_refresh = 3600 # seconds between SUID baseline refreshes
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suid_scan_interval = 60 # seconds between (backgrounded) SUID filesystem scans
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# --- detectors (omit one to disable it) ----------------------------------
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detectors = [
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"reverse_shell", "ld_preload", "deleted_exe",
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"new_listener", "new_suid", "persistence", "egress",
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]
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# --- tuning --------------------------------------------------------------
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# Process names treated as "interpreters" for reverse-shell / egress checks.
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interpreters = [
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"bash", "sh", "dash", "zsh", "ksh", "ash", "nc", "ncat", "netcat",
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"socat", "telnet", "python", "python2", "python3", "perl", "ruby",
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"php", "lua", "awk",
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]
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# Trusted public CIDRs that should NOT trip the egress detector
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# (your VPS, VPN exit, monitoring endpoints, …).
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egress_allow_cidrs = []
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# Listener ports that never alert even if they appear after baseline.
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listener_allow_ports = []
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# Dirs where any SUID binary is treated as CRITICAL (attacker-writable).
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suid_hot_dirs = ["/tmp", "/dev/shm", "/var/tmp", "/home", "/run/user"]
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# Writable dirs always scanned for SUID even if on a separate filesystem
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# (a tmpfs /tmp would otherwise be skipped by the on-device walk).
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suid_scan_extra_dirs = ["/tmp", "/dev/shm", "/var/tmp", "/run/user"]
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# Persistence files/dirs watched for modification.
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watch_persistence = [
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"/etc/cron.d", "/etc/crontab", "/etc/cron.daily", "/etc/cron.hourly",
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"/etc/cron.weekly", "/var/spool/cron", "/etc/systemd/system",
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"/etc/ld.so.preload", "/etc/passwd", "/etc/sudoers", "/etc/sudoers.d",
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"/root/.ssh/authorized_keys", "/root/.bashrc", "/root/.profile",
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]
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# --- eBPF on-ramp --------------------------------------------------------
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# Add a 3s bpftrace execve trace to each snapshot (requires the bpftrace pkg).
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capture_execve_bpftrace = false
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# --- retention -----------------------------------------------------------
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max_snapshots = 300 # auto-delete oldest beyond this count (0 = no cap)
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max_snapshot_age_days = 60 # auto-delete older than this (0 = no age cap)
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# --- notifications -------------------------------------------------------
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notify_users = [] # e.g. ["luna"] — desktop notify-send on alert
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notify_urgency = "critical" # low / normal / critical
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