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>
35 lines
1.2 KiB
Python
35 lines
1.2 KiB
Python
"""new_suid — a SUID/SGID binary that wasn't in the baseline.
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A new setuid binary is a privilege-escalation persistence trick; one in a
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world-writable dir (``/tmp``, ``/home`` …) is almost never legitimate, so it is
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escalated to CRITICAL. The filesystem walk is expensive, so the daemon only
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populates ``state.suid_binaries`` on its slow scan cadence — when it's absent
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this detector is a no-op.
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"""
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from __future__ import annotations
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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 detect(state: SystemState, cfg: Config) -> Iterator[Alert]:
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if state.suid_binaries is None or state.suid_baseline is None:
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return
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for path in state.suid_binaries:
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if path in state.suid_baseline:
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continue
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hot = any(
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path.startswith(d.rstrip("/") + "/") for d in cfg.suid_hot_dirs
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)
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yield Alert(
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severity=Severity.CRITICAL if hot else Severity.HIGH,
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signature="new_suid",
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key=f"suid:{path}",
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detail=(
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("SUID/SGID binary in writable dir: " if hot
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else "new SUID/SGID binary: ") + path
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),
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)
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