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
"""egress — an interpreter holding an outbound connection to a public IP.
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C2 beacons and exfil phone home. A scripting interpreter (bash/python/perl/nc…)
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with an established connection to a globally-routable address — that isn't in
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the operator's trust list — is worth a look.
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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 ..netutil import ip_in_cidrs, is_public_ip, split_host_port
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from ..system import SystemState
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def detect(state: SystemState, cfg: Config) -> Iterator[Alert]:
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for s in state.established_sockets():
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if s.comm not in cfg.interpreters:
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continue
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host, port = split_host_port(s.peer)
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if not is_public_ip(host):
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continue
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if ip_in_cidrs(host, cfg.egress_allow_cidrs):
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continue
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yield Alert(
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severity=Severity.HIGH,
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signature="egress",
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key=f"egr:{s.pid}:{host}",
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detail=(
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f"pid={s.pid} comm={s.comm} -> {host}:{port} "
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"(interpreter to public IP)"
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),
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pids=(s.pid,) if s.pid else (),
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)
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