586f74b929
Replace MIT with the full GNU GPLv3 text, update license metadata in pyproject.toml (+ trove classifiers) and PKGBUILD, and add SPDX-License-Identifier headers to all Python modules and shell scripts. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
47 lines
1.6 KiB
Python
47 lines
1.6 KiB
Python
# SPDX-License-Identifier: GPL-3.0-or-later
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"""ld_preload — userland rootkit / library-injection indicators.
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Two signatures:
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* ``/etc/ld.so.preload`` non-empty: injects into *every* dynamically-linked
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process — the classic system-wide rootkit hook.
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* a process whose ``LD_PRELOAD`` points into a writable/temp dir — per-process
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function hooking (hiding files/procs, stealing credentials).
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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 pathlib import Path
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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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_SUSPICIOUS_PREFIXES = ("/tmp/", "/dev/shm/", "/var/tmp/", "/run/user/", "./")
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def detect(state: SystemState, cfg: Config) -> Iterator[Alert]:
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preload = Path("/etc/ld.so.preload")
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try:
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contents = preload.read_text().strip() if preload.is_file() else ""
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except OSError:
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contents = ""
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if contents:
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yield Alert(
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severity=Severity.CRITICAL,
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signature="ld_preload",
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key="ldp:global",
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detail=f"/etc/ld.so.preload is non-empty: [{contents.replace(chr(10), ' ')}]",
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)
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for proc in state.processes:
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pre = proc.environ.get("LD_PRELOAD", "")
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if not pre:
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continue
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if pre.startswith(_SUSPICIOUS_PREFIXES):
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yield Alert(
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severity=Severity.CRITICAL,
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signature="ld_preload",
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key=f"ldp:{proc.pid}",
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detail=f"pid={proc.pid} comm={proc.comm} LD_PRELOAD=[{pre}]",
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pids=(proc.pid,),
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)
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