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>
36 lines
1.2 KiB
Python
36 lines
1.2 KiB
Python
# SPDX-License-Identifier: GPL-3.0-or-later
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"""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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