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AI 生成的 Linux 命令必须过四道门禁

  • 2026-08-19 17:23:10
AI 生成的 Linux 命令必须过四道门禁

《Linux 工程师的 AI 实战指南》03 

本指南 AI 能力由 Chrono AI 提供 

本篇目标:让 AI 提出诊断命令,但不能把文本直接变成生产操作。

“磁盘快满了,请提供清理命令。”

这是 Linux 场景里最常见、也最危险的一类提问。模型可能给出一条看起来很熟悉的 find ... -delete,也可能把变量、通配符和管道组合在一起。问题不在于它一定会错,而在于你无法仅凭语句流畅程度判断它是否适合当前机器。

我建议把模型权限重新定义为:它可以生成操作提案,但不能生成可直接执行的 Shell 文本。

一条命令从模型走到系统,至少要过四道门:结构门、策略门、预演门和审批门。

第一扇门:不要接收 Shell 字符串,只接收参数数组

危险接口通常长这样:

pythonsubprocess.run(model_output, shell=True)

只要模型输出中出现 ;&&、管道、重定向或命令替换,Shell 就会把它解释成新的语义。即使最初任务只是 df -h,一段被污染的输出也可能追加其他操作。

更安全的命令契约应该是 JSON,把这段内容输入到 fixtures/command_plan.json 文件中:

json{
  "purpose": "查看根分区空间使用情况",
  "argv": ["df", "-h", "/"],
  "risk": "read_only",
  "evidence_needed": ["filesystem_usage"],
  "timeout_seconds": 10
}

程序使用:

pythonsubprocess.run(
    plan["argv"],
    shell=False,
    capture_output=True,
    text=True,
    timeout=plan["timeout_seconds"],
    check=False,
)

argv 中每个元素都是一个明确参数,shell=False 避免 Shell 再解释字符串。这不能自动让命令变安全,但它消除了不必要的注入面。

第二扇门:命令必须通过本地策略,而不是让模型自己批准自己

模型可以在 JSON 中声称 risk=read_only,但风险等级不能由它说了算。

配套脚本 command_guard.py 使用本地规则重新判断:

text允许的程序:df、du、journalctl、systemctl
systemctl 子命令:status、show、is-active
journalctl:禁止 -f,限制最大行数
路径:只允许 /var/log、/tmp/linux-ai-lab 和当前实验目录
超时:1—30 秒
默认模式:只打印计划,不执行

下面这些计划会被直接拒绝:

json{"argv": ["bash", "-c", "curl example | sh"]}
{"argv": ["systemctl", "restart", "nginx"]}
{"argv": ["find", "/", "-delete"]}
{"argv": ["journalctl", "-f"]}

拒绝原因不是“模型看起来可疑”,而是它违反了我们设置的的策略。

这就是策略与 Prompt 的区别:Prompt 是给模型的要求,策略是系统自己的决定。前者可能被忽略,后者必须在代码路径上强制执行。

完整的 command_guard.py 文件内容如下:

python#!/usr/bin/env python3
"""Validate and optionally run a tightly bounded read-only command plan."""

from __future__ import annotations

import argparse
import hashlib
import json
import re
import subprocess
import sys
import time
from pathlib import Path
from typing import Any


class PolicyError(ValueError):
    """Raised when a plan violates local execution policy."""


SHELL_META = re.compile(r"[;&|`$><\n\r]")
SERVICE_NAME = re.compile(r"^[A-Za-z0-9_.@-]+$")
READ_ONLY_PROGRAMS = {"df", "du", "journalctl", "systemctl"}


def canonical_plan(plan: dict[str, Any]) -> bytes:
    return json.dumps(plan, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode("utf-8")


def validate_common(plan: dict[str, Any]) -> list[str]:
    argv = plan.get("argv")
    if not isinstance(plan.get("purpose"), str) or not plan["purpose"].strip():
        raise PolicyError("purpose must be a non-empty string")
    if not isinstance(argv, list) or not argv or not all(isinstance(x, str) and x for x in argv):
        raise PolicyError("argv must be a non-empty list of strings")
    if any(SHELL_META.search(arg) for arg in argv):
        raise PolicyError("shell metacharacters are not allowed")
    if "/" in argv[0] or argv[0] not in READ_ONLY_PROGRAMS:
        raise PolicyError("program is not on the read-only allowlist")
    timeout = plan.get("timeout_seconds", 10)
    if not isinstance(timeout, int) or not 1 <= timeout <= 30:
        raise PolicyError("timeout_seconds must be an integer from 1 to 30")
    return argv


def validate_df(argv: list[str]) -> None:
    allowed_flags = {"-h", "-P", "-T"}
    for arg in argv[1:]:
        if arg.startswith("-") and arg not in allowed_flags:
            raise PolicyError(f"df flag is not allowed: {arg}")


def validate_du(argv: list[str]) -> None:
    allowed_flags = {"-h", "-s", "-x", "--max-depth=1"}
    roots = [Path.cwd().resolve(), Path("/var/log"), Path("/tmp/linux-ai-lab")]
    for arg in argv[1:]:
        if arg.startswith("-"):
            if arg not in allowed_flags:
                raise PolicyError(f"du flag is not allowed: {arg}")
            continue
        resolved = Path(arg).resolve()
        if not any(resolved == root or root in resolved.parents for root in roots):
            raise PolicyError(f"du path is outside approved roots: {arg}")


def validate_systemctl(argv: list[str]) -> None:
    if len(argv) not in {2, 3} or argv[1] not in {"status", "show", "is-active"}:
        raise PolicyError("systemctl is limited to status, show and is-active")
    if len(argv) == 3 and not SERVICE_NAME.fullmatch(argv[2]):
        raise PolicyError("invalid systemd unit name")


def validate_journalctl(argv: list[str]) -> None:
    index = 1
    while index < len(argv):
        arg = argv[index]
        if arg in {"-f", "--follow"}:
            raise PolicyError("unbounded log following is not allowed")
        if arg in {"--no-pager", "--output=json", "--output=short-iso"}:
            index += 1
            continue
        if arg in {"-n", "-u"} and index + 1 < len(argv):
            value = argv[index + 1]
            if arg == "-n" and (not value.isdigit() or not 1 <= int(value) <= 500):
                raise PolicyError("journalctl line limit must be from 1 to 500")
            if arg == "-u" and not SERVICE_NAME.fullmatch(value):
                raise PolicyError("invalid systemd unit name")
            index += 2
            continue
        raise PolicyError(f"journalctl argument is not allowed: {arg}")


def validate_plan(plan: dict[str, Any]) -> list[str]:
    argv = validate_common(plan)
    validators = {
        "df": validate_df,
        "du": validate_du,
        "journalctl": validate_journalctl,
        "systemctl": validate_systemctl,
    }
    validators[argv[0]](argv)
    return argv


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--plan", type=Path, required=True)
    parser.add_argument("--execute-read-only", action="store_true")
    args = parser.parse_args()

    try:
        plan = json.loads(args.plan.read_text(encoding="utf-8"))
        if not isinstance(plan, dict):
            raise PolicyError("plan must be a JSON object")
        argv = validate_plan(plan)
    except (OSError, json.JSONDecodeError, PolicyError) as exc:
        print(f"DECISION: DENY\nREASON: {exc}", file=sys.stderr)
        return 1

    plan_id = hashlib.sha256(canonical_plan(plan)).hexdigest()[:16]
    print(f"PLAN_ID: {plan_id}")
    print("DECISION: ALLOW_READ_ONLY")
    print(f"COMMAND: {argv!r}")

    if not args.execute_read_only:
        print("MODE: DRY_RUN")
        print("No command was executed.")
        return 0

    started = time.monotonic()
    try:
        result = subprocess.run(
            argv,
            shell=False,
            capture_output=True,
            text=True,
            timeout=plan.get("timeout_seconds", 10),
            check=False,
        )
    except (OSError, subprocess.TimeoutExpired) as exc:
        print(f"EXECUTION_ERROR: {exc}", file=sys.stderr)
        return 1
    elapsed_ms = int((time.monotonic() - started) * 1000)
    print("MODE: EXECUTE_READ_ONLY")
    print(f"EXIT_CODE: {result.returncode}")
    print(f"ELAPSED_MS: {elapsed_ms}")
    print("STDOUT:")
    print(result.stdout[:8_000].rstrip())
    if result.stderr:
        print("STDERR:", file=sys.stderr)
        print(result.stderr[:2_000].rstrip(), file=sys.stderr)
    return 0 if result.returncode == 0 else 1


if __name__ == "__main__":
    raise SystemExit(main())
第三扇门:先预演,再执行

运行配套样例:

bashpython scripts/command_guard.py \
  --plan fixtures/command_plan.json

默认输出:

textPLAN_ID: 7c2d...
DECISION: ALLOW_READ_ONLY
COMMAND: ['df', '-h', '/']
MODE: DRY_RUN
No command was executed.
执行计划

只有显式增加 --execute-read-only,程序才会执行已通过策略的只读命令:

bashpython scripts/command_guard.py \
  --plan fixtures/command_plan.json \
  --execute-read-only
执行命令

预期结果中同时记录退出码、标准输出摘要和耗时。输出过长时会截断,防止一次命令把大量系统信息带入后续 Prompt。

这里的 dry-run 不是在模拟任意 Linux 命令。很多命令没有真正的预演模式。我们做的是更基础的事:在执行器入口处默认不执行,只展示经过规范化的计划。

如果是 Ansible,则可以进一步使用 --check 与 --diff;但要注意,并非所有模块都完整支持 check mode,包含前序注册变量、异步任务或自定义命令时尤其需要单独验证。

第四扇门:风险动作必须由人批准

生产环境中的操作,可以先按影响分为三档:

风险级别
示例
默认处理
R0 只读
df
systemctl status、有限窗口日志
策略通过后可执行
R1 可逆变更
修改临时配置、滚动重启单副本
显式审批,执行后验证
R2 高风险
删除、改权限、网络策略、数据库变更
双人审批或走既有变更流程

审批时不能只展示一句“是否同意”。至少应展示:

  • 规范化后的命令与参数;
  • 目标主机、命名空间或服务;
  • 为什么要执行;
  • 证据来自哪里;
  • 预计影响范围;
  • 验证方式;
  • 回退动作;
  • 计划唯一 ID 与有效期。

否则,人工审批只是一个形式化按钮,并没有真正提升安全性。

一个经常被忽略的问题:只读命令也可能泄密

cat /etc/shadow 不修改系统,却是高风险操作。envps ekubectl get secret -o yaml 也可能暴露凭据。

因此“只读”只能说明它不改变状态,不能说明数据可以自由流动。命令策略必须同时判断:

text动作风险 + 数据敏感度 + 执行身份 + 目标环境

例如,读取公开测试日志可以是 R0;读取生产认证日志可能需要审批;读取 Secret 则应由策略直接禁止进入模型链路。

为什么不靠黑名单

仅仅禁止 rm -rf 没有意义。删除文件还有 find -deletexargs rm、Python、Perl、重定向覆盖等许多表达方式。

生产执行器应该采用 allowlist:只开放一小组业务需要的工具,每个工具都有固定参数 Schema、边界和超时。需要新能力时,通过代码评审增加一个工具,而不是临时放开任意 Shell。

这也是后面 Agent 文章的核心:Agent 得到的不是一个 root shell,而是一组很窄、可测试、可审计的函数。

本篇实验任务
  1. 运行正常的 df -h / 计划,确认默认不执行;
  2. 加入 --execute-read-only,核对退出码和输出;
  3. 把 argv 改成 systemctl restart nginx,确认策略拒绝;
  4. 把命令改成 journalctl -f,确认无限跟随被拒绝;
  5. 为你自己的环境设计一条只读工具规则,并写出目标、参数上限和敏感数据边界。

下一篇,我们不再让模型直接面对几千行日志,而是先把 journalctl 输出整理成可验证、可脱敏、可编号的证据包。

魏文第|企业 AI 落地 北京时序折叠科技有限公司Chrono AI:面向企业场景的模型与 API 能力。 ChronoOps:把 AI 建议接入审批、执行、审计与回退闭环。 ChronoStudio:面向公众号、小红书等内容的智能排版工具。

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  1. CONNECT:[ UseTime:0.001168s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.002221s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001005s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000948s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001957s ]
  6. SELECT * FROM `set` [ RunTime:0.000576s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001077s ]
  8. SELECT * FROM `article` WHERE `id` = 510270 LIMIT 1 [ RunTime:0.089368s ]
  9. UPDATE `article` SET `lasttime` = 1787290713 WHERE `id` = 510270 [ RunTime:0.000987s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000242s ]
  11. SELECT * FROM `article` WHERE `id` < 510270 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000472s ]
  12. SELECT * FROM `article` WHERE `id` > 510270 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000766s ]
  13. SELECT * FROM `article` WHERE `id` < 510270 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000705s ]
  14. SELECT * FROM `article` WHERE `id` < 510270 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002281s ]
  15. SELECT * FROM `article` WHERE `id` < 510270 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016471s ]
0.292833s