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Linux-setcap命令(提权命令)

  • 2026-08-18 23:11:34
Linux-setcap命令(提权命令)
一、什么是setcap命令
Linux 内核 2.2 引入 Capability(能力集):把 root 的超级权限拆分成几十个独立、最小粒度的权限单元。setcap = set capabilities,作用:给二进制可执行文件绑定指定的权限能力,普通用户运行该程序时只获得分配的能力,不会拿到完整 root,遵循最小权限原则,大幅提升系统安全。
这篇文章主要介绍:使用该命令绑定1024以下特权端口,场景:普通用户启动nginx(nginx端口为80/443等),或其他java端口
二、语法
setcap [选项] <能力表达式> 目标文件 [多个文件]
2.1、选项
参数
作用
-r
删除文件所有已设置的 cap 能力(最常用)
2.2、能力表达式
能力名称
权限功能
典型使用场景
CAP_NET_BIND_SERVICE
绑定1024 以下特权端口 (80/443/22)
Nginx/Java/Go 程序普通用户监听 80、443
CAP_NET_ADMIN
修改网卡、路由、防火墙规则
网络管理程序、VPN
CAP_NET_RAW
创建原始套接字、收发 ICMP 包
ping、tcpdump、wireshark 抓包
CAP_CHOWN
任意修改文件属主、属组
文件同步、备份工具
2.3、集合标识
p (Permitted 允许集):进程被允许拥有该能力(前提,必须配置)e (Effective 生效集):能力实际立刻启用生效,没有 e 就算有 p 也无法使用权限i (Inheritable 可继承集):子进程执行 exec 时可以继承这份能力(守护进程、多进程程序使用)

+:追加能力;=:覆盖清空原有能力再写入;-:移除某个能力

=ep:清空原有 cap,赋予 允许 + 生效

+ep:在原有 cap 基础上,追加 允许 + 生效

三、实操命令

3.1、普通用户部署nginx

--在启动时报错,提示启动没有权限[nginx_oper@ceshiji2 ~]$ /home/nginx_oper/nginx-1.30.4/sbin/nginx nginx: [warn] the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /home/nginx_oper/nginx-1.30.4/conf/nginx.conf:2nginx: [emerg] bind() to 0.0.0.0:80 failed (13Permission denied)

3.2、给nginx二进制文件绑定特权端口80

--绑定特权端口80,setcap该命令必须使用root用户,如果没有root用户权限,可以使用sudo,不过前提是在/etc/sudoers有给nginx_oper用户配置,否则需要输入nginx_oper密码--切记后面跟的进程必须是绝对路径,不能是软连接或脚本[nginx_oper@ceshiji2 ~]$ sudo setcap cap_net_bind_service=+ep /home/nginx_oper/nginx-1.30.4/sbin/nginx --绑定后使用getcap进行查看,出现如下结果便是正常,getcap不需要root权限[nginx_oper@ceshiji2 ~]$ getcap /home/nginx_oper/nginx-1.30.4/sbin/nginx --输出结果:/home/nginx_oper/nginx-1.30.4/sbin/nginx = cap_net_bind_service+ep

3.3、使用nginx_oper普通用户启动nginx

--启动nginx[nginx_oper@ceshiji2 ~]$ /home/nginx_oper/nginx-1.30.4/sbin/nginx nginx: [warn] the "user" directive makes sense only if the master process runs with super-user privileges, ignored in /home/nginx_oper/nginx-1.30.4/conf/nginx.conf:2-- 查看进程,可以看见是用nginx_oper普通用户启动[nginx_oper@ceshiji2 ~]$ ps -eo user:15,uid,pid,cmd |grep nginxnginx_oper       1002   8401 nginx: master process /home/nginx_oper/nginx-1.30.4/sbin/nginxnginx_oper       1002   8402 nginx: worker processnginx_oper       1002   8403 nginx: worker process

3.4、取消文件cap能力

--使用-r参数取消nginx二进制文件cap能力[nginx_oper@ceshiji2 ~]$ sudo setcap -r /home/nginx_oper/nginx-1.30.4/sbin/nginx --查看cap能力,无输出就是没有[nginx_oper@ceshiji2 ~]$ getcap /home/nginx_oper/nginx-1.30.4/sbin/nginx
3.5、复制二进制文件带上cap能力
-需要注意普通用户复制时也需要sudosudo cp --preserve=all 原文件 目标文件--复制[nginx_oper@ceshiji2 ~]$ sudo cp --preserve=all /home/nginx_oper/nginx-1.30.4/sbin/nginx ./--查看没有问题[nginx_oper@ceshiji2 ~]$ ls -lth-rwxrwxr-x.  1 nginx_oper nginx_oper 7.4M Jul 31 23:31 nginxdrwxrwxr-x. 11 nginx_oper nginx_oper  151 Jul 31 22:59 nginx-1.30.4drwxrwxr-x.  3 nginx_oper nginx_oper   53 Jul 31 22:32 software[nginx_oper@ceshiji2 ~]$ getcap /home/nginx_oper/nginx/home/nginx_oper/nginx = cap_net_bind_service+ep
四、添加开机自启
--在原有的nginx自启文件中添加一行ExecStartPre=/usr/sbin/setcap 'cap_net_bind_service=+ep' /home/nginx_oper/nginx-1.30.4/sbin/nginx
五、踩坑点
5.1、文件变更

nginx版本升级或有新增模块,需要重新编译nginx二进制文件,编译后的nginx二进制文件替换原来二进制文件,此时cap能力会失效,从下图即可看出,具体原理在第6大点

5.2、systemd配置限制

若nginx.service 文件配置了CapabilityBoundingSet、mbientCapabilities会限制文件自带cap

5.3、cap只对原生二进制文件生效

如果你写 bash/python 脚本启动 nginx,给脚本 setcap 无效,cap 必须配置在最终执行的 nginx 本体二进制。
六、详解原理

1、root 权限调用 setcap 工具:setcap 修改文件扩展属性必须 root 执行,普通用户无权限修改文件 cap 标签。

2、内核写入扩展属性:内核在 nginx 文件的 inode 扩展属性中,写入 security.capability 字段,持久化保存在磁盘文件元数据(ext4/xfs 默认支持 xattr)。

3、写入的规则:只要任何用户执行这个 nginx 二进制文件,进程自动携带 cap_net_bind_service (允许 + 生效) 能力。

--大佬有建议请随时指点,必虚心采纳--

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  1. CONNECT:[ UseTime:0.000893s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001439s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000692s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.002383s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001362s ]
  6. SELECT * FROM `set` [ RunTime:0.000705s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002085s ]
  8. SELECT * FROM `article` WHERE `id` = 508102 LIMIT 1 [ RunTime:0.002248s ]
  9. UPDATE `article` SET `lasttime` = 1787294199 WHERE `id` = 508102 [ RunTime:0.002389s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000708s ]
  11. SELECT * FROM `article` WHERE `id` < 508102 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002012s ]
  12. SELECT * FROM `article` WHERE `id` > 508102 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.013617s ]
  13. SELECT * FROM `article` WHERE `id` < 508102 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.008420s ]
  14. SELECT * FROM `article` WHERE `id` < 508102 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.014432s ]
  15. SELECT * FROM `article` WHERE `id` < 508102 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.063962s ]
0.297489s