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Linux | 权限管理体系

  • 2026-06-30 12:05:11
Linux | 权限管理体系

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Linux系统

权限管理体系

一、权限位解析示例

-rw-r--r--. 1 root root 1417 10-30 18:37 /etc/passwd

第1个字符:表示普通文件

后面9个字符:rw- r-- r--

rw-:属主有读、写权限

r--:属组有读权限

r--:其他人有读权限

二、权限的数字表示法

(八进制)

三、修改权限命令

1. chmod - 修改权限

(1)符号方式示例:

属主添加执行权限

chmod u+x script.sh 

属组移除写权限

chmod g-w file.txt 

其他人设为只读

chmod o=r file.txt  

所有人添加读和执行

chmod a+rx file.sh  

(2)数字方式示例:

chmod 755 script.sh      # rwxr-xr-x

chmod 644 file.txt       # rw-r--r--

chmod 600 secret.txt     # rw-------

2. 创建时直接设置权限

mkdir -m 755 newdir  

复制并设置权限

install -m 644 file.txt /dest/ 

四、umask(权限掩码)

umask 决定新建文件和目录的默认权限。

umask常见值

umask          # 查看当前umask

umask 027   # 设置umask为027

umask -S     # 符号方式显示(如u=rwx,g=rx,o=)

五、属主属组管理(chown/chgrp)

chown - 修改属主和属组

chown user file     # 只改属主

chown :group file      # 只改属组

chown user:group file      # 同时修改

chown -R user:group dir/     # 递归修改

chgrp - 修改属组

chgrp group file       # 修改属组

chgrp -R group dir/        # 递归修改

示例:

groupadd tmooc

useradd lisi

chown lisi:tmooc /ns15    # 同时修改属主和属组

chown zhangsan /ns15   # 只改属主

chown :root /ns15       # 只改属组

六、特殊权限(SUID/SGID/Sticky Bit)

1. SUID(Set User ID)- 4xxx

查看passwd的SUID

ls -l /usr/bin/passwd   # -rwsr-xr-x

设置SUID

chmod u+s /opt/myapp

chmod 4755 /opt/myapp

2. SGID(Set Group ID)- 2xxx

设置目录SGID

mkdir /shared

chgrp develop /shared

chmod g+s /shared      # 目录权限变为 drwxr-sr-x

此后在目录中新建文件,属组自动为develop

3. Sticky Bit(粘滞位)- 1xxx

查看/tmp的粘滞位

ls -ld /tmp            # drwxrwxrwt

设置粘滞位

chmod o+t /shared

chmod 1777 /shared

特殊权限组合示例

SUID(4)+SGID(2)=6,权限755

chmod 6755 file  

Sticky(1)+755   

chmod 1755 dir       

七、ACL(Access Control List)策略

为什么需要ACL?

传统权限只有“属主、属组、其他人”三类,无法为个别用户/组单独设置权限。

ACL常用命令

ACL示例

为用户zhangsan单独设置权限

setfacl -m u:zhangsan:rw file.txt

查看ACL

getfacl file.txt

为目录设置默认ACL(新建文件自动继承)

setfacl -m d:u:zhangsan:rw dir/

递归设置ACL

setfacl -R -m u:zhangsan:rw dir/

ACL优先级规则

属主 > ACL用户 > 属组/ACL组 > 其他人

八、权限判断流程

Linux判断用户对文件的权限顺序:

九、常见问题与注意事项

十、快速参考卡片

查看权限

ls -l file

stat file

修改权限

chmod 755 file

chmod u+x,g-w,o=r file

chmod -R 755 dir/

修改属主属组

chown user:group file

chgrp group file

特殊权限

chmod u+s file      # SUID

chmod g+s dir       # SGID

chmod o+t dir       # Sticky

ACL管理

setfacl -m u:user:rwx file

getfacl file

umask

umask 027

umask -S

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  1. CONNECT:[ UseTime:0.000454s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001252s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000296s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000492s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000493s ]
  8. SELECT * FROM `article` WHERE `id` = 493360 LIMIT 1 [ RunTime:0.001068s ]
  9. UPDATE `article` SET `lasttime` = 1783067941 WHERE `id` = 493360 [ RunTime:0.000885s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 67 LIMIT 1 [ RunTime:0.000243s ]
  11. SELECT * FROM `article` WHERE `id` < 493360 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000437s ]
  12. SELECT * FROM `article` WHERE `id` > 493360 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001329s ]
  13. SELECT * FROM `article` WHERE `id` < 493360 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000948s ]
  14. SELECT * FROM `article` WHERE `id` < 493360 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001094s ]
  15. SELECT * FROM `article` WHERE `id` < 493360 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003515s ]
0.083572s