In-depth analysis of the usage of semanage command-LINUX-php.cn

In-depth analysis of the usage of semanage command

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Release： 2024-01-02 11:48:27

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Introduction

The semanage command is used to query and modify the security context of the SELinux default directory. SELinux policy and rule management related commands: seinfo command, sesearch command, getsebool command, setsebool command, semanage command. Let us explain in detail how to use the chcon command.

grammar

semanage {login|user|port|interface|fcontext|translation} -l 
semanage fcontext -{a|d|m} [-frst] file_spec

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Options

--l：查询。 
fcontext：主要用在安全上下文方面。 
-a：增加，你可以增加一些目录的默认安全上下文类型设置。 
-m：修改。 
-d：删除。

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Example Check the default security settings of /var/www/html:

semanage fcontext -l 
SELinux fcontext type Context 
....(前面省略).... /var/www(/.*)? all files system_u:object_r:httpd_sys_content_t:s0 ....(後面省略)....

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As shown in the above example, we can query the security article of each directory! The directory setting can use regular expressions to specify a range. So what if we want to increase the security of some custom directories? For example, when I want the color setting /srv/samba to become the type of public_content_t inline code, how should I set it?

Use the semanage command to set the default security of the /srv/samba directory. This article is public_content_t:

chcon -t public_content_rw_t /var/ftp/incoming

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Allow users to HHTP access their home directories. This setting is limited to the user's home directory homepage:

mkdir /srv/samba 
ll -Zd /srv/samba 
drwxr-xr-x root root root:object_r:var_t /srv/samba

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As shown above, the default situation should be var_tthis dong dong!

semanage fcontext -l | grep '/srv' 
/srv/.* all files system_u:object_r:var_t:s0 
/srv/([^/]*/)?ftp(/.*)? all files system_u:object_r:public_content_t:s0 
/srv/([^/]*/)?www(/.*)? all files system_u:object_r:httpd_sys_content_t:s0 /srv/([^/]*/)?rsync(/.*)? all files system_u:object_r:public_content_t:s0 /srv/gallery2(/.*)? all files system_u:object_r:httpd_sys_content_t:s0 
/srv directory system_u:object_r:var_t:s0 //看这里！

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The above is the security information of this article under the default /srv, however, it is not specified to /srv/samba.

semanage fcontext -a -t public_content_t "/srv/samba(/.*)?" 
semanage fcontext -l | grep '/srv/samba' 
/srv/samba(/.*)? all files system_u:object_r:public_content_t:s0

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cat /etc/selinux/targeted/contexts/files/file_contexts.local 
# This file is auto-generated by libsemanage # Please use the semanage command to make changes 
/srv/samba(/.*)? system_u:object_r:public_content_t:s0 #写入这个档案

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restorecon -Rv /srv/samba* #尝试恢复默认值 ll -Zd /srv/samba drwxr-xr-x root root system_u:object_r:public_content_t /srv/samba/ #有默认值，以后用restorecon命令来修改比较简单！

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