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semanage
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===
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默认目录的安全上下文查询与修改
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## 说明
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**semanage命令** 是用来查询与修改SELinux默认目录的安全上下文。SELinux的策略与规则管理相关命令：seinfo命令、sesearch命令、getsebool命令、setsebool命令、semanage命令。
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### 语法
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```
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semanage {login|user|port|interface|fcontext|translation} -l
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semanage fcontext -{a|d|m} [-frst] file_spec
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```
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```
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-l：查询。
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fcontext：主要用在安全上下文方面。
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-a：增加，你可以增加一些目录的默认安全上下文类型设置。
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-m：修改。
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-d：删除。
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```
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### 实例
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查询一下`/var/www/html`的默认安全性本文的设置：
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```
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semanage fcontext -l
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SELinux fcontext type Context
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....(前面省略)....
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/var/www(/.*)? all files system_u:object_r:httpd_sys_content_t:s0
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....(後面省略)....
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```
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如上面例子所示，我们可以查询的到每个目录的安全性本文！而目录的设定可以使用正则表达式去指定一个范围。那么如果我们想要增加某些自定义目录的安全性本文呢？举例来说，我想要色设置`/srv/samba`成为 `public_content_t`的类型时，应该如何设置呢？
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用semanage命令设置`/srv/samba`目录的默认安全性本文为`public_content_t`：
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```
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mkdir /srv/samba
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ll -Zd /srv/samba
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drwxr-xr-x root root root:object_r:var_t /srv/samba
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```
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如上所示，默认的情况应该是`var_t`这个咚咚的！
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```
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semanage fcontext -l | grep '/srv'
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/srv/.* all files system_u:object_r:var_t:s0
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/srv/([^/]*/)?ftp(/.*)? all files system_u:object_r:public_content_t:s0
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/srv/([^/]*/)?www(/.*)? all files system_u:object_r:httpd_sys_content_t:s0
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/srv/([^/]*/)?rsync(/.*)? all files system_u:object_r:public_content_t:s0
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/srv/gallery2(/.*)? all files system_u:object_r:httpd_sys_content_t:s0
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/srv directory system_u:object_r:var_t:s0 //看这里！
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```
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上面则是默认的`/srv`底下的安全性本文资料，不过，并没有指定到`/srv/samba`。
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```
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semanage fcontext -a -t public_content_t "/srv/samba(/.*)?"
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semanage fcontext -l | grep '/srv/samba'
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/srv/samba(/.*)? all files system_u:object_r:public_content_t:s0
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```
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```
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cat /etc/selinux/targeted/contexts/files/file_contexts.local
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# This file is auto-generated by libsemanage
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# Please use the semanage command to make changes
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/srv/samba(/.*)? system_u:object_r:public_content_t:s0 #写入这个档案
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```
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```
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restorecon -Rv /srv/samba* #尝试恢复默认值
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ll -Zd /srv/samba
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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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```
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semanage命令的功能很多，这里主要用到的仅有fcontext这个选项的用法而已。如上所示，你可以使用semanage来查询所有的目录默认值，也能够使用它来增加默认值的设置！
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