chcon命令：修改对象（文件）的安全上下文。比如：用户：角色：类型：安全级别。

命令格式：

   Chcon [OPTIONS…] CONTEXT FILES…..

   Chcon [OPTIONS…] –reference=PEF_FILES FILES…

说明：

    CONTEXT 为要设置的安全上下文

    FILES 对象（文件）

    --reference 参照的对象

    PEF_FILES 参照文件上下文

    FILES      应用参照文件上下文为我的上下文。

    OPTIONS 如下：

        -f          强迫执行

        -R         递归地修改对象的安全上下文

        -r ROLE    修改安全上下文角色的配置

        -t TYPE    修改安全上下文类型的配置

        -u USER   修改安全上下文用户的配置

        -v         显示冗长的信息

         -l, --range=RANGE    修改安全上下文中的安全级别

范例：

1、ftp

//If you want to share files anonymously <如果你想把这个共享给匿名的话，需要开启以下>

chcon -R -t public_content_t /var/ftp

//If you want to setup a directory where you can upload files

＜如果你想让你设置的FTP目录可以上传文件的话，SELINUX需要设置＞

chcon -t public_content_rw_t /var/ftp/incoming

//You must also turn on the boolean allow_ftpd_anon_write <允许匿名用户写入权限＞

setsebool -P allow_ftpd_anon_write=1

//If you are setting up this machine as a ftpd server and wish to allow users to access their home directorories<如果你希望你的FTP用户可以访问自己的家目录的话，需要开启>

setsebool -P ftp_home_dir 1

//If you want to run ftpd as a daemon<如果你希望将vsftpd以daemon的方式运行的话，需要开启>

setsebool -P ftpd_is_daemon 1

//You can disable SELinux protection for the ftpd daemon<你可以让SElinux停止保护vsftpd的daemon方式动行>

setsebool -P ftpd_disable_trans 1

 2、httpd

//If you want a particular domain to write to the public_content_rw_t domain

<如果希望具体个doman具有可写权限的话，需要设置>

setsebool -P allow_httpd_anon_write=1

or

setsebool -P allow_httpd_sys__anon_write=1

//httpd can be setup to allow cgi s to be executed <HTTP被设置允许cgi的设置>

setsebool -P httpd_enable_cgi 1

//If you want to allow access to users home directories<允许用户HHTP访问其家目录，该设定限仅于用户的家目录主页>

setsebool -P httpd_enable_homedirs 1

chcon -R -t httpd_sys_content_t ~user/public_html

//httpd is allowed access to the controling terminal<允许httpd访问终端＞

setsebool -P httpd_tty_comm 1

//such that one httpd service can not interfere with another

setsebool -P httpd_unified 0

//loadable modules run under the same context as httpd

setsebool -P httpd_builtin_ing 0

//httpd s are allowed to connect out to the network

setsebool -P httpd_can_network_connect 1

// You can disable suexec transition

setsebool -P httpd_suexec_disable_trans 1

//You can disable SELinux protection for the httpd daemon by executing <关闭Selinux的关于httpd进程守护的保护>

setsebool -P httpd_disable_trans 1

service httpd restart

3、named

//If you want to have named update the master zone files <关于named,master更新selinux设定>

setsebool -P named_write_master_zones 1

//You can disable SELinux protection for the named daemon by executing

<关闭named的进程守护保护>

setsebool -P named_disable_trans 1

service named restart

4、nfs

//If you want to setup this machine to share nfs partitions read only

<Selinux将本机的NFS共享设置成只读>

setsebool -P nfs_export_all_ro 1

//If you want to share files read/write<Selinux将本机的NFS共享设置成可读可写>

setsebool -P nfs_export_all_rw 1

//If you want to use a remote NFS server for the home directories on this machine

＜如果你想要将远程NFS的家目录共享到本机，需要开启>

setsebool -P use_nfs_home_dirs 1

5、samba

//If you want to share files other than home directorie

<如果你希望将目录共享给其他用户，你需要设置>

chcon -t samba_share_t /directory

//If you want to share files with multiple domains

如果samba服务器共享目录给多个域，则需要：

setsebool -P allow_smbd_anon_write=1

//If you are setting up this machine as a Samba server and wish to share the home directories

samba服务器要共享家目录时：

setsebool -P samba_enable_home_dirs 1

//If you want to use a remote Samba server for the home directories on this machine

如果你需在本机上使用远程samba服务器的家目录

setsebool -P use_samba_home_dirs 1

//You can disable SELinux protection for the samba daemon by executing

关闭selinux关于samba的进程守护的保护

setsebool -P smbd_disable_trans 1

service smb restart

6、rsync

//If you want to share files using the rsync daemon

共享rsync目录时：

chcon -t public_content_t /directories

//If you want to share files with multiple domains

允许其他用户写入时

setsebool -P allow_rsync_anon_write=1

//You can disable SELinux protection for the rsync daemon by executing

停止rsync的进程保护

setsebool -P rsync_disable_trans 1

7、kerberos

//allow your system to work properly in a Kerberos environment

允许系统使用kerberos

setsebool -P allow_kerberos 1

//If you are running Kerberos daemons kadmind or krb5kdc

setsebool -P krb5kdc_disable_trans 1

service krb5kdc restart

setsebool -P kadmind_disable_trans 1

service kadmind restart

8、nis

Allow your system to work properly in a NIS environment

系统工作在nis环境时

setsebool -P allow_ypbind 1

[出处: http://www.landui.com/lin_jianying/blog/static/1309355862012149519935/]