Linux 命令之chcon

chcon命令：修改對象（文件）的安全上下文。好比：用戶：角色：類型：安全級別。主要用在selinux中用來更改安全上下文。
命令格式：

   Chcon [OPTIONS…] CONTEXT FILES…..

   Chcon [OPTIONS…] –reference=PEF_FILES FILES…

說明：

    CONTEXT 爲要設置的安全上下文

    FILES 對象（文件）

    --reference 參照的對象

    PEF_FILES 參照文件上下文

    FILES      應用參照文件上下文爲個人上下文。

    OPTIONS 以下：

        -f          強迫執行

        -R         遞歸地修改對象的安全上下文

        -r ROLE    修改安全上下文角色的配置

        -t TYPE    修改安全上下文類型的配置

        -u USER   修改安全上下文用戶的配置

        -v         顯示冗長的信息

         -l, --range=RANGE    修改安全上下文中的安全級別

範例：

一、ftp

//If you want to share files anonymously <若是你想把這個共享給匿名的話，須要開啓如下>
chcon -R -t public_content_t /var/ftp

//If you want to setup a directory where you can upload files
＜若是你想讓你設置的FTP目錄能夠上傳文件的話，SELINUX須要設置＞
chcon -t public_content_rw_t /var/ftp/incoming

//You must also turn on the boolean allow_ftpd_anon_write <容許匿名用戶寫入權限＞
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<若是你但願你的FTP用戶能夠訪問本身的家目錄的話，須要開啓>
setsebool -P ftp_home_dir 1

//If you want to run ftpd as a daemon<若是你但願將vsftpd以daemon的方式運行的話，須要開啓>
setsebool -P ftpd_is_daemon 1

//You can disable SELinux protection for the ftpd daemon<你可讓SElinux中止保護vsftpd的daemon方式動行>
setsebool -P ftpd_disable_trans 1

 二、httpd
//If you want a particular domain to write to the public_content_rw_t domain
<若是但願具體個doman具備可寫權限的話，須要設置>
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被設置容許cgi的設置>
setsebool -P httpd_enable_cgi 1

//If you want to allow access to users home directories<容許用戶HHTP訪問其家目錄，該設定限僅於用戶的家目錄主頁>
setsebool -P httpd_enable_homedirs 1
chcon -R -t httpd_sys_content_t ~user/public_html

//httpd is allowed access to the controling terminal<容許httpd訪問終端＞
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 <關閉Selinux的關於httpd進程守護的保護>
setsebool -P httpd_disable_trans 1
service httpd restart

三、named

//If you want to have named update the master zone files <關於named,master更新selinux設定>
setsebool -P named_write_master_zones 1

//You can disable SELinux protection for the named daemon by executing
<關閉named的進程守護保護>
setsebool -P named_disable_trans 1
service named restart

四、nfs

//If you want to setup this machine to share nfs partitions read only
<Selinux將本機的NFS共享設置成只讀>
setsebool -P nfs_export_all_ro 1

//If you want to share files read/write<Selinux將本機的NFS共享設置成可讀可寫>
setsebool -P nfs_export_all_rw 1

//If you want to use a remote NFS server for the home directories on this machine
＜若是你想要將遠程NFS的家目錄共享到本機，須要開啓>
setsebool -P use_nfs_home_dirs 1

五、samba

//If you want to share files other than home directorie
<若是你但願將目錄共享給其餘用戶，你須要設置>
chcon -t samba_share_t /directory

//If you want to share files with multiple domains
若是samba服務器共享目錄給多個域，則須要：
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服務器要共享家目錄時：
setsebool -P samba_enable_home_dirs 1

//If you want to use a remote Samba server for the home directories on this machine
若是你需在本機上使用遠程samba服務器的家目錄
setsebool -P use_samba_home_dirs 1

//You can disable SELinux protection for the samba daemon by executing
關閉selinux關於samba的進程守護的保護
setsebool -P smbd_disable_trans 1
service smb restart

六、rsync

//If you want to share files using the rsync daemon
共享rsync目錄時：
chcon -t public_content_t /directories

//If you want to share files with multiple domains
容許其餘用戶寫入時
setsebool -P allow_rsync_anon_write=1

//You can disable SELinux protection for the rsync daemon by executing
中止rsync的進程保護
setsebool -P rsync_disable_trans 1

七、kerberos

//allow your system to work properly in a Kerberos environment
容許系統使用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

八、nis

Allow your system to work properly in a NIS environment 系統工做在nis環境時 setsebool -P allow_ypbind 1