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           NSA  Security-Enhanced Linux (SELinux) is an implementation of a flexi-
           ble mandatory access control architecture in the Linux  operating  sys-
           tem.   The  SELinux  architecture  provides  general  support  for  the
           enforcement of many kinds of mandatory access control policies, includ-
           ing  those  based  on  the  concepts  of Type Enforcement(R), Role- Based
           Access Control, and Multi-Level Security.  Background  information  and
           technical    documentation    about    SELinux    can   be   found   at
           The /etc/selinux/config configuration file controls whether SELinux  is
           enabled  or  disabled, and if enabled, whether SELinux operates in per-
           missive mode or enforcing mode.  The SELINUX variable may be set to any
           one  of  disabled,  permissive,  or  enforcing  to  select one of these
           options.  The disabled option completely disables  the  SELinux  kernel
           and  application  code,  leaving the system running without any SELinux
           protection.  The permissive option enables the SELinux code, but causes
           it  to  operate in a mode where accesses that would be denied by policy
           are permitted but audited.  The enforcing option  enables  the  SELinux
           code  and causes it to enforce access denials as well as auditing them.
           Permissive mode may yield a different set  of  denials  than  enforcing
           mode,  both  because enforcing mode will prevent an operation from pro-
           ceeding past the first denial and because some  application  code  will
           fall back to a less privileged mode of operation if denied access.
           The /etc/selinux/config configuration file also controls what policy is
           active on the system.  SELinux  allows  for  multiple  policies  to  be
           installed on the system, but only one policy may be active at any given
           time.  At present, multiple kinds of SELinux  policy  exist:  targeted,
           mls  for  example.   The  targeted policy is designed as a policy where
           most user processes operate without  restrictions,  and  only  specific
           services are placed into distinct security domains that are confined by
           the policy.  For example, the user would run in a completely unconfined
           domain  while the named daemon or apache daemon would run in a specific
           domain tailored to its operation.  The MLS (Multi-Level Security)  pol-
           icy  is  designed  as a policy where all processes are partitioned into
           fine-grained security domains and confined by policy.   MLS  also  sup-
           ports  the  Bell  And LaPadula model, where processes are not only con-
           fined by the type but also the level of the data.
           You can define which policy you will run  by  setting  the  SELINUXTYPE
           environment  variable  within /etc/selinux/config.  You must reboot and
           possibly relabel if you change the policy type to have it  take  effect
           on  the  system.   The corresponding policy configuration for each such
           policy must be installed in  the  /etc/selinux/{SELINUXTYPE}/  directo-
           A given SELinux policy can be customized further based on a set of com-
           pile-time tunable  options  and  a  set  of  runtime  policy  booleans.
           system-config-selinux  allows  customization of these booleans and tun-
           bility.   The restorecon/fixfiles commands are also available for rela-
           beling files.


           This manual page was written by Dan Walsh <>.




           booleans(8), setsebool(8), togglesebool(8), restorecon(8), fixfiles(8),
           setfiles(8), semanage(8)
           Every confined service on the system has a man page in the following
           For example, httpd has the httpd_selinux(8) man page.
           man -k selinux
           Will list all SELinux man pages.
 29 Apr 2005 selinux(8)


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