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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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NAME | DESCRIPTION | FILE FORMAT | EXAMPLE | SEE ALSO | COLOPHON |
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selinux_config(5) SELinux configuration file selinux_config(5)
config - The SELinux sub-system configuration file.
The SELinux config file controls the state of SELinux regarding:
1. The policy enforcement status - enforcing, permissive
or disabled.
2. The policy name or type that forms a path to the
policy to be loaded and its supporting configuration
files.
3. How SELinux-aware login applications should behave if
no valid SELinux users are configured.
4. Whether the system is to be relabeled or not.
The entries controlling these functions are described in the FILE
FORMAT section.
The fully qualified path name of the SELinux configuration file
is /etc/selinux/config.
If the config file is missing or corrupt, then no SELinux policy
is loaded (i.e. SELinux is disabled).
The sestatus (8) command and the libselinux function selinux_path
(3) will return the location of the config file.
The config file supports the following parameters:
SELINUX = enforcing | permissive | disabled
SELINUXTYPE = policy_name
REQUIRESEUSERS = 0 | 1
AUTORELABEL = 0 | 1
Where:
SELINUX
This entry can contain one of three values:
enforcing
SELinux security policy is enforced.
permissive
SELinux security policy is not enforced but
logs the warnings (i.e. the action is allowed
to proceed).
disabled
No SELinux policy is loaded. This option was
used to disable SELinux completely, which is
now deprecated. Use the selinux=0 kernel boot
option instead (see selinux(8)).
The entry can be determined using the sestatus(8) command
or selinux_getenforcemode(3).
SELINUXTYPE
The policy_name entry is used to identify the policy type,
and becomes the directory name of where the policy and its
configuration files are located.
The entry can be determined using the sestatus(8) command
or selinux_getpolicytype(3).
The policy_name is relative to a path that is defined
within the SELinux subsystem that can be retrieved by
using selinux_path(3). An example entry retrieved by
selinux_path(3) is:
/etc/selinux/
The policy_name is then appended to this and becomes the
'policy root' location that can be retrieved by
selinux_policy_root_path(3). An example entry retrieved
is:
/etc/selinux/targeted
The actual binary policy is located relative to this
directory and also has a policy name pre-allocated. This
information can be retrieved using
selinux_binary_policy_path(3). An example entry retrieved
by selinux_binary_policy_path(3) is:
/etc/selinux/targeted/policy/policy
The binary policy name has by convention the SELinux
policy version that it supports appended to it. The
maximum policy version supported by the kernel can be
determined using the sestatus(8) command or
security_policyvers(3). An example binary policy file with
the version is:
/etc/selinux/targeted/policy/policy.24
REQUIRESEUSERS
This optional entry can be used to fail a login if there
is no matching or default entry in the seusers(5) file or
if the seusers file is missing.
It is checked by getseuserbyname(3) that is called by
SELinux-aware login applications such as PAM(8).
If set to 0 or the entry missing:
getseuserbyname(3) will return the GNU / Linux user
name as the SELinux user.
If set to 1:
getseuserbyname(3) will fail.
The getseuserbyname(3) man page should be consulted for
its use. The format of the seusers file is shown in
seusers(5).
AUTORELABEL
This is an optional entry that allows the file system to
be relabeled.
If set to 0 and there is a file called .autorelabel in the
root directory, then on a reboot, the loader will drop to
a shell where a root login is required. An administrator
can then manually relabel the file system.
If set to 1 or no entry present (the default) and there is
a .autorelabel file in the root directory, then the file
system will be automatically relabeled using fixfiles -F
restore
In both cases the /.autorelabel file will be removed so
that relabeling is not done again.
This example config file shows the minimum contents for a system
to run SELinux in enforcing mode, with a policy_name of
'targeted':
SELINUX = enforcing
SELINUXTYPE = targeted
selinux(8), sestatus(8), selinux_path(3),
selinux_policy_root_path(3), selinux_binary_policy_path(3),
getseuserbyname(3), PAM(8), fixfiles(8),
selinux_mkload_policy(3), selinux_getpolicytype(3),
security_policyvers(3), selinux_getenforcemode(3), seusers(5)
This page is part of the selinux (Security-Enhanced Linux user-
space libraries and tools) project. Information about the
project can be found at
⟨https://github.com/SELinuxProject/selinux/wiki⟩. If you have a
bug report for this manual page, see
⟨https://github.com/SELinuxProject/selinux/wiki/Contributing⟩.
This page was obtained from the project's upstream Git repository
⟨https://github.com/SELinuxProject/selinux⟩ on 2024-06-14. (At
that time, the date of the most recent commit that was found in
the repository was 2023-05-11.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
[email protected]
Security Enhanced Linux 18 Nov 2011 selinux_config(5)
Pages that refer to this page: selinux_colors_path(3), customizable_types(5), default_contexts(5), default_type(5), failsafe_context(5), removable_context(5), securetty_types(5), selabel_db(5), selabel_file(5), selabel_media(5), selabel_x(5), service_seusers(5), seusers(5), user_contexts(5), virtual_domain_context(5), virtual_image_context(5)
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HTML rendering created 2024-06-26 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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