SELinux: Difference between revisions
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* http://www.freekb.net/Article?id=1418 – SELinux - Change context of a file or directory (chcon restorecon semanage) !!!!! | * http://www.freekb.net/Article?id=1418 – SELinux - Change context of a file or directory (chcon restorecon semanage) !!!!! | ||
* http://www.freekb.net/Article?id=1169 – SELinux - Determine context of a file or directory | * http://www.freekb.net/Article?id=1169 – SELinux - Determine context of a file or directory | ||
* https://www.man7.org/linux/man-pages/man8/semanage.8.html | |||
* https://www.man7.org/linux/man-pages/man8/semanage-fcontext.8.html | |||
* https://www.man7.org/linux/man-pages/man8/restorecon.8.html | |||
learning.oreilly.com : | learning.oreilly.com : | ||
| Line 34: | Line 38: | ||
What "ll -Z" in addition to what "ll" usually displays, is called: | What "ll -Z" in addition to what "ll" usually displays, is called: | ||
* a | * a SELinux_USER_CONTEXT (unconfined_u) -> --seuser | ||
* a role (object_r) | * a role (object_r) | ||
* a TYPE_CONTEXT (user_home_t) | * a TYPE_CONTEXT (user_home_t) -> --type | ||
* a level (s0) | * a level (s0) | ||
<pre> | <pre> | ||
root@… $ semanage fcontext - | root@… $ semanage fcontext --add/--modify --seuser SELinux_USER_CONTEXT --type TYPE_CONTEXT /usr/local/foo.txt | ||
root@… $ restorecon -vF /usr/local/foo.txt | root@… $ restorecon -vF /usr/local/foo.txt | ||
</pre> | </pre> | ||
So usually for a systemd service file you would execute these 2 command lines: | So usually for a systemd service file you would execute these 2 command lines | ||
(derived from http://www.freekb.net/Article?id=1418): | |||
<pre> | <pre> | ||
root@… $ semanage fcontext - | root@… $ semanage fcontext --add/--modify --seuser system_u --type systemd_unit_file_t /usr/lib/systemd/system/tomcat.service | ||
root@… $ restorecon -vF /usr/lib/systemd/system/tomcat.service | root@… $ restorecon -vF /usr/lib/systemd/system/tomcat.service # -v for ''verbose'', -F for ''force reset'' | ||
</pre> | </pre> | ||
Revision as of 15:34, 7 September 2022
- https://en.wikipedia.org/wiki/Security-Enhanced_Linux
- https://people.redhat.com/duffy/selinux/selinux-coloring-book_A4-Stapled.pdf
- http://www.freekb.net/Article?id=1418 – SELinux - Change context of a file or directory (chcon restorecon semanage) !!!!!
- http://www.freekb.net/Article?id=1169 – SELinux - Determine context of a file or directory
- https://www.man7.org/linux/man-pages/man8/semanage.8.html
- https://www.man7.org/linux/man-pages/man8/semanage-fcontext.8.html
- https://www.man7.org/linux/man-pages/man8/restorecon.8.html
learning.oreilly.com :
- https://learning.oreilly.com/topics/selinux/
- https://learning.oreilly.com/library/view/selinux-system-administration/9781800201477/
- https://learning.oreilly.com/library/view/selinux-cookbook/9781783989669/
access.redhat.com :
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/using_selinux/
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/using_selinux/changing-selinux-states-and-modes_using-selinux
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/using_selinux/index
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/using_selinux/index#selinux-states-and-modes_getting-started-with-selinux
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/using_selinux/index#changing-selinux-states-and-modes_using-selinux
So far my usual approach for getting the SELinux context of a file right is:
# find a file with the right context! ("FILE_WITH_RIGHT_CONTEXT")
$ ll -Z FILE_WITH_RIGHT_CONTEXT
# rename the file, whose context isn't right, to FILE- or so!
$ mv FILE FILE-
# …
$ cp --arch FILE_WITH_RIGHT_CONTEXT FILE
# …
cat FILE- > FILE
# …
$ rm FILE-
…
What "ll -Z" in addition to what "ll" usually displays, is called:
- a SELinux_USER_CONTEXT (unconfined_u) -> --seuser
- a role (object_r)
- a TYPE_CONTEXT (user_home_t) -> --type
- a level (s0)
root@… $ semanage fcontext --add/--modify --seuser SELinux_USER_CONTEXT --type TYPE_CONTEXT /usr/local/foo.txt root@… $ restorecon -vF /usr/local/foo.txt
So usually for a systemd service file you would execute these 2 command lines (derived from http://www.freekb.net/Article?id=1418):
root@… $ semanage fcontext --add/--modify --seuser system_u --type systemd_unit_file_t /usr/lib/systemd/system/tomcat.service root@… $ restorecon -vF /usr/lib/systemd/system/tomcat.service # -v for ''verbose'', -F for ''force reset''
More examples:
…