SELinux: Difference between revisions
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* 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#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 | * https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html-single/using_selinux/index#changing-selinux-states-and-modes_using-selinux | ||
== context of a file == | |||
* https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security-enhanced_linux/sect-security-enhanced_linux-working_with_selinux-selinux_contexts_labeling_files | |||
* https://www.man7.org/linux/man-pages/man8/semanage.8.html | |||
* https://www.man7.org/linux/man-pages/man8/semanage-fcontext.8.html | |||
* http://www.freekb.net/Article?id=1418 !!!!! | |||
* https://www.gnu.org/software/coreutils/manual/html_node/chcon-invocation.html – Change SELinux context of file | |||
So far my usual approach for getting the SELinux context of a file right is: | So far my usual approach for getting the SELinux context of a file right is: | ||
<pre> | <pre> | ||
# find a file with the right context! ("FILE_WITH_RIGHT_CONTEXT") | # find a file with the right context! ("FILE_WITH_RIGHT_CONTEXT") | ||
$ ll - | $ ll --context FILE_WITH_RIGHT_CONTEXT | ||
# rename the file, whose context isn't right, to FILE- or so! | # rename the file, whose context isn't right, to FILE- or so! | ||
$ mv FILE FILE- | $ mv FILE FILE- | ||
| Line 35: | Line 43: | ||
</pre> | </pre> | ||
What "ll -Z" (resp. "ll --context") in addition to what "ll" usually displays, is called: | |||
* a SELinux_USER_CONTEXT (unconfined_u) -> "semanage fcontext --modify --seuser" | |||
What "ll -Z" in addition to what "ll" usually displays, is called: | |||
* a SELinux_USER_CONTEXT (unconfined_u) -> --seuser | |||
* a role (object_r) | * a role (object_r) | ||
* a TYPE_CONTEXT (user_home_t) -> --type | * a TYPE_CONTEXT (user_home_t) -> "semanage fcontext --modify --type" | ||
* a level (s0) | * a level AKA RANGE (s0) -> "semanage fcontext " | ||
<pre> | <pre> | ||
root@… $ semanage fcontext --add/--modify --seuser SELinux_USER_CONTEXT --type TYPE_CONTEXT /usr/local/foo.txt | root@… $ chcon --no-dereference --user SELinux_USER_CONTEXT --role ROLE --type TYPE_CONTEXT --range RANGE /usr/local/foo.txt | ||
root@… $ restorecon -vF /usr/local/foo.txt | root@… $ semanage fcontext --add/--modify --seuser SELinux_USER_CONTEXT --type TYPE_CONTEXT --range RANGE /usr/local/foo.txt | ||
root@… $ restorecon -vF /usr/local/foo.txt # -v for ''verbose'', -F for ''force reset'' | |||
</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: | ||
<pre> | <pre> | ||
root@… $ semanage fcontext --add/--modify --seuser system_u --type systemd_unit_file_t /usr/lib/systemd/system/tomcat.service | 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 | ||
</pre> | </pre> | ||
Revision as of 12:07, 20 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
context of a file
- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/security-enhanced_linux/sect-security-enhanced_linux-working_with_selinux-selinux_contexts_labeling_files
- https://www.man7.org/linux/man-pages/man8/semanage.8.html
- https://www.man7.org/linux/man-pages/man8/semanage-fcontext.8.html
- http://www.freekb.net/Article?id=1418 !!!!!
- https://www.gnu.org/software/coreutils/manual/html_node/chcon-invocation.html – Change SELinux context of file
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 --context 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" (resp. "ll --context") in addition to what "ll" usually displays, is called:
- a SELinux_USER_CONTEXT (unconfined_u) -> "semanage fcontext --modify --seuser"
- a role (object_r)
- a TYPE_CONTEXT (user_home_t) -> "semanage fcontext --modify --type"
- a level AKA RANGE (s0) -> "semanage fcontext "
root@… $ chcon --no-dereference --user SELinux_USER_CONTEXT --role ROLE --type TYPE_CONTEXT --range RANGE /usr/local/foo.txt root@… $ semanage fcontext --add/--modify --seuser SELinux_USER_CONTEXT --type TYPE_CONTEXT --range RANGE /usr/local/foo.txt root@… $ restorecon -vF /usr/local/foo.txt # -v for ''verbose'', -F for ''force reset''
So usually for a systemd service file you would execute these 2 command lines:
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
More examples:
…