[PR #5830/c8a2ac3a backport][stable-6] sefcontext: add support for path substitutions #6098
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* sefcontext: add path substitution support (#1193) First commit for feedback, missing docs and tests. * sefcontext: add documentation * Add changelog fragment * Documentation formatting * Delete extra newline * pep8 fixes Fix indentation * Add version_added to arg docs * Add examples * Don't delete non-matching path substitutions * Add integration tests * Delete only substitutions if such arg passed Don't delete existing regular file context mappings if deletion of a path substitution was requested with the presence of the `equal` arg - delete only path substitutions in such case. Path substitutions and regular mappings may overlap. * Can only add args in minor releases :( * Cleanup before tests * Fix deletion using substitution Was comparing wrong var. * Fix test checking wrong var * Improve args documentation and examples List the default values for selevel, seuser. Add example for deleting path substitutions only. * Add attributes documentation block Not sure if should add become/delegate/async, shouldn't those work just like that without any specific code added for them? * and fix indentation on attribute block * Consistent indentation for attributes Confusing, most plugins indent with 4 spaces. But some use 2 like the rest of the code, so use 2. * Add missing ref for attribute block * Use correct c.g version in doc block Co-authored-by: Felix Fontein <felix@fontein.de> * Add full stop to changelog fragment Co-authored-by: Felix Fontein <felix@fontein.de> * Streamline documentation Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com> * Support limiting deletion to setype Deleting file context mappings may be limited by passing setype or equal, if neither arg is passed then delete either setype/equal mappings that match. * Change arg name, diff mode output fix Change arg name from equal to substitute. Print target = subsitute in diff mode same way as semanage does. Also put back platform attribute, try to improve clumsy language in the substitute arg docs. * Delete even if arg setype not match existing Test 5 indicates that deletion is supposed to not check that the arg setype passed when deleting matches the setype of the mapping to delete. Delete any mapping that matches target, regardless of setype arg value. * Update arg name in tests * Too eager replacing Accidentally replaced seobject function names so fix them back * 4564: Fix invalid setype in doc example Change from httpd_git_rw_content_t which does not exist to httpd_sys_rw_content_t Fixes #4564 * Fix documentation attributes Additional fragment Co-authored-by: Felix Fontein <felix@fontein.de> * Update version_added in docs Bumping minor to 6.4.0 since it didn't make 6.3.0. * Add more description to the new arg docs Try to improve discoverability of the new feature and make it easier to understand without deep SELinux understanding. * Update platform to Linux in documentation * Add equal as alias for the new argument Improve discoverability of the new feature by adding an alias to the new module argument. The argument name "equal" will be easy to find for users who are not familiar with SELinux and who just try to match to the CLI tool `semanage`. * And add alias argument properly Previous commit missed actually adding the alias (added to docs only). --------- Co-authored-by: Felix Fontein <felix@fontein.de> Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com> (cherry picked from commit c8a2ac3)
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This is a backport of PR #5830 as merged into main (c8a2ac3).
SUMMARY
Fixes #1193.
Add support for path substitution mappings in the
sefcontextmodule.I would like to get feedback on this architecture that is quite a bit different from another (dead) PR #5189:
setypeargument withstate=absent- it is not really required for deletion and it was not even used in the old code.setypeorsubstitutearg passed: delete both path substitutions and regular context mappings fortargetif either was found when deletion requested.substitutewas passed withstate=absentthen delete only that equivalence if found (don't delete regular context mappings); if not found then return unchanged, if found buttargetsubstitutes some other path then return unchanged.setypewas passed withstate=absentthen delete only existing context mappings (don't delete path substitutions), don't care about thesetypematching the current mapping to delete (this is the old behavior which seems a bit loose).Fixes #4564.
Change the incorrect
setypein documentation example to a working label.ISSUE TYPE
COMPONENT NAME
sefcontext
ADDITIONAL INFORMATION
Feedback please! It is the largest code change I have done yet so I really need feedback.
sefcontext setype=tmp_t target=/opt/tmp state=absent: what if/opt/tmpis currently not mapped totmp_t, say it's mapped toopt_t- in this case should the module just returnchanged=false? Or should it delete the mapping anyways? The old behavior is the latter and I've kept that unchanged. Personally I feel that it is wrong and would like to hear feedback on this.substitute? I couldn't come up with a great name for it. Themanpage forsemanage-fcontexttalks about "path substitution" and the switch-efor this is called "equals". Better args names welcome: current comments seem to supportsubstitutebut there is also request to addequalas an alias (I would hesitate, perhaps unnecessarily, to add an alias to a new feature).Also adds "attributes" block to documentation & some minor documentation improvements.