From: ao@morpork.de (Amon Ott)
Subject: Notes about RSBAC status and behaviour
Date: 06 Jun 2000 12:31:00 +0200
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Hi all!
Some notes:
- All recent RSBAC versions do not intercept sys_kill properly with a
SEND_SIGNAL request. I just uploaded a new 2.2.15 patch into the pre dir
which includes this. Please check it, MAC people please double check it,
because signals to processes are treated as write access.
I will not include this into all existing patches, so please tell me,
what versions you really need. Only those will be included in the 1.0.9b
release, which I want to get out quickly now.
- Despite older docs, ADD_TO_KERNEL never gets a FILE target. This is
technically impossible, because the module syscalls do not tell file
names. If you want to limit module loading to some files/dirs, use RC
to do the following:
- add a new role 'Module loader'
- add a new type 'Legal modules'
- set rc_force_role for /sbin/insmod etc. to the new role
- disallow ADD_TO_KERNEL and REMOVE_FROM_KERNEL to target SCD-other for
role Sysadmin
- allow these for the new role
- limit READ-OPEN access for the new role to the new type only (you will
still need SEARCH for general type)
- Change the type of your legal module dirs/files to the new type
- if insmod etc. need library access, also give SEARCH and READ_OPEN to
your library type (add one, if you don't have one - you will need it
anyway for other roles)
- Please note that your legal modules are now write protected, too. You
will have to give role Sysadmin temporary write access for changes.
- 2.4.xx kernels will not be support in 1.0.9b release, but will be added
later - this has already been mentioned. 2.3.99-pre4 heavily changed
file lookup, and RSBAC needs some significant changes due to this.
- rsbac-klogd by Stanislav has been uploaded into pre dir. Please test it.
Amon.
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