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Description of problem:
With latest patch:
From: "Daniel P. Berrange"<berrange>
If no 'security_driver' config option was set, then the code
just loaded the 'dac' security driver. This is a regression
on previous behaviour, where we would probe for a possible
security driver. ie default to SELinux if available.
This changes things so that it 'security_driver' is not set,
we once again do probing. For simplicity we also always
create the stack driver, even if there is only one driver
active.
The desired semantics are:
- security_driver not set
-> probe for selinux/apparmour/nop
-> auto-add DAC driver
- security_driver set to a string
-> add that one driver
-> auto-add DAC driver
- security_driver set to a list
-> add all drivers in list
-> auto-add DAC driver
It is not allowed, or possible to specify 'dac' in the
security_driver config param, since that is always
enabled.
Following config will have problem and should not be allowed:
security_driver as:
"dac"
[ "none" ]
[ "none", "dac" ]
[ "none", "selinux"]
[ "none", "selinux", "dac"]
It should be mentioned in doc and recorded in qemu.conf.
Following is what acceptable:
"none" this will auto-add DAC driver
"selinux" this will auto-add DAC driver
["selinux"] this will auto-add DAC driver
security_driver = [ "selinux", "apparmor" ] support use in this way, but we do not have apparmor.
Version-Release number of selected component (if applicable):
libvirt-0.10.1-1.el6.x86_64
How reproducible:
always
Steps to Reproduce:
1.
2.
3.
Actual results:
doc and qemu.conf not covered this
Expected results:
cover the detail
Additional info:
Comment 2Martin Kletzander
2012-09-05 04:49:40 UTC
Moving to POST:
commit 95fbc833874f93d099ed3e017f61699b905cd70c
Author: Martin Kletzander <mkletzan>
Date: Tue Sep 4 16:09:43 2012 +0200
conf: describe security_driver behavior
pkg:
libvirt-0.10.2-0rc1.el6.x86_64
The description updated in qemu.conf, so this is fixed.
# The default security driver is SELinux. If SELinux is disabled
# on the host, then the security driver will automatically disable
# itself. If you wish to disable QEMU SELinux security driver while
# leaving SELinux enabled for the host in general, then set this
# to 'none' instead. It's also possible to use more than one security
# driver at the same time, for this use a list of names separated by
# comma and delimited by square brackets. For example:
#
# security_driver = [ "selinux", "apparmor" ]
#
# Notes: The DAC security driver is always enabled; as a result, the
# value of security_driver cannot contain "dac". The value "none" is
# a special value; security_driver can be set to that value in
# isolation, but it cannot appear in a list of drivers.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
http://rhn.redhat.com/errata/RHSA-2013-0276.html
Description of problem: With latest patch: From: "Daniel P. Berrange"<berrange> If no 'security_driver' config option was set, then the code just loaded the 'dac' security driver. This is a regression on previous behaviour, where we would probe for a possible security driver. ie default to SELinux if available. This changes things so that it 'security_driver' is not set, we once again do probing. For simplicity we also always create the stack driver, even if there is only one driver active. The desired semantics are: - security_driver not set -> probe for selinux/apparmour/nop -> auto-add DAC driver - security_driver set to a string -> add that one driver -> auto-add DAC driver - security_driver set to a list -> add all drivers in list -> auto-add DAC driver It is not allowed, or possible to specify 'dac' in the security_driver config param, since that is always enabled. Following config will have problem and should not be allowed: security_driver as: "dac" [ "none" ] [ "none", "dac" ] [ "none", "selinux"] [ "none", "selinux", "dac"] It should be mentioned in doc and recorded in qemu.conf. Following is what acceptable: "none" this will auto-add DAC driver "selinux" this will auto-add DAC driver ["selinux"] this will auto-add DAC driver security_driver = [ "selinux", "apparmor" ] support use in this way, but we do not have apparmor. Version-Release number of selected component (if applicable): libvirt-0.10.1-1.el6.x86_64 How reproducible: always Steps to Reproduce: 1. 2. 3. Actual results: doc and qemu.conf not covered this Expected results: cover the detail Additional info: