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Atsushi SAKAI wrote:
Hi, James
I have a question just for interest.
The security context stores like
/etc/selinux/targeted/contexts/files/file_contexts.
But you are storeing the domain security label on libvirt specific XML.
Of course, this is good for libvirt POV.
Is it permitted for SELinux policy POV?
By the way, I want to see the further discussion of the Requirements.
Requirements not yet addressed include:
Thanks
Atsushi SAKAI
Both /etc/selinux/targeted/contexts/files/file_contexts and libvirt
specific XML are just indicators of the way the system should be setup.
The kernel policy is the final arbiter of the policy. So if the kernel
does not understand virt_image_t in
/etc/selinux/targeted/contexts/files/file_contexts, it will not allow
tools like rpm or restorecon to set it as a file context. Similarly if
the process label qemu_t is specified in the libvirt xml, and the kernel
policy does not know what a qemu_t is, it will not allow libvirt to
start a processes labeled qemu_t.
James Morris [EMAIL PROTECTED] wrote:
[snip]
The domain security label configuration format is as follows:
# virsh dumpxml sys1
domain
seclabel model='selinux'
labelsystem_u:system_r:virtd_t:s0/label
policytypetargeted/policytype
/seclabel
/domain
It's possible to query the security label of a running domain via virsh:
# virsh dominfo sys1
Id: 1
Name: sys1
UUID: fa3c8e06-0877-2a08-06fd-f2479b7bacb4
OS Type:hvm
State: running
CPU(s): 1
CPU time: 11.4s
Max memory: 524288 kB
Used memory:524288 kB
Autostart: disable
Security label: system_u:system_r:virtd_t:s0 (selinux/targeted/enforcing)
The security label is deterimed via the new virDomainGetSecLabel() API
method, which is transported over RPC to the backend driver (qemu in this
case), and is entirely independent of the local security model, if any.
e.g. this command could be run remotely from an entirely different
platform: you just see what's happening on the remote system, as with
other attributes of the domain.
Feedback on the design thus far is sought before proceeding to more
comprehensive integration.
In particular, I'd be interested in any thoughts on the placement of the
security labeling driver within libvirt, as this seems to be the most
critical architectural issue (I've already refactored this aspect once).
Currently, the idea is to attach the security labeling driver to the virt
driver, rather than implement it independently as a top-level component as
in the case of other types of drivers (e.g. storage). This is because
process-based security labeling is highly dependent on the kind of
virtualization in use, and may not make sense at all in some cases (e.g.
when using a non-Linux hypervisor, or containers).
In the case of qemu, a security labeling driver is added to qemud:
@@ -63,6 +64,7 @@ struct qemud_driver {
char *vncListen;
virCapsPtr caps;
+virSecLabelDriverPtr secLabelDriver;
};
and then initialized during qemud startup from qemudSecLabelInit().
During initialization, any available security labeling drivers are probed,
and the first one which thinks it should be used is installed. Top-level
libvirt API calls are then dispatched to the active security labeling
driver via the backend virt driver, as necessary.
Note that the security labeling framework in this release is always
built-in -- it can be made a compile-time option later if desired.
Requirements not yet addressed include:
- Labeling of resources and generally comprehensive labeling management
- Automatic labeling (e.g. for the simple isolation use-case)
- Integration of labeling support into higher-level management tools such
as virt-manager
- Integration with the audit subsystem to help with administration and
debugging
- Domain of interpretation (DOI) checking/translation
- Python bindings
As mentioned, the goal at this stage is to get feedback on the underlying
design: comments welcome!
- James
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James Morris
[EMAIL PROTECTED]
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