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Sean E. Millichamp wrote:
I have been working on SELinux support for Puppet. One issue that has cropped up is the behavior on filesystems which don't support SELinux.
They all appear to get a default label, some seem to allow changing the label (VFAT) in a non-persistent manner, some seem to throw "not supported" errors (NFS).
How can I detect if a file is on a filesystem which supports SELinux without trying to update the label?
The best idea so far as been to parse /proc/mounts and use that to determine what type of filesystem a file lives on, then check it against a whitelist (which would include ext3, xfs, ?) but it seems like there has to be a cleaner/simpler way.
What I would like would be a "getfilecon" call that returns the real label, ignoring any mount-time defaults.
Any ideas?
Thanks, Sean
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I have been waiting for some one else to respond to this. I think this would be better sent to the nsa selinux list for better discussion.
The problem with your parsing of the /proc/mounts is that it would not give you an accurate idea of what supports and what does not support SELinux labeling. Also this can change over time.
If I mount an ext3 file system with a context mount, then it will no longer allow you to set the file context. I think the best idea is just attempt to assign the context and if it fails, ignore the error. I guess you can report it, if in verbose mode as a warning.
Others may have different ideas.