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On Wed, 2005-10-19 at 10:54 -0400, Andy Dustman wrote: |
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> I'm missing some important piece of how to properly mount NFS |
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> filesystems under SELinux. I can get the filesystem to mount, but if I |
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> try to access it, I get permission denied. Additionally, doing ls -dZ |
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> on the mount point shows (none) as the label. |
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NFS does not support exporting of labels, since it does not support |
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xattr. Any NFS filesystems you mount will have (none) as the labels, |
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and all of the contents will have the label system_u:object_r:nfs_t, |
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even if the server is a SELinux machine. So on your client, you have to |
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give access to nfs_t. |
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> So I'm guessing it's labeled nfs_t as would be expected, but even |
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> getting the label is not allowed for the context. |
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I'm not sure what you mean by "getting the label is not allowed for the |
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context". |
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> I'm aware of the need for NFS extensions on the client and server in |
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> order to fully-implement file labelling. |
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Right, except it will not likely be available anytime soon (if ever). |
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You could try the NFSv3 experimental code on nsa.gov/selinux, but I have |
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no idea if its up to date, and its not likely production quality. If |
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NFS were to get real labeling support, it would be on NFSv4, not v3. |
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In fact, I think CIFS is probably the closest network filesystem to |
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having support for SELinux, as it has xattr support. It may just need |
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to be enhanced to have security labels, but I'm not sure. |
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> The server in this case is a NetApp Filer, so I don't expect it to |
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> magically work. From what I am able to tell, all the files should be |
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> labeled nfs_t, but I'm not really sure about this, based on |
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> tunable.te, i.e. nfs_portdir and nfs_home_dirs. |
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You turn on nfs_portdir if you have a portage tree or overlay on NFS. |
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Nfs_home_dirs is if you have a NFS /home. |
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-- |
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Chris PeBenito |
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<pebenito@g.o> |
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Developer, |
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Hardened Gentoo Linux |
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Embedded Gentoo Linux |
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|
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Public Key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0xE6AF9243 |
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Key fingerprint = B0E6 877A 883F A57A 8E6A CB00 BC8E E42D E6AF 9243 |
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