SELinux prevents Samba from sharing NTFS mounts.
Daniel J Walsh
dwalsh at redhat.com
Thu Dec 13 21:13:57 UTC 2007
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Petteri Kautonen wrote:
> Hi,
> I have F8 and every time to I try to access remotely or locally NTFS filesystems
> that shared via Samba I get a warning (at the end of this mesage) from SELinux
> troubleshooter and can't access the share.
> I have tried to mount the filesystem with different context's but none of them
> seem to do anything. The shares worked with previous version of Fedora (F7). I
> have tried to mount the NTFS volume doing the following to change it context:
> * mount -t ntfs-3g /dev/sda1 /mnt/petteri-c -o context=system_u:system_r:smbd_t
> * mount -t ntfs-3g /dev/sda1 /mnt/petteri-c -o context=system_u:object_r:smbd_t
> * mount -t ntfs-3g /dev/sda1 /mnt/petteri-c -o
> fscontext=system_u:object_r:samba_share_t
> and various other mount options such as defcontext= and changed the context=,
> fscontext=, and defcontext= parameter values.
> But the context stays the same (ls --lcontext):
> drwxrwxrwx 1 _system_u:object_r:fusefs_t_ root root 12288 2007-12-12
> 21:13 petteri-c
>
> So how I am going tho get SELinux to allow Samba to share mounted NTFS
> filesystem? (Sorry about the newbie question :( and possibly bad english).
> SELinux is enforcing/targetted and all the booleans that refer to smbd are
> checked allow from SELinux Administration.
>
> /Summary
> SELinux is preventing samba (smbd) "read" to <Unknown> (fusefs_t).
>
> Detailed Description
> SELinux denied samba access to <Unknown>. If you want to share this
> directory with samba it has to have a file context label of samba_share_t.
> If you did not intend to use <Unknown> as a samba repository it could
> indicate either a bug or it could signal a intrusion attempt.
>
> Allowing Access
> You can alter the file context by executing chcon -R -t samba_share_t
> <Unknown> You must also change the default file context files on the system
> in order to preserve them even on a full relabel. "semanage fcontext -a -t
> samba_share_t <Unknown>"
>
> The following command will allow this access:
> chcon -R -t samba_share_t <Unknown>
>
> Additional Information
>
> Source Context system_u:system_r:smbd_t
> Target Context system_u:object_r:fusefs_t
> Target Objects None [ dir ]
> Affected RPM Packages
> Policy RPM selinux-policy-3.0.8-64.fc8
> Selinux Enabled True
> Policy Type targeted
> MLS Enabled True
> Enforcing Mode Enforcing
> Plugin Name plugins.samba_share
> Host Name petteri
> Platform Linux petteri 2.6.23.8-63.fc8 #1 SMP Wed Nov 21
> 18:51:08 EST 2007 i686 athlon
> Alert Count 126
> First Seen ke 14. marraskuuta 2007 15:57:05
> Last Seen to 13. joulukuuta 2007 07:13:17
> Local ID 2f2fd1b5-757e-4b37-a44f-eb76e86a81c2
> Line Numbers
>
> Raw Audit Messages
>
> avc: denied { read } for comm=smbd dev=sda1 name=/ pid=21782
> scontext=system_u:system_r:smbd_t:s0 tclass=dir
> tcontext=system_u:object_r:fusefs_t:s0
>
>
> /
>
>
> ------------------------------------------------------------------------
>
> --
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> fedora-selinux-list at redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-selinux-list
You should mount them as samba_share_t
mount -t ntfs-3g /dev/sda1 /mnt/petteri-c -o
context=system_u:system_r:samba_share_t
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