[CentOS] Selinux TFTP question [was: (no subject)]

Daniel J Walsh dwalsh at redhat.com
Mon Nov 18 14:02:43 UTC 2013


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On 11/18/2013 08:20 AM, Tris Hoar wrote:
> 
> On 16/11/2013 21:46, Andrew Holway wrote:
>> [root at ipa tftpboot]# semanage fcontext -l | grep tftp /tftpboot
>> directory system_u:object_r:tftpdir_t:s0 /tftpboot/.*
>> all files system_u:object_r:tftpdir_t:s0 /usr/sbin/atftpd
>> regular file system_u:object_r:tftpd_exec_t:s0 /usr/sbin/in\.tftpd
>> regular file system_u:object_r:tftpd_exec_t:s0 /var/lib/tftpboot(/.*)?
>> all files system_u:object_r:tftpdir_rw_t:s0 /var/lib/tftpboot/etc(/.*)?
>> all files system_u:object_r:cobbler_var_lib_t:s0 
>> /var/lib/tftpboot/grub(/.*)?                       all files 
>> system_u:object_r:cobbler_var_lib_t:s0 /var/lib/tftpboot/images(/.*)?
>> all files system_u:object_r:cobbler_var_lib_t:s0 
>> /var/lib/tftpboot/memdisk                          regular file 
>> system_u:object_r:cobbler_var_lib_t:s0 /var/lib/tftpboot/menu\.c32
>> regular file system_u:object_r:cobbler_var_lib_t:s0 
>> /var/lib/tftpboot/ppc(/.*)?                        all files 
>> system_u:object_r:cobbler_var_lib_t:s0 /var/lib/tftpboot/pxelinux\.0
>> regular file system_u:object_r:cobbler_var_lib_t:s0 
>> /var/lib/tftpboot/pxelinux\.cfg(/.*)?              all files 
>> system_u:object_r:cobbler_var_lib_t:s0 /var/lib/tftpboot/s390x(/.*)?
>> all files system_u:object_r:cobbler_var_lib_t:s0 /var/lib/tftpboot/yaboot
>> regular file system_u:object_r:cobbler_var_lib_t:s0
>> 
>> Could someone tell me why:
>> 
>> /var/lib/tftpboot(/.*)? - is using (/.*)?
> 
> This covers /var/lib/tftpboot and all files under it and gives them the 
> label tftpdir_rw_t
> 
>> 
>> /tftpboot/.* - is using .*
> 
> This covers all files under /tftpboot/ giving them the label tftpdir_t. 
> There is a separate entry for the directory: /tftpboot
> directory system_u:object_r:tftpdir_t:s0 As to why the difference I've no
> idea as looking at other root dirs with semanage fcontext -l I can see most
> of them use (/.*)? which makes sense.
> 
>> 
>> Thanks,
>> 
>> Andrew _______________________________________________ CentOS mailing
>> list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos
>> 
> 
> Regards,
> 
> Tris
> 
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There was some fixes used for udev that allowed labeling to run faster if the
top level directory had this type of labeling as I recall.  Probably not as
important with all of the improvements to labeling algorithms over the years.
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