Re: chcon: failed to change context of '/usr/local/s amba/var/lib/ntp_signd' to ‘system_u:object_r:ntpd_t:s0’ : Permission denied.

On Sat, May 1, 2021 at 6:27 PM Jason Long <[email protected]> wrote:

> Hello,
> According to "
> https://wiki.samba.org/index.php/Time_Synchronisation_-_SELinux_Labeling_and_Policy",
> I want to set the SELinux, but I got below error:
>
> # chcon -u system_u -t ntpd_t /usr/local/samba/var/lib/ntp_signd
> chcon: failed to change context of '/usr/local/samba/var/lib/ntp_signd' to
> ‘system_u:object_r:ntpd_t:s0’: Permission denied
>

> # ps -eZ | grep ntpd_t
> system_u:system_r:ntpd_t:s0        2184 ?        00:00:00 ntpd
>
> # sestatus
> SELinux status:                 enabled
> SELinuxfs mount:                /sys/fs/selinux
> SELinux root directory:         /etc/selinux
> Loaded policy name:             targeted
> Current mode:                   enforcing
> Mode from config file:          enforcing
> Policy MLS status:              enabled
> Policy deny_unknown status:     allowed
> Memory protection checking:     actual (secure)
> Max kernel policy version:      33
>
>
> Why?
>
Hi Jason,

I am afraid the wiki page is incorrect regarding the ntpd_t type, and the
selinux policy lower on the page is not something which I would recommend
to use.

The ntpd_t type is a domain type which cannot be assigned to a file. I am
not aware of how the feature works so I cannot suggest further.
Note in current Fedora there are chronyd and systemd-timesyncd services for
time synchronisation. The chrony.conf man page suggest to use
              ntpsigndsocket /var/lib/samba/ntp_signd
so it may be sufficient to leave it as is. If there is a regular service
running in the initrc_t domain, it should be confined by SELinux, but that
is a long term solution.




>
>
> Thanks.
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-- 

Zdenek Pytela
Security SELinux team

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