On Sat, May 1, 2021 at 6:27 PM Jason Long <hack3rcon@xxxxxxxxx> 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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