| Current File : //proc/thread-self/root/kunden/usr/share/selinux/devel/html/ntpd.html |
<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Thu Apr 10 20:00:00 2025 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>ntpd_selinux</title>
</head>
<body>
<h1 align="center">ntpd_selinux</h1>
<a href="#NAME">NAME</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#ENTRYPOINTS">ENTRYPOINTS</a><br>
<a href="#PROCESS TYPES">PROCESS TYPES</a><br>
<a href="#BOOLEANS">BOOLEANS</a><br>
<a href="#PORT TYPES">PORT TYPES</a><br>
<a href="#MANAGED FILES">MANAGED FILES</a><br>
<a href="#FILE CONTEXTS">FILE CONTEXTS</a><br>
<a href="#COMMANDS">COMMANDS</a><br>
<a href="#AUTHOR">AUTHOR</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">ntpd_selinux
− Security Enhanced Linux Policy for the ntpd
processes</p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Security-Enhanced
Linux secures the ntpd processes via flexible mandatory
access control.</p>
<p style="margin-left:11%; margin-top: 1em">The ntpd
processes execute with the ntpd_t SELinux type. You can
check if you have these processes running by executing the
<b>ps</b> command with the <b>−Z</b> qualifier.</p>
<p style="margin-left:11%; margin-top: 1em">For
example:</p>
<p style="margin-left:11%; margin-top: 1em"><b>ps -eZ |
grep ntpd_t</b></p>
<h2>ENTRYPOINTS
<a name="ENTRYPOINTS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The ntpd_t
SELinux type can be entered via the <b>ntpd_exec_t,
ntpdate_exec_t</b> file types.</p>
<p style="margin-left:11%; margin-top: 1em">The default
entrypoint paths for the ntpd_t domain are the
following:</p>
<p style="margin-left:11%; margin-top: 1em">/etc/cron.(daily|weekly)/ntp-server,
/etc/cron.(daily|weekly)/ntp-simple, /usr/sbin/ntpd,
/usr/sbin/sntp, /usr/sbin/ntpdate,
/usr/libexec/ntpdate-wrapper</p>
<h2>PROCESS TYPES
<a name="PROCESS TYPES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">SELinux defines
process types (domains) for each process running on the
system</p>
<p style="margin-left:11%; margin-top: 1em">You can see the
context of a process using the <b>−Z</b> option to
<b>ps</b></p>
<p style="margin-left:11%; margin-top: 1em">Policy governs
the access confined processes have to files. SELinux ntpd
policy is very flexible allowing users to setup their ntpd
processes in as secure a method as possible.</p>
<p style="margin-left:11%; margin-top: 1em">The following
process types are defined for ntpd:</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_t</b></p>
<p style="margin-left:11%; margin-top: 1em">Note:
<b>semanage permissive -a ntpd_t</b> can be used to make the
process type ntpd_t permissive. SELinux does not deny access
to permissive process types, but the AVC (SELinux denials)
messages are still generated.</p>
<h2>BOOLEANS
<a name="BOOLEANS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">SELinux policy
is customizable based on least access required. ntpd policy
is extremely flexible and has several booleans that allow
you to manipulate the policy and run ntpd with the tightest
access possible.</p>
<p style="margin-left:11%; margin-top: 1em">If you want to
dontaudit all daemons scheduling requests (setsched,
sys_nice), you must turn on the daemons_dontaudit_scheduling
boolean. Enabled by default.</p>
<p style="margin-left:11%; margin-top: 1em"><b>setsebool -P
daemons_dontaudit_scheduling 1</b></p>
<p style="margin-left:11%; margin-top: 1em">If you want to
allow all domains to execute in fips_mode, you must turn on
the fips_mode boolean. Enabled by default.</p>
<p style="margin-left:11%; margin-top: 1em"><b>setsebool -P
fips_mode 1</b></p>
<p style="margin-left:11%; margin-top: 1em">If you want to
allow system to run with NIS, you must turn on the
nis_enabled boolean. Disabled by default.</p>
<p style="margin-left:11%; margin-top: 1em"><b>setsebool -P
nis_enabled 1</b></p>
<p style="margin-left:11%; margin-top: 1em">If you want to
support NFS home directories, you must turn on the
use_nfs_home_dirs boolean. Disabled by default.</p>
<p style="margin-left:11%; margin-top: 1em"><b>setsebool -P
use_nfs_home_dirs 1</b></p>
<p style="margin-left:11%; margin-top: 1em">If you want to
support SAMBA home directories, you must turn on the
use_samba_home_dirs boolean. Disabled by default.</p>
<p style="margin-left:11%; margin-top: 1em"><b>setsebool -P
use_samba_home_dirs 1</b></p>
<h2>PORT TYPES
<a name="PORT TYPES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">SELinux defines
port types to represent TCP and UDP ports.</p>
<p style="margin-left:11%; margin-top: 1em">You can see the
types associated with a port by using the following
command:</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
port -l</b></p>
<p style="margin-left:11%; margin-top: 1em">Policy governs
the access confined processes have to these ports. SELinux
ntpd policy is very flexible allowing users to setup their
ntpd processes in as secure a method as possible.</p>
<p style="margin-left:11%; margin-top: 1em">The following
port types are defined for ntpd: <b><br>
ntp_port_t</b></p>
<p style="margin-left:11%; margin-top: 1em">Default Defined
Ports:</p>
<p style="margin-left:26%;">udp 123</p>
<h2>MANAGED FILES
<a name="MANAGED FILES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The SELinux
process type ntpd_t can manage files labeled with the
following file types. The paths listed are the default paths
for these file types. Note the processes UID still need to
have DAC permissions.</p>
<p style="margin-left:11%; margin-top: 1em"><b>cluster_conf_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/etc/cluster(/.*)?</p>
<p style="margin-left:11%; margin-top: 1em"><b>cluster_var_lib_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/lib/pcsd(/.*)?
<br>
/var/lib/cluster(/.*)? <br>
/var/lib/openais(/.*)? <br>
/var/lib/pengine(/.*)? <br>
/var/lib/corosync(/.*)? <br>
/usr/lib/heartbeat(/.*)? <br>
/var/lib/heartbeat(/.*)? <br>
/var/lib/pacemaker(/.*)?</p>
<p style="margin-left:11%; margin-top: 1em"><b>cluster_var_run_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/run/crm(/.*)?
<br>
/var/run/cman_.* <br>
/var/run/rsctmp(/.*)? <br>
/var/run/aisexec.* <br>
/var/run/heartbeat(/.*)? <br>
/var/run/pcsd-ruby.socket <br>
/var/run/corosync-qnetd(/.*)? <br>
/var/run/corosync-qdevice(/.*)? <br>
/var/run/pcsd.socket <br>
/var/run/corosync.pid <br>
/var/run/cpglockd.pid <br>
/var/run/rgmanager.pid <br>
/var/run/cluster/rgmanager.sk</p>
<p style="margin-left:11%; margin-top: 1em"><b>gpsd_tmpfs_t</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>krb5_host_rcache_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/tmp/krb5_0.rcache2
<br>
/var/cache/krb5rcache(/.*)? <br>
/var/tmp/nfs_0 <br>
/var/tmp/DNS_25 <br>
/var/tmp/host_0 <br>
/var/tmp/imap_0 <br>
/var/tmp/HTTP_23 <br>
/var/tmp/HTTP_48 <br>
/var/tmp/ldap_55 <br>
/var/tmp/ldap_487 <br>
/var/tmp/ldapmap1_0</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntp_drift_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/lib/ntp(/.*)?
<br>
/etc/ntp/data(/.*)? <br>
/var/lib/sntp(/.*)? <br>
/var/lib/sntp-kod(/.*)?</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_log_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/log/ntp.*
<br>
/var/log/xntpd.* <br>
/var/log/ntpstats(/.*)?</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_tmp_t</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_tmpfs_t</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_var_run_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/var/run/ntpd.pid</p>
<p style="margin-left:11%; margin-top: 1em"><b>root_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
<br>
/ <br>
/initrd</p>
<p style="margin-left:11%; margin-top: 1em"><b>timemaster_tmpfs_t</b></p>
<p style="margin-left:11%; margin-top: 1em"><b>tmpfs_t</b></p>
<p style="margin-left:11%; margin-top: 1em">/dev/shm <br>
/var/run/shm <br>
/usr/lib/udev/devices/shm</p>
<h2>FILE CONTEXTS
<a name="FILE CONTEXTS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">SELinux
requires files to have an extended attribute to define the
file type.</p>
<p style="margin-left:11%; margin-top: 1em">You can see the
context of a file using the <b>−Z</b> option to
<b>ls</b></p>
<p style="margin-left:11%; margin-top: 1em">Policy governs
the access confined processes have to these files. SELinux
ntpd policy is very flexible allowing users to setup their
ntpd processes in as secure a method as possible.</p>
<p style="margin-left:11%; margin-top: 1em"><b>STANDARD
FILE CONTEXT</b></p>
<p style="margin-left:11%; margin-top: 1em">SELinux defines
the file context types for the ntpd, if you wanted to store
files with these types in a different paths, you need to
execute the semanage command to specify alternate labeling
and then use restorecon to put the labels on disk.</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
fcontext -a -t ntpd_var_run_t
’/srv/myntpd_content(/.*)?’ <br>
restorecon -R -v /srv/myntpd_content</b></p>
<p style="margin-left:11%; margin-top: 1em">Note: SELinux
often uses regular expressions to specify labels that match
multiple files.</p>
<p style="margin-left:11%; margin-top: 1em"><i>The
following file types are defined for ntpd:</i></p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_exec_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_exec_t type, if you want to transition an
executable to the ntpd_t domain. <br>
Paths:</p>
<p style="margin-left:18%;">/etc/cron.(daily|weekly)/ntp-server,
/etc/cron.(daily|weekly)/ntp-simple, /usr/sbin/ntpd</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_initrc_exec_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_initrc_exec_t type, if you want to transition
an executable to the ntpd_initrc_t domain.</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_key_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_key_t type, if you want to treat the files as
ntpd key data. <br>
Paths:</p>
<p style="margin-left:18%;">/etc/ntp/crypto(/.*)?,
/etc/ntp/keys</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_log_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_log_t type, if you want to treat the data as
ntpd log data, usually stored under the /var/log directory.
<br>
Paths:</p>
<p style="margin-left:18%;">/var/log/ntp.*,
/var/log/xntpd.*, /var/log/ntpstats(/.*)?</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_tmp_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_tmp_t type, if you want to store ntpd
temporary files in the /tmp directories.</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_tmpfs_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_tmpfs_t type, if you want to store ntpd files
on a tmpfs file system.</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_unit_file_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_unit_file_t type, if you want to treat the
files as ntpd unit content.</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpd_var_run_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpd_var_run_t type, if you want to store the ntpd
files under the /run or /var/run directory.</p>
<p style="margin-left:11%; margin-top: 1em"><b>ntpdate_exec_t</b></p>
<p style="margin-left:11%; margin-top: 1em">- Set files
with the ntpdate_exec_t type, if you want to transition an
executable to the ntpdate_t domain. <br>
Paths:</p>
<p style="margin-left:18%;">/usr/sbin/sntp,
/usr/sbin/ntpdate, /usr/libexec/ntpdate-wrapper</p>
<p style="margin-left:11%; margin-top: 1em">Note: File
context can be temporarily modified with the chcon command.
If you want to permanently change the file context you need
to use the <b>semanage fcontext</b> command. This will
modify the SELinux labeling database. You will need to use
<b>restorecon</b> to apply the labels.</p>
<h2>COMMANDS
<a name="COMMANDS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
fcontext</b> can also be used to manipulate default file
context mappings.</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
permissive</b> can also be used to manipulate whether or not
a process type is permissive.</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
module</b> can also be used to enable/disable/install/remove
policy modules.</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
port</b> can also be used to manipulate the port
definitions</p>
<p style="margin-left:11%; margin-top: 1em"><b>semanage
boolean</b> can also be used to manipulate the booleans</p>
<p style="margin-left:11%; margin-top: 1em"><b>system-config-selinux</b>
is a GUI tool available to customize SELinux policy
settings.</p>
<h2>AUTHOR
<a name="AUTHOR"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This manual
page was auto-generated using <b>sepolicy manpage .</b></p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">selinux(8),
ntpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
setsebool(8)</p>
<hr>
</body>
</html>