1ntpd_selinux(8) SELinux Policy ntpd ntpd_selinux(8)
2
6 ntpd_selinux - Security Enhanced Linux Policy for the ntpd processes
7
9 Security-Enhanced Linux secures the ntpd processes via flexible manda‐
10 tory access control.
11 The ntpd processes execute with the ntpd_t SELinux type. You can check
13 if you have these processes running by executing the ps command with
14 the -Z qualifier.
15 For example:
17 ps -eZ | grep ntpd_t
19
23 The ntpd_t SELinux type can be entered via the ntpd_exec_t, ntp‐
24 date_exec_t file types.
25 The default entrypoint paths for the ntpd_t domain are the following:
27 /etc/cron.(daily|weekly)/ntp-server, /etc/cron.(daily|weekly)/ntp-sim‐
29 ple, /usr/sbin/ntpd, /usr/sbin/sntp, /usr/sbin/ntpdate,
30 /usr/libexec/ntpdate-wrapper
31
33 SELinux defines process types (domains) for each process running on the
34 system
35 You can see the context of a process using the -Z option to ps
37 Policy governs the access confined processes have to files. SELinux
39 ntpd policy is very flexible allowing users to setup their ntpd pro‐
40 cesses in as secure a method as possible.
41 The following process types are defined for ntpd:
43 ntpd_t
45 Note: semanage permissive -a ntpd_t can be used to make the process
47 type ntpd_t permissive. SELinux does not deny access to permissive
48 process types, but the AVC (SELinux denials) messages are still gener‐
49 ated.
50
53 SELinux policy is customizable based on least access required. ntpd
54 policy is extremely flexible and has several booleans that allow you to
55 manipulate the policy and run ntpd with the tightest access possible.
56 If you want to allow users to resolve user passwd entries directly from
60 ldap rather then using a sssd server, you must turn on the authlo‐
61 gin_nsswitch_use_ldap boolean. Disabled by default.
62 setsebool -P authlogin_nsswitch_use_ldap 1
64 If you want to allow all domains to execute in fips_mode, you must turn
68 on the fips_mode boolean. Enabled by default.
69 setsebool -P fips_mode 1
71 If you want to allow confined applications to run with kerberos, you
75 must turn on the kerberos_enabled boolean. Enabled by default.
76 setsebool -P kerberos_enabled 1
78 If you want to allow system to run with NIS, you must turn on the
82 nis_enabled boolean. Disabled by default.
83 setsebool -P nis_enabled 1
85 If you want to allow confined applications to use nscd shared memory,
89 you must turn on the nscd_use_shm boolean. Disabled by default.
90 setsebool -P nscd_use_shm 1
92 If you want to support NFS home directories, you must turn on the
96 use_nfs_home_dirs boolean. Disabled by default.
97 setsebool -P use_nfs_home_dirs 1
99 If you want to support SAMBA home directories, you must turn on the
103 use_samba_home_dirs boolean. Disabled by default.
104 setsebool -P use_samba_home_dirs 1
106
110 SELinux defines port types to represent TCP and UDP ports.
111 You can see the types associated with a port by using the following
113 command:
114 semanage port -l
116 Policy governs the access confined processes have to these ports.
119 SELinux ntpd policy is very flexible allowing users to setup their ntpd
120 processes in as secure a method as possible.
121 The following port types are defined for ntpd:
123 ntp_port_t
126 Default Defined Ports:
130 udp 123
131
133 The SELinux process type ntpd_t can manage files labeled with the fol‐
134 lowing file types. The paths listed are the default paths for these
135 file types. Note the processes UID still need to have DAC permissions.
136 cluster_conf_t
138 /etc/cluster(/.*)?
140 cluster_var_lib_t
142 /var/lib/pcsd(/.*)?
144 /var/lib/cluster(/.*)?
145 /var/lib/openais(/.*)?
146 /var/lib/pengine(/.*)?
147 /var/lib/corosync(/.*)?
148 /usr/lib/heartbeat(/.*)?
149 /var/lib/heartbeat(/.*)?
150 /var/lib/pacemaker(/.*)?
151 cluster_var_run_t
153 /var/run/crm(/.*)?
155 /var/run/cman_.*
156 /var/run/rsctmp(/.*)?
157 /var/run/aisexec.*
158 /var/run/heartbeat(/.*)?
159 /var/run/corosync-qnetd(/.*)?
160 /var/run/corosync-qdevice(/.*)?
161 /var/run/corosync.pid
162 /var/run/cpglockd.pid
163 /var/run/rgmanager.pid
164 /var/run/cluster/rgmanager.sk
165 gpsd_tmpfs_t
167 ntp_drift_t
170 /var/lib/ntp(/.*)?
172 /etc/ntp/data(/.*)?
173 /var/lib/sntp(/.*)?
174 /var/lib/sntp-kod(/.*)?
175 ntpd_log_t
177 /var/log/ntp.*
179 /var/log/xntpd.*
180 /var/log/ntpstats(/.*)?
181 ntpd_tmp_t
183 ntpd_tmpfs_t
186 ntpd_var_run_t
189 /var/run/ntpd.pid
191 root_t
193 /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
195 /
196 /initrd
197 timemaster_tmpfs_t
199 tmpfs_t
202 /dev/shm
204 /var/run/shm
205 /usr/lib/udev/devices/shm
206
209 SELinux requires files to have an extended attribute to define the file
210 type.
211 You can see the context of a file using the -Z option to ls
213 Policy governs the access confined processes have to these files.
215 SELinux ntpd policy is very flexible allowing users to setup their ntpd
216 processes in as secure a method as possible.
217 STANDARD FILE CONTEXT
219 SELinux defines the file context types for the ntpd, if you wanted to
221 store files with these types in a diffent paths, you need to execute
222 the semanage command to sepecify alternate labeling and then use
223 restorecon to put the labels on disk.
224 semanage fcontext -a -t ntpd_var_run_t '/srv/myntpd_content(/.*)?'
226 restorecon -R -v /srv/myntpd_content
227 Note: SELinux often uses regular expressions to specify labels that
229 match multiple files.
230 The following file types are defined for ntpd:
232 ntpd_exec_t
236 - Set files with the ntpd_exec_t type, if you want to transition an
238 executable to the ntpd_t domain.
239 Paths:
242 /etc/cron.(daily|weekly)/ntp-server, /etc/cron.(daily|weekly)/ntp-
243 simple, /usr/sbin/ntpd
244 ntpd_initrc_exec_t
247 - Set files with the ntpd_initrc_exec_t type, if you want to transition
249 an executable to the ntpd_initrc_t domain.
250 ntpd_key_t
254 - Set files with the ntpd_key_t type, if you want to treat the files as
256 ntpd key data.
257 Paths:
260 /etc/ntp/crypto(/.*)?, /etc/ntp/keys
261 ntpd_log_t
264 - Set files with the ntpd_log_t type, if you want to treat the data as
266 ntpd log data, usually stored under the /var/log directory.
267 Paths:
270 /var/log/ntp.*, /var/log/xntpd.*, /var/log/ntpstats(/.*)?
271 ntpd_tmp_t
274 - Set files with the ntpd_tmp_t type, if you want to store ntpd tempo‐
276 rary files in the /tmp directories.
277 ntpd_tmpfs_t
281 - Set files with the ntpd_tmpfs_t type, if you want to store ntpd files
283 on a tmpfs file system.
284 ntpd_unit_file_t
288 - Set files with the ntpd_unit_file_t type, if you want to treat the
290 files as ntpd unit content.
291 ntpd_var_run_t
295 - Set files with the ntpd_var_run_t type, if you want to store the ntpd
297 files under the /run or /var/run directory.
298 ntpdate_exec_t
302 - Set files with the ntpdate_exec_t type, if you want to transition an
304 executable to the ntpdate_t domain.
305 Paths:
308 /usr/sbin/sntp, /usr/sbin/ntpdate, /usr/libexec/ntpdate-wrapper
309 Note: File context can be temporarily modified with the chcon command.
312 If you want to permanently change the file context you need to use the
313 semanage fcontext command. This will modify the SELinux labeling data‐
314 base. You will need to use restorecon to apply the labels.
315
318 semanage fcontext can also be used to manipulate default file context
319 mappings.
320 semanage permissive can also be used to manipulate whether or not a
322 process type is permissive.
323 semanage module can also be used to enable/disable/install/remove pol‐
325 icy modules.
326 semanage port can also be used to manipulate the port definitions
328 semanage boolean can also be used to manipulate the booleans
330 system-config-selinux is a GUI tool available to customize SELinux pol‐
333 icy settings.
334
337 This manual page was auto-generated using sepolicy manpage .
338
341 selinux(8), ntpd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
342 setsebool(8)
343ntpd 19-05-30 ntpd_selinux(8)