1chronyd_selinux(8) SELinux Policy chronyd chronyd_selinux(8)
2
6 chronyd_selinux - Security Enhanced Linux Policy for the chronyd pro‐
7 cesses
8
10 Security-Enhanced Linux secures the chronyd processes via flexible
11 mandatory access control.
12 The chronyd processes execute with the chronyd_t SELinux type. You can
14 check if you have these processes running by executing the ps command
15 with the -Z qualifier.
16 For example:
18 ps -eZ | grep chronyd_t
20
24 The chronyd_t SELinux type can be entered via the chronyd_exec_t file
25 type.
26 The default entrypoint paths for the chronyd_t domain are the follow‐
28 ing:
29 /usr/sbin/chronyd, /usr/libexec/chrony-helper
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 chronyd policy is very flexible allowing users to setup their chronyd
40 processes in as secure a method as possible.
41 The following process types are defined for chronyd:
43 chronyd_t
45 Note: semanage permissive -a chronyd_t can be used to make the process
47 type chronyd_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. chronyd
54 policy is extremely flexible and has several booleans that allow you to
55 manipulate the policy and run chronyd with the tightest access possi‐
56 ble.
57 If you want to allow users to resolve user passwd entries directly from
61 ldap rather then using a sssd server, you must turn on the authlo‐
62 gin_nsswitch_use_ldap boolean. Disabled by default.
63 setsebool -P authlogin_nsswitch_use_ldap 1
65 If you want to allow all domains to execute in fips_mode, you must turn
69 on the fips_mode boolean. Enabled by default.
70 setsebool -P fips_mode 1
72 If you want to allow confined applications to run with kerberos, you
76 must turn on the kerberos_enabled boolean. Enabled by default.
77 setsebool -P kerberos_enabled 1
79 If you want to allow system to run with NIS, you must turn on the
83 nis_enabled boolean. Disabled by default.
84 setsebool -P nis_enabled 1
86 If you want to allow confined applications to use nscd shared memory,
90 you must turn on the nscd_use_shm boolean. Enabled by default.
91 setsebool -P nscd_use_shm 1
93
97 SELinux defines port types to represent TCP and UDP ports.
98 You can see the types associated with a port by using the following
100 command:
101 semanage port -l
103 Policy governs the access confined processes have to these ports.
106 SELinux chronyd policy is very flexible allowing users to setup their
107 chronyd processes in as secure a method as possible.
108 The following port types are defined for chronyd:
110 chronyd_port_t
113 Default Defined Ports:
117 udp 323
118
120 The SELinux process type chronyd_t can manage files labeled with the
121 following file types. The paths listed are the default paths for these
122 file types. Note the processes UID still need to have DAC permissions.
123 chronyd_tmpfs_t
125 chronyd_var_lib_t
128 /var/lib/chrony(/.*)?
130 chronyd_var_run_t
132 /var/run/chrony(/.*)?
134 /var/run/chronyd(/.*)?
135 /var/run/chrony-helper(/.*)?
136 /var/run/chronyd.pid
137 /var/run/chronyd.sock
138 cluster_conf_t
140 /etc/cluster(/.*)?
142 cluster_var_lib_t
144 /var/lib/pcsd(/.*)?
146 /var/lib/cluster(/.*)?
147 /var/lib/openais(/.*)?
148 /var/lib/pengine(/.*)?
149 /var/lib/corosync(/.*)?
150 /usr/lib/heartbeat(/.*)?
151 /var/lib/heartbeat(/.*)?
152 /var/lib/pacemaker(/.*)?
153 cluster_var_run_t
155 /var/run/crm(/.*)?
157 /var/run/cman_.*
158 /var/run/rsctmp(/.*)?
159 /var/run/aisexec.*
160 /var/run/heartbeat(/.*)?
161 /var/run/corosync-qnetd(/.*)?
162 /var/run/corosync-qdevice(/.*)?
163 /var/run/corosync.pid
164 /var/run/cpglockd.pid
165 /var/run/rgmanager.pid
166 /var/run/cluster/rgmanager.sk
167 gpsd_tmpfs_t
169 root_t
172 /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
174 /
175 /initrd
176 systemd_passwd_var_run_t
178 /var/run/systemd/ask-password(/.*)?
180 /var/run/systemd/ask-password-block(/.*)?
181 timemaster_tmpfs_t
183
187 SELinux requires files to have an extended attribute to define the file
188 type.
189 You can see the context of a file using the -Z option to ls
191 Policy governs the access confined processes have to these files.
193 SELinux chronyd policy is very flexible allowing users to setup their
194 chronyd processes in as secure a method as possible.
195 EQUIVALENCE DIRECTORIES
197 chronyd policy stores data with multiple different file context types
200 under the /var/run/chrony directory. If you would like to store the
201 data in a different directory you can use the semanage command to cre‐
202 ate an equivalence mapping. If you wanted to store this data under the
203 /srv dirctory you would execute the following command:
204 semanage fcontext -a -e /var/run/chrony /srv/chrony
206 restorecon -R -v /srv/chrony
207 STANDARD FILE CONTEXT
209 SELinux defines the file context types for the chronyd, if you wanted
211 to store files with these types in a diffent paths, you need to execute
212 the semanage command to sepecify alternate labeling and then use
213 restorecon to put the labels on disk.
214 semanage fcontext -a -t chronyd_tmp_t '/srv/mychronyd_content(/.*)?'
216 restorecon -R -v /srv/mychronyd_content
217 Note: SELinux often uses regular expressions to specify labels that
219 match multiple files.
220 The following file types are defined for chronyd:
222 chronyd_exec_t
226 - Set files with the chronyd_exec_t type, if you want to transition an
228 executable to the chronyd_t domain.
229 Paths:
232 /usr/sbin/chronyd, /usr/libexec/chrony-helper
233 chronyd_initrc_exec_t
236 - Set files with the chronyd_initrc_exec_t type, if you want to transi‐
238 tion an executable to the chronyd_initrc_t domain.
239 chronyd_keys_t
243 - Set files with the chronyd_keys_t type, if you want to treat the
245 files as chronyd keys data.
246 chronyd_tmp_t
250 - Set files with the chronyd_tmp_t type, if you want to store chronyd
252 temporary files in the /tmp directories.
253 chronyd_tmpfs_t
257 - Set files with the chronyd_tmpfs_t type, if you want to store chronyd
259 files on a tmpfs file system.
260 chronyd_unit_file_t
264 - Set files with the chronyd_unit_file_t type, if you want to treat the
266 files as chronyd unit content.
267 chronyd_var_lib_t
271 - Set files with the chronyd_var_lib_t type, if you want to store the
273 chronyd files under the /var/lib directory.
274 chronyd_var_log_t
278 - Set files with the chronyd_var_log_t type, if you want to treat the
280 data as chronyd var log data, usually stored under the /var/log direc‐
281 tory.
282 chronyd_var_run_t
286 - Set files with the chronyd_var_run_t type, if you want to store the
288 chronyd files under the /run or /var/run directory.
289 Paths:
292 /var/run/chrony(/.*)?, /var/run/chronyd(/.*)?, /var/run/chrony-
293 helper(/.*)?, /var/run/chronyd.pid, /var/run/chronyd.sock
294 Note: File context can be temporarily modified with the chcon command.
297 If you want to permanently change the file context you need to use the
298 semanage fcontext command. This will modify the SELinux labeling data‐
299 base. You will need to use restorecon to apply the labels.
300
303 semanage fcontext can also be used to manipulate default file context
304 mappings.
305 semanage permissive can also be used to manipulate whether or not a
307 process type is permissive.
308 semanage module can also be used to enable/disable/install/remove pol‐
310 icy modules.
311 semanage port can also be used to manipulate the port definitions
313 semanage boolean can also be used to manipulate the booleans
315 system-config-selinux is a GUI tool available to customize SELinux pol‐
318 icy settings.
319
322 This manual page was auto-generated using sepolicy manpage .
323
326 selinux(8), chronyd(8), semanage(8), restorecon(8), chcon(1), sepol‐
327 icy(8), setsebool(8)
328chronyd 19-10-08 chronyd_selinux(8)