Security-Enhanced Linux secures the hwclock processes via flexible mandatory access control.
The hwclock processes execute with the hwclock_t SELinux type. You can check if you have these processes running by executing the ps command with the -Z qualifier.
For example:
ps -eZ | grep hwclock_t
The hwclock_t SELinux type can be entered via the hwclock_exec_t file type.
The default entrypoint paths for the hwclock_t domain are the following:
/sbin/hwclock, /usr/sbin/hwclock
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux hwclock policy is very flexible allowing users to setup their hwclock processes in as secure a method as possible.
The following process types are defined for hwclock:
hwclock_t
Note: semanage permissive -a hwclock_t can be used to make the process type hwclock_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow all domains to execute in fips_mode, you must turn on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
The SELinux process type hwclock_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.
adjtime_t
/etc/adjtime
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux hwclock policy is very flexible allowing users to setup their hwclock processes in as secure a method as possible.
The following file types are defined for hwclock:
hwclock_exec_t
- Set files with the hwclock_exec_t type, if you want to transition an executable to the hwclock_t domain.
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 semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.