crond_selinux(8) crond SELinux Policy documentation crond_selinux(8)NAMEcrond_selinux - Security Enhanced Linux Policy for the crond processes
DESCRIPTION
Security-Enhanced Linux secures the crond processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. crond
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run crond with the tightest access possible.
If you want to enable extra rules in the cron domain to support fcron,
you must turn on the fcron_crond boolean.
setsebool -P fcron_crond 1
If you want to allow system cron jobs to relabel filesystem for restor‐
ing file contexts, you must turn on the cron_can_relabel boolean.
setsebool -P cron_can_relabel 1
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the
crontab_t, crond_t, you must turn on the authlogin_nsswitch_use_ldap
boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
crontab_t, crond_t, you must turn on the allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the crontab_t, crond_t,
you must turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 1
FILE CONTEXTS
SELinux requires files to have an extended attribute to define the file
type.
You can see the context of a file using the -Z option to ls
Policy governs the access confined processes have to these files.
SELinux crond policy is very flexible allowing users to setup their
crond processes in as secure a method as possible.
The following file types are defined for crond:
crond_exec_t
- Set files with the crond_exec_t type, if you want to transition an
executable to the crond_t domain.
Paths:
/usr/sbin/atd, /usr/sbin/fcron, /usr/sbin/cron(d)?
crond_initrc_exec_t
- Set files with the crond_initrc_exec_t type, if you want to transi‐
tion an executable to the crond_initrc_t domain.
crond_tmp_t
- Set files with the crond_tmp_t type, if you want to store crond tem‐
porary files in the /tmp directories.
crond_unit_file_t
- Set files with the crond_unit_file_t type, if you want to treat the
files as crond unit content.
Paths:
/usr/lib/systemd/system/crond.*, /usr/lib/systemd/system/atd.*
crond_var_run_t
- Set files with the crond_var_run_t type, if you want to store the
crond files under the /run directory.
Paths:
/var/run/crond?.pid, /var/run/.*cron.*, /var/run/fcron.pid,
/var/run/crond?.reboot, /var/run/fcron.fifo, /var/run/atd.pid,
/var/run/anacron.pid
Note: File context can be temporarily modified with the chcon command.
If you want to permanantly change the file context you need to use the
semanage fcontext command. This will modify the SELinux labeling data‐
base. You will need to use restorecon to apply the labels.
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
Policy governs the access confined processes have to files. SELinux
crond policy is very flexible allowing users to setup their crond pro‐
cesses in as secure a method as possible.
The following process types are defined for crond:
crond_t, cronjob_t, crontab_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process
type permissive. Permissive process types are not denied access by
SELinux. AVC messages will still be generated.
COMMANDS
semanage fcontext can also be used to manipulate default file context
mappings.
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 pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genman.py.
SEE ALSOselinux(8), crond(8), semanage(8), restorecon(8), chcon(1) , setse‐
bool(8)dwalsh@redhat.com crond crond_selinux(8)
