system_cronjob_selinux(8)SELinux Policy system_cronjosystem_cronjob_selinux(8)NAMEsystem_cronjob_selinux - Security Enhanced Linux Policy for the sys‐
tem_cronjob processes
DESCRIPTION
Security-Enhanced Linux secures the system_cronjob processes via flexi‐
ble mandatory access control.
The system_cronjob processes execute with the system_cronjob_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 system_cronjob_t
ENTRYPOINTS
The system_cronjob_t SELinux type can be entered via the sys‐
tem_cron_spool_t, unlabeled_t, proc_type, file_type, mtrr_device_t,
filesystem_type, sysctl_type, shell_exec_t, anacron_exec_t file types.
The default entrypoint paths for the system_cronjob_t domain are the
following:
/etc/cron.d(/.*)?, /var/spool/anacron(/.*)?, /etc/crontab,
/var/spool/fcron/systab, /var/spool/fcron/new.systab,
/var/spool/fcron/systab.orig, all files on the system, /dev/cpu/mtrr,
/bin/d?ash, /bin/zsh.*, /bin/ksh.*, /usr/bin/d?ash, /usr/bin/zsh.*,
/usr/bin/ksh.*, /bin/esh, /bin/mksh, /bin/sash, /bin/tcsh, /bin/yash,
/bin/bash, /bin/fish, /bin/bash2, /usr/bin/esh, /usr/bin/sash,
/usr/bin/tcsh, /usr/bin/yash, /usr/bin/fish, /usr/bin/mksh,
/usr/bin/bash, /sbin/nologin, /usr/sbin/sesh, /usr/bin/bash2,
/usr/sbin/smrsh, /usr/bin/scponly, /usr/sbin/nologin,
/usr/libexec/sesh, /usr/sbin/scponlyc, /usr/bin/git-shell,
/usr/libexec/git-core/git-shell, /usr/sbin/anacron
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
system_cronjob policy is very flexible allowing users to setup their
system_cronjob processes in as secure a method as possible.
The following process types are defined for system_cronjob:
system_cronjob_t
Note: semanage permissive -a system_cronjob_t can be used to make the
process type system_cronjob_t permissive. SELinux does not deny access
to permissive process types, but the AVC (SELinux denials) messages are
still generated.
BOOLEANS
SELinux policy is customizable based on least access required. sys‐
tem_cronjob policy is extremely flexible and has several booleans that
allow you to manipulate the policy and run system_cronjob with the
tightest access possible.
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 authlo‐
gin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 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.
Enabled by default.
setsebool -P cron_can_relabel 1
If you want to allow all daemons to write corefiles to /, you must turn
on the daemons_dump_core boolean. Disabled by default.
setsebool -P daemons_dump_core 1
If you want to enable cluster mode for daemons, you must turn on the
daemons_enable_cluster_mode boolean. Enabled by default.
setsebool -P daemons_enable_cluster_mode 1
If you want to allow all daemons to use tcp wrappers, you must turn on
the daemons_use_tcp_wrapper boolean. Disabled by default.
setsebool -P daemons_use_tcp_wrapper 1
If you want to allow all daemons the ability to read/write terminals,
you must turn on the daemons_use_tty boolean. Disabled by default.
setsebool -P daemons_use_tty 1
If you want to deny user domains applications to map a memory region as
both executable and writable, this is dangerous and the executable
should be reported in bugzilla, you must turn on the deny_execmem bool‐
ean. Enabled by default.
setsebool -P deny_execmem 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 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 enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 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 control the ability to mmap a low area of the address
space, as configured by /proc/sys/kernel/mmap_min_addr, you must turn
on the mmap_low_allowed boolean. Disabled by default.
setsebool -P mmap_low_allowed 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. Disabled by default.
setsebool -P nscd_use_shm 1
If you want to disable kernel module loading, you must turn on the
secure_mode_insmod boolean. Enabled by default.
setsebool -P secure_mode_insmod 1
If you want to boolean to determine whether the system permits loading
policy, setting enforcing mode, and changing boolean values. Set this
to true and you have to reboot to set it back, you must turn on the
secure_mode_policyload boolean. Enabled by default.
setsebool -P secure_mode_policyload 1
If you want to allow unconfined executables to make their heap memory
executable. Doing this is a really bad idea. Probably indicates a
badly coded executable, but could indicate an attack. This executable
should be reported in bugzilla, you must turn on the selin‐
uxuser_execheap boolean. Disabled by default.
setsebool -P selinuxuser_execheap 1
If you want to allow all unconfined executables to use libraries
requiring text relocation that are not labeled textrel_shlib_t, you
must turn on the selinuxuser_execmod boolean. Enabled by default.
setsebool -P selinuxuser_execmod 1
If you want to allow unconfined executables to make their stack exe‐
cutable. This should never, ever be necessary. Probably indicates a
badly coded executable, but could indicate an attack. This executable
should be reported in bugzilla, you must turn on the selinuxuser_exec‐
stack boolean. Enabled by default.
setsebool -P selinuxuser_execstack 1
If you want to support X userspace object manager, you must turn on the
xserver_object_manager boolean. Enabled by default.
setsebool -P xserver_object_manager 1
If you want to allow ZoneMinder to run su/sudo, you must turn on the
zoneminder_run_sudo boolean. Disabled by default.
setsebool -P zoneminder_run_sudo 1
NSSWITCH DOMAIN
If you want to allow users to resolve user passwd entries directly from
ldap rather then using a sssd server for the system_cronjob_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
system_cronjob_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
MANAGED FILES
The SELinux process type system_cronjob_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 per‐
missions.
file_type
all files on the system
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 auto-generated using sepolicy manpage .
SEE ALSOselinux(8), system_cronjob(8), semanage(8), restorecon(8), chcon(1),
sepolicy(8) , setsebool(8)system_cronjob 14-05-08 system_cronjob_selinux(8)
