ntpd_selinux(8) ntpd SELinux Policy documentation ntpd_selinux(8)NAMEntpd_selinux - Security Enhanced Linux Policy for the ntpd processes
DESCRIPTION
Security-Enhanced Linux secures the ntpd processes via flexible manda‐
tory access control.
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the ntpd_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
ntpd_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 ntpd_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 ntpd policy is very flexible allowing users to setup their ntpd
processes in as secure a method as possible.
The following file types are defined for ntpd:
ntpd_exec_t
- Set files with the ntpd_exec_t type, if you want to transition an
executable to the ntpd_t domain.
Paths:
/usr/sbin/ntpd, /etc/cron.(daily|weekly)/ntp-server,
/etc/cron.(daily|weekly)/ntp-simple
ntpd_initrc_exec_t
- Set files with the ntpd_initrc_exec_t type, if you want to transition
an executable to the ntpd_initrc_t domain.
ntpd_key_t
- Set files with the ntpd_key_t type, if you want to treat the files as
ntpd key data.
Paths:
/etc/ntp/crypto(/.*)?, /etc/ntp/keys
ntpd_log_t
- Set files with the ntpd_log_t type, if you want to treat the data as
ntpd log data, usually stored under the /var/log directory.
Paths:
/var/log/ntpstats(/.*)?, /var/log/xntpd.*, /var/log/ntp.*
ntpd_tmp_t
- Set files with the ntpd_tmp_t type, if you want to store ntpd tempo‐
rary files in the /tmp directories.
ntpd_tmpfs_t
- Set files with the ntpd_tmpfs_t type, if you want to store ntpd files
on a tmpfs file system.
ntpd_unit_file_t
- Set files with the ntpd_unit_file_t type, if you want to treat the
files as ntpd unit content.
ntpd_var_run_t
- Set files with the ntpd_var_run_t type, if you want to store the ntpd
files under the /run directory.
ntpdate_exec_t
- Set files with the ntpdate_exec_t type, if you want to transition an
executable to the ntpdate_t domain.
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.
PORT TYPES
SELinux defines port types to represent TCP and UDP ports.
You can see the types associated with a port by using the following
command:
semanage port -l
Policy governs the access confined processes have to these ports.
SELinux ntpd policy is very flexible allowing users to setup their ntpd
processes in as secure a method as possible.
The following port types are defined for ntpd:
ntp_port_t
Default Defined Ports:
udp 123
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
ntpd policy is very flexible allowing users to setup their ntpd pro‐
cesses in as secure a method as possible.
The following process types are defined for ntpd:
ntpd_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 port can also be used to manipulate the port definitions
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), ntpd(8), semanage(8), restorecon(8), chcon(1)dwalsh@redhat.com ntpd ntpd_selinux(8)
