telnetd_selinux(8) - Linux man page

Name

telnetd_selinux - Security Enhanced Linux Policy for the telnetd processes

Description

Security-Enhanced Linux secures the telnetd processes via flexible mandatory access control.

The telnetd processes execute with the telnetd_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 telnetd_t

Entrypoints

The telnetd_t SELinux type can be entered via the "telnetd_exec_t" file type. The default entrypoint paths for the telnetd_t domain are the following:"

/usr/sbin/in.telnetd, /usr/kerberos/sbin/telnetd

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 telnetd policy is very flexible allowing users to setup their telnetd processes in as secure a method as possible.

The following process types are defined for telnetd:

telnetd_t

Note: semanage permissive -a telnetd_t

can be used to make the process type telnetd_t permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.

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 telnetd policy is very flexible allowing users to setup their telnetd processes in as secure a method as possible.

The following file types are defined for telnetd:

telnetd_exec_t

- Set files with the telnetd_exec_t type, if you want to transition an executable to the telnetd_t domain.

telnetd_keytab_t

- Set files with the telnetd_keytab_t type, if you want to treat the files as kerberos keytab files.

telnetd_tmp_t

- Set files with the telnetd_tmp_t type, if you want to store telnetd temporary files in the /tmp directories.

telnetd_var_run_t

- Set files with the telnetd_var_run_t type, if you want to store the telnetd files under the /run directory.

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.

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 telnetd policy is very flexible allowing users to setup their telnetd processes in as secure a method as possible.

The following port types are defined for telnetd:

telnetd_port_t
Default Defined Ports:: tcp 23

Managed Files

The SELinux process type telnetd_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.

initrc_tmp_t

initrc_var_run_t

/var/run/utmp

/var/run/random-seed

/var/run/runlevel.dir

/var/run/setmixer_flag

krb5_host_rcache_t

/var/cache/krb5rcache(/.*)?

/var/tmp/host_0

/var/tmp/HTTP_23

mnt_t

/mnt(/[^/]*)

/mnt(/[^/]*)?

/rhev(/[^/]*)?

/media(/[^/]*)

/media(/[^/]*)?

/etc/rhgb(/.*)?

/media/.hal-.*

/net

/afs

/misc

/rhev

security_t
telnetd_tmp_t
telnetd_var_run_t
tmp_t

/tmp

/usr/tmp

/var/tmp

/var/tmp/vi.recover

wtmp_t

/var/log/wtmp.*

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 policy modules.

semanage port can also be used to manipulate the port definitions

system-config-selinux is a GUI tool available to customize SELinux policy settings.

Author

This manual page was auto-generated using sepolicy manpage by mgrepl.