Content-type: text/html Manpage of tftpd_selinux

tftpd_selinux

Section: tftpd SELinux Policy documentation (8)
Updated: tftpd
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NAME

tftpd_selinux - Security Enhanced Linux Policy for the tftpd processes

DESCRIPTION

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

NSSWITCH DOMAIN

If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the tftpd_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 tftpd_t, you must turn on the kerberos_enabled boolean.

setsebool -P kerberos_enabled 1

SHARING FILES

If you want to share files with multiple domains (Apache, FTP, rsync, Samba), you can set a file context of public_content_t and public_content_rw_t. These context allow any of the above domains to read the content. If you want a particular domain to write to the public_content_rw_t domain, you must set the appropriate boolean.

Allow tftpd servers to read the /var/tftpd directory by adding the public_content_t file type to the directory and by restoring the file type.

semanage fcontext -a -t public_content_t "/var/tftpd(/.*)?"
restorecon -F -R -v /var/tftpd

Allow tftpd servers to read and write /var/tmp/incoming by adding the public_content_rw_t type to the directory and by restoring the file type. This also requires the allow_tftpdd_anon_write boolean to be set.

semanage fcontext -a -t public_content_rw_t "/var/tftpd/incoming(/.*)?"
restorecon -F -R -v /var/tftpd/incoming

If you want to allow tftp to modify public files used for public file transfer services., you must turn on the tftp_anon_write boolean.

setsebool -P tftp_anon_write 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 lsP Policy governs the access confined processes have to these files. SELinux tftpd policy is very flexible allowing users to setup their tftpd processes in as secure a method as possible.

The following file types are defined for tftpd:

tftpd_etc_t

- Set files with the tftpd_etc_t type, if you want to store tftpd files in the /etc directories.

tftpd_exec_t

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

Paths:: /usr/sbin/in.tftpd, /usr/sbin/atftpd

tftpd_var_run_t

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

tftpdir_rw_t

- Set files with the tftpdir_rw_t type, if you want to treat the files as tftpdir read/write content.

tftpdir_t

- Set files with the tftpdir_t type, if you want to treat the files as tftpdir data.

Paths:: /tftpboot/.*, /tftpboot

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

The following port types are defined for tftpd:

tftp_port_t

Default Defined Ports: udp 69

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 psP Policy governs the access confined processes have to files. SELinux tftpd policy is very flexible all

This document was created by man2html, using the manual pages.
Time: 19:35:43 GMT, September 30, 2012