tftpd_selinux(8) tftpd SELinux Policy documentation tftpd_selinux(8)NAMEtftpd_selinux - Security Enhanced Linux Policy for the tftpd processes
DESCRIPTION
Security-Enhanced Linux secures the tftpd processes via flexible manda‐
tory access control.
NSSWITCH DOMAIN
If you want to allow users to login 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 allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the tftpd_t, you must
turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 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_con‐
tent_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_con‐
tent_rw_t domain, you must set the appropriate boolean.
Allow tftpd servers to read the /var/tftpd directory by adding the pub‐
lic_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 ls
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 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 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 ps
Policy governs the access confined processes have to files. SELinux
tftpd policy is very flexible allowing users to setup their tftpd pro‐
cesses in as secure a method as possible.
The following process types are defined for tftpd:
tftpd_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), tftpd(8), semanage(8), restorecon(8), chcon(1)dwalsh@redhat.com tftpd tftpd_selinux(8)
