Content-type: text/html Manpage of guest_selinux

guest_selinux

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

guest_u - Least privledge terminal user role - Security Enhanced Linux Policy

 

DESCRIPTION

guest_u is an SELinux User defined in the SELinux policy. SELinux users have default roles, guest_r. The default role has a default type, guest_t, associated with it.

The SELinux user will usually login to a system with a context that looks like:

guest_u:guest_r:guest_t:s0-s0:c0.c1023

Linux users are automatically assigned an SELinux users at login. Login programs use the SELinux User to assign initial context to the user's shell.

SELinux policy uses the context to control the user's access.

By default all users are assigned to the SELinux user via the __default__ flag

On Targeted policy systems the __default__ user is assigned to the unconfined_u SELinux user.

You can list all Linux User to SELinux user mapping using:

semanage login -l

If you wanted to change the default user mapping to use the guest_u user, you would execute:

semanage login -m -s guest_u __default__

If you want to map the one Linux user (joe) to the SELinux user guest, you would execute:

$ semanage login -a -s guest_u joe

 

USER DESCRIPTION

The SELinux user guest_u is defined in policy as a unprivileged user. SELinux prevents unprivileged users from doing administration tasks without transitioning to a different role.

 

SUDO

 

X WINDOWS LOGIN

The SELinux user guest_u is not able to X Windows login.

 

NETWORK

The SELinux user guest_u is able to connect to the following tcp ports.

dns_port_t: 53

ocsp_port_t: 9080

kerberos_port_t: 88,750,4444

The SELinux user guest_u is able to connect to the following tcp ports.

dns_port_t: 53

ocsp_port_t: 9080

kerberos_port_t: 88,750,4444

 

BOOLEANS

SELinux policy is customizable based on least access required. guest policy is extremely flexible and has several booleans that allow you to manipulate the policy and run guest with the tightest access possible.

If you want to allow xguest users to configure Network Manager and connect to apache ports, you must turn on the xguest_connect_network boolean.

setsebool -P xguest_connect_network 1

If you want to allow xguest users to mount removable media, you must turn on the xguest_mount_media boolean.

setsebool -P xguest_mount_media 1

If you want to allow xguest to use blue tooth devices, you must turn on the xguest_use_bluetooth boolean.

setsebool -P xguest_use_bluetooth 1

 

HOME_EXEC

The SELinux user guest_u is able execute home content files.

 

TRANSITIONS

Three things can happen when guest_t attempts to execute a program.

1. SELinux Policy can deny guest_t from executing the program.

2. SELinux Policy can allow guest_t to execute the program in the current user type.

Execute the following to see the types that the SELinux user guest_t can execute without transitioning:

sesearch -A -s guest_t -c file -p execute_no_trans

3. SELinux can allow guest_t to execute the program and transition to a new type.

Execute the following to see the types that the SELinux user guest_t can execute and transition:

$ sesearch -A -s guest_t -c process -p transition

 

MANAGED FILES

The SELinux user type guest_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.


anon_inodefs_t


auth_cache_t

        /var/cache/coolkey(/.*)?


httpd_user_content_t

        /home/[^/]*/((www)|(web)|(public_html))(/.+)?


httpd_user_htaccess_t

        /home/[^/]*/((www)|(web)|(public_html))(/.*)?/.htaccess


httpd_user_ra_content_t

        /home/[^/]*/((www)|(web)|(public_html))(/.*)?/logs(/.*)?


httpd_user_rw_content_t


httpd_user_script_exec_t

        /home/[^/]*/((www)|(web)|(public_html))/cgi-bin(/.+)?


user_home_type

        


 

Index

NAME
DESCRIPTION
USER DESCRIPTION
SUDO
X WINDOWS LOGIN
NETWORK
BOOLEANS
HOME_EXEC
TRANSITIONS
MANAGED FILES

This document was created by man2html, using the manual pages.
Time: 19:31:46 GMT, September 30, 2012