Capítulo 6. Confinando a los Usuarios

6.1. Linux y los Mapeos de Usuarios de SELinux
6.2. Confinando Usuarios Nuevos de Linux: useradd
6.3. Confinando Usuarios Linux Existentes: semanage login
6.4. Cambiando el Mapeo Predeterminado
6.5. xguest: Modo Kiosk
6.6. Booleanos para que los Usuarios Ejecuten Aplicaciones

A number of confined SELinux users are available in Fedora 13. Each Linux user is mapped to an SELinux user via SELinux policy, allowing Linux users to inherit the restrictions placed on SELinux users, for example (depending on the user), not being able to: run the X Window System; use networking; run setuid applications (unless SELinux policy permits it); or run the su and sudo commands. This helps protect the system from the user. Refer to Sección 4.3, “Usuarios Confinados y no Confinados” for further information about confined users.

6.1. Linux y los Mapeos de Usuarios de SELinux

Como usuario root de Linux, corra el comando semanage login -l para ver el mapeo entre los usuarios de Linux y los usuarios de SELinux:

# /usr/sbin/semanage login -l

Login Name                SELinux User              MLS/MCS Range

__default__               unconfined_u              s0-s0:c0.c1023
root                      unconfined_u              s0-s0:c0.c1023
system_u                  system_u                  s0-s0:c0.c1023

In Fedora 13, Linux users are mapped to the SELinux __default__ login by default (which is in turn mapped to the SELinux unconfined_u user). When a Linux user is created with the useradd command, if no options are specified, they are mapped to the SELinux unconfined_u user. The following defines the default-mapping:

__default__               unconfined_u              s0-s0:c0.c1023