plautrba.fedorapeople.org
plautrba.fedorapeople.org

SELinux confined system with Fedora 27 =

in SELinux

Run Fedora 27 without unconfined_t

Goal

All processes run with a confined domain.

Setup

^_^ semanage login -l
Login Name           SELinux User         MLS/MCS Range        Service
__default__          staff_u              s0-s0:c0.c1023       *
plautrba             staff_u              s0-s0:c0.c1023       *
root                 root                 s0-s0:c0.c1023       *
^_^ semanage user -l | grep staff_u
staff_u   user   s0   s0-s0:c0.c1023   secadm_r staff_r sysadm_r system_r unconfined_r
^_^ semanage boolean -l -C
SELinux boolean                State  Default Description
selinuxuser_tcp_server         (on   ,   on)  Allow users to run TCP servers (bind to ports and accept connection from the same domain and outside users)  disabling this forces FTP passive mode and may change other protocols.
staff_use_svirt                (on   ,   on)  allow staff user to create and transition to svirt domains.
xserver_execmem                (on   ,   on)  Allows XServer to execute writable memory
^_^ cat /etc/sudoers.d/selinux
%wheel    ALL=(ALL)  TYPE=sysadm_t ROLE=sysadm_r    ALL
%wheel    ALL=(ALL)  TYPE=secadm_t ROLE=secadm_r    /usr/local/bin/zsh-secadm
%wheel    ALL=(ALL)  TYPE=secadm_t ROLE=secadm_r    /usr/sbin/semanage,/usr/sbin/semodule

Missing rules

A lot - myconfined.cil ;)

^_^ wc -l myconfined.cil
119 myconfined.cil

Current state

^_^ getenforce
Enforcing

Confined users

^_^ id -Z
staff_u:staff_r:staff_t:s0-s0:c0.c1023
^_^ sudo -i
^_^ id -Z
staff_u:sysadm_r:sysadm_t:s0-s0:c0.c1023

Confined processes

^_^ ps Z
LABEL                             PID  TTY         STAT   TIME COMMAND
staff_u:staff_r:staff_t:s0-s0:c0.c1023 2401  pts/2  Ss   0:00 /usr/bin/zsh
staff_u:sysadm_r:ssh_t:s0-s0:c0.c1023  10526 pts/12 S+   0:00 ssh localhost
staff_u:staff_r:staff_t:s0-s0:c0.c1023 10605 pts/11 S+   0:00 vim Fully-SELinux-confined-system-with-Fedora-27.adoc
staff_u:staff_r:staff_screen_t:s0-s0:c0.c1023 14770 pts/4 S+   0:00 tmux new-session -s openscap
staff_u:staff_r:staff_t:s0-s0:c0.c1023 18754 pts/9  S+   0:02 vim src/OVAL/probes/unix/process58.c
staff_u:staff_r:staff_t:s0-s0:c0.c1023 25788 pts/10 S+   0:00 cscope -R
staff_u:staff_r:staff_t:s0-s0:c0.c1023 26368 pts/10 S+   0:00 vim +85 libselinux/src/ccntext.c
^_^ ps axZ | grep unconfined
staff_u:staff_r:staff_t:s0-s0:c0.c1023 13740 pts/12 S+   0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn unconfined

unconfined module disabled

^_^ sudo semodule -lfull | grep unconfined
100 unconfined        pp disabled
100 unconfineduser    pp

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