SELinux examples

1. Commands and files:

getenforce, setenforce - get and set SELinux mode: Enforcing, Permissive, Disabled.
/etc/selinux/targeted/contexts/files/file_contexts - default settings for files and directories.

2. SELinux and Samba

Get available options for Samba:

$ ls /selinux/booleans/ | grep -e samba -e smb
allow_smbd_anon_write
samba_domain_controller
samba_enable_home_dirs
samba_export_all_ro
samba_export_all_rw
samba_share_fusefs
samba_share_nfs
smbd_disable_trans
use_samba_home_dirs
virt_use_samba

Allow remote access to home directory:

setsebool -P samba_enable_home_dirs 1

Other directory use option public_content_rw_t. The same as for /var/ftp:

$ ls -Z /var/ftp
drwxr-xr-x root root system_u:object_r:public_content_t pub

Only reading access:

chcon -R -t public_content_rw_t /myshara/

For write access:

setsebool -P allow_smbd_anon_write 1

Another way:
SELinux for FTP and SAMBA servers:

semanage fcontext --add --type public_content_t '/srv/ftp(/.*)?'
mkdir -p /srv/ftp
restorecon /srv/ftp
semanage fcontext --add --type samba_var_t '/srv/samba(/.*)?'
mkdir -p /srv/samba
restorecon /srv/samba
ls -Z /srv
drwxr-xr-x root root system_u:object_r:public_content_t:s0 ftp
drwxr-xr-x root root system_u:object_r:httpd_sys_content_t:s0 http
drwxr-xr-x root root system_u:object_r:samba_var_t:s0 samba

3. GUI tools SELinux

yum search selinux
yum install policycoreutils-gui

You can find System > Administration > SELinux Management

yum install setroubleshoot

You can find Applications > System Tools > SELinux Troubleshooter