Use boolean settings to modify system SELinux settings

In order to list the SELinux settings you can use this command:

getsebool -a

Since SELinux settings don't really have catchy names, your best bet is using grep in conjunction with the -a switch, e.g to find all SELinux settings related to ssh: 

getsebool -a | grep ssh

You can now use the setsebool command to change the settings like this:

setsebool -P selinuxsetting boolean

where boolean is 1 to switch on and 0 to switch off.

Alternatively, you could you use tooglesebool, which flips the value.
e.g.

[root@centos1 examples]# getsebool -a | grep virt_use_nfs
virt_use_nfs --> off
[root@centos1 examples]# togglesebool virt_use_nfs
virt_use_nfs: active
[root@centos1 examples]# getsebool -a | grep virt_use_nfs
virt_use_nfs --> on