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How to set SELinux boolean using custom policy?

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Oleg Neumyvakin

I know that SElinux booleans can be set via setsebool like this:

setsebool -P virt_qemu_ga_read_nonsecurity_files 1

But I want to set this boolean virt_qemu_ga_read_nonsecurity_files using custom SELinux policy.

Is it even possible? How can I do this?

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Christoph Dwertmann

A SELinux boolean is a switch to dynamically enable/disable a set of policies at runtime. If you want to enable the policies that this boolean enables without setting the boolean, you can implement the policies behind the boolean as a custom SELinux module and add it to your local policies.

Example:

  1. Create a file test.te:
policy_module(test, 1.0)
gen_require(`
    type virt_qemu_ga_t ;
')
files_read_non_security_files(virt_qemu_ga_t)
  1. yum -y install policycoreutils-devel
  2. make -f /usr/share/selinux/devel/Makefile test.pp
  3. semodule -i test.pp
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