rpms/selinux-policy
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Add a systemd service to check that SELinux is disabled properly

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As an additional sanity check to support the removal of runtime
disabling of SELinux [1], add a simple oneshot service to the
selinux-policy package that will print a warning to system journal when
it detects on boot that the system has been booted with SELINUX=disabled
in /etc/selinux/config, but without selinux=0 on the kernel command
line.

Note that as per [2], in order for the service to be enabled by default,
it needs to be added to the Fedora presets.

[1] https://fedoraproject.org/wiki/Changes/Remove_Support_For_SELinux_Runtime_Disable
[2] https://docs.fedoraproject.org/en-US/packaging-guidelines/DefaultServices/#_how_to_enable_a_service_by_default

Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
This commit is contained in:
Ondrej Mosnacek 2021-05-13 16:23:31 +02:00 committed by zpytela
parent a563172755
commit fd69433906
2 changed files with 27 additions and 0 deletions
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15
selinux-check-proper-disable.service Normal file
View File

@ -0,0 +1,15 @@
[Unit]
Description=Check that SELinux is not disabled the unsafe way
ConditionKernelCommandLine=!selinux=0
After=sysinit.target
[Service]
Type=oneshot
EnvironmentFile=/etc/selinux/config
ExecCondition=test "$SELINUX" = disabled
ExecStart=/usr/bin/echo 'SELINUX=disabled in /etc/selinux/config, but no selinux=0 on kernel command line - SELinux may not be fully disabled. Please update bootloader configuration to pass selinux=0 to kernel at boot.'
StandardOutput=journal+console
SyslogLevel=warning
[Install]
WantedBy=multi-user.target

12
selinux-policy.spec
View File

@ -59,6 +59,8 @@ Source33: macro-expander
# Git repo: https://github.com/containers/container-selinux.git
Source35: container-selinux.tgz
Source36: selinux-check-proper-disable.service
# Provide rpm macros for packages installing SELinux modules
Source102: rpm.macros
@ -66,6 +68,7 @@ Url: %{giturl}
BuildArch: noarch
BuildRequires: python3 gawk checkpolicy >= %{CHECKPOLICYVER} m4 policycoreutils-devel >= %{POLICYCOREUTILSVER} bzip2
BuildRequires: make
BuildRequires: systemd-rpm-macros
Requires(pre): policycoreutils >= %{POLICYCOREUTILSVER}
Requires(post): /bin/awk /usr/bin/sha512sum
Requires: rpm-plugin-selinux
@ -88,6 +91,7 @@ the policy has been adjusted to provide support for Fedora.
%ghost %{_sysconfdir}/sysconfig/selinux
%{_usr}/lib/tmpfiles.d/selinux-policy.conf
%{_rpmconfigdir}/macros.d/macros.selinux-policy
%{_unitdir}/selinux-check-proper-disable.service
%package sandbox
Summary: SELinux sandbox policy
@ -480,9 +484,13 @@ install -m 644 %{SOURCE102} %{buildroot}%{_rpmconfigdir}/macros.d/macros.selinux
sed -i 's/SELINUXPOLICYVERSION/%{version}-%{release}/' %{buildroot}%{_rpmconfigdir}/macros.d/macros.selinux-policy
sed -i 's@SELINUXSTOREPATH@%{_sharedstatedir}/selinux@' %{buildroot}%{_rpmconfigdir}/macros.d/macros.selinux-policy
mkdir -p %{buildroot}%{_unitdir}
install -m 644 %{SOURCE36} %{buildroot}%{_unitdir}
rm -rf selinux_config
%post
%systemd_post selinux-check-proper-disable.service
if [ ! -s %{_sysconfdir}/selinux/config ]; then
#
# New install so we will default to targeted policy
@ -524,7 +532,11 @@ else
fi
exit 0
%preun
%systemd_preun selinux-check-proper-disable.service
%postun
%systemd_postun selinux-check-proper-disable.service
if [ $1 = 0 ]; then
%{_sbindir}/setenforce 0 2> /dev/null
if [ ! -s %{_sysconfdir}/selinux/config ]; then