[Security] Disable unused background services: wpa_supplicant and cups.

Signed-off-by: Giacomo Marciani <mgiacomo@amazon.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ This file is used to list changes made in each version of the AWS ParallelCluste
 ------
 
 **ENHANCEMENTS**
+- Disable unused background services wpa_supplicant and cups to improve security.
 
 **CHANGES**
 

cookbooks/aws-parallelcluster-platform/recipes/install/disable_services.rb

@@ -27,3 +27,13 @@
 service 'log4j-cve-2021-44228-hotpatch' do
   action %i(disable stop mask)
 end unless on_docker?
+
+# Necessary on Ubuntu and Amazon Linux 2
+service 'cups' do
+  action %i(disable stop mask)
+end unless on_docker?
+
+# Necessary on Ubuntu 22
+service 'wpa_supplicant' do
+  action %i(disable stop mask)
+end unless on_docker?

cookbooks/aws-parallelcluster-platform/spec/unit/recipes/disable_services_spec.rb

@@ -18,6 +18,18 @@
         is_expected.to stop_service('log4j-cve-2021-44228-hotpatch')
         is_expected.to mask_service('log4j-cve-2021-44228-hotpatch')
       end
+
+      it 'disables cups' do
+        is_expected.to disable_service('cups')
+        is_expected.to stop_service('cups')
+        is_expected.to mask_service('cups')
+      end
+
+      it 'disables wpa_supplicant' do
+        is_expected.to disable_service('wpa_supplicant')
+        is_expected.to stop_service('wpa_supplicant')
+        is_expected.to mask_service('wpa_supplicant')
+      end
     end
   end
 end

cookbooks/aws-parallelcluster-platform/test/controls/disable_services_spec.rb

@@ -10,38 +10,46 @@
 # See the License for the specific language governing permissions and limitations under the License.
 
 control 'tag:testami_tag:config_services_disabled_on_debian_family' do
-  title 'Test that DLAMI multi eni helper is disabled and masked on debian family'
+  services = %w(aws-ubuntu-eni-helper wpa_supplicant)
+
+  title "Test that #{services.join(',')} are disabled and masked on debian family"
 
   only_if { os_properties.debian_family? && !os_properties.on_docker? }
 
-  describe service('aws-ubuntu-eni-helper') do
-    it { should_not be_enabled }
-    it { should_not be_running }
-  end
+  services.each do |service_name|
+    describe service(service_name) do
+      it { should_not be_enabled }
+      it { should_not be_running }
+    end
 
-  describe bash('systemctl list-unit-files --state=masked --no-legend') do
-    its(:exit_status) { should eq 0 }
-    its(:stdout) { should match /aws-ubuntu-eni-helper.service\s*masked/ }
+    describe bash('systemctl list-unit-files --state=masked --no-legend') do
+      its(:exit_status) { should eq 0 }
+      its(:stdout) { should match /#{service_name}.service\s*masked/ }
+    end
   end
 end
 
 control 'tag:testami_tag:config_services_disabled_on_amazon_family' do
-  title 'Test that log4j-cve-2021-44228-hotpatch is disabled and masked on amazon family'
+  services = %w(log4j-cve-2021-44228-hotpatch cups)
 
-  only_if { os_properties.amazon_family? && !os_properties.on_docker? }
+  title "Test that #{services.join(',')} are disabled and masked on amazon family"
 
-  describe service('log4j-cve-2021-44228-hotpatch') do
-    it { should_not be_enabled }
-    it { should_not be_running }
-  end
-
-  describe bash('systemctl list-unit-files --state=masked --no-legend') do
-    its(:exit_status) { should eq 0 }
-    its(:stdout) { should match /log4j-cve-2021-44228-hotpatch.service\s*masked/ }
-  end
+  only_if { os_properties.amazon_family? && !os_properties.on_docker? }
 
-  describe bash('systemctl show -p LoadState log4j-cve-2021-44228-hotpatch') do
-    its(:exit_status) { should eq 0 }
-    its(:stdout) { should match /LoadState=masked/ }
+  services.each do |service_name|
+    describe service(service_name) do
+      it { should_not be_enabled }
+      it { should_not be_running }
+    end
+
+    describe bash('systemctl list-unit-files --state=masked --no-legend') do
+      its(:exit_status) { should eq 0 }
+      its(:stdout) { should match /#{service_name}.service\s*masked/ }
+    end
+
+    describe bash("systemctl show -p LoadState #{service_name}") do
+      its(:exit_status) { should eq 0 }
+      its(:stdout) { should match /LoadState=masked/ }
+    end
   end
 end

cookbooks/aws-parallelcluster-slurm/spec/unit/recipes/config_slurmd_systemd_service_spec.rb

@@ -0,0 +1,66 @@
+require 'spec_helper'
+
+describe 'aws-parallelcluster-slurm::config_head_node' do
+  for_all_oses do |platform, version|
+    context "on #{platform}#{version}" do
+      cached(:chef_run) do
+        runner = runner(platform: platform, version: version) do
+          allow_any_instance_of(Object).to receive(:are_mount_or_unmount_required?).and_return(false)
+          allow_any_instance_of(Object).to receive(:dig).and_return(true)
+          RSpec::Mocks.configuration.allow_message_expectations_on_nil = true
+        end
+        runner.converge(described_recipe)
+      end
+      cached(:node) { chef_run.node }
+
+      it 'creates the slurmdbd configuration files' do
+        slurm_install_dir = "#{node['cluster']['slurm']['install_dir']}"
+        slurm_user  = "#{node['cluster']['slurm']['user']}"
+        slurm_group = "#{node['cluster']['slurm']['group']}"
+        is_expected.to create_template_if_missing("#{slurm_install_dir}/etc/slurmdbd.conf").with(
+          source: 'slurm/slurmdbd.conf.erb',
+          user: slurm_user,
+          group: slurm_group,
+          mode:  '0600'
+        )
+        is_expected.to create_file("#{slurm_install_dir}/etc/slurm_parallelcluster_slurmdbd.conf").with(
+          user: slurm_user,
+          group: slurm_group,
+          mode:  '0600'
+        )
+      end
+
+      it 'creates the Slurm database password update script' do
+        is_expected.to create_template("#{node['cluster']['scripts_dir']}/slurm/update_slurm_database_password.sh").with(
+          source: 'slurm/head_node/update_slurm_database_password.sh.erb',
+          user: 'root',
+          group: 'root',
+          mode:  '0700'
+        )
+      end
+
+      it 'executes the Slurm database password update scripts' do
+        is_expected.to run_execute("update Slurm database password").with(
+          command: "#{node['cluster']['scripts_dir']}/slurm/update_slurm_database_password.sh",
+          user: "root",
+          group: "root"
+        )
+      end
+
+      it 'starts the slurm database daemon' do
+        is_expected.to enable_service("slurmdbd")
+        is_expected.to start_service("slurmdbd")
+      end
+
+      it "waits for the Slurm database to respond" do
+        is_expected.to run_execute("wait for slurm database").with(
+          command: "#{node['cluster']['slurm']['install_dir']}/bin/sacctmgr show clusters -Pn"
+        )
+      end
+
+      it "bootstraps the Slurm database idempotently" do
+        is_expected.to run_bash("bootstrap slurm database")
+      end
+    end
+  end
+end