Merge pull request #5463 from inspec/vasundhara/add_selinux_modules

Add selinux resource support for modules and booleans

docs-chef-io/content/inspec/resources/selinux.md

@@ -11,9 +11,9 @@ platform = "linux"
     parent = "inspec/resources/os"
 +++
 
-Use the `selinux` Chef InSpec audit resource to test the state and mode of SELinux policy.
+Use the `selinux` Chef InSpec audit resource to test the configuration data of the SELinux policy, SELinux modules and SELinux booleans.
 
-The `selinux` resource extracts and exposes data reported by the `sestatus` command.
+The `selinux` resource extracts and exposes data reported by the `sestatus`, `semodule -lfull`, and `semanage boolean -l -n` command.
 
 ## Availability
 
@@ -23,6 +23,8 @@ This resource is distributed along with Chef InSpec itself. You can use it autom
 
 ### Version
 
+This resource first became available in v4.35.1 of InSpec.
+
 ## Syntax
 
 The `selinux` Chef InSpec resource block tests the state and mode of SELinux policy.
@@ -34,23 +36,65 @@ The `selinux` Chef InSpec resource block tests the state and mode of SELinux pol
       it { should_not be_permissive }
     end
 
+The `selinux` resource block also allows you to write tests for multiple modules:
+
+    describe selinux.modules.where("zebra") do
+      it { should exist }
+      it { should be_installed }
+      it { should be_enabled }
+    end
+
+or:
+
+    describe selinux.modules.where(status: "installed") do
+      it { should exist }
+      its('count') { should cmp 404 }
+    end
+
+where:
+
+- `.where()` specifies the parameter and expected value.
+- `name`, `status`, `state`, and `priority` are valid parameters.
+
+The `selinux` resource block also allows you to write tests for multiple booleans:
+
+    describe selinux.booleans.where(name: "httpd_enable_homedirs") do
+      it { should_not be_on }
+    end
+
+or:
+
+    describe selinux.booleans.where(name: "xend_run_blktap", state: "on") do
+      it { should exist }
+      its('defaults') { should cmp "on" }
+    end
+
+- `.where()` specifies the parameter and expected value.
+- `name`, `state`, and `default` are valid parameters for `booleans`.
+
 ## Examples
 
 The following examples show how to use this Chef InSpec selinux resource.
 
 ### Test if SELinux is installed and enabled
 
-describe selinux do
-  it { should be_installed }
-  it { should_not be_disabled }
-end
+    describe selinux do
+      it { should be_installed }
+      it { should_not be_disabled }
+    end
 
 ### Test if SELinux is enabled and running in enforcing mode
 
-describe selinux do
-  it { should_not be_disabled }
-  it { should be_enforcing }
-end
+    describe selinux do
+      it { should_not be_disabled }
+      it { should be_enforcing }
+    end
+
+### Test the selinux policy type
+
+    describe selinux do
+      its('policy') { should eq "targeted"}
+    end
 
 ## Matchers
 
@@ -58,7 +102,7 @@ For a full list of available matchers, please visit our [matchers page](/inspec/
 
 ### be_installed
 
-The `be_installed` matcher tests if the SELinux is installed on the system:
+The `be_installed` matcher tests if the SElinux policy or SElinux modules are installed on the system:
 
     it { should be_installed }
 
@@ -79,3 +123,51 @@ The `be_enforcing` matcher tests if the SELinux mode is set to enforcing:
 The `be_permissive` matcher tests if the SELinux mode is set to permissive:
 
     it { should be_permissive }
+
+### be_on
+
+The `be_on` matcher tests if the SELinux boolean is on:
+
+    it { should be_on }
+
+### be_enabled
+
+The `be_enabled` matcher tests if the SElinux module is enabled:
+
+    it { should be_enabled }
+
+## Resource Parameters
+
+- `names`, `status`, `states`, and `priorities` are valid parameters for SELinux policy modules.
+
+- `names`, `status`, `states`, and `defaults` are valid parameters for SELinux `booleans`.
+
+## Resource Parameter Examples
+
+### modules
+
+`modules` returns information about SELinux modules using the [semodule -lfull](https://man7.org/linux/man-pages/man8/semodule.8.html) command.
+
+Note: The `semodule -l` command [does not provide version information](https://access.redhat.com/solutions/2760071) for newer versions of Linux-based systems like RHEL8 and Centos8, so we do not support that option.
+
+```ruby
+describe selinux.modules do
+  its("names") { should include "zebra" }
+  its("status") { should include "installed" }
+  its("states") { should include "enabled" }
+  its("priorities") { should include "100" }
+end
+```
+### booleans
+
+`booleans` returns information about SELinux booleans using the [semanage boolean -l -n](https://man7.org/linux/man-pages/man8/semanage-boolean.8.html) command.
+
+```ruby
+describe selinux.booleans do
+  its("names") { should include "httpd_enable_homedirs" }
+  its("states") { should include "on" }
+  its("states") { should include "off" }
+  its("defaults") { should include "on" }
+  its("defaults") { should include "off" }
+end
+```

lib/inspec/resources/selinux.rb

@@ -1,11 +1,54 @@
 require "inspec/resources/command"
+require "inspec/utils/filter"
 
 module Inspec::Resources
+  class SelinuxModuleFilter
+    # use filtertable for SELinux Modules
+    filter = FilterTable.create
+    filter.register_custom_matcher(:exists?) { |x| !x.entries.empty? }
+    filter.register_column(:names, field: :name)
+    filter.register_column(:status, field: :status)
+    filter.register_column(:states, field: :state)
+    filter.register_column(:priorities , field: :priority)
+    filter.register_custom_matcher(:enabled?) { |x| x.states[0] == "enabled" }
+    filter.register_custom_matcher(:installed?) { |x| x.status[0] == "installed" }
+    filter.install_filter_methods_on_resource(self, :modules)
+
+    attr_reader :modules
+    def initialize(modules)
+      @modules = modules
+    end
+
+    def to_s
+      "SELinux modules"
+    end
+  end
+
+  class SelinuxBooleanFilter
+    # use filtertable for SELinux Booleans
+    filter = FilterTable.create
+    filter.register_custom_matcher(:exists?) { |x| !x.entries.empty? }
+    filter.register_column(:names, field: :name)
+    filter.register_column(:states, field: :state)
+    filter.register_column(:defaults, field: :default)
+    filter.register_custom_matcher(:on?) { |x| x.states[0] == "on" }
+    filter.install_filter_methods_on_resource(self, :booleans)
+
+    attr_reader :booleans
+    def initialize(booleans)
+      @booleans = booleans
+    end
+
+    def to_s
+      "SELinux booleans"
+    end
+  end
+
   class Selinux < Inspec.resource(1)
     name "selinux"
     supports platform: "linux"
 
-    desc "Use selinux Inspec resource to test state/mode of the selinux policy."
+    desc "Use the selinux Chef InSpec resource to test the configuration data of the SELinux policy, SELinux modules, and SELinux booleans."
 
     example <<~EXAMPLE
       describe selinux do
@@ -14,6 +57,29 @@ module Inspec::Resources
         it { should be_permissive }
         it { should be_enforcing }
       end
+
+      describe selinux do
+        its('policy') { should eq "targeted"}
+      end
+
+      describe selinux.modules.where("zebra") do
+        it { should exist }
+        it { should be_installed }
+        it { should be_enabled }
+      end
+
+      describe selinux.modules.where(status: "installed") do
+        it { should exist }
+        its('count') { should cmp 404 }
+      end
+
+      describe selinux.booleans.where(name: "xend_run_blktap") do
+        it { should be_on }
+      end
+
+      describe selinux.booleans.where { name == "xend_run_blktap" && state == "on" } do
+       it { should exist }
+      end
     EXAMPLE
 
     def initialize(selinux_path = "/etc/selinux/config")
@@ -46,8 +112,43 @@ module Inspec::Resources
       @data["currentmode"] == "permissive"
     end
 
+    def policy
+      @data["loadedpolicyname"]
+    end
+
+    def modules
+      SelinuxModuleFilter.new(parse_modules)
+    end
+
+    def booleans
+      SelinuxBooleanFilter.new(parse_booleans)
+    end
+
     def to_s
       "SELinux"
     end
+
+    private
+
+    def parse_modules
+      raw_modules = inspec.command("semodule -lfull").stdout
+      r_modules = []
+      raw_modules.each_line do |entry|
+        data = entry.split.map(&:strip)
+        state = data.length == 4 ? data[3] : "enabled"
+        r_modules.push({ name: data[1], status: "installed", state: state, priority: data[0] })
+      end
+      r_modules
+    end
+
+    def parse_booleans
+      raw_booleans = inspec.command("semanage boolean -l -n").stdout
+      r_booleans = []
+      raw_booleans.each_line do |entry|
+        data = entry.scan(/([^(,)]+)/).flatten.map(&:strip)
+        r_booleans.push({ name: data[0], state: data[1], default: data[2] })
+      end
+      r_booleans
+    end
   end
 end

test/fixtures/cmd/semanage-boolean

@@ -0,0 +1,3 @@
+xen_use_nfs                    (off  ,  off)  Allow xen to use nfs
+xend_run_blktap                (on   ,   on)  Allow xend to run blktap
+zebra_write_config             (off  ,  off)  Allow zebra to write config

test/fixtures/cmd/semodule-lfull

@@ -0,0 +1,3 @@
+100 foo            pp
+100 bar            pp disabled
+100 baz            pp

test/helpers/mock_loader.rb

@@ -558,11 +558,15 @@ class MockLoader
       # filesystem command
       "2e7e0d4546342cee799748ec7e2b1c87ca00afbe590fa422a7c27371eefa88f0" => cmd.call("get-wmiobject-filesystem"),
       "sestatus" => cmd.call("sestatus"),
+      "semodule -lfull" => cmd.call("semodule-lfull"),
+      "semanage boolean -l -n" => cmd.call("semanage-boolean"),
     }
 
     if @platform && (@platform[:name] == "windows" || @platform[:name] == "freebsd")
       mock_cmds.merge!(
-          "sestatus" => empty.call
+          "sestatus" => empty.call,
+          "semodule -lfull" => empty.call,
+          "semanage boolean -l -n" => empty.call
         )
     end
 

test/unit/resources/selinux_test.rb

@@ -3,26 +3,29 @@ require "inspec/resource"
 require "inspec/resources/selinux"
 
 describe "Inspec::Resources::Selinux" do
+  let(:resource) { load_resource("selinux") }
+
   it "verify selinux is installed" do
     resource = load_resource("selinux", "/etc/selinux/selinux_conf")
     _(resource.installed?).must_equal true
   end
 
   it "verify selinux state - enforcing" do
-    resource = load_resource("selinux")
     _(resource.enforcing?).must_equal true
   end
 
   it "verify selinux state - permissive" do
-    resource = load_resource("selinux")
     _(resource.permissive?).must_equal false
   end
 
-  it "verify selinux disabled " do
-    resource = load_resource("selinux")
+  it "verify selinux disabled" do
     _(resource.disabled?).must_equal false
   end
 
+  it "verify selinux policy type is targeted" do
+    _(resource.policy).must_equal "targeted"
+  end
+
   it "verify selinux on linux" do
     resource = MockLoader.new(:linux).load_resource("selinux")
     _(resource.enforcing?).must_equal true
@@ -41,4 +44,25 @@ describe "Inspec::Resources::Selinux" do
     _(resource.installed?).must_equal false
     _(resource.enforcing?).must_equal false
   end
+
+  it "verify selinux.modules is exist" do
+    _(resource.modules.exist?).must_equal true
+  end
+
+  it "verify selinux.modules parsing" do
+    _(resource.modules.names).must_equal %w{foo bar baz}
+    _(resource.modules.states).must_equal %w{enabled disabled enabled}
+    _(resource.modules.status).must_equal %w{installed installed installed}
+    _(resource.modules.priorities).must_equal %w{100 100 100}
+  end
+
+  it "verify selinux.booleans is exist" do
+    _(resource.booleans.exist?).must_equal true
+  end
+
+  it "verify selinux.booleans parsing" do
+    _(resource.booleans.names).must_equal %w{xen_use_nfs xend_run_blktap zebra_write_config}
+    _(resource.booleans.states).must_equal %w{off on off}
+    _(resource.booleans.defaults).must_equal %w{off on off}
+  end
 end