add new parametrized platform os_linux

add associated template together with Ansible remediation.
Currently, only the OS name can be specified.

shared/applicability/os_linux.yml

@@ -0,0 +1,14 @@
+name: "cpe:/o:{arg}"
+title: "Operating System is {arg}"
+check_id: platform_os_linux_{arg}
+template:
+    name: platform_os_linux
+args:
+    rhel:
+        os_name: "Red Hat Enterprise Linux"
+        os_id: 'rhel'
+        os_id_ansible: "RedHat"
+    fedora:
+        os_name: "Fedora"
+        os_id: 'fedora'
+        os_id_ansible: "Fedora"

shared/templates/platform_os_linux/ansible.template

@@ -0,0 +1,2 @@
+{{%- set ansible_os_release_name_cond = 'ansible_distribution == "' + OS_ID_ANSIBLE + '"' -%}}
+  {{{ ansible_os_release_name_cond.strip() }}}

shared/templates/platform_os_linux/oval.template

@@ -0,0 +1,25 @@
+<def-group>
+  <definition class="inventory" id="platform_{{{ _RULE_ID }}}" version="1">
+    {{{ oval_metadata("The installed operating system is " + OS_NAME, affected_platforms=["multi_platform_all"]) }}}
+    <criteria operator="AND">
+      <criterion comment="The operating system installed on the system is {{{ OS_NAME }}}"
+      test_ref="test_os_id_is_{{{ ID }}}" />
+    </criteria>
+  </definition>
+
+  <ind:textfilecontent54_test check="all" comment="ID in os-release is {{{ OS_ID }}}" id="test_os_id_is_{{{ ID }}}" version="1">
+    <ind:object object_ref="obj_os_id_is_{{{ ID }}}" />
+    <ind:state state_ref="state_os_id_is_{{{ ID }}}" />
+  </ind:textfilecontent54_test>
+
+  <ind:textfilecontent54_object id="obj_os_id_is_{{{ ID }}}" version="1">
+    <ind:filepath>/etc/os-release</ind:filepath>
+    <ind:pattern operation="pattern match">^ID=[&quot;&apos;]?(\w+)[&quot;&apos;]?$</ind:pattern>
+    <ind:instance operation="greater than or equal" datatype="int">1</ind:instance>
+  </ind:textfilecontent54_object>
+
+  <ind:textfilecontent54_state id="state_os_id_is_{{{ ID }}}" version="1">
+    <ind:subexpression operation="pattern match">{{{ OS_ID }}}</ind:subexpression>
+  </ind:textfilecontent54_state>
+
+</def-group>

shared/templates/platform_os_linux/template.yml

@@ -0,0 +1,3 @@
+supported_languages:
+  - ansible
+  - oval