fix CCE-27032-2 no_files_unowned_by_user.xml

Shawn Wells shawn at redhat.com
Thu Jan 23 02:56:47 UTC 2014


On 12/18/13, 10:45 AM, Rodney L. Mercer wrote:
> Based on comments and recommendations from the following thread, I've
> submitted a patch to fix CCE-27032-2 no_files_unowned_by_user.xml
> https://lists.fedorahosted.org/pipermail/scap-security-guide/2013-July/003627.html
>
> This only checks /etc/passwd and not any other authorization databases.
>
>
> 8<====================
> >From ab80797697bdf00c5e05caf150124df67e0a9a51 Mon Sep 17 00:00:00 2001
> From: Rodney Mercer<rmercer at harris.com>
> Date: Wed, 18 Dec 2013 15:01:25 +0000
> Subject: [PATCH] Modified no_files_unowned_by_user.xml
>   modified completely broken no_files_unowned_by_user.xml to properly
> check all files on the system to make sure that they are owned by a user
> that resides in /etc/passwd.
>
> ---
>   RHEL6/input/checks/no_files_unowned_by_user.xml |   51
> ++++++++++++----------
>   1 files changed, 28 insertions(+), 23 deletions(-)
>
> diff --git a/RHEL6/input/checks/no_files_unowned_by_user.xml
> b/RHEL6/input/checks/no_files_unowned_by_user.xml
> index a73183a..f3f1276 100644
> --- a/RHEL6/input/checks/no_files_unowned_by_user.xml
> +++ b/RHEL6/input/checks/no_files_unowned_by_user.xml
> @@ -1,38 +1,43 @@
>   <def-group>
> -  <definition class="compliance"
> -  id="no_files_unowned_by_user" version="1">
> +  <definition class="compliance" id="no_files_unowned_by_user"
> version="1">
>       <metadata>
>         <title>Find files unowned by a user</title>
>         <affected family="unix">
>           <platform>Red Hat Enterprise Linux 6</platform>
>         </affected>
> -      <description>All files should be owned by a
> -      user</description>
> +      <description>All files should be owned by a user</description>
> +      <reference source="rmercer" ref_id="20131218"
> ref_url="test_attestation" />
>       </metadata>
>       <criteria>
> -      <criterion comment="Check all files and make sure they are owned
> by a user"
> -      negate="true"
> -      test_ref="test_20050" />
> +      <criterion comment="Check all files and make sure they are owned
> by a user" test_ref="no_files_unowned_by_user_test" />
>       </criteria>
>     </definition>
> -  <unix:file_test
> xmlns:unix="http://oval.mitre.org/XMLSchema/oval-definitions-5#unix"
> -  check="all" comment="files with no user owner"
> -  id="test_20050" version="1">
> -    <notes>
> -      <note>This will enumerate all files on local
> -      partitions</note>
> -    </notes>
> -    <unix:object object_ref="obj_20022" />
> -    <unix:state state_ref="state_20050" />
> -  </unix:file_test>
> -  <unix:file_state comment="Executables with suid set"
> -  id="state_20050" version="1">
> -    <unix:user_id datatype="int">0</unix:user_id>
> +
> +  <unix:file_state id="file_permissions_unowned_userid_list_match"
> version="1">
> +    <unix:user_id var_check="at least one"
> var_ref="file_permissions_unowned_userid_list" datatype="int" />
>     </unix:file_state>
> -  <unix:file_object comment="all local files"
> -  id="obj_20022" version="1">
> -    <unix:behaviors recurse="symlinks and directories"
> recurse_file_system="local" />
> +
> +  <local_variable id="file_permissions_unowned_userid_list"
> comment="List of valid user ids" datatype="int" version="1">
> +    <object_component item_field="subexpression"
> object_ref="file_permissions_unowned_userid_list_object" />
> +  </local_variable>
> +
> +  <ind:textfilecontent54_object
> id="file_permissions_unowned_userid_list_object" version="1">
> +    <ind:filepath>/etc/passwd</ind:filepath>
> +    <ind:pattern operation="pattern
> match">^[^:]+:[^:]+:([\d]+):[\d]+:[^:]*:[^:]+:[^:]*$</ind:pattern>
> +    <ind:instance operation="greater than or equal"
> datatype="int">1</ind:instance>
> +  </ind:textfilecontent54_object>
> +
> +  <unix:file_object comment="all local files"
> id="file_permissions_unowned_object" version="1">
> +    <unix:behaviors recurse="symlinks and directories"
> recurse_direction="down" recurse_file_system="local" />
>       <unix:path>/</unix:path>
>       <unix:filename operation="pattern match">.*</unix:filename>
> +    <filter
> action="exclude">file_permissions_unowned_userid_list_match</filter>
>     </unix:file_object>
> +
> +  <unix:file_test
> xmlns:unix="http://oval.mitre.org/XMLSchema/oval-definitions-5#unix"
> +  check="all" check_existence="none_exist" comment="Check user ids on
> all files on the system"
> +  id="no_files_unowned_by_user_test" version="1">
> +    <unix:object object_ref="file_permissions_unowned_object" />
> +  </unix:file_test>
>   </def-group>
> +
> -- 1.7.1
Works on my machine. Ack.


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