Suggestion on the 'Ensure All Files Are Owned...' items
Maura Dailey
maura at eclipse.ncsc.mil
Tue Jul 23 19:47:48 UTC 2013
Just an aside, I did some poking around, and it is possible to eliminate
directories from the search. I looked at the USGCB stuffs and here's
what I put together for file_permissions_unowned.xml in OVAL to
eliminate /proc. I can do the same for the group id version. To add more
exclusions, add an '|' after proc, and type in another directory path.
It doesn't seem to care if you escape the forward slashes, but I left
that in just in case the behavior changes later.
If anyone does figure out how to query PAM or nslcd/nscd for network
user ids, I think you can add it as an extra filter option to the
file_permissions_unowned_object.
Please note, I have not gotten a single failure with this check against
/proc. I get thousands of failures on my workstation, since I have large
git repositories checked out to directories owned by my network account
on the root hard drive.
|<def-group>||
|| <definition class="compliance" id="file_permissions_unowned"
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>||
|| </metadata>||
|| <criteria>||
|| <criterion comment="Check all files and make sure they are owned
by a user" test_ref="file_permissions_unowned_test" />||
|| </criteria>||
|| </definition>||
||
|| <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>||
||
|| <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:filepath operation="pattern
match">^(?!\/proc)/</unix:filepath>||
|| <filter
action="exclude">file_permissions_unowned_userid_list_match</filter>||
|| </unix:file_object>||
||
|| <unix:file_test check="all" check_existence="none_exist"
comment="Check user ids on all files on the system"
id="file_permissions_unowned_test" version="1">||
|| <unix:object object_ref="file_permissions_unowned_object" />||
|| </unix:file_test>||
||</def-group>|
- Maura Dailey
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