Modifier spans like (?i) and (?-i) aren't supported in OVAL, though they will probably work in some interpreters depending on the regex implementation.
 
 
Shane Shaffer
G2, Inc.
shane.shaffer@g2-inc.com  


On Tue, Sep 3, 2013 at 11:49 AM, Maura Dailey <maura@eclipse.ncsc.mil> wrote:
240  /etc/ssh/sshd_config Banner
The OVAL check was definitely working on my system when I last tested it. I'm able to reproduce...

[root@rhel6 checks]# cat /etc/issue
You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only. By using this IS (which includes any device attached to this IS), you consent to the following conditions:
-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.
-At any time, the USG may inspect and seize data stored on this IS.
-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.
-This IS includes security measures (e.g., authentication and access controls) to protect USG interests -- not for your personal benefit or privacy.
-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.

[root@rhel6 checks]# ./testcheck.py sshd_banner_set.xml
Evaluating with OVAL tempfile : /tmp/sshd_banner_setXKCJxI.xml
Writing results to : /tmp/sshd_banner_setXKCJxI.xml-results
Definition oval:scap-security-guide.testing:def:193: false
Definition oval:scap-security-guide.testing:def:191: false
Definition oval:scap-security-guide.testing:def:190: false
Evaluation done.

Maura, do you want to take a stab at this (noticed your signoff on the OVAL)?

FWIW, if I used the USGCB banner everything worked OK.


The ONLY thing the check is doing is checking that the line 'Banner /etc/issue' exists in /etc/ssh/sshd_config or that sshd is disabled. It doesn't care about the content of /etc/issue at all. I have no idea why it's failing for both of you guys. Full check is below my signature for comparison.

- Maura Dailey

<def-group>
  <definition class="compliance" id="sshd_banner_set" version="1">
    <metadata>
      <title>Enable a Warning Banner</title>
      <affected family="unix">
        <platform>Red Hat Enterprise Linux 6</platform>
      </affected>
      <description>SSH warning banner should be enabled (and dependencies are
      met)</description>
      <reference source="MED" ref_id="20130813" ref_url="test_attestation" />
    </metadata>
    <criteria comment="SSH is not being used or conditions are met"
    operator="OR">
      <extend_definition comment="sshd service is disabled"
      definition_ref="service_sshd_disabled" />
      <criterion comment="Check Banner in /etc/ssh/sshd_config"
      test_ref="test_sshd_banner_set" />
    </criteria>
  </definition>
  <ind:textfilecontent54_test check="all" check_existence="all_exist"
  comment="Tests the value of the Banner[\s]+/etc/issue setting in the /etc/ssh/sshd_config file"
  id="test_sshd_banner_set" version="1">
    <ind:object object_ref="obj_sshd_banner_set" />
  </ind:textfilecontent54_test>
  <ind:textfilecontent54_object id="obj_sshd_banner_set" version="1">
    <ind:path>/etc/ssh</ind:path>
    <ind:filename>sshd_config</ind:filename>
    <ind:pattern operation="pattern match">^[\s]*(?i)Banner(?-i)[\s]+/etc/issue[\s]*$</ind:pattern>

    <ind:instance datatype="int">1</ind:instance>
  </ind:textfilecontent54_object>
</def-group>

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