[PATCH 1/3] [bugfix] - disable_host_auth OVAL false positive

Shawn Wells shawn at redhat.com
Fri Aug 1 20:10:26 UTC 2014


On 7/29/14, 8:43 PM, Gabe wrote:
> - fix false positive for SSH host-based authentication check in sshd_config
>
> Signed-off-by: Gabe <redhatrises at gmail.com>
> ---
>   shared/oval/disable_host_auth.xml | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/shared/oval/disable_host_auth.xml b/shared/oval/disable_host_auth.xml
> index 6f4eb9d..de51fd7 100644
> --- a/shared/oval/disable_host_auth.xml
> +++ b/shared/oval/disable_host_auth.xml
> @@ -14,7 +14,7 @@
>         <extend_definition comment="sshd service is disabled"
>         definition_ref="service_sshd_disabled" />
>         <criterion comment="Check HostbasedAuthentication in /etc/ssh/sshd_config"
> -      test_ref="test_sshd_hostbasedauthentication" />
> +      negate="true" test_ref="test_sshd_hostbasedauthentication" />
>       </criteria>
>     </definition>
>     <ind:textfilecontent54_test check="all" check_existence="none_exist"
> @@ -24,7 +24,7 @@
>     </ind:textfilecontent54_test>
>     <ind:textfilecontent54_object id="object_sshd_hostbasedauthentication" version="2">
>       <ind:filepath>/etc/ssh/sshd_config</ind:filepath>
> -    <ind:pattern operation="pattern match">^[\s]*(?i)HostbasedAuthentication(?-i)[\s]+yes[\s]*(?:|(?:#.*))?$</ind:pattern>
> +    <ind:pattern operation="pattern match">^[\s]*(?i)HostbasedAuthentication(?-i)[\s]+no[\s]*(?:|(?:#.*))?$</ind:pattern>
>       <ind:instance datatype="int">1</ind:instance>
>     </ind:textfilecontent54_object>
>   </def-group>

The negate properly will fail you if HostbasedAuthentication != no, but 
I'm not getting the false positive. Can you share how to reproduce?

this passes as expected:
$ sudo grep ^HostbasedAuthentication /etc/ssh/sshd_config
HostbasedAuthentication no
$ sudo ./testcheck.py disable_host_auth.xml
Evaluating with OVAL tempfile : /tmp/disable_host_authaoRDFL.xml
Writing results to : /tmp/disable_host_authaoRDFL.xml-results
Definition oval:scap-security-guide.testing:def:103: false
Definition oval:scap-security-guide.testing:def:101: false
Definition oval:scap-security-guide.testing:def:100: true
Evaluation done.

fails as expected:
$ sudo sed -i 's/HostbasedAuthentication no/HostbasedAuthentication 
yes/g' /etc/ssh/sshd_config
$ sudo grep ^HostbasedAuthentication /etc/ssh/sshd_config
HostbasedAuthentication yes
$ sudo ./testcheck.py disable_host_auth.xml
Evaluating with OVAL tempfile : /tmp/disable_host_auth2Vo5qy.xml
Writing results to : /tmp/disable_host_auth2Vo5qy.xml-results
Definition oval:scap-security-guide.testing:def:103: false
Definition oval:scap-security-guide.testing:def:101: false
Definition oval:scap-security-guide.testing:def:100: false
Evaluation done.





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