[PATCH] Adding new OVAL check that will parse /etc/passwd, looking for system accounts with real login shells (not /sbin/nologin).

Maura Dailey maura at eclipse.ncsc.mil
Mon Jul 22 16:00:13 UTC 2013


I can add more exceptions. I'm more concerned that the prose is so vague.

- Maura Dailey

On 07/19/2013 10:04 PM, Shawn Wells wrote:
> On 7/19/13 6:15 PM, Maura Dailey wrote:
>> Here's one more patch to clean up 'make validate' just a teensy bit more. This one required a lot of testing due to complicated regex.
>>
>> - Maura Dailey
>>
>> Signed-off-by: Maura Dailey<maura at eclipse.ncsc.mil>
>> ---
>>   .../accounts_no_shelllogin_for_systemaccounts.xml  |   23 ++++++++++++++++++++
>>   .../system/accounts/restrictions/root_logins.xml   |    2 +-
>>   2 files changed, 24 insertions(+), 1 deletions(-)
>>   create mode 100644 RHEL6/input/checks/accounts_no_shelllogin_for_systemaccounts.xml
>>
>> diff --git a/RHEL6/input/checks/accounts_no_shelllogin_for_systemaccounts.xml b/RHEL6/input/checks/accounts_no_shelllogin_for_systemaccounts.xml
>> new file mode 100644
>> index 0000000..a5b9334
>> --- /dev/null
>> +++ b/RHEL6/input/checks/accounts_no_shelllogin_for_systemaccounts.xml
>> @@ -0,0 +1,23 @@
>> +<def-group>
>> +  <definition class="compliance" id="accounts_no_shelllogin_for_systemaccounts" version="1">
>> +    <metadata>
>> +      <title>System Accounts Do Not Run a Shell</title>
>> +      <affected family="unix">
>> +        <platform>Red Hat Enterprise Linux 6</platform>
>> +      </affected>
>> +      <description>The root account is the only system account that should have a login shell.</description>
>> +    </metadata>
>> +    <criteria>
>> +      <criterion comment="tests for the presence of login shells (not /sbin/nologin) for system accounts in /etc/passwd file" test_ref="test_accounts_no_shelllogin_for_systemaccounts" />
>> +    </criteria>
>> +  </definition>
>> +  <ind:textfilecontent54_test check="all" check_existence="none_exist" comment="tests for the presence of login shells (not /sbin/nologin) for system accounts in /etc/passwd file" id="test_accounts_no_shelllogin_for_systemaccounts" version="1">
>> +    <ind:object object_ref="object_accounts_no_shelllogin_for_systemaccounts" />
>> +  </ind:textfilecontent54_test>
>> +  <ind:textfilecontent54_object id="object_accounts_no_shelllogin_for_systemaccounts" version="1">
>> +    <ind:path>/etc</ind:path>
>> +    <ind:filename>passwd</ind:filename>
>> +    <ind:pattern operation="pattern match">^(?!.*root).*:x:[\d]*:0*([0-9]{1,2}|[1-4][0-9]{2}):[^:]*:[^:]*:(?!\/sbin\/nologin).*$</ind:pattern>
>
> Seems to fail on the sync, shutdown, halt accounts
>
> sync:x:5:0:sync:/sbin:/bin/sync
> shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
> halt:x:7:0:halt:/sbin:/sbin/halt
>
>
>
>> +    <ind:instance datatype="int">1</ind:instance>
>> +  </ind:textfilecontent54_object>
>> +</def-group>
>> diff --git a/RHEL6/input/system/accounts/restrictions/root_logins.xml b/RHEL6/input/system/accounts/restrictions/root_logins.xml
>> index f9b6aa2..1f2a840 100644
>> --- a/RHEL6/input/system/accounts/restrictions/root_logins.xml
>> +++ b/RHEL6/input/system/accounts/restrictions/root_logins.xml
>> @@ -158,7 +158,7 @@ section on the root account. Doing so might cause the system to
>>   become inaccessible.
>>   </warning>
>>   <ident cce="26966-2" />
>> -<oval id="no_shelllogin_for_systemaccounts" />
>> +<oval id="accounts_no_shelllogin_for_systemaccounts" />
>>   <ref nist="" disa="178" />
>>   <tested by="DS" on="20121024"/>
>>   </Rule>
>> -- 1.7.1 _______________________________________________ 
>> scap-security-guide mailing list 
>> scap-security-guide at lists.fedorahosted.org 
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>
>
> -- 
> Shawn Wells
> Director, Innovation Programs
> shawn at redhat.com  | 443.534.0130
> @shawndwells
>
>
> _______________________________________________
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