I'm afraid we hit the limitation of OVAL specification:

> The required object_ref attribute provides a reference to an existing
OVAL Object declaration. The referenced OVAL Object specifies a set of OVAL
Items to collect. Note that an OVAL Object might identify 0, 1, or many
OVAL Items on a system. If no items are found on the system then an error
should be reported when determining the value of an ObjectComponentType. If
1 or more OVAL Items are found then each OVAL Item will be considered and
the ObjectComponentType may have one or more values.

I think that the workaround could be that the regular expression always
matches at least an empty string. Then I think the variable will not be
empty but it would contain an item that contains an empty string, so the
concatenation could proceed. I haven't tried it if it works, though.


On Fri, May 31, 2019 at 3:26 PM Ilya Okomin <ilya.oko...@oracle.com> wrote:

> Hi Team,
> I need some piece of advice how to implement join in OVAL for variables if
> some of them are empty .
> I'm looking at the existing example from master which uses
> <concat>-<split>. However this code doesn't work as expected for empty
> variable var_rfg_include_config_regex in <concat> - returned result "no
> value", while expected would be "%^/etc/rsyslog.conf$":
> https://github.com/ComplianceAsCode/content/blob/master/linux_os/guide/system/logging/ensure_rsyslog_log_file_configuration/rsyslog_files_groupownership/oval/shared.xml#L43
> Note: UniqueFunctionType
> <https://oval.mitre.org/language/version5.11/ovaldefinition/documentation/oval-definitions-schema.html#UniqueFunctionType>
> looks more applicable here, but it doesn't work as well with the same
> reason - returned result is "no value" when one of variables is empty.
> Can any approach be suggested to avoid getting "no value" and return
> expected result for sample var_rfg_all_log_files_as_string_regex variable
> (with joined values from defined only variables/objects)?
> Regards,
> Ilya.
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Jan Černý
Security Technologies | Red Hat, Inc.
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