[Opendnssec-user] Question about P11Attributes checks

Dave Fine finerrecliner at gmail.com
Mon Oct 23 15:13:12 UTC 2017

Thank you for the information. I still don't see where in the code that any
of these `ck` checks are enforced though. For example, who enforces `ck7`
on a P11ECPrivateKeyObj, so that a sensitive key cannot be revealed?

Thank you,

On Thu, Oct 12, 2017 at 11:09 AM Rickard Bellgrim <rickard at opendnssec.org>

> Hi Dave
> The checks comes from PKCS#11 [1] and is enforced according to it. You can
> cross-reference all the attributes with PKCS#11.
> ck1 is set for CKA_CLASS [2], but CKA_TOKEN is an optional attribute that
> will default to CK_FALSE and is not required when creating an object.
> CKA_CERTIFICATE_TYPE is only used by certificate object and will not be
> required for key objects. You can check how the attributes are used in
> P11Objects.cpp [3] and also in the PKCS#11 standard.
> [1]
> http://docs.oasis-open.org/pkcs11/pkcs11-base/v2.40/os/pkcs11-base-v2.40-os.html
> [2]
> https://github.com/opendnssec/SoftHSMv2/blob/develop/src/lib/P11Attributes.h#L140
> [3]
> https://github.com/opendnssec/SoftHSMv2/blob/develop/src/lib/P11Objects.cpp
> // Rickard
> On Wed, Oct 11, 2017 at 11:34 PM, Dave Fine <finerrecliner at gmail.com>
> wrote:
>> Hello,
>> I have a question regarding P11Attributes.h the SoftHSMv2 code base. In
>> this file, there is an enum that defines a number of `ck` checks. As an
>> example, ck1 seems to be reserved for when an attribute is required while
>> creating an object. Therefore, I would expect ck1 to be set on P11Attribute
>> child classes such as P11AttrClass, and P11AttrToken (to enforce
>> requiring CKA_CLASS and CKA_TOKEN). However, I see that ck1 is not used for
>> P11AttrToken. Instead I see P11AttrCertificateType uses a ck1 check,
>> which is not something I would think be required when creating an object.
>> For example, why would CKA_CERTIFICATE_TYPE be required, if you were
>> creating a key object?
>> Could someone clear up how the `ck` checks are supposed to be used?
>> Perhaps I am not understanding it correctly.
>> Thank you,
>> -Dave
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