[keycloak-dev] Pairwise clients and authorization services

[Martin Hardselius]

It's possible to get the user from the session given a token. That way we
can still resolve the local sub. But for a client configured with a SHA-256
based mapper it might be important to check if the resolved sub hashes to
the same sub in the token, whereas an encryption based sub should decrypt
to match a local sub.

Given the client for which the token was issued, it should be easy to find
out which algorithm was used (check mapper configuration).

I'm prepared to help out with a PR if you need assistance.

Martin

On Mon, 19 Feb 2018 at 19:20 Pedro Igor Silva <psilva at redhat.com> wrote:

> Thanks for the info. It seems the spec was changed to include other
> algorithms and examples.
>
> I think we can add support for encryption as an additional pairwise
> configuration. That would help us with the original issue and may be useful
> for those with a similar requirement.
>
> I've created https://issues.jboss.org/browse/KEYCLOAK-6659.
>
> Thanks.
>
> On Mon, Feb 19, 2018 at 2:32 PM, Martin Hardselius <
> martin.hardselius at gmail.com> wrote:
>
>> Yes, the default implementation is using SHA-256. That makes things a bit
>> more complicated. In retrospect, it might have been wiser to go with
>> AES-128 or some other kind of encryption.
>>
>> No specific reason. It was one of the suggestions in from the spec and I
>> suppose we failed to think of scenarios where we would wan't to resolve the
>> local sub.
>>
>> Martin
>>
>> On Mon, 19 Feb 2018 at 17:19 Pedro Igor Silva <psilva at redhat.com> wrote:
>>
>>> We did not consider subject type pairwise in authorization services, we
>>> need to review this ...
>>>
>>> If we can resolve local sub from the a pairwise subject type, I think
>>> this is the best way to go. But pairwise is using SHA26, right ?
>>>
>>> I also noticed you are the main contributor of subject pairwise, any
>>> specific reason why we are not using encryption ?
>>>
>>> Regards.
>>> Pedro Igor
>>>
>>> On Mon, Feb 19, 2018 at 11:40 AM, Martin Hardselius <
>>> martin.hardselius at gmail.com> wrote:
>>>
>>>> Hi,
>>>>
>>>> It seems like authorization services break when using them with a
>>>> pairwise
>>>> enabled client. I've not investigated the full extent of this but long
>>>> story short, the sub from the token is used in token validation and in
>>>> org.keyclak.authorization.common.KeycloakIdentity for some comparisons.
>>>>
>>>> Steps to reproduce:
>>>> 1. Create pairwise a client with authorization enabled
>>>> 3. Get access token (client_credentials)
>>>> 3, Try post a new resource_set
>>>>
>>>> I'm not sure what the best way to fix this is.
>>>> 1. Re-write token validation and KeycloakIdentity to not rely on the
>>>> sub in
>>>> the token,
>>>> 2. Re-write the pairwise protocol mapper to ignore service accounts
>>>> (feels
>>>> like putting make-up on a pig), or
>>>> 3. "terminate" pairwise subs, replacing them with the internal sub,
>>>> before
>>>> further processing.
>>>>
>>>> Thoughts?
>>>>
>>>> Regards,
>>>> Martin
>>>>
>>> _______________________________________________
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>>>>
>>>
>>>
>