[keycloak-dev] Certificate subject DN is provider dependent

[Lösch, Sebastian]

Hello Keycloak developers,

I am currently working on configuring keycloak for X.509 certificate login.
We store the whole user certificate's subject DN as user attribute. During the login we match the authentication certificate's subjectDN against the value stored in the user attributes.
The subject DN is determined executing:
cert.getSubjectDN().getName()

Here we have a problem regarding the subject DN order. We realized that the subject DN order is security provider specific:

·         Using SUN security provider we get a subject DN like:
"EMAILADDRESS=bjensen at example.com, CN=Ms. Barbara J Jensen III, O=example.com, ST=California, C=US"

·         Using BouncyCastle security provider we get a subject DN like:
"C=US,ST=California,O=example.com,CN=Ms. Barbara J Jensen III,E=bjensen at example.com"
This is obviously a problem.
Does anybody else ran into the same problem?

In my opinion it would be better to use:

cert.getSubjectX500Principal().getName(X500Principal.CANONICAL)
to determine the subject DN, as the result is provider independent.
But this would be an backward incompatible change in Method
org.keycloak.authentication.authenticators.x509.AbstractX509ClientCertificateAuthenticator.UserIdentityExtractorBuilder.fromConfig()

What is your opinion?

Best regards
Sebastian

--
Solution Engineering
--
Governikus GmbH & Co. KG
Hochschulring 4
28359 Bremen, Germany

Phone: +49 421 204 95 - 28
Fax: +49 421 204 95 - 11
E-Mail: Sebastian.Loesch at governikus.de<mailto:Sebastian.Loesch at governikus.de>
www.governikus.de<http://www.governikus.de/>
--
Governikus GmbH & Co. KG
Aufsichtsratsvorsitzender: Dr. Martin Hagen | Amtsgericht Bremen HRA
22041
Geschäftsführer: Dr. Stephan Klein

Persönlich haftende Gesellschafterin: Governikus Bremen GmbH
Geschäftsführer: Dr. Stephan Klein | Amtsgericht Bremen HRB 18756


****************************************************
Wir sind umgezogen! Bitte beachten Sie unsere neue Anschrift: Hochschulring 4, 28359 Bremen

Veranstaltungsvorschau: Besuchen Sie uns...
Dataport Hausmesse | 02.04.2019 | Hamburg - Schnelsen<https://www.dataport.de/Seiten/Aktuelles/Veranstaltungen/190402-Hausmesse-Dataport.aspx>
Digitaler Staat | 02. + 03.04.2019 | Berlin<https://www.digitaler-staat.org/>
7. Zukunftskongress Staat & Verwaltung | 27. - 29.05.2019 | Berlin<https://www.zukunftskongress.info/de>
Kongress Baden-Württemberg | 04.07.2019 | Stuttgart<https://www.bw-4-0.de/>

[cid:image8a82cf.JPG at 26f9b88d.448c29be]<http://www.jahrestagung.governikus.de/>