[keycloak-dev] Certificate subject DN is provider dependent

[Thomas Darimont]

Hi Sebastian,

how about Keycloak would introduce an option for this authenticator like:
"Use canonical principal extraction" on/off with default "off",
meaning the default behavior stays the same. "on" would then mean to use
the "canonical" option for extracting the subject as you suggested.

Cheers,
Thomas

Am Di., 12. Feb. 2019 um 12:33 Uhr schrieb Lösch, Sebastian <
Sebastian.Loesch at governikus.de>:

> 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
>
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