[keycloak-dev] Can't login with email as username if another user has same email

[Schuster Sebastian (INST/ESY1)]

I could also imagine enforcing in the server that whenever a user has an email as the username, it is always identical to the email address.
However, that change might be problematic considering all the existing data...

Best regards,
Sebastian

Mit freundlichen Grüßen / Best regards

Dr.-Ing.  Sebastian Schuster

Engineering and Support (INST/ESY1) 
Bosch Software Innovations GmbH | Ullsteinstr. 128 | 12109 Berlin | GERMANY | www.bosch-si.com
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-----Original Message-----
From: keycloak-dev-bounces at lists.jboss.org [mailto:keycloak-dev-bounces at lists.jboss.org] On Behalf Of Stian Thorgersen
Sent: Freitag, 10. November 2017 07:14
To: keycloak-dev <keycloak-dev at lists.jboss.org>
Subject: [keycloak-dev] Can't login with email as username if another user has same email

If user#1 has the username 'user at host.com' with no email, and user#2 has the email 'user at host.com', user#1 would not be able to login.

In this case user#1 would have to contact the admin who would have to change the username or add an email.

This issue was reported a while back by our QE [1], but AFAIK no actual users have run into this problem and it seems unlikely that it'll be a real problem.

I'm leaning towards just closing this issue as won't fix.

Best ideas I have for solving is:

1. Make sure username can't match email of another user. Not sure how we could do this as I'm pretty sure that couldn't be done with SQL.

2. Add a code check for for the above. It won't be guaranteed, but maybe good enough?

3. Add option to set if realm should allow login by "Username and email", "Username only" or "Email only". For the "Username and email" option we should document the fact that this issue can happen and that email always wins.

[1] https://issues.jboss.org/browse/KEYCLOAK-4466
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