I’d recommend using a federation provider. Others may have another opinion but here’s the approach I like, using a federation provider:

Create the user when Keycloak calls one of these methods on the federation provider and the user exists in the legacy system:

UserFederationProvider.getUserByUsername()

UserFederationProvider.getUserByEmail()

This creates the federation link. However, do not set a password for the user yet (you wouldn’t know what to set it to yet anyway). Then, when Keycloak calls:

UserFederationProvider.validCredentials(RealmModel realm, UserModel user, List<UserCredentialModel> input)

query your legacy system to see if the given user and password combination is valid. If so:

1. Update the user (in Keycloak) to have password supplied in List<UserCredentialModel> input

2. Break the federation link (session.userStorage().getUserById(user.getId(), realm).setFederationLink(null);)

I’m going to publish a template for migrating users using this approach soon. For now, I hope this is enough to get you going in the right direction if you choose the federation provider approach.

Scott Rossillo

Smartling | Senior Software Engineer

srossillo@smartling.com

On Oct 5, 2015, at 11:59 AM, Remi Cartier <remi.cartier@imetrik.com> wrote:

Hey guys,

I will have to migrate from a custom in house user management system to keycloak.

We are using this algorithm to store salted/hashed password :

public static String hashPassword(String password, String salt) {

try {

KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt.getBytes(), 2048, 160);

SecretKeyFactory secretKeyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");

byte[] hash = secretKeyFactory.generateSecret(keySpec).getEncoded();

return new BigInteger(1, hash).toString(16);

} catch (Exception x) {

throw new IllegalStateException(x);

}

}

I was wondering, in order to ease the migration, if I could configure keycloak to use the same hash algorithm ?

Or if there was any other ways ? Like maybe a federation provider, but then comes the question when to push things into keycloak, at password change ?

What do you think ?

Sincerely.

REMI CARTIER

B.O.S.S. (Business & Operation Support Systems) P.O (Product Owner)

IMETRIK GLOBAL INC.
T : +1 514 448-6407 x2009
T : +1 866 276-5382 (toll free)
F : +1 514 904-0611

740 Notre Dame St. West, Suite 1575
Montreal, Quebec, Canada H3C 3X6
imetrik.com

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