Hi,

In replicated LDAP setups, it's a common situation where the slave is read-only, and if a write operation is attempted, it returns a so-called referral (see more here). Simply put, a referral is an instruction to proceed with the same LDAP operation but using different URL, contained within response. In a replicated setup, this URL would point to master instance, which is read-write.

Currently, KeyCloak cannot use such a slave replica as a federation provider in a WRITABLE edit mode. LDAP entries are imported successfully; but further attempts to modify them in KeyCloak admin console give success message, while the actual values are not modified. If Sync Registrations is on, attempt to create a user results in the following exception:

javax.naming.PartialResultException: [LDAP: error code 10 - Referral]; remaining name 'uid=foo,ou=People,dc=foobar,dc=com'

	at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2971)

	at com.sun.jndi.ldap.LdapCtx.processReturnCode(LdapCtx.java:2888)

	at com.sun.jndi.ldap.LdapCtx.c_createSubcontext(LdapCtx.java:812)

	at com.sun.jndi.toolkit.ctx.ComponentDirContext.p_createSubcontext(ComponentDirContext.java:341)

	at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.createSubcontext(PartialCompositeDirContext.java:268)

	at com.sun.jndi.toolkit.ctx.PartialCompositeDirContext.createSubcontext(PartialCompositeDirContext.java:256)

	at javax.naming.directory.InitialDirContext.createSubcontext(InitialDirContext.java:197)

	at javax.naming.directory.InitialDirContext.createSubcontext(InitialDirContext.java:197)

	at org.keycloak.federation.ldap.idm.store.ldap.LDAPOperationManager$7.execute(LDAPOperationManager.java:434)

	at org.keycloak.federation.ldap.idm.store.ldap.LDAPOperationManager$7.execute(LDAPOperationManager.java:431)

	at org.keycloak.federation.ldap.idm.store.ldap.LDAPOperationManager.execute(LDAPOperationManager.java:536)

	at org.keycloak.federation.ldap.idm.store.ldap.LDAPOperationManager.createSubContext(LDAPOperationManager.java:431)

LDAP referrals are fully supported by JNDI and LDAP stack; the only thing we need is to set a Context.REFERRAL ("java.naming.referral") environment property to "follow" before creating an InitialLdapContext. I've noticed that in org.keycloak.federation.ldap.LDAPConfig, there is an initial support for additional connection properties (currently hardcoded to return null). Are there any plans to implement this?

Cheers,

Mitya

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