[jboss-jira] [JBoss JIRA] (ELY-1151) Empty authorization name for Digest mechanism causes authentication fail

[Ondrej Lukas (JIRA)]

Ondrej Lukas created ELY-1151:
---------------------------------

             Summary: Empty authorization name for Digest mechanism causes authentication fail
                 Key: ELY-1151
                 URL: https://issues.jboss.org/browse/ELY-1151
             Project: WildFly Elytron
          Issue Type: Bug
            Reporter: Ondrej Lukas
            Assignee: Darran Lofthouse
            Priority: Blocker


SASL specification says about Authorization Identity String [1]:
{quote}
If the authorization identity string is absent, the client is requesting to act as the identity the server associates with the client's credentials. *An empty string is equivalent to an absent authorization identity.*
{quote}

In case when authentication configuration includes empty name for authorization name then authentication fail. In correct behavior authentication name should be used if authorization name is empty string. 

It is caused by passing empty {{defaultName}} to {{NameCallback}} constructor which results to {{IllegalArgumentException}}. Condition in [2] checks only non-null value of {{authorizationId}} but it seems it should also check empty name.

It can be reproduced with correctly set wildfly-config.xml (i.e. configuration where authentication succeed) - in case {{set-authorization-name}} element with empty string is added to this configuration file then authentication starts to fail.

The same issue can occurs for every supported SASL mechanism. In needs to be revisited.

We request blocker flag since current behavior violates SASL specification.

[1] https://tools.ietf.org/html/rfc4422#section-3.4.1
[2] https://github.com/wildfly-security/wildfly-elytron/blob/596f25e853c8fbae088ff562708def3a43480aeb/src/main/java/org/wildfly/security/sasl/digest/DigestSaslClient.java#L223



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