[jboss-jira] [JBoss JIRA] Created: (JBAS-8352) Stacked login with subclassed Principal does not work.

[Craig Horrell (JIRA)]

Stacked login with subclassed Principal does not work.
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                 Key: JBAS-8352
                 URL: https://jira.jboss.org/browse/JBAS-8352
             Project: JBoss Application Server
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Security
    Affects Versions: JBossAS-5.1.0.GA
         Environment: Windows XP; Jboss 5.1.0.GA;
            Reporter: Craig Horrell
            Assignee: Anil Saldhana


The Principal is not propagated from login module to login module when using stacked logins. Instead, a new Principal is created, but only the first one survives.

Code references:
1. org.jboss.security.auth.spi.UsernamePasswordLoginModule: Method login():
      Object username = sharedState.get("javax.security.auth.login.name");
      if (username instanceof Principal) {
        identity = (Principal) username;
      } else {
        String name = username.toString();
        try {
          identity = createIdentity(name);
        } catch (Exception e) {
          log.debug("Failed to create principal", e);
          throw new LoginException("Failed to create principal: " + e.getMessage());
        }
      }
The code above checks to see if the Object stored in the shared state is a Principal. This code is correct.

2. Later in the same method:
    if (getUseFirstPass() == true) {    // Add the username and password to the shared state map
      sharedState.put("javax.security.auth.login.name", username);
      sharedState.put("javax.security.auth.login.password", credential);
    }
This is part of the bug. It stores the name instead of the Object, which causes the second login module to create a new Principal.

3. org.jboss.security.auth.spi.AbstractServerLoginModule: Method: commit():
    Principal identity = getIdentity();
    principals.add(identity);
'principals' is a Set. The add will not replace an existing identity, so the one created by the second login module is ignored.

If the second login module got the object from the first, it could update it. As it is the second login module cannot do anything with the principal, as it is discarded.

Complications: Some thought would have to be given as to what would happen if two different principal classes were specified in the config. Perhaps disallow that ?  

Our specific issue: We have a subclassed SimplePrincipal that holds context based security information for that user that is checked as part of the authorization in our web services. We stack a LDAP login module for the user-id and password, then a subclass of DatabaseServerLoginModule that gets the roles and other context based data from a database.

Work Around: in the subclassed  DatabaseServerLoginModule's getRoleSets() method we do: 
    // To overcome stacked login bugs, we must replace the existing principal
    // with a new one created here.
    Principal pr = this.getIdentity();
    log.trace("SlDbServerLoginModule: getRoleSets(): "
          + "Got Principal from parent: user: " + pr.getName());
    SlIdentity slId = new SlIdentity(pr.getName());
    slId.addClientList(getSlClientList(username, roleSet));
    slId.addSiteList(getSlSiteList(username, roleSet));
    Set<Principal> prs = this.subject.getPrincipals();
    prs.remove(pr);
    prs.add(slId);
    log.trace("SlDbServerLoginModule: getRoleSets(): "
          + "Replaced Principal with SlIdentity: user: " + slId.getName());
    return roleSets;

Thanks,
Craig.





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