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package com.sun.enterprise.security.auth.realm.pam;

import com.sun.appserv.security.AppservRealm;
import com.sun.enterprise.security.auth.realm.BadRealmException;
import com.sun.enterprise.security.auth.realm.NoSuchUserException;
import com.sun.enterprise.security.auth.realm.NoSuchRealmException;
import java.util.Collections;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.jvnet.hk2.annotations.Service;
import org.jvnet.libpam.PAM;
import org.jvnet.libpam.PAMException;

/**
 * Realm wrapper for supporting PAM based authentication for all Unix machines.
 * The PAM realm uses the Operating System's PAM login mechanism to authenticate
 * the applications with their OS usernames and passwords.
 * @author Nithya Subramanian
 */

@Service
public final class PamRealm extends AppservRealm {
    
    // Descriptive string of the authentication type of this realm.
    public static final String AUTH_TYPE = "pam";
    
    //Default PAM stack service set to sshd - since it is present in all
    //OSx by default
    private static final String PAM_SERVICE = "sshd";

    /**
     * Initialize a realm with some properties.  This can be used
     * when instantiating realms from their descriptions.  This
     * method may only be called a single time.  
     *
     * @param props Initialization parameters used by this realm.
     * @exception BadRealmException If the configuration parameters
     *     identify a corrupt realm.
     * @exception NoSuchRealmException If the configuration parameters
     *     specify a realm which doesn't exist.
     *
     */
    public synchronized void init(Properties props)
            throws BadRealmException, NoSuchRealmException {
        super.init(props);
        String jaasCtx = props.getProperty(JAAS_CONTEXT_PARAM);
        if (jaasCtx == null) {
            throw new BadRealmException("No jaas-context defined");
        }
        this.setProperty(JAAS_CONTEXT_PARAM, jaasCtx);
    }

    /**
     * @return Description of the kind of authentication that is directly
     *     supported by this realm.
     */
    public String getAuthType() {
        return AUTH_TYPE;
    }
    
    @Override
    public Enumeration getGroupNames(String username) throws NoSuchUserException {   
        try {
            Set groupsSet = new PAM(PAM_SERVICE).getGroupsOfUser(username);
            return Collections.enumeration(groupsSet);
        } catch (PAMException ex) {
            Logger.getLogger(PamRealm.class.getName()).log(Level.SEVERE,
                    "pam_exception_getgroupsofuser", ex);
            return null;
        }       
    }

    /**
     * This method retreives the PAM service stack to be used by the Realm class
     * and Login Module uniformly
     * @return String = Pam Service
     */
    public String getPamService() {
        return PAM_SERVICE;
    }
}