com.sun.enterprise.security.auth.realm.pam.PamRealm Maven / Gradle / Ivy

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// Portions Copyright [2019] [Payara Foundation and/or its affiliates]
package com.sun.enterprise.security.auth.realm.pam;

import static java.util.logging.Level.SEVERE;

import java.util.Collections;
import java.util.Enumeration;
import java.util.Properties;
import java.util.Set;
import java.util.logging.Logger;

import org.jvnet.hk2.annotations.Service;
import org.jvnet.libpam.PAMException;
import com.sun.appserv.security.AppservRealm;
import com.sun.enterprise.security.auth.realm.BadRealmException;
import com.sun.enterprise.security.auth.realm.NoSuchRealmException;
import com.sun.enterprise.security.auth.realm.NoSuchUserException;
import static com.sun.enterprise.security.auth.realm.Realm.JAAS_CONTEXT_PARAM;
import org.jvnet.libpam.PAM;
import org.jvnet.libpam.UnixUser;

/**
 * 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";

    @Override
    protected 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");
        }

        setProperty(JAAS_CONTEXT_PARAM, jaasCtx);
    }

    /**
     * @return {@value #AUTH_TYPE}.
     */
    @Override
    public String getAuthType() {
        return AUTH_TYPE;
    }

    @Override
    public Enumeration getGroupNames(String username) throws NoSuchUserException {
        try {
            Set groupsSet = new UnixUser(username).getGroups();
            return Collections.enumeration(groupsSet);
        } catch (PAMException ex) {
            Logger.getLogger(PamRealm.class.getName()).log(SEVERE, "pam_exception_getgroupsofuser", ex);
            return null;
        }
    }

    public UnixUser authenticate(String username, char[] password) {
        try {
            return new PAM(PAM_SERVICE).authenticate(username, String.valueOf(password));
        } catch (PAMException ex) {
            Logger.getLogger(PamRealm.class.getName()).log(SEVERE, "pam_exception_authenticate", ex);
            return null;
        }
    }

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