LdapUserDAO.java

/*
 ************************************************************************
 *******************  CANADIAN ASTRONOMY DATA CENTRE  *******************
 **************  CENTRE CANADIEN DE DONNÉES ASTRONOMIQUES  **************
 *
 *  (c) 2014.                            (c) 2014.
 *  Government of Canada                 Gouvernement du Canada
 *  National Research Council            Conseil national de recherches
 *  Ottawa, Canada, K1A 0R6              Ottawa, Canada, K1A 0R6
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package ca.nrc.cadc.ac.server.ldap;

import javax.security.auth.x500.X500Principal;
import java.security.AccessControlException;
import java.security.Principal;
import java.util.Collection;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;

import com.unboundid.ldap.sdk.*;
import com.unboundid.ldap.sdk.controls.ProxiedAuthorizationV2RequestControl;
import org.apache.log4j.Logger;

import ca.nrc.cadc.ac.PersonalDetails;
import ca.nrc.cadc.ac.User;
import ca.nrc.cadc.ac.UserNotFoundException;
import ca.nrc.cadc.auth.AuthenticationUtil;
import ca.nrc.cadc.auth.HttpPrincipal;
import ca.nrc.cadc.net.TransientException;


public class LdapUserDAO<T extends Principal> extends LdapDAO
{
    private static final Logger logger = Logger.getLogger(LdapUserDAO.class);

    // Map of identity type to LDAP attribute
    private Map<Class<?>, String> userLdapAttrib =
            new HashMap<Class<?>, String>();

    // User attributes returned to the GMS
    private static final String LDAP_FNAME = "givenname";
    private static final String LDAP_LNAME = "sn";
    //TODO to add the rest
    private String[] userAttribs = new String[]{LDAP_FNAME, LDAP_LNAME};
    private String[] memberAttribs = new String[]{LDAP_FNAME, LDAP_LNAME};

    public LdapUserDAO(LdapConfig config)
    {
        super(config);
        this.userLdapAttrib.put(HttpPrincipal.class, "uid");
        this.userLdapAttrib.put(X500Principal.class, "distinguishedname");

        // add the id attributes to user and member attributes
        String[] princs = userLdapAttrib.values()
                .toArray(new String[userLdapAttrib.values().size()]);
        String[] tmp = new String[userAttribs.length + princs.length];
        System.arraycopy(princs, 0, tmp, 0, princs.length);
        System.arraycopy(userAttribs, 0, tmp, princs.length,
                         userAttribs.length);
        userAttribs = tmp;

        tmp = new String[memberAttribs.length + princs.length];
        System.arraycopy(princs, 0, tmp, 0, princs.length);
        System.arraycopy(memberAttribs, 0, tmp, princs.length,
                         memberAttribs.length);
        memberAttribs = tmp;
    }


    /**
     * Get the user specified by userID.
     *
     * @param userID The userID.
     * @return User instance.
     * @throws UserNotFoundException  when the user is not found.
     * @throws TransientException     If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public User<T> getUser(T userID)
            throws UserNotFoundException, TransientException,
                   AccessControlException
    {
        String searchField = userLdapAttrib.get(userID.getClass());
        if (searchField == null)
        {
            throw new IllegalArgumentException(
                    "Unsupported principal type " + userID.getClass());
        }

        searchField =
                "(&(objectclass=cadcaccount)(" + searchField + "=" + userID
                        .getName() + "))";

        SearchResultEntry searchResult = null;
        try
        {
            SearchRequest searchRequest = new SearchRequest(config.getUsersDN(),
                                                            SearchScope.SUB,
                                                            searchField,
                                                            userAttribs);

            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" +
                                                             getSubjectDN()
                                                                     .toNormalizedString()));

            searchResult = getConnection().searchForEntry(searchRequest);
        }
        catch (LDAPException e)
        {
            LdapDAO.checkLdapResult(e.getResultCode());
        }

        if (searchResult == null)
        {
            String msg = "User not found " + userID.toString();
            logger.debug(msg);
            throw new UserNotFoundException(msg);
        }
        User<T> user = new User<T>(userID);
        user.getIdentities().add(
                new HttpPrincipal(searchResult.getAttributeValue(userLdapAttrib
                                                                         .get(HttpPrincipal.class))));

        String fname = searchResult.getAttributeValue(LDAP_FNAME);
        String lname = searchResult.getAttributeValue(LDAP_LNAME);
        user.details.add(new PersonalDetails(fname, lname));
        //TODO populate user with the other returned personal or posix attributes
        return user;
    }

    /**
     * Get all groups the user specified by userID belongs to.
     *
     * @param userID  The userID.
     * @param isAdmin
     * @return Collection of Group instances.
     * @throws UserNotFoundException  when the user is not found.
     * @throws TransientException     If an temporary, unexpected problem occurred., e.getMessage(
     * @throws AccessControlException If the operation is not permitted.
     */
    public Collection<DN> getUserGroups(final T userID, final boolean isAdmin)
            throws UserNotFoundException, TransientException,
                   AccessControlException
    {
        Collection<DN> groupDNs = new HashSet<DN>();
        try
        {
            String searchField = userLdapAttrib.get(userID.getClass());
            if (searchField == null)
            {
                throw new IllegalArgumentException(
                        "Unsupported principal type " + userID.getClass());
            }

            User<T> user = getUser(userID);
            Filter filter = Filter.createANDFilter(
                    Filter.createEqualityFilter(searchField,
                                                user.getUserID().getName()),
                    Filter.createPresenceFilter("memberOf"));

            SearchRequest searchRequest =
                    new SearchRequest(config.getUsersDN(), SearchScope.SUB,
                                      filter, "memberOf");

            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" +
                                                             getSubjectDN()
                                                                     .toNormalizedString()));

            SearchResultEntry searchResult =
                    getConnection().searchForEntry(searchRequest);

            DN parentDN;
            if (isAdmin)
            {
                parentDN = new DN(config.getAdminGroupsDN());
            }
            else
            {
                parentDN = new DN(config.getGroupsDN());
            }

            if (searchResult != null)
            {
                String[] members = searchResult.getAttributeValues("memberOf");
                if (members != null)
                {
                    for (String member : members)
                    {
                        DN groupDN = new DN(member);
                        if (groupDN.isDescendantOf(parentDN, false))
                        {
                            groupDNs.add(groupDN);
                        }
                    }
                }
            }
        }
        catch (LDAPException e)
        {
            LdapDAO.checkLdapResult(e.getResultCode());
        }
        return groupDNs;
    }

    /**
     * Check whether the user is a member of the group.
     *
     * @param userID  The userID.
     * @param groupID The groupID.
     * @return true or false
     * @throws UserNotFoundException  If the user is not found.
     * @throws TransientException     If an temporary, unexpected problem occurred.
     * @throws AccessControlException If the operation is not permitted.
     */
    public boolean isMember(T userID, String groupID)
            throws UserNotFoundException, TransientException,
                   AccessControlException
    {
        try
        {
            String searchField = userLdapAttrib.get(userID.getClass());
            if (searchField == null)
            {
                throw new IllegalArgumentException(
                        "Unsupported principal type " + userID.getClass());
            }

            User<T> user = getUser(userID);
            Filter filter = Filter.createANDFilter(
                    Filter.createEqualityFilter(searchField,
                                                user.getUserID().getName()),
                    Filter.createEqualityFilter("memberOf", groupID));

            SearchRequest searchRequest =
                    new SearchRequest(config.getUsersDN(), SearchScope.SUB,
                                      filter, "cn");

            searchRequest.addControl(
                    new ProxiedAuthorizationV2RequestControl("dn:" +
                                                             getSubjectDN()
                                                                     .toNormalizedString()));

            SearchResultEntry searchResults =
                    getConnection().searchForEntry(searchRequest);

            return (searchResults != null);
        }
        catch (LDAPException e)
        {
            LdapDAO.checkLdapResult(e.getResultCode());
        }
        return false;
    }

//    public boolean isMember(T userID, String groupID)
//        throws UserNotFoundException, TransientException,
//               AccessControlException
//    {
//        try
//        {
//            String searchField = (String) userLdapAttrib.get(userID.getClass());
//            if (searchField == null)
//            {
//                throw new IllegalArgumentException(
//                        "Unsupported principal type " + userID.getClass());
//            }
//
//            User<T> user = getUser(userID);
//            DN userDN = getUserDN(user);
//
//            CompareRequest compareRequest = 
//                    new CompareRequest(userDN.toNormalizedString(), 
//                                      "memberOf", groupID);
//            
//            compareRequest.addControl(
//                    new ProxiedAuthorizationV2RequestControl("dn:" + 
//                            getSubjectDN().toNormalizedString()));
//            
//            CompareResult compareResult = 
//                    getConnection().compare(compareRequest);
//            return compareResult.compareMatched();
//        }
//        catch (LDAPException e)
//        {
//            LdapDAO.checkLdapResult(e.getResultCode());
//            throw new RuntimeException("Unexpected LDAP exception", e);
//        }
//    }

    /**
     * Returns a member user identified by the X500Principal only. The
     * returned object has the fields required by the GMS.
     * Note that this method binds as a proxy user and not as the
     * subject.
     *
     * @param userDN
     * @return
     * @throws UserNotFoundException
     * @throws LDAPException
     */
    User<X500Principal> getMember(DN userDN)
            throws UserNotFoundException, LDAPException
    {
        Filter filter =
                Filter.createEqualityFilter("entrydn",
                                            userDN.toNormalizedString());

        SearchRequest searchRequest =
                new SearchRequest(this.config.getUsersDN(), SearchScope.SUB,
                                  filter, memberAttribs);

        SearchResultEntry searchResult =
                getConnection().searchForEntry(searchRequest);

        if (searchResult == null)
        {
            String msg = "Member not found " + userDN;
            logger.debug(msg);
            throw new UserNotFoundException(msg);
        }
        User<X500Principal> user = new User<X500Principal>(
                new X500Principal(searchResult.getAttributeValue(
                        userLdapAttrib.get(X500Principal.class))));
        String princ = searchResult.getAttributeValue(
                userLdapAttrib.get(HttpPrincipal.class));
        if (princ != null)
        {
            user.getIdentities().add(new HttpPrincipal(princ));
        }
        String fname = searchResult.getAttributeValue(LDAP_FNAME);
        String lname = searchResult.getAttributeValue(LDAP_LNAME);
        user.details.add(new PersonalDetails(fname, lname));
        return user;
    }


    DN getUserDN(User<? extends Principal> user)
            throws UserNotFoundException, TransientException
    {
        String searchField =
                userLdapAttrib.get(user.getUserID().getClass());
        if (searchField == null)
        {
            throw new IllegalArgumentException(
                    "Unsupported principal type " + user.getUserID()
                            .getClass());
        }
        
        // change the DN to be in the 'java' format
        if (user.getUserID() instanceof X500Principal)
        {
            X500Principal orderedPrincipal = AuthenticationUtil.getOrderedForm(
                (X500Principal) user.getUserID());
            searchField = "(" + searchField + "=" + orderedPrincipal.toString() + ")";
        }
        else
        {
            searchField = "(" + searchField + "=" + user.getUserID().getName()
                    + ")";
        }
        
        logger.debug("Search field is: " + searchField);

        SearchResultEntry searchResult = null;
        try
        {
            SearchRequest searchRequest =
                    new SearchRequest(this.config.getUsersDN(), SearchScope.SUB,
                                      searchField, "entrydn");


            searchResult =
                    getConnection().searchForEntry(searchRequest);

        }
        catch (LDAPException e)
        {
            LdapDAO.checkLdapResult(e.getResultCode());
        }

        if (searchResult == null)
        {
            String msg = "User not found " + user.getUserID().getName();
            logger.debug(msg);
            throw new UserNotFoundException(msg);
        }
        return searchResult.getAttributeValueAsDN("entrydn");
    }

}