ActiveDirectoryRealm.java

package com.hwlcn.security.realm.activedirectory;

import com.hwlcn.security.authc.AuthenticationInfo;
import com.hwlcn.security.authc.AuthenticationToken;
import com.hwlcn.security.authc.SimpleAuthenticationInfo;
import com.hwlcn.security.authc.UsernamePasswordToken;
import com.hwlcn.security.authz.AuthorizationInfo;
import com.hwlcn.security.authz.SimpleAuthorizationInfo;
import com.hwlcn.security.realm.ldap.AbstractLdapRealm;
import com.hwlcn.security.realm.ldap.LdapUtils;
import com.hwlcn.security.subject.PrincipalCollection;
import com.hwlcn.security.realm.ldap.LdapContextFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.naming.NamingEnumeration;
import javax.naming.NamingException;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.SearchControls;
import javax.naming.directory.SearchResult;
import javax.naming.ldap.LdapContext;
import java.util.*;



public class ActiveDirectoryRealm extends AbstractLdapRealm {


    private static final Logger log = LoggerFactory.getLogger(ActiveDirectoryRealm.class);

    private static final String ROLE_NAMES_DELIMETER = ",";

    private Map<String, String> groupRolesMap;

    public void setGroupRolesMap(Map<String, String> groupRolesMap) {
        this.groupRolesMap = groupRolesMap;
    }

    protected AuthenticationInfo queryForAuthenticationInfo(AuthenticationToken token, LdapContextFactory ldapContextFactory) throws NamingException {

        UsernamePasswordToken upToken = (UsernamePasswordToken) token;

        LdapContext ctx = null;
        try {
            ctx = ldapContextFactory.getLdapContext(upToken.getUsername(), String.valueOf(upToken.getPassword()));
        } finally {
            LdapUtils.closeContext(ctx);
        }

        return buildAuthenticationInfo(upToken.getUsername(), upToken.getPassword());
    }



    protected AuthenticationInfo buildAuthenticationInfo(String username, char[] password) {
        return new SimpleAuthenticationInfo(username, password, getName());
    }

    protected AuthorizationInfo queryForAuthorizationInfo(PrincipalCollection principals, LdapContextFactory ldapContextFactory) throws NamingException {

        String username = (String) getAvailablePrincipal(principals);

        LdapContext ldapContext = ldapContextFactory.getSystemLdapContext();

        Set<String> roleNames;

        try {
            roleNames = getRoleNamesForUser(username, ldapContext);
        } finally {
            LdapUtils.closeContext(ldapContext);
        }

        return buildAuthorizationInfo(roleNames);
    }

    protected AuthorizationInfo buildAuthorizationInfo(Set<String> roleNames) {
        return new SimpleAuthorizationInfo(roleNames);
    }

    private Set<String> getRoleNamesForUser(String username, LdapContext ldapContext) throws NamingException {
        Set<String> roleNames;
        roleNames = new LinkedHashSet<String>();

        SearchControls searchCtls = new SearchControls();
        searchCtls.setSearchScope(SearchControls.SUBTREE_SCOPE);

        String userPrincipalName = username;
        if (principalSuffix != null) {
            userPrincipalName += principalSuffix;
        }

        String searchFilter = "(&(objectClass=*)(userPrincipalName={0}))";
        Object[] searchArguments = new Object[]{userPrincipalName};

        NamingEnumeration answer = ldapContext.search(searchBase, searchFilter, searchArguments, searchCtls);

        while (answer.hasMoreElements()) {
            SearchResult sr = (SearchResult) answer.next();

            if (log.isDebugEnabled()) {
                log.debug("Retrieving group names for user [" + sr.getName() + "]");
            }

            Attributes attrs = sr.getAttributes();

            if (attrs != null) {
                NamingEnumeration ae = attrs.getAll();
                while (ae.hasMore()) {
                    Attribute attr = (Attribute) ae.next();

                    if (attr.getID().equals("memberOf")) {

                        Collection<String> groupNames = LdapUtils.getAllAttributeValues(attr);

                        if (log.isDebugEnabled()) {
                            log.debug("Groups found for user [" + username + "]: " + groupNames);
                        }

                        Collection<String> rolesForGroups = getRoleNamesForGroups(groupNames);
                        roleNames.addAll(rolesForGroups);
                    }
                }
            }
        }
        return roleNames;
    }

    protected Collection<String> getRoleNamesForGroups(Collection<String> groupNames) {
        Set<String> roleNames = new HashSet<String>(groupNames.size());

        if (groupRolesMap != null) {
            for (String groupName : groupNames) {
                String strRoleNames = groupRolesMap.get(groupName);
                if (strRoleNames != null) {
                    for (String roleName : strRoleNames.split(ROLE_NAMES_DELIMETER)) {

                        if (log.isDebugEnabled()) {
                            log.debug("User is member of group [" + groupName + "] so adding role [" + roleName + "]");
                        }

                        roleNames.add(roleName);

                    }
                }
            }
        }
        return roleNames;
    }

}