Spring Security LDAP authentication user must be a member of an AD group

Question

I've configured the Spring Boot Security as per: https://spring.io/guides/gs/securing-web/

I am able to login using my credentials perfectly. However, I need to add a checking that the AD user must also belong to a specific AD group (ie. AD-this-is-a-specific-group). On login, if the user does not belong to the specific AD group, then it should return a login error.

I've been searching for hours now and cannot seem to find a clear way to do this in the WebSecurityConfigurerAdapter , am I using the auth.groupSearchFilter correctly?

Here is my code:

@Configuration 
@EnableWebSecurity    
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

@Autowired
Environment env;

public LdapContextSource contextSource () {
    LdapContextSource contextSource= new LdapContextSource();

    contextSource.setUrl(env.getRequiredProperty("ldap.url"));
    contextSource.setBase(env.getRequiredProperty("ldap.baseDn"));
    contextSource.setUserDn(env.getRequiredProperty("ldap.bindDn"));
    contextSource.setPassword(env.getRequiredProperty("ldap.batchPassword"));
    contextSource.afterPropertiesSet();
    return contextSource;
}

@Override
protected void configure(AuthenticationManagerBuilder auth)
        throws Exception {
     auth.ldapAuthentication()
        .userSearchFilter("(cn={0})")           
        .groupSearchBase("OU=Account Groups,OU=ITS Security")
        .groupSearchFilter("(cn=AD-this-is-a-specific-group)") 
        .contextSource(contextSource()); 
}

@Override
protected void configure(HttpSecurity http) throws Exception {
    http.authorizeRequests().anyRequest().fullyAuthenticated()
        .and()
        .formLogin();
}

Answer 1

I am sorry for beeing 5 years late for the party but I had the exact same problem with my very simple LDAP authentication implemented in Spring Boot.

I only wanted this: - Is it the correct username? - Is it the correct password? - If yes, is the usr in group MYGROUP?

So my configure method now looks really small. I added the populator in a separate bean, just realize that I needed to add it in "auth.ldapAuthentication" so it would be called.

@Override
public void configure(AuthenticationManagerBuilder auth) throws Exception {

auth.ldapAuthentication()
        .userSearchFilter("uid={0}")
        .ldapAuthoritiesPopulator(ldapAuthoritiesPopulator())
        .groupSearchFilter("(member={0})") 
        .contextSource(contextSource());
}

@Bean
public LdapAuthoritiesPopulator ldapAuthoritiesPopulator() {

DefaultLdapAuthoritiesPopulator populi = new DefaultLdapAuthoritiesPopulator(contextSource(), "") {

    @Override
    public Set<GrantedAuthority> getGroupMembershipRoles(String userDn, String username) {
        Set<GrantedAuthority> groupMembershipRoles = super.getGroupMembershipRoles(userDn, username);

        boolean isMemberOfSpecificAdGroup = false;
        for (GrantedAuthority grantedAuthority : groupMembershipRoles) {

            if ("ROLE_MYGROUP".equals(grantedAuthority.toString())) {
                isMemberOfSpecificAdGroup = true;
                break;
            }
        }

        if (!isMemberOfSpecificAdGroup) {

            throw new BadCredentialsException("User must be a member of " + "ROLE_MYGROUP");
        }
        return groupMembershipRoles;
    }
};

    return populi;
}

@Bean
public DefaultSpringSecurityContextSource contextSource() {
    return new DefaultSpringSecurityContextSource("ldap://blabla-some-url:389/dc=something,dc=something,dc=ch");
    }

And by the way: The url did not work like mentioned in the Spring Boot guide it only worked like this, like everything in one line:

return new DefaultSpringSecurityContextSource("ldap://blabla-some-url:389/dc=something,dc=something,dc=ch");

And by the way for everyone following that guide: If you connect to an already existing LDAP server you don't need all those "spring.ldap.embedded" application properties.

So thank you alot for your help!

Answer 2

Not sure if this is the best way to do this (in terms of Spring Security's lifecycle), but basically I provided my own DefaultLdapAuthoritiesPopulator, where I only override the getGroupMembershipRoles.

First thing though, I have wrong auth.groupSearchFilter above, it should be:

    .groupSearchFilter("(member={0})") 

Second, I've created an anonymous class with overridden method (that calls the super and checks for a the membership in the list of roles):

auth
        .ldapAuthentication()
        .ldapAuthoritiesPopulator(new DefaultLdapAuthoritiesPopulator(contextSource, "OU=Account Groups,OU=ITS Security") {

            @Override
            public Set<GrantedAuthority> getGroupMembershipRoles(String userDn, String username) {
                Set<GrantedAuthority> groupMembershipRoles = super.getGroupMembershipRoles(userDn, username);

                boolean isMemberOfSpecificAdGroup = false;
                for (GrantedAuthority grantedAuthority : groupMembershipRoles) {

                    if ("ROLE_AD-this-is-a-specific-group".equals(grantedAuthority.toString())) {                                                       
                        isMemberOfSpecificAdGroup = true;
                        break;
                    }
                }

                if (!isMemberOfSpecificAdGroup ) {

                    throw new BadCredentialsException("User must be a member of " + "AD-this-is-a-specific-group");
                }
                return groupMembershipRoles;
            }
        })
        .userSearchFilter("(cn={0})")           
        .groupSearchBase("OU=Account Groups,OU=ITS Security")
        .groupSearchFilter("(member={0})") 
        .contextSource(contextSource); 

Answer 3

I'll put this here since I think it's the easier way without overriding any method.

In user search filter (i'll use yours) add the following if it corresponds to your LDAP structure

Original:

.userSearchFilter("(cn={0})") 

Modified to search roles:

.userSearchFilter("(&(cn={0})(memberOf=CN=MYGROUP,OU=GROUP,DC=com,DC=company)")

This searches both the user and the membership

In my case I had to do this because I have 3 possible roles:

(&(cn={0})(|(group1)(group2)(group3)))

As you can see it searches user AND 1 OR more roles

Credit to this question's answer: Spring Security Ldap, log in only users in specified group