LdapAuthenticationProvider throws NullPointerException at AbstractContextSource.getReadOnlyContext
I used Spring Security LDAP authentication defined in xml file and it worked fine:
<security:authentication-manager>
<security:ldap-authentication-provider
user-search-filter="(uid={0})"
user-search-base="dc=company,dc=com">
</security:ldap-authentication-provider>
</security:authentication-manager>
<security:ldap-server url="ldap://mail.company.com" />
I needed to insert some logic into authenticator provider (logging into database to name one) so I implemented DaoAuthenticationProvider to use LDAP:
xml configuration:
<security:authentication-manager>
<security:authentication-provider ref="appAuthenticationProvider" />
</security:authentication-manager>
class implementation:
@Service("appAuthenticationProvider")
public class AppAuthenticationProvider extends DaoAuthenticationProvider {
private LdapAuthenticationProvider ldapProvider;
public AppAuthenticationProvider(){
DefaultSpringSecurityContextSource contextSource = new DefaultSpringSecurityContextSource("ldap://mail.company.com");
BindAuthenticator authenticator = new BindAuthenticator(contextSource);
authenticator.setUserSearch(new FilterBasedLdapUserSearch("dc=company,dc=com", "(uid={0})", contextSource));
ldapProvider = new LdapAuthenticationProvider(authenticator);
}
public Authentication authenticate(Authentication authRequest) throws AuthenticationException {
return ldapProvider.authenticate(authRequest);
}
}
It looks qute what you'd expect from the first implementation but authenticate method throws following exception:
java.lang.NullPointerException
org.springframework.ldap.core.support.AbstractContextSource.getReadOnlyContext(AbstractContextSource.java:125)
org.springframework.ldap.core.LdapTemplate.executeReadOnly(LdapTemplate.java:792)
org.springframework.security.ldap.SpringSecurityLdapTemplate.searchForSingleEntry(SpringSecurityLdapTemplate.java:196)
org.springframework.security.ldap.search.FilterBasedLdapUserSearch.searchForUser(FilterBasedLdapUserSearch.java:116)
org.springframework.security.ldap.authentication.BindAuthenticator.authenticate(BindAuthenticator.java:90)
org.springframework.security.ldap.authentication.LdapAuthenticationProvider.doAuthentication(LdapAuthenticationProvider.java:178)
org.springframework.security.ldap.authentication.AbstractLdapAuthenticationProvider.authenticate(AbstractLdapAuthenticationProvider.java:61)
myapp.security.AppAuthenticationProvider.authenticate(AppAuthenticationProvider.java:69)
Logs in first case looks like this:
[myapp] 2012-05-16 11:38:44,339 INFO org.springframework.security.ldap.DefaultSpringSecurityContextSource - URL 'ldap://mail.company.com', root DN is ''
[myapp] 2012-05-16 11:38:44,364 INFO org.springframework.security.ldap.DefaultSpringSecurityContextSource - URL 'ldap://mail.company.com', root DN is ''
[myapp] 2012-05-16 11:38:44,365 DEBUG org.springframework.ldap.core.support.AbstractContextSource - AuthenticationSource not set - using default implementation
[myapp] 2012-05-16 11:38:44,365 INFO org.springframework.ldap.core.support.AbstractContextSource - Property 'userDn' not set - anonymous context will be used for read-write operations
[myapp] 2012-05-16 11:38:44,365 DEBUG org.springframework.ldap.core.support.AbstractContextSource - Using LDAP pooling.
[myapp] 2012-05-16 11:38:44,365 DEBUG org.springframework.ldap.core.support.AbstractContextSource - Trying provider Urls: ldap://mail.company.com
[myapp] 2012-05-16 11:38:44,369 INFO org.springframework.security.ldap.userdetails.DefaultLdapAuthoritiesPopulator - groupSearchBase is empty. Searches will be performed from the context source base
[myapp] 2012-05-16 11:39:33,956 DEBUG org.springframework.security.authentication.ProviderManager - Authentication attempt using org.springframework.security.ldap.authentication.LdapAuthenticationProvider
[myapp] 2012-05-16 11:39:33,957 DEBUG org.springframework.security.ldap.authentication.LdapAuthenticationProvider - Processing authentication request for user: JohnDoe
[myapp] 2012-05-16 11:39:33,960 DEBUG org.springframework.security.ldap.search.FilterBasedLdapUserSearch - Searching for user 'JohnDoe', with user search [ searchFilter: '(uid={0})', searchBase: 'dc=company,dc=com', scope: subtree, searchTimeLimit: 0, derefLinkFlag: false ]
[myapp] 2012-05-16 11:39:34,812 DEBUG org.springframework.ldap.core.support.AbstractContextSource - Got Ldap context on server 'ldap://mail.company.com'
[myapp] 2012-05-16 11:39:35,025 DEBUG org.springframework.security.ldap.SpringSecurityLdapTemplate - Searching for entry under DN '', base = 'dc=company,dc=com', filter = '(uid={0})'
[myapp] 2012-05-16 11:39:35,060 DEBUG org.springframework.security.ldap.SpringSecurityLdapTemplate - Found DN: cn=JohnDoe,cn=users,dc=company,dc=com
[myapp] 2012-05-16 11:39:35,082 DEBUG org.springframework.security.ldap.authentication.BindAuthenticator - Attempting to bind as cn=JohnDoe,cn=users,dc=company,dc=com
In the second case:
[myapp] 2012-05-16 11:34:13,563 INFO org.springframework.security.ldap.DefaultSpringSecurityContextSource - URL 'ldap://mail.company.com', root DN is ''
[myapp] 2012-05-16 11:34:28,363 INFO org.springframework.security.ldap.DefaultSpringSecurityContextSource - URL 'ldap://mail.company.com', root DN is ''
[myapp] 2012-05-16 11:34:37,194 DEBUG org.springframework.security.authentication.ProviderManager - Authentication attempt using myapp.security.AppAuthenticationProvider
[myapp] 2012-05-16 11:34:37,197 DEBUG org.springframework.security.ldap.authentication.LdapAuthenticationProvider - Processing authentication request for user: JohnDoe
[myapp] 2012-05-16 11:34:37,197 DEBUG org.springframework.security.ldap.search.FilterBasedLdapUserSearch - Searching for user 'JohnDoe', with user search [ searchFilter: '(uid={0})', searchBase: 'dc=company,dc=com', scope: subtree, searchTimeLimit: 0, derefLinkFlag: false ]
Got any idea?
Answer
You are not fully initializing the DefaultSpringSecurityContextSource (since you are creating it manually using "new").
Add this below the creation, and you should be all set:
contextSource.afterPropertiesSet();
In this particular case, this line is the key:
[myapp] 2012-05-16 11:38:44,365 INFO org.springframework.ldap.core.support.AbstractContextSource - Property 'userDn' not set - anonymous context will be used for read-write operations
When you try to use your manually created (but not properly initialized) context source it's going by the default behavior, which to use non-anonymous access for read-only operations. Since you aren't specifying any manager dn or password, it fails with a NPE.
Properly initializing the instance (by calling afterPropertiesSet()) will set it up to use anonymous access for read-only since no user/pwd is specified.