How to authenticate user from LDAP..

[Noman sadiq]

hello
can any One tell me how i create a method in which i authenticate user from LDAP using spring LDAP API...
i want user enter his/her cn and Password and i check these attributes from LDAP.. is it possible or is there any method which return me boolean when i pass cn and password

[bvar]

Noman,
The LDAP reference documentation talks about authentication here: http://static.springsource.org/sprin...ntication.html

[Noman sadiq]

thanks for your replay and link..
i am facing some compile time error when i try the first method which is in the link
Using ContextSource for user authentication

may be i am doing something wrong

 try {
	  ctx = ContextSource.getContext(userDn, credentials);
	    return true;

i am getting error in this line which is
The method getContext(String, String) is undefined for the type ContextSource

import interface from ldap is org.springframework.ldap.ContextSource



what is this can you tell me about it

[bvar]

You are trying to call getContext on ContextSource class. Instead, you need to create a new instance of ContextSource and invoke getContext on it. Here is a way to programatically create ContextSource

                LdapContextSource contextSource = new LdapContextSource();
		contextSource.setUrl("YOUR_LDAP_URL");                  
		contextSource.setUserDn("YOUR_OPTIONAL_ADMIN_USER_DN");
		contextSource.setPassword("YOUR_OPTIONAL_ADMIN_PWD");
		try {
			contextSource.afterPropertiesSet();
		}
		catch(Exception e) {
			e.printStackTrace();
		}
                ctx = contextSource.getContext(userDn, credentials);
    
                return true;

[Noman sadiq]

hi bvar
thanx for the code...

well it seem to be meaningless we again create ContextSource and provide the all the information which we already set in Spring configuration file...

there is not any sophisticated way to do this..

[bvar]

Ahh!! I didn't realize that you were using a configuration file. In that case, you can simply inject the context source. Right?

For example if this is your configuration:

     <bean id="contextSource" class="org.springframework.ldap.core.support.LdapContextSource">
        	<property name="url" value="XXXXXXX" />
        	<property name="userDn" value="XXXXXX" />
			<property name="password" value="XXXXXX" />
        	<property name="base" value=""/>
		</bean>

Then you can use the following code:

  import javax.naming.directory.DirContext;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.ldap.core.ContextSource;
import org.springframework.ldap.support.LdapUtils;

public class AuthenticationDao {
	
	@Autowired
	@Qualifier("contextSource")
	private ContextSource contextSource;
	
	public boolean authenticate(String userDn, String credentials) {
		  DirContext ctx = null;
		  try {
		    ctx = contextSource.getContext(userDn, credentials);
		    return true;
		  } catch (Exception e) {
		    // Context creation failed - authentication did not succeed
		    return false;
		  } finally {
		    // It is imperative that the created DirContext instance is always closed
		    LdapUtils.closeContext(ctx);
		  }
	}	  
}

[Noman sadiq]

hmmm ok nice to see your response but still facing problem...
i replace the class which you mention in contaxt bean
org.springframework.ldap.core.support.LdapContextS ource


now here is my spring configuration file.

<bean id="ldapContextSource"
class="org.springframework.ldap.core.support.LdapContextSource">
<property name="url" value="ldap://XXXXX:389" />
<property name="base" value="ou=schools,DC=lti-student,DC=test" />
<property name="userDn" value="XXXX" />
<property name="password" value="XXXX" />
</bean>

<bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate">
<constructor-arg ref="ldapContextSource" />
</bean> 
	
	<bean id="ldapContactDao"
		class="com.javaworld.sample.LDAPContactDAO">
		<property name="ldapTemplate" ref="ldapTemplate" />
	</bean>
</beans>

but with this configuration i am getting exception

Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'ldapContact' defined in class path resource [com/javaworld/sample/springldap.xml]: Initialization of bean failed; nested exception is org.springframework.beans.TypeMismatchException: Failed to convert property value of type [org.springframework.ldap.core.LdapTemplate] to required type [org.springframework.ldap.LdapTemplate] for property 'ldapTemplate'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [org.springframework.ldap.core.LdapTemplate] to required type [org.springframework.ldap.LdapTemplate] for property 'ldapTemplate': no matching editors or conversion strategy found
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:480)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory$1.run(AbstractAutowireCapableBeanFactory.java:409)
	at java.security.AccessController.doPrivileged(Native Method)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:380)
	at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:264)
	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222)
	at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:261)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:185)
	at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:164)
	at com.javaworld.sample.SpringFrameworkLDAPClient.main(SpringFrameworkLDAPClient.java:23)
Caused by: org.springframework.beans.TypeMismatchException: Failed to convert property value of type [org.springframework.ldap.core.LdapTemplate] to required type [org.springframework.ldap.LdapTemplate] for property 'ldapTemplate'; nested exception is java.lang.IllegalArgumentException: Cannot convert value of type [org.springframework.ldap.core.LdapTemplate] to required type [org.springframework.ldap.LdapTemplate] for property 'ldapTemplate': no matching editors or conversion strategy found
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:391)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.convertForProperty(AbstractAutowireCapableBeanFactory.java:1289)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1250)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1010)
	at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:472)
	... 9 more
Caused by: java.lang.IllegalArgumentException: Cannot convert value of type [org.springframework.ldap.core.LdapTemplate] to required type [org.springframework.ldap.LdapTemplate] for property 'ldapTemplate': no matching editors or conversion strategy found
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:231)
	at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:138)
	at org.springframework.beans.BeanWrapperImpl.convertForProperty(BeanWrapperImpl.java:386)
	... 13 more

what is this can you please tell me about it i also googling on that