问题
I'm trying to authenticate and then query our corporate LDAP using Spring LDAP and Spring security. I managed to make authentication work but when I attempt to run search I always get the following exception
In order to perform this operation a successful bind must be completed on the connection
After much research I have a theory that after I authenticate and before I can query I need to bind to connection. I just don't know what and how?
Just to mention - I can successfully browse and search our LDAP using JXplorer so my parameters are correct.
Here's section of my securityContext.xml
<security:http auto-config='true'>
<security:intercept-url pattern="/reports/goodbye.html"
access="ROLE_LOGOUT" />
<security:intercept-url pattern="/reports/**" access="ROLE_USER" />
<security:http-basic />
<security:logout logout-url="/reports/logout"
logout-success-url="/reports/goodbye.html" />
</security:http>
<security:ldap-server url="ldap://s140.foo.com:1389/dc=td,dc=foo,dc=com" />
<security:authentication-manager>
<security:authentication-provider ref="ldapAuthProvider">
</security:authentication-provider>
</security:authentication-manager>
<!-- Security beans -->
<bean id="contextSource" class="org.springframework.security.ldap.DefaultSpringSecurityContextSource">
<constructor-arg value="ldap://s140.foo.com:1389/dc=td,dc=foo,dc=com" />
</bean>
<bean id="ldapAuthProvider"
class="org.springframework.security.ldap.authentication.LdapAuthenticationProvider">
<constructor-arg>
<bean class="foo.bar.reporting.server.security.ldap.LdapAuthenticatorImpl">
<property name="contextFactory" ref="contextSource" />
<property name="principalPrefix" value="TD\" />
<property name="employee" ref="employee"></property>
</bean>
</constructor-arg>
<constructor-arg>
<bean class="foo.bar.reporting.server.security.ldap.LdapAuthoritiesPopulator" />
</constructor-arg>
</bean>
<!-- DAOs -->
<bean id="ldapTemplate" class="org.springframework.ldap.core.LdapTemplate">
<constructor-arg ref="contextSource" />
Here's code snippet from LdapAuthenticatorImpl that performs authentication. No problem here:
@Override
public DirContextOperations authenticate(final Authentication authentication) {
// Grab the username and password out of the authentication object.
final String name = authentication.getName();
final String principal = this.principalPrefix + name;
String password = "";
if (authentication.getCredentials() != null) {
password = authentication.getCredentials().toString();
}
if (!("".equals(principal.trim())) && !("".equals(password.trim()))) {
final InitialLdapContext ldapContext = (InitialLdapContext)
this.contextFactory.getContext(principal, password);
// We need to pass the context back out, so that the auth provider
// can add it to the Authentication object.
final DirContextOperations authAdapter = new DirContextAdapter();
authAdapter.addAttributeValue("ldapContext", ldapContext);
this.employee.setqId(name);
return authAdapter;
} else {
throw new BadCredentialsException("Blank username and/or password!");
}
}
And here's another code snippet from EmployeeDao with my futile attempt to query:
public List<Employee> queryEmployeesByName(String query)
throws BARServerException {
AndFilter filter = new AndFilter();
filter.and(new EqualsFilter("objectclass", "person"));
filter.and(new WhitespaceWildcardsFilter("cn", query));
try {
// the following line throws bind exception
List result = ldapTemplate.search(BASE, filter.encode(),
new AttributesMapper() {
@Override
public Employee mapFromAttributes(Attributes attrs)
throws NamingException {
Employee emp = new Employee((String) attrs.get("cn").get(),
(String) attrs.get("cn").get(),
(String) attrs.get("cn").get());
return emp;
}
});
return result;
} catch (Exception e) {
throw new BarServerException("Failed to query LDAP", e);
}
}
And lastly - the exception I'm getting
org.springframework.ldap.UncategorizedLdapException:
Uncategorized exception occured during LDAP processing; nested exception is
javax.naming.NamingException: [LDAP: error code 1 - 00000000: LdapErr:
DSID-0C090627, comment: In order to perform this operation a successful bind
must be completed on the connection., data 0, vece]; remaining name
'DC=TD,DC=FOO,DC=COM'
回答1:
It looks like your LDAP is configured to not allow a search without binding to it (no anonymous bind). Also you have implemented PasswordComparisonAuthenticator and not BindAuthenticator to authenticate to LDAP.
You could try modifying your queryEmployeesByName() method to bind and then search, looking at some examples in the doc.
回答2:
I'm going to accept @Raghuram answer mainly because it got me thinking in the right direction.
Why my code was failing? Turned out - the way I wired it I was trying to perform anonymous search which is prohibited by the system - hence the error.
How to rewire example above to work? First thing (and ugly thing at that) you need to provide user name and password of user that will be used to access the system. Very counterintuitive even when you login and authenticated, even if you are using BindAuthenticator system will not attempt to reuse your credentials. Bummer. So you need to stick 2 parameters into contextSource definition like so:
<bean id="contextSource" class="org.springframework.security.ldap.DefaultSpringSecurityContextSource">
<constructor-arg value="ldap://foo.com:389/dc=td,dc=foo,dc=com" />
<!-- TODO - need to hide this or encrypt a password -->
<property name="userDn" value="CN=admin,OU=Application,DC=TD,DC=FOO,DC=COM" />
<property name="password" value="blah" />
</bean>
Doing that allowed me to replace custom implementation of authenticator with generic BindAuthenticator and then my Java search started working
回答3:
I got the same error, couldn't find a solution. Finally I changed the application pool identity to network service and everything worked like a charm. (I have windows authentication and anonymous enabled on my site)
来源：https://stackoverflow.com/questions/5255158/spring-ldap-bind-for-successful-connection