wishihadabettername wishihadabettername - 3 months ago 57
Java Question

how to accept self-signed certificates for JNDI/LDAP connections?

I need to connect to an LDAP directory over SSL.

In non-production environments, we use self-signed certificates which, of course, fails to validate with:

javax.naming.CommunicationException: simple bind failed: ldapserver:636 [Root exception is javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target]
at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:197)
at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2694)
at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:293)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:175)
at com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:193)
at com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:136)
at com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:66)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:667)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:288)
at javax.naming.InitialContext.init(InitialContext.java:223)
at javax.naming.ldap.InitialLdapContext.<init>(InitialLdapContext.java:134)


I am aware of how to use a custom trust manager for SSL-enabled connections, but don't know how to use one in connection with the JNDI API where I don't manage the actual connection. That is, where is the following standard setup will I be able to plug the trust manager?

Thanks in advance.

Hashtable env = new Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.sun.jndi.ldap.LdapCtxFactory");
env.put(Context.PROVIDER_URL, "ldaps://ldapserver:636");
env.put(Context.SECURITY_PROTOCOL, "ssl");
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, "myUser");
env.put(Context.SECURITY_CREDENTIALS, "myPassword");
LdapContext ctx = new InitialLdapContext(env, null);
ctx.search (...)

Jcs Jcs
Answer

According to the JNDI documentation it seems possible to set a custom SSLSocketFactory

http://download.oracle.com/javase/1.5.0/docs/guide/jndi/jndi-ldap-gl.html#socket

public class MySSLSocketFactory extends SocketFactory {
    private SSLSocketFactory sf;

    public MySSLSocketFactory() {
        KeyStore keyStore = ... /* Get a keystore containing the self-signed certificate) */
        TrustManagerFactory tmf = TrustManagerFactory.getInstance();
        tmf.init(keyStore);
        SSLContext ctx = SSLContext.getInstance("TLS");
        ctx.init(null, tmf.getTrustManagers(), null);
        sf = ctx.getSocketFactory();
    }

    /* delegate SSLSocketFactory public methods to sf */
    ...
}

Configure the environment to use this socket factory

env.put("java.naming.ldap.factory.socket", "com.example.MySSLSocketFactory");