/*
* @(#)StartTlsRequest.java 1.18 06/03/14
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
package javax.naming.ldap;
import java.util.Iterator;
import java.security.AccessController;
import java.security.PrivilegedAction;
import javax.naming.ConfigurationException;
import javax.naming.NamingException;
import com.sun.naming.internal.VersionHelper;
import sun.misc.Service;
/**
* This class implements the LDAPv3 Extended Request for StartTLS as
* defined in
* <a href="http://www.ietf.org/rfc/rfc2830.txt">Lightweight Directory
* Access Protocol (v3): Extension for Transport Layer Security</a>
*
* The object identifier for StartTLS is 1.3.6.1.4.1.1466.20037
* and no extended request value is defined.
*<p>
* <tt>StartTlsRequest</tt>/<tt>StartTlsResponse</tt> are used to establish
* a TLS connection over the existing LDAP connection associated with
* the JNDI context on which <tt>extendedOperation()</tt> is invoked.
* Typically, a JNDI program uses these classes as follows.
* <blockquote><pre>
* import javax.naming.ldap.*;
*
* // Open an LDAP association
* LdapContext ctx = new InitialLdapContext();
*
* // Perform a StartTLS extended operation
* StartTlsResponse tls =
* (StartTlsResponse) ctx.extendedOperation(new StartTlsRequest());
*
* // Open a TLS connection (over the existing LDAP association) and get details
* // of the negotiated TLS session: cipher suite, peer certificate, etc.
* SSLSession session = tls.negotiate();
*
* // ... use ctx to perform protected LDAP operations
*
* // Close the TLS connection (revert back to the underlying LDAP association)
* tls.close();
*
* // ... use ctx to perform unprotected LDAP operations
*
* // Close the LDAP association
* ctx.close;
* </pre></blockquote>
*
* @since 1.4
* @see StartTlsResponse
* @author Vincent Ryan
*/
public class StartTlsRequest implements ExtendedRequest {
// Constant
/**
* The StartTLS extended request's assigned object identifier
* is 1.3.6.1.4.1.1466.20037.
*/
public static final String OID = "1.3.6.1.4.1.1466.20037";
// Constructors
/**
* Constructs a StartTLS extended request.
*/
public StartTlsRequest() {
}
// ExtendedRequest methods
/**
* Retrieves the StartTLS request's object identifier string.
*
* @return The object identifier string, "1.3.6.1.4.1.1466.20037".
*/
public String getID() {
return OID;
}
/**
* Retrieves the StartTLS request's ASN.1 BER encoded value.
* Since the request has no defined value, null is always
* returned.
*
* @return The null value.
*/
public byte[] getEncodedValue() {
return null;
}
/**
* Creates an extended response object that corresponds to the
* LDAP StartTLS extended request.
* <p>
* The result must be a concrete subclass of StartTlsResponse
* and must have a public zero-argument constructor.
* <p>
* This method locates the implementation class by locating
* configuration files that have the name:
* <blockquote><tt>
* META-INF/services/javax.naming.ldap.StartTlsResponse
* </tt></blockquote>
* The configuration files and their corresponding implementation classes must
* be accessible to the calling thread's context class loader.
* <p>
* Each configuration file should contain a list of fully-qualified class
* names, one per line. Space and tab characters surrounding each name, as
* well as blank lines, are ignored. The comment character is <tt>'#'</tt>
* (<tt>0x23</tt>); on each line all characters following the first comment
* character are ignored. The file must be encoded in UTF-8.
* <p>
* This method will return an instance of the first implementation
* class that it is able to load and instantiate successfully from
* the list of class names collected from the configuration files.
* This method uses the calling thread's context classloader to find the
* configuration files and to load the implementation class.
* <p>
* If no class can be found in this way, this method will use
* an implementation-specific way to locate an implementation.
* If none is found, a NamingException is thrown.
*
* @param id The object identifier of the extended response.
* Its value must be "1.3.6.1.4.1.1466.20037" or null.
* Both values are equivalent.
* @param berValue The possibly null ASN.1 BER encoded value of the
* extended response. This is the raw BER bytes
* including the tag and length of the response value.
* It does not include the response OID.
* Its value is ignored because a Start TLS response
* is not expected to contain any response value.
* @param offset The starting position in berValue of the bytes to use.
* Its value is ignored because a Start TLS response
* is not expected to contain any response value.
* @param length The number of bytes in berValue to use.
* Its value is ignored because a Start TLS response
* is not expected to contain any response value.
* @return The StartTLS extended response object.
* @exception NamingException If a naming exception was encountered
* while creating the StartTLS extended response object.
*/
public ExtendedResponse createExtendedResponse(String id, byte[] berValue,
int offset, int length) throws NamingException {
// Confirm that the object identifier is correct
if ((id != null) && (!id.equals(OID))) {
throw new ConfigurationException(
"Start TLS received the following response instead of " +
OID + ": " + id);
}
StartTlsResponse resp = null;
Iterator ps = Service.providers(StartTlsResponse.class,
getContextClassLoader());
while (resp == null && privilegedHasNext(ps)) {
resp = (StartTlsResponse)ps.next();
}
if (resp != null) {
return resp;
}
try {
VersionHelper helper = VersionHelper.getVersionHelper();
Class clas = helper.loadClass(
"com.sun.jndi.ldap.ext.StartTlsResponseImpl");
resp = (StartTlsResponse) clas.newInstance();
} catch (IllegalAccessException e) {
throw wrapException(e);
} catch (InstantiationException e) {
throw wrapException(e);
} catch (ClassNotFoundException e) {
throw wrapException(e);
}
return resp;
}
/*
* Wrap an exception, thrown while attempting to load the StartTlsResponse
* class, in a configuration exception.
*/
private ConfigurationException wrapException(Exception e) {
ConfigurationException ce = new ConfigurationException(
"Cannot load implementation of javax.naming.ldap.StartTlsResponse");
ce.setRootCause(e);
return ce;
}
/*
* Acquire the class loader associated with this thread.
*/
private final ClassLoader getContextClassLoader() {
return (ClassLoader) AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
return Thread.currentThread().getContextClassLoader();
}
}
);
}
private final static boolean privilegedHasNext(final Iterator iter) {
Boolean answer = (Boolean) AccessController.doPrivileged(
new PrivilegedAction() {
public Object run() {
return Boolean.valueOf(iter.hasNext());
}
});
return answer.booleanValue();
}
private static final long serialVersionUID = 4441679576360753397L;
}