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Krb5AcceptCredential.java
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Krb5AcceptCredential.java
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/*
* Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.security.jgss.krb5;
import java.io.IOException;
import org.ietf.jgss.*;
import sun.security.jgss.GSSCaller;
import sun.security.jgss.spi.*;
import sun.security.krb5.*;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.security.AccessController;
import java.security.AccessControlContext;
import javax.security.auth.DestroyFailedException;
/**
* Implements the krb5 acceptor credential element.
*
* @author Mayank Upadhyay
* @since 1.4
*/
public class Krb5AcceptCredential
implements Krb5CredElement {
private final Krb5NameElement name;
private final ServiceCreds screds;
private Krb5AcceptCredential(Krb5NameElement name, ServiceCreds creds) {
/*
* Initialize this instance with the data from the acquired
* KerberosKey. This class needs to be a KerberosKey too
* hence we can't just store a reference.
*/
this.name = name;
this.screds = creds;
}
static Krb5AcceptCredential getInstance(final GSSCaller caller, Krb5NameElement name)
throws GSSException {
final String serverPrinc = (name == null? null:
name.getKrb5PrincipalName().getName());
final AccessControlContext acc = AccessController.getContext();
ServiceCreds creds = null;
try {
creds = AccessController.doPrivileged(
new PrivilegedExceptionAction<ServiceCreds>() {
public ServiceCreds run() throws Exception {
return Krb5Util.getServiceCreds(
caller == GSSCaller.CALLER_UNKNOWN ? GSSCaller.CALLER_ACCEPT: caller,
serverPrinc, acc);
}});
} catch (PrivilegedActionException e) {
GSSException ge =
new GSSException(GSSException.NO_CRED, -1,
"Attempt to obtain new ACCEPT credentials failed!");
ge.initCause(e.getException());
throw ge;
}
if (creds == null)
throw new GSSException(GSSException.NO_CRED, -1,
"Failed to find any Kerberos credentails");
if (name == null) {
String fullName = creds.getName();
if (fullName != null) {
name = Krb5NameElement.getInstance(fullName,
Krb5MechFactory.NT_GSS_KRB5_PRINCIPAL);
}
}
return new Krb5AcceptCredential(name, creds);
}
/**
* Returns the principal name for this credential. The name
* is in mechanism specific format.
*
* @return GSSNameSpi representing principal name of this credential
* @exception GSSException may be thrown
*/
public final GSSNameSpi getName() throws GSSException {
return name;
}
/**
* Returns the init lifetime remaining.
*
* @return the init lifetime remaining in seconds
* @exception GSSException may be thrown
*/
public int getInitLifetime() throws GSSException {
return 0;
}
/**
* Returns the accept lifetime remaining.
*
* @return the accept lifetime remaining in seconds
* @exception GSSException may be thrown
*/
public int getAcceptLifetime() throws GSSException {
return GSSCredential.INDEFINITE_LIFETIME;
}
public boolean isInitiatorCredential() throws GSSException {
return false;
}
public boolean isAcceptorCredential() throws GSSException {
return true;
}
/**
* Returns the oid representing the underlying credential
* mechanism oid.
*
* @return the Oid for this credential mechanism
* @exception GSSException may be thrown
*/
public final Oid getMechanism() {
return Krb5MechFactory.GSS_KRB5_MECH_OID;
}
public final java.security.Provider getProvider() {
return Krb5MechFactory.PROVIDER;
}
public EncryptionKey[] getKrb5EncryptionKeys(PrincipalName princ) {
return screds.getEKeys(princ);
}
/**
* Called to invalidate this credential element.
*/
public void dispose() throws GSSException {
try {
destroy();
} catch (DestroyFailedException e) {
GSSException gssException =
new GSSException(GSSException.FAILURE, -1,
"Could not destroy credentials - " + e.getMessage());
gssException.initCause(e);
}
}
/**
* Destroys the locally cached EncryptionKey value and then calls
* destroy in the base class.
*/
public void destroy() throws DestroyFailedException {
screds.destroy();
}
/**
* Impersonation is only available on the initiator side. The
* service must starts as an initiator to get an initial TGT to complete
* the S4U2self protocol.
*/
@Override
public GSSCredentialSpi impersonate(GSSNameSpi name) throws GSSException {
Credentials cred = screds.getInitCred();
if (cred != null) {
return Krb5InitCredential.getInstance(this.name, cred)
.impersonate(name);
} else {
throw new GSSException(GSSException.FAILURE, -1,
"Only an initiate credentials can impersonate");
}
}
}