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package sun.security.jgss.krb5;
import org.ietf.jgss.*;
import sun.security.jgss.GSSCaller;
import sun.security.jgss.spi.*;
import java.io.IOException;
import sun.security.krb5.Credentials;
import sun.security.krb5.KrbException;
import sun.security.krb5.internal.Ticket;
import javax.security.auth.kerberos.KerberosTicket;
/**
* Implements the krb5 proxy credential element used in constrained
* delegation. It is used in both impersonation (where there is no Kerberos 5
* communication between the middle server and the client) and normal
* constrained delegation (where there is, but client has not called
* requestCredDeleg(true)).
* @since 1.8
*/
public class Krb5ProxyCredential
implements Krb5CredElement {
public final Krb5InitCredential self; // the middle server
private final Krb5NameElement client; // the client
// The ticket with cname=client and sname=self. This can be a normal
// service ticket or an S4U2self ticket.
public final Ticket tkt;
Krb5ProxyCredential(Krb5InitCredential self, Krb5NameElement client,
Ticket tkt) {
this.self = self;
this.tkt = tkt;
this.client = client;
}
// The client name behind the proxy
@Override
public final Krb5NameElement getName() throws GSSException {
return client;
}
@Override
public int getInitLifetime() throws GSSException {
// endTime of tkt is not used by KDC, and it's also not
// available in the case of kerberos constr deleg
return self.getInitLifetime();
}
@Override
public int getAcceptLifetime() throws GSSException {
return 0;
}
@Override
public boolean isInitiatorCredential() throws GSSException {
return true;
}
@Override
public boolean isAcceptorCredential() throws GSSException {
return false;
}
@Override
public final Oid getMechanism() {
return Krb5MechFactory.GSS_KRB5_MECH_OID;
}
@Override
public final java.security.Provider getProvider() {
return Krb5MechFactory.PROVIDER;
}
@Override
public void dispose() throws GSSException {
try {
self.destroy();
} catch (javax.security.auth.DestroyFailedException e) {
GSSException gssException =
new GSSException(GSSException.FAILURE, -1,
"Could not destroy credentials - " + e.getMessage());
gssException.initCause(e);
}
}
@Override
public GSSCredentialSpi impersonate(GSSNameSpi name) throws GSSException {
// Cannot impersonate multiple levels without the impersonatee's TGT.
throw new GSSException(GSSException.FAILURE, -1,
"Only an initiate credentials can impersonate");
}
// Try to see if a default credential should act as an impersonator.
static Krb5CredElement tryImpersonation(GSSCaller caller,
Krb5InitCredential initiator) throws GSSException {
try {
KerberosTicket proxy = initiator.proxyTicket;
if (proxy != null) {
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