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spnego /
SpNegoContext.java
/*
* Copyright (c) 2005, 2018, 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.spnego;
import java.io.*;
import java.security.Provider;
import org.ietf.jgss.*;
import sun.security.action.GetBooleanAction;
import sun.security.jgss.*;
import sun.security.jgss.spi.*;
import sun.security.util.*;
/**
* Implements the mechanism specific context class for SPNEGO
* GSS-API mechanism
*
* @author Seema Malkani
* @since 1.6
*/
public class SpNegoContext implements GSSContextSpi {
/*
* The different states that this context can be in.
*/
private static final int STATE_NEW = 1;
private static final int STATE_IN_PROCESS = 2;
private static final int STATE_DONE = 3;
private static final int STATE_DELETED = 4;
private int state = STATE_NEW;
/*
* Optional features that the application can set and their default
* values.
*/
private boolean credDelegState = false;
private boolean mutualAuthState = true;
private boolean replayDetState = true;
private boolean sequenceDetState = true;
private boolean confState = true;
private boolean integState = true;
private boolean delegPolicyState = false;
private GSSNameSpi peerName = null;
private GSSNameSpi myName = null;
private SpNegoCredElement myCred = null;
private GSSContext mechContext = null;
private byte[] DER_mechTypes = null;
private int lifetime;
private ChannelBinding channelBinding;
private boolean initiator;
// the underlying negotiated mechanism
private Oid internal_mech = null;
// the SpNegoMechFactory that creates this context
final private SpNegoMechFactory factory;
// debug property
static final boolean DEBUG = GetBooleanAction
.privilegedGetProperty("sun.security.spnego.debug");
/**
* Constructor for SpNegoContext to be called on the context initiator's
* side.
*/
public SpNegoContext(SpNegoMechFactory factory, GSSNameSpi peerName,
GSSCredentialSpi myCred,
int lifetime) throws GSSException {
if (peerName == null)
throw new IllegalArgumentException("Cannot have null peer name");
if ((myCred != null) && !(myCred instanceof SpNegoCredElement)) {
throw new IllegalArgumentException("Wrong cred element type");
}
this.peerName = peerName;
this.myCred = (SpNegoCredElement) myCred;
this.lifetime = lifetime;
this.initiator = true;
this.factory = factory;
}
/**
* Constructor for SpNegoContext to be called on the context acceptor's
* side.
*/
public SpNegoContext(SpNegoMechFactory factory, GSSCredentialSpi myCred)
throws GSSException {
if ((myCred != null) && !(myCred instanceof SpNegoCredElement)) {
throw new IllegalArgumentException("Wrong cred element type");
}
this.myCred = (SpNegoCredElement) myCred;
this.initiator = false;
this.factory = factory;
}
/**
* Constructor for SpNegoContext to import a previously exported context.
*/
public SpNegoContext(SpNegoMechFactory factory, byte [] interProcessToken)
throws GSSException {
throw new GSSException(GSSException.UNAVAILABLE,
-1, "GSS Import Context not available");
}
/**
* Requests that confidentiality be available.
*/
public final void requestConf(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
confState = value;
}
/**
* Is confidentiality available?
*/
public final boolean getConfState() {
return confState;
}
/**
* Requests that integrity be available.
*/
public final void requestInteg(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
integState = value;
}
/**
* Requests that deleg policy be respected.
*/
public final void requestDelegPolicy(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
delegPolicyState = value;
}
/**
* Is integrity available?
*/
public final boolean getIntegState() {
return integState;
}
/**
* Is deleg policy respected?
*/
public final boolean getDelegPolicyState() {
if (isInitiator() && mechContext != null &&
mechContext instanceof GSSContextImpl &&
(state == STATE_IN_PROCESS || state == STATE_DONE)) {
return ((GSSContextImpl)mechContext).getDelegPolicyState();
} else {
return delegPolicyState;
}
}
/**
* Requests that credential delegation be done during context
* establishment.
*/
public final void requestCredDeleg(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
credDelegState = value;
}
/**
* Is credential delegation enabled?
*/
public final boolean getCredDelegState() {
if (isInitiator() && mechContext != null &&
(state == STATE_IN_PROCESS || state == STATE_DONE)) {
return mechContext.getCredDelegState();
} else {
return credDelegState;
}
}
/**
* Requests that mutual authentication be done during context
* establishment. Since this is fromm the client's perspective, it
* essentially requests that the server be authenticated.
*/
public final void requestMutualAuth(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator()) {
mutualAuthState = value;
}
}
/**
* Is mutual authentication enabled? Since this is from the client's
* perspective, it essentially meas that the server is being
* authenticated.
*/
public final boolean getMutualAuthState() {
return mutualAuthState;
}
/**
* Returns the mechanism oid.
*
* @return the Oid of this context
*/
public final Oid getMech() {
if (isEstablished()) {
return getNegotiatedMech();
}
return (SpNegoMechFactory.GSS_SPNEGO_MECH_OID);
}
public final Oid getNegotiatedMech() {
return (internal_mech);
}
public final Provider getProvider() {
return SpNegoMechFactory.PROVIDER;
}
public final void dispose() throws GSSException {
mechContext = null;
state = STATE_DELETED;
}
/**
* Tests if this is the initiator side of the context.
*
* @return boolean indicating if this is initiator (true)
* or target (false)
*/
public final boolean isInitiator() {
return initiator;
}
/**
* Tests if the context can be used for per-message service.
* Context may allow the calls to the per-message service
* functions before being fully established.
*
* @return boolean indicating if per-message methods can
* be called.
*/
public final boolean isProtReady() {
return (state == STATE_DONE);
}
/**
* Initiator context establishment call. This method may be
* required to be called several times. A CONTINUE_NEEDED return
* call indicates that more calls are needed after the next token
* is received from the peer.
*
* @param is contains the token received from the peer. On the
* first call it will be ignored.
* @return any token required to be sent to the peer
* It is responsibility of the caller to send the token
* to its peer for processing.
* @exception GSSException
*/
@Deprecated(since="11")
public final byte[] initSecContext(InputStream is, int mechTokenSize)
throws GSSException {
byte[] retVal = null;
NegTokenInit initToken = null;
byte[] mechToken = null;
int errorCode = GSSException.FAILURE;
if (DEBUG) {
System.out.println("Entered SpNego.initSecContext with " +
"state=" + printState(state));
}
if (!isInitiator()) {
throw new GSSException(GSSException.FAILURE, -1,
"initSecContext on an acceptor GSSContext");
}
try {
if (state == STATE_NEW) {
state = STATE_IN_PROCESS;
errorCode = GSSException.NO_CRED;
// determine available mech set
Oid[] mechList = getAvailableMechs();
DER_mechTypes = getEncodedMechs(mechList);
// pull out first mechanism
internal_mech = mechList[0];
// get the token for first mechanism
mechToken = GSS_initSecContext(null);
errorCode = GSSException.DEFECTIVE_TOKEN;
// generate SPNEGO token
initToken = new NegTokenInit(DER_mechTypes, getContextFlags(),
mechToken, null);
if (DEBUG) {
System.out.println("SpNegoContext.initSecContext: " +
"sending token of type = " +
SpNegoToken.getTokenName(initToken.getType()));
}
// get the encoded token
retVal = initToken.getEncoded();
} else if (state == STATE_IN_PROCESS) {
errorCode = GSSException.FAILURE;
if (is == null) {
throw new GSSException(errorCode, -1,
"No token received from peer!");
}
errorCode = GSSException.DEFECTIVE_TOKEN;
byte[] server_token = new byte[is.available()];
SpNegoToken.readFully(is, server_token);
if (DEBUG) {
System.out.println("SpNegoContext.initSecContext: " +
"process received token = " +
SpNegoToken.getHexBytes(server_token));
}
// read the SPNEGO token
// token will be validated when parsing
NegTokenTarg targToken = new NegTokenTarg(server_token);
if (DEBUG) {
System.out.println("SpNegoContext.initSecContext: " +
"received token of type = " +
SpNegoToken.getTokenName(targToken.getType()));
}
// pull out mechanism
internal_mech = targToken.getSupportedMech();
if (internal_mech == null) {
// return wth failure
throw new GSSException(errorCode, -1,
"supported mechanism from server is null");
}
// get the negotiated result
SpNegoToken.NegoResult negoResult = null;
int result = targToken.getNegotiatedResult();
switch (result) {
case 0:
negoResult = SpNegoToken.NegoResult.ACCEPT_COMPLETE;
state = STATE_DONE;
break;
case 1:
negoResult = SpNegoToken.NegoResult.ACCEPT_INCOMPLETE;
state = STATE_IN_PROCESS;
break;
case 2:
negoResult = SpNegoToken.NegoResult.REJECT;
state = STATE_DELETED;
break;
default:
state = STATE_DONE;
break;
}
errorCode = GSSException.BAD_MECH;
if (negoResult == SpNegoToken.NegoResult.REJECT) {
throw new GSSException(errorCode, -1,
internal_mech.toString());
}
errorCode = GSSException.DEFECTIVE_TOKEN;
if ((negoResult == SpNegoToken.NegoResult.ACCEPT_COMPLETE) ||
(negoResult == SpNegoToken.NegoResult.ACCEPT_INCOMPLETE)) {
// pull out the mechanism token
byte[] accept_token = targToken.getResponseToken();
if (accept_token == null) {
if (!isMechContextEstablished()) {
// return with failure
throw new GSSException(errorCode, -1,
"mechanism token from server is null");
}
} else {
mechToken = GSS_initSecContext(accept_token);
}
// verify MIC
if (!GSSUtil.useMSInterop()) {
byte[] micToken = targToken.getMechListMIC();
if (!verifyMechListMIC(DER_mechTypes, micToken)) {
throw new GSSException(errorCode, -1,
"verification of MIC on MechList Failed!");
}
}
if (isMechContextEstablished()) {
state = STATE_DONE;
retVal = mechToken;
if (DEBUG) {
System.out.println("SPNEGO Negotiated Mechanism = "
+ internal_mech + " " +
GSSUtil.getMechStr(internal_mech));
}
} else {
// generate SPNEGO token
initToken = new NegTokenInit(null, null,
mechToken, null);
if (DEBUG) {
System.out.println("SpNegoContext.initSecContext:" +
" continue sending token of type = " +
SpNegoToken.getTokenName(initToken.getType()));
}
// get the encoded token
retVal = initToken.getEncoded();
}
}
} else {
// XXX Use logging API
if (DEBUG) {
System.out.println(state);
}
}
if (DEBUG) {
if (retVal != null) {
System.out.println("SNegoContext.initSecContext: " +
"sending token = " + SpNegoToken.getHexBytes(retVal));
}
}
} catch (GSSException e) {
GSSException gssException =
new GSSException(errorCode, -1, e.getMessage());
gssException.initCause(e);
throw gssException;
} catch (IOException e) {
GSSException gssException =
new GSSException(GSSException.FAILURE, -1, e.getMessage());
gssException.initCause(e);
throw gssException;
}
return retVal;
}
/**
* Acceptor's context establishment call. This method may be
* required to be called several times. A CONTINUE_NEEDED return
* call indicates that more calls are needed after the next token
* is received from the peer.
*
* @param is contains the token received from the peer.
* @return any token required to be sent to the peer
* It is responsibility of the caller to send the token
* to its peer for processing.
* @exception GSSException
*/
@Deprecated(since="11")
public final byte[] acceptSecContext(InputStream is, int mechTokenSize)
throws GSSException {
byte[] retVal = null;
SpNegoToken.NegoResult negoResult;
boolean valid = true;
if (DEBUG) {
System.out.println("Entered SpNegoContext.acceptSecContext with " +
"state=" + printState(state));
}
if (isInitiator()) {
throw new GSSException(GSSException.FAILURE, -1,
"acceptSecContext on an initiator " +
"GSSContext");
}
try {
if (state == STATE_NEW) {
state = STATE_IN_PROCESS;
// read data
byte[] token = new byte[is.available()];
SpNegoToken.readFully(is, token);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"receiving token = " +
SpNegoToken.getHexBytes(token));
}
// read the SPNEGO token
// token will be validated when parsing
NegTokenInit initToken = new NegTokenInit(token);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"received token of type = " +
SpNegoToken.getTokenName(initToken.getType()));
}
Oid[] mechList = initToken.getMechTypeList();
DER_mechTypes = initToken.getMechTypes();
if (DER_mechTypes == null) {
valid = false;
}
/*
* Select the best match between the list of mechs
* that the initiator requested and the list that
* the acceptor will support.
*/
Oid[] supported_mechSet = getAvailableMechs();
Oid mech_wanted =
negotiate_mech_type(supported_mechSet, mechList);
if (mech_wanted == null) {
valid = false;
}
// save the desired mechanism
internal_mech = mech_wanted;
// get the token for mechanism
byte[] accept_token;
if (mechList[0].equals(mech_wanted) ||
(GSSUtil.isKerberosMech(mechList[0]) &&
GSSUtil.isKerberosMech(mech_wanted))) {
// get the mechanism token
if (DEBUG && !mech_wanted.equals(mechList[0])) {
System.out.println("SpNegoContext.acceptSecContext: " +
"negotiated mech adjusted to " + mechList[0]);
}
byte[] mechToken = initToken.getMechToken();
if (mechToken == null) {
throw new GSSException(GSSException.FAILURE, -1,
"mechToken is missing");
}
accept_token = GSS_acceptSecContext(mechToken);
mech_wanted = mechList[0];
} else {
accept_token = null;
}
// verify MIC
if (!GSSUtil.useMSInterop() && valid) {
valid = verifyMechListMIC(DER_mechTypes,
initToken.getMechListMIC());
}
// determine negotiated result status
if (valid) {
if (isMechContextEstablished()) {
negoResult = SpNegoToken.NegoResult.ACCEPT_COMPLETE;
state = STATE_DONE;
// now set the context flags for acceptor
setContextFlags();
// print the negotiated mech info
if (DEBUG) {
System.out.println("SPNEGO Negotiated Mechanism = "
+ internal_mech + " " +
GSSUtil.getMechStr(internal_mech));
}
} else {
negoResult = SpNegoToken.NegoResult.ACCEPT_INCOMPLETE;
state = STATE_IN_PROCESS;
}
} else {
negoResult = SpNegoToken.NegoResult.REJECT;
state = STATE_DELETED;
throw new GSSException(GSSException.FAILURE);
}
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"mechanism wanted = " + mech_wanted);
System.out.println("SpNegoContext.acceptSecContext: " +
"negotiated result = " + negoResult);
}
// generate SPNEGO token
NegTokenTarg targToken = new NegTokenTarg(negoResult.ordinal(),
mech_wanted, accept_token, null);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"sending token of type = " +
SpNegoToken.getTokenName(targToken.getType()));
}
// get the encoded token
retVal = targToken.getEncoded();
} else if (state == STATE_IN_PROCESS) {
// read data
byte[] token = new byte[is.available()];
SpNegoToken.readFully(is, token);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"receiving token = " +
SpNegoToken.getHexBytes(token));
}
// read the SPNEGO token
// token will be validated when parsing
NegTokenTarg inputToken = new NegTokenTarg(token);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"received token of type = " +
SpNegoToken.getTokenName(inputToken.getType()));
}
// read the token
byte[] client_token = inputToken.getResponseToken();
byte[] accept_token = GSS_acceptSecContext(client_token);
if (accept_token == null) {
valid = false;
}
// determine negotiated result status
if (valid) {
if (isMechContextEstablished()) {
negoResult = SpNegoToken.NegoResult.ACCEPT_COMPLETE;
state = STATE_DONE;
} else {
negoResult = SpNegoToken.NegoResult.ACCEPT_INCOMPLETE;
state = STATE_IN_PROCESS;
}
} else {
negoResult = SpNegoToken.NegoResult.REJECT;
state = STATE_DELETED;
throw new GSSException(GSSException.FAILURE);
}
// generate SPNEGO token
NegTokenTarg targToken = new NegTokenTarg(negoResult.ordinal(),
null, accept_token, null);
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"sending token of type = " +
SpNegoToken.getTokenName(targToken.getType()));
}
// get the encoded token
retVal = targToken.getEncoded();
} else {
// XXX Use logging API
if (DEBUG) {
System.out.println("AcceptSecContext: state = " + state);
}
}
if (DEBUG) {
System.out.println("SpNegoContext.acceptSecContext: " +
"sending token = " + SpNegoToken.getHexBytes(retVal));
}
} catch (IOException e) {
GSSException gssException =
new GSSException(GSSException.FAILURE, -1, e.getMessage());
gssException.initCause(e);
throw gssException;
}
if (state == STATE_DONE) {
// now set the context flags for acceptor
setContextFlags();
}
return retVal;
}
/**
* obtain the available mechanisms
*/
private Oid[] getAvailableMechs() {
if (myCred != null) {
Oid[] mechs = new Oid[1];
mechs[0] = myCred.getInternalMech();
return mechs;
} else {
return factory.availableMechs;
}
}
/**
* get ther DER encoded MechList
*/
private byte[] getEncodedMechs(Oid[] mechSet)
throws IOException, GSSException {
DerOutputStream mech = new DerOutputStream();
for (int i = 0; i < mechSet.length; i++) {
byte[] mechType = mechSet[i].getDER();
mech.write(mechType);
}
// insert in SEQUENCE
DerOutputStream mechTypeList = new DerOutputStream();
mechTypeList.write(DerValue.tag_Sequence, mech);
byte[] encoded = mechTypeList.toByteArray();
return encoded;
}
/**
* get the context flags
*/
private BitArray getContextFlags() {
BitArray out = new BitArray(7);
if (getCredDelegState()) out.set(0, true);
if (getMutualAuthState()) out.set(1, true);
if (getReplayDetState()) out.set(2, true);
if (getSequenceDetState()) out.set(3, true);
if (getConfState()) out.set(5, true);
if (getIntegState()) out.set(6, true);
return out;
}
// Only called on acceptor side. On the initiator side, most flags
// are already set at request. For those that might get chanegd,
// state from mech below is used.
private void setContextFlags() {
if (mechContext != null) {
// default for cred delegation is false
if (mechContext.getCredDelegState()) {
credDelegState = true;
}
// default for the following are true
if (!mechContext.getMutualAuthState()) {
mutualAuthState = false;
}
if (!mechContext.getReplayDetState()) {
replayDetState = false;
}
if (!mechContext.getSequenceDetState()) {
sequenceDetState = false;
}
if (!mechContext.getIntegState()) {
integState = false;
}
if (!mechContext.getConfState()) {
confState = false;
}
}
}
/**
* generate MIC on mechList. Not used at the moment.
*/
/*private byte[] generateMechListMIC(byte[] mechTypes)
throws GSSException {
// sanity check the required input
if (mechTypes == null) {
if (DEBUG) {
System.out.println("SpNegoContext: no MIC token included");
}
return null;
}
// check if mechanism supports integrity
if (!mechContext.getIntegState()) {
if (DEBUG) {
System.out.println("SpNegoContext: no MIC token included" +
" - mechanism does not support integrity");
}
return null;
}
// compute MIC on DER encoded mechanism list
byte[] mic = null;
try {
MessageProp prop = new MessageProp(0, true);
mic = getMIC(mechTypes, 0, mechTypes.length, prop);
if (DEBUG) {
System.out.println("SpNegoContext: getMIC = " +
SpNegoToken.getHexBytes(mic));
}
} catch (GSSException e) {
mic = null;
if (DEBUG) {
System.out.println("SpNegoContext: no MIC token included" +
" - getMIC failed : " + e.getMessage());
}
}
return mic;
}*/
/**
* verify MIC on MechList
*/
private boolean verifyMechListMIC(byte[] mechTypes, byte[] token)
throws GSSException {
// sanity check the input
if (token == null) {
if (DEBUG) {
System.out.println("SpNegoContext: no MIC token validation");
}
return true;
}
// check if mechanism supports integrity
if (!mechContext.getIntegState()) {
if (DEBUG) {
System.out.println("SpNegoContext: no MIC token validation" +
" - mechanism does not support integrity");
}
return true;
}
// now verify the token
boolean valid = false;
try {
MessageProp prop = new MessageProp(0, true);
verifyMIC(token, 0, token.length, mechTypes,
0, mechTypes.length, prop);
valid = true;
} catch (GSSException e) {
valid = false;
if (DEBUG) {
System.out.println("SpNegoContext: MIC validation failed! " +
e.getMessage());
}
}
return valid;
}
/**
* call gss_init_sec_context for the corresponding underlying mechanism
*/
private byte[] GSS_initSecContext(byte[] token) throws GSSException {
byte[] tok = null;
if (mechContext == null) {
// initialize mech context
GSSName serverName =
factory.manager.createName(peerName.toString(),
peerName.getStringNameType(), internal_mech);
GSSCredential cred = null;
if (myCred != null) {
// create context with provided credential
cred = new GSSCredentialImpl(factory.manager,
myCred.getInternalCred());
}
mechContext =
factory.manager.createContext(serverName,
internal_mech, cred, GSSContext.DEFAULT_LIFETIME);
mechContext.requestConf(confState);
mechContext.requestInteg(integState);
mechContext.requestCredDeleg(credDelegState);
mechContext.requestMutualAuth(mutualAuthState);
mechContext.requestReplayDet(replayDetState);
mechContext.requestSequenceDet(sequenceDetState);
if (mechContext instanceof GSSContextImpl) {
((GSSContextImpl)mechContext).requestDelegPolicy(
delegPolicyState);
}
}
// pass token
if (token != null) {
tok = token;
} else {
tok = new byte[0];
}
// pass token to mechanism initSecContext
byte[] init_token = mechContext.initSecContext(tok, 0, tok.length);
return init_token;
}
/**
* call gss_accept_sec_context for the corresponding underlying mechanism
*/
private byte[] GSS_acceptSecContext(byte[] token) throws GSSException {
if (mechContext == null) {
// initialize mech context
GSSCredential cred = null;
if (myCred != null) {
// create context with provided credential
cred = new GSSCredentialImpl(factory.manager,
myCred.getInternalCred());
}
mechContext = factory.manager.createContext(cred);
}
// pass token to mechanism acceptSecContext
byte[] accept_token =
mechContext.acceptSecContext(token, 0, token.length);
return accept_token;
}
/**
* This routine compares the recieved mechset to the mechset that
* this server can support. It looks sequentially through the mechset
* and the first one that matches what the server can support is
* chosen as the negotiated mechanism. If one is found, negResult
* is set to ACCEPT_COMPLETE, otherwise we return NULL and negResult
* is set to REJECT.
*/
private static Oid negotiate_mech_type(Oid[] supported_mechSet,
Oid[] mechSet) {
for (int i = 0; i < supported_mechSet.length; i++) {
for (int j = 0; j < mechSet.length; j++) {
if (mechSet[j].equals(supported_mechSet[i])) {
if (DEBUG) {
System.out.println("SpNegoContext: " +
"negotiated mechanism = " + mechSet[j]);
}
return (mechSet[j]);
}
}
}
return null;
}
public final boolean isEstablished() {
return (state == STATE_DONE);
}
public final boolean isMechContextEstablished() {
if (mechContext != null) {
return mechContext.isEstablished();
} else {
if (DEBUG) {
System.out.println("The underlying mechanism context has " +
"not been initialized");
}
return false;
}
}
public final byte [] export() throws GSSException {
throw new GSSException(GSSException.UNAVAILABLE, -1,
"GSS Export Context not available");
}
/**
* Sets the channel bindings to be used during context
* establishment.
*/
public final void setChannelBinding(ChannelBinding channelBinding)
throws GSSException {
this.channelBinding = channelBinding;
}
final ChannelBinding getChannelBinding() {
return channelBinding;
}
/*
* Anonymity is a little different in that after an application
* requests anonymity it will want to know whether the mechanism
* can support it or not, prior to sending any tokens across for
* context establishment. Since this is from the initiator's
* perspective, it essentially requests that the initiator be
* anonymous.
*/
public final void requestAnonymity(boolean value) throws GSSException {
// Ignore silently. Application will check back with
// getAnonymityState.
}
// RFC 2853 actually calls for this to be called after context
// establishment to get the right answer, but that is
// incorrect. The application may not want to send over any
// tokens if anonymity is not available.
public final boolean getAnonymityState() {
return false;
}
/**
* Requests the desired lifetime. Can only be used on the context
* initiator's side.
*/
public void requestLifetime(int lifetime) throws GSSException {
if (state == STATE_NEW && isInitiator())
this.lifetime = lifetime;
}
/**
* The lifetime remaining for this context.
*/
public final int getLifetime() {
if (mechContext != null) {
return mechContext.getLifetime();
} else {
return GSSContext.INDEFINITE_LIFETIME;
}
}
public final boolean isTransferable() throws GSSException {
return false;
}
/**
* Requests that sequence checking be done on the GSS wrap and MIC
* tokens.
*/
public final void requestSequenceDet(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
sequenceDetState = value;
}
/**
* Is sequence checking enabled on the GSS Wrap and MIC tokens?
* We enable sequence checking if replay detection is enabled.
*/
public final boolean getSequenceDetState() {
return sequenceDetState || replayDetState;
}
/**
* Requests that replay detection be done on the GSS wrap and MIC
* tokens.
*/
public final void requestReplayDet(boolean value) throws GSSException {
if (state == STATE_NEW && isInitiator())
replayDetState = value;
}
/**
* Is replay detection enabled on the GSS wrap and MIC tokens?
* We enable replay detection if sequence checking is enabled.
*/
public final boolean getReplayDetState() {
return replayDetState || sequenceDetState;
}
public final GSSNameSpi getTargName() throws GSSException {
// fill-in the GSSName
// get the peer name for the mechanism
if (mechContext != null) {
GSSNameImpl targName = (GSSNameImpl)mechContext.getTargName();
peerName = targName.getElement(internal_mech);
return peerName;
} else {
if (DEBUG) {
System.out.println("The underlying mechanism context has " +
"not been initialized");
}
return null;
}
}
public final GSSNameSpi getSrcName() throws GSSException {
// fill-in the GSSName
// get the src name for the mechanism
if (mechContext != null) {
GSSNameImpl srcName = (GSSNameImpl)mechContext.getSrcName();
myName = srcName.getElement(internal_mech);
return myName;
} else {
if (DEBUG) {
System.out.println("The underlying mechanism context has " +
"not been initialized");
}
return null;
}
}
/**
* Returns the delegated credential for the context. This
* is an optional feature of contexts which not all
* mechanisms will support. A context can be requested to
* support credential delegation by using the <b>CRED_DELEG</b>.
* This is only valid on the acceptor side of the context.
* @return GSSCredentialSpi object for the delegated credential
* @exception GSSException
* @see GSSContext#getCredDelegState
*/
public final GSSCredentialSpi getDelegCred() throws GSSException {
if (state != STATE_IN_PROCESS && state != STATE_DONE)
throw new GSSException(GSSException.NO_CONTEXT);
if (mechContext != null) {
GSSCredentialImpl delegCred =
(GSSCredentialImpl)mechContext.getDelegCred();
if (delegCred == null) {
return null;
}
// determine delegated cred element usage
boolean initiate = false;
if (delegCred.getUsage() == GSSCredential.INITIATE_ONLY) {
initiate = true;
}
GSSCredentialSpi mechCred =
delegCred.getElement(internal_mech, initiate);
SpNegoCredElement cred = new SpNegoCredElement(mechCred);
return cred.getInternalCred();
} else {
throw new GSSException(GSSException.NO_CONTEXT, -1,
"getDelegCred called in invalid state!");
}
}
public final int getWrapSizeLimit(int qop, boolean confReq,
int maxTokSize) throws GSSException {
if (mechContext != null) {
return mechContext.getWrapSizeLimit(qop, confReq, maxTokSize);
} else {
throw new GSSException(GSSException.NO_CONTEXT, -1,
"getWrapSizeLimit called in invalid state!");
}
}
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