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A pure-java CIFS/SMB client library
/*
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package jcifs.smb;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Arrays;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.DEROutputStream;
import org.bouncycastle.asn1.DERSequence;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import jcifs.CIFSException;
import jcifs.Configuration;
import jcifs.spnego.NegTokenInit;
import jcifs.spnego.NegTokenTarg;
import jcifs.spnego.SpnegoException;
import jcifs.spnego.SpnegoToken;
import jcifs.util.Hexdump;
/**
* This class used to wrap a {@link SSPContext} to provide SPNEGO feature.
*
* @author Shun
*
*/
class SpnegoContext implements SSPContext {
private static final Logger log = LoggerFactory.getLogger(SpnegoContext.class);
private static ASN1ObjectIdentifier SPNEGO_MECH_OID;
static {
try {
SPNEGO_MECH_OID = new ASN1ObjectIdentifier("1.3.6.1.5.5.2");
}
catch ( IllegalArgumentException e ) {
log.error("Failed to initialize OID", e);
}
}
private SSPContext mechContext;
private boolean firstResponse = true;
private boolean completed;
private ASN1ObjectIdentifier[] mechs;
private ASN1ObjectIdentifier selectedMech;
private ASN1ObjectIdentifier[] remoteMechs;
private boolean disableMic;
private boolean requireMic;
/**
* Instance a SpnegoContext object by wrapping a {@link SSPContext}
* with the same mechanism this {@link SSPContext} used.
*
* @param source
* the {@link SSPContext} to be wrapped
*/
SpnegoContext ( Configuration config, SSPContext source ) {
this(config, source, source.getSupportedMechs());
}
/**
* Instance a SpnegoContext object by wrapping a {@link SSPContext}
* with specified mechanism.
*
* @param source
* the {@link SSPContext} to be wrapped
* @param mech
* the mechanism is being used for this context.
*/
SpnegoContext ( Configuration config, SSPContext source, ASN1ObjectIdentifier[] mech ) {
this.mechContext = source;
this.mechs = mech;
this.disableMic = !config.isEnforceSpnegoIntegrity() && config.isDisableSpnegoIntegrity();
this.requireMic = config.isEnforceSpnegoIntegrity();
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#getSupportedMechs()
*/
@Override
public ASN1ObjectIdentifier[] getSupportedMechs () {
return new ASN1ObjectIdentifier[] {
SPNEGO_MECH_OID
};
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#getFlags()
*/
@Override
public int getFlags () {
return this.mechContext.getFlags();
}
@Override
public boolean isSupported ( ASN1ObjectIdentifier mechanism ) {
// prevent nesting
return false;
}
/**
* Determines what mechanism is being used for this context.
*
* @return the Oid of the mechanism being used
*/
ASN1ObjectIdentifier[] getMechs () {
return this.mechs;
}
/**
* @return the mechanisms announced by the remote end
*/
ASN1ObjectIdentifier[] getRemoteMechs () {
return this.remoteMechs;
}
/**
* Set what mechanism is being used for this context.
*
* @param mechs
*/
void setMechs ( ASN1ObjectIdentifier[] mechs ) {
this.mechs = mechs;
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#getNetbiosName()
*/
@Override
public String getNetbiosName () {
return null;
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#getSigningKey()
*/
@Override
public byte[] getSigningKey () throws CIFSException {
return this.mechContext.getSigningKey();
}
/**
* Initialize the GSSContext to provide SPNEGO feature.
*
* @param inputBuf
* @param offset
* @param len
* @return response token
*/
@Override
public byte[] initSecContext ( byte[] inputBuf, int offset, int len ) throws CIFSException {
SpnegoToken resp;
if ( this.completed ) {
throw new CIFSException("Already complete");
}
else if ( len == 0 ) {
resp = initialToken();
}
else {
resp = negotitate(inputBuf, offset, len);
}
if ( resp == null ) {
return null;
}
return resp.toByteArray();
}
private SpnegoToken negotitate ( byte[] inputBuf, int offset, int len ) throws CIFSException {
SpnegoToken spToken = getToken(inputBuf, offset, len);
byte[] inputToken = null;
if ( spToken instanceof NegTokenInit ) {
NegTokenInit tinit = (NegTokenInit) spToken;
ASN1ObjectIdentifier[] rm = tinit.getMechanisms();
this.remoteMechs = rm;
ASN1ObjectIdentifier prefMech = rm[ 0 ];
// only use token if the optimistic mechanism is supported
if ( this.mechContext.isSupported(prefMech) ) {
inputToken = tinit.getMechanismToken();
}
else {
ASN1ObjectIdentifier found = null;
for ( ASN1ObjectIdentifier mech : rm ) {
if ( this.mechContext.isSupported(mech) ) {
found = mech;
break;
}
}
if ( found == null ) {
throw new SmbException("Server does advertise any supported mechanism");
}
}
}
else if ( spToken instanceof NegTokenTarg ) {
NegTokenTarg targ = (NegTokenTarg) spToken;
if ( this.firstResponse ) {
if ( !this.mechContext.isSupported(targ.getMechanism()) ) {
throw new SmbException("Server chose an unsupported mechanism " + targ.getMechanism());
}
this.selectedMech = targ.getMechanism();
if ( targ.getResult() == NegTokenTarg.REQUEST_MIC ) {
this.requireMic = true;
}
this.firstResponse = false;
}
else {
if ( targ.getMechanism() != null && !targ.getMechanism().equals(this.selectedMech) ) {
throw new SmbException("Server switched mechanism");
}
}
inputToken = targ.getMechanismToken();
}
else {
throw new SmbException("Invalid token");
}
if ( spToken instanceof NegTokenTarg && this.mechContext.isEstablished() ) {
// already established, but server hasn't completed yet
NegTokenTarg targ = (NegTokenTarg) spToken;
if ( targ.getResult() == NegTokenTarg.ACCEPT_INCOMPLETE && targ.getMechanismToken() == null && targ.getMechanismListMIC() != null ) {
// this indicates that mechlistMIC is required by the server
verifyMechListMIC(targ.getMechanismListMIC());
return new NegTokenTarg(NegTokenTarg.UNSPECIFIED_RESULT, null, null, calculateMechListMIC());
}
else if ( targ.getResult() != NegTokenTarg.ACCEPT_COMPLETED ) {
throw new SmbException("SPNEGO negotiation did not complete");
}
verifyMechListMIC(targ.getMechanismListMIC());
this.completed = true;
return null;
}
if ( inputToken == null ) {
return initialToken();
}
byte[] mechMIC = null;
byte[] responseToken = this.mechContext.initSecContext(inputToken, 0, inputToken.length);
if ( spToken instanceof NegTokenTarg ) {
NegTokenTarg targ = (NegTokenTarg) spToken;
if ( targ.getResult() == NegTokenTarg.ACCEPT_COMPLETED && this.mechContext.isEstablished() ) {
// server sent final token
verifyMechListMIC(targ.getMechanismListMIC());
if ( !this.disableMic || this.requireMic ) {
mechMIC = calculateMechListMIC();
}
this.completed = true;
}
else if ( this.mechContext.isMICAvailable() && ( !this.disableMic || this.requireMic ) ) {
// we need to send our final data
mechMIC = calculateMechListMIC();
}
else if ( targ.getResult() == NegTokenTarg.REJECTED ) {
throw new SmbException("SPNEGO mechanism was rejected");
}
}
if ( responseToken == null && this.mechContext.isEstablished() ) {
return null;
}
return new NegTokenTarg(NegTokenTarg.UNSPECIFIED_RESULT, null, responseToken, mechMIC);
}
private byte[] calculateMechListMIC () throws CIFSException {
if ( !this.mechContext.isMICAvailable() ) {
return null;
}
ASN1ObjectIdentifier[] lm = this.mechs;
byte[] ml = encodeMechs(lm);
byte[] mechanismListMIC = this.mechContext.calculateMIC(ml);
if ( log.isDebugEnabled() ) {
log.debug("Out Mech list " + Arrays.toString(lm));
log.debug("Out Mech list encoded " + Hexdump.toHexString(ml));
log.debug("Out Mech list MIC " + Hexdump.toHexString(mechanismListMIC));
}
return mechanismListMIC;
}
private void verifyMechListMIC ( byte[] mechanismListMIC ) throws CIFSException {
if ( this.disableMic ) {
return;
}
// No MIC verification if not present and not required
// or if the chosen mechanism is our preferred one
if ( ( mechanismListMIC == null || !this.mechContext.supportsIntegrity() ) && this.requireMic
&& !this.mechContext.isPreferredMech(this.selectedMech) ) {
throw new CIFSException("SPNEGO integrity is required but not available");
}
// otherwise we ignore the absence of a MIC
if ( !this.mechContext.isMICAvailable() || mechanismListMIC == null ) {
return;
}
try {
ASN1ObjectIdentifier[] lm = this.mechs;
byte[] ml = encodeMechs(lm);
if ( log.isInfoEnabled() ) {
log.debug("In Mech list " + Arrays.toString(lm));
log.debug("In Mech list encoded " + Hexdump.toHexString(ml));
log.debug("In Mech list MIC " + Hexdump.toHexString(mechanismListMIC));
}
this.mechContext.verifyMIC(ml, mechanismListMIC);
}
catch ( CIFSException e ) {
throw new CIFSException("Failed to verify mechanismListMIC", e);
}
}
/**
* @param mechs
* @return
* @throws CIFSException
*/
private static byte[] encodeMechs ( ASN1ObjectIdentifier[] mechs ) throws CIFSException {
try {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
DEROutputStream dos = new DEROutputStream(bos);
dos.writeObject(new DERSequence(mechs));
dos.close();
return bos.toByteArray();
}
catch ( IOException e ) {
throw new CIFSException("Failed to encode mechList", e);
}
}
private SpnegoToken initialToken () throws CIFSException {
byte[] mechToken = this.mechContext.initSecContext(new byte[0], 0, 0);
return new NegTokenInit(this.mechs, this.mechContext.getFlags(), mechToken, null);
}
@Override
public boolean isEstablished () {
return this.completed && this.mechContext.isEstablished();
}
private static SpnegoToken getToken ( byte[] token, int off, int len ) throws SpnegoException {
byte[] b = new byte[len];
if ( off == 0 && token.length == len ) {
b = token;
}
else {
System.arraycopy(token, off, b, 0, len);
}
return getToken(b);
}
private static SpnegoToken getToken ( byte[] token ) throws SpnegoException {
SpnegoToken spnegoToken = null;
try {
switch ( token[ 0 ] ) {
case (byte) 0x60:
spnegoToken = new NegTokenInit(token);
break;
case (byte) 0xa1:
spnegoToken = new NegTokenTarg(token);
break;
default:
throw new SpnegoException("Invalid token type");
}
return spnegoToken;
}
catch ( IOException e ) {
throw new SpnegoException("Invalid token");
}
}
@Override
public boolean supportsIntegrity () {
return this.mechContext.supportsIntegrity();
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#isPreferredMech(org.bouncycastle.asn1.ASN1ObjectIdentifier)
*/
@Override
public boolean isPreferredMech ( ASN1ObjectIdentifier mech ) {
return this.mechContext.isPreferredMech(mech);
}
@Override
public byte[] calculateMIC ( byte[] data ) throws CIFSException {
if ( !this.completed ) {
throw new CIFSException("Context is not established");
}
return this.mechContext.calculateMIC(data);
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#verifyMIC(byte[], byte[])
*/
@Override
public void verifyMIC ( byte[] data, byte[] mic ) throws CIFSException {
if ( !this.completed ) {
throw new CIFSException("Context is not established");
}
this.mechContext.verifyMIC(data, mic);
}
/**
* {@inheritDoc}
*
* @see jcifs.smb.SSPContext#isMICAvailable()
*/
@Override
public boolean isMICAvailable () {
if ( !this.completed ) {
return false;
}
return this.mechContext.isMICAvailable();
}
/**
* {@inheritDoc}
*
* @see java.lang.Object#toString()
*/
@Override
public String toString () {
return "SPNEGO[" + this.mechContext + "]";
}
/**
*
*/
@Override
public void dispose () throws CIFSException {
this.mechContext.dispose();
}
}
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