Java Globus API: Interface ExtendedGSSContext

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org.gridforum.jgss
Interface ExtendedGSSContext

All Superinterfaces:: GSSContext

All Known Implementing Classes:: GlobusGSSContextImpl

public interface ExtendedGSSContext
extends GSSContext

Defines Java API for setting and getting context options and delegation extensions as defined in the GSS-API Extensions document. Some of the functions might not specify all the parameters as in the document.

Notes:

Extensions are not supported in initDelegation and acceptDelegation

Here is a sample code showing how the delegation API might be used:

 ExtendedGSSContext client = ....
 ExtendedGSSContext server = ....
 
 byte [] input = new byte[0];
 byte [] output = null;
 do {
	    output = client.initDelegation(null, null, 0, input, 0, input.length);
 	    input = server.acceptDelegation(0, output, 0, output.length);
 } while (!client.isDelegationFinished());

 GSSCredential cred = server.getDelegatedCredential();
 ...

Because delegation can be performed multiple times on the same contexts, the do { ... } while (); block should be used to properly reset the delegation state (The state of isDelegationFinished is reset on the initial call to initDelegation or acceptDelegation.

Fields inherited from interface org.ietf.jgss.GSSContext

DEFAULT_LIFETIME, INDEFINITE_LIFETIME

Method Summary
`byte[]`	`acceptDelegation(int lifetime, byte[] but, int off, int len)` Accept a delegated credential.
`GSSCredential`	`getDelegatedCredential()` Returns the delegated credential that was delegated using the `initDelegation` and `acceptDelegation` functions.
`Object`	`getOption(Oid option)` Gets a context option.
`byte[]`	`initDelegation(GSSCredential cred, Oid mechanism, int lifetime, byte[] buf, int off, int len)` Initiate the delegation of a credential.
`boolean`	`isDelegationFinished()` Used during delegation to determine the state of the delegation.
`void`	`setOption(Oid option, Object value)` Sets a context option.

Methods inherited from interface org.ietf.jgss.GSSContext

acceptSecContext, acceptSecContext, dispose, export, getAnonymityState, getConfState, getCredDelegState, getDelegCred, getIntegState, getLifetime, getMech, getMIC, getMIC, getMutualAuthState, getReplayDetState, getSequenceDetState, getSrcName, getTargName, getWrapSizeLimit, initSecContext, initSecContext, isEstablished, isInitiator, isProtReady, isTransferable, requestAnonymity, requestConf, requestCredDeleg, requestInteg, requestLifetime, requestMutualAuth, requestReplayDet, requestSequenceDet, setChannelBinding, unwrap, unwrap, verifyMIC, verifyMIC, wrap, wrap

Method Detail

setOption

public void setOption(Oid option,
                      Object value)
               throws GSSException

Sets a context option. It can be called by context initiator or acceptor but prior to the first call to initSecContext, acceptSecContext, initDelegation or acceptDelegation.

Parameters:: option - option type.; value - option value.
Throws:: GSSException - containing the following major error codes: GSSException.FAILURE

getOption

public Object getOption(Oid option)
                 throws GSSException

Gets a context option. It can be called by context initiator or acceptor.

Parameters:: option - option type.
Returns:: value option value. Maybe be null.
Throws:: GSSException - containing the following major error codes: GSSException.FAILURE

initDelegation

public byte[] initDelegation(GSSCredential cred,
                             Oid mechanism,
                             int lifetime,
                             byte[] buf,
                             int off,
                             int len)
                      throws GSSException

Initiate the delegation of a credential. This functions drives the initiating side of the credential delegation process. It is expected to be called in tandem with the acceptDelegation function.

Parameters:: cred - The credential to be delegated. May be null in which case the credential associated with the security context is used.; mechanism - The desired security mechanism. May be null.; lifetime - The requested period of validity (seconds) of the delegated credential.
Returns:: A token that should be passed to acceptDelegation if isDelegationFinished returns false. May be null.
Throws:: GSSException - containing the following major error codes: GSSException.FAILURE

acceptDelegation

public byte[] acceptDelegation(int lifetime,
                               byte[] but,
                               int off,
                               int len)
                        throws GSSException

Accept a delegated credential. This functions drives the accepting side of the credential delegation process. It is expected to be called in tandem with the initDelegation function.

Parameters:: lifetime - The requested period of validity (seconds) of the delegated credential.
Returns:: A token that should be passed to initDelegation if isDelegationFinished returns false. May be null.
Throws:: GSSException - containing the following major error codes: GSSException.FAILURE

getDelegatedCredential

public GSSCredential getDelegatedCredential()

Returns the delegated credential that was delegated using the initDelegation and acceptDelegation functions. This is to be called on the delegation accepting side once once isDelegationFinished returns true.

Returns:: The delegated credential. Might be null if credential delegation is not finished.

isDelegationFinished

public boolean isDelegationFinished()

Used during delegation to determine the state of the delegation.

Returns:: true if delegation was completed, false otherwise.