# Interface ExtendedGSSContext

All Superinterfaces:
  `GSSContext`

public interface ExtendedGSSContext extends GSSContext
The extended GSSContext interface for supporting additional functionalities not defined by `org.ietf.jgss.GSSContext`, such as querying context-specific attributes.

Since:
  1.7

- ## Field Summary

  ### Fields declared in interface GSSContext

  `DEFAULT_LIFETIME, INDEFINITE_LIFETIME`
  Modifier and Type
  Field
  Description
  `static final int`
  `DEFAULT_LIFETIME`
  A lifetime constant representing the default context lifetime.
  `static final int`
  `INDEFINITE_LIFETIME`
  A lifetime constant representing indefinite context lifetime.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `boolean`
  `getDelegPolicyState()`
  Returns the delegation policy response.
  `Object`
  `inquireSecContext(InquireType type)`
  Return the mechanism-specific attribute associated with `type`.
  `void`
  `requestDelegPolicy(boolean state)`
  Requests that the delegation policy be respected.

  ### Methods declared in interface 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`
  Modifier and Type
  Method
  Description
  `byte[]`
  `acceptSecContext(byte[] inToken, int offset, int len)`
  Called by the context acceptor upon receiving a token from the peer.
  `void`
  `acceptSecContext(InputStream inStream, OutputStream outStream)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.
  `void`
  `dispose()`
  Releases any system resources and cryptographic information stored in the context object and invalidates the context.
  `byte[]`
  `export()`
  Exports this context so that another process may import it.
  `boolean`
  `getAnonymityState()`
  Determines if the context initiator is anonymously authenticated to the context acceptor.
  `boolean`
  `getConfState()`
  Determines if data confidentiality is available over the context.
  `boolean`
  `getCredDelegState()`
  Determines if credential delegation is enabled on this context.
  `GSSCredential`
  `getDelegCred()`
  Obtains the credentials delegated by the context initiator to the context acceptor.
  `boolean`
  `getIntegState()`
  Determines if data integrity is available over the context.
  `int`
  `getLifetime()`
  Determines what the remaining lifetime for this context is.
  `Oid`
  `getMech()`
  Determines what mechanism is being used for this context.
  `byte[]`
  `getMIC(byte[] inMsg, int offset, int len, MessageProp msgProp)`
  Returns a token containing a cryptographic Message Integrity Code (MIC) for the supplied message, for transfer to the peer application.
  `void`
  `getMIC(InputStream inStream, OutputStream outStream, MessageProp msgProp)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.
  `boolean`
  `getMutualAuthState()`
  Determines if mutual authentication is enabled on this context.
  `boolean`
  `getReplayDetState()`
  Determines if replay detection is enabled for the per-message security services from this context.
  `boolean`
  `getSequenceDetState()`
  Determines if sequence checking is enabled for the per-message security services from this context.
  `GSSName`
  `getSrcName()`
  Returns the name of the context initiator.
  `GSSName`
  `getTargName()`
  Returns the name of the context acceptor.
  `int`
  `getWrapSizeLimit(int qop, boolean confReq, int maxTokenSize)`
  Used to determine limits on the size of the message that can be passed to `wrap`.
  `byte[]`
  `initSecContext(byte[] inputBuf, int offset, int len)`
  Called by the context initiator to start the context creation phase and process any tokens generated by the peer's `acceptSecContext` method.
  `int`
  `initSecContext(InputStream inStream, OutputStream outStream)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.
  `boolean`
  `isEstablished()`
  Used during context establishment to determine the state of the context.
  `boolean`
  `isInitiator()`
  Determines if this is the context initiator.
  `boolean`
  `isProtReady()`
  Determines if the context is ready for per message operations to be used over it.
  `boolean`
  `isTransferable()`
  Determines if the context is transferable to other processes through the use of the `export` method.
  `void`
  `requestAnonymity(boolean state)`
  Requests that the initiator's identity not be disclosed to the acceptor.
  `void`
  `requestConf(boolean state)`
  Requests that data confidentiality be enabled for the `wrap` method.
  `void`
  `requestCredDeleg(boolean state)`
  Requests that the initiator's credentials be delegated to the acceptor during context establishment.
  `void`
  `requestInteg(boolean state)`
  Requests that data integrity be enabled for the `wrap` and `getMIC`methods.
  `void`
  `requestLifetime(int lifetime)`
  Requests a lifetime in seconds for the context.
  `void`
  `requestMutualAuth(boolean state)`
  Requests that mutual authentication be done during context establishment.
  `void`
  `requestReplayDet(boolean state)`
  Requests that replay detection be enabled for the per-message security services after context establishment.
  `void`
  `requestSequenceDet(boolean state)`
  Requests that sequence checking be enabled for the per-message security services after context establishment.
  `void`
  `setChannelBinding(ChannelBinding cb)`
  Sets the channel bindings to be used during context establishment.
  `byte[]`
  `unwrap(byte[] inBuf, int offset, int len, MessageProp msgProp)`
  Used to process tokens generated by the `wrap` method on the other side of the context.
  `void`
  `unwrap(InputStream inStream, OutputStream outStream, MessageProp msgProp)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.
  `void`
  `verifyMIC(byte[] inToken, int tokOffset, int tokLen, byte[] inMsg, int msgOffset, int msgLen, MessageProp msgProp)`
  Verifies the cryptographic MIC, contained in the token parameter, over the supplied message.
  `void`
  `verifyMIC(InputStream tokStream, InputStream msgStream, MessageProp msgProp)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.
  `byte[]`
  `wrap(byte[] inBuf, int offset, int len, MessageProp msgProp)`
  Applies per-message security services over the established security context.
  `void`
  `wrap(InputStream inStream, OutputStream outStream, MessageProp msgProp)`
  Deprecated.
  The stream-based methods have been removed from RFC 8353.

- ## Method Details

  - ### inquireSecContext

    Object inquireSecContext(InquireType type) throws GSSException
    Return the mechanism-specific attribute associated with `type`.

    Example:

             GSSContext ctxt = m.createContext(...)
             // Establishing the context
             if (ctxt instanceof ExtendedGSSContext) {
                 ExtendedGSSContext ex = (ExtendedGSSContext)ctxt;
                 try {
                     Key key = (key)ex.inquireSecContext(
                             InquireType.KRB5_GET_SESSION_KEY);
                     // read key info
                 } catch (GSSException gsse) {
                     // deal with exception
                 }
             }

    Parameters:
      `type` - the type of the attribute requested
    Returns:
      the attribute, see the method documentation for details.
    Throws:
      `GSSException` - containing the following major error codes: `GSSException.BAD_MECH` if the mechanism does not support this method, `GSSException.UNAVAILABLE` if the type specified is not supported, `GSSException.NO_CONTEXT` if the security context is invalid, `GSSException.FAILURE` for other unspecified failures.
    See Also:
      - `InquireType`

  - ### requestDelegPolicy

    void requestDelegPolicy(boolean state) throws GSSException
    Requests that the delegation policy be respected. When a true value is requested, the underlying context would use the delegation policy defined by the environment as a hint to determine whether credentials delegation should be performed. This request can only be made on the context initiator's side and it has to be done prior to the first call to `initSecContext`.

    When this flag is false, delegation will only be tried when the `credentials delegation flag` is true.

    When this flag is true but the `credentials delegation flag` is false, delegation will be only tried if the delegation policy permits delegation.

    When both this flag and the `credentials delegation flag` are true, delegation will be always tried. However, if the delegation policy does not permit delegation, the value of `getDelegPolicyState()` will be false, even if delegation is performed successfully.

    In any case, if the delegation is not successful, the value returned by `GSSContext.getCredDelegState()` is false, and the value returned by `getDelegPolicyState()` is also false.

    Not all mechanisms support delegation policy. Therefore, the application should check to see if the request was honored with the `getDelegPolicyState` method. When delegation policy is not supported, `requestDelegPolicy` should return silently without throwing an exception.

    Note: for the Kerberos 5 mechanism, the delegation policy is expressed through the OK-AS-DELEGATE flag in the service ticket. When it's true, the KDC permits delegation to the target server. In a cross-realm environment, in order for delegation be permitted, all cross-realm TGTs on the authentication path must also have the OK-AS-DELAGATE flags set.

    Parameters:
      `state` - true if the policy should be respected
    Throws:
      `GSSException` - containing the following major error codes: `GSSException.FAILURE`

  - ### getDelegPolicyState

    boolean getDelegPolicyState()
    Returns the delegation policy response. Called after a security context is established. This method can be only called on the initiator's side. See `requestDelegPolicy(boolean)`.
    Returns:
      the delegation policy response