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SUMMARY: INNER | FIELD | CONSTR | METHOD | DETAIL: FIELD | CONSTR | METHOD |
This interface encapsulates the GSS-API credentials for an entity. A credential contains all the necessary cryptographic information to enable the creation of a context on behalf of the entity that it represents. It may contain multiple, distinct, mechanism specific credential elements, each containing information for a specific security mechanism, but all referring to the same entity. A credential may be used to perform context initiation, acceptance, or both.
Credentials are instantiated using one of the createCredential methods in the GSSManager class. GSS-API credential creation is not intended to provide a "login to the network" function, as such a function would involve the creation of new credentials rather than merely acquiring a handle to existing credentials. GSS-API implementations must impose a local access-control policy on callers to prevent unauthorized callers from acquiring credentials to which they are not entitled.
Applications will create a credential object passing the desired parameters. The application can then use the query methods to obtain specific information about the instantiated credential object. When the credential is no longer needed, the application should call the dispose method to release any resources held by the credential object and to destroy any cryptographically sensitive information.
This example code demonstrates the creation of a GSSCredential implementation for a specific entity, querying of its fields, and its release when it is no longer needed:
GSSManager manager = GSSManager.getInstance(); // start by creating a name object for the entity GSSName name = manager.createName("myusername", GSSName.NT_USER_NAME); // now acquire credentials for the entity GSSCredential cred = manager.createCredential(name, GSSCredential.ACCEPT_ONLY); // display credential information - name, remaining lifetime, // and the mechanisms it has been acquired over System.out.println(cred.getName().toString()); System.out.println(cred.getRemainingLifetime()); Oid [] mechs = cred.getMechs(); if (mechs != null) { for (int i = 0; i < mechs.length; i++) System.out.println(mechs[i].toString()); } // release system resources held by the credential cred.dispose();
Field Summary | |
static int |
ACCEPT_ONLY
Credential usage flag requesting that it be able to be used for context acceptance only. |
static int |
DEFAULT_LIFETIME
A lifetime constant representing the default credential lifetime. |
static int |
INDEFINITE_LIFETIME
A lifetime constant representing indefinite credential lifetime. |
static int |
INITIATE_AND_ACCEPT
Credential usage flag requesting that it be able to be used for both context initiation and acceptance. |
static int |
INITIATE_ONLY
Credential usage flag requesting that it be able to be used for context initiation only. |
Method Summary | |
void |
add(GSSName name,
int initLifetime,
int acceptLifetime,
Oid mech,
int usage)
Adds a mechanism specific credential-element to an existing credential. |
void |
dispose()
Releases any sensitive information that the GSSCredential object may be containing. |
boolean |
equals(Object another)
Tests if this GSSCredential asserts the same entity as the supplied object. |
Oid[] |
getMechs()
Returns a list of mechanisms supported by this credential. |
GSSName |
getName()
Retrieves the name of the entity that the credential asserts. |
GSSName |
getName(Oid mech)
Retrieves a Mechanism Name of the entity that the credential asserts. |
int |
getRemainingAcceptLifetime(Oid mech)
Returns the lifetime in seconds for the credential to remain capable of accepting security contexts using the specified mechanism. |
int |
getRemainingInitLifetime(Oid mech)
Returns the lifetime in seconds for the credential to remain capable of initiating security contexts using the specified mechanism. |
int |
getRemainingLifetime()
Returns the remaining lifetime in seconds for a credential. |
int |
getUsage()
Returns the credential usage mode. |
int |
getUsage(Oid mech)
Returns the credential usage mode for a specific mechanism. |
int |
hashCode()
Returns a hashcode value for this GSSCredential. |
Field Detail |
public static final int INITIATE_AND_ACCEPT
public static final int INITIATE_ONLY
public static final int ACCEPT_ONLY
public static final int DEFAULT_LIFETIME
public static final int INDEFINITE_LIFETIME
Method Detail |
public void dispose() throws GSSException
public GSSName getName() throws GSSException
public GSSName getName(Oid mech) throws GSSException
mech
- the Oid of the mechanism for which the mechanism name should
be returned.public int getRemainingLifetime() throws GSSException
public int getRemainingInitLifetime(Oid mech) throws GSSException
mech
- the Oid of the mechanism whose intiator credential element
should be queried.public int getRemainingAcceptLifetime(Oid mech) throws GSSException
mech
- the Oid of the mechanism whose acceptor credential element
should be queried.public int getUsage() throws GSSException
public int getUsage(Oid mech) throws GSSException
mech
- the Oid of the mechanism whose credentials usage mode is to
be determined.public Oid[] getMechs() throws GSSException
public void add(GSSName name, int initLifetime, int acceptLifetime, Oid mech, int usage) throws GSSException
Adds a mechanism specific credential-element to an existing credential. This method allows the construction of credentials, one mechanism at a time.
This routine is envisioned to be used mainly by context acceptors during the creation of acceptor credentials which are to be used with a variety of clients using different security mechanisms.
This routine adds the new credential element "in-place". To add the element in a new credential, first call clone to obtain a copy of this credential, then call its add method.
As always, GSS-API implementations must impose a local access-control policy on callers to prevent unauthorized callers from acquiring credentials to which they are not entitled.
name
- the name of the principal for whom this credential is to be
acquired. Use null to specify the default principal.initLifetime
- the number of seconds that the credential element
should remain valid for initiating of security contexts. Use
GSSCredential.INDEFINITE_LIFETIME to request that the credentials
have the maximum permitted lifetime for this. Use
GSSCredential.DEFAULT_LIFETIME to request default credential
lifetime for this.acceptLifetime
- the number of seconds that the credential element
should remain valid for accepting security contexts. Use
GSSCredential.INDEFINITE_LIFETIME to request that the credentials
have the maximum permitted lifetime for this. Use
GSSCredential.DEFAULT_LIFETIME to request default credential
lifetime for this.mech
- the mechanism over which the credential is to be acquired.usage
- the usage mode that this credential element should add to
the credential. The value of this parameter must be one of:
INITIATE_AND_ACCEPT, ACCEPT_ONLY, and INITIATE_ONLY.public boolean equals(Object another)
another
- another GSSCredential object for comparison to this one.public int hashCode()
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