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/* GSSCredential.java -- GSS credential interface.

   Copyright (C) 2004 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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   The documentation comments of this class are derived from the text

   of RFC 2853:  Generic Security Service API Version 2: Java Bindings.

   That document is covered under the following license notice:

Copyright (C) The Internet Society (2000).  All Rights Reserved.

This document and translations of it may be copied and furnished to

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or assist in its implementation may be prepared, copied, published and

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The limited permissions granted above are perpetual and will not be

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This document and the information contained herein is provided on an

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NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN

WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. */

package org.ietf.jgss;

/**

 * <p>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.</p>

 *

 * <p>A credential may be used to perform context initiation, acceptance,

 * or both.</p>

 *

 * <p>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.  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.  Such functions,

 * if required, should be defined in implementation-specific extensions

 * to the API.</p>

 *

 * <p>If credential acquisition is time-consuming for a mechanism, the

 * mechanism may choose to delay the actual acquisition until the

 * credential is required (e.g.  by {@link GSSContext}). Such mechanism-

 * specific implementation decisions should be invisible to the calling

 * application; thus the query methods immediately following the

 * creation of a credential object must return valid credential data,

 * and may therefore incur the overhead of a deferred credential

 * acquisition.</p>

 *

 * <p>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

 * (equivalent to the gss_inquire routines).  When the credential is no

 * longer needed, the application should call the dispose (equivalent to

 * gss_release_cred) method to release any resources held by the

 * credential object and to destroy any cryptographically sensitive

 * information.</p>

 *

 * <p>Classes implementing this interface also implement the {@link Cloneable}

 * interface. This indicates the the class will support the {@link

 * Cloneable#clone()} method that will allow the creation of duplicate

 * credentials. This is useful when called just before the {@link

 * #add(org.ietf.jgss.GSSName,int,int,org.ietf.jgss.Oid,int)} call to retain

 * a copy of the original credential.</p>

 *

 * <h3>Example Code</h3>

 *

 * <pre>

GSSManager mgr = GSSManager.getInstance();

// start by creating a name object for the entity

GSSName name = mgr.createName("userName", GSSName.NT_USER_NAME);

// now acquire credentials for the entity

GSSCredential cred = mgr.createCredential(name,

                                          GSSCredential.ACCEPT_ONLY);

// display credential information - name, remaining lifetime,

// and the mechanisms it has been acquired over

print(cred.getName().toString());

print(cred.getRemainingLifetime());

Oid [] mechs = cred.getMechs();

if (mechs != null)

  {

    for (int i = 0; i < mechs.length; i++)

      print(mechs[i].toString());

  }

// release system resources held by the credential

cred.dispose();

 * </pre>

 */

public interface GSSCredential extends Cloneable

{

  // Constants.

  // -------------------------------------------------------------------------

  /**

   * Credential usage flag requesting that it be able to be used for both

   * context initiation and acceptance.

   */

  int INITIATE_AND_ACCEPT = 0;

  /**

   * Credential usage flag requesting that it be able to be used for

   * context initiation only.

   */

  int INITIATE_ONLY = 1;

  /**

   * Credential usage flag requesting that it be able to be used for

   * context acceptance only.

   */

  int ACCEPT_ONLY = 2;

  /**

   * A lifetime constant representing the default credential lifetime.

   */

  int DEFAULT_LIFETIME = 0;

  /**

   * A lifetime constant representing indefinite credential lifetime.

   */

  int INDEFINITE_LIFETIME = Integer.MAX_VALUE;

  // Methods.

  // -------------------------------------------------------------------------

  /**

   * Releases any sensitive information that the GSSCredential object may

   * be containing.  Applications should call this method as soon as the

   * credential is no longer needed to minimize the time any sensitive

   * information is maintained.

   *

   * @throws GSSException If this operation fails.

   */

  void dispose() throws GSSException;

  /**

   * Retrieves the name of the entity that the credential asserts.

   *

   * @return The name.

   * @throws GSSException If this operation fails.

   */

  GSSName getName() throws GSSException;

  /**

   * Retrieves a mechanism name of the entity that the credential asserts.

   * Equivalent to calling {@link GSSName#canonicalize(org.ietf.jgss.Oid)}

   * on the name returned by {@link #getName()}.

   *

   * @param mechOID The mechanism for which information should be returned.

   * @return The name.

   * @throws GSSException If this operation fails.

   */

  GSSName getName(Oid mechOID) throws GSSException;

  /**

   * Returns the remaining lifetime in seconds for a credential.  The

   * remaining lifetime is the minimum lifetime for any of the underlying

   * credential mechanisms.  A return value of {@link

   * GSSCredential#INDEFINITE_LIFETIME} indicates that the credential does

   * not expire.  A return value of 0 indicates that the credential is

   * already expired.

   *

   * @return The remaining lifetime.

   * @throws GSSException If this operation fails.

   */

  int getRemainingLifetime() throws GSSException;

  /**

   * Returns the remaining lifetime is seconds for the credential to

   * remain capable of initiating security contexts under the specified

   * mechanism.  A return value of {@link GSSCredential#INDEFINITE_LIFETIME}

   * indicates that the credential does not expire for context initiation.

   * A return value of 0 indicates that the credential is already expired.

   *

   * @param mech The mechanism for which information should be returned.

   * @return The remaining lifetime.

   * @throws GSSException If this operation fails.

   */

  int getRemainingInitLifetime(Oid mech) throws GSSException;

  /**

   * Returns the remaining lifetime is seconds for the credential to

   * remain capable of accepting security contexts under the specified

   * mechanism.  A return value of {@link GSSCredential#INDEFINITE_LIFETIME}

   * indicates that the credential does not expire for context acceptance.

   * A return value of 0 indicates that the credential is already expired.

   *

   * @param mech The mechanism for which information should be returned.

   * @return The remaining lifetime.

   * @throws GSSException If this operation fails.

   */

  int getRemainingAcceptLifetime(Oid mech) throws GSSException;

  /**

   * Returns the credential usage flag.  The return value will be one of

   * {@link GSSCredential#INITIATE_ONLY}, {@link GSSCredential#ACCEPT_ONLY},

   * or {@link GSSCredential#INITIATE_AND_ACCEPT}.

   *

   * @return The credential usage flag.

   * @throws GSSException If this operation fails.

   */

  int getUsage() throws GSSException;

  /**

   * Returns the credential usage flag for the specified credential

   * mechanism.  The return value will be one of

   * {@link GSSCredential#INITIATE_ONLY}, {@link GSSCredential#ACCEPT_ONLY},

   * or {@link GSSCredential#INITIATE_AND_ACCEPT}.

   *

   * @param mechOID The mechanism for which information should be returned.

   * @return The credential usage flag.

   * @throws GSSException If this operation fails.

   */

  int getUsage(Oid mechOID) throws GSSException;

  /**

   * Returns an array of mechanisms supported by this credential.

   *

   * @return The supported mechanism.

   * @throws GSSException If this operation fails.

   */

  Oid[] getMechs() throws GSSException;

  /**

   * <p>Adds a mechanism specific credential-element to an existing

   * credential.  This method allows the construction of credentials one

   * mechanism at a time.</p>

   *

   * <p>This routine is envisioned to be used mainly by context acceptors

   * during the creation of acceptance credentials which are to be used

   * with a variety of clients using different security mechanisms.</p>

   *

   * <p>This routine adds the new credential element "in-place".  To add the

   * element in a new credential, first call {@link Cloneable#clone()} to

   * obtain a copy of this credential, then call its <code>add()</code>

   * method.</p>

   *

   * @param aName          Name of the principal for whom this credential

   *                       is to be acquired. Use <code>null</code> to

   *                       specify the default principal.

   * @param initLifetime   The number of seconds that credentials should

   *                       remain valid for initiating of security contexts.

   *                       Use {@link #INDEFINITE_LIFETIME} to request that

   *                       the credentials have the maximum permitted lifetime.

   *                       Use {@link GSSCredential#DEFAULT_LIFETIME} to

   *                       request the default credential lifetime.

   * @param acceptLifetime The number of seconds that credentials should

   *                       remain valid for accepting of security contexts.

   *                       Use {@link GSSCredential#INDEFINITE_LIFETIME} to

   *                       request that the credentials have the maximum

   *                       permitted lifetime. Use {@link

   *                       GSSCredential#DEFAULT_LIFETIME} to request

   *                       the default credential lifetime.

   * @param mech           The mechanisms over which the credential is to be

   *                       acquired.

   * @param usage          The intended usage for this credential object. The

   *                       value of this parameter must be one of:

   *                       {@link GSSCredential#ACCEPT_AND_INITIATE},

   *                       {@link GSSCredential#ACCEPT_ONLY},

   *                       {@link GSSCredential#INITIATE_ONLY}.

   * @throws GSSException If this operation fails.

   */

  void add(GSSName aName, int initLifetime, int acceptLifetime,

           Oid mech, int usage) throws GSSException;

  /**

   * Tests if this GSSCredential refers to the same entity as the supplied

   * object.  The two credentials must be acquired over the same

   * mechanisms and must refer to the same principal. Returns <code>true</code>

   * if the two GSSCredentials refer to the same entity; <code>false</code>

   * otherwise. (Note that the Java language specification requires that two

   * objects that are equal according to the {@link

   * Object#equals(java.lang.Object)} method must return the same integer

   * result when the {@link Object#hashCode()} method is called on them.)

   *

   * @param another Another GSSCredential object for comparison.

   * @return True if this object equals the other.

   */

  boolean equals(Object another);

  /**

   * Return the hash code of this credential. When overriding {@link #equals},

   * it is necessary to override hashCode() as well.

   *

   * @return the hash code that must be the same for two credentials if

   * {@link #equals} returns true.

   */

  int hashCode();

}