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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
others, and derivative works that comment on or otherwise explain it
or assist in its implementation may be prepared, copied, published and
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provided that the above copyright notice and this paragraph are
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document itself may not be modified in any way, such as by removing
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The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.
 
This document and the information contained herein is provided on an
"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT
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();
 
}