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package sun.security.jgss.spi;
import org.ietf.jgss.*;
import java.security.Provider;
/**
* This interface is implemented by the factory class for every
* plugin mechanism. The GSSManager locates an implementation of this
* interface by querying the security providers installed on the
* system. For a provider to support a mechanism defined by Oid x.y.z,
* the provider master file would have to contain a mapping from the
* property "GssApiMechanism.x.y.z" to an implementation class that serves
* as the factory for that mechanism.
* <p>
* e.g., If a provider master file contained the a mapping from the
* property "GssApiMechanism.1.2.840.113554.1.2.2" to the class name
* "com.foo.krb5.Krb5GssFactory", then the GSS-API framework would assume
* that com.foo.krb5.Krb5GssFactory implements the MechanismFactory
* interface and that it can be used to obtain elements required by for
* supporting this mechanism.
*
* @author Mayank Upadhyay
*/
public interface MechanismFactory {
/**
* Returns the Oid of the mechanism that this factory supports.
* @return the Oid
*/
public Oid getMechanismOid();
/**
* Returns the provider that this factory came from.
* @return the provider
*/
public Provider getProvider();
/**
* Returns the GSS-API nametypes that this mechanism can
* support. Having this method helps the GSS-Framework decide quickly
* if a certain mechanism can be skipped when importing a name.
* @return an array of the Oid's corresponding to the different GSS-API
* nametypes supported
* @see org.ietf.jgss.GSSName
*/
public Oid[] getNameTypes() throws GSSException;
/**
* Creates a credential element for this mechanism to be included as
* part of a GSSCredential implementation. A GSSCredential is
* conceptually a container class of several credential elements from
* different mechanisms. A GSS-API credential can be used either for
* initiating GSS security contexts or for accepting them. This method
* also accepts parameters that indicate what usage is expected and how
* long the life of the credential should be. It is not necessary that
* the mechanism honor the request for lifetime. An application will
* always query an acquired GSSCredential to determine what lifetime it
* got back.<p>
*
* <b>Not all mechanisms support the concept of one credential element
* that can be used for both initiating and accepting a context. In the
* event that an application requests usage INITIATE_AND_ACCEPT for a
* credential from such a mechanism, the GSS framework will need to
* obtain two different credential elements from the mechanism, one
* that will have usage INITIATE_ONLY and another that will have usage
* ACCEPT_ONLY. The mechanism will help the GSS-API realize this by
* returning a credential element with usage INITIATE_ONLY or
* ACCEPT_ONLY prompting it to make another call to
* getCredentialElement, this time with the other usage mode. The
* mechanism indicates the missing mode by returning a 0 lifetime for
* it.</b>
*
* @param name the mechanism level name element for the entity whose
* credential is desired. A null value indicates that a mechanism
* dependent default choice is to be made.
* @param initLifetime indicates the lifetime (in seconds) that is
* requested for this credential to be used at the context initiator's
* end. This value should be ignored if the usage is
* ACCEPT_ONLY. Predefined contants are available in the
* org.ietf.jgss.GSSCredential interface.
* @param acceptLifetime indicates the lifetime (in seconds) that is
* requested for this credential to be used at the context acceptor's
* end. This value should be ignored if the usage is
* INITIATE_ONLY. Predefined contants are available in the
* org.ietf.jgss.GSSCredential interface.
* @param usage One of the values GSSCredential.INIATE_ONLY,
* GSSCredential.ACCEPT_ONLY, and GSSCredential.INITIATE_AND_ACCEPT.
* @see org.ietf.jgss.GSSCredential
* @throws GSSException if one of the error situations described in RFC
* 2743 with the GSS_Acquire_Cred or GSS_Add_Cred calls occurs.
*/
public GSSCredentialSpi getCredentialElement(GSSNameSpi name,
int initLifetime, int acceptLifetime, int usage) throws GSSException;
/**
* Creates a name element for this mechanism to be included as part of
* a GSSName implementation. A GSSName is conceptually a container
* class of several name elements from different mechanisms. A GSSName
* can be created either with a String or with a sequence of
* bytes. This factory method accepts the name in a String. Such a name
* can generally be assumed to be printable and may be returned from
* the name element's toString() method.
*
* @param nameStr a string containing the characters describing this
* entity to the mechanism
* @param nameType an Oid serving as a clue as to how the mechanism should
* interpret the nameStr
* @throws GSSException if any of the errors described in RFC 2743 for
* the GSS_Import_Name or GSS_Canonicalize_Name calls occur.
*/
public GSSNameSpi getNameElement(String nameStr, Oid nameType)
throws GSSException;
/**
* This is a variation of the factory method that accepts a String for
* the characters that make up the name. Usually the String characters
* are assumed to be printable. The bytes passed in to this method have
* to be converted to characters using some encoding of the mechanism's
* choice. It is recommended that UTF-8 be used. (Note that UTF-8
* preserves the encoding for 7-bit ASCII characters.)
* <p>
* An exported name will generally be passed in using this method.
*
* @param nameBytes the bytes describing this entity to the mechanism
* @param nameType an Oid serving as a clue as to how the mechanism should
* interpret the nameStr
* @throws GSSException if any of the errors described in RFC 2743 for
* the GSS_Import_Name or GSS_Canonicalize_Name calls occur.
*/
public GSSNameSpi getNameElement(byte[] name, Oid nameType)
throws GSSException;
/**
* Creates a security context for this mechanism so that it can be used
* on the context initiator's side.
*
* @param peer the name element from this mechanism that represents the
* peer
* @param myInitiatorCred a credential element for the context
* initiator obtained previously from this mechanism. The identity of
* the context initiator can be obtained from this credential. Passing
* a value of null here indicates that a default entity of the
* mechanism's choice should be assumed to be the context initiator and
* that default credentials should be applied.
* @param lifetime the requested lifetime (in seconds) for the security
* context. Predefined contants are available in the
* org.ietf.jgss.GSSContext interface.
* @throws GSSException if any of the errors described in RFC 2743 in
* the GSS_Init_Sec_Context call occur.
*/
public GSSContextSpi getMechanismContext(GSSNameSpi peer,
GSSCredentialSpi myInitiatorCred,
int lifetime) throws GSSException;
/**
* Creates a security context for this mechanism so thatit can be used
* on the context acceptor's side.
*
* @param myAcceptorCred a credential element for the context acceptor
* obtained previously from this mechanism. The identity of the context
* acceptor cna be obtained from this credential. Passing a value of
* null here indicates that tha default entity of the mechanism's
* choice should be assumed to be the context acceptor and default
* credentials should be applied.
*
* @throws GSSException if any of the errors described in RFC 2743 in
* the GSS_Accept_Sec_Context call occur.
*/
public GSSContextSpi getMechanismContext(GSSCredentialSpi myAcceptorCred)
throws GSSException;
/**
* Creates a security context from a previously exported (serialized)
* security context. Note that this is different from Java
* serialization and is defined at a mechanism level to interoperate
* over the wire with non-Java implementations. Either the initiator or
* the acceptor can export and then import a security context.
* Implementations of mechanism contexts are not required to implement
* exporting and importing.
*
* @param exportedContext the bytes representing this security context
* @throws GSSException is any of the errors described in RFC 2743 in
* the GSS_Import_Sec_Context call occur.
*/
public GSSContextSpi getMechanismContext(byte[] exportedContext)
throws GSSException;
}