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package javax.security.sasl;

import java.util.Map;
import javax.security.auth.callback.CallbackHandler;


An interface for creating instances of SaslServer.
A class that implements this interface
must be thread-safe and handle multiple simultaneous
requests. It must also have a public constructor that accepts no
argument.


This interface is not normally accessed directly by a server, which will use the
Sasl static methods
instead. However, a particular environment may provide and install a
new or different SaslServerFactory.

Author:Rosanna Lee, Rob Weltman
See Also:
Since:1.5
/**
 * An interface for creating instances of <tt>SaslServer</tt>.
 * A class that implements this interface
 * must be thread-safe and handle multiple simultaneous
 * requests. It must also have a public constructor that accepts no
 * argument.
 *<p>
 * This interface is not normally accessed directly by a server, which will use the
 * <tt>Sasl</tt> static methods
 * instead. However, a particular environment may provide and install a
 * new or different <tt>SaslServerFactory</tt>.
 *
 * @since 1.5
 *
 * @see SaslServer
 * @see Sasl
 *
 * @author Rosanna Lee
 * @author Rob Weltman
 */
public abstract interface SaslServerFactory {
    
Creates a SaslServer using the parameters supplied.
It returns null
if no SaslServer can be created using the parameters supplied.
Throws SaslException if it cannot create a SaslServer
because of an error.

Params:
  • mechanism – The non-null
IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
  • protocol – The non-null string name of the protocol for which
the authentication is being performed (e.g., "ldap").
  • serverName – The non-null fully qualified host name of the server
to authenticate to.
  • props – The possibly null set of properties used to select the SASL
mechanism and to configure the authentication exchange of the selected
mechanism. See the Sasl class for a list of standard properties.
Other, possibly mechanism-specific, properties can be included.
Properties not relevant to the selected mechanism are ignored,
including any map entries with non-String keys.
  • cbh – The possibly null callback handler to used by the SASL
mechanisms to get further information from the application/library
to complete the authentication. For example, a SASL mechanism might
require the authentication ID, password and realm from the caller.
The authentication ID is requested by using a NameCallback.
The password is requested by using a PasswordCallback.
The realm is requested by using a RealmChoiceCallback if there is a list
of realms to choose from, and by using a RealmCallback if
the realm must be entered.
Throws:
  • SaslException – If cannot create a SaslServer because
of an error.
Returns:A possibly null SaslServer created using the parameters
supplied. If null, this factory cannot produce a SaslServer
using the parameters supplied.
/**
     * Creates a <tt>SaslServer</tt> using the parameters supplied.
     * It returns null
     * if no <tt>SaslServer</tt> can be created using the parameters supplied.
     * Throws <tt>SaslException</tt> if it cannot create a <tt>SaslServer</tt>
     * because of an error.
     *
     * @param mechanism The non-null
     * IANA-registered name of a SASL mechanism. (e.g. "GSSAPI", "CRAM-MD5").
     * @param protocol The non-null string name of the protocol for which
     * the authentication is being performed (e.g., "ldap").
     * @param serverName The non-null fully qualified host name of the server
     * to authenticate to.
     * @param props The possibly null set of properties used to select the SASL
     * mechanism and to configure the authentication exchange of the selected
     * mechanism. See the <tt>Sasl</tt> class for a list of standard properties.
     * Other, possibly mechanism-specific, properties can be included.
     * Properties not relevant to the selected mechanism are ignored,
     * including any map entries with non-String keys.
     *
     * @param cbh The possibly null callback handler to used by the SASL
     * mechanisms to get further information from the application/library
     * to complete the authentication. For example, a SASL mechanism might
     * require the authentication ID, password and realm from the caller.
     * The authentication ID is requested by using a <tt>NameCallback</tt>.
     * The password is requested by using a <tt>PasswordCallback</tt>.
     * The realm is requested by using a <tt>RealmChoiceCallback</tt> if there is a list
     * of realms to choose from, and by using a <tt>RealmCallback</tt> if
     * the realm must be entered.
     *
     *@return A possibly null <tt>SaslServer</tt> created using the parameters
     * supplied. If null, this factory cannot produce a <tt>SaslServer</tt>
     * using the parameters supplied.
     *@exception SaslException If cannot create a <tt>SaslServer</tt> because
     * of an error.
     */
    public abstract SaslServer createSaslServer(
        String mechanism,
        String protocol,
        String serverName,
        Map<String,?> props,
        CallbackHandler cbh) throws SaslException;

    
Returns an array of names of mechanisms that match the specified
mechanism selection policies.

Params:
  • props – The possibly null set of properties used to specify the
security policy of the SASL mechanisms. For example, if props
contains the Sasl.POLICY_NOPLAINTEXT property with the value
"true", then the factory must not return any SASL mechanisms
that are susceptible to simple plain passive attacks.
See the Sasl class for a complete list of policy properties.
Non-policy related properties, if present in props, are ignored,
including any map entries with non-String keys.
Returns:A non-null array containing a IANA-registered SASL mechanism names.
/**
     * Returns an array of names of mechanisms that match the specified
     * mechanism selection policies.
     * @param props The possibly null set of properties used to specify the
     * security policy of the SASL mechanisms. For example, if <tt>props</tt>
     * contains the <tt>Sasl.POLICY_NOPLAINTEXT</tt> property with the value
     * <tt>"true"</tt>, then the factory must not return any SASL mechanisms
     * that are susceptible to simple plain passive attacks.
     * See the <tt>Sasl</tt> class for a complete list of policy properties.
     * Non-policy related properties, if present in <tt>props</tt>, are ignored,
     * including any map entries with non-String keys.
     * @return A non-null array containing a IANA-registered SASL mechanism names.
     */
    public abstract String[] getMechanismNames(Map<String,?> props);
}