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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 {@code 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.
 *<p>
 * This interface is not normally accessed directly by a server, which will use the
 * {@code Sasl} static methods
 * instead. However, a particular environment may provide and install a
 * new or different {@code SaslServerFactory}.
 *
 * @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 fully qualified host name of the server to authenticate to, or null if the server is not bound to any specific host name. If the mechanism does not allow an unbound server, a SaslException will be thrown.
  • 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 {@code SaslServer} using the parameters supplied.
     * It returns null
     * if no {@code SaslServer} can be created using the parameters supplied.
     * Throws {@code SaslException} if it cannot create a {@code SaslServer}
     * 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 fully qualified host name of the server to
     * authenticate to, or null if the server is not bound to any specific host
     * name. If the mechanism does not allow an unbound server, a
     * {@code SaslException} will be thrown.
     * @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 {@code 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.
     *
     * @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 {@code NameCallback}.
     * The password is requested by using a {@code PasswordCallback}.
     * The realm is requested by using a {@code RealmChoiceCallback} if there is a list
     * of realms to choose from, and by using a {@code RealmCallback} if
     * the realm must be entered.
     *
     *@return A possibly null {@code SaslServer} created using the parameters
     * supplied. If null, this factory cannot produce a {@code SaslServer}
     * using the parameters supplied.
     *@exception SaslException If cannot create a {@code SaslServer} 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 {@code props}
     * contains the {@code Sasl.POLICY_NOPLAINTEXT} property with the value
     * {@code "true"}, then the factory must not return any SASL mechanisms
     * that are susceptible to simple plain passive attacks.
     * See the {@code Sasl} class for a complete list of policy properties.
     * Non-policy related properties, if present in {@code props}, 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);
}