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package javax.net.ssl;

import java.security.Principal;


In SSL, sessions are used to describe an ongoing relationship between
two entities.  Each SSL connection involves one session at a time, but
that session may be used on many connections between those entities,
simultaneously or sequentially.  The session used on a connection may
also be replaced by a different session.  Sessions are created, or
rejoined, as part of the SSL handshaking protocol. Sessions may be
invalidated due to policies affecting security or resource usage,
or by an application explicitly calling invalidate.
Session management policies are typically used to tune performance.

 In addition to the standard session attributes, SSL sessions expose
these read-only attributes:  
    
     
  •  Peer Identity.  Sessions are between a particular
     client and a particular server.  The identity of the peer may
     have been established as part of session setup.  Peers are
     generally identified by X.509 certificate chains.
     
  •  Cipher Suite Name.  Cipher suites describe the
     kind of cryptographic protection that's used by connections
     in a particular session.
     
  •  Peer Host.  All connections in a session are
     between the same two hosts.  The address of the host on the other
     side of the connection is available.
     


 Sessions may be explicitly invalidated.  Invalidation may also
be done implicitly, when faced with certain kinds of errors.

Author:David Brownell
Since:1.4
/**
 * In SSL, sessions are used to describe an ongoing relationship between
 * two entities.  Each SSL connection involves one session at a time, but
 * that session may be used on many connections between those entities,
 * simultaneously or sequentially.  The session used on a connection may
 * also be replaced by a different session.  Sessions are created, or
 * rejoined, as part of the SSL handshaking protocol. Sessions may be
 * invalidated due to policies affecting security or resource usage,
 * or by an application explicitly calling <code>invalidate</code>.
 * Session management policies are typically used to tune performance.
 *
 * <P> In addition to the standard session attributes, SSL sessions expose
 * these read-only attributes:  <UL>
 *
 *      <LI> <em>Peer Identity.</em>  Sessions are between a particular
 *      client and a particular server.  The identity of the peer may
 *      have been established as part of session setup.  Peers are
 *      generally identified by X.509 certificate chains.
 *
 *      <LI> <em>Cipher Suite Name.</em>  Cipher suites describe the
 *      kind of cryptographic protection that's used by connections
 *      in a particular session.
 *
 *      <LI> <em>Peer Host.</em>  All connections in a session are
 *      between the same two hosts.  The address of the host on the other
 *      side of the connection is available.
 *
 *      </UL>
 *
 * <P> Sessions may be explicitly invalidated.  Invalidation may also
 * be done implicitly, when faced with certain kinds of errors.
 *
 * @since 1.4
 * @author David Brownell
 */
public interface SSLSession {

    
Returns the identifier assigned to this Session.

Returns:the Session identifier
/**
     * Returns the identifier assigned to this Session.
     *
     * @return the Session identifier
     */
    public byte[] getId();


    
Returns the context in which this session is bound.


This context may be unavailable in some environments,
in which case this method returns null.


If the context is available and there is a
security manager installed, the caller may require
permission to access it or a security exception may be thrown.
In a Java environment, the security manager's
checkPermission method is called with a
SSLPermission("getSSLSessionContext") permission.

Throws:
  • SecurityException – if the calling thread does not have
        permission to get SSL session context.
Returns:the session context used for this session, or null
if the context is unavailable.
/**
     * Returns the context in which this session is bound.
     * <P>
     * This context may be unavailable in some environments,
     * in which case this method returns null.
     * <P>
     * If the context is available and there is a
     * security manager installed, the caller may require
     * permission to access it or a security exception may be thrown.
     * In a Java environment, the security manager's
     * <code>checkPermission</code> method is called with a
     * <code>SSLPermission("getSSLSessionContext")</code> permission.
     *
     * @throws SecurityException if the calling thread does not have
     *         permission to get SSL session context.
     * @return the session context used for this session, or null
     * if the context is unavailable.
     */
    public SSLSessionContext getSessionContext();


    
Returns the time at which this Session representation was created,
in milliseconds since midnight, January 1, 1970 UTC.

Returns:the time this Session was created
/**
     * Returns the time at which this Session representation was created,
     * in milliseconds since midnight, January 1, 1970 UTC.
     *
     * @return the time this Session was created
     */
    public long getCreationTime();


    
Returns the last time this Session representation was accessed by the
session level infrastructure, in milliseconds since
midnight, January 1, 1970 UTC.


Access indicates a new connection being established using session data.
Application level operations, such as getting or setting a value
associated with the session, are not reflected in this access time.

 This information is particularly useful in session management
policies.  For example, a session manager thread could leave all
sessions in a given context which haven't been used in a long time;
or, the sessions might be sorted according to age to optimize some task.

Returns:the last time this Session was accessed
/**
     * Returns the last time this Session representation was accessed by the
     * session level infrastructure, in milliseconds since
     * midnight, January 1, 1970 UTC.
     * <P>
     * Access indicates a new connection being established using session data.
     * Application level operations, such as getting or setting a value
     * associated with the session, are not reflected in this access time.
     *
     * <P> This information is particularly useful in session management
     * policies.  For example, a session manager thread could leave all
     * sessions in a given context which haven't been used in a long time;
     * or, the sessions might be sorted according to age to optimize some task.
     *
     * @return the last time this Session was accessed
     */
    public long getLastAccessedTime();


    
Invalidates the session.


Future connections will not be able to
resume or join this session.  However, any existing connection
using this session can continue to use the session until the
connection is closed.

See Also:
  • isValid()
/**
     * Invalidates the session.
     * <P>
     * Future connections will not be able to
     * resume or join this session.  However, any existing connection
     * using this session can continue to use the session until the
     * connection is closed.
     *
     * @see #isValid()
     */
    public void invalidate();


    
Returns whether this session is valid and available for resuming or
joining.

See Also:
Returns:true if this session may be rejoined.
Since:1.5
/**
     * Returns whether this session is valid and available for resuming or
     * joining.
     *
     * @return true if this session may be rejoined.
     * @see #invalidate()
     *
     * @since 1.5
     */
    public boolean isValid();


    
Binds the specified value object into the
session's application layer data
with the given name.


Any existing binding using the same name is
replaced.  If the new (or existing) value implements the
SSLSessionBindingListener interface, the object
represented by value is notified appropriately.


For security reasons, the same named values may not be
visible across different access control contexts.

Params:
  • name – the name to which the data object will be bound.
         This may not be null.
  • value – the data object to be bound. This may not be null.
Throws:
/**
     *
     * Binds the specified <code>value</code> object into the
     * session's application layer data
     * with the given <code>name</code>.
     * <P>
     * Any existing binding using the same <code>name</code> is
     * replaced.  If the new (or existing) <code>value</code> implements the
     * <code>SSLSessionBindingListener</code> interface, the object
     * represented by <code>value</code> is notified appropriately.
     * <p>
     * For security reasons, the same named values may not be
     * visible across different access control contexts.
     *
     * @param name the name to which the data object will be bound.
     *          This may not be null.
     * @param value the data object to be bound. This may not be null.
     * @throws IllegalArgumentException if either argument is null.
     */
    public void putValue(String name, Object value);


    
Returns the object bound to the given name in the session's
application layer data.  Returns null if there is no such binding.


For security reasons, the same named values may not be
visible across different access control contexts.

Params:
  • name – the name of the binding to find.
Throws:
Returns:the value bound to that name, or null if the binding does
         not exist.
/**
     * Returns the object bound to the given name in the session's
     * application layer data.  Returns null if there is no such binding.
     * <p>
     * For security reasons, the same named values may not be
     * visible across different access control contexts.
     *
     * @param name the name of the binding to find.
     * @return the value bound to that name, or null if the binding does
     *          not exist.
     * @throws IllegalArgumentException if the argument is null.
     */
    public Object getValue(String name);


    
Removes the object bound to the given name in the session's
application layer data.  Does nothing if there is no object
bound to the given name.  If the bound existing object
implements the SessionBindingListener interface,
it is notified appropriately.


For security reasons, the same named values may not be
visible across different access control contexts.

Params:
  • name – the name of the object to remove visible
         across different access control contexts
Throws:
/**
     * Removes the object bound to the given name in the session's
     * application layer data.  Does nothing if there is no object
     * bound to the given name.  If the bound existing object
     * implements the <code>SessionBindingListener</code> interface,
     * it is notified appropriately.
     * <p>
     * For security reasons, the same named values may not be
     * visible across different access control contexts.
     *
     * @param name the name of the object to remove visible
     *          across different access control contexts
     * @throws IllegalArgumentException if the argument is null.
     */
    public void removeValue(String name);


    
Returns an array of the names of all the application layer
data objects bound into the Session.


For security reasons, the same named values may not be
visible across different access control contexts.

Returns:a non-null (possibly empty) array of names of the objects
 bound to this Session.
/**
     * Returns an array of the names of all the application layer
     * data objects bound into the Session.
     * <p>
     * For security reasons, the same named values may not be
     * visible across different access control contexts.
     *
     * @return a non-null (possibly empty) array of names of the objects
     *  bound to this Session.
     */
    public String [] getValueNames();

    
Returns the identity of the peer which was established as part
of defining the session.


Note: This method can be used only when using certificate-based
cipher suites; using it with non-certificate-based cipher suites,
such as Kerberos, will throw an SSLPeerUnverifiedException.

Throws:
See Also:
Returns:an ordered array of peer certificates,
         with the peer's own certificate first followed by any
         certificate authorities.
/**
     * Returns the identity of the peer which was established as part
     * of defining the session.
     * <P>
     * Note: This method can be used only when using certificate-based
     * cipher suites; using it with non-certificate-based cipher suites,
     * such as Kerberos, will throw an SSLPeerUnverifiedException.
     *
     * @return an ordered array of peer certificates,
     *          with the peer's own certificate first followed by any
     *          certificate authorities.
     * @exception SSLPeerUnverifiedException if the peer's identity has not
     *          been verified
     * @see #getPeerPrincipal()
     */
    public java.security.cert.Certificate [] getPeerCertificates()
            throws SSLPeerUnverifiedException;

    
Returns the certificate(s) that were sent to the peer during
handshaking.


Note: This method is useful only when using certificate-based
cipher suites.


When multiple certificates are available for use in a
handshake, the implementation chooses what it considers the
"best" certificate chain available, and transmits that to
the other side.  This method allows the caller to know
which certificate chain was actually used.

See Also:
Returns:an ordered array of certificates,
with the local certificate first followed by any
certificate authorities.  If no certificates were sent,
then null is returned.
/**
     * Returns the certificate(s) that were sent to the peer during
     * handshaking.
     * <P>
     * Note: This method is useful only when using certificate-based
     * cipher suites.
     * <P>
     * When multiple certificates are available for use in a
     * handshake, the implementation chooses what it considers the
     * "best" certificate chain available, and transmits that to
     * the other side.  This method allows the caller to know
     * which certificate chain was actually used.
     *
     * @return an ordered array of certificates,
     * with the local certificate first followed by any
     * certificate authorities.  If no certificates were sent,
     * then null is returned.
     *
     * @see #getLocalPrincipal()
     */
    public java.security.cert.Certificate [] getLocalCertificates();

    
Returns the identity of the peer which was identified as part
of defining the session.


Note: This method can be used only when using certificate-based
cipher suites; using it with non-certificate-based cipher suites,
such as Kerberos, will throw an SSLPeerUnverifiedException.

Note: this method exists for compatibility with previous releases. New applications should use getPeerCertificates instead.


Throws:
See Also:
Returns:an ordered array of peer X.509 certificates, with the peer's own certificate first followed by any certificate authorities. (The certificates are in the original JSSE certificate X509Certificate format.)
/**
     * Returns the identity of the peer which was identified as part
     * of defining the session.
     * <P>
     * Note: This method can be used only when using certificate-based
     * cipher suites; using it with non-certificate-based cipher suites,
     * such as Kerberos, will throw an SSLPeerUnverifiedException.
     *
     * <p><em>Note: this method exists for compatibility with previous
     * releases. New applications should use
     * {@link #getPeerCertificates} instead.</em></p>
     *
     * @return an ordered array of peer X.509 certificates,
     *          with the peer's own certificate first followed by any
     *          certificate authorities.  (The certificates are in
     *          the original JSSE certificate
     *          {@link javax.security.cert.X509Certificate} format.)
     * @exception SSLPeerUnverifiedException if the peer's identity
     *          has not been verified
     * @see #getPeerPrincipal()
     */
    public javax.security.cert.X509Certificate [] getPeerCertificateChain()
            throws SSLPeerUnverifiedException;

    
Returns the identity of the peer which was established as part of
defining the session.

Throws:
See Also:
Returns:the peer's principal. Returns an X500Principal of the
end-entity certiticate for X509-based cipher suites, and
KerberosPrincipal for Kerberos cipher suites.
Since:1.5
/**
     * Returns the identity of the peer which was established as part of
     * defining the session.
     *
     * @return the peer's principal. Returns an X500Principal of the
     * end-entity certiticate for X509-based cipher suites, and
     * KerberosPrincipal for Kerberos cipher suites.
     *
     * @throws SSLPeerUnverifiedException if the peer's identity has not
     *          been verified
     *
     * @see #getPeerCertificates()
     * @see #getLocalPrincipal()
     *
     * @since 1.5
     */
    public Principal getPeerPrincipal()
            throws SSLPeerUnverifiedException;

    
Returns the principal that was sent to the peer during handshaking.

See Also:
Returns:the principal sent to the peer. Returns an X500Principal
of the end-entity certificate for X509-based cipher suites, and
KerberosPrincipal for Kerberos cipher suites. If no principal was
sent, then null is returned.
Since:1.5
/**
     * Returns the principal that was sent to the peer during handshaking.
     *
     * @return the principal sent to the peer. Returns an X500Principal
     * of the end-entity certificate for X509-based cipher suites, and
     * KerberosPrincipal for Kerberos cipher suites. If no principal was
     * sent, then null is returned.
     *
     * @see #getLocalCertificates()
     * @see #getPeerPrincipal()
     *
     * @since 1.5
     */
    public Principal getLocalPrincipal();

    
Returns the name of the SSL cipher suite which is used for all
connections in the session.

 This defines the level of protection
provided to the data sent on the connection, including the kind
of encryption used and most aspects of how authentication is done.

Returns:the name of the session's cipher suite
/**
     * Returns the name of the SSL cipher suite which is used for all
     * connections in the session.
     *
     * <P> This defines the level of protection
     * provided to the data sent on the connection, including the kind
     * of encryption used and most aspects of how authentication is done.
     *
     * @return the name of the session's cipher suite
     */
    public String getCipherSuite();

    
Returns the standard name of the protocol used for all
connections in the session.

 This defines the protocol used in the connection.

Returns:the standard name of the protocol used for all
connections in the session.
/**
     * Returns the standard name of the protocol used for all
     * connections in the session.
     *
     * <P> This defines the protocol used in the connection.
     *
     * @return the standard name of the protocol used for all
     * connections in the session.
     */
    public String getProtocol();

    
Returns the host name of the peer in this session.


For the server, this is the client's host;  and for
the client, it is the server's host. The name may not be
a fully qualified host name or even a host name at all as
it may represent a string encoding of the peer's network address.
If such a name is desired, it might
be resolved through a name service based on the value returned
by this method.


This value is not authenticated and should not be relied upon.
It is mainly used as a hint for SSLSession caching
strategies.

Returns: the host name of the peer host, or null if no information
         is available.
/**
     * Returns the host name of the peer in this session.
     * <P>
     * For the server, this is the client's host;  and for
     * the client, it is the server's host. The name may not be
     * a fully qualified host name or even a host name at all as
     * it may represent a string encoding of the peer's network address.
     * If such a name is desired, it might
     * be resolved through a name service based on the value returned
     * by this method.
     * <P>
     * This value is not authenticated and should not be relied upon.
     * It is mainly used as a hint for <code>SSLSession</code> caching
     * strategies.
     *
     * @return  the host name of the peer host, or null if no information
     *          is available.
     */
    public String getPeerHost();

    
Returns the port number of the peer in this session.


For the server, this is the client's port number;  and for
the client, it is the server's port number.


This value is not authenticated and should not be relied upon.
It is mainly used as a hint for SSLSession caching
strategies.

Returns: the port number of the peer host, or -1 if no information
         is available.
Since:1.5
/**
     * Returns the port number of the peer in this session.
     * <P>
     * For the server, this is the client's port number;  and for
     * the client, it is the server's port number.
     * <P>
     * This value is not authenticated and should not be relied upon.
     * It is mainly used as a hint for <code>SSLSession</code> caching
     * strategies.
     *
     * @return  the port number of the peer host, or -1 if no information
     *          is available.
     *
     * @since 1.5
     */
    public int getPeerPort();

    
Gets the current size of the largest SSL/TLS packet that is expected
when using this session.


A SSLEngine using this session may generate SSL/TLS
packets of any size up to and including the value returned by this
method. All SSLEngine network buffers should be sized
at least this large to avoid insufficient space problems when
performing wrap and unwrap calls.

See Also:
  • SSLEngine.wrap(ByteBuffer, ByteBuffer)
  • SSLEngine.unwrap(ByteBuffer, ByteBuffer)
Returns: the current maximum expected network packet size
Since:1.5
/**
     * Gets the current size of the largest SSL/TLS packet that is expected
     * when using this session.
     * <P>
     * A <code>SSLEngine</code> using this session may generate SSL/TLS
     * packets of any size up to and including the value returned by this
     * method. All <code>SSLEngine</code> network buffers should be sized
     * at least this large to avoid insufficient space problems when
     * performing <code>wrap</code> and <code>unwrap</code> calls.
     *
     * @return  the current maximum expected network packet size
     *
     * @see SSLEngine#wrap(ByteBuffer, ByteBuffer)
     * @see SSLEngine#unwrap(ByteBuffer, ByteBuffer)
     *
     * @since 1.5
     */
    public int getPacketBufferSize();


    
Gets the current size of the largest application data that is
expected when using this session.


SSLEngine application data buffers must be large
enough to hold the application data from any inbound network
application data packet received.  Typically, outbound
application data buffers can be of any size.

See Also:
  • SSLEngine.wrap(ByteBuffer, ByteBuffer)
  • SSLEngine.unwrap(ByteBuffer, ByteBuffer)
Returns: the current maximum expected application packet size
Since:1.5
/**
     * Gets the current size of the largest application data that is
     * expected when using this session.
     * <P>
     * <code>SSLEngine</code> application data buffers must be large
     * enough to hold the application data from any inbound network
     * application data packet received.  Typically, outbound
     * application data buffers can be of any size.
     *
     * @return  the current maximum expected application packet size
     *
     * @see SSLEngine#wrap(ByteBuffer, ByteBuffer)
     * @see SSLEngine#unwrap(ByteBuffer, ByteBuffer)
     *
     * @since 1.5
     */
    public int getApplicationBufferSize();
}