RELEASE NOTES: JDK 17.0.6

Change in SSLEngine.closeInbound() Behavior

The SunJSSE close notification checks for SSLEngine to have been made less strict to conform to changes in the Transport Layer Security (TLS) RFCs. See also JDK-8253368.

Specifically, if an application tries to close its SSLEngine inbound side using SSLEngine.closeInbound() without having received a close notification message from its peer, the SSLEngine will no longer:

1. trigger the transmission of a TLS fatal-level alert to the peer, and
2. invalidate the current TLS session.

The new behavior will still consider this condition an error and will throw a local javax.net.ssl.SSLException. But a fatal-level alert will no longer be generated to be sent to the peer, and the underlying session will remain valid.

In addition, the internal transport context for the SSLEngine will also now be closed. This may result in a different SSLEngineResult.HandshakeStatus value on the SSLEngine. Any outstanding outbound data must still be obtained (SSLEngine.wrap()) and sent in order to gracefully close the connection.

New Implementation Note for LoginModule on Removing Null from a Principals or Credentials Set

The Set implementation that holds principals and credentials in a JAAS Subject prohibits null elements and any attempt to add, query, or remove a null element will result in a NullPointerException. This is especially important when trying to remove principals or credentials from the subject at the logout phase but they are null because of a previous failed login. Various JDK LoginModule implementations have been fixed to avoid the exception. An Implementation Note has also been added to the logout() method of the LoginModule interface. Developers should verify, and if necessary update, any custom LoginModule implementations to be compliant with this implementation advice.