On Fri, 14 Jun 2024 07:46:19 GMT, Daniel Jeliński <djelin...@openjdk.org> wrote:
>> Hi >> >> This change is to improve TLS 1.3 session resumption by allowing a TLS >> server to send more than one resumption ticket per connection and clients to >> store more. Resumption is a quick way to use an existing TLS session to >> establish another session by avoiding the long TLS full handshake process. >> In TLS 1.2 and below, clients can repeatedly resume a session by using the >> session ID from an established connection. In TLS 1.3, a one-time >> "resumption ticket" is sent by the server after the TLS connection has been >> established. The server may send multiple resumption tickets to help >> clients that rapidly resume connections. If the client does not have >> another resumption ticket, it must go through the full TLS handshake again. >> The current implementation in JDK 23 and below, only sends and store one >> resumption ticket. >> >> The number of resumption tickets a server can send should be configurable by >> the application developer or administrator. [RFC >> 8446](https://www.rfc-editor.org/rfc/rfc8446) does not specify a default >> value. A system property called `jdk.tls.server.newSessionTicketCount` >> allows the user to change the number of resumption tickets sent by the >> server. If this property is not set or given an invalid value, the default >> value of 3 is used. Further details are in the CSR. >> >> A large portion of the changeset is on the client side by changing the >> caching system used by TLS. It creates a new `CacheEntry<>` type called >> `QueueCacheEntry<>` that will store multiple values for a Map entry. > > src/java.base/share/classes/sun/security/ssl/SSLConfiguration.java line 202: > >> 200: Integer nstServerCount = GetIntegerAction.privilegedGetProperty( >> 201: "jdk.tls.server.newSessionTicketCount"); >> 202: if (nstServerCount == null || nstServerCount < 1 || > > Please permit zero here. It is useful for preventing the connection reset on > connections where the client is only writing and never reading from the > socket. I have been on the fence with zero. I can support it. ------------- PR Review Comment: https://git.openjdk.org/jdk/pull/19465#discussion_r1640152857
