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crypto/tls: rotate session ticket keys

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Automatically rotate session ticket keys for servers
that don't already have sessionTicketKeys and that
haven't called SetSessionTicketKeys.

Now, session ticket keys will be rotated every 24 hours
with a lifetime of 7 days. This adds a small performance
cost to existing clients that don't provide a session
ticket encrypted with a fresh enough session ticket key,
which would require a full handshake.

Updates #25256

Change-Id: I15b46af7a82aab9a108bceb706bbf66243a1510f
Reviewed-on: https://go-review.googlesource.com/c/go/+/230679
Run-TryBot: Katie Hockman <katie@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Filippo Valsorda <filippo@golang.org>
This commit is contained in:
Katie Hockman 2020-04-28 17:47:27 -04:00
parent 451074ba19
commit 47355c49eb
6 changed files with 180 additions and 99 deletions
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5
conn.go
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@ -62,6 +62,11 @@ type Conn struct {
// NewSessionTicket messages. nil if config.SessionTicketsDisabled.
resumptionSecret []byte
// ticketKeys is the set of active session ticket keys for this
// connection. The first one is used to encrypt new tickets and
// all are tried to decrypt tickets.
ticketKeys []ticketKey
// clientFinishedIsFirst is true if the client sent the first Finished
// message during the most recent handshake. This is recorded because
// the first transmitted Finished message is the tls-unique