This is done by running the key exchange and setting the session ID
under mutex. If the first exchange encounters an already set session
ID, then do nothing.
This fixes a race condition:
On setting up the connection, both sides sent a kexInit to initiate
the first (mandatory) key exchange. If one side was faster, the
faster side might have completed the key exchange, before the slow
side had a chance to send a kexInit. The slow side would send a
kexInit which would trigger a second key exchange. The resulting
confirmation message (msgNewKeys) would confuse the authentication
loop.
This fix removes sessionID from the transport struct.
This fix also deletes the unused interface rekeyingTransport.
Fixes#15066
Change-Id: I7f303bce5d3214c9bdd58f52d21178a185871d90
Reviewed-on: https://go-review.googlesource.com/21606
Reviewed-by: Adam Langley <agl@golang.org>
Reviewed-by: Han-Wen Nienhuys <hanwen@google.com>
Unblock writers if a read error occurs while writers are blocked on a
pending key change.
Add test to check for deadlocks in error paths in handshake.go
Fixesgolang/go#11992.
Change-Id: Id098bd9fec3d4fe83daeb2b7f935e5647c19afd3
Reviewed-on: https://go-review.googlesource.com/13594
Reviewed-by: Adam Langley <agl@golang.org>
Han-Wen Nienhuys
David du Colombier
Adam Langley