Make CLIENT_RENEG_LIMIT inclusive instead of exclusive, i.e. a limit of 2
means the peer can renegotiate twice, not just once.
Update pummel/test-tls-ci-reneg-attack accordingly and make it less timing
sensitive (and run faster) while we're at it.
The TLS protocol allows (and sometimes requires) clients to renegotiate the
session. However, renegotiation requires a disproportional amount of server-side
resources, particularly CPU time, which makes it a potential vector for
denial-of-service attacks.
To mitigate this issue, we keep track of and limit the number of renegotiation
requests over time, emitting an error if the threshold is exceeded.
Ben Noordhuis
isaacs