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crypto/tls: enable TLS 1.3 by default

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Updates #30055

Change-Id: I3e79dd7592673c5d76568b0bcded6c391c3be6b3
Reviewed-on: https://go-review.googlesource.com/c/163081
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Filippo Valsorda 2019-02-20 13:50:08 -05:00
parent 2e9a42ccc2
commit 5d20f2d294
3 changed files with 6 additions and 18 deletions
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8
common.go
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@ -776,7 +776,7 @@ func (c *Config) supportedVersions(isClient bool) []uint16 {
if isClient && v < VersionTLS10 {
continue
}
// TLS 1.3 is opt-in in Go 1.12.
// TLS 1.3 is opt-out in Go 1.13.
if v == VersionTLS13 && !isTLS13Supported() {
continue
}
@ -791,11 +791,11 @@ var tls13Support struct {
cached bool
}
// isTLS13Supported returns whether the program opted into TLS 1.3 via
// GODEBUG=tls13=1. It's cached after the first execution.
// isTLS13Supported returns whether the program enabled TLS 1.3 by not opting
// out with GODEBUG=tls13=0. It's cached after the first execution.
func isTLS13Supported() bool {
tls13Support.Do(func() {
tls13Support.cached = goDebugString("tls13") == "1"
tls13Support.cached = goDebugString("tls13") != "0"
})
return tls13Support.cached
}