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crypto/tls: implement TLS 1.3 client handshake (base)

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Implement a basic TLS 1.3 client handshake, only enabled if explicitly
requested with MaxVersion.

This CL intentionally leaves for future CLs:
  - PSK modes and resumption
  - client authentication
  - post-handshake messages
  - downgrade protection
  - KeyLogWriter support

Updates #9671

Change-Id: Ieb6130fb6f25aea4f0d39e3a2448dfc942e1de7a
Reviewed-on: https://go-review.googlesource.com/c/146559
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 2018-11-01 01:01:09 -04:00
parent ed74f7823e
commit 2c3ff7ba06
25 changed files with 2074 additions and 362 deletions
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6
handshake_messages.go
View file

@ -466,7 +466,8 @@ func (m *clientHelloMsg) unmarshal(data []byte) bool {
}
case extensionCookie:
// RFC 8446, Section 4.2.2
if !readUint16LengthPrefixed(&extData, &m.cookie) {
if !readUint16LengthPrefixed(&extData, &m.cookie) ||
len(m.cookie) == 0 {
return false
}
case extensionKeyShare:
@ -757,7 +758,8 @@ func (m *serverHelloMsg) unmarshal(data []byte) bool {
return false
}
case extensionCookie:
if !readUint16LengthPrefixed(&extData, &m.cookie) {
if !readUint16LengthPrefixed(&extData, &m.cookie) ||
len(m.cookie) == 0 {
return false
}
case extensionKeyShare: