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crypto/tls: let HTTP/1.1 clients connect to servers with NextProtos "h2"

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Fixes #46310

Change-Id: Idd5e30f05c439f736ae6f3904cbb9cc2ba772315
Reviewed-on: https://go-review.googlesource.com/c/go/+/325432
Trust: Filippo Valsorda <filippo@golang.org>
Run-TryBot: Filippo Valsorda <filippo@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
This commit is contained in:
Filippo Valsorda 2021-06-07 08:24:22 -04:00
parent 27f83723e9
commit dc00dc6c6b
7 changed files with 277 additions and 50 deletions
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14
src/crypto/tls/handshake_client_tls13.go
View file

@ -396,17 +396,11 @@ func (hs *clientHandshakeStateTLS13) readServerParameters() error {
}
hs.transcript.Write(encryptedExtensions.marshal())
if encryptedExtensions.alpnProtocol != "" {
if len(hs.hello.alpnProtocols) == 0 {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server advertised unrequested ALPN extension")
}
if mutualProtocol([]string{encryptedExtensions.alpnProtocol}, hs.hello.alpnProtocols) == "" {
c.sendAlert(alertUnsupportedExtension)
return errors.New("tls: server selected unadvertised ALPN protocol")
}
c.clientProtocol = encryptedExtensions.alpnProtocol
if err := checkALPN(hs.hello.alpnProtocols, encryptedExtensions.alpnProtocol); err != nil {
c.sendAlert(alertUnsupportedExtension)
return err
}
c.clientProtocol = encryptedExtensions.alpnProtocol
return nil
}