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crypto/tls: check client's supported versions when using QUIC

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According to RFC 9001 Section 4.2, the client MUST NOT offer any TLS version
older than 1.3.

Fixes #63723.

Change-Id: Ia92f98274ca784e2bc151faf236380af51f699c1
Reviewed-on: https://go-review.googlesource.com/c/go/+/537576
Reviewed-by: Filippo Valsorda <filippo@golang.org>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Damien Neil <dneil@google.com>
This commit is contained in:
Marten Seemann 2023-10-25 11:04:24 +07:00 • committed by Gopher Robot
parent 2dbfad5cbe
commit f20bc39fcb
1 changed files with 8 additions and 1 deletions
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9
handshake_server_tls13.go
View file

@ -240,8 +240,15 @@ GroupSelection:
c.clientProtocol = selectedProto
if c.quic != nil {
// RFC 9001 Section 4.2: Clients MUST NOT offer TLS versions older than 1.3.
for _, v := range hs.clientHello.supportedVersions {
if v < VersionTLS13 {
c.sendAlert(alertProtocolVersion)
return errors.New("tls: client offered TLS version older than TLS 1.3")
}
}
// RFC 9001 Section 8.2.
if hs.clientHello.quicTransportParameters == nil {
// RFC 9001 Section 8.2.
c.sendAlert(alertMissingExtension)
return errors.New("tls: client did not send a quic_transport_parameters extension")
}