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crypto/tls: enable TLS_FALLBACK_SCSV in server with default max version

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Fix TLS_FALLBACK_SCSV check when comparing the client version to the
default max version. This enables the TLS_FALLBACK_SCSV check by default
in servers that do not explicitly set a max version in the tls config.

Change-Id: I5a51f9da6d71b79bc6c2ba45032be51d0f704b5e
Reviewed-on: https://go-review.googlesource.com/1776
Reviewed-by: Adam Langley <agl@golang.org>
This commit is contained in:
Ben Burkert 2014-12-18 10:17:54 -08:00 • committed by Adam Langley
parent a367222d8d
commit c7825f0a55
2 changed files with 6 additions and 2 deletions
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2
handshake_server.go
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@ -228,7 +228,7 @@ Curves:
for _, id := range hs.clientHello.cipherSuites { for _, id := range hs.clientHello.cipherSuites {
if id == TLS_FALLBACK_SCSV { if id == TLS_FALLBACK_SCSV {
// The client is doing a fallback connection. // The client is doing a fallback connection.
if hs.clientHello.vers < c.config.MaxVersion { if hs.clientHello.vers < c.config.maxVersion() {
c.sendAlert(alertInappropriateFallback) c.sendAlert(alertInappropriateFallback)
return false, errors.New("tls: client using inppropriate protocol fallback") return false, errors.New("tls: client using inppropriate protocol fallback")
} }

6
handshake_server_test.go
View file

@ -716,8 +716,12 @@ func TestResumptionDisabled(t *testing.T) {
} }
func TestFallbackSCSV(t *testing.T) { func TestFallbackSCSV(t *testing.T) {
serverConfig := &Config{
Certificates: testConfig.Certificates,
}
test := &serverTest{ test := &serverTest{
name: "FallbackSCSV", name: "FallbackSCSV",
config: serverConfig,
// OpenSSL 1.0.1j is needed for the -fallback_scsv option. // OpenSSL 1.0.1j is needed for the -fallback_scsv option.
command: []string{"openssl", "s_client", "-fallback_scsv"}, command: []string{"openssl", "s_client", "-fallback_scsv"},
expectHandshakeErrorIncluding: "inppropriate protocol fallback", expectHandshakeErrorIncluding: "inppropriate protocol fallback",