4e47a4aef7
A new attack on CBC padding in SSLv3 was released yesterday[1]. Go only supports SSLv3 as a server, not as a client. An easy fix is to change the default minimum version to TLS 1.0 but that seems a little much this late in the 1.4 process as it may break some things. Thus this patch adds server support for TLS_FALLBACK_SCSV[2] -- a mechanism for solving the fallback problem overall. Chrome has implemented this since February and Google has urged others to do so in light of yesterday's news. With this change, clients can indicate that they are doing a fallback connection and Go servers will be able to correctly reject them. [1] http://googleonlinesecurity.blogspot.com/2014/10/this-poodle-bites-exploiting-ssl-30.html [2] https://tools.ietf.org/html/draft-ietf-tls-downgrade-scsv-00 LGTM=rsc R=rsc CC=golang-codereviews https://golang.org/cl/157090043
80 lines
2.6 KiB
Go
80 lines
2.6 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package tls
|
|
|
|
import "strconv"
|
|
|
|
type alert uint8
|
|
|
|
const (
|
|
// alert level
|
|
alertLevelWarning = 1
|
|
alertLevelError = 2
|
|
)
|
|
|
|
const (
|
|
alertCloseNotify alert = 0
|
|
alertUnexpectedMessage alert = 10
|
|
alertBadRecordMAC alert = 20
|
|
alertDecryptionFailed alert = 21
|
|
alertRecordOverflow alert = 22
|
|
alertDecompressionFailure alert = 30
|
|
alertHandshakeFailure alert = 40
|
|
alertBadCertificate alert = 42
|
|
alertUnsupportedCertificate alert = 43
|
|
alertCertificateRevoked alert = 44
|
|
alertCertificateExpired alert = 45
|
|
alertCertificateUnknown alert = 46
|
|
alertIllegalParameter alert = 47
|
|
alertUnknownCA alert = 48
|
|
alertAccessDenied alert = 49
|
|
alertDecodeError alert = 50
|
|
alertDecryptError alert = 51
|
|
alertProtocolVersion alert = 70
|
|
alertInsufficientSecurity alert = 71
|
|
alertInternalError alert = 80
|
|
alertInappropriateFallback alert = 86
|
|
alertUserCanceled alert = 90
|
|
alertNoRenegotiation alert = 100
|
|
)
|
|
|
|
var alertText = map[alert]string{
|
|
alertCloseNotify: "close notify",
|
|
alertUnexpectedMessage: "unexpected message",
|
|
alertBadRecordMAC: "bad record MAC",
|
|
alertDecryptionFailed: "decryption failed",
|
|
alertRecordOverflow: "record overflow",
|
|
alertDecompressionFailure: "decompression failure",
|
|
alertHandshakeFailure: "handshake failure",
|
|
alertBadCertificate: "bad certificate",
|
|
alertUnsupportedCertificate: "unsupported certificate",
|
|
alertCertificateRevoked: "revoked certificate",
|
|
alertCertificateExpired: "expired certificate",
|
|
alertCertificateUnknown: "unknown certificate",
|
|
alertIllegalParameter: "illegal parameter",
|
|
alertUnknownCA: "unknown certificate authority",
|
|
alertAccessDenied: "access denied",
|
|
alertDecodeError: "error decoding message",
|
|
alertDecryptError: "error decrypting message",
|
|
alertProtocolVersion: "protocol version not supported",
|
|
alertInsufficientSecurity: "insufficient security level",
|
|
alertInternalError: "internal error",
|
|
alertInappropriateFallback: "inappropriate fallback",
|
|
alertUserCanceled: "user canceled",
|
|
alertNoRenegotiation: "no renegotiation",
|
|
}
|
|
|
|
func (e alert) String() string {
|
|
s, ok := alertText[e]
|
|
if ok {
|
|
return s
|
|
}
|
|
return "alert(" + strconv.Itoa(int(e)) + ")"
|
|
}
|
|
|
|
func (e alert) Error() string {
|
|
return e.String()
|
|
}
|