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crypto/tls: disable 3-DES by default

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Fixes #66214

Change-Id: Iba8006a17fc7cd33c7485ab1a1ef8f56531c0ed1
Reviewed-on: https://go-review.googlesource.com/c/go/+/587295
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Auto-Submit: Filippo Valsorda <filippo@golang.org>
This commit is contained in:
yuhan6665 2024-08-18 22:46:19 -04:00
parent 7daa6c8547
commit 194e345d4a
2 changed files with 18 additions and 16 deletions
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28
cipher_suites.go
View File

@ -16,6 +16,7 @@ import (
"fmt"
"hash"
"runtime"
"slices"
"golang.org/x/crypto/chacha20poly1305"
"golang.org/x/sys/cpu"
@ -345,21 +346,20 @@ var rsaKexCiphers = map[uint16]bool{
TLS_RSA_WITH_AES_256_GCM_SHA384: true,
}
var defaultCipherSuites []uint16
var defaultCipherSuitesWithRSAKex []uint16
// tdesCiphers contains 3DES ciphers,
// which we also disable by default unless a GODEBUG is set.
var tdesCiphers = map[uint16]bool{
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA: true,
TLS_RSA_WITH_3DES_EDE_CBC_SHA: true,
}
func init() {
defaultCipherSuites = make([]uint16, 0, len(cipherSuitesPreferenceOrder))
defaultCipherSuitesWithRSAKex = make([]uint16, 0, len(cipherSuitesPreferenceOrder))
for _, c := range cipherSuitesPreferenceOrder {
if disabledCipherSuites[c] {
continue
}
if !rsaKexCiphers[c] {
defaultCipherSuites = append(defaultCipherSuites, c)
}
defaultCipherSuitesWithRSAKex = append(defaultCipherSuitesWithRSAKex, c)
}
func defaultCipherSuites() []uint16 {
suites := slices.Clone(cipherSuitesPreferenceOrder)
return slices.DeleteFunc(suites, func(c uint16) bool {
return disabledCipherSuites[c] ||
rsaKexCiphers[c] ||
tdesCiphers[c]
})
}
// defaultCipherSuitesTLS13 is also the preference order, since there are no

6
common.go
View File

@ -700,7 +700,9 @@ type Config struct {
// If CipherSuites is nil, a safe default list is used. The default cipher
// suites might change over time. In Go 1.22 RSA key exchange based cipher
// suites were removed from the default list, but can be re-added with the
// GODEBUG setting tlsrsakex=1.
// GODEBUG setting tlsrsakex=1. In Go 1.23 3DES cipher suites were removed
// from the default list, but can be re-added with the GODEBUG setting
// tls3des=1.
CipherSuites []uint16
// PreferServerCipherSuites is a legacy field and has no effect.
@ -1056,7 +1058,7 @@ func (c *Config) cipherSuites() []uint16 {
if c.CipherSuites != nil {
return c.CipherSuites
}
return defaultCipherSuites
return defaultCipherSuites()
}
var supportedVersions = []uint16{