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ciphersuites.go
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ciphersuites.go
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// Copyright Project Contour Authors
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package config
import (
"fmt"
"strings"
)
// TLSCiphers holds a list of TLS ciphers
type TLSCiphers []string
// DefaultTLSCiphers contains the list of default ciphers used by Contour. A handful are
// commented out, as they're arguably less secure. They're also unnecessary
// - most of the clients that might need to use the commented ciphers are
// unable to connect without TLS 1.0, which contour never enables.
//
// This list is ignored if the client and server negotiate TLS 1.3.
//
// The commented ciphers are left in place to simplify updating this list for future
// versions of envoy.
var DefaultTLSCiphers = TLSCiphers([]string{
"[ECDHE-ECDSA-AES128-GCM-SHA256|ECDHE-ECDSA-CHACHA20-POLY1305]",
"[ECDHE-RSA-AES128-GCM-SHA256|ECDHE-RSA-CHACHA20-POLY1305]",
//"ECDHE-ECDSA-AES128-SHA",
//"ECDHE-RSA-AES128-SHA",
//"AES128-GCM-SHA256",
//"AES128-SHA",
"ECDHE-ECDSA-AES256-GCM-SHA384",
"ECDHE-RSA-AES256-GCM-SHA384",
//"ECDHE-ECDSA-AES256-SHA",
//"ECDHE-RSA-AES256-SHA",
//"AES256-GCM-SHA384",
//"AES256-SHA",
})
// validTLSCiphers contains the list of TLS ciphers that Envoy supports
// See: https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/transport_sockets/tls/v3/common.proto#extensions-transport-sockets-tls-v3-tlsparameters
// Note: This list is a superset of what is valid for stock Envoy builds and those using BoringSSL FIPS.
var validTLSCiphers = map[string]struct{}{
"[ECDHE-ECDSA-AES128-GCM-SHA256|ECDHE-ECDSA-CHACHA20-POLY1305]": {},
"[ECDHE-RSA-AES128-GCM-SHA256|ECDHE-RSA-CHACHA20-POLY1305]": {},
"ECDHE-ECDSA-AES128-GCM-SHA256": {},
"ECDHE-RSA-AES128-GCM-SHA256": {},
"ECDHE-ECDSA-AES128-SHA": {},
"ECDHE-RSA-AES128-SHA": {},
"AES128-GCM-SHA256": {},
"AES128-SHA": {},
"ECDHE-ECDSA-AES256-GCM-SHA384": {},
"ECDHE-RSA-AES256-GCM-SHA384": {},
"ECDHE-ECDSA-AES256-SHA": {},
"ECDHE-RSA-AES256-SHA": {},
"AES256-GCM-SHA384": {},
"AES256-SHA": {},
}
// SanitizeCipherSuites trims a list of ciphers to remove whitespace and
// duplicates, returning the passed in default if the corrected list is empty.
// The ciphers argument should be a list of valid ciphers.
func SanitizeCipherSuites(ciphers []string) []string {
if len(ciphers) == 0 {
return DefaultTLSCiphers
}
uniqueCiphers := map[string]bool{}
validatedCiphers := []string{}
for _, v := range ciphers {
cipher := strings.TrimSpace(v)
if _, found := uniqueCiphers[cipher]; !found {
uniqueCiphers[cipher] = true
validatedCiphers = append(validatedCiphers, cipher)
}
}
return validatedCiphers
}
// Validate ciphers. Returns error on unsupported cipher.
func (tlsCiphers TLSCiphers) Validate() error {
invalidCiphers := []string{}
for _, cipher := range tlsCiphers {
trimmed := strings.TrimSpace(cipher)
if _, ok := validTLSCiphers[trimmed]; !ok {
invalidCiphers = append(invalidCiphers, trimmed)
}
}
if len(invalidCiphers) > 0 {
return fmt.Errorf("invalid ciphers: %s", strings.Join(invalidCiphers, ","))
}
return nil
}