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// Copyright 2015 Matthew Holt and The Caddy 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 caddytls
import (
"crypto/tls"
"crypto/x509"
"fmt"
"github.com/caddyserver/certmagic"
"github.com/klauspost/cpuid/v2"
)
// CipherSuiteNameSupported returns true if name is
// a supported cipher suite.
func CipherSuiteNameSupported(name string) bool {
return CipherSuiteID(name) != 0
}
// CipherSuiteID returns the ID of the cipher suite associated with
// the given name, or 0 if the name is not recognized/supported.
func CipherSuiteID(name string) uint16 {
for _, cs := range SupportedCipherSuites() {
if cs.Name == name {
return cs.ID
}
}
return 0
}
// SupportedCipherSuites returns a list of all the cipher suites
// Caddy supports. The list is NOT ordered by security preference.
func SupportedCipherSuites() []*tls.CipherSuite {
return tls.CipherSuites()
}
// defaultCipherSuites is the ordered list of all the cipher
// suites we want to support by default, assuming AES-NI
// (hardware acceleration for AES).
var defaultCipherSuitesWithAESNI = []uint16{
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
}
// defaultCipherSuites is the ordered list of all the cipher
// suites we want to support by default, assuming lack of
// AES-NI (NO hardware acceleration for AES).
var defaultCipherSuitesWithoutAESNI = []uint16{
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
}
// getOptimalDefaultCipherSuites returns an appropriate cipher
// suite to use depending on the hardware support for AES.
//
// See https://github.com/caddyserver/caddy/issues/1674
func getOptimalDefaultCipherSuites() []uint16 {
if cpuid.CPU.Supports(cpuid.AESNI) {
return defaultCipherSuitesWithAESNI
}
return defaultCipherSuitesWithoutAESNI
}
// SupportedCurves is the unordered map of supported curves.
// https://golang.org/pkg/crypto/tls/#CurveID
var SupportedCurves = map[string]tls.CurveID{
"x25519": tls.X25519,
"secp256r1": tls.CurveP256,
"secp384r1": tls.CurveP384,
"secp521r1": tls.CurveP521,
}
// supportedCertKeyTypes is all the key types that are supported
// for certificates that are obtained through ACME.
var supportedCertKeyTypes = map[string]certmagic.KeyType{
"rsa2048": certmagic.RSA2048,
"rsa4096": certmagic.RSA4096,
"p256": certmagic.P256,
"p384": certmagic.P384,
"ed25519": certmagic.ED25519,
}
// defaultCurves is the list of only the curves we want to use
// by default, in descending order of preference.
//
// This list should only include curves which are fast by design
// (e.g. X25519) and those for which an optimized assembly
// implementation exists (e.g. P256). The latter ones can be
// found here:
// https://github.com/golang/go/tree/master/src/crypto/elliptic
var defaultCurves = []tls.CurveID{
tls.X25519,
tls.CurveP256,
}
// SupportedProtocols is a map of supported protocols.
var SupportedProtocols = map[string]uint16{
"tls1.2": tls.VersionTLS12,
"tls1.3": tls.VersionTLS13,
}
// unsupportedProtocols is a map of unsupported protocols.
// Used for logging only, not enforcement.
var unsupportedProtocols = map[string]uint16{
//nolint:staticcheck
"ssl3.0": tls.VersionSSL30,
"tls1.0": tls.VersionTLS10,
"tls1.1": tls.VersionTLS11,
}
// publicKeyAlgorithms is the map of supported public key algorithms.
var publicKeyAlgorithms = map[string]x509.PublicKeyAlgorithm{
"rsa": x509.RSA,
"dsa": x509.DSA,
"ecdsa": x509.ECDSA,
}
// ProtocolName returns the standard name for the passed protocol version ID
// (e.g. "TLS1.3") or a fallback representation of the ID value if the version
// is not supported.
func ProtocolName(id uint16) string {
for k, v := range SupportedProtocols {
if v == id {
return k
}
}
for k, v := range unsupportedProtocols {
if v == id {
return k
}
}
return fmt.Sprintf("0x%04x", id)
}
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