You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
358 lines
11 KiB
358 lines
11 KiB
// Copyright 2015 Matthew Holt
|
|
//
|
|
// 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 certmagic
|
|
|
|
import (
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/ed25519"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/sha256"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"encoding/json"
|
|
"encoding/pem"
|
|
"fmt"
|
|
"hash/fnv"
|
|
"sort"
|
|
"strings"
|
|
|
|
"github.com/klauspost/cpuid/v2"
|
|
"go.uber.org/zap"
|
|
"golang.org/x/net/idna"
|
|
)
|
|
|
|
// encodePrivateKey marshals a EC or RSA private key into a PEM-encoded array of bytes.
|
|
func encodePrivateKey(key crypto.PrivateKey) ([]byte, error) {
|
|
var pemType string
|
|
var keyBytes []byte
|
|
switch key := key.(type) {
|
|
case *ecdsa.PrivateKey:
|
|
var err error
|
|
pemType = "EC"
|
|
keyBytes, err = x509.MarshalECPrivateKey(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
case *rsa.PrivateKey:
|
|
pemType = "RSA"
|
|
keyBytes = x509.MarshalPKCS1PrivateKey(key)
|
|
case ed25519.PrivateKey:
|
|
var err error
|
|
pemType = "ED25519"
|
|
keyBytes, err = x509.MarshalPKCS8PrivateKey(key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
default:
|
|
return nil, fmt.Errorf("unsupported key type: %T", key)
|
|
}
|
|
pemKey := pem.Block{Type: pemType + " PRIVATE KEY", Bytes: keyBytes}
|
|
return pem.EncodeToMemory(&pemKey), nil
|
|
}
|
|
|
|
// decodePrivateKey loads a PEM-encoded ECC/RSA private key from an array of bytes.
|
|
// Borrowed from Go standard library, to handle various private key and PEM block types.
|
|
// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L291-L308
|
|
// https://github.com/golang/go/blob/693748e9fa385f1e2c3b91ca9acbb6c0ad2d133d/src/crypto/tls/tls.go#L238)
|
|
func decodePrivateKey(keyPEMBytes []byte) (crypto.Signer, error) {
|
|
keyBlockDER, _ := pem.Decode(keyPEMBytes)
|
|
|
|
if keyBlockDER.Type != "PRIVATE KEY" && !strings.HasSuffix(keyBlockDER.Type, " PRIVATE KEY") {
|
|
return nil, fmt.Errorf("unknown PEM header %q", keyBlockDER.Type)
|
|
}
|
|
|
|
if key, err := x509.ParsePKCS1PrivateKey(keyBlockDER.Bytes); err == nil {
|
|
return key, nil
|
|
}
|
|
|
|
if key, err := x509.ParsePKCS8PrivateKey(keyBlockDER.Bytes); err == nil {
|
|
switch key := key.(type) {
|
|
case *rsa.PrivateKey, *ecdsa.PrivateKey, ed25519.PrivateKey:
|
|
return key.(crypto.Signer), nil
|
|
default:
|
|
return nil, fmt.Errorf("found unknown private key type in PKCS#8 wrapping: %T", key)
|
|
}
|
|
}
|
|
|
|
if key, err := x509.ParseECPrivateKey(keyBlockDER.Bytes); err == nil {
|
|
return key, nil
|
|
}
|
|
|
|
return nil, fmt.Errorf("unknown private key type")
|
|
}
|
|
|
|
// parseCertsFromPEMBundle parses a certificate bundle from top to bottom and returns
|
|
// a slice of x509 certificates. This function will error if no certificates are found.
|
|
func parseCertsFromPEMBundle(bundle []byte) ([]*x509.Certificate, error) {
|
|
var certificates []*x509.Certificate
|
|
var certDERBlock *pem.Block
|
|
for {
|
|
certDERBlock, bundle = pem.Decode(bundle)
|
|
if certDERBlock == nil {
|
|
break
|
|
}
|
|
if certDERBlock.Type == "CERTIFICATE" {
|
|
cert, err := x509.ParseCertificate(certDERBlock.Bytes)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
certificates = append(certificates, cert)
|
|
}
|
|
}
|
|
if len(certificates) == 0 {
|
|
return nil, fmt.Errorf("no certificates found in bundle")
|
|
}
|
|
return certificates, nil
|
|
}
|
|
|
|
// fastHash hashes input using a hashing algorithm that
|
|
// is fast, and returns the hash as a hex-encoded string.
|
|
// Do not use this for cryptographic purposes.
|
|
func fastHash(input []byte) string {
|
|
h := fnv.New32a()
|
|
h.Write(input)
|
|
return fmt.Sprintf("%x", h.Sum32())
|
|
}
|
|
|
|
// saveCertResource saves the certificate resource to disk. This
|
|
// includes the certificate file itself, the private key, and the
|
|
// metadata file.
|
|
func (cfg *Config) saveCertResource(issuer Issuer, cert CertificateResource) error {
|
|
metaBytes, err := json.MarshalIndent(cert, "", "\t")
|
|
if err != nil {
|
|
return fmt.Errorf("encoding certificate metadata: %v", err)
|
|
}
|
|
|
|
issuerKey := issuer.IssuerKey()
|
|
certKey := cert.NamesKey()
|
|
|
|
all := []keyValue{
|
|
{
|
|
key: StorageKeys.SiteCert(issuerKey, certKey),
|
|
value: cert.CertificatePEM,
|
|
},
|
|
{
|
|
key: StorageKeys.SitePrivateKey(issuerKey, certKey),
|
|
value: cert.PrivateKeyPEM,
|
|
},
|
|
{
|
|
key: StorageKeys.SiteMeta(issuerKey, certKey),
|
|
value: metaBytes,
|
|
},
|
|
}
|
|
|
|
return storeTx(cfg.Storage, all)
|
|
}
|
|
|
|
// loadCertResourceAnyIssuer loads and returns the certificate resource from any
|
|
// of the configured issuers. If multiple are found (e.g. if there are 3 issuers
|
|
// configured, and all 3 have a resource matching certNamesKey), then the newest
|
|
// (latest NotBefore date) resource will be chosen.
|
|
func (cfg *Config) loadCertResourceAnyIssuer(certNamesKey string) (CertificateResource, error) {
|
|
// we can save some extra decoding steps if there's only one issuer, since
|
|
// we don't need to compare potentially multiple available resources to
|
|
// select the best one, when there's only one choice anyway
|
|
if len(cfg.Issuers) == 1 {
|
|
return cfg.loadCertResource(cfg.Issuers[0], certNamesKey)
|
|
}
|
|
|
|
type decodedCertResource struct {
|
|
CertificateResource
|
|
issuer Issuer
|
|
decoded *x509.Certificate
|
|
}
|
|
var certResources []decodedCertResource
|
|
var lastErr error
|
|
|
|
// load and decode all certificate resources found with the
|
|
// configured issuers so we can sort by newest
|
|
for _, issuer := range cfg.Issuers {
|
|
certRes, err := cfg.loadCertResource(issuer, certNamesKey)
|
|
if err != nil {
|
|
if _, ok := err.(ErrNotExist); ok {
|
|
// not a problem, but we need to remember the error
|
|
// in case we end up not finding any cert resources
|
|
// since we'll need an error to return in that case
|
|
lastErr = err
|
|
continue
|
|
}
|
|
return CertificateResource{}, err
|
|
}
|
|
certs, err := parseCertsFromPEMBundle(certRes.CertificatePEM)
|
|
if err != nil {
|
|
return CertificateResource{}, err
|
|
}
|
|
certResources = append(certResources, decodedCertResource{
|
|
CertificateResource: certRes,
|
|
issuer: issuer,
|
|
decoded: certs[0],
|
|
})
|
|
}
|
|
if len(certResources) == 0 {
|
|
if lastErr == nil {
|
|
lastErr = fmt.Errorf("no certificate resources found") // just in case; e.g. no Issuers configured
|
|
}
|
|
return CertificateResource{}, lastErr
|
|
}
|
|
|
|
// sort by date so the most recently issued comes first
|
|
sort.Slice(certResources, func(i, j int) bool {
|
|
return certResources[j].decoded.NotBefore.Before(certResources[i].decoded.NotBefore)
|
|
})
|
|
|
|
if cfg.Logger != nil {
|
|
cfg.Logger.Debug("loading managed certificate",
|
|
zap.String("domain", certNamesKey),
|
|
zap.Time("expiration", certResources[0].decoded.NotAfter),
|
|
zap.String("issuer_key", certResources[0].issuer.IssuerKey()),
|
|
zap.Any("storage", cfg.Storage),
|
|
)
|
|
}
|
|
|
|
return certResources[0].CertificateResource, nil
|
|
}
|
|
|
|
// loadCertResource loads a certificate resource from the given issuer's storage location.
|
|
func (cfg *Config) loadCertResource(issuer Issuer, certNamesKey string) (CertificateResource, error) {
|
|
var certRes CertificateResource
|
|
issuerKey := issuer.IssuerKey()
|
|
|
|
normalizedName, err := idna.ToASCII(certNamesKey)
|
|
if err != nil {
|
|
return certRes, fmt.Errorf("converting '%s' to ASCII: %v", certNamesKey, err)
|
|
}
|
|
|
|
certBytes, err := cfg.Storage.Load(StorageKeys.SiteCert(issuerKey, normalizedName))
|
|
if err != nil {
|
|
return CertificateResource{}, err
|
|
}
|
|
certRes.CertificatePEM = certBytes
|
|
keyBytes, err := cfg.Storage.Load(StorageKeys.SitePrivateKey(issuerKey, normalizedName))
|
|
if err != nil {
|
|
return CertificateResource{}, err
|
|
}
|
|
certRes.PrivateKeyPEM = keyBytes
|
|
metaBytes, err := cfg.Storage.Load(StorageKeys.SiteMeta(issuerKey, normalizedName))
|
|
if err != nil {
|
|
return CertificateResource{}, err
|
|
}
|
|
err = json.Unmarshal(metaBytes, &certRes)
|
|
if err != nil {
|
|
return CertificateResource{}, fmt.Errorf("decoding certificate metadata: %v", err)
|
|
}
|
|
|
|
return certRes, nil
|
|
}
|
|
|
|
// hashCertificateChain computes the unique hash of certChain,
|
|
// which is the chain of DER-encoded bytes. It returns the
|
|
// hex encoding of the hash.
|
|
func hashCertificateChain(certChain [][]byte) string {
|
|
h := sha256.New()
|
|
for _, certInChain := range certChain {
|
|
h.Write(certInChain)
|
|
}
|
|
return fmt.Sprintf("%x", h.Sum(nil))
|
|
}
|
|
|
|
func namesFromCSR(csr *x509.CertificateRequest) []string {
|
|
var nameSet []string
|
|
nameSet = append(nameSet, csr.DNSNames...)
|
|
nameSet = append(nameSet, csr.EmailAddresses...)
|
|
for _, v := range csr.IPAddresses {
|
|
nameSet = append(nameSet, v.String())
|
|
}
|
|
for _, v := range csr.URIs {
|
|
nameSet = append(nameSet, v.String())
|
|
}
|
|
return nameSet
|
|
}
|
|
|
|
// preferredDefaultCipherSuites returns an appropriate
|
|
// cipher suite to use depending on hardware support
|
|
// for AES-NI.
|
|
//
|
|
// See https://github.com/mholt/caddy/issues/1674
|
|
func preferredDefaultCipherSuites() []uint16 {
|
|
if cpuid.CPU.Supports(cpuid.AESNI) {
|
|
return defaultCiphersPreferAES
|
|
}
|
|
return defaultCiphersPreferChaCha
|
|
}
|
|
|
|
var (
|
|
defaultCiphersPreferAES = []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,
|
|
}
|
|
defaultCiphersPreferChaCha = []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,
|
|
}
|
|
)
|
|
|
|
// StandardKeyGenerator is the standard, in-memory key source
|
|
// that uses crypto/rand.
|
|
type StandardKeyGenerator struct {
|
|
// The type of keys to generate.
|
|
KeyType KeyType
|
|
}
|
|
|
|
// GenerateKey generates a new private key according to kg.KeyType.
|
|
func (kg StandardKeyGenerator) GenerateKey() (crypto.PrivateKey, error) {
|
|
switch kg.KeyType {
|
|
case ED25519:
|
|
_, priv, err := ed25519.GenerateKey(rand.Reader)
|
|
return priv, err
|
|
case "", P256:
|
|
return ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
|
|
case P384:
|
|
return ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
|
|
case RSA2048:
|
|
return rsa.GenerateKey(rand.Reader, 2048)
|
|
case RSA4096:
|
|
return rsa.GenerateKey(rand.Reader, 4096)
|
|
case RSA8192:
|
|
return rsa.GenerateKey(rand.Reader, 8192)
|
|
}
|
|
return nil, fmt.Errorf("unrecognized or unsupported key type: %s", kg.KeyType)
|
|
}
|
|
|
|
// DefaultKeyGenerator is the default key source.
|
|
var DefaultKeyGenerator = StandardKeyGenerator{KeyType: P256}
|
|
|
|
// KeyType enumerates the known/supported key types.
|
|
type KeyType string
|
|
|
|
// Constants for all key types we support.
|
|
const (
|
|
ED25519 = KeyType("ed25519")
|
|
P256 = KeyType("p256")
|
|
P384 = KeyType("p384")
|
|
RSA2048 = KeyType("rsa2048")
|
|
RSA4096 = KeyType("rsa4096")
|
|
RSA8192 = KeyType("rsa8192")
|
|
)
|
|
|