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caddytls: Support external certificate Managers (like Tailscale) (#4541)

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Huge thank-you to Tailscale (https://tailscale.com) for making this change possible!
This is a great feature for Caddy and Tailscale is a great fit for a standard implementation.

* caddytls: GetCertificate modules; Tailscale

* Caddyfile support for get_certificate

Also fix AP provisioning in case of empty subject list (persist loaded
module on struct, much like Issuers, to surive reprovisioning).

And implement start of HTTP cert getter, still WIP.

* Update modules/caddytls/automation.go

Co-authored-by: Francis Lavoie <lavofr@gmail.com>

* Use tsclient package, check status for name

* Implement HTTP cert getter

And use reuse CertMagic's PEM functions for private keys.

* Remove cache option from Tailscale getter

Tailscale does its own caching and we don't need the added complexity...
for now, at least.

* Several updates

- Option to disable cert automation in auto HTTPS
- Support multiple cert managers
- Remove cache feature from cert manager modules
- Minor improvements to auto HTTPS logging

* Run go mod tidy

* Try to get certificates from Tailscale implicitly

Only for domains ending in .ts.net.

I think this is really cool!

Co-authored-by: Francis Lavoie <lavofr@gmail.com>
This commit is contained in:
Matt Holt
2022-02-17 15:40:34 -07:00
committed by GitHub
parent 32aad90938
commit 57a708d189
13 changed files with 450 additions and 158 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
modules/caddypki/ca.go
View File

@@ -239,7 +239,7 @@ func (ca CA) loadOrGenRoot() (rootCert *x509.Certificate, rootKey interface{}, e
if err != nil {
return nil, nil, fmt.Errorf("loading root key: %v", err)
}
rootKey, err = pemDecodePrivateKey(rootKeyPEM)
rootKey, err = certmagic.PEMDecodePrivateKey(rootKeyPEM)
if err != nil {
return nil, nil, fmt.Errorf("decoding root key: %v", err)
}
@@ -263,7 +263,7 @@ func (ca CA) genRoot() (rootCert *x509.Certificate, rootKey interface{}, err err
if err != nil {
return nil, nil, fmt.Errorf("saving root certificate: %v", err)
}
rootKeyPEM, err := pemEncodePrivateKey(rootKey)
rootKeyPEM, err := certmagic.PEMEncodePrivateKey(rootKey)
if err != nil {
return nil, nil, fmt.Errorf("encoding root key: %v", err)
}
@@ -275,7 +275,7 @@ func (ca CA) genRoot() (rootCert *x509.Certificate, rootKey interface{}, err err
return rootCert, rootKey, nil
}
func (ca CA) loadOrGenIntermediate(rootCert *x509.Certificate, rootKey interface{}) (interCert *x509.Certificate, interKey interface{}, err error) {
func (ca CA) loadOrGenIntermediate(rootCert *x509.Certificate, rootKey crypto.PrivateKey) (interCert *x509.Certificate, interKey crypto.PrivateKey, err error) {
interCertPEM, err := ca.storage.Load(ca.storageKeyIntermediateCert())
if err != nil {
if _, ok := err.(certmagic.ErrNotExist); !ok {
@@ -301,7 +301,7 @@ func (ca CA) loadOrGenIntermediate(rootCert *x509.Certificate, rootKey interface
if err != nil {
return nil, nil, fmt.Errorf("loading intermediate key: %v", err)
}
interKey, err = pemDecodePrivateKey(interKeyPEM)
interKey, err = certmagic.PEMDecodePrivateKey(interKeyPEM)
if err != nil {
return nil, nil, fmt.Errorf("decoding intermediate key: %v", err)
}
@@ -310,7 +310,7 @@ func (ca CA) loadOrGenIntermediate(rootCert *x509.Certificate, rootKey interface
return interCert, interKey, nil
}
func (ca CA) genIntermediate(rootCert *x509.Certificate, rootKey interface{}) (interCert *x509.Certificate, interKey interface{}, err error) {
func (ca CA) genIntermediate(rootCert *x509.Certificate, rootKey crypto.PrivateKey) (interCert *x509.Certificate, interKey crypto.PrivateKey, err error) {
repl := ca.newReplacer()
interCert, interKey, err = generateIntermediate(repl.ReplaceAll(ca.IntermediateCommonName, ""), rootCert, rootKey)
@@ -325,7 +325,7 @@ func (ca CA) genIntermediate(rootCert *x509.Certificate, rootKey interface{}) (i
if err != nil {
return nil, nil, fmt.Errorf("saving intermediate certificate: %v", err)
}
interKeyPEM, err := pemEncodePrivateKey(interKey)
interKeyPEM, err := certmagic.PEMEncodePrivateKey(interKey)
if err != nil {
return nil, nil, fmt.Errorf("encoding intermediate key: %v", err)
}

5
modules/caddypki/certificates.go
View File

@@ -15,6 +15,7 @@
package caddypki
import (
"crypto"
"crypto/x509"
"time"
@@ -30,7 +31,7 @@ func generateRoot(commonName string) (rootCrt *x509.Certificate, privateKey inte
return newCert(rootProfile)
}
func generateIntermediate(commonName string, rootCrt *x509.Certificate, rootKey interface{}) (cert *x509.Certificate, privateKey interface{}, err error) {
func generateIntermediate(commonName string, rootCrt *x509.Certificate, rootKey crypto.PrivateKey) (cert *x509.Certificate, privateKey crypto.PrivateKey, err error) {
interProfile, err := x509util.NewIntermediateProfile(commonName, rootCrt, rootKey)
if err != nil {
return
@@ -39,7 +40,7 @@ func generateIntermediate(commonName string, rootCrt *x509.Certificate, rootKey
return newCert(interProfile)
}
func newCert(profile x509util.Profile) (cert *x509.Certificate, privateKey interface{}, err error) {
func newCert(profile x509util.Profile) (cert *x509.Certificate, privateKey crypto.PrivateKey, err error) {
certBytes, err := profile.CreateCertificate()
if err != nil {
return

74
modules/caddypki/crypto.go
View File

@@ -17,14 +17,12 @@ package caddypki
import (
"bytes"
"crypto"
"crypto/ecdsa"
"crypto/ed25519"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"fmt"
"os"
"strings"
"github.com/caddyserver/certmagic"
)
func pemDecodeSingleCert(pemDER []byte) (*x509.Certificate, error) {
@@ -45,70 +43,6 @@ func pemEncodeCert(der []byte) ([]byte, error) {
return pemEncode("CERTIFICATE", der)
}
// pemEncodePrivateKey marshals a EC or RSA private key into a PEM-encoded array of bytes.
// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
func pemEncodePrivateKey(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)
}
return pemEncode(pemType+" PRIVATE KEY", keyBytes)
}
// pemDecodePrivateKey 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)
// TODO: this is the same thing as in certmagic. Should we reuse that code somehow? It's unexported.
func pemDecodePrivateKey(keyPEMBytes []byte) (crypto.PrivateKey, error) {
keyBlockDER, _ := pem.Decode(keyPEMBytes)
if keyBlockDER == nil {
return nil, fmt.Errorf("no PEM data found")
}
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, 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")
}
func pemEncode(blockType string, b []byte) ([]byte, error) {
var buf bytes.Buffer
err := pem.Encode(&buf, &pem.Block{Type: blockType, Bytes: b})
@@ -137,7 +71,7 @@ type KeyPair struct {
}
// Load loads the certificate and key.
func (kp KeyPair) Load() (*x509.Certificate, interface{}, error) {
func (kp KeyPair) Load() (*x509.Certificate, crypto.Signer, error) {
switch kp.Format {
case "", "pem_file":
certData, err := os.ReadFile(kp.Certificate)
@@ -153,7 +87,7 @@ func (kp KeyPair) Load() (*x509.Certificate, interface{}, error) {
if err != nil {
return nil, nil, err
}
key, err := pemDecodePrivateKey(keyData)
key, err := certmagic.PEMDecodePrivateKey(keyData)
if err != nil {
return nil, nil, err
}