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package caddytls
import (
"bytes"
"crypto/tls"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"strings"
"github.com/caddyserver/caddy"
)
func init() {
caddy.RegisterModule(caddy.Module{
Name: "tls.certificates.load_folders",
New: func() interface{} { return folderLoader{} },
})
}
// folderLoader loads certificates and their associated keys from disk
// by recursively walking the specified directories, looking for PEM
// files which contain both a certificate and a key.
type folderLoader []string
// LoadCertificates loads all the certificates+keys in the directories
// listed in fl from all files ending with .pem. This method of loading
// certificates expects the certificate and key to be bundled into the
// same file.
func (fl folderLoader) LoadCertificates() ([]tls.Certificate, error) {
var certs []tls.Certificate
for _, dir := range fl {
err := filepath.Walk(dir, func(fpath string, info os.FileInfo, err error) error {
if err != nil {
return fmt.Errorf("unable to traverse into path: %s", fpath)
}
if info.IsDir() {
return nil
}
if !strings.HasSuffix(strings.ToLower(info.Name()), ".pem") {
return nil
}
cert, err := x509CertFromCertAndKeyPEMFile(fpath)
if err != nil {
return err
}
certs = append(certs, cert)
return nil
})
if err != nil {
return nil, err
}
}
return certs, nil
}
func x509CertFromCertAndKeyPEMFile(fpath string) (tls.Certificate, error) {
bundle, err := ioutil.ReadFile(fpath)
if err != nil {
return tls.Certificate{}, err
}
certBuilder, keyBuilder := new(bytes.Buffer), new(bytes.Buffer)
var foundKey bool // use only the first key in the file
for {
// Decode next block so we can see what type it is
var derBlock *pem.Block
derBlock, bundle = pem.Decode(bundle)
if derBlock == nil {
break
}
if derBlock.Type == "CERTIFICATE" {
// Re-encode certificate as PEM, appending to certificate chain
pem.Encode(certBuilder, derBlock)
} else if derBlock.Type == "EC PARAMETERS" {
// EC keys generated from openssl can be composed of two blocks:
// parameters and key (parameter block should come first)
if !foundKey {
// Encode parameters
pem.Encode(keyBuilder, derBlock)
// Key must immediately follow
derBlock, bundle = pem.Decode(bundle)
if derBlock == nil || derBlock.Type != "EC PRIVATE KEY" {
return tls.Certificate{}, fmt.Errorf("%s: expected elliptic private key to immediately follow EC parameters", fpath)
}
pem.Encode(keyBuilder, derBlock)
foundKey = true
}
} else if derBlock.Type == "PRIVATE KEY" || strings.HasSuffix(derBlock.Type, " PRIVATE KEY") {
// RSA key
if !foundKey {
pem.Encode(keyBuilder, derBlock)
foundKey = true
}
} else {
return tls.Certificate{}, fmt.Errorf("%s: unrecognized PEM block type: %s", fpath, derBlock.Type)
}
}
certPEMBytes, keyPEMBytes := certBuilder.Bytes(), keyBuilder.Bytes()
if len(certPEMBytes) == 0 {
return tls.Certificate{}, fmt.Errorf("%s: failed to parse PEM data", fpath)
}
if len(keyPEMBytes) == 0 {
return tls.Certificate{}, fmt.Errorf("%s: no private key block found", fpath)
}
cert, err := tls.X509KeyPair(certPEMBytes, keyPEMBytes)
if err != nil {
return tls.Certificate{}, fmt.Errorf("%s: making X509 key pair: %v", fpath, err)
}
return cert, nil
}
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