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client.go
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client.go
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package letsencrypt
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"path"
"strings"
"time"
"github.com/Sirupsen/logrus"
lego "github.com/xenolf/lego/acme"
)
const (
ConfigDir = "/etc/letsencrypt"
ProductionApiUri = "https://acme-v01.api.letsencrypt.org/directory"
StagingApiUri = "https://acme-staging.api.letsencrypt.org/directory"
)
type KeyType string
const (
RSA2048 KeyType = "RSA-2048"
RSA4096 KeyType = "RSA-4096"
RSA8192 KeyType = "RSA-8192"
EC256 KeyType = "ECDSA-256"
EC384 KeyType = "ECDSA-384"
)
type ApiVersion string
const (
Production ApiVersion = "Production"
Sandbox ApiVersion = "Sandbox"
)
// AcmeCertificate represents a CA issued certificate,
// PrivateKey and Certificate are both PEM encoded.
//
// Anonymous fields:
// PrivateKey []byte
// Certificate []byte
// Domain string
type AcmeCertificate struct {
lego.CertificateResource
ExpiryDate time.Time `json:"expiryDate"`
SerialNumber string `json:"serialnumber"`
}
// Client represents a Lets Encrypt client
type Client struct {
client *lego.Client
apiVersion ApiVersion
}
// NewClient returns a new Lets Encrypt client
func NewClient(email string, kt KeyType, apiVer ApiVersion, provider ProviderOpts) (*Client, error) {
var keyType lego.KeyType
switch kt {
case RSA2048:
keyType = lego.RSA2048
case RSA4096:
keyType = lego.RSA4096
case RSA8192:
keyType = lego.RSA8192
case EC256:
keyType = lego.EC256
case EC384:
keyType = lego.EC384
default:
return nil, fmt.Errorf("Invalid private key type: %s", string(kt))
}
var serverUri string
switch apiVer {
case Production:
serverUri = ProductionApiUri
case Sandbox:
serverUri = StagingApiUri
default:
return nil, fmt.Errorf("Invalid LE API version: %s", string(apiVer))
}
acc, err := NewAccount(email, apiVer, keyType)
if err != nil {
return nil, fmt.Errorf("Could not initialize account store for %s: %v", email, err)
}
client, err := lego.NewClient(serverUri, acc, keyType)
if err != nil {
return nil, fmt.Errorf("Could not create client: %v", err)
}
lego.Logger = log.New(ioutil.Discard, "", 0)
if acc.Registration == nil {
logrus.Infof("Creating Let's Encrypt account for %s", email)
reg, err := client.Register()
if err != nil {
return nil, fmt.Errorf("Failed to register account: %v", err)
}
acc.Registration = reg
if acc.Registration.Body.Agreement == "" {
err = client.AgreeToTOS()
if err != nil {
return nil, fmt.Errorf("Could not agree to TOS: %v", err)
}
}
err = acc.Save()
if err != nil {
logrus.Errorf("Could not save account data: %v", err)
}
} else {
logrus.Infof("Using locally stored Let's Encrypt account for %s", email)
}
prov, err := getProvider(provider)
if err != nil {
return nil, fmt.Errorf("Could not set DNS provider: %v", err)
}
err = client.SetChallengeProvider(lego.DNS01, prov)
if err != nil {
return nil, fmt.Errorf("Could not set DNS provider: %v", err)
}
client.ExcludeChallenges([]lego.Challenge{lego.HTTP01, lego.TLSSNI01})
return &Client{
client: client,
apiVersion: apiVer,
}, nil
}
// EnableDebugLogging enables logging in the upstream lego library
func (c *Client) EnableDebug() {
lego.Logger = log.New(os.Stdout, "", 0)
}
// Issue obtains a new SAN certificate from the Lets Encrypt CA
func (c *Client) Issue(domains []string) (*AcmeCertificate, map[string]error) {
cert, failures := c.client.ObtainCertificate(domains, true, nil)
if len(failures) > 0 {
return nil, failures
}
expirydate, _ := lego.GetPEMCertExpiration(cert.Certificate)
serialnum, _ := getPEMCertSerialNo(cert.Certificate)
acmeCert := AcmeCertificate{
CertificateResource: cert,
ExpiryDate: expirydate,
SerialNumber: serialnum,
}
c.saveCertificate(acmeCert)
return &acmeCert, nil
}
// Renew obtains a renewed SAN certificate from the Lets Encrypt CA
func (c *Client) Renew(domains []string) (*AcmeCertificate, error) {
domain := domains[0]
currentCert, err := c.loadCertificate(domain)
if err != nil {
logrus.Fatalf(err.Error())
}
certRes := currentCert.CertificateResource
newCert, err := c.client.RenewCertificate(certRes, true)
if err != nil {
return nil, err
}
expirydate, _ := lego.GetPEMCertExpiration(newCert.Certificate)
serialnum, _ := getPEMCertSerialNo(newCert.Certificate)
acmeCert := AcmeCertificate{
CertificateResource: newCert,
ExpiryDate: expirydate,
SerialNumber: serialnum,
}
c.saveCertificate(acmeCert)
return &acmeCert, nil
}
// GetStoredCertificate returns a locally stored certificate for the given domains
func (c *Client) GetStoredCertificate(domains []string) (bool, *AcmeCertificate) {
domain := domains[0]
if !c.haveCertificate(domain) {
return false, nil
}
acmeCert, err := c.loadCertificate(domain)
if err != nil {
// Don't fail here. Try to create a new certificate instead.
logrus.Error(err.Error())
return false, nil
}
return true, &acmeCert
}
func (c *Client) haveCertificate(domain string) bool {
certPath := c.CertPath(domain)
if _, err := os.Stat(path.Join(certPath, "metadata.json")); err != nil {
logrus.Debugf("No existing acme certificate resource found for '%s'", domain)
return false
}
return true
}
func (c *Client) loadCertificate(domain string) (AcmeCertificate, error) {
var acmeCert AcmeCertificate
certPath := c.CertPath(domain)
logrus.Debugf("Loading acme certificate resource for '%s' from '%s'", domain, certPath)
certIn := path.Join(certPath, "fullchain.pem")
privIn := path.Join(certPath, "privkey.pem")
metaIn := path.Join(certPath, "metadata.json")
certBytes, err := ioutil.ReadFile(certIn)
if err != nil {
return acmeCert, fmt.Errorf("Failed to load certificate for domain '%s': %s", domain, err.Error())
}
metaBytes, err := ioutil.ReadFile(metaIn)
if err != nil {
return acmeCert, fmt.Errorf("Failed to load meta data for domain '%s': %s", domain, err.Error())
}
keyBytes, err := ioutil.ReadFile(privIn)
if err != nil {
return acmeCert, fmt.Errorf("Failed to load private key for domain '%s': %s", domain, err.Error())
}
err = json.Unmarshal(metaBytes, &acmeCert)
if err != nil {
return acmeCert, fmt.Errorf("Failed to unmarshal meta data for domain '%s': %s", domain, err.Error())
}
acmeCert.PrivateKey = keyBytes
acmeCert.Certificate = certBytes
return acmeCert, nil
}
func (c *Client) saveCertificate(acmeCert AcmeCertificate) {
certPath := c.CertPath(acmeCert.Domain)
maybeCreatePath(certPath)
logrus.Debugf("Saving acme certificate resource for '%s' to '%s'", acmeCert.Domain, certPath)
certOut := path.Join(certPath, "fullchain.pem")
privOut := path.Join(certPath, "privkey.pem")
metaOut := path.Join(certPath, "metadata.json")
err := ioutil.WriteFile(certOut, acmeCert.Certificate, 0600)
if err != nil {
logrus.Fatalf("Failed to save certificate for domain %s\n\t%s", acmeCert.Domain, err.Error())
}
err = ioutil.WriteFile(privOut, acmeCert.PrivateKey, 0600)
if err != nil {
logrus.Fatalf("Failed to save private key for domain %s\n\t%s", acmeCert.Domain, err.Error())
}
jsonBytes, err := json.MarshalIndent(acmeCert, "", "\t")
if err != nil {
logrus.Fatalf("Failed to marshal meta data for domain %s\n\t%s", acmeCert.Domain, err.Error())
}
err = ioutil.WriteFile(metaOut, jsonBytes, 0600)
if err != nil {
logrus.Fatalf("Failed to save meta data for domain %s\n\t%s", acmeCert.Domain, err.Error())
}
}
func (c *Client) ConfigPath() string {
path := path.Join(ConfigDir, strings.ToLower(string(c.apiVersion)))
maybeCreatePath(path)
return path
}
func (c *Client) CertPath(domain string) string {
return path.Join(c.ConfigPath(), "certificates", domain)
}
func maybeCreatePath(path string) {
if _, err := os.Stat(path); os.IsNotExist(err) {
err = os.MkdirAll(path, 0700)
if err != nil {
logrus.Fatalf("Error creating path: %v", err)
}
}
}