lego

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Published: Jan 9, 2019 License: MIT

README

lego

Let's Encrypt client and ACME library written in Go

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Installation

Binaries

To get the binary just download the latest release for your OS/Arch from the release page and put the binary somewhere convenient. lego does not assume anything about the location you run it from.

From Docker
docker run xenolf/lego -h
From package managers
yay -S lego

Note: only the package manager for Arch Linux is officially supported by the lego team.

From sources

To install from sources, just run:

go get -u github.com/xenolf/lego/cmd/lego

Features

  • Register with CA
  • Obtain certificates, both from scratch or with an existing CSR
  • Renew certificates
  • Revoke certificates
  • Robust implementation of all ACME challenges
    • HTTP (http-01)
    • DNS (dns-01)
    • TLS (tls-alpn-01)
  • SAN certificate support
  • Comes with multiple optional DNS providers
  • Custom challenge solvers
  • Certificate bundling
  • OCSP helper function

Please keep in mind that CLI switches and APIs are still subject to change.

When using the standard --path option, all certificates and account configurations are saved to a folder .lego in the current working directory.

Usage

NAME:
   lego - Let's Encrypt client written in Go

USAGE:
   lego [global options] command [command options] [arguments...]

COMMANDS:
     run      Register an account, then create and install a certificate
     revoke   Revoke a certificate
     renew    Renew a certificate
     dnshelp  Shows additional help for the --dns global option
     list     Display certificates and accounts information.
     help, h  Shows a list of commands or help for one command

GLOBAL OPTIONS:
   --domains value, -d value    Add a domain to the process. Can be specified multiple times.
   --server value, -s value     CA hostname (and optionally :port). The server certificate must be trusted in order to avoid further modifications to the client. (default: "https://acme-v02.api.letsencrypt.org/directory")
   --accept-tos, -a             By setting this flag to true you indicate that you accept the current Let's Encrypt terms of service.
   --email value, -m value      Email used for registration and recovery contact.
   --csr value, -c value        Certificate signing request filename, if an external CSR is to be used.
   --eab                        Use External Account Binding for account registration. Requires --kid and --hmac.
   --kid value                  Key identifier from External CA. Used for External Account Binding.
   --hmac value                 MAC key from External CA. Should be in Base64 URL Encoding without padding format. Used for External Account Binding.
   --key-type value, -k value   Key type to use for private keys. Supported: rsa2048, rsa4096, rsa8192, ec256, ec384. (default: "rsa2048")
   --filename value             (deprecated) Filename of the generated certificate.
   --path value                 Directory to use for storing the data. (default: "./.lego")
   --http                       Use the HTTP challenge to solve challenges. Can be mixed with other types of challenges.
   --http.port value            Set the port and interface to use for HTTP based challenges to listen on.Supported: interface:port or :port. (default: ":80")
   --http.webroot value         Set the webroot folder to use for HTTP based challenges to write directly in a file in .well-known/acme-challenge.
   --http.memcached-host value  Set the memcached host(s) to use for HTTP based challenges. Challenges will be written to all specified hosts.
   --tls                        Use the TLS challenge to solve challenges. Can be mixed with other types of challenges.
   --tls.port value             Set the port and interface to use for TLS based challenges to listen on. Supported: interface:port or :port. (default: ":443")
   --dns value                  Solve a DNS challenge using the specified provider. Can be mixed with other types of challenges. Run 'lego dnshelp' for help on usage.
   --dns.disable-cp             By setting this flag to true, disables the need to wait the propagation of the TXT record to all authoritative name servers.
   --dns.resolvers value        Set the resolvers to use for performing recursive DNS queries. Supported: host:port. The default is to use the system resolvers, or Google's DNS resolvers if the system's cannot be determined.
   --http-timeout value         Set the HTTP timeout value to a specific value in seconds. (default: 0)
   --dns-timeout value          Set the DNS timeout value to a specific value in seconds. Used only when performing authoritative name servers queries. (default: 10)
   --pem                        Generate a .pem file by concatenating the .key and .crt files together.
   --cert.timeout value         Set the certificate timeout value to a specific value in seconds. Only used when obtaining certificates. (default: 30)
   --help, -h                   show help
   --version, -v                print the version
Sudo

The CLI does not require root permissions but needs to bind to port 80 and 443 for certain challenges. To run the CLI without sudo, you have four options:

  • Use setcap 'cap_net_bind_service=+ep' /path/to/program
  • Pass the --http.port or/and the --tls.port option and specify a custom port to bind to. In this case you have to forward port 80/443 to these custom ports (see Port Usage).
  • Pass the --http.webroot option and specify the path to your webroot folder. In this case the challenge will be written in a file in .well-known/acme-challenge/ inside your webroot.
  • Pass the --dns option and specify a DNS provider.
Port Usage

By default lego assumes it is able to bind to ports 80 and 443 to solve challenges. If this is not possible in your environment, you can use the --http.port and --tls.port options to instruct lego to listen on that interface:port for any incoming challenges.

If you are using this option, make sure you proxy all of the following traffic to these ports.

HTTP Port:

  • All plaintext HTTP requests to port 80 which begin with a request path of /.well-known/acme-challenge/ for the HTTP challenge.

TLS Port:

  • All TLS handshakes on port 443 for the TLS-ALPN challenge.

This traffic redirection is only needed as long as lego solves challenges. As soon as you have received your certificates you can deactivate the forwarding.

CLI Example

Assumes the lego binary has permission to bind to ports 80 and 443. You can get a pre-built binary from the releases page. If your environment does not allow you to bind to these ports, please read Port Usage.

Obtain a certificate:

lego --email="foo@bar.com" --domains="example.com" --http run

(Find your certificate in the .lego folder of current working directory.)

To renew the certificate:

lego --email="foo@bar.com" --domains="example.com" --http renew

To renew the certificate only if it expires within 30 days

lego --email="foo@bar.com" --domains="example.com" --http renew --days 30

Obtain a certificate using the DNS challenge and AWS Route 53:

AWS_REGION=us-east-1 AWS_ACCESS_KEY_ID=my_id AWS_SECRET_ACCESS_KEY=my_key lego --email="foo@bar.com" --domains="example.com" --dns="route53" run

Obtain a certificate given a certificate signing request (CSR) generated by something else:

lego --email="foo@bar.com" --http --csr=/path/to/csr.pem run

(lego will infer the domains to be validated based on the contents of the CSR, so make sure the CSR's Common Name and optional SubjectAltNames are set correctly.)

lego defaults to communicating with the production Let's Encrypt ACME server. If you'd like to test something without issuing real certificates, consider using the staging endpoint instead:

lego --server=https://acme-staging-v02.api.letsencrypt.org/directory …

ACME Library Usage

A valid, but bare-bones example use of the acme package:

package main

import (
	"crypto"
	"crypto/ecdsa"
	"crypto/elliptic"
	"crypto/rand"
	"fmt"
	"log"

	"github.com/xenolf/lego/certcrypto"
	"github.com/xenolf/lego/certificate"
	"github.com/xenolf/lego/challenge/http01"
	"github.com/xenolf/lego/challenge/tlsalpn01"
	"github.com/xenolf/lego/lego"
	"github.com/xenolf/lego/registration"
)

// You'll need a user or account type that implements acme.User
type MyUser struct {
	Email        string
	Registration *registration.Resource
	key          crypto.PrivateKey
}

func (u *MyUser) GetEmail() string {
	return u.Email
}
func (u MyUser) GetRegistration() *registration.Resource {
	return u.Registration
}
func (u *MyUser) GetPrivateKey() crypto.PrivateKey {
	return u.key
}

func main() {

	// Create a user. New accounts need an email and private key to start.
	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
	if err != nil {
		log.Fatal(err)
	}

	myUser := MyUser{
		Email: "you@yours.com",
		key:   privateKey,
	}

	config := lego.NewConfig(&myUser)

	// This CA URL is configured for a local dev instance of Boulder running in Docker in a VM.
	config.CADirURL = "http://192.168.99.100:4000/directory"
	config.Certificate.KeyType = certcrypto.RSA2048

	// A client facilitates communication with the CA server.
	client, err := lego.NewClient(config)
	if err != nil {
		log.Fatal(err)
	}

	// We specify an http port of 5002 and an tls port of 5001 on all interfaces
	// because we aren't running as root and can't bind a listener to port 80 and 443
	// (used later when we attempt to pass challenges). Keep in mind that you still
	// need to proxy challenge traffic to port 5002 and 5001.
	err = client.Challenge.SetHTTP01Provider(http01.NewProviderServer("", "5002"))
	if err != nil {
		log.Fatal(err)
	}
	err = client.Challenge.SetTLSALPN01Provider(tlsalpn01.NewProviderServer("", "5001"))
	if err != nil {
		log.Fatal(err)
	}

	// New users will need to register
	reg, err := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
	if err != nil {
		log.Fatal(err)
	}
	myUser.Registration = reg

	request := certificate.ObtainRequest{
		Domains: []string{"mydomain.com"},
		Bundle:  true,
	}
	certificates, err := client.Certificate.Obtain(request)
	if err != nil {
		log.Fatal(err)
	}

	// Each certificate comes back with the cert bytes, the bytes of the client's
	// private key, and a certificate URL. SAVE THESE TO DISK.
	fmt.Printf("%#v\n", certificates)

	// ... all done.
}

DNS Challenge API Details

AWS Route 53

The following AWS IAM policy document describes the permissions required for lego to complete the DNS challenge.

{
   "Version": "2012-10-17",
   "Statement": [
       {
           "Sid": "",
           "Effect": "Allow",
           "Action": [
               "route53:GetChange",
               "route53:ChangeResourceRecordSets",
               "route53:ListResourceRecordSets"
           ],
           "Resource": [
               "arn:aws:route53:::hostedzone/*",
               "arn:aws:route53:::change/*"
           ]
       },
       {
           "Sid": "",
           "Effect": "Allow",
           "Action": "route53:ListHostedZonesByName",
           "Resource": "*"
       }
   ]
}

ACME v1

lego introduced support for ACME v2 in v1.0.0, if you still need to utilize ACME v1, you can do so by using the v0.5.0 version.

Directories

Path Synopsis
Package acme contains all objects related the ACME endpoints.
Package acme contains all objects related the ACME endpoints.
api
cmd
lego
Let's Encrypt client to go! CLI application for generating Let's Encrypt certificates using the ACME package.
Let's Encrypt client to go! CLI application for generating Let's Encrypt certificates using the ACME package.
e2e
platform
providers
dns
dns/acmedns
Package acmedns implements a DNS provider for solving DNS-01 challenges using Joohoi's acme-dns project.
Package acmedns implements a DNS provider for solving DNS-01 challenges using Joohoi's acme-dns project.
dns/alidns
Package alidns implements a DNS provider for solving the DNS-01 challenge using Alibaba Cloud DNS.
Package alidns implements a DNS provider for solving the DNS-01 challenge using Alibaba Cloud DNS.
dns/auroradns
Package auroradns implements a DNS provider for solving the DNS-01 challenge using Aurora DNS.
Package auroradns implements a DNS provider for solving the DNS-01 challenge using Aurora DNS.
dns/azure
Package azure implements a DNS provider for solving the DNS-01 challenge using azure DNS.
Package azure implements a DNS provider for solving the DNS-01 challenge using azure DNS.
dns/bluecat
Package bluecat implements a DNS provider for solving the DNS-01 challenge using a self-hosted Bluecat Address Manager.
Package bluecat implements a DNS provider for solving the DNS-01 challenge using a self-hosted Bluecat Address Manager.
dns/cloudflare
Package cloudflare implements a DNS provider for solving the DNS-01 challenge using cloudflare DNS.
Package cloudflare implements a DNS provider for solving the DNS-01 challenge using cloudflare DNS.
dns/cloudxns
Package cloudxns implements a DNS provider for solving the DNS-01 challenge using CloudXNS DNS.
Package cloudxns implements a DNS provider for solving the DNS-01 challenge using CloudXNS DNS.
dns/conoha
Package conoha implements a DNS provider for solving the DNS-01 challenge using ConoHa DNS.
Package conoha implements a DNS provider for solving the DNS-01 challenge using ConoHa DNS.
dns/digitalocean
Package digitalocean implements a DNS provider for solving the DNS-01 challenge using digitalocean DNS.
Package digitalocean implements a DNS provider for solving the DNS-01 challenge using digitalocean DNS.
dns/dnsimple
Package dnsimple implements a DNS provider for solving the DNS-01 challenge using dnsimple DNS.
Package dnsimple implements a DNS provider for solving the DNS-01 challenge using dnsimple DNS.
dns/dnsmadeeasy
Package dnsmadeeasy implements a DNS provider for solving the DNS-01 challenge using DNS Made Easy.
Package dnsmadeeasy implements a DNS provider for solving the DNS-01 challenge using DNS Made Easy.
dns/dnspod
Package dnspod implements a DNS provider for solving the DNS-01 challenge using dnspod DNS.
Package dnspod implements a DNS provider for solving the DNS-01 challenge using dnspod DNS.
dns/dreamhost
Package dreamhost implements a DNS provider for solving the DNS-01 challenge using DreamHost.
Package dreamhost implements a DNS provider for solving the DNS-01 challenge using DreamHost.
dns/duckdns
Package duckdns implements a DNS provider for solving the DNS-01 challenge using DuckDNS.
Package duckdns implements a DNS provider for solving the DNS-01 challenge using DuckDNS.
dns/dyn
Package dyn implements a DNS provider for solving the DNS-01 challenge using Dyn Managed DNS.
Package dyn implements a DNS provider for solving the DNS-01 challenge using Dyn Managed DNS.
dns/exec
Package exec implements a DNS provider which runs a program for adding/removing the DNS record.
Package exec implements a DNS provider which runs a program for adding/removing the DNS record.
dns/exoscale
Package exoscale implements a DNS provider for solving the DNS-01 challenge using exoscale DNS.
Package exoscale implements a DNS provider for solving the DNS-01 challenge using exoscale DNS.
dns/fastdns
Package fastdns implements a DNS provider for solving the DNS-01 challenge using FastDNS.
Package fastdns implements a DNS provider for solving the DNS-01 challenge using FastDNS.
dns/gandi
Package gandi implements a DNS provider for solving the DNS-01 challenge using Gandi DNS.
Package gandi implements a DNS provider for solving the DNS-01 challenge using Gandi DNS.
dns/gandiv5
Package gandiv5 implements a DNS provider for solving the DNS-01 challenge using Gandi LiveDNS api.
Package gandiv5 implements a DNS provider for solving the DNS-01 challenge using Gandi LiveDNS api.
dns/gcloud
Package gcloud implements a DNS provider for solving the DNS-01 challenge using Google Cloud DNS.
Package gcloud implements a DNS provider for solving the DNS-01 challenge using Google Cloud DNS.
dns/glesys
Package glesys implements a DNS provider for solving the DNS-01 challenge using GleSYS api.
Package glesys implements a DNS provider for solving the DNS-01 challenge using GleSYS api.
dns/godaddy
Package godaddy implements a DNS provider for solving the DNS-01 challenge using godaddy DNS.
Package godaddy implements a DNS provider for solving the DNS-01 challenge using godaddy DNS.
dns/hostingde
Package hostingde implements a DNS provider for solving the DNS-01 challenge using hosting.de.
Package hostingde implements a DNS provider for solving the DNS-01 challenge using hosting.de.
dns/httpreq
Package httpreq implements a DNS provider for solving the DNS-01 challenge through a HTTP server.
Package httpreq implements a DNS provider for solving the DNS-01 challenge through a HTTP server.
dns/iij
Package iij implements a DNS provider for solving the DNS-01 challenge using IIJ DNS.
Package iij implements a DNS provider for solving the DNS-01 challenge using IIJ DNS.
dns/inwx
Package inwx implements a DNS provider for solving the DNS-01 challenge using inwx dom robot
Package inwx implements a DNS provider for solving the DNS-01 challenge using inwx dom robot
dns/lightsail
Package lightsail implements a DNS provider for solving the DNS-01 challenge using AWS Lightsail DNS.
Package lightsail implements a DNS provider for solving the DNS-01 challenge using AWS Lightsail DNS.
dns/linode
Package linode implements a DNS provider for solving the DNS-01 challenge using Linode DNS.
Package linode implements a DNS provider for solving the DNS-01 challenge using Linode DNS.
dns/linodev4
Package linodev4 implements a DNS provider for solving the DNS-01 challenge using Linode DNS and Linode's APIv4
Package linodev4 implements a DNS provider for solving the DNS-01 challenge using Linode DNS and Linode's APIv4
dns/mydnsjp
Package mydnsjp implements a DNS provider for solving the DNS-01 challenge using MyDNS.jp.
Package mydnsjp implements a DNS provider for solving the DNS-01 challenge using MyDNS.jp.
dns/namecheap
Package namecheap implements a DNS provider for solving the DNS-01 challenge using namecheap DNS.
Package namecheap implements a DNS provider for solving the DNS-01 challenge using namecheap DNS.
dns/namedotcom
Package namedotcom implements a DNS provider for solving the DNS-01 challenge using Name.com's DNS service.
Package namedotcom implements a DNS provider for solving the DNS-01 challenge using Name.com's DNS service.
dns/netcup
Package netcup implements a DNS Provider for solving the DNS-01 challenge using the netcup DNS API.
Package netcup implements a DNS Provider for solving the DNS-01 challenge using the netcup DNS API.
dns/nifcloud
Package nifcloud implements a DNS provider for solving the DNS-01 challenge using NIFCLOUD DNS.
Package nifcloud implements a DNS provider for solving the DNS-01 challenge using NIFCLOUD DNS.
dns/ns1
Package ns1 implements a DNS provider for solving the DNS-01 challenge using NS1 DNS.
Package ns1 implements a DNS provider for solving the DNS-01 challenge using NS1 DNS.
dns/otc
Package otc implements a DNS provider for solving the DNS-01 challenge using Open Telekom Cloud Managed DNS.
Package otc implements a DNS provider for solving the DNS-01 challenge using Open Telekom Cloud Managed DNS.
dns/ovh
Package ovh implements a DNS provider for solving the DNS-01 challenge using OVH DNS.
Package ovh implements a DNS provider for solving the DNS-01 challenge using OVH DNS.
dns/pdns
Package pdns implements a DNS provider for solving the DNS-01 challenge using PowerDNS nameserver.
Package pdns implements a DNS provider for solving the DNS-01 challenge using PowerDNS nameserver.
dns/rackspace
Package rackspace implements a DNS provider for solving the DNS-01 challenge using rackspace DNS.
Package rackspace implements a DNS provider for solving the DNS-01 challenge using rackspace DNS.
dns/rfc2136
Package rfc2136 implements a DNS provider for solving the DNS-01 challenge using the rfc2136 dynamic update.
Package rfc2136 implements a DNS provider for solving the DNS-01 challenge using the rfc2136 dynamic update.
dns/route53
Package route53 implements a DNS provider for solving the DNS-01 challenge using AWS Route 53 DNS.
Package route53 implements a DNS provider for solving the DNS-01 challenge using AWS Route 53 DNS.
dns/sakuracloud
Package sakuracloud implements a DNS provider for solving the DNS-01 challenge using SakuraCloud DNS.
Package sakuracloud implements a DNS provider for solving the DNS-01 challenge using SakuraCloud DNS.
dns/selectel
Package selectel implements a DNS provider for solving the DNS-01 challenge using Selectel Domains API.
Package selectel implements a DNS provider for solving the DNS-01 challenge using Selectel Domains API.
dns/stackpath
Package stackpath implements a DNS provider for solving the DNS-01 challenge using Stackpath DNS.
Package stackpath implements a DNS provider for solving the DNS-01 challenge using Stackpath DNS.
dns/transip
Package transip implements a DNS provider for solving the DNS-01 challenge using TransIP.
Package transip implements a DNS provider for solving the DNS-01 challenge using TransIP.
dns/vegadns
Package vegadns implements a DNS provider for solving the DNS-01 challenge using VegaDNS.
Package vegadns implements a DNS provider for solving the DNS-01 challenge using VegaDNS.
dns/vscale
Package vscale implements a DNS provider for solving the DNS-01 challenge using Vscale Domains API.
Package vscale implements a DNS provider for solving the DNS-01 challenge using Vscale Domains API.
dns/vultr
Package vultr implements a DNS provider for solving the DNS-01 challenge using the vultr DNS.
Package vultr implements a DNS provider for solving the DNS-01 challenge using the vultr DNS.
http/memcached
Package memcached implements a HTTP provider for solving the HTTP-01 challenge using memcached in combination with a webserver.
Package memcached implements a HTTP provider for solving the HTTP-01 challenge using memcached in combination with a webserver.
http/webroot
Package webroot implements a HTTP provider for solving the HTTP-01 challenge using web server's root path.
Package webroot implements a HTTP provider for solving the HTTP-01 challenge using web server's root path.

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