forked from TrueCloudLab/lego
198 lines
7.3 KiB
Markdown
198 lines
7.3 KiB
Markdown
# lego
|
|
Let's Encrypt client and ACME library written in Go
|
|
|
|
[](https://godoc.org/github.com/xenolf/lego/acme)
|
|
[](https://travis-ci.org/xenolf/lego)
|
|
[](https://gitter.im/xenolf/lego)
|
|
|
|
#### General
|
|
This is a work in progress. Please do *NOT* run this on a production server and please report any bugs you find!
|
|
|
|
#### Installation
|
|
lego supports both binary installs and install from source.
|
|
|
|
To get the binary just download the latest release for your OS/Arch from [the release page](https://github.com/xenolf/lego/releases)
|
|
and put the binary somewhere convenient. lego does not assume anything about the location you run it from.
|
|
|
|
To install from source, just run
|
|
```
|
|
go get -u github.com/xenolf/lego
|
|
```
|
|
|
|
#### Current Status
|
|
The code in this repository is under development.
|
|
|
|
Current features:
|
|
- [x] Registering with a CA
|
|
- [x] Requesting Certificates
|
|
- [x] Renewing Certificates
|
|
- [x] Revoking Certificates
|
|
- [ ] Initiating account recovery
|
|
- Identifier validation challenges
|
|
- [x] HTTP (http-01)
|
|
- [x] TLS with Server Name Indication (tls-sni-01)
|
|
- [ ] Proof of Possession of a Prior Key (proofOfPossession-01)
|
|
- [x] DNS (dns-01)
|
|
- [x] Certificate bundling
|
|
- [x] Library support for OCSP
|
|
|
|
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.
|
|
|
|
#### 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 two options:
|
|
|
|
- Use setcap 'cap_net_bind_service=+ep' /path/to/program
|
|
- Pass the `--http` or/and the `--tls` 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](#port-usage)).
|
|
|
|
#### 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` and `--tls` 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-01 challenge.
|
|
|
|
TLS Port:
|
|
- All TLS handshakes on port 443 for TLS-SNI-01.
|
|
|
|
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.
|
|
|
|
#### Usage
|
|
|
|
```
|
|
NAME:
|
|
lego - Let's encrypt client to go!
|
|
|
|
USAGE:
|
|
./lego [global options] command [command options] [arguments...]
|
|
|
|
VERSION:
|
|
0.2.0
|
|
|
|
COMMANDS:
|
|
run Register an account, then create and install a certificate
|
|
revoke Revoke a certificate
|
|
renew Renew a certificate
|
|
help, h Shows a list of commands or help for one command
|
|
|
|
GLOBAL OPTIONS:
|
|
--domains, -d [--domains option --domains option] Add domains to the process
|
|
--server, -s "https://acme-v01.api.letsencrypt.org/directory" CA hostname (and optionally :port). The server certificate must be trusted in order to avoid further modifications to the client.
|
|
--email, -m Email used for registration and recovery contact.
|
|
--rsa-key-size, -B "2048" Size of the RSA key.
|
|
--path "${CWD}/.lego" Directory to use for storing the data
|
|
--exclude, -x [--exclude option --exclude option] Explicitly disallow solvers by name from being used. Solvers: "http-01", "tls-sni-01".
|
|
--http Set the port and interface to use for HTTP based challenges to listen on. Supported: interface:port or :port
|
|
--tls Set the port and interface to use for TLS based challenges to listen on. Supported: interface:port or :port
|
|
--dns Enable the DNS challenge for solving using a provider.
|
|
Credentials for providers have to be passed through environment variables.
|
|
For a more detailed explanation of the parameters, please see the online docs.
|
|
Valid providers:
|
|
cloudflare: CLOUDFLARE_EMAIL, CLOUDFLARE_API_KEY
|
|
digitalocean: DO_AUTH_TOKEN
|
|
dnsimple: DNSIMPLE_EMAIL, DNSIMPLE_API_KEY
|
|
route53: AWS_ACCESS_KEY_ID, AWS_SECRET_ACCESS_KEY, AWS_REGION
|
|
rfc2136: RFC2136_TSIG_KEY, RFC2136_TSIG_SECRET, RFC2136_NAMESERVER, RFC2136_ZONE
|
|
manual: none
|
|
--help, -h show help
|
|
--version, -v print the version
|
|
```
|
|
|
|
##### 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](https://github.com/xenolf/lego/releases) page.
|
|
If your environment does not allow you to bind to these ports, please read [Port Usage](#port-usage).
|
|
|
|
Obtain a certificate:
|
|
|
|
```bash
|
|
$ lego --email="foo@bar.com" --domains="example.com" run
|
|
```
|
|
|
|
(Find your certificate in the `.lego` folder of current working directory.)
|
|
|
|
To renew the certificate:
|
|
|
|
```bash
|
|
$ lego --email="foo@bar.com" --domains="example.com" renew
|
|
```
|
|
|
|
#### ACME Library Usage
|
|
|
|
A valid, but bare-bones example use of the acme package:
|
|
|
|
```go
|
|
// You'll need a user or account type that implements acme.User
|
|
type MyUser struct {
|
|
Email string
|
|
Registration *acme.RegistrationResource
|
|
key *rsa.PrivateKey
|
|
}
|
|
func (u MyUser) GetEmail() string {
|
|
return u.Email
|
|
}
|
|
func (u MyUser) GetRegistration() *acme.RegistrationResource {
|
|
return u.Registration
|
|
}
|
|
func (u MyUser) GetPrivateKey() *rsa.PrivateKey {
|
|
return u.key
|
|
}
|
|
|
|
// Create a user. New accounts need an email and private key to start.
|
|
const rsaKeySize = 2048
|
|
privateKey, err := rsa.GenerateKey(rand.Reader, rsaKeySize)
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
myUser := MyUser{
|
|
Email: "you@yours.com",
|
|
key: privateKey,
|
|
}
|
|
|
|
// A client facilitates communication with the CA server. This CA URL is
|
|
// configured for a local dev instance of Boulder running in Docker in a VM.
|
|
client, err := acme.NewClient("http://192.168.99.100:4000", &myUser, rsaKeySize)
|
|
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 we still need to proxy challenge traffic to port 5002 and 5001.
|
|
client.SetHTTPAddress(":5002")
|
|
client.SetTLSAddress(":5001")
|
|
|
|
// New users will need to register; be sure to save it
|
|
reg, err := client.Register()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
myUser.Registration = reg
|
|
|
|
// The client has a URL to the current Let's Encrypt Subscriber
|
|
// Agreement. The user will need to agree to it.
|
|
err = client.AgreeToTOS()
|
|
if err != nil {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// The acme library takes care of completing the challenges to obtain the certificate(s).
|
|
// Of course, the hostnames must resolve to this machine or it will fail.
|
|
bundle := false
|
|
certificates, failures := client.ObtainCertificate([]string{"mydomain.com"}, bundle, nil)
|
|
if len(failures) > 0 {
|
|
log.Fatal(failures)
|
|
}
|
|
|
|
// Each certificate comes back with the cert bytes, the bytes of the client's
|
|
// private key, and a certificate URL. This is where you should save them to files!
|
|
fmt.Printf("%#v\n", certificates)
|
|
|
|
// ... all done.
|
|
```
|