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# lego
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Let's Encrypt client and ACME library written in Go
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[![GoDoc ](https://godoc.org/github.com/xenolf/lego/acme?status.svg )](https://godoc.org/github.com/xenolf/lego/acme)
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[![Build Status ](https://travis-ci.org/xenolf/lego.svg?branch=master )](https://travis-ci.org/xenolf/lego)
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This is a work in progress. Please do *NOT* run this on a production server.
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Please report any bugs you find!
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#### Current Status
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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] SimpleHTTP Challenge
- [ ] DVSNI Challenge
- [ ] Proof of Possession of a Prior Key
- [ ] DNS Challenge
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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.
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#### Sudo
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I tried to not need sudo apart from challenges where binding to a privileged port is necessary.
To run the CLI without sudo, you have two options:
- Use ```setcap 'cap_net_bind_service=+ep' /path/to/program```
- Pass the --port option and specify a custom port to bind to. In this case you have to forward port 443 to this custom port.
#### Usage
```
NAME:
lego - Let's encrypt client to go!
USAGE:
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./lego [global options] command [command options] [arguments...]
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VERSION:
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0.0.2
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COMMANDS:
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run Register an account, then create and install a certificate
auth Create a certificate - must already have an account
revoke Revoke a certificate
renew Renew a certificate
help, h Shows a list of commands or help for one command
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GLOBAL OPTIONS:
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--domains, -d [--domains option --domains option] Add domains to the process
--server, -s "https://acme-staging.api.letsencrypt.org/" 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.
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--path "CWD" Directory to use for storing the data
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--port Challenges will use this port to listen on. Please make sure to forward port 443 to this port on your machine. Otherwise use setcap on the binary
--devMode If set to true, all client side challenge pre-tests are skipped.
--help, -h show help
--version, -v print the version
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```
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#### 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.
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const rsaKeySize = 2048
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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.
// We specify an optPort of 5001 because we aren't running as root and can't
// bind a listener to port 443 (used later when we attempt to pass challenge).
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client := acme.NewClient("http://192.168.99.100:4000", & myUser, rsaKeySize, "5001")
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// 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.
certificates, err := client.ObtainCertificates([]string{"mydomain.com"})
if err != nil {
log.Fatal(err)
}
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// Each certificate comes back with the cert bytes, the bytes of the client's
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// private key, and a certificate URL. This is where you should save them to files!
fmt.Printf("%#v\n", certificates)
// ... all done.
```