137 lines
4.5 KiB
Markdown
137 lines
4.5 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)
|
|
|
|
This is a work in progress. Please do *NOT* run this on a production server.
|
|
|
|
Please report any bugs you find!
|
|
|
|
#### 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] SimpleHTTP Challenge (Scheduled for removal on Nov 19th)
|
|
- [x] HTTP (http-01)
|
|
- [ ] TLS with Server Name Indication (tls-sni-01)
|
|
- [ ] Proof of Possession of a Prior Key (proofOfPossession-01)
|
|
- [ ] 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
|
|
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:
|
|
./lego [global options] command [command options] [arguments...]
|
|
|
|
VERSION:
|
|
0.0.2
|
|
|
|
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-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.
|
|
--path "CWD/.lego" Directory to use for storing the data
|
|
--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
|
|
--help, -h show help
|
|
--version, -v print the version
|
|
|
|
```
|
|
|
|
|
|
#### 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.
|
|
// 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).
|
|
client, err := acme.NewClient("http://192.168.99.100:4000", &myUser, rsaKeySize, "5001")
|
|
if err != inl {
|
|
log.Fatal(err)
|
|
}
|
|
|
|
// 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)
|
|
}
|
|
|
|
// 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.
|
|
```
|