Acme/PKI

Tiny PKI based on Acme/client.

Licensed under AGPLv3+.

Usage

Registration

Usage: letsencrypt register <email>

Generate secret key

Usage: letsencrypt key <domain> [options]
	-r, --rsa [KEYSIZE]              RSA key, key size
	-e, --ecc [CURVE]                ECC key, curve

Generate a key (default is an EC secp384r1 key) in example.bar.foo.pem

letsencrypt key foo.bar.example

Default key is an EC secp384r1.

Generate certificate request

Usage: letsencrypt csr <domain> [options]
	-k, --key [KEYFILE]              Key file
	-d, --domains [DOMAINS]          Domains

Generate a certificate request in example.bar.foo.csr

letsencrypt csr foo.bar.example

If you have multiple domains

letsencrypt csr foo.example -d bar.example -d baz.example

Request certificate

Usage: letsencrypt crt <domain> [options]
	-c, --csr [CSR]                  CSR file

Request the corresponding certificate in example.bar.foo.crt

letsencrypt crt foo.bar.example

You can call directly the certificate issuance, CSR and key will be created when needed.

Renew certificate

Usage: letsencrypt renew <domain> [options]
	-c, --csr [CSR]                  CSR file

Renew the example.bar.foo.crt if needed (default is 30d before expiration).

letsencrypt renew foo.bar.example

If certificate was renewed, return code is 0 else 1, for post-action on crontab for example

#!/bin/bash
cd /etc/ssl/private

if letsencrypt renew foo.bar.example; then
	service apache2 reload
fi

Get information from key or certificate

letsencrypt info <domain> [options]
	-k, --key                        Key information
	-c, --crt                        Certificate information

Display various information (fingerprints, HPKP, TLSA…) for key or certificate.

letsencrypt info foo.bar.example
letsencrypt info -c foo.bar.example

Environment variables

You can define which ACME endpoint is used with ACME_ENDPOINT environment variable. Default is Let’s encrypt production endpoint (https://acme-v01.api.letsencrypt.org/). You can use Let’s encrypt staging endpoint (https://acme-staging.api.letsencrypt.org/) for testing.

Default account key is account.key in the current directory. You can specify another key file with ACME_ACCOUNT_KEY environment variable.

Default ACME challenge directory is acme-challenge in the current directory. You can change it with ACME_CHALLENGE environment variable.