Let’s Encrypt ACME client written in PHP

This library allows you to request, renew and revoke SSL certificates provided by Let's Encrypt.

If you're looking for an easy-to-use CLI tool for managing your LE certificates, take a look at the RW ACME CLI project.

Requirements

• PHP ^8.2
• OpenSSL >= 1.0.1
• cURL extension
• JSON extension

Notes:

• It's recommended to have dig installed on your system, as it will be used to fetch DNS information.
• v4 of this package only supports php:^8.2. If you're looking for the older versions, check out v1 or v3.

Installation

You can install the package via composer:

composer require rogierw/rw-acme-client

Usage

Create an instance of Rogierw\RwAcme\Api client and provide it with a local account that will be used to store the account keys.

$localAccount = new \Rogierw\RwAcme\Support\LocalFileAccount(__DIR__.'/__account', 'test@example.com');
$client = new Api(localAccount: $localAccount);

You could also create a client and pass the local account data later:

$client = new Api();

// Do some stuff.

$localAccount = new \Rogierw\RwAcme\Support\LocalFileAccount(__DIR__.'/__account', 'test@example.com');
$client->setLocalAccount($localAccount);

Please note that setting a local account is required before making any of the calls detailed below.

Creating an account

if (!$client->account()->exists()) {
    $account = $client->account()->create();
}

// Or get an existing account.
$account = $client->account()->get();

Difference between account and localAccount

• account is the account created at the ACME (Let's Encrypt) server with data from the localAccount.
• localAccount handles the private/public key pair and contact email address used to sign requests to the ACME server. Depending on the implementation, this data is stored locally or, for example, in a database.

Creating an order

$order = $client->order()->new($account, ['example.com']);

Renewal

Simply create a new order to renew an existing certificate as described above. Ensure that you use the same account as you did for the initial request.

Getting an order

$order = $client->order()->get($order->id);

Domain validation

Getting the DCV status

$validationStatus = $client->domainValidation()->status($order);

http-01

Get the name and content for the validation file:

// Get the data for the HTTP challenge; filename and content.
$validationData = $client->domainValidation()->getValidationData($validationStatus, \Rogierw\RwAcme\Enums\AuthorizationChallengeEnum::HTTP);

This returns an array:

Array
(
    [0] => Array
        (
            [type] => http-01
            [identifier] => example.com
            [filename] => sqQnDYNNywpkwuHeU4b4FTPI2mwSrDF13ti08YFMm9M
            [content] => sqQnDYNNywpkwuHeU4b4FTPI2mwSrDF13ti08YFMm9M.kB7_eWSDdG3aWIaPSp6Uy4vLBbBI5M0COvM-AZOBcoQ
        )
)

The Let's Encrypt validation server will make a request to the following URL:

http://example.com/.well-known/acme-challenge/sqQnDYNNywpkwuHeU4b4FTPI2mwSrDF13ti08YFMm9M

dns-01

Get the name and the value for the TXT record:

// Get the data for the DNS challenge.
$validationData = $client->domainValidation()->getValidationData($validationStatus, \Rogierw\RwAcme\Enums\AuthorizationChallengeEnum::DNS);

This returns an array:

Array
(
    [0] => Array
        (
            [type] => dns-01
            [identifier] => example.com
            [name] => _acme-challenge
            [value] => 8hSNdxGNkx4MI7ZN5F8uZj3cTSMX92SGMCMHQMh0cMA
        )
)

Start domain validation

http-01

try {
    $client->domainValidation()->start($account, $validationStatus[0], \Rogierw\RwAcme\Enums\AuthorizationChallengeEnum::HTTP);
} catch (DomainValidationException $exception) {
    // The local HTTP challenge test has been failed...
}

dns-01

try {
    $client->domainValidation()->start($account, $validationStatus[0], \Rogierw\RwAcme\Enums\AuthorizationChallengeEnum::DNS);
} catch (DomainValidationException $exception) {
    // The local DNS challenge test has been failed...
}

Generating a CSR

$privateKey = \Rogierw\RwAcme\Support\OpenSsl::generatePrivateKey();
$csr = \Rogierw\RwAcme\Support\OpenSsl::generateCsr(['example.com'], $privateKey);

Finalizing order

if ($order->isReady() && $client->domainValidation()->allChallengesPassed($order)) {
    $client->order()->finalize($order, $csr);
}

Getting the actual certificate

if ($order->isFinalized()) {
    $certificateBundle = $client->certificate()->getBundle($order);
}

Revoke a certificate

if ($order->isValid()) {
    $client->certificate()->revoke($certificateBundle->fullchain);
}