With vanilla PHP it's possible to check of if the SSL certificate of a given site is valid. But it's kinda madness to do it. Let's look at the code required:
<br />// Step 1: downloading the certificate from the site
$streamContext = stream_context_create([
'ssl' => [
'capture_peer_cert' => true,
],
]);
$client = stream_socket_client(
"ssl://spatie.be:443",
$errorNumber,
$errorDescription,
$timeout,
STREAM_CLIENT_CONNECT,
$streamContext);
$response = stream_context_get_params($client);
$certificateProperties = openssl_x509_parse($response['options']['ssl']['peer_certificate']);
// Step 2: parsing the certificate
/*
* I'm not even going to type out the further code needed.
*
* `$certificateProperties` has two keys `validFrom_time_t` and `validTo_time_t`.
* Those keys contain the UTC representation of the date.
* You will need to check if the current date is between those dates.
*/
What. The. Actual. F. Let's fix this!
We've released a new package named spatie/ssl-certificate that makes checking the SSL certificate of a site laughably easy. Let's take a look at the code:
$certificate = SslCertificate::createForHostName('spatie.be');
$certificate->isValid(); // returns true if the certificate is currently valid
Boom, done.
The package has a few more methods that makes working with an SSL certificate a breeze:
$certificate->getIssuer(); // returns "Let's Encrypt Authority X3"
$certificate->getDomain(); // returns "spatie.be"
//A certificate can cover multiple (sub)domains. Here's how to get them.
$certificate->getAdditionalDomains(); // returns ["spatie.be", "www.spatie.be]
$this->certificate->validFromDate(); // returns an instance of Carbon
$certificate->getExpirationDate(); // returns an instance of Carbon
You can also use isValid to determine if a given domain is covered by the certificate. Of course it'll keep checking if the current datetime is between validFromDate and expirationDate.
$this->certificate->isValid('spatie.be'); // returns true
$this->certificate->isValid('laravel.com'); // returns false
The source code of the package is available on GitHub. My company has made many more PHP framework agnostic, Laravel and JavaScript packages in the past. Take a look at the open source page at our site to see if we've made anything that could be of use to you.
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