How to verify Apple JWS?

[imdhemy]

Below is a signed payload by Apple. (Test notification)

eyJhbGciOiJFUzI1NiIsIng1YyI6WyJNSUlFTURDQ0E3YWdBd0lCQWdJUWFQb1BsZHZwU29FSDBsQnJqRFB2OWpBS0JnZ3Foa2pPUFFRREF6QjFNVVF3UWdZRFZRUURERHRCY0hCc1pTQlhiM0pzWkhkcFpHVWdSR1YyWld4dmNHVnlJRkpsYkdGMGFXOXVjeUJEWlhKMGFXWnBZMkYwYVc5dUlFRjFkR2h2Y21sMGVURUxNQWtHQTFVRUN3d0NSell4RXpBUkJnTlZCQW9NQ2tGd2NHeGxJRWx1WXk0eEN6QUpCZ05WQkFZVEFsVlRNQjRYRFRJeE1EZ3lOVEF5TlRBek5Gb1hEVEl6TURreU5EQXlOVEF6TTFvd2daSXhRREErQmdOVkJBTU1OMUJ5YjJRZ1JVTkRJRTFoWXlCQmNIQWdVM1J2Y21VZ1lXNWtJR2xVZFc1bGN5QlRkRzl5WlNCU1pXTmxhWEIwSUZOcFoyNXBibWN4TERBcUJnTlZCQXNNSTBGd2NHeGxJRmR2Y214a2QybGtaU0JFWlhabGJHOXdaWElnVW1Wc1lYUnBiMjV6TVJNd0VRWURWUVFLREFwQmNIQnNaU0JKYm1NdU1Rc3dDUVlEVlFRR0V3SlZVekJaTUJNR0J5cUdTTTQ5QWdFR0NDcUdTTTQ5QXdFSEEwSUFCT29UY2FQY3BlaXBOTDllUTA2dEN1N3BVY3dkQ1hkTjh2R3FhVWpkNThaOHRMeGlVQzBkQmVBK2V1TVlnZ2gxLzVpQWsrRk14VUZtQTJhMXI0YUNaOFNqZ2dJSU1JSUNCREFNQmdOVkhSTUJBZjhFQWpBQU1COEdBMVVkSXdRWU1CYUFGRDh2bENOUjAxREptaWc5N2JCODVjK2xrR0taTUhBR0NDc0dBUVVGQndFQkJHUXdZakF0QmdnckJnRUZCUWN3QW9ZaGFIUjBjRG92TDJObGNuUnpMbUZ3Y0d4bExtTnZiUzkzZDJSeVp6WXVaR1Z5TURFR0NDc0dBUVVGQnpBQmhpVm9kSFJ3T2k4dmIyTnpjQzVoY0hCc1pTNWpiMjB2YjJOemNEQXpMWGQzWkhKbk5qQXlNSUlCSGdZRFZSMGdCSUlCRlRDQ0FSRXdnZ0VOQmdvcWhraUc5Mk5rQlFZQk1JSCtNSUhEQmdnckJnRUZCUWNDQWpDQnRneUJzMUpsYkdsaGJtTmxJRzl1SUhSb2FYTWdZMlZ5ZEdsbWFXTmhkR1VnWW5rZ1lXNTVJSEJoY25SNUlHRnpjM1Z0WlhNZ1lXTmpaWEIwWVc1alpTQnZaaUIwYUdVZ2RHaGxiaUJoY0hCc2FXTmhZbXhsSUhOMFlXNWtZWEprSUhSbGNtMXpJR0Z1WkNCamIyNWthWFJwYjI1eklHOW1JSFZ6WlN3Z1kyVnlkR2xtYVdOaGRHVWdjRzlzYVdONUlHRnVaQ0JqWlhKMGFXWnBZMkYwYVc5dUlIQnlZV04wYVdObElITjBZWFJsYldWdWRITXVNRFlHQ0NzR0FRVUZCd0lCRmlwb2RIUndPaTh2ZDNkM0xtRndjR3hsTG1OdmJTOWpaWEowYVdacFkyRjBaV0YxZEdodmNtbDBlUzh3SFFZRFZSME9CQllFRkNPQ21NQnEvLzFMNWltdlZtcVgxb0NZZXFyTU1BNEdBMVVkRHdFQi93UUVBd0lIZ0RBUUJnb3Foa2lHOTJOa0Jnc0JCQUlGQURBS0JnZ3Foa2pPUFFRREF3Tm9BREJsQWpFQWw0SkI5R0pIaXhQMm51aWJ5VTFrM3dyaTVwc0dJeFBNRTA1c0ZLcTdoUXV6dmJleUJ1ODJGb3p6eG1ienBvZ29BakJMU0ZsMGRaV0lZbDJlalBWK0RpNWZCbktQdThteW1CUXRvRS9IMmJFUzBxQXM4Yk51ZVUzQ0JqamgxbHduRHNJPSIsIk1JSURGakNDQXB5Z0F3SUJBZ0lVSXNHaFJ3cDBjMm52VTRZU3ljYWZQVGp6Yk5jd0NnWUlLb1pJemowRUF3TXdaekViTUJrR0ExVUVBd3dTUVhCd2JHVWdVbTl2ZENCRFFTQXRJRWN6TVNZd0pBWURWUVFMREIxQmNIQnNaU0JEWlhKMGFXWnBZMkYwYVc5dUlFRjFkR2h2Y21sMGVURVRNQkVHQTFVRUNnd0tRWEJ3YkdVZ1NXNWpMakVMTUFrR0ExVUVCaE1DVlZNd0hoY05NakV3TXpFM01qQXpOekV3V2hjTk16WXdNekU1TURBd01EQXdXakIxTVVRd1FnWURWUVFERER0QmNIQnNaU0JYYjNKc1pIZHBaR1VnUkdWMlpXeHZjR1Z5SUZKbGJHRjBhVzl1Y3lCRFpYSjBhV1pwWTJGMGFXOXVJRUYxZEdodmNtbDBlVEVMTUFrR0ExVUVDd3dDUnpZeEV6QVJCZ05WQkFvTUNrRndjR3hsSUVsdVl5NHhDekFKQmdOVkJBWVRBbFZUTUhZd0VBWUhLb1pJemowQ0FRWUZLNEVFQUNJRFlnQUVic1FLQzk0UHJsV21aWG5YZ3R4emRWSkw4VDBTR1luZ0RSR3BuZ24zTjZQVDhKTUViN0ZEaTRiQm1QaENuWjMvc3E2UEYvY0djS1hXc0w1dk90ZVJoeUo0NXgzQVNQN2NPQithYW85MGZjcHhTdi9FWkZibmlBYk5nWkdoSWhwSW80SDZNSUgzTUJJR0ExVWRFd0VCL3dRSU1BWUJBZjhDQVFBd0h3WURWUjBqQkJnd0ZvQVV1N0Rlb1ZnemlKcWtpcG5ldnIzcnI5ckxKS3N3UmdZSUt3WUJCUVVIQVFFRU9qQTRNRFlHQ0NzR0FRVUZCekFCaGlwb2RIUndPaTh2YjJOemNDNWhjSEJzWlM1amIyMHZiMk56Y0RBekxXRndjR3hsY205dmRHTmhaek13TndZRFZSMGZCREF3TGpBc29DcWdLSVltYUhSMGNEb3ZMMk55YkM1aGNIQnNaUzVqYjIwdllYQndiR1Z5YjI5MFkyRm5NeTVqY213d0hRWURWUjBPQkJZRUZEOHZsQ05SMDFESm1pZzk3YkI4NWMrbGtHS1pNQTRHQTFVZER3RUIvd1FFQXdJQkJqQVFCZ29xaGtpRzkyTmtCZ0lCQkFJRkFEQUtCZ2dxaGtqT1BRUURBd05vQURCbEFqQkFYaFNxNUl5S29nTUNQdHc0OTBCYUI2NzdDYUVHSlh1ZlFCL0VxWkdkNkNTamlDdE9udU1UYlhWWG14eGN4ZmtDTVFEVFNQeGFyWlh2TnJreFUzVGtVTUkzM3l6dkZWVlJUNHd4V0pDOTk0T3NkY1o0K1JHTnNZRHlSNWdtZHIwbkRHZz0iLCJNSUlDUXpDQ0FjbWdBd0lCQWdJSUxjWDhpTkxGUzVVd0NnWUlLb1pJemowRUF3TXdaekViTUJrR0ExVUVBd3dTUVhCd2JHVWdVbTl2ZENCRFFTQXRJRWN6TVNZd0pBWURWUVFMREIxQmNIQnNaU0JEWlhKMGFXWnBZMkYwYVc5dUlFRjFkR2h2Y21sMGVURVRNQkVHQTFVRUNnd0tRWEJ3YkdVZ1NXNWpMakVMTUFrR0ExVUVCaE1DVlZNd0hoY05NVFF3TkRNd01UZ3hPVEEyV2hjTk16a3dORE13TVRneE9UQTJXakJuTVJzd0dRWURWUVFEREJKQmNIQnNaU0JTYjI5MElFTkJJQzBnUnpNeEpqQWtCZ05WQkFzTUhVRndjR3hsSUVObGNuUnBabWxqWVhScGIyNGdRWFYwYUc5eWFYUjVNUk13RVFZRFZRUUtEQXBCY0hCc1pTQkpibU11TVFzd0NRWURWUVFHRXdKVlV6QjJNQkFHQnlxR1NNNDlBZ0VHQlN1QkJBQWlBMklBQkpqcEx6MUFjcVR0a3lKeWdSTWMzUkNWOGNXalRuSGNGQmJaRHVXbUJTcDNaSHRmVGpqVHV4eEV0WC8xSDdZeVlsM0o2WVJiVHpCUEVWb0EvVmhZREtYMUR5eE5CMGNUZGRxWGw1ZHZNVnp0SzUxN0lEdll1VlRaWHBta09sRUtNYU5DTUVBd0hRWURWUjBPQkJZRUZMdXczcUZZTTRpYXBJcVozcjY5NjYvYXl5U3JNQThHQTFVZEV3RUIvd1FGTUFNQkFmOHdEZ1lEVlIwUEFRSC9CQVFEQWdFR01Bb0dDQ3FHU000OUJBTURBMmdBTUdVQ01RQ0Q2Y0hFRmw0YVhUUVkyZTN2OUd3T0FFWkx1Tit5UmhIRkQvM21lb3locG12T3dnUFVuUFdUeG5TNGF0K3FJeFVDTUcxbWloREsxQTNVVDgyTlF6NjBpbU9sTTI3amJkb1h0MlFmeUZNbStZaGlkRGtMRjF2TFVhZ002QmdENTZLeUtBPT0iXX0.eyJub3RpZmljYXRpb25UeXBlIjoiVEVTVCIsIm5vdGlmaWNhdGlvblVVSUQiOiI1ZTA5ZGNmYy0yMDVlLTRlYTEtOTg4My05NjY3NmYzOTQ5OTIiLCJkYXRhIjp7ImJ1bmRsZUlkIjoiY29tLkFiaWxpdGllcyIsImVudmlyb25tZW50IjoiU2FuZGJveCJ9LCJ2ZXJzaW9uIjoiMi4wIiwic2lnbmVkRGF0ZSI6MTY2MjEyMjQ5Mjg4NH0.XD_oBUwoVRmdp_KsYT9oyLxrV4bK-XMhsJOaFMndiRdsDjdcRPEuiZX2eKoegHOHAAlPvxl4xSQm0l3pyUY57Q

It should be verified against:

• the root certificate: Apple Root CA - G3 Root
• the intermediate certificate: Worldwide Developer Relations -G6

The alg is ES256 and the headers contain an x5c key with has 3 certificates.

Quoting from Apple

To verify the signature, you will need to use the claims available in the header portion of the signed transaction info. Use the alg claim to know what signing algorithm we used, and use the certificate chain in the array in the x5c claim.

Once you have these two things, you can use your favorite cryptographic library to verify the signature of the signed transaction info.

[lcobucci]

@imdhemy I believe the answer you seek is on the JWS RFC:

The certificate or certificate chain is represented as a JSON array of certificate value strings.
Each string in the array is a base64-encoded (Section 4 of [RFC4648] -- not base64url-encoded) DER [ITU.X690.2008] PKIX certificate value.
The certificate containing the public key corresponding to the key used to digitally sign the JWS MUST be the first certificate.
This MAY be followed by additional certificates, with each subsequent certificate being the one used to certify the previous one.
The recipient MUST validate the certificate chain according to RFC 5280 [RFC5280] and consider the certificate or certificate chain to be invalid if any validation failure occurs.

We don't have a constraint that implements that logic but nothing prevents you from building a custom constraint for your system using openssl_x509_* functions and plugging it into the validation component.

It's very important not to blindly trust what's on the token, hence the recommendation to verify the received chain against the root and intermediate certificates. I didn't run extensive tests but believe something like this should work:

use Lcobucci\JWT\Signer;
use Lcobucci\JWT\Signer\Key\InMemory;
use Lcobucci\JWT\Token;
use Lcobucci\JWT\Validation\Constraint\SignedWith;
use Lcobucci\JWT\Validation\ConstraintViolation;
use Lcobucci\JWT\Validation\SignedWith as SignedWithInterface;
use OpenSSLCertificate;

use function array_map;
use function openssl_x509_export;
use function openssl_x509_fingerprint;
use function openssl_x509_read;
use function openssl_x509_verify;

final class SignedWithChain implements SignedWithInterface
{
    /** @param list<string> $expectedFingerprintChain */
    public function __construct(
        private readonly Signer $algorithm,
        private readonly array  $expectedFingerprintChain,
    ) {
    }

    public function assert(Token $token): void
    {
        $chain = array_map(self::base64DerToCertificate(...), $token->headers()->get('x5c', []));

        if ($chain === []) {
            throw ConstraintViolation::error('No certificate chain available', $this);
        }

        $receivedFingerprints = [];

        for ($i = 0, $max = count($chain); $i < $max; ++$i) {
            $current = $chain[$i];
            $next = $chain[$i + 1] ?? null;

            if ($i !== 0) {
                $receivedFingerprints[] = openssl_x509_fingerprint($current);
            }

            if ($next !== null && openssl_x509_verify($current, $next) !== 1) {
                throw ConstraintViolation::error('Error verifying certificate chain', $this);
            }
        }

        if ($receivedFingerprints !== $this->expectedFingerprintChain) {
            throw ConstraintViolation::error('Certificate chain differs from expected fingerprints', $this);
        }

        openssl_x509_export($chain[0], $exportedCertificate);

        (new SignedWith($this->algorithm, InMemory::plainText($exportedCertificate)))->assert($token);
    }

    private static function base64DerToCertificate(string $certificate): OpenSSLCertificate
    {
        return openssl_x509_read(
            '-----BEGIN CERTIFICATE-----' . PHP_EOL . $certificate . PHP_EOL . '-----END CERTIFICATE-----'
        );
    }
}

Being used like this:

<?php
declare(strict_types=1);

namespace MyApp\Apple\TokenValidation;

use Lcobucci\JWT\Encoding\CannotDecodeContent;
use Lcobucci\JWT\Encoding\JoseEncoder;
use Lcobucci\JWT\Signer\Ecdsa\Sha256;
use Lcobucci\JWT\Token\InvalidTokenStructure;
use Lcobucci\JWT\Token\Parser;
use Lcobucci\JWT\Token\UnsupportedHeaderFound;
use Lcobucci\JWT\UnencryptedToken;
use Lcobucci\JWT\Validation\Validator;

require 'vendor/autoload.php';

$parser = new Parser(new JoseEncoder());

try {
    $token = $parser->parse(
        '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.eyJub3RpZmljYXRpb25UeXBlIjoiVEVTVCIsIm5vdGlmaWNhdGlvblVVSUQiOiI1ZTA5ZGNmYy0yMDVlLTRlYTEtOTg4My05NjY3NmYzOTQ5OTIiLCJkYXRhIjp7ImJ1bmRsZUlkIjoiY29tLkFiaWxpdGllcyIsImVudmlyb25tZW50IjoiU2FuZGJveCJ9LCJ2ZXJzaW9uIjoiMi4wIiwic2lnbmVkRGF0ZSI6MTY2MjEyMjQ5Mjg4NH0.XD_oBUwoVRmdp_KsYT9oyLxrV4bK-XMhsJOaFMndiRdsDjdcRPEuiZX2eKoegHOHAAlPvxl4xSQm0l3pyUY57Q'
    );
} catch (CannotDecodeContent | InvalidTokenStructure | UnsupportedHeaderFound $e) {
    echo 'Oh no, an error: ' . $e->getMessage();
    exit(1);
}

$validator = new Validator();
$validator->assert(
    $token,
    new SignedWithChain(
        Sha256::create(),
        [
            '0be38bfe21fd434d8cc51cbe0e2bc7758ddbf97b', // Fingerprint of https://www.apple.com/certificateauthority/AppleWWDRCAG6.cer
            'b52cb02fd567e0359fe8fa4d4c41037970fe01b0', // Fingerprint of https://www.apple.com/certificateauthority/AppleRootCA-G3.cer
        ],
    )
);

[imdhemy]

@lcobucci Great! Thank you! 🙌

[bohanyang]

Just made this: https://github.com/manyou-io/x509-chain-verifier