/**
* Verify the bundled assertion
*
* Verifies if the bundled assertion is valid.
*
* @access public
* @param int $now Unix timestamp in milliseconds
* @return array Containing the array of certificates as 'certChain', the additional assertion payload as 'payload' and an assertion object as 'assertion'
*/
public function verify($now)
{
// no certs? not okay
if (sizeof($this->certs) == 0) {
throw new \Exception("no certificates provided");
}
// simplify error message
try {
// verify the chain
$certChain = $this->verifyChain($now);
} catch (Exception $e) {
$err = $e->getMessage();
// allow through the malformed signature
if ($err == 'malformed signature' || $err == "assertion issued later than verification date" || $err == "assertion has expired") {
throw $e;
} else {
throw new \Exception("bad signature in chain");
}
}
// what was the last PK in the successful chain?
$lastPK = $certChain[sizeof($certChain) - 1]->getCertParams()->getPublicKey();
$token = WebToken::parse($this->signedAssertion);
if (!$token->verify($lastPK)) {
throw new \Exception("signed assertion was not valid signed");
}
// now verify the assertion
$payload = $token->getPayload();
$assertion = Assertion::deserialize($payload);
if (!$assertion->verify($now)) {
throw new \Exception("assertion is not valid");
}
return array("certChain" => $certChain, "payload" => $payload, "assertion" => $assertion);
}
/**
* Get the public key of the basic support document of the identity provider
*
* @param optional string $name The basename of the certificate or null for default
* @param optional string $dir The directory to the certificate or null for default
* @return object An instance of the basic support document containing the public key or null
*/
static function readAndParseCert($name = null, $dir = null)
{
$p = Secrets::getPathPublicKey($name, $dir);
$cert = null;
// may throw
$cert = @file_get_contents($p);
if (!$cert) {
return null;
}
try {
// parse it
// it should be a JSON structure with alg and serialized key
// {alg: <ALG>, value: <SERIALIZED_KEY>}
$payloadSegment = WebToken::parse($cert)->getPayloadSegment();
return json_decode(Utils::base64url_decode($payloadSegment), true);
} catch (Exception $e) {
return null;
}
}
<pre>
<?php
// Comment the following line out to test the script!
die;
error_reporting(0);
require_once "../lib/browserid.php";
$publicKeyIdentity = AbstractPublicKey::deserialize('{"algorithm":"DS","p":"ff600483db6abfc5b45eab78594b3533d550d9f1bf2a992a7a8daa6dc34f8045ad4e6e0c429d334eeeaaefd7e23d4810be00e4cc1492cba325ba81ff2d5a5b305a8d17eb3bf4a06a349d392e00d329744a5179380344e82a18c47933438f891e22aeef812d69c8f75e326cb70ea000c3f776dfdbd604638c2ef717fc26d02e17","q":"e21e04f911d1ed7991008ecaab3bf775984309c3","g":"c52a4a0ff3b7e61fdf1867ce84138369a6154f4afa92966e3c827e25cfa6cf508b90e5de419e1337e07a2e9e2a3cd5dea704d175f8ebf6af397d69e110b96afb17c7a03259329e4829b0d03bbc7896b15b4ade53e130858cc34d96269aa89041f409136c7242a38895c9d5bccad4f389af1d7a4bd1398bd072dffa896233397a","y":"80942e74d41162e7ab30bb4a7a1e0fb0417aad0a1b55b12e0232618502a2552510d631a02a679e60787b12799215b9c35865efb4c86b56584bf85c31f886b25413dc7ef028917e9afbe35726849cfe28a43fba6cdd8e24f4575d5d582317183599c23399e90f10b7e5c0f2bcf7a37e0559dbe492a17a74a49597b0996a2b616d"}');
$secretKeyIdentity = AbstractSecretKey::deserialize('{"algorithm":"DS","p":"ff600483db6abfc5b45eab78594b3533d550d9f1bf2a992a7a8daa6dc34f8045ad4e6e0c429d334eeeaaefd7e23d4810be00e4cc1492cba325ba81ff2d5a5b305a8d17eb3bf4a06a349d392e00d329744a5179380344e82a18c47933438f891e22aeef812d69c8f75e326cb70ea000c3f776dfdbd604638c2ef717fc26d02e17","q":"e21e04f911d1ed7991008ecaab3bf775984309c3","g":"c52a4a0ff3b7e61fdf1867ce84138369a6154f4afa92966e3c827e25cfa6cf508b90e5de419e1337e07a2e9e2a3cd5dea704d175f8ebf6af397d69e110b96afb17c7a03259329e4829b0d03bbc7896b15b4ade53e130858cc34d96269aa89041f409136c7242a38895c9d5bccad4f389af1d7a4bd1398bd072dffa896233397a","x":"a8e62a39c007ab3b7fbaad2e51398c15ec4a720c"}');
$principal = $_REQUEST['principal'];
$audience = $_REQUEST['audience'];
echo "Usage: createBundle.php?principal=<principal>&audience=<audience>\r\n";
echo "Allowed keysizes: 64, 128, 256!\r\n";
$assertion = CertAssertion::createAssertion($audience, $secretKeyIdentity);
echo "Assertion: ";
var_dump(WebToken::parse($assertion)->getPayload());
echo "\r\n";
$identityCert = CertAssertion::createIdentityCert($principal, $publicKeyIdentity);
echo "Identity Cert: ";
var_dump(WebToken::parse($identityCert)->getPayload());
echo "\r\n";
$bundle = new CertBundle($assertion, array($identityCert));
$assertion = $bundle->bundle();
echo "Bundle: ";
var_dump($assertion);
echo "\r\n";
$certAssertion = new CertAssertion($assertion, $audience);
echo "isValid: ";
var_dump($certAssertion->isValid());
?>
</pre>
/**
* Parse serialized identity certificate
*
* Parses a serialized, signed identity certificate and check if it's valid by
* checking the signature against the public key of the issuer.
*
* @access public
* @static
* @param string $signedObject Signed identity certificate
* @param AbstractPublicKey $publicKey Public key of the issuer
* @return Cert Instance of the identity certificate
*/
public static function parse($signedObject, $publicKey)
{
$token = WebToken::parse($signedObject);
// try {
if (!$token->verify($publicKey)) {
throw new \Exception("cert was not valid signed");
}
/* } catch (\Exception $x) {
// can't extract components
throw new \Exception("cert was not valid signed");
}*/
$params = $token->getPayload();
return Cert::deserialize($params);
}
