/**
* @param \SAML2\EncryptedAssertion $assertion
*
* @return \SAML2\Assertion
*/
public function decrypt(EncryptedAssertion $assertion)
{
$decryptionKeys = $this->privateKeyLoader->loadDecryptionKeys($this->identityProvider, $this->serviceProvider);
$blacklistedKeys = $this->identityProvider->getBlacklistedAlgorithms();
if (is_null($blacklistedKeys)) {
$blacklistedKeys = $this->serviceProvider->getBlacklistedAlgorithms();
}
// reflects the simplesamlphp behaviour for BC, see
// https://github.com/simplesamlphp/simplesamlphp/blob/3d735912342767d391297cc5e13272a76730aca0/modules/saml/lib/Message.php#L369
foreach ($decryptionKeys as $index => $key) {
try {
$decryptedAssertion = $assertion->getAssertion($key, $blacklistedKeys);
$this->logger->debug(sprintf('Decrypted Assertion with key "#%d"', $index));
return $decryptedAssertion;
} catch (\Exception $e) {
$this->logger->debug(sprintf('Could not decrypt assertion with key "#%d", "%s" thrown: "%s"', $index, get_class($e), $e->getMessage()));
}
}
throw new NotDecryptedException(sprintf('Could not decrypt the assertion, tried with "%d" keys. See the debug log for more information', count($decryptionKeys)));
}
/**
* Decrypt an assertion.
*
* This function takes in a \SAML2\Assertion and decrypts it if it is encrypted.
* If it is unencrypted, and encryption is enabled in the metadata, an exception
* will be throws.
*
* @param SimpleSAML_Configuration $srcMetadata The metadata of the sender (IdP).
* @param SimpleSAML_Configuration $dstMetadata The metadata of the recipient (SP).
* @param \SAML2\Assertion|\SAML2\EncryptedAssertion $assertion The assertion we are decrypting.
* @return \SAML2\Assertion The assertion.
*/
private static function decryptAssertion(SimpleSAML_Configuration $srcMetadata, SimpleSAML_Configuration $dstMetadata, $assertion)
{
assert('$assertion instanceof \\SAML2\\Assertion || $assertion instanceof \\SAML2\\EncryptedAssertion');
if ($assertion instanceof \SAML2\Assertion) {
$encryptAssertion = $srcMetadata->getBoolean('assertion.encryption', NULL);
if ($encryptAssertion === NULL) {
$encryptAssertion = $dstMetadata->getBoolean('assertion.encryption', FALSE);
}
if ($encryptAssertion) {
/* The assertion was unencrypted, but we have encryption enabled. */
throw new Exception('Received unencrypted assertion, but encryption was enabled.');
}
return $assertion;
}
try {
$keys = self::getDecryptionKeys($srcMetadata, $dstMetadata);
} catch (Exception $e) {
throw new SimpleSAML_Error_Exception('Error decrypting assertion: ' . $e->getMessage());
}
$blacklist = self::getBlacklistedAlgorithms($srcMetadata, $dstMetadata);
$lastException = NULL;
foreach ($keys as $i => $key) {
try {
$ret = $assertion->getAssertion($key, $blacklist);
SimpleSAML\Logger::debug('Decryption with key #' . $i . ' succeeded.');
return $ret;
} catch (Exception $e) {
SimpleSAML\Logger::debug('Decryption with key #' . $i . ' failed with exception: ' . $e->getMessage());
$lastException = $e;
}
}
throw $lastException;
}
