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<?php |
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/* |
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* This file is part of the LightSAML-Core package. |
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* |
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* (c) Milos Tomic <[email protected]> |
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* |
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* This source file is subject to the MIT license that is bundled |
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* with this source code in the file LICENSE. |
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*/ |
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namespace LightSaml\Model\XmlDSig; |
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use LightSaml\Credential\CredentialInterface; |
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use LightSaml\Credential\KeyHelper; |
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use LightSaml\Error\LightSamlSecurityException; |
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use RobRichards\XMLSecLibs\XMLSecurityKey; |
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abstract class AbstractSignatureReader extends Signature |
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{ |
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/** @var XMLSecurityKey|null */ |
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protected $key; |
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/** |
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* @param XMLSecurityKey $key |
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* |
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* @return bool True if validated, False if validation was not performed |
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* |
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* @throws \LightSaml\Error\LightSamlSecurityException If validation fails |
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*/ |
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abstract public function validate(XMLSecurityKey $key); |
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/** |
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* @return XMLSecurityKey|null |
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*/ |
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public function getKey() |
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{ |
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return $this->key; |
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} |
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/** |
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* @param CredentialInterface[] $credentialCandidates |
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* |
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* @throws \InvalidArgumentException If element of $credentialCandidates array is not CredentialInterface |
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* @throws \LightSaml\Error\LightSamlSecurityException If validation fails |
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* |
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* @return CredentialInterface|null Returns credential that validated the signature or null if validation was not performed |
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*/ |
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public function validateMulti(array $credentialCandidates) |
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{ |
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$lastException = null; |
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foreach ($credentialCandidates as $credential) { |
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if (false == $credential instanceof CredentialInterface) { |
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throw new \InvalidArgumentException('Expected CredentialInterface'); |
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} |
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if (null == $credential->getPublicKey()) { |
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continue; |
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} |
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try { |
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$result = $this->validate($credential->getPublicKey()); |
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if (false === $result) { |
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return null; |
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} |
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return $credential; |
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} catch (LightSamlSecurityException $ex) { |
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$lastException = $ex; |
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} |
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} |
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if ($lastException) { |
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throw $lastException; |
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} else { |
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throw new LightSamlSecurityException('No public key available for signature verification'); |
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} |
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} |
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/** |
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* @return string |
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*/ |
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abstract public function getAlgorithm(); |
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/** |
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* @param XMLSecurityKey $key |
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* |
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* @return XMLSecurityKey |
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*/ |
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protected function castKeyIfNecessary(XMLSecurityKey $key) |
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{ |
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$algorithm = $this->getAlgorithm(); |
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if (!in_array($algorithm, [ |
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XMLSecurityKey::RSA_SHA1, |
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XMLSecurityKey::RSA_SHA256, |
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XMLSecurityKey::RSA_SHA384, |
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XMLSecurityKey::RSA_SHA512, |
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])) { |
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throw new LightSamlSecurityException(sprintf('Unsupported signing algorithm: "%s"', $algorithm)); |
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} |
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if ($algorithm != $key->type) { |
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$key = KeyHelper::castKey($key, $algorithm); |
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} |
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return $key; |
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} |
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} |
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When comparing two booleans, it is generally considered safer to use the strict comparison operator.