PHP XMLSecEnc::locateKeyInfo方法代码示例

 /**
  * Decrypts an encrypted element.
  *
  * @param DOMElement     $encryptedData The encrypted data.
  * @param XMLSecurityKey $inputKey      The decryption key.
  *
  * @return DOMElement  The decrypted element.
  */
 public static function decryptElement(DOMElement $encryptedData, XMLSecurityKey $inputKey)
 {
     $enc = new XMLSecEnc();
     $enc->setNode($encryptedData);
     $enc->type = $encryptedData->getAttribute("Type");
     $symmetricKey = $enc->locateKey($encryptedData);
     if (!$symmetricKey) {
         throw new Exception('Could not locate key algorithm in encrypted data.');
     }
     $symmetricKeyInfo = $enc->locateKeyInfo($symmetricKey);
     if (!$symmetricKeyInfo) {
         throw new Exception('Could not locate <dsig:KeyInfo> for the encrypted key.');
     }
     $inputKeyAlgo = $inputKey->getAlgorith();
     if ($symmetricKeyInfo->isEncrypted) {
         $symKeyInfoAlgo = $symmetricKeyInfo->getAlgorith();
         if ($symKeyInfoAlgo === XMLSecurityKey::RSA_OAEP_MGF1P && $inputKeyAlgo === XMLSecurityKey::RSA_1_5) {
             $inputKeyAlgo = XMLSecurityKey::RSA_OAEP_MGF1P;
         }
         if ($inputKeyAlgo !== $symKeyInfoAlgo) {
             throw new Exception('Algorithm mismatch between input key and key used to encrypt ' . ' the symmetric key for the message. Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyInfoAlgo, true));
         }
         $encKey = $symmetricKeyInfo->encryptedCtx;
         $symmetricKeyInfo->key = $inputKey->key;
         $keySize = $symmetricKey->getSymmetricKeySize();
         if ($keySize === null) {
             // To protect against "key oracle" attacks
             throw new Exception('Unknown key size for encryption algorithm: ' . var_export($symmetricKey->type, true));
         }
         $key = $encKey->decryptKey($symmetricKeyInfo);
         if (strlen($key) != $keySize) {
             $encryptedKey = $encKey->getCipherValue();
             $pkey = openssl_pkey_get_details($symmetricKeyInfo->key);
             $pkey = sha1(serialize($pkey), true);
             $key = sha1($encryptedKey . $pkey, true);
             /* Make sure that the key has the correct length. */
             if (strlen($key) > $keySize) {
                 $key = substr($key, 0, $keySize);
             } elseif (strlen($key) < $keySize) {
                 $key = str_pad($key, $keySize);
             }
         }
         $symmetricKey->loadkey($key);
     } else {
         $symKeyAlgo = $symmetricKey->getAlgorith();
         if ($inputKeyAlgo !== $symKeyAlgo) {
             throw new Exception('Algorithm mismatch between input key and key in message. ' . 'Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyAlgo, true));
         }
         $symmetricKey = $inputKey;
     }
     $decrypted = $enc->decryptNode($symmetricKey, false);
     $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>';
     $newDoc = new DOMDocument();
     $newDoc->preserveWhiteSpace = false;
     $newDoc->formatOutput = true;
     $newDoc = self::loadXML($newDoc, $xml);
     if (!$newDoc) {
         throw new Exception('Failed to parse decrypted XML.');
     }
     $decryptedElement = $newDoc->firstChild->firstChild;
     if ($decryptedElement === null) {
         throw new Exception('Missing encrypted element.');
     }
     return $decryptedElement;
 }

 /**
  * Decrypts an encrypted element.
  *
  * @param DOMElement     $encryptedData The encrypted data.
  * @param XMLSecurityKey $inputKey      The decryption key.
  *
  * @return DOMElement  The decrypted element.
  */
 public static function decryptElement(DOMElement $encryptedData, XMLSecurityKey $inputKey)
 {
     $enc = new XMLSecEnc();
     $enc->setNode($encryptedData);
     $enc->type = $encryptedData->getAttribute("Type");
     $symmetricKey = $enc->locateKey($encryptedData);
     if (!$symmetricKey) {
         throw new Exception('Could not locate key algorithm in encrypted data.');
     }
     $symmetricKeyInfo = $enc->locateKeyInfo($symmetricKey);
     if (!$symmetricKeyInfo) {
         throw new Exception('Could not locate <dsig:KeyInfo> for the encrypted key.');
     }
     $inputKeyAlgo = $inputKey->getAlgorith();
     if ($symmetricKeyInfo->isEncrypted) {
         $symKeyInfoAlgo = $symmetricKeyInfo->getAlgorith();
         if ($symKeyInfoAlgo === XMLSecurityKey::RSA_OAEP_MGF1P && $inputKeyAlgo === XMLSecurityKey::RSA_1_5) {
             $inputKeyAlgo = XMLSecurityKey::RSA_OAEP_MGF1P;
         }
         if ($inputKeyAlgo !== $symKeyInfoAlgo) {
             throw new Exception('Algorithm mismatch between input key and key used to encrypt ' . ' the symmetric key for the message. Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyInfoAlgo, true));
         }
         $encKey = $symmetricKeyInfo->encryptedCtx;
         $symmetricKeyInfo->key = $inputKey->key;
         $key = $encKey->decryptKey($symmetricKeyInfo);
         $symmetricKey->loadkey($key);
     } else {
         $symKeyAlgo = $symmetricKey->getAlgorith();
         if ($inputKeyAlgo !== $symKeyAlgo) {
             throw new Exception('Algorithm mismatch between input key and key in message. ' . 'Key was: ' . var_export($inputKeyAlgo, true) . '; message was: ' . var_export($symKeyAlgo, true));
         }
         $symmetricKey = $inputKey;
     }
     $decrypted = $enc->decryptNode($symmetricKey, false);
     $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>';
     $newDoc = new DOMDocument();
     $newDoc = self::loadXML($newDoc, $xml);
     if (!$newDoc) {
         throw new Exception('Failed to parse decrypted XML. Maybe the wrong sharedkey was used?');
     }
     $decryptedElement = $newDoc->firstChild->firstChild;
     if ($decryptedElement === null) {
         throw new Exception('Missing encrypted element.');
     }
     return $decryptedElement;
 }

 /**
  * Decrypt an encrypted element.
  *
  * This is an internal helper function.
  *
  * @param  DOMElement     $encryptedData The encrypted data.
  * @param  XMLSecurityKey $inputKey      The decryption key.
  * @param  array          &$blacklist    Blacklisted decryption algorithms.
  * @return DOMElement     The decrypted element.
  * @throws Exception
  */
 private static function doDecryptElement(DOMElement $encryptedData, XMLSecurityKey $inputKey, array &$blacklist)
 {
     $enc = new XMLSecEnc();
     $enc->setNode($encryptedData);
     $enc->type = $encryptedData->getAttribute("Type");
     $symmetricKey = $enc->locateKey($encryptedData);
     if (!$symmetricKey) {
         throw new Exception('Could not locate key algorithm in encrypted data.');
     }
     $symmetricKeyInfo = $enc->locateKeyInfo($symmetricKey);
     if (!$symmetricKeyInfo) {
         throw new Exception('Could not locate <dsig:KeyInfo> for the encrypted key.');
     }
     $inputKeyAlgo = $inputKey->getAlgorith();
     if ($symmetricKeyInfo->isEncrypted) {
         $symKeyInfoAlgo = $symmetricKeyInfo->getAlgorith();
         if (in_array($symKeyInfoAlgo, $blacklist, TRUE)) {
             throw new Exception('Algorithm disabled: ' . var_export($symKeyInfoAlgo, TRUE));
         }
         if ($symKeyInfoAlgo === XMLSecurityKey::RSA_OAEP_MGF1P && $inputKeyAlgo === XMLSecurityKey::RSA_1_5) {
             /*
              * The RSA key formats are equal, so loading an RSA_1_5 key
              * into an RSA_OAEP_MGF1P key can be done without problems.
              * We therefore pretend that the input key is an
              * RSA_OAEP_MGF1P key.
              */
             $inputKeyAlgo = XMLSecurityKey::RSA_OAEP_MGF1P;
         }
         /* Make sure that the input key format is the same as the one used to encrypt the key. */
         if ($inputKeyAlgo !== $symKeyInfoAlgo) {
             throw new Exception('Algorithm mismatch between input key and key used to encrypt ' . ' the symmetric key for the message. Key was: ' . var_export($inputKeyAlgo, TRUE) . '; message was: ' . var_export($symKeyInfoAlgo, TRUE));
         }
         /** @var XMLSecEnc $encKey */
         $encKey = $symmetricKeyInfo->encryptedCtx;
         $symmetricKeyInfo->key = $inputKey->key;
         $keySize = $symmetricKey->getSymmetricKeySize();
         if ($keySize === NULL) {
             /* To protect against "key oracle" attacks, we need to be able to create a
              * symmetric key, and for that we need to know the key size.
              */
             throw new Exception('Unknown key size for encryption algorithm: ' . var_export($symmetricKey->type, TRUE));
         }
         try {
             $key = $encKey->decryptKey($symmetricKeyInfo);
             if (strlen($key) != $keySize) {
                 throw new Exception('Unexpected key size (' . strlen($key) * 8 . 'bits) for encryption algorithm: ' . var_export($symmetricKey->type, TRUE));
             }
         } catch (Exception $e) {
             /* We failed to decrypt this key. Log it, and substitute a "random" key. */
             SAML2_Utils::getContainer()->getLogger()->error('Failed to decrypt symmetric key: ' . $e->getMessage());
             /* Create a replacement key, so that it looks like we fail in the same way as if the key was correctly padded. */
             /* We base the symmetric key on the encrypted key and private key, so that we always behave the
              * same way for a given input key.
              */
             $encryptedKey = $encKey->getCipherValue();
             $pkey = openssl_pkey_get_details($symmetricKeyInfo->key);
             $pkey = sha1(serialize($pkey), TRUE);
             $key = sha1($encryptedKey . $pkey, TRUE);
             /* Make sure that the key has the correct length. */
             if (strlen($key) > $keySize) {
                 $key = substr($key, 0, $keySize);
             } elseif (strlen($key) < $keySize) {
                 $key = str_pad($key, $keySize);
             }
         }
         $symmetricKey->loadkey($key);
     } else {
         $symKeyAlgo = $symmetricKey->getAlgorith();
         /* Make sure that the input key has the correct format. */
         if ($inputKeyAlgo !== $symKeyAlgo) {
             throw new Exception('Algorithm mismatch between input key and key in message. ' . 'Key was: ' . var_export($inputKeyAlgo, TRUE) . '; message was: ' . var_export($symKeyAlgo, TRUE));
         }
         $symmetricKey = $inputKey;
     }
     $algorithm = $symmetricKey->getAlgorith();
     if (in_array($algorithm, $blacklist, TRUE)) {
         throw new Exception('Algorithm disabled: ' . var_export($algorithm, TRUE));
     }
     /** @var string $decrypted */
     $decrypted = $enc->decryptNode($symmetricKey, FALSE);
     /*
      * This is a workaround for the case where only a subset of the XML
      * tree was serialized for encryption. In that case, we may miss the
      * namespaces needed to parse the XML.
      */
     $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ' . 'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>';
     $newDoc = new DOMDocument();
     if (!@$newDoc->loadXML($xml)) {
         throw new Exception('Failed to parse decrypted XML. Maybe the wrong sharedkey was used?');
//.........这里部分代码省略.........

 /**
  * Decrypts the Assertion (DOMDocument)
  *
  * @param string $dom DomDocument
  *
  * @throws Exception
  * @return DOMDocument Decrypted Assertion
  */
 private function _decryptAssertion($dom)
 {
     $pem = $this->_settings->getSPkey();
     if (empty($pem)) {
         throw new Exception("No private key available, check settings");
     }
     $objenc = new XMLSecEnc();
     $encData = $objenc->locateEncryptedData($dom);
     if (!$encData) {
         throw new Exception("Cannot locate encrypted assertion");
     }
     $objenc->setNode($encData);
     $objenc->type = $encData->getAttribute("Type");
     if (!($objKey = $objenc->locateKey())) {
         throw new Exception("Unknown algorithm");
     }
     $key = null;
     if ($objKeyInfo = $objenc->locateKeyInfo($objKey)) {
         if ($objKeyInfo->isEncrypted) {
             $objencKey = $objKeyInfo->encryptedCtx;
             $objKeyInfo->loadKey($pem, false, false);
             $key = $objencKey->decryptKey($objKeyInfo);
         }
     }
     if (empty($objKey->key)) {
         $objKey->loadKey($key);
     }
     $decrypt = $objenc->decryptNode($objKey, true);
     if ($decrypt instanceof DOMDocument) {
         return $decrypt;
     } else {
         return $decrypt->ownerDocument;
     }
 }

 /**
  * Decrypt an encrypted element.
  *
  * @param DOMElement $encryptedData  The encrypted data.
  * @param XMLSecurityKey $inputKey  The decryption key.
  * @return DOMElement  The decrypted element.
  */
 public static function decryptElement(DOMElement $encryptedData, XMLSecurityKey $inputKey)
 {
     $enc = new XMLSecEnc();
     $enc->setNode($encryptedData);
     $enc->type = $encryptedData->getAttribute("Type");
     $symmetricKey = $enc->locateKey($encryptedData);
     if (!$symmetricKey) {
         throw new Exception('Could not locate key algorithm in encrypted data.');
     }
     $symmetricKeyInfo = $enc->locateKeyInfo($symmetricKey);
     if (!$symmetricKeyInfo) {
         throw new Exception('Could not locate <dsig:KeyInfo> for the encrypted key.');
     }
     $inputKeyAlgo = $inputKey->getAlgorith();
     if ($symmetricKeyInfo->isEncrypted) {
         $symKeyInfoAlgo = $symmetricKeyInfo->getAlgorith();
         if ($symKeyInfoAlgo === XMLSecurityKey::RSA_OAEP_MGF1P && $inputKeyAlgo === XMLSecurityKey::RSA_1_5) {
             /*
              * The RSA key formats are equal, so loading an RSA_1_5 key
              * into an RSA_OAEP_MGF1P key can be done without problems.
              * We therefore pretend that the input key is an
              * RSA_OAEP_MGF1P key.
              */
             $inputKeyAlgo = XMLSecurityKey::RSA_OAEP_MGF1P;
         }
         /* Make sure that the input key format is the same as the one used to encrypt the key. */
         if ($inputKeyAlgo !== $symKeyInfoAlgo) {
             throw new Exception('Algorithm mismatch between input key and key used to encrypt ' . ' the symmetric key for the message. Key was: ' . var_export($inputKeyAlgo, TRUE) . '; message was: ' . var_export($symKeyInfoAlgo, TRUE));
         }
         $encKey = $symmetricKeyInfo->encryptedCtx;
         $symmetricKeyInfo->key = $inputKey->key;
         $key = $encKey->decryptKey($symmetricKeyInfo);
         $symmetricKey->loadkey($key);
     } else {
         $symKeyAlgo = $symmetricKey->getAlgorith();
         /* Make sure that the input key has the correct format. */
         if ($inputKeyAlgo !== $symKeyAlgo) {
             throw new Exception('Algorithm mismatch between input key and key in message. ' . 'Key was: ' . var_export($inputKeyAlgo, TRUE) . '; message was: ' . var_export($symKeyAlgo, TRUE));
         }
         $symmetricKey = $inputKey;
     }
     $decrypted = $enc->decryptNode($symmetricKey, FALSE);
     /*
      * This is a workaround for the case where only a subset of the XML
      * tree was serialized for encryption. In that case, we may miss the
      * namespaces needed to parse the XML.
      */
     $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>';
     $newDoc = new DOMDocument();
     if (!$newDoc->loadXML($xml)) {
         throw new Exception('Failed to parse decrypted XML. Maybe the wrong sharedkey was used?');
     }
     $decryptedElement = $newDoc->firstChild->firstChild;
     if ($decryptedElement === NULL) {
         throw new Exception('Missing encrypted element.');
     }
     return $decryptedElement;
 }

 /**
  * This function decrypts the Assertion in the AuthnResponse
  * It throws an exception if the encryptAssertion for the remote idp is true and
  * the assertion is not encrypted
  * To Do: handle multible assertions
  */
 private function decryptAssertion()
 {
     $dom = $this->getDOM();
     $encryptedassertion = $this->doXPathQuery('/samlp:Response/saml:EncryptedAssertion')->item(0);
     $objenc = new XMLSecEnc();
     $encData = $objenc->locateEncryptedData($dom);
     if ($encData) {
         $spmd = $this->metadata->getMetaDataCurrent('saml20-sp-hosted');
         $spid = $this->metadata->getMetaDataCurrentEntityID('saml20-sp-hosted');
         $objenc->setNode($encData);
         $objenc->type = $encData->getAttribute("Type");
         $key = NULL;
         $objKey = $objenc->locateKey($encData);
         if ($objKey) {
             if ($objKeyInfo = $objenc->locateKeyInfo($objKey)) {
                 if ($objKeyInfo->isEncrypted) {
                     $objencKey = $objKeyInfo->encryptedCtx;
                     if (empty($spmd['privatekey'])) {
                         throw new Exception("SAML: RSA private key not configured. This is required to decrypt the response. saml20-sp-hosted: {$spid}");
                     }
                     $objKeyInfo->loadKey($spmd['privatekey']);
                     $key = $objencKey->decryptKey($objKeyInfo);
                 } else {
                     $idpmd = $this->metadata->getMetaData($this->issuer, 'saml20-idp-remote');
                     if (!isset($idpmd['sharedkey'])) {
                         throw new Exception("Shared key for decrypting assertion needed, but not specified for saml20-idp-remote id: " . $this->issuer);
                     }
                     $key = $idpmd['sharedkey'];
                 }
             }
         }
         if (empty($objKey) || empty($key)) {
             throw new Exception("Error loading key to handle Decryption: >" . var_export($objKey, true));
         }
         $objKey->loadkey($key);
         $decrypted = $objenc->decryptNode($objKey, false);
         $newdoc = new DOMDocument();
         $newdoc->loadXML('<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">' . $decrypted . '</root>');
         $importEnc = $encData->ownerDocument->importNode($newdoc->documentElement->firstChild, TRUE);
         $encryptedassertion->parentNode->replaceChild($importEnc, $encryptedassertion);
     } else {
         $md = $this->metadata->getMetaData($this->issuer, 'saml20-idp-remote');
         if (isset($md['assertion.encryption']) && $md['assertion.encryption']) {
             throw new Exception('Received unencrypted assertion from [' . $this->issuer . '] contrary to its metadata attribute [assertion.encryption]: ' . $md['assertion.encryption']);
         }
     }
 }

 /**
  * Decrypts the Assertion (DOMDocument)
  *
  * @param DomNode $dom DomDocument
  *
  * @return DOMDocument Decrypted Assertion
  *
  * @throws Exception
  */
 protected function _decryptAssertion($dom)
 {
     $pem = $this->_settings->getSPkey();
     if (empty($pem)) {
         throw new Exception("No private key available, check settings");
     }
     $objenc = new XMLSecEnc();
     $encData = $objenc->locateEncryptedData($dom);
     if (!$encData) {
         throw new Exception("Cannot locate encrypted assertion");
     }
     $objenc->setNode($encData);
     $objenc->type = $encData->getAttribute("Type");
     if (!($objKey = $objenc->locateKey())) {
         throw new Exception("Unknown algorithm");
     }
     $key = null;
     if ($objKeyInfo = $objenc->locateKeyInfo($objKey)) {
         if ($objKeyInfo->isEncrypted) {
             $objencKey = $objKeyInfo->encryptedCtx;
             $objKeyInfo->loadKey($pem, false, false);
             $key = $objencKey->decryptKey($objKeyInfo);
         } else {
             // symmetric encryption key support
             $objKeyInfo->loadKey($pem, false, false);
         }
     }
     if (empty($objKey->key)) {
         $objKey->loadKey($key);
     }
     $decrypted = $objenc->decryptNode($objKey, true);
     if ($decrypted instanceof DOMDocument) {
         return $decrypted;
     } else {
         $encryptedAssertion = $decrypted->parentNode;
         $container = $encryptedAssertion->parentNode;
         # Fix possible issue with saml namespace
         if (!$decrypted->hasAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:saml') && !$decrypted->hasAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:saml2') && !$decrypted->hasAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns') && !$container->hasAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:saml') && !$container->hasAttributeNS('http://www.w3.org/2000/xmlns/', 'xmlns:saml2')) {
             if (strpos($encryptedAssertion->tagName, 'saml2:') !== false) {
                 $ns = 'xmlns:saml2';
             } else {
                 if (strpos($encryptedAssertion->tagName, 'saml:') != false) {
                     $ns = 'xmlns:saml';
                 } else {
                     $ns = 'xmlns';
                 }
             }
             $decrypted->setAttributeNS('http://www.w3.org/2000/xmlns/', $ns, OneLogin_Saml2_Constants::NS_SAML);
         }
         $container->replaceChild($decrypted, $encryptedAssertion);
         return $decrypted->ownerDocument;
     }
 }

 /**
  *
  * @@dataProvider decryptFilesProvider
  * @throws \Exception
  */
 public function testDecrypt($testName, $testFile, $privKey)
 {
     $doc = new \DOMDocument();
     $output = null;
     $doc->load($testFile);
     $objenc = new XMLSecEnc();
     $encData = $objenc->locateEncryptedData($doc);
     $this->assertInstanceOf('\\DOMElement', $encData, "Cannot locate Encrypted Data");
     $objenc->setNode($encData);
     $objenc->type = $encData->getAttribute("Type");
     $objKey = $objenc->locateKey();
     $this->assertInstanceOf('\\XmlSecLibs\\XMLSecurityKey', $objKey, "We know the secret key, but not the algorithm");
     $key = null;
     if ($objKeyInfo = $objenc->locateKeyInfo($objKey)) {
         if ($objKeyInfo->isEncrypted) {
             $objencKey = $objKeyInfo->encryptedCtx;
             $objKeyInfo->loadKey($privKey, true);
             $key = $objencKey->decryptKey($objKeyInfo);
         }
     }
     if (!$objKey->key && empty($key)) {
         $objKeyInfo->loadKey($privKey, true);
     }
     if (empty($objKey->key)) {
         $objKey->loadKey($key);
     }
     $token = null;
     if ($decrypt = $objenc->decryptNode($objKey, true)) {
         $output = null;
         if ($decrypt instanceof \DOMNode) {
             if ($decrypt instanceof \DOMDocument) {
                 $output = $decrypt->saveXML();
             } else {
                 $output = $decrypt->ownerDocument->saveXML();
             }
         } else {
             $output = $decrypt;
         }
     }
     $outfile = dirname(__FILE__) . "/../basic-doc.xml";
     $res = null;
     $this->assertFileExists($outfile);
     $resDoc = new \DOMDocument();
     $resDoc->load($outfile);
     $res = $resDoc->saveXML();
     $this->assertEquals($res, $output, "{$testName} Failed to decrypt {$testFile}");
 }