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<?php
namespace RobRichards\XMLSecLibs;
use DOMDocument;
use DOMElement;
use DOMNode;
use DOMXPath;
use Exception;
use RobRichards\XMLSecLibs\Utils\XPath as XPath;
/**
* xmlseclibs.php
*
* Copyright (c) 2007-2020, Robert Richards <[email protected]>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of Robert Richards nor the names of his
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
* @author Robert Richards <[email protected]>
* @copyright 2007-2020 Robert Richards <[email protected]>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
class XMLSecEnc
{
const template = "<xenc:EncryptedData xmlns:xenc='http://www.w3.org/2001/04/xmlenc#'>
<xenc:CipherData>
<xenc:CipherValue></xenc:CipherValue>
</xenc:CipherData>
</xenc:EncryptedData>";
const Element = 'http://www.w3.org/2001/04/xmlenc#Element';
const Content = 'http://www.w3.org/2001/04/xmlenc#Content';
const URI = 3;
const XMLENCNS = 'http://www.w3.org/2001/04/xmlenc#';
/** @var null|DOMDocument */
private $encdoc = null;
/** @var null|DOMNode */
private $rawNode = null;
/** @var null|string */
public $type = null;
/** @var null|DOMElement */
public $encKey = null;
/** @var array */
private $references = array();
public function __construct()
{
$this->_resetTemplate();
}
private function _resetTemplate()
{
$this->encdoc = new DOMDocument();
$this->encdoc->loadXML(self::template);
}
/**
* @param string $name
* @param DOMNode $node
* @param string $type
* @throws Exception
*/
public function addReference($name, $node, $type)
{
if (! $node instanceOf DOMNode) {
throw new Exception('$node is not of type DOMNode');
}
$curencdoc = $this->encdoc;
$this->_resetTemplate();
$encdoc = $this->encdoc;
$this->encdoc = $curencdoc;
$refuri = XMLSecurityDSig::generateGUID();
$element = $encdoc->documentElement;
$element->setAttribute("Id", $refuri);
$this->references[$name] = array("node" => $node, "type" => $type, "encnode" => $encdoc, "refuri" => $refuri);
}
/**
* @param DOMNode $node
*/
public function setNode($node)
{
$this->rawNode = $node;
}
/**
* Encrypt the selected node with the given key.
*
* @param XMLSecurityKey $objKey The encryption key and algorithm.
* @param bool $replace Whether the encrypted node should be replaced in the original tree. Default is true.
* @throws Exception
*
* @return DOMElement The <xenc:EncryptedData>-element.
*/
public function encryptNode($objKey, $replace = true)
{
$data = '';
if (empty($this->rawNode)) {
throw new Exception('Node to encrypt has not been set');
}
if (! $objKey instanceof XMLSecurityKey) {
throw new Exception('Invalid Key');
}
$doc = $this->rawNode->ownerDocument;
$xPath = new DOMXPath($this->encdoc);
$objList = $xPath->query('/xenc:EncryptedData/xenc:CipherData/xenc:CipherValue');
$cipherValue = $objList->item(0);
if ($cipherValue == null) {
throw new Exception('Error locating CipherValue element within template');
}
switch ($this->type) {
case (self::Element):
$data = $doc->saveXML($this->rawNode);
$this->encdoc->documentElement->setAttribute('Type', self::Element);
break;
case (self::Content):
$children = $this->rawNode->childNodes;
foreach ($children AS $child) {
$data .= $doc->saveXML($child);
}
$this->encdoc->documentElement->setAttribute('Type', self::Content);
break;
default:
throw new Exception('Type is currently not supported');
}
$encMethod = $this->encdoc->documentElement->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:EncryptionMethod'));
$encMethod->setAttribute('Algorithm', $objKey->getAlgorithm());
$cipherValue->parentNode->parentNode->insertBefore($encMethod, $cipherValue->parentNode->parentNode->firstChild);
$strEncrypt = base64_encode($objKey->encryptData($data));
$value = $this->encdoc->createTextNode($strEncrypt);
$cipherValue->appendChild($value);
if ($replace) {
switch ($this->type) {
case (self::Element):
if ($this->rawNode->nodeType == XML_DOCUMENT_NODE) {
return $this->encdoc;
}
$importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, true);
$this->rawNode->parentNode->replaceChild($importEnc, $this->rawNode);
return $importEnc;
case (self::Content):
$importEnc = $this->rawNode->ownerDocument->importNode($this->encdoc->documentElement, true);
while ($this->rawNode->firstChild) {
$this->rawNode->removeChild($this->rawNode->firstChild);
}
$this->rawNode->appendChild($importEnc);
return $importEnc;
}
} else {
return $this->encdoc->documentElement;
}
}
/**
* @param XMLSecurityKey $objKey
* @throws Exception
*/
public function encryptReferences($objKey)
{
$curRawNode = $this->rawNode;
$curType = $this->type;
foreach ($this->references AS $name => $reference) {
$this->encdoc = $reference["encnode"];
$this->rawNode = $reference["node"];
$this->type = $reference["type"];
try {
$encNode = $this->encryptNode($objKey);
$this->references[$name]["encnode"] = $encNode;
} catch (Exception $e) {
$this->rawNode = $curRawNode;
$this->type = $curType;
throw $e;
}
}
$this->rawNode = $curRawNode;
$this->type = $curType;
}
/**
* Retrieve the CipherValue text from this encrypted node.
*
* @throws Exception
* @return string|null The Ciphervalue text, or null if no CipherValue is found.
*/
public function getCipherValue()
{
if (empty($this->rawNode)) {
throw new Exception('Node to decrypt has not been set');
}
$doc = $this->rawNode->ownerDocument;
$xPath = new DOMXPath($doc);
$xPath->registerNamespace('xmlencr', self::XMLENCNS);
/* Only handles embedded content right now and not a reference */
$query = "./xmlencr:CipherData/xmlencr:CipherValue";
$nodeset = $xPath->query($query, $this->rawNode);
$node = $nodeset->item(0);
if (!$node) {
return null;
}
return base64_decode($node->nodeValue);
}
/**
* Decrypt this encrypted node.
*
* The behaviour of this function depends on the value of $replace.
* If $replace is false, we will return the decrypted data as a string.
* If $replace is true, we will insert the decrypted element(s) into the
* document, and return the decrypted element(s).
*
* @param XMLSecurityKey $objKey The decryption key that should be used when decrypting the node.
* @param boolean $replace Whether we should replace the encrypted node in the XML document with the decrypted data. The default is true.
*
* @return string|DOMElement The decrypted data.
*/
public function decryptNode($objKey, $replace=true)
{
if (! $objKey instanceof XMLSecurityKey) {
throw new Exception('Invalid Key');
}
$encryptedData = $this->getCipherValue();
if ($encryptedData) {
$decrypted = $objKey->decryptData($encryptedData);
if ($replace) {
switch ($this->type) {
case (self::Element):
$newdoc = new DOMDocument();
$newdoc->loadXML($decrypted);
if ($this->rawNode->nodeType == XML_DOCUMENT_NODE) {
return $newdoc;
}
$importEnc = $this->rawNode->ownerDocument->importNode($newdoc->documentElement, true);
$this->rawNode->parentNode->replaceChild($importEnc, $this->rawNode);
return $importEnc;
case (self::Content):
if ($this->rawNode->nodeType == XML_DOCUMENT_NODE) {
$doc = $this->rawNode;
} else {
$doc = $this->rawNode->ownerDocument;
}
$newFrag = $doc->createDocumentFragment();
$newFrag->appendXML($decrypted);
$parent = $this->rawNode->parentNode;
$parent->replaceChild($newFrag, $this->rawNode);
return $parent;
default:
return $decrypted;
}
} else {
return $decrypted;
}
} else {
throw new Exception("Cannot locate encrypted data");
}
}
/**
* Encrypt the XMLSecurityKey
*
* @param XMLSecurityKey $srcKey
* @param XMLSecurityKey $rawKey
* @param bool $append
* @throws Exception
*/
public function encryptKey($srcKey, $rawKey, $append=true)
{
if ((! $srcKey instanceof XMLSecurityKey) || (! $rawKey instanceof XMLSecurityKey)) {
throw new Exception('Invalid Key');
}
$strEncKey = base64_encode($srcKey->encryptData($rawKey->key));
$root = $this->encdoc->documentElement;
$encKey = $this->encdoc->createElementNS(self::XMLENCNS, 'xenc:EncryptedKey');
if ($append) {
$keyInfo = $root->insertBefore($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyInfo'), $root->firstChild);
$keyInfo->appendChild($encKey);
} else {
$this->encKey = $encKey;
}
$encMethod = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:EncryptionMethod'));
$encMethod->setAttribute('Algorithm', $srcKey->getAlgorith());
if (! empty($srcKey->name)) {
$keyInfo = $encKey->appendChild($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyInfo'));
$keyInfo->appendChild($this->encdoc->createElementNS('http://www.w3.org/2000/09/xmldsig#', 'dsig:KeyName', $srcKey->name));
}
$cipherData = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:CipherData'));
$cipherData->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:CipherValue', $strEncKey));
if (is_array($this->references) && count($this->references) > 0) {
$refList = $encKey->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:ReferenceList'));
foreach ($this->references AS $name => $reference) {
$refuri = $reference["refuri"];
$dataRef = $refList->appendChild($this->encdoc->createElementNS(self::XMLENCNS, 'xenc:DataReference'));
$dataRef->setAttribute("URI", '#' . $refuri);
}
}
return;
}
/**
* @param XMLSecurityKey $encKey
* @return DOMElement|string
* @throws Exception
*/
public function decryptKey($encKey)
{
if (! $encKey->isEncrypted) {
throw new Exception("Key is not Encrypted");
}
if (empty($encKey->key)) {
throw new Exception("Key is missing data to perform the decryption");
}
return $this->decryptNode($encKey, false);
}
/**
* @param DOMDocument $element
* @return DOMNode|null
*/
public function locateEncryptedData($element)
{
if ($element instanceof DOMDocument) {
$doc = $element;
} else {
$doc = $element->ownerDocument;
}
if ($doc) {
$xpath = new DOMXPath($doc);
$query = "//*[local-name()='EncryptedData' and namespace-uri()='".self::XMLENCNS."']";
$nodeset = $xpath->query($query);
return $nodeset->item(0);
}
return null;
}
/**
* Returns the key from the DOM
* @param null|DOMNode $node
* @return null|XMLSecurityKey
*/
public function locateKey($node=null)
{
if (empty($node)) {
$node = $this->rawNode;
}
if (! $node instanceof DOMNode) {
return null;
}
if ($doc = $node->ownerDocument) {
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('xmlsecenc', self::XMLENCNS);
$query = ".//xmlsecenc:EncryptionMethod";
$nodeset = $xpath->query($query, $node);
if ($encmeth = $nodeset->item(0)) {
$attrAlgorithm = $encmeth->getAttribute("Algorithm");
try {
$objKey = new XMLSecurityKey($attrAlgorithm, array('type' => 'private'));
} catch (Exception $e) {
return null;
}
return $objKey;
}
}
return null;
}
/**
* @param null|XMLSecurityKey $objBaseKey
* @param null|DOMNode $node
* @return null|XMLSecurityKey
* @throws Exception
*/
public static function staticLocateKeyInfo($objBaseKey=null, $node=null)
{
if (empty($node) || (! $node instanceof DOMNode)) {
return null;
}
$doc = $node->ownerDocument;
if (!$doc) {
return null;
}
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('xmlsecenc', self::XMLENCNS);
$xpath->registerNamespace('xmlsecdsig', XMLSecurityDSig::XMLDSIGNS);
$query = "./xmlsecdsig:KeyInfo";
$nodeset = $xpath->query($query, $node);
$encmeth = $nodeset->item(0);
if (!$encmeth) {
/* No KeyInfo in EncryptedData / EncryptedKey. */
return $objBaseKey;
}
foreach ($encmeth->childNodes AS $child) {
switch ($child->localName) {
case 'KeyName':
if (! empty($objBaseKey)) {
$objBaseKey->name = $child->nodeValue;
}
break;
case 'KeyValue':
foreach ($child->childNodes AS $keyval) {
switch ($keyval->localName) {
case 'DSAKeyValue':
throw new Exception("DSAKeyValue currently not supported");
case 'RSAKeyValue':
$modulus = null;
$exponent = null;
if ($modulusNode = $keyval->getElementsByTagName('Modulus')->item(0)) {
$modulus = base64_decode($modulusNode->nodeValue);
}
if ($exponentNode = $keyval->getElementsByTagName('Exponent')->item(0)) {
$exponent = base64_decode($exponentNode->nodeValue);
}
if (empty($modulus) || empty($exponent)) {
throw new Exception("Missing Modulus or Exponent");
}
$publicKey = XMLSecurityKey::convertRSA($modulus, $exponent);
$objBaseKey->loadKey($publicKey);
break;
}
}
break;
case 'RetrievalMethod':
$type = $child->getAttribute('Type');
if ($type !== 'http://www.w3.org/2001/04/xmlenc#EncryptedKey') {
/* Unsupported key type. */
break;
}
$uri = $child->getAttribute('URI');
if ($uri[0] !== '#') {
/* URI not a reference - unsupported. */
break;
}
$id = substr($uri, 1);
$query = '//xmlsecenc:EncryptedKey[@Id="'.XPath::filterAttrValue($id, XPath::DOUBLE_QUOTE).'"]';
$keyElement = $xpath->query($query)->item(0);
if (!$keyElement) {
throw new Exception("Unable to locate EncryptedKey with @Id='$id'.");
}
return XMLSecurityKey::fromEncryptedKeyElement($keyElement);
case 'EncryptedKey':
return XMLSecurityKey::fromEncryptedKeyElement($child);
case 'X509Data':
if ($x509certNodes = $child->getElementsByTagName('X509Certificate')) {
if ($x509certNodes->length > 0) {
$x509cert = $x509certNodes->item(0)->textContent;
$x509cert = str_replace(array("\r", "\n", " "), "", $x509cert);
$x509cert = "-----BEGIN CERTIFICATE-----\n".chunk_split($x509cert, 64, "\n")."-----END CERTIFICATE-----\n";
$objBaseKey->loadKey($x509cert, false, true);
}
}
break;
}
}
return $objBaseKey;
}
/**
* @param null|XMLSecurityKey $objBaseKey
* @param null|DOMNode $node
* @return null|XMLSecurityKey
*/
public function locateKeyInfo($objBaseKey=null, $node=null)
{
if (empty($node)) {
$node = $this->rawNode;
}
return self::staticLocateKeyInfo($objBaseKey, $node);
}
}