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XMLSecurityDSig.php
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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) 2007-2024, Robert Richards <rrichards@cdatazone.org>.
* 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 <rrichards@cdatazone.org>
* @copyright 2007-2024 Robert Richards <rrichards@cdatazone.org>
* @license http://www.opensource.org/licenses/bsd-license.php BSD License
*/
class XMLSecurityDSig
{
const XMLDSIGNS = 'http://www.w3.org/2000/09/xmldsig#';
const SHA1 = 'http://www.w3.org/2000/09/xmldsig#sha1';
const SHA256 = 'http://www.w3.org/2001/04/xmlenc#sha256';
const SHA384 = 'http://www.w3.org/2001/04/xmldsig-more#sha384';
const SHA512 = 'http://www.w3.org/2001/04/xmlenc#sha512';
const RIPEMD160 = 'http://www.w3.org/2001/04/xmlenc#ripemd160';
const C14N = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
const C14N_COMMENTS = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments';
const EXC_C14N = 'http://www.w3.org/2001/10/xml-exc-c14n#';
const EXC_C14N_COMMENTS = 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments';
const template = '<ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
<ds:SignedInfo>
<ds:SignatureMethod />
</ds:SignedInfo>
</ds:Signature>';
const BASE_TEMPLATE = '<Signature xmlns="http://www.w3.org/2000/09/xmldsig#">
<SignedInfo>
<SignatureMethod />
</SignedInfo>
</Signature>';
/** @var DOMElement|null */
public $sigNode = null;
/** @var array */
public $idKeys = array();
/** @var array */
public $idNS = array();
/** @var string|null */
private $signedInfo = null;
/** @var DomXPath|null */
private $xPathCtx = null;
/** @var string|null */
private $canonicalMethod = null;
/** @var string */
private $prefix = '';
/** @var string */
private $searchpfx = 'secdsig';
/**
* This variable contains an associative array of validated nodes.
* @var array|null
*/
private $validatedNodes = null;
/**
* @param string $prefix
*/
public function __construct($prefix='ds')
{
$template = self::BASE_TEMPLATE;
if (! empty($prefix)) {
$this->prefix = $prefix.':';
$search = array("<S", "</S", "xmlns=");
$replace = array("<$prefix:S", "</$prefix:S", "xmlns:$prefix=");
$template = str_replace($search, $replace, $template);
}
$sigdoc = new DOMDocument();
$sigdoc->loadXML($template);
$this->sigNode = $sigdoc->documentElement;
}
/**
* Reset the XPathObj to null
*/
private function resetXPathObj()
{
$this->xPathCtx = null;
}
/**
* Returns the XPathObj or null if xPathCtx is set and sigNode is empty.
*
* @return DOMXPath|null
*/
private function getXPathObj()
{
if (empty($this->xPathCtx) && ! empty($this->sigNode)) {
$xpath = new DOMXPath($this->sigNode->ownerDocument);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$this->xPathCtx = $xpath;
}
return $this->xPathCtx;
}
/**
* Generate guid
*
* @param string $prefix Prefix to use for guid. defaults to pfx
*
* @return string The generated guid
*/
public static function generateGUID($prefix='pfx')
{
$uuid = md5(uniqid(mt_rand(), true));
$guid = $prefix.substr($uuid, 0, 8)."-".
substr($uuid, 8, 4)."-".
substr($uuid, 12, 4)."-".
substr($uuid, 16, 4)."-".
substr($uuid, 20, 12);
return $guid;
}
/**
* Generate guid
*
* @param string $prefix Prefix to use for guid. defaults to pfx
*
* @return string The generated guid
*
* @deprecated Method deprecated in Release 1.4.1
*/
public static function generate_GUID($prefix='pfx')
{
return self::generateGUID($prefix);
}
/**
* @param DOMDocument $objDoc
* @param int $pos
* @return DOMNode|null
*/
public function locateSignature($objDoc, $pos=0)
{
if ($objDoc instanceof DOMDocument) {
$doc = $objDoc;
} else {
$doc = $objDoc->ownerDocument;
}
if ($doc) {
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$query = ".//secdsig:Signature";
$nodeset = $xpath->query($query, $objDoc);
$this->sigNode = $nodeset->item($pos);
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($nodeset->length > 1) {
throw new Exception("Invalid structure - Too many SignedInfo elements found");
}
return $this->sigNode;
}
return null;
}
/**
* @param string $name
* @param null|string $value
* @return DOMElement
*/
public function createNewSignNode($name, $value=null)
{
$doc = $this->sigNode->ownerDocument;
if (! is_null($value)) {
$node = $doc->createElementNS(self::XMLDSIGNS, $this->prefix.$name, $value);
} else {
$node = $doc->createElementNS(self::XMLDSIGNS, $this->prefix.$name);
}
return $node;
}
/**
* @param string $method
* @throws Exception
*/
public function setCanonicalMethod($method)
{
switch ($method) {
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
$this->canonicalMethod = $method;
break;
default:
throw new Exception('Invalid Canonical Method');
}
if ($xpath = $this->getXPathObj()) {
$query = './'.$this->searchpfx.':SignedInfo';
$nodeset = $xpath->query($query, $this->sigNode);
if ($sinfo = $nodeset->item(0)) {
$query = './'.$this->searchpfx.'CanonicalizationMethod';
$nodeset = $xpath->query($query, $sinfo);
if (! ($canonNode = $nodeset->item(0))) {
$canonNode = $this->createNewSignNode('CanonicalizationMethod');
$sinfo->insertBefore($canonNode, $sinfo->firstChild);
}
$canonNode->setAttribute('Algorithm', $this->canonicalMethod);
}
}
}
/**
* @param DOMNode $node
* @param string $canonicalmethod
* @param null|array $arXPath
* @param null|array $prefixList
* @return string
*/
private function canonicalizeData($node, $canonicalmethod, $arXPath=null, $prefixList=null)
{
$exclusive = false;
$withComments = false;
switch ($canonicalmethod) {
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
$exclusive = false;
$withComments = false;
break;
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
$withComments = true;
break;
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
$exclusive = true;
break;
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
$exclusive = true;
$withComments = true;
break;
}
if (is_null($arXPath) && ($node instanceof DOMNode) && ($node->ownerDocument !== null) && $node->isSameNode($node->ownerDocument->documentElement)) {
/* Check for any PI or comments as they would have been excluded */
$element = $node;
while ($refnode = $element->previousSibling) {
if ($refnode->nodeType == XML_PI_NODE || (($refnode->nodeType == XML_COMMENT_NODE) && $withComments)) {
break;
}
$element = $refnode;
}
if ($refnode == null) {
$node = $node->ownerDocument;
}
}
return $node->C14N($exclusive, $withComments, $arXPath, $prefixList);
}
/**
* @return null|string
*/
public function canonicalizeSignedInfo()
{
$doc = $this->sigNode->ownerDocument;
$canonicalmethod = null;
if ($doc) {
$xpath = $this->getXPathObj();
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($nodeset->length > 1) {
throw new Exception("Invalid structure - Too many SignedInfo elements found");
}
if ($signInfoNode = $nodeset->item(0)) {
$query = "./secdsig:CanonicalizationMethod";
$nodeset = $xpath->query($query, $signInfoNode);
$prefixList = null;
if ($canonNode = $nodeset->item(0)) {
$canonicalmethod = $canonNode->getAttribute('Algorithm');
foreach ($canonNode->childNodes as $node)
{
if ($node->localName == 'InclusiveNamespaces') {
if ($pfx = $node->getAttribute('PrefixList')) {
$arpfx = array_filter(explode(' ', $pfx));
if (count($arpfx) > 0) {
$prefixList = array_merge($prefixList ? $prefixList : array(), $arpfx);
}
}
}
}
}
$this->signedInfo = $this->canonicalizeData($signInfoNode, $canonicalmethod, null, $prefixList);
return $this->signedInfo;
}
}
return null;
}
/**
* @param string $digestAlgorithm
* @param string $data
* @param bool $encode
* @return string
* @throws Exception
*/
public function calculateDigest($digestAlgorithm, $data, $encode = true)
{
switch ($digestAlgorithm) {
case self::SHA1:
$alg = 'sha1';
break;
case self::SHA256:
$alg = 'sha256';
break;
case self::SHA384:
$alg = 'sha384';
break;
case self::SHA512:
$alg = 'sha512';
break;
case self::RIPEMD160:
$alg = 'ripemd160';
break;
default:
throw new Exception("Cannot validate digest: Unsupported Algorithm <$digestAlgorithm>");
}
$digest = hash($alg, $data, true);
if ($encode) {
$digest = base64_encode($digest);
}
return $digest;
}
/**
* @param $refNode
* @param string $data
* @return bool
*/
public function validateDigest($refNode, $data)
{
$xpath = new DOMXPath($refNode->ownerDocument);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$query = 'string(./secdsig:DigestMethod/@Algorithm)';
$digestAlgorithm = $xpath->evaluate($query, $refNode);
$digValue = $this->calculateDigest($digestAlgorithm, $data, false);
$query = 'string(./secdsig:DigestValue)';
$digestValue = $xpath->evaluate($query, $refNode);
return ($digValue === base64_decode($digestValue));
}
/**
* @param $refNode
* @param DOMNode $objData
* @param bool $includeCommentNodes
* @return string
*/
public function processTransforms($refNode, $objData, $includeCommentNodes = true)
{
$data = $objData;
$xpath = new DOMXPath($refNode->ownerDocument);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$query = './secdsig:Transforms/secdsig:Transform';
$nodelist = $xpath->query($query, $refNode);
$canonicalMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
$arXPath = null;
$prefixList = null;
foreach ($nodelist AS $transform) {
$algorithm = $transform->getAttribute("Algorithm");
switch ($algorithm) {
case 'http://www.w3.org/2001/10/xml-exc-c14n#':
case 'http://www.w3.org/2001/10/xml-exc-c14n#WithComments':
if (!$includeCommentNodes) {
/* We remove comment nodes by forcing it to use a canonicalization
* without comments.
*/
$canonicalMethod = 'http://www.w3.org/2001/10/xml-exc-c14n#';
} else {
$canonicalMethod = $algorithm;
}
$node = $transform->firstChild;
while ($node) {
if ($node->localName == 'InclusiveNamespaces') {
if ($pfx = $node->getAttribute('PrefixList')) {
$arpfx = array();
$pfxlist = explode(" ", $pfx);
foreach ($pfxlist AS $pfx) {
$val = trim($pfx);
if (! empty($val)) {
$arpfx[] = $val;
}
}
if (count($arpfx) > 0) {
$prefixList = $arpfx;
}
}
break;
}
$node = $node->nextSibling;
}
break;
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315':
case 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315#WithComments':
if (!$includeCommentNodes) {
/* We remove comment nodes by forcing it to use a canonicalization
* without comments.
*/
$canonicalMethod = 'http://www.w3.org/TR/2001/REC-xml-c14n-20010315';
} else {
$canonicalMethod = $algorithm;
}
break;
case 'http://www.w3.org/TR/1999/REC-xpath-19991116':
$node = $transform->firstChild;
while ($node) {
if ($node->localName == 'XPath') {
$arXPath = array();
$arXPath['query'] = '(.//. | .//@* | .//namespace::*)['.$node->nodeValue.']';
$arXPath['namespaces'] = array();
$nslist = $xpath->query('./namespace::*', $node);
foreach ($nslist AS $nsnode) {
if ($nsnode->localName != "xml") {
$arXPath['namespaces'][$nsnode->localName] = $nsnode->nodeValue;
}
}
break;
}
$node = $node->nextSibling;
}
break;
}
}
if ($data instanceof DOMNode) {
$data = $this->canonicalizeData($objData, $canonicalMethod, $arXPath, $prefixList);
}
return $data;
}
/**
* @param DOMNode $refNode
* @return bool
*/
public function processRefNode($refNode)
{
$dataObject = null;
/*
* Depending on the URI, we may not want to include comments in the result
* See: http://www.w3.org/TR/xmldsig-core/#sec-ReferenceProcessingModel
*/
$includeCommentNodes = true;
if ($uri = $refNode->getAttribute("URI")) {
$arUrl = parse_url($uri);
if (empty($arUrl['path'])) {
if ($identifier = $arUrl['fragment']) {
/* This reference identifies a node with the given id by using
* a URI on the form "#identifier". This should not include comments.
*/
$includeCommentNodes = false;
$xPath = new DOMXPath($refNode->ownerDocument);
if ($this->idNS && is_array($this->idNS)) {
foreach ($this->idNS as $nspf => $ns) {
$xPath->registerNamespace($nspf, $ns);
}
}
$iDlist = '@Id="'.XPath::filterAttrValue($identifier, XPath::DOUBLE_QUOTE).'"';
if (is_array($this->idKeys)) {
foreach ($this->idKeys as $idKey) {
$iDlist .= " or @".XPath::filterAttrName($idKey).'="'.
XPath::filterAttrValue($identifier, XPath::DOUBLE_QUOTE).'"';
}
}
$query = '//*['.$iDlist.']';
$dataObject = $xPath->query($query)->item(0);
} else {
$dataObject = $refNode->ownerDocument;
}
}
} else {
/* This reference identifies the root node with an empty URI. This should
* not include comments.
*/
$includeCommentNodes = false;
$dataObject = $refNode->ownerDocument;
}
$data = $this->processTransforms($refNode, $dataObject, $includeCommentNodes);
if (!$this->validateDigest($refNode, $data)) {
return false;
}
if ($dataObject instanceof DOMNode) {
/* Add this node to the list of validated nodes. */
if (! empty($identifier)) {
$this->validatedNodes[$identifier] = $dataObject;
} else {
$this->validatedNodes[] = $dataObject;
}
}
return true;
}
/**
* @param DOMNode $refNode
* @return null
*/
public function getRefNodeID($refNode)
{
if ($uri = $refNode->getAttribute("URI")) {
$arUrl = parse_url($uri);
if (empty($arUrl['path'])) {
if ($identifier = $arUrl['fragment']) {
return $identifier;
}
}
}
return null;
}
/**
* @return array
* @throws Exception
*/
public function getRefIDs()
{
$refids = array();
$xpath = $this->getXPathObj();
$query = "./secdsig:SignedInfo[1]/secdsig:Reference";
$nodeset = $xpath->query($query, $this->sigNode);
if ($nodeset->length == 0) {
throw new Exception("Reference nodes not found");
}
foreach ($nodeset AS $refNode) {
$refids[] = $this->getRefNodeID($refNode);
}
return $refids;
}
/**
* @return bool
* @throws Exception
*/
public function validateReference()
{
$docElem = $this->sigNode->ownerDocument->documentElement;
if (! $docElem->isSameNode($this->sigNode)) {
if ($this->sigNode->parentNode != null) {
$this->sigNode->parentNode->removeChild($this->sigNode);
}
}
$xpath = $this->getXPathObj();
$query = "./secdsig:SignedInfo[1]/secdsig:Reference";
$nodeset = $xpath->query($query, $this->sigNode);
if ($nodeset->length == 0) {
throw new Exception("Reference nodes not found");
}
/* Initialize/reset the list of validated nodes. */
$this->validatedNodes = array();
foreach ($nodeset AS $refNode) {
if (! $this->processRefNode($refNode)) {
/* Clear the list of validated nodes. */
$this->validatedNodes = null;
throw new Exception("Reference validation failed");
}
}
return true;
}
/**
* @param DOMNode $sinfoNode
* @param DOMDocument $node
* @param string $algorithm
* @param null|array $arTransforms
* @param null|array $options
*/
private function addRefInternal($sinfoNode, $node, $algorithm, $arTransforms=null, $options=null)
{
$prefix = null;
$prefix_ns = null;
$id_name = 'Id';
$overwrite_id = true;
$force_uri = false;
if (is_array($options)) {
$prefix = empty($options['prefix']) ? null : $options['prefix'];
$prefix_ns = empty($options['prefix_ns']) ? null : $options['prefix_ns'];
$id_name = empty($options['id_name']) ? 'Id' : $options['id_name'];
$overwrite_id = !isset($options['overwrite']) ? true : (bool) $options['overwrite'];
$force_uri = !isset($options['force_uri']) ? false : (bool) $options['force_uri'];
}
$attname = $id_name;
if (! empty($prefix)) {
$attname = $prefix.':'.$attname;
}
$refNode = $this->createNewSignNode('Reference');
$sinfoNode->appendChild($refNode);
if (! $node instanceof DOMDocument) {
$uri = null;
if (! $overwrite_id) {
$uri = $prefix_ns ? $node->getAttributeNS($prefix_ns, $id_name) : $node->getAttribute($id_name);
}
if (empty($uri)) {
$uri = self::generateGUID();
$node->setAttributeNS($prefix_ns, $attname, $uri);
}
$refNode->setAttribute("URI", '#'.$uri);
} elseif ($force_uri) {
$refNode->setAttribute("URI", '');
}
$transNodes = $this->createNewSignNode('Transforms');
$refNode->appendChild($transNodes);
if (is_array($arTransforms)) {
foreach ($arTransforms AS $transform) {
$transNode = $this->createNewSignNode('Transform');
$transNodes->appendChild($transNode);
if (is_array($transform) &&
(! empty($transform['http://www.w3.org/TR/1999/REC-xpath-19991116'])) &&
(! empty($transform['http://www.w3.org/TR/1999/REC-xpath-19991116']['query']))) {
$transNode->setAttribute('Algorithm', 'http://www.w3.org/TR/1999/REC-xpath-19991116');
$XPathNode = $this->createNewSignNode('XPath', $transform['http://www.w3.org/TR/1999/REC-xpath-19991116']['query']);
$transNode->appendChild($XPathNode);
if (! empty($transform['http://www.w3.org/TR/1999/REC-xpath-19991116']['namespaces'])) {
foreach ($transform['http://www.w3.org/TR/1999/REC-xpath-19991116']['namespaces'] AS $prefix => $namespace) {
$XPathNode->setAttributeNS("http://www.w3.org/2000/xmlns/", "xmlns:$prefix", $namespace);
}
}
} else {
$transNode->setAttribute('Algorithm', $transform);
}
}
} elseif (! empty($this->canonicalMethod)) {
$transNode = $this->createNewSignNode('Transform');
$transNodes->appendChild($transNode);
$transNode->setAttribute('Algorithm', $this->canonicalMethod);
}
$canonicalData = $this->processTransforms($refNode, $node);
$digValue = $this->calculateDigest($algorithm, $canonicalData);
$digestMethod = $this->createNewSignNode('DigestMethod');
$refNode->appendChild($digestMethod);
$digestMethod->setAttribute('Algorithm', $algorithm);
$digestValue = $this->createNewSignNode('DigestValue', $digValue);
$refNode->appendChild($digestValue);
}
/**
* @param DOMDocument $node
* @param string $algorithm
* @param null|array $arTransforms
* @param null|array $options
*/
public function addReference($node, $algorithm, $arTransforms=null, $options=null)
{
if ($xpath = $this->getXPathObj()) {
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($sInfo = $nodeset->item(0)) {
$this->addRefInternal($sInfo, $node, $algorithm, $arTransforms, $options);
}
}
}
/**
* @param array $arNodes
* @param string $algorithm
* @param null|array $arTransforms
* @param null|array $options
*/
public function addReferenceList($arNodes, $algorithm, $arTransforms=null, $options=null)
{
if ($xpath = $this->getXPathObj()) {
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($sInfo = $nodeset->item(0)) {
foreach ($arNodes AS $node) {
$this->addRefInternal($sInfo, $node, $algorithm, $arTransforms, $options);
}
}
}
}
/**
* @param DOMElement|string $data
* @param null|string $mimetype
* @param null|string $encoding
* @return DOMElement
*/
public function addObject($data, $mimetype=null, $encoding=null)
{
$objNode = $this->createNewSignNode('Object');
$this->sigNode->appendChild($objNode);
if (! empty($mimetype)) {
$objNode->setAttribute('MimeType', $mimetype);
}
if (! empty($encoding)) {
$objNode->setAttribute('Encoding', $encoding);
}
if ($data instanceof DOMElement) {
$newData = $this->sigNode->ownerDocument->importNode($data, true);
} else {
$newData = $this->sigNode->ownerDocument->createTextNode($data);
}
$objNode->appendChild($newData);
return $objNode;
}
/**
* @param null|DOMNode $node
* @return null|XMLSecurityKey
*/
public function locateKey($node=null)
{
if (empty($node)) {
$node = $this->sigNode;
}
if (! $node instanceof DOMNode) {
return null;
}
if ($doc = $node->ownerDocument) {
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$query = "string(./secdsig:SignedInfo/secdsig:SignatureMethod/@Algorithm)";
$algorithm = $xpath->evaluate($query, $node);
if ($algorithm) {
try {
$objKey = new XMLSecurityKey($algorithm, array('type' => 'public'));
} catch (Exception $e) {
return null;
}
return $objKey;
}
}
return null;
}
/**
* Returns:
* Bool when verifying HMAC_SHA1;
* Int otherwise, with following meanings:
* 1 on succesful signature verification,
* 0 when signature verification failed,
* -1 if an error occurred during processing.
*
* NOTE: be very careful when checking the int return value, because in
* PHP, -1 will be cast to True when in boolean context. Always check the
* return value in a strictly typed way, e.g. "$obj->verify(...) === 1".
*
* @param XMLSecurityKey $objKey
* @return bool|int
* @throws Exception
*/
public function verify($objKey)
{
$doc = $this->sigNode->ownerDocument;
$xpath = new DOMXPath($doc);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
$query = "string(./secdsig:SignatureValue)";
$sigValue = $xpath->evaluate($query, $this->sigNode);
if (empty($sigValue)) {
throw new Exception("Unable to locate SignatureValue");
}
return $objKey->verifySignature($this->signedInfo, base64_decode($sigValue));
}
/**
* @param XMLSecurityKey $objKey
* @param string $data
* @return mixed|string
*/
public function signData($objKey, $data)
{
return $objKey->signData($data);
}
/**
* @param XMLSecurityKey $objKey
* @param null|DOMNode $appendToNode
*/
public function sign($objKey, $appendToNode = null)
{
// If we have a parent node append it now so C14N properly works
if ($appendToNode != null) {
$this->resetXPathObj();
$this->appendSignature($appendToNode);
$this->sigNode = $appendToNode->lastChild;
}
if ($xpath = $this->getXPathObj()) {
$query = "./secdsig:SignedInfo";
$nodeset = $xpath->query($query, $this->sigNode);
if ($sInfo = $nodeset->item(0)) {
$query = "./secdsig:SignatureMethod";
$nodeset = $xpath->query($query, $sInfo);
$sMethod = $nodeset->item(0);
$sMethod->setAttribute('Algorithm', $objKey->type);
$data = $this->canonicalizeData($sInfo, $this->canonicalMethod);
$sigValue = base64_encode($this->signData($objKey, $data));
$sigValueNode = $this->createNewSignNode('SignatureValue', $sigValue);
if ($infoSibling = $sInfo->nextSibling) {
$infoSibling->parentNode->insertBefore($sigValueNode, $infoSibling);
} else {
$this->sigNode->appendChild($sigValueNode);
}
}
}
}
public function appendCert()
{
}
/**
* @param XMLSecurityKey $objKey
* @param null|DOMNode $parent
*/
public function appendKey($objKey, $parent=null)
{
$objKey->serializeKey($parent);
}
/**
* This function inserts the signature element.
*
* The signature element will be appended to the element, unless $beforeNode is specified. If $beforeNode
* is specified, the signature element will be inserted as the last element before $beforeNode.
*
* @param DOMNode $node The node the signature element should be inserted into.
* @param DOMNode $beforeNode The node the signature element should be located before.
*
* @return DOMNode The signature element node
*/
public function insertSignature($node, $beforeNode = null)
{
$document = $node->ownerDocument;
$signatureElement = $document->importNode($this->sigNode, true);
if ($beforeNode == null) {
return $node->insertBefore($signatureElement);
} else {
return $node->insertBefore($signatureElement, $beforeNode);
}
}
/**
* @param DOMNode $parentNode
* @param bool $insertBefore
* @return DOMNode
*/
public function appendSignature($parentNode, $insertBefore = false)
{
$beforeNode = $insertBefore ? $parentNode->firstChild : null;
return $this->insertSignature($parentNode, $beforeNode);
}
/**
* @param string $cert
* @param bool $isPEMFormat
* @return string
*/
public static function get509XCert($cert, $isPEMFormat=true)
{
$certs = self::staticGet509XCerts($cert, $isPEMFormat);
if (! empty($certs)) {
return $certs[0];
}
return '';
}
/**
* @param string $certs
* @param bool $isPEMFormat
* @return array
*/
public static function staticGet509XCerts($certs, $isPEMFormat=true)
{
if ($isPEMFormat) {
$data = '';
$certlist = array();
$arCert = explode("\n", $certs);
$inData = false;
foreach ($arCert AS $curData) {
if (! $inData) {
if (strncmp($curData, '-----BEGIN CERTIFICATE', 22) == 0) {
$inData = true;
}
} else {
if (strncmp($curData, '-----END CERTIFICATE', 20) == 0) {
$inData = false;
$certlist[] = $data;
$data = '';
continue;
}
$data .= trim($curData);
}
}
return $certlist;
} else {
return array($certs);
}
}
/**
* @param DOMElement $parentRef
* @param string $cert
* @param bool $isPEMFormat
* @param bool $isURL
* @param null|DOMXPath $xpath
* @param null|array $options
* @throws Exception
*/
public static function staticAdd509Cert($parentRef, $cert, $isPEMFormat=true, $isURL=false, $xpath=null, $options=null)
{
if ($isURL) {
$cert = file_get_contents($cert);
}
if (! $parentRef instanceof DOMElement) {
throw new Exception('Invalid parent Node parameter');
}
$baseDoc = $parentRef->ownerDocument;
if (empty($xpath)) {
$xpath = new DOMXPath($parentRef->ownerDocument);
$xpath->registerNamespace('secdsig', self::XMLDSIGNS);
}
$query = "./secdsig:KeyInfo";
$nodeset = $xpath->query($query, $parentRef);
$keyInfo = $nodeset->item(0);
$dsig_pfx = '';
if (! $keyInfo) {
$pfx = $parentRef->lookupPrefix(self::XMLDSIGNS);
if (! empty($pfx)) {
$dsig_pfx = $pfx.":";
}
$inserted = false;
$keyInfo = $baseDoc->createElementNS(self::XMLDSIGNS, $dsig_pfx.'KeyInfo');
$query = "./secdsig:Object";