Php SAML的正确XML规范化

我在验证SAML2.0断言XML的签名时遇到了问题。我正在使用simpleSAMLphp项目中的SAML2库，它反过来使用PHP

xmlseclibs

库对XML进行签名并验证签名

我收到我的合伙人的以下声明：

<saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" Version="2.0" ID="_c43265fe-8cd5-410f-b63d-dac9f266d4c9" IssueInstant="2015-01-23T17:46:28.456Z"><saml:Issuer>uat.test.com/saml2.0</saml:Issuer><Signature xmlns="http://www.w3.org/2000/09/xmldsig#"><SignedInfo><CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1"/><Reference URI="#_c43265fe-8cd5-410f-b63d-dac9f266d4c9"><Transforms><Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/><Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"><InclusiveNamespaces xmlns="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="#default saml ds xs xsi"/></Transform></Transforms><DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/><DigestValue>mFKEIdw+cEielORqscbHuAJhI58=</DigestValue></Reference></SignedInfo><SignatureValue>kEZHloxYJVqDg8oxLNpl+sbJYhv9r7yYU5yQi71gCNm/Cdtj9/P2LR5cnopKZZu+7j3PVimeZoir6RTTrdVKTLkp+PmvOmTlLH/LVtntQZ68TaUxUd3BvtQiKuJ8KFwWPmQ+W3RIKv4ySAsy6PUiWPcr8eIYpIiUA6rxCuSEpdA=</SignatureValue><KeyInfo><X509Data><X509Certificate>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</X509Certificate></X509Data></KeyInfo></Signature><saml:Subject><saml:NameID>000786320</saml:NameID><saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml:SubjectConfirmationData NotOnOrAfter="2015-01-23T17:51:28.471Z" Recipient="https://test.com/sso"/></saml:SubjectConfirmation></saml:Subject><saml:Conditions NotBefore="2015-01-23T17:41:28.456Z" NotOnOrAfter="2015-01-23T17:51:28.456Z"><saml:AudienceRestriction><saml:Audience>test.com:saml2.0</saml:Audience></saml:AudienceRestriction></saml:Conditions><saml:AuthnStatement AuthnInstant="2015-01-23T17:46:28.456Z" SessionIndex="SI-8bd89651-62da-4b7d-9a54-04eb2eb90784"><saml:AuthnContext><saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:Password</saml:AuthnContextClassRef></saml:AuthnContext></saml:AuthnStatement><saml:AttributeStatement><saml:Attribute Name="email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="email"><saml:AttributeValue>invalidemail@invalid.com</saml:AttributeValue></saml:Attribute><saml:Attribute Name="firstName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="firstName"><saml:AttributeValue>Diane</saml:AttributeValue></saml:Attribute><saml:Attribute Name="lastname" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="lastname"><saml:AttributeValue>Test</saml:AttributeValue></saml:Attribute><saml:Attribute Name="zipCode" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="zipCode"><saml:AttributeValue>02062</saml:AttributeValue></saml:Attribute><saml:Attribute Name="businessUnit" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="businessUnit"><saml:AttributeValue>78945</saml:AttributeValue></saml:Attribute><saml:Attribute Name="employeeID" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic" FriendlyName="employeeID"><saml:AttributeValue>000786320</saml:AttributeValue></saml:Attribute></saml:AttributeStatement></saml:Assertion>

然而，我的搭档实际签署的要素是：

<saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion" ID="_c43265fe-8cd5-410f-b63d-dac9f266d4c9" IssueInstant="2015-01-23T17:46:28.456Z" Version="2.0"><saml:Issuer>uat.test.com/saml2.0</saml:Issuer><saml:Subject><saml:NameID>000786320</saml:NameID><saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml:SubjectConfirmationData NotOnOrAfter="2015-01-23T17:51:28.471Z" Recipient="https://test.com/sso"></saml:SubjectConfirmationData></saml:SubjectConfirmation></saml:Subject><saml:Conditions NotBefore="2015-01-23T17:41:28.456Z" NotOnOrAfter="2015-01-23T17:51:28.456Z"><saml:AudienceRestriction><saml:Audience>test.com:saml2.0</saml:Audience></saml:AudienceRestriction></saml:Conditions><saml:AuthnStatement AuthnInstant="2015-01-23T17:46:28.456Z" SessionIndex="SI-8bd89651-62da-4b7d-9a54-04eb2eb90784"><saml:AuthnContext><saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:Password</saml:AuthnContextClassRef></saml:AuthnContext></saml:AuthnStatement><saml:AttributeStatement><saml:Attribute FriendlyName="email" Name="email" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>invalidemail@invalid.com</saml:AttributeValue></saml:Attribute><saml:Attribute FriendlyName="firstName" Name="firstName" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>Diane</saml:AttributeValue></saml:Attribute><saml:Attribute FriendlyName="lastname" Name="lastname" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>Test</saml:AttributeValue></saml:Attribute><saml:Attribute FriendlyName="zipCode" Name="zipCode" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>02062</saml:AttributeValue></saml:Attribute><saml:Attribute FriendlyName="businessUnit" Name="businessUnit" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>78945</saml:AttributeValue></saml:Attribute><saml:Attribute FriendlyName="employeeID" Name="employeeID" NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:basic"><saml:AttributeValue>000786320</saml:AttributeValue></saml:Attribute></saml:AttributeStatement></saml:Assertion>

uat.test.com/saml2.0000786320test.com:saml2.0urn:oasis:names:tc:SAML:2.0:ac:classes:Passwordinvalidemail@invalid.comDianeTest0206278945000786320

但是，如果没有

xmlns:xsi=，情况几乎相同http://www.w3.org/2001/XMLSchema-instance“

名称空间。签名转换元素中提到了

xsi

名称空间：

SAML身份验证因此失败，因为签名中的SHA1摘要与元素上计算的摘要xmlseclibs不匹配

---

所以我想知道这里谁是正确的——xsi名称空间是否必须包含（即使该名称空间中没有元素），因为它包含在InclusiveNamespace中，或者如果不是，为什么

xmlseclibs

将该名称空间包含在C14N规范化中？

实际上，一些进一步的调试表明，问题在于SAML2库中的一个bug（它是smipleSAMLphp项目的一部分：）

解密元素SAML2库时会执行以下操作：

    $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();

事实上，在我的情况下，我做到了这一点。然而，这只是一个q快速破解，并不理想，因为它可能会为不同的实现引入一些其他错误。我想需要与simpleSAMLphp库的创建者合作，才能找到一个更优雅的长期解决方案

    $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();

    $xml = '<root xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">'.
        $decrypted .
        '</root>';
    $newDoc = new DOMDocument();