Question

我正在尝试使用xmlcrypto来解析并验证SAML响应中的<ds:Signature>元素。响应是从我的SSOCircle测试身份提供程序（请参阅下面的完整SAML响应）收到的，并且似乎是标准的samlp响应，其中包含使用xml数字签名正确签名的断言。 / p>

这是我正在使用的代码。这是从github上的xmlcrypto帮助中获取的。

的CoffeeScript

validateSignature: (saml) ->
    doc = new @xmldom.DOMParser().parseFromString saml
    signature = @xmlCrypto.xpath(doc, "/*/*[local-name(.)='Signature' and namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#']")[0]
    signed = new @xmlCrypto.SignedXml null, idAttribute: 'AssertionID'
    signed.loadSignature signature.toString() # this line fails as signature is undefined

如您所见，上面的代码使用xmlCrypto.xpath()函数从解析的xml文档中检索<ds:Signature>元素，但此函数的结果始终为undefined

SAML响应

<samlp:Response ID="s208442fc7db110e1a6e9df3f6f1c66ff8cd64219c" InResponseTo="_de666b2c-1b3c-de17-1cde-0d97211b1ddd" Version="2.0" IssueInstant="2014-07-29T14:33:45Z" Destination="https://localhost/security/saml2/response" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
    <saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">http://idp.ssocircle.com</saml:Issuer>
    <samlp:Status xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
        </samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success" xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol">
    </samlp:Status>
    <saml:Assertion ID="s2b6bb561a07e30465057af94c7aff92f8b0e11143" IssueInstant="2014-07-29T14:33:45Z" Version="2.0" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">
        <saml:Issuer>http://idp.ssocircle.com</saml:Issuer>
        <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
            <ds:SignedInfo>
                <ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
                <ds:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#rsa-sha1" />
                <ds:Reference URI="#s2b6bb561a07e30465057af94c7aff92f8b0e11143">
                    <ds:Transforms>
                        <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
                        <ds:Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
                    </ds:Transforms>
                    <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1" />
                    <ds:DigestValue>Lvm7MFE/Chy3gR97omBDlkNmwO0=</ds:DigestValue>
                </ds:Reference>
            </ds:SignedInfo>
            <ds:SignatureValue>GUBxQmOF0yWvC [...] YslXU=</ds:SignatureValue>
            <ds:KeyInfo>
                <ds:X509Data>
                    <ds:X509Certificate>MIICjDCCAXSg [...] WjeU5FLwDZR0Q=</ds:X509Certificate>
                </ds:X509Data>
            </ds:KeyInfo>
        </ds:Signature>
        <saml:Subject>
            <saml:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress" NameQualifier="http://idp.ssocircle.com">biofractal@gmail.com</saml:NameID>
            <saml:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer">
                <saml:SubjectConfirmationData InResponseTo="_de666b2c-1b3c-de17-1cde-0d97211b1ddd" NotOnOrAfter="2014-07-29T14:43:45Z" Recipient="https://localhost/security/saml2/response" />
            </saml:SubjectConfirmation>
        </saml:Subject>
        <saml:Conditions NotBefore="2014-07-29T14:23:45Z" NotOnOrAfter="2014-07-29T14:43:45Z">
            <saml:AudienceRestriction>
                <saml:Audience>gp-sso-localhost</saml:Audience>
            </saml:AudienceRestriction>
        </saml:Conditions>
        <saml:AuthnStatement AuthnInstant="2014-07-29T08:47:22Z" SessionIndex="s2cd309df973ca61fd0b359e968208375f65d35b01">
            <saml:AuthnContext>
                <saml:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml:AuthnContextClassRef>
            </saml:AuthnContext>
        </saml:AuthnStatement>
    </saml:Assertion>
</samlp:Response>

Answer 1

问题在于xpath，它特定于在根中包含其签名的saml。要在内部断言中查找签名，您需要使用以下行，并更新xpath：

signature = @xmlCrypto.xpath(doc, ".//*[local-name(.)='Signature' and namespace-uri(.)='http://www.w3.org/2000/09/xmldsig#']")[0]

如何使用xmlcrypto从SAML响应中解析Signature元素？

1 个答案: