SimpleXml (simple_xml v1.0.1)
This is a thin wrapper around the saxy library. It leverages the DOM generated by saxy's
SimpleForm parser and defines some basic operations on the DOM via the XmlNode
module.
The main benefit of using saxy's SimpleForm parsing is that it gives us a string presentation of the XML DOM, without exposing the users of this library with the atom exhaustion vulernability of the xmerl library and any parsers based on it.
Summary
Functions
Parses an XML string to return a tuple representing the XML node.
Verifies the signature contained within the XML document represented by the given node. For the sake of simplicity of implementation, this function expects the following to be true for the given XML document
Types
public_key()
xml_attribute()
xml_node()
@type xml_node() :: {String.t(), [xml_attribute()], [tuple()]}
Functions
parse(data)
@spec parse(String.t()) :: {:ok, xml_node()} | {:error, Saxy.ParseError.t()}
Parses an XML string to return a tuple representing the XML node.
Examples
Well-formed XMLs are successfully parsed
iex> SimpleXml.parse(~S{<foo attr1="value1" attr2="value2">body</foo>})
{:ok, {"foo", [{"attr1", "value1"}, {"attr2", "value2"}], ["body"]}}
Malformed XMLs result in an error
iex> SimpleXml.parse("<foo")
{:error, %Saxy.ParseError{reason: {:token, :name_start_char}, binary: "<foo", position: 4}}
verify(node, public_key)
@spec verify(xml_node(), public_key()) :: :ok | {:error, any()}
Verifies the signature contained within the XML document represented by the given node. For the sake of simplicity of implementation, this function expects the following to be true for the given XML document:
- Signature conforms to the XMLDSIG-CORE1 spec
- Canonicalization method is XML-ENC-C14N
- Transformation method includes XMLDSIG-enveloped-signature
- Digest method is XMLENC-SHA256
- Signature method is XMLDSIG-SHA256
Arguments:
- node: The xml_node corresponding to the document or portion of the document to be verified
- public_key: The key to use for verifying the signature. Value matches the key argument given
to
:pubic_key.verify/4
. Please see document here for further details.
Examples
Verifies a valid signature via the given public key
iex> cert_der = ~S(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)
iex> {:ok, cert} = cert_der |> Base.decode64!() |> X509.Certificate.from_der()
iex> public_key = X509.Certificate.public_key(cert)
iex> saml_response = "<?xml version="1.0" encoding="UTF-8"?><saml2p:Response Destination="https://local.mbx.com:4001/auth/ahead/sso" ID="id27784047887591772815846703" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887591772815846703"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>msXV7poKgVJ15JasyNMVwEECj0rN8ecyGToouXWz/Gk=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>g3WHivBGhPsMa030h9BUIAWaErAWd28uDjBUHROQ+ehKwjqxkCPlc4ZUwrF+gnFmw2lt81nppo5U0ESmn/AGJ60J20ZxVRgjsZxK1AhVqr40u0wA6f6jCJiJWnbqIGWXDXyikWO0/4rqOdD9wP8Dw2Pmio2+vMsNIlpNyu2yoAz2usln/vFeSYtY5mK095x7wUcHaW0ocZpOULDDjSb0qGN8V7WgJvFhHPqDbNpG11RBcZsEqFulaGzv2Puu9hDyu+Z0HNqT0+3F0I1TinMJG33Pqs2RsokCZLxz2GB4wjdpNTRNM7J7ih7Ly7f9kdOMaLm+6c917zn3bJP7V9Gb9g==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG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</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2p:Status xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></saml2p:Status><saml2:Assertion ID="id27784047887784728211931895" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887784728211931895"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>6ovmwpV6M4lwACpFgKjVm+6VySKttObU1vckofUVkfA=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>PthKpmSci797DDLoMtuMBG68/o6ep1RIlYGDaETzCQ5kFTvd71bwEjc9ivQWeSuG3U8iC6Lt/7HfXJTT0Kyi/SiZkzHfIulIJm5PNofzeuuuEAYr0PhyJbvBGRN8EatPL0V3lvXO1OXhw1SimbS0dGhBGB3Z/4Jmj3A0gFnlyNJN/78xX+bPuxBKxQXpV9M10NrKEF+o75MP7nn19nJ3M6lowHAGgtaDX9u3Fa2w/8xAqFNt64wZ0DPaimAitDPJvtH/uU7y4rmeR+tqzjvsGGpm83c5SswWDgZxjPCIWGETZUWGCDponVW7TGBn44xoVYPHDE+IqbrX7TUr2HQhPg==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG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</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">dj.jain</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData NotOnOrAfter="2023-07-10T13:45:29.659Z" Recipient="https://local.mbx.com:4001/auth/ahead/sso"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2023-07-10T13:35:29.659Z" NotOnOrAfter="2023-07-10T13:45:29.659Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>xqO52CNELd0hVB9vaX1d_dcwuYAxGUSr</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2023-07-10T13:40:29.658Z" SessionIndex="id1688996429657.1145032012" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement></saml2:Assertion></saml2p:Response>"
iex> {:ok, saml_body} = saml_response |> Base.decode64()
iex> {:ok, root} = SimpleXml.parse(saml_body)
iex> SimpleXml.verify(root, public_key)
:ok
Verification fails if the digest doesn't match the expected value
iex> cert_der = ~S(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)
iex> {:ok, cert} = cert_der |> Base.decode64!() |> X509.Certificate.from_der()
iex> public_key = X509.Certificate.public_key(cert)
iex> saml_response = "<?xml version="1.0" encoding="UTF-8"?><saml2p:Response Destination="https://local.mbx.com:4001/auth/ahead/sso" ID="id27784047887591772815846703" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887591772815846703"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>BAD_DIGEST</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>g3WHivBGhPsMa030h9BUIAWaErAWd28uDjBUHROQ+ehKwjqxkCPlc4ZUwrF+gnFmw2lt81nppo5U0ESmn/AGJ60J20ZxVRgjsZxK1AhVqr40u0wA6f6jCJiJWnbqIGWXDXyikWO0/4rqOdD9wP8Dw2Pmio2+vMsNIlpNyu2yoAz2usln/vFeSYtY5mK095x7wUcHaW0ocZpOULDDjSb0qGN8V7WgJvFhHPqDbNpG11RBcZsEqFulaGzv2Puu9hDyu+Z0HNqT0+3F0I1TinMJG33Pqs2RsokCZLxz2GB4wjdpNTRNM7J7ih7Ly7f9kdOMaLm+6c917zn3bJP7V9Gb9g==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG
A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU
MBIGA1UECwwLU1NPUHJvdmlkZXIxFTATBgNVBAMMDGRldi00NTM0OTkwNjEcMBoGCSqGSIb3DQEJ
ARYNaW5mb0Bva3RhLmNvbTAeFw0yMzA2MjcxMTE3NTlaFw0zMzA2MjcxMTE4NTlaMIGUMQswCQYD
VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsG
A1UECgwET2t0YTEUMBIGA1UECwwLU1NPUHJvdmlkZXIxFTATBgNVBAMMDGRldi00NTM0OTkwNjEc
MBoGCSqGSIb3DQEJARYNaW5mb0Bva3RhLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC
ggEBALTE7IRG+oQZBASQ7DY3yeTrwABdI2BgG2FXKSkTPk9enMwtyUyDXCOteOg18+//MA2UTvgS
I+n0fiAh7Bi7cxpimnOaj/kcgvpdn+5wpEfSIDKAeEg9VIQf0fz/ks4XkrNxRh8ba6Z/ypOVR2TL
ozu8v6sjGCiqHSoiPl78KINHx9jMB3QGdTHRxsTzwFPGcUEvO7XvjxxMN9FLZdHkwtA6cZXDbHlA
v+o4EbLIRqXFc3vF5rs3Fz+cgqZ3HVGm90TFFcbPbx/eKcvzyHdYt8P5pi364mijt9NKtNV9F9Vd
Pz+Gp/rxlw0i/IWxV0/vBrW10HPd42krsOgHibxBYg8CAwEAATANBgkqhkiG9w0BAQsFAAOCAQEA
rpYzZEoYcRo3YF7Ny4gdc8ODSlPPKIdLvwhUTGbPdzJU2ifxzE/KeTHGmFpjpakjDmmWsr2j9FGU
/9U0SjqPmJHP5gYbjmz+tD3jeaEkIBDZpcYc+MveQaA7uDMILA2OUhHuFu0UJVjGxl2EIpxivC+I
J0RpBS5AERT6V91Fqv2Ylwb5sklhoXGDx9s+l+Ud1MLaewIvnUHdIRtC02bvlhjwt0pnICDtHMik
vOiTXjTBJgl7X9Q51Gm636q9pJVjS1T0gR3cNt9JJE/foDdOK8JozRFtF4j14xegXLt7BVBIXuSO
K6P1c09mCPQ1VJbcj01S1zfrvZ+RZvrxr/0aXQ==</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2p:Status xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></saml2p:Status><saml2:Assertion ID="id27784047887784728211931895" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887784728211931895"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>6ovmwpV6M4lwACpFgKjVm+6VySKttObU1vckofUVkfA=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>PthKpmSci797DDLoMtuMBG68/o6ep1RIlYGDaETzCQ5kFTvd71bwEjc9ivQWeSuG3U8iC6Lt/7HfXJTT0Kyi/SiZkzHfIulIJm5PNofzeuuuEAYr0PhyJbvBGRN8EatPL0V3lvXO1OXhw1SimbS0dGhBGB3Z/4Jmj3A0gFnlyNJN/78xX+bPuxBKxQXpV9M10NrKEF+o75MP7nn19nJ3M6lowHAGgtaDX9u3Fa2w/8xAqFNt64wZ0DPaimAitDPJvtH/uU7y4rmeR+tqzjvsGGpm83c5SswWDgZxjPCIWGETZUWGCDponVW7TGBn44xoVYPHDE+IqbrX7TUr2HQhPg==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG
A1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsGA1UECgwET2t0YTEU
MBIGA1UECwwLU1NPUHJvdmlkZXIxFTATBgNVBAMMDGRldi00NTM0OTkwNjEcMBoGCSqGSIb3DQEJ
ARYNaW5mb0Bva3RhLmNvbTAeFw0yMzA2MjcxMTE3NTlaFw0zMzA2MjcxMTE4NTlaMIGUMQswCQYD
VQQGEwJVUzETMBEGA1UECAwKQ2FsaWZvcm5pYTEWMBQGA1UEBwwNU2FuIEZyYW5jaXNjbzENMAsG
A1UECgwET2t0YTEUMBIGA1UECwwLU1NPUHJvdmlkZXIxFTATBgNVBAMMDGRldi00NTM0OTkwNjEc
MBoGCSqGSIb3DQEJARYNaW5mb0Bva3RhLmNvbTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoC
ggEBALTE7IRG+oQZBASQ7DY3yeTrwABdI2BgG2FXKSkTPk9enMwtyUyDXCOteOg18+//MA2UTvgS
I+n0fiAh7Bi7cxpimnOaj/kcgvpdn+5wpEfSIDKAeEg9VIQf0fz/ks4XkrNxRh8ba6Z/ypOVR2TL
ozu8v6sjGCiqHSoiPl78KINHx9jMB3QGdTHRxsTzwFPGcUEvO7XvjxxMN9FLZdHkwtA6cZXDbHlA
v+o4EbLIRqXFc3vF5rs3Fz+cgqZ3HVGm90TFFcbPbx/eKcvzyHdYt8P5pi364mijt9NKtNV9F9Vd
Pz+Gp/rxlw0i/IWxV0/vBrW10HPd42krsOgHibxBYg8CAwEAATANBgkqhkiG9w0BAQsFAAOCAQEA
rpYzZEoYcRo3YF7Ny4gdc8ODSlPPKIdLvwhUTGbPdzJU2ifxzE/KeTHGmFpjpakjDmmWsr2j9FGU
/9U0SjqPmJHP5gYbjmz+tD3jeaEkIBDZpcYc+MveQaA7uDMILA2OUhHuFu0UJVjGxl2EIpxivC+I
J0RpBS5AERT6V91Fqv2Ylwb5sklhoXGDx9s+l+Ud1MLaewIvnUHdIRtC02bvlhjwt0pnICDtHMik
vOiTXjTBJgl7X9Q51Gm636q9pJVjS1T0gR3cNt9JJE/foDdOK8JozRFtF4j14xegXLt7BVBIXuSO
K6P1c09mCPQ1VJbcj01S1zfrvZ+RZvrxr/0aXQ==</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">dj.jain</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData NotOnOrAfter="2023-07-10T13:45:29.659Z" Recipient="https://local.mbx.com:4001/auth/ahead/sso"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2023-07-10T13:35:29.659Z" NotOnOrAfter="2023-07-10T13:45:29.659Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>xqO52CNELd0hVB9vaX1d_dcwuYAxGUSr</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2023-07-10T13:40:29.658Z" SessionIndex="id1688996429657.1145032012" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement></saml2:Assertion></saml2p:Response>"
iex> {:ok, saml_body} = saml_response |> Base.decode64()
iex> {:ok, root} = SimpleXml.parse(saml_body)
iex> SimpleXml.verify(root, public_key)
{:error, :digest_verification_failed}
Verification fails if the signature doesn't match the expected value
iex> cert_der = ~S(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)
iex> {:ok, cert} = cert_der |> Base.decode64!() |> X509.Certificate.from_der()
iex> public_key = X509.Certificate.public_key(cert)
iex> saml_response = "<?xml version="1.0" encoding="UTF-8"?><saml2p:Response Destination="https://local.mbx.com:4001/auth/ahead/sso" ID="id27784047887591772815846703" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887591772815846703"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>msXV7poKgVJ15JasyNMVwEECj0rN8ecyGToouXWz/Gk=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>QkFEX1NJR05BVFVSRQ==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG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</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2p:Status xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol"><saml2p:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/></saml2p:Status><saml2:Assertion ID="id27784047887784728211931895" IssueInstant="2023-07-10T13:40:29.658Z" Version="2.0" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:Issuer Format="urn:oasis:names:tc:SAML:2.0:nameid-format:entity" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion">http://www.okta.com/exka5ha6bknY6Okd85d7</saml2: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/2001/04/xmldsig-more#rsa-sha256"/><ds:Reference URI="#id27784047887784728211931895"><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/2001/04/xmlenc#sha256"/><ds:DigestValue>6ovmwpV6M4lwACpFgKjVm+6VySKttObU1vckofUVkfA=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>PthKpmSci797DDLoMtuMBG68/o6ep1RIlYGDaETzCQ5kFTvd71bwEjc9ivQWeSuG3U8iC6Lt/7HfXJTT0Kyi/SiZkzHfIulIJm5PNofzeuuuEAYr0PhyJbvBGRN8EatPL0V3lvXO1OXhw1SimbS0dGhBGB3Z/4Jmj3A0gFnlyNJN/78xX+bPuxBKxQXpV9M10NrKEF+o75MP7nn19nJ3M6lowHAGgtaDX9u3Fa2w/8xAqFNt64wZ0DPaimAitDPJvtH/uU7y4rmeR+tqzjvsGGpm83c5SswWDgZxjPCIWGETZUWGCDponVW7TGBn44xoVYPHDE+IqbrX7TUr2HQhPg==</ds:SignatureValue><ds:KeyInfo><ds:X509Data><ds:X509Certificate>MIIDqDCCApCgAwIBAgIGAYj8lAYkMA0GCSqGSIb3DQEBCwUAMIGUMQswCQYDVQQGEwJVUzETMBEG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</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature><saml2:Subject xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:NameID Format="urn:oasis:names:tc:SAML:1.1:nameid-format:unspecified">dj.jain</saml2:NameID><saml2:SubjectConfirmation Method="urn:oasis:names:tc:SAML:2.0:cm:bearer"><saml2:SubjectConfirmationData NotOnOrAfter="2023-07-10T13:45:29.659Z" Recipient="https://local.mbx.com:4001/auth/ahead/sso"/></saml2:SubjectConfirmation></saml2:Subject><saml2:Conditions NotBefore="2023-07-10T13:35:29.659Z" NotOnOrAfter="2023-07-10T13:45:29.659Z" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AudienceRestriction><saml2:Audience>xqO52CNELd0hVB9vaX1d_dcwuYAxGUSr</saml2:Audience></saml2:AudienceRestriction></saml2:Conditions><saml2:AuthnStatement AuthnInstant="2023-07-10T13:40:29.658Z" SessionIndex="id1688996429657.1145032012" xmlns:saml2="urn:oasis:names:tc:SAML:2.0:assertion"><saml2:AuthnContext><saml2:AuthnContextClassRef>urn:oasis:names:tc:SAML:2.0:ac:classes:PasswordProtectedTransport</saml2:AuthnContextClassRef></saml2:AuthnContext></saml2:AuthnStatement></saml2:Assertion></saml2p:Response>"
iex> {:ok, saml_body} = saml_response |> Base.decode64()
iex> {:ok, root} = SimpleXml.parse(saml_body)
iex> SimpleXml.verify(root, public_key)
{:error, :signature_verification_failed}