Devon Devon - 1 month ago 13
Java Question

Signing response using openSAML

I am attempting to implement SAML 2.0 by signing the response, instead of the Assertion. I have 3 existing vendors that accept my signature at the Assertion level, however a new vendor is requesting it at the protocol / response level. I have been Googling and debugging for about 8 hours, and cannot find a valid example of what I am doing wrong. My code below shows clearly what I am doing, and the last 10 lines or so of it are the differences that I have implemented (within the if / else). Also, I noticed in my XML that my SignatureValue and DigestValue are both empty. Can anyone point me towards some clear documentation, or better yet, an example of a working response signature using openSAML? At this point, any help is appreciated.

Assertion assertion = OpenSamlHelper.CreateSamlAssertion(
issuer.trim(), recipient.trim(), domain.trim(), subject.trim(),
attributes);


//
// Sign
//
Credential signingCredential = getSigningCredential(keystore, storetype, storepass, alias, keypass);

Signature signature = (Signature) Configuration.getBuilderFactory()
.getBuilder(Signature.DEFAULT_ELEMENT_NAME)
.buildObject(Signature.DEFAULT_ELEMENT_NAME);

signature.setSigningCredential(signingCredential);
signature.setSignatureAlgorithm(SignatureConstants.ALGO_ID_SIGNATURE_RSA_SHA1);
signature.setCanonicalizationAlgorithm(SignatureConstants.ALGO_ID_C14N_EXCL_OMIT_COMMENTS);



SecurityConfiguration secConfiguration = Configuration.getGlobalSecurityConfiguration();
NamedKeyInfoGeneratorManager namedKeyInfoGeneratorManager = secConfiguration.getKeyInfoGeneratorManager();
KeyInfoGeneratorManager keyInfoGeneratorManager = namedKeyInfoGeneratorManager.getDefaultManager();
KeyInfoGeneratorFactory keyInfoGeneratorFactory = keyInfoGeneratorManager.getFactory(signingCredential);
KeyInfoGenerator keyInfoGenerator = keyInfoGeneratorFactory.newInstance();
KeyInfo keyInfo = null;
try {
keyInfo = keyInfoGenerator.generate(signingCredential);
} catch (Exception e) {
logger.error(e);
}
signature.setKeyInfo(keyInfo);

String saml = "";
try {
MarshallerFactory marshallerFactory = Configuration.getMarshallerFactory();
if (signatureType == SignatureType.Response) {
response.setSignature(signature);
marshallerFactory.getMarshaller(response).marshall(response);
}
if (signatureType == SignatureType.Assertion) {
assertion.setSignature(signature);
marshallerFactory.getMarshaller(assertion).marshall(assertion);
}
Signer.signObject(signature);


UPDATE: The XML I was getting with the above code did not include a signatureValue or Digest Value, like below..

<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="#_651cc837-e890-46c7-9cf9-646ffd38aaad">
<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#">
<ec:InclusiveNamespaces xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="xs"/>
</ds:Transform>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue/>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue/>


After moving the Signer.signObject(signature); to a point after the assertion was attached to the response, I receive the following XML..

<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="#_273e38e9-3b51-4845-8b8b-f0970e3e9bab">
<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#">
<ec:InclusiveNamespaces xmlns:ec="http://www.w3.org/2001/10/xml-exc-c14n#" PrefixList="xs"/>
</ds:Transform>
</ds:Transforms>
<ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
<ds:DigestValue>UlVtsjSAvtjOLMbw+HUX9n7FtxM=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>
jM7GxZ77VBHuAatMXLx14s0ExOmmfDpBhCpF8OKV4F3C1BiRutM41aTH25yhgSn+6l4TkK6kEDbFOYI6isvJUhtdVgH4E1xJl0DFfvPJphTF096acvJrLPehpsFd2Ab6sARuV1sbg/gwNFzvlHJWgit5NxHNuFN1qcv3vuhvQ83fOfxxuyLyJrEjpqvbRzwWepHiuTVHlNObrUvjVxEc7AUKPtwTqGlA6y3SdzIDwjN/LsB1V6PWhiMZsbxJx3LUuk5UECOYmRhKQifZWdOdvHoWBq05J54I6RvAplNDTfRBr4AM+tfIz3OXpN6OpKdSC43HRg9LO9bXprui+4CvrQ==
</ds:SignatureValue>

Answer

I tried to sign and artifact response using this code, just switching the entityDescriptor to an artifactResponse and it worked fine. http://mylifewithjava.blogspot.no/2012/11/signing-with-opensaml.html

<?xml version="1.0" encoding="UTF-8"?><saml2p:ArtifactResponse xmlns:saml2p="urn:oasis:names:tc:SAML:2.0:protocol" Version="2.0">
<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="">
<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>ZkE02ZnvIqyd+FcfL6PaXNI88Co=</ds:DigestValue>
</ds:Reference>
</ds:SignedInfo>
<ds:SignatureValue>fDxfW06rbJEFu5nqmsGxwt6O53N8FWwmDOO0e3nUWh0in2TRYD9nj2927pnQZNL4Mk3KAcSWVETUuHX11XWL+MgcosfJd31TR0XEui/F+BbojQlXJRHfD2BfEO9cQCygFSyyOb9tE2FU5noqnx2b3vI5mToam3a135007mAN/t14Jm71EfvvCF9qL2wXI55R8uab0WGqXx1LYSrAjBZq455SH9AIQu+n8L+KaiOzfpjiL+h/5YJ/a+uyiLV6H06TsytowDTBSW67YW110fpoOsD5vgULrZOABmeK6NRZWpI8PK1M+/r6SO0DTEbUiSTYtHz9XBcqbnD9d7ZQ3oZpEQ==</ds:SignatureValue>
<ds:KeyInfo>
<ds:X509Data>
<ds:X509Certificate>MIIDaTCCAlGgAwIBAgIEeL6vczANBgkqhkiG9w0BAQsFADBlMQswCQYDVQQGEwJOTzENMAsGA1UE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</ds:X509Certificate>
</ds:X509Data>
</ds:KeyInfo>
</ds:Signature>
</saml2p:ArtifactResponse>

Try to skip the KeyInfo part. Your not getting any marshalling errors?

Comments