[Pgi-wg] [gridshib-user] comments regarding a VOMS-SAML token--ANY plan to make VOMS SAML assertion be compatible with WS-Security SAML Token profile?
weizhong qiang
weizhongqiang at gmail.com
Mon Mar 30 09:25:19 CDT 2009
hi voms folks, all,
The current voms SAML assertion is not compatible with WS-Security SAML
Token profile. I would ask is there any plan to change it to make it be
compatible? I ask this because I think if so, the SAML assertion can be used
for SOAP message layer authentication, other than just including SAML
attribute assertion.
Thanks
Weizhong Qiang
On Tue, Feb 10, 2009 at 5:21 AM, Tom Scavo <trscavo at gmail.com> wrote:
> Thanks to Benjamin for posting this VOMS-SAML response to gt-user. A
> critique (of the SAML, not Benjamin :) follows.
>
> - Note that the output is a <samlp:Response> element, not a
> <saml:Assertion> element. This is wrong. The requester must consume
> the response. Not sure why this isn't happening.
>
> - The value of the <saml:Issuer> element in the response is a DN but
> the Format XML attribute is missing. This is a bug. The default
> Format is "unspecified" but clearly this is not.
>
> - Second-level status codes are desirable so they can be echoed on the
> command line (if any).
>
> - Same comment about the <saml:Issuer> element in the assertion.
>
> - The use of SAML metadata requires that the Format on the
> <saml:Issuer> element be "entity" but clearly it is not. Thus the use
> of SAML metadata by the relying party is precluded.
>
> - Don't know if Shibboleth/OpenSAML can verify the signature (which is
> tricky business). This is a future experiment that needs to be done.
>
> - The <saml:SubjectConfirmation> element contains a
> <ds:X509Certificate> element, which precludes the binding of this
> holder-of-key assertion to a proxy certificate. This is a bug. Use a
> <ds:X509SubjectName> element instead (which causes the NameID itself
> to be redundant).
>
> - If the assertion is bound to a proxy certificate, the NotBefore and
> NotOnOrAfter attributes are redundant and superfluous. In fact, they
> may be wrong since they must agree with the NotBefore and NotOnOrAfter
> fields of the proxy.
>
> - Since the client authenticated directly to the server, a
> <saml:AuthnStatement> is desirable (not required, but potentially
> useful at the relying party).
>
> - The NameFormat XML attribute on the <saml:Attribute> element should
> be "uri" not "unspecified".
>
> - The "xsi:" prefix on the <saml:AttributeValue> element is undefined.
> This is a bug.
>
> - The <saml:AttributeValue> elements do not conform to the XACML
> Attribute Profile (actually, I don't think the attributes conform to
> *any* SAML V2.0 attribute profile).
>
> Hope this helps,
> Tom
>
> ---------- Forwarded message ----------
> From: Benjamin Henne <henne at rvs.uni-hannover.de>
> Date: Wed, Feb 4, 2009 at 1:59 AM
> Subject: Re: [gt-user] SAML based VOMS Server
> To: Tom Scavo <trscavo at gmail.com>
> Cc: GT User <gt-user at globus.org>
>
>
> <Response xmlns="urn:oasis:names:tc:SAML:2.0:protocol"
> xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol"
> ID="_d01d46b7-d16a-4ae8-b9bb-beb8844838b6"
> InResponseTo="_qwertyuiopasdfghjklzxcvbn"
> IssueInstant="2008-10-16T19:03:57.922Z" Version="2.0">
> <saml:Issuer xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion">CN=
> voms3.gridlab.uni-hannover.de
> ,OU=UniHannover,O=GermanGrid,C=DE</saml:Issuer>
> <Status>
> <StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/>
> </Status>
> <saml:Assertion xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"
> ID="_81b685e5-4650-4ba9-b1c6-0ed957cc33ac"
> IssueInstant="2008-10-16T19:03:57.920Z" Version="2.0">
> <saml:Issuer>CN=voms3.gridlab.uni-hannover.de
> ,OU=UniHannover,O=GermanGrid,C=DE</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="#_81b685e5-4650-4ba9-b1c6-0ed957cc33ac">
> <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="ds saml
> xs"/></ds:Transform>
> </ds:Transforms>
> <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
> <ds:DigestValue>j55K/cn8GQNuTQ52Kr3r0NGRJ0w=</ds:DigestValue>
> </ds:Reference>
> </ds:SignedInfo>
> <ds:SignatureValue>
> ...
> </ds:SignatureValue>
>
> <ds:KeyInfo><ds:X509Data><ds:X509Certificate>...</ds:X509Certificate></ds:X509Data></ds:KeyInfo></ds:Signature>
> <saml:Subject>
> <saml:NameID
>
> Format="urn:oasis:names:tc:SAML:1.1:nameid-format:X509SubjectName">CN=Benjamin
> Henne,OU=UniHannover,O=GermanGrid,C=DE</saml:NameID>
> <saml:SubjectConfirmation
> Method="urn:oasis:names:tc:SAML:2.0:cm:holder-of-key">
> <saml:SubjectConfirmationData>
> <ds:KeyInfo xmlns:ds="http://www.w3.org/2000/09/xmldsig#">
> <ds:X509Data>
> <ds:X509Certificate>...</ds:X509Certificate>
> </ds:X509Data>
> </ds:KeyInfo>
> </saml:SubjectConfirmationData>
> </saml:SubjectConfirmation>
> </saml:Subject>
> <saml:Conditions NotBefore="2008-10-16T19:03:57.920Z"
> NotOnOrAfter="2008-10-17T06:03:57.920Z"/>
> <saml:AttributeStatement>
> <saml:Attribute Name="http://voms.forge.cnaf.infn.it/roles"
> NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified">
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">VO-Admin@/RVS</saml:AttributeValue>
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">resass@/RVS/education</saml:AttributeValue>
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">staff@/RVS/research/SAML</saml:AttributeValue>
> </saml:Attribute>
> <saml:Attribute Name="nationality"
> NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified">
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">German</saml:AttributeValue>
> </saml:Attribute>
> <saml:Attribute Name="http://voms.forge.cnaf.infn.it/group"
> NameFormat="urn:oasis:names:tc:SAML:2.0:attrname-format:unspecified">
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">/RVS/education</saml:AttributeValue>
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">/RVS</saml:AttributeValue>
> <saml:AttributeValue
> xmlns:xs="http://www.w3.org/2001/XMLSchema"
> xsi:type="xs:string">/RVS/research</saml:AttributeValue>
> </saml:Attribute>
> </saml:AttributeStatement>
> </saml:Assertion>
> </Response>
>
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