[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?

Mon Mar 30 10:22:16 CDT 2009

On Mon, 2009-03-30 at 11:00 -0400, Tom Scavo wrote:
> Hi Weizhong,
> 
> Can you outline why you think the VOMS SAML assertion is not
> compatible with the WSS SAML Token Profile?
> 
> Thanks,
> Tom
> 
> PS. The comments quoted below mostly refer to a VOMS SAML assertion
> bound to an X.509 proxy certificate (but the requirements are not the
> same as a VOMS SAML assertion bound to SOAP header).
Correct, and please note that the Strawman profiles the use of SAML
assertions in the SOAP Header, not bound with a proxy. Anyway we got
that as a use case and are willing to work in a direction that can
accomodate both uses.

Valerio


> On Mon, Mar 30, 2009 at 10:25 AM, weizhong qiang
> <weizhongqiang at gmail.com> wrote:
> > 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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