RE: [wss] Comments on SAML Token Profile

[Michael McIntosh <mikemci@us.ibm.com>]

Michael McIntosh/Watson/IBM wrote on 06/24/2004 07:32:58 PM:

> "Maneesh Sahu" <maneesh@westbridgetech.com> wrote on 06/24/2004 06:20:25 
PM:
> 
> > Hi Michael,
> > 
> > Adding a wsu:Id to the SecurityToken - the SAML Assertion in this case
> > would cause it to violate the SAML schema. Is this permissible?
> 
> Maneesh,
> 
> The proposal is not to add anything to the existing SAML Assertion, but 
to create a
> SAMLToken element with a wsu:Id attribute and a child SAML Assertion 
element.

Another possibility would be to use a wsse:KeyIdentifier to reference the 
SAML Assertion by AssertionID.
This would be prefered to doing it form the wsse:Reference since finding 
tokens by Key Identifier is by definition token specific, but using 
wsse:Reference for Direct Reference to a local token is best done using 
token agnostic methods.

> 
> Thanks,
> Mike
> 
> > 
> > --ms
> > 
> > -----Original Message-----
> > From: Michael McIntosh [mailto:mikemci@us.ibm.com] 
> > Sent: Thursday, June 24, 2004 3:04 PM
> > To: Ron Monzillo
> > Cc: Anthony Nadalin; wss@lists.oasis-open.org
> > Subject: Re: [wss] Comments on SAML Token Profile
> > 
> > Ron Monzillo <Ronald.Monzillo@Sun.COM> wrote on 06/24/2004 12:01:08 
PM:
> > 
> > > 
> > > 
> > > Anthony Nadalin wrote:
> > > 
> > > > We ran into some inconsistencies while participating in the recent 

> > > > SAML interop. The WSS core specification describes a "Direct 
> > > > Reference" mechanism to be used with STRs. A Reference element 
with
> > a 
> > > > URI attribute is used. When the referenced token is located within
> > the 
> > 
> > > > Security header, the URI contains a shorthand XPointer reference 
to 
> > > > the token. In order for this to work, the token element must 
contain
> > 
> > > > an attribute of type ID. WSS defines the wsu:Id attribute with 
type
> > ID 
> > 
> > > > for naming the reference. Direct references within the message
> > should 
> > > > not require token specific methods so we suggest the following
> > actions 
> > 
> > > > be taken:
> > > >
> > > > 1) Errata to the WSS core to make it clear the tokens must have an 

> > > > attribute named wsu:Id.
> > > > 2) Change to the SAML Token Profile to use an wsu:Id attribute or
> > use 
> > > > a wsse:KeyIdentifier
> > > >
> > > These changes are not a good idea.
> > 
> > It is a good idea, otherwise the dereferencing mechanism would require
> > XML 
> > schema processing to enable it to identify which attributes were ID
> > type. 
> > 
> > Please see my response to Rich Levinson.
> > 
> > > 
> > > The wsu:id attribute was defined for use as a convenience where new 
> > shema
> > > elements are being defined, or with elements which support attribute 

> > > extensibility
> > > and which do not already include an id attribute.
> > > 
> > > The only constraint on using an STR Direct Reference with a fragment 

> > > containing
> > > an id value is that the thing being referenced must have an 
attribute
> > of 
> > 
> > > type id.
> > > 
> > > In SAML V1.1 the  AssertionID attribute so qualifies, that is:
> > > 
> > > <attribute name="AssertionID" type="ID" use="required"/>
> > 
> > I do not understand the aversion to adding the wrapper element. It 
seems
> > 
> > to me that it makes it easier for services to support the profile. 
Using
> > 
> > the known ID type of wsu:Id facilitates extensibility of platforms to 
> > enable new token types. Using token specific mechanisms for references 

> > potentially requires modifying the core WSS dereferencing processing 
for
> > 
> > every new token type.
> > 
> > > 
> > > Ron
> > > 
> > > PS: I also concurr with Rich Levinson
> > > 
> > > > In particular, the ValueType attribute (lines 702-708) appears to 
be
> > 
> > > > intended
> > > > to provide token-specific processing rules to be applied in 
> > > > conjunction with
> > > > the URI attribute. In the case of SAML 1.1 assertions, the SAML 
> > ValueType
> > > > indicates that the saml:AssertionID should be treated as an XML ID 

> > type
> > > > attribute.
> > > 
> > > >
> > > > Anthony Nadalin | work 512.838.0085 | cell 512.289.4122
> > > >
> > > 
> > > 
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> > of 
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> > > TC), go to 
> > 
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> >