On Feb 22, 2019, at 7:47 PM, Arran Cudbard-Bell <a.cudba...@freeradius.org> 
wrote:
> 
> 
>> In my opinion, the document MUST give guidance for implementors and site 
>> administrators:
>> 
>> * if resumption is used, the implementation MUST cache sufficient 
>> information for the system to make appropriate policy decisions on resumption
> 
> Maybe something about not relying on the outer identity to apply any kind of 
> autz policies?  Administrators may assume some kind of binding between the 
> outer identity, the original session, and the resumed session, and assume 
> it'll be consistent. In reality the user can provide any outer identity they 
> like.

  Yes.  The NAI document discusses this situation:

https://tools.ietf.org/html/rfc7542#section-4.2

  That discussion unfortunately doesn't discuss resumption.

> I know this is covered by the above point, but I feel it's worth documenting 
> this case explicitly.

  Yes.  An explicit reference to the above section would help.

>> * resumption MUST be rejected if no cached information is available, as we 
>> have no idea what policies to apply
> 
> I'd argue if cached information is expected and non is available, resumption 
> MUST be rejected.  For the majority of cases the security policies applied to 
> the different TLS based EAP methods will be identical.

  Yes, that has to happen, too.

  Alan DeKok.

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