Re: [plasma] Clarification of how client applications handle the LockBox in client in <plasma:GetCMSToken> elements
Ed Simon <Ed.Simon@titus.com> Thu, 04 October 2012 02:03 UTC
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From: Ed Simon <Ed.Simon@titus.com>
To: Jim Schaad <jimsch@nwlink.com>, "plasma@ietf.org" <plasma@ietf.org>
Thread-Topic: [plasma] Clarification of how client applications handle the LockBox in client in <plasma:GetCMSToken> elements
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Date: Thu, 04 Oct 2012 02:03:00 +0000
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Subject: Re: [plasma] Clarification of how client applications handle the LockBox in client in <plasma:GetCMSToken> elements
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Thanks Jim, That does help clarify the specifications. For additional clarity, I think it might be helpful, for each of the scenarios you list, and the one where the client agent specifies both recipientInfos and the content encryption key (the spec indicates both may be specified in the same Send request, though in some ways they seem mutually exclusive), to have a specific list of steps with each step pointing to which sections of the two specifications are applicable. Ed ________________________________________ From: Jim Schaad [jimsch@nwlink.com] Sent: Tuesday, September 25, 2012 16:33 To: Ed Simon; plasma@ietf.org Subject: RE: [plasma] Clarification of how client applications handle the LockBox in client in <plasma:GetCMSToken> elements I apologize for the delay, I have been doing more traveling than I expected. Would the following text make things clearer? \ Jim When sending a Plasma enabled message, there are three different classes of recipients that need to be considered. The information sent for these three classes differs. The three classes are: 1. No Policy Protection - These recipients are those for which no Plasma policy protection is to be applied. Often times the sender of the message will fall into this class of recipient. For recipients in this class the Plasma server is not involved, the sender creates a lock box as if the Plasma server was not present and places the lock box in to the recipient info structure as normal. 2. Policy protected for a specific recipient - This case exists to allow a message to be policy protected, but also not allow the policy server to any access to the message. For recipients of this class access can be denied to existing recipients by the Plasma server, but new recipients cannot be added to the list. For recipients in this class, the sender agent builds a normal recipient info structure for the recipient, but instead of placing it in the message direct, it is given to the Plasma server along with the policy to be satisfied before the lock box is released to the recipient. The Plasma server includes this recipient inside of the Plasma lock box which is returned to the sender for inclusion in the recipient info structure. 3. Policy Protected generic recipient - These recipients are those for which the inclusion in the group of individuals able to decrypt the message is based solely on the policy. For these recipients, the sender supplies the Plasma server with the policy to be applied for inclusion as a recipient and the content encryption key. The server then returns this information in it's Plasma encrypted lock box for inclusion in the recipient info structure. This recipient class must be used if a server is going to do pre-approval of recipients as described in section XXX of [Requirements]. > -----Original Message----- > From: plasma-bounces@ietf.org [mailto:plasma-bounces@ietf.org] On > Behalf Of Ed Simon > Sent: Thursday, September 13, 2012 6:12 PM > To: plasma@ietf.org > Subject: [plasma] Clarification of how client applications handle the LockBox > in client in <plasma:GetCMSToken> elements > > I would like to see the clarification of how client applications handle the > LockBox. In section 8.1.1 of Plasma Service Trust Processing, which describes > the XML request created by the client which is sent to the server prior to > creating the email's CMS form, it states that the LockBox is a "base64 > encoded Recipient Info structure", but in section 3, Encoding Recipient Info, > of Plasma Service CMS Processing (the only place I see a sufficiently detailed > description of encoding PLASMA RecipientInfo structures), it says "A > recipient info structure as defined in this document MUST be created by a > Plasma server and MUST NOT be created by client software". I can see the > latter making sense in RecipientInfo structures returned by the server to the > client, but not in the client request for the CMS token. The question remains > then what is supposed to go into the LockBox in the sending client's CMS > token XML request. > > If it is the PLASMA-LockBox ASN.1 structure described in section 3.2 of > Plasma Service CMS Processing, then more clarity is needed as to exactly > what the client should send to the PLASMA server in a CMS token request > (e.g. is it everything but the RecipientInfo blob in the PLASMA-LockBox > structure?, if labels and recipient names are already specified in XML in the > CMS token request, does/should the client really need to create label and > NamedRecipient structures in the PLASMA-LockBox? (I suspect not)). > > Ed > _______________________________________________ > plasma mailing list > plasma@ietf.org > https://www.ietf.org/mailman/listinfo/plasma
- [plasma] Clarification of how client applications… Ed Simon
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Trevor Freeman
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Trevor Freeman
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Ed Simon
- Re: [plasma] Clarification of how client applicat… Trevor Freeman
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Jim Schaad
- Re: [plasma] Clarification of how client applicat… Trevor Freeman
- Re: [plasma] Clarification of how client applicat… Trevor Freeman