Re: [secdir] sec-dir review of draft-ietf-siprec-architecture-08
"Hutton, Andrew" <andrew.hutton@unify.com> Thu, 24 October 2013 15:38 UTC
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From: "Hutton, Andrew" <andrew.hutton@unify.com>
To: Derek Atkins <derek@ihtfp.com>
Thread-Topic: sec-dir review of draft-ietf-siprec-architecture-08
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Date: Thu, 24 Oct 2013 15:36:57 +0000
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Cc: "siprec-chairs@tools.ietf.org" <siprec-chairs@tools.ietf.org>, "secdir@ietf.org" <secdir@ietf.org>, "krehor@cisco.com" <krehor@cisco.com>, "iesg@ietf.org" <iesg@ietf.org>, "leon.portman@gmail.com" <leon.portman@gmail.com>, "rajnish.jain@outlook.com" <rajnish.jain@outlook.com>
Subject: Re: [secdir] sec-dir review of draft-ietf-siprec-architecture-08
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Hi Derek, I am ok with putting something in the security considerations to say the key management requirements for storage and retrieval is something that the recording system will need to consider but I would still say that saying anything more than that is out of scope. What do others think? Andy > -----Original Message----- > From: Derek Atkins [mailto:derek@ihtfp.com] > Sent: 24 October 2013 15:53 > To: Hutton, Andrew > Cc: Derek Atkins; iesg@ietf.org; secdir@ietf.org; siprec- > chairs@tools.ietf.org; krehor@cisco.com; rajnish.jain@outlook.com; > leon.portman@gmail.com > Subject: Re: sec-dir review of draft-ietf-siprec-architecture-08 > > Hi Andrew, > > Sorry for the delay in responding. > > I personally feel that there is a big difference between the > interactive, real-time SIP components versus a service that is > specifically designed to record and replay content later. The key > management of the real-time components is all immediate, there is no > storage required, once the keys get to the endpoints you're done and > all > you do is transmit encrypted content. > > However a storage system has significantly different requirements. It > has to store the keys that protect the content, and it must store those > keys securely. It then has to be able to securely distribute those > keys > only to authorized receipients. > > So yes, I think it is important to talk about at least the requirements > for what the recording agent MUST do, even if you don't necessarily > specify HOW the agent must do it. E.g. I think it's okay to say > something like "the stored content must be protected using a cipher at > least as strong (or stronger) than the original content" -- i.e., you > don't need to specify "you MUST use AES-256". Yet I still think you > need to talk about the key management requirements of the storage (and > more importantly retrieval). > > Thanks, > > -derek > > "Hutton, Andrew" <andrew.hutton@unify.com> writes: > > > Hi Derek, > > > > Thanks for your comment and sorry for taking a while to get back to > you. > > > > The security considerations section contains the following text: > > > > " It is the responsibility of the Session Recording Server to protect > > the Replicated Media and Recording Metadata once it has been > received > > and archived. The mechanism for protecting the storage and > retrieval > > from the SRS is out of scope of this work." > > > > > > Personally I think this is reasonable as we never say anything in SIP > > related specifications what a UA should do with the media once it has > > been received and this work is all about delivering the media and > > related metadata to the recording system not what it does with it > > afterwards. > > > > Is it really necessary to go any further than this? > > > > Regards > > Andy (SIPREC Co-Chair). > > > > > > > > > >> -----Original Message----- > >> From: Derek Atkins [mailto:derek@ihtfp.com] > >> Sent: 01 October 2013 16:34 > >> To: iesg@ietf.org; secdir@ietf.org > >> Cc: siprec-chairs@tools.ietf.org; krehor@cisco.com; > >> rajnish.jain@outlook.com; leon.portman@gmail.com; Hutton, Andrew > >> Subject: sec-dir review of draft-ietf-siprec-architecture-08 > >> > >> Hi, > >> > >> I have reviewed this document as part of the security directorate's > >> ongoing effort to review all IETF documents being processed by the > >> IESG. These comments were written primarily for the benefit of the > >> security area directors. Document editors and WG chairs should > treat > >> these comments just like any other last call comments. > >> > >> Session recording is a critical requirement in many > communications > >> environments such as call centers and financial trading. In some > of > >> these environments, all calls must be recorded for regulatory, > >> compliance, and consumer protection reasons. Recording of a > session > >> is typically performed by sending a copy of a media stream to a > >> recording device. This document describes architectures for > >> deploying session recording solutions in an environment which is > >> based on the Session Initiation Protocol (SIP). > >> > >> Retrieving recorded media is a potential Key Management problem > which > >> this document completely ignores (and even claims is out of scope). > >> The key used to encrypt the recorded media (whether or not the media > >> is re-encrypted) must be stored and retrieved as part of the media > >> retrieval. How this important data is stored and retrieved is left > >> out, leaving an implementation with no guidance on how to protect > that > >> valuable asset. In fact the document completely elides the question > >> of how a retriever obtains the data encryption key. Even if it's > just > >> additional guidance the Security Considerations should at least > >> explain the problem even if it doesn't provide a solution. > >> > >> -derek > >> > >> -- > >> Derek Atkins 617-623-3745 > >> derek@ihtfp.com www.ihtfp.com > >> Computer and Internet Security Consultant > > > > > > -- > Derek Atkins 617-623-3745 > derek@ihtfp.com www.ihtfp.com > Computer and Internet Security Consultant
- [secdir] sec-dir review of draft-ietf-siprec-arch… Derek Atkins
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Hutton, Andrew
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Derek Atkins
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Hutton, Andrew
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Raj Jain
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Hutton, Andrew
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Derek Atkins
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Hutton, Andrew
- Re: [secdir] sec-dir review of draft-ietf-siprec-… Hutton, Andrew