Re: [secdir] Early SecDir Reviews

Joel Halpern <joel.halpern@ericsson.com> Mon, 24 August 2015 20:05 UTC

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From: Joel Halpern <joel.halpern@ericsson.com>
To: Russ Housley <housley@vigilsec.com>, Susan Hares <shares@ndzh.com>
Thread-Topic: Early SecDir Reviews
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Date: Mon, 24 Aug 2015 20:05:26 +0000
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Subject: Re: [secdir] Early SecDir Reviews
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Hannes is probably correct that we mean identifier, not identity, in almost all cases in the document.

In particular, regarding primary and secondry identifier, the secondary identifier is NOT used for any security decisions.  Access control is based only on the primary identifier.

Yours,
Joel

-----Original Message-----
From: Russ Housley [mailto:housley@vigilsec.com] 
Sent: Monday, August 24, 2015 3:27 PM
To: Susan Hares
Cc: draft-mglt-i2rs-security-requirements.all@ietf.org; draft-hares-i2rs-auth-trans.all@ietf.org; 'Stephen Farrell'; 'Kathleen Moriarty'; 'IETF SecDir'
Subject: Re: Early SecDir Reviews

Sue:

> 1) Is REQ-8 a security requirement? 
> 
>   o  SEC-REQ-08: Each Identity is associated with one secondary
>      identity during a particular read/write sequence, but the
>      secondary identity may vary during the time a connection between
>      the I2RS client and I2RS agent is active.  The variance of the
>      secondary identity allows the I2rs client to be associated with
>      multiple applications and pass along an identifier for these
>      applications in the secondary identifier.

Yes, if that identity is going to be used to make the access control decision.

> 2) Is REQ-12 - a security requirement for a protocol?  NETCONF asked 
> this of I2RS.
> 
>   SEC-REQ-12: The I2RS Client and I2RS Agent protocol SHOULD implement
>   mechanisms that mitigate DoS attacks

Yes.  For example, the IKE cookie mechanism is only there to make it much more expensive the an attacker ti implement DDoS.  They can't fire and forget.  They need to keep state and hang around for at least 1.5 round trips.

> 3) Section 2.4.1 - is a description of the what happens when multiple 
> changes occur via multiple messages.
> 
> My understanding from your question is that the implementation of how 
> an I2RS Agent processes the changes (change1, change2, change3) that 
> occur in multiple messages is not a security issue, but a 
> implementation issue.  If so, Please let me know.

There might be some protocol issues to assist keep things atomic, but I agree it i not a security issue.

> 4) Are you Ok with REQ-09 specifying a non-secure transport as an option? 

The security considerations need to be clear what the consequences are if this option is selected.

Russ