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Re: [rtcweb] A couple of questions on SDP Identity attribute

Christer Holmberg <christer.holmberg@ericsson.com> Sat, 13 October 2018 17:34 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Cullen Jennings <fluffy@iii.ca>
CC: RTCWeb IETF <rtcweb@ietf.org>
Thread-Topic: [rtcweb] A couple of questions on SDP Identity attribute
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Date: Sat, 13 Oct 2018 17:34:06 +0000
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Subject: Re: [rtcweb] A couple of questions on SDP Identity attribute
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Hi,

>> Q1: In an offer or answer, it allowed to include fingerprints that have
>> NOT been used to assert the identity?
>
>Yes, I think they should because fingerprints can be used even if Identity is not.

In that case, I think the following text (Section 5.4.6.1.) is wrong:

   "The identity attribute attests to all "a=fingerprint" attributes in
   the session description.  It is therefore a session-level attribute.

   Multiple "a=fingerprint" values can be used to offer alternative
   certificates for a peer.  The "a=identity" attribute MUST include all
   fingerprint values that are included in "a=fingerprint" lines of the
   session description."

In my opinion it clearly states that every fingerprint attribute is associated with the identity attribute, and it is not allowed to include fingerprint attributes that are not associated with the identity attribute.

Regards,

Christer

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