Re: [stir] Proposal for update of erratum #6519 - ppt syntax

Christer Holmberg <christer.holmberg@ericsson.com> Thu, 22 April 2021 14:37 UTC

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From: Christer Holmberg <christer.holmberg@ericsson.com>
To: Marc Petit-Huguenin <marc@petit-huguenin.org>, Roman Shpount <roman@telurix.com>, Russ Housley <housley@vigilsec.com>
CC: IETF STIR Mail List <stir@ietf.org>
Thread-Topic: [stir] Proposal for update of erratum #6519 - ppt syntax
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Date: Thu, 22 Apr 2021 14:37:35 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/stir/4Q0OdgxkaqwMgl6FpD5Y1eye1xc>
Subject: Re: [stir] Proposal for update of erratum #6519 - ppt syntax
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No what?

________________________________
From: Marc Petit-Huguenin <marc@petit-huguenin.org>
Sent: Thursday, April 22, 2021 12:34 AM
To: Christer Holmberg <christer.holmberg@ericsson.com>om>; Roman Shpount <roman@telurix.com>om>; Russ Housley <housley@vigilsec.com>
Cc: IETF STIR Mail List <stir@ietf.org>
Subject: Re: [stir] Proposal for update of erratum #6519 - ppt syntax

No.

On 4/21/21 12:40 PM, Christer Holmberg wrote:
>>> I have not been able to follow the discussion in detail, but is there a reason why we simply can's say:
>>>
>>> ident-type = "ppt" EQUAL token / quoted-string
>>>
>>> ...and then add text saying that the only token characters are allowed?
>>
>> I believe that exceptions to ABNF should be kept to the minimal necessary.
>
> My suggestion is a subset of generic-param, which is the generic syntax for the parameters.
>
>> Few implementers read the ABNF, few implementers read normative text.  That means that only the intersection of these two sets will do the right thing.
>>
>> That's also why we should not deviate from the norm:  We should have used COMMA in Identity, ident-info-uri should have been a field right after signed->identity-digest (similar to name-addr).
>
> Perhaps, but that is not what the issue is about.
>
> Regards,
>
> Christer
>
>
>>
>>
>>
>> ________________________________
>> From: Roman Shpount <roman@telurix.com>
>> Sent: Tuesday, April 20, 2021 5:20 PM
>> To: Russ Housley <housley@vigilsec.com>
>> Cc: Marc Petit-Huguenin <marc@petit-huguenin.org>rg>; Christer Holmberg <christer.holmberg@ericsson.com>om>; IETF STIR Mail List <stir@ietf.org>
>> Subject: Re: [stir] Proposal for update of erratum #6519
>>
>> Hi Russ,
>>
>> The complete grammar would be:
>>
>>         Identity = "Identity" HCOLON signed-identity-digest SEMI
>>             ident-info *( SEMI ident-info-params )
>>         signed-identity-digest = 1*(base64url-char / ".")
>>         ident-info = "info" EQUAL ident-info-uri
>>         ident-info-uri = LAQUOT absoluteURI RAQUOT
>>         ident-info-params = ident-info-alg / ident-type /
>>             ident-info-extension
>>         ident-info-alg = "alg" EQUAL token
>>         ident-type =  "ppt" EQUAL ( token / ( LDQUOT token RDQUOT ) )
>>         ident-info-extension = generic-param
>>
>> base64url-char = ALPHA / DIGIT / "-" / "_"
>>
>> In this grammar, SEMI is defined as SEMI = SWS  ";"  SWS. This should take care of the SWS after the token.
>> _____________
>> Roman Shpount
>>
>>
>> On Tue, Apr 20, 2021 at 9:22 AM Russ Housley <housley@vigilsec.com<mailto:housley@vigilsec.com>> wrote:
>>
>>
>> On Apr 19, 2021, at 9:57 PM, Roman Shpount <roman@telurix.com<mailto:roman@telurix.com>> wrote:
>>
>> ident-type = "ppt" EQUAL ( token / ( LDQUOT token RDQUOT ) )
>>
>> Since RDQUOT allows whitespace after the double quote, do we need to allow whitespace after token when there are no quotes?
>>
>>       ident-type = "ppt" EQUAL ( ( token SWS ) / ( LDQUOT token RDQUOT ) )
>>
>> Russ
>>
>
>
> --
> Marc Petit-Huguenin
> Email: marc@petit-huguenin.org
> Blog: https://protect2.fireeye.com/v1/url?k=f5436fb7-aad856b2-f5432f2c-86959e472243-d9535674738af26e&q=1&e=7a194cb8-6230-48c3-b23f-d2e231acea1c&u=https%3A%2F%2Fmarc.petit-huguenin.org%2F
> Profile: https://www.linkedin.com/in/petithug
>


--
Marc Petit-Huguenin
Email: marc@petit-huguenin.org
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Profile: https://www.linkedin.com/in/petithug