Alexey Melnikov
2016-04-08 18:29:52 UTC
Alexey Melnikov has entered the following ballot position for
draft-ietf-p2psip-sip-18: Discuss
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for more information about IESG DISCUSS and COMMENT positions.
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DISCUSS:
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I will move to No Objection once my comments are discussed. They should
be easy to address.
In Section 7:
Access Control USER-NODE-MATCH. Note that this matches the SIP
AOR
against the rfc822Name in the X509v3 certificate. The rfc822Name
does not include the scheme so that the "sip:" prefix needs to be
removed from the SIP AOR before matching.
In general the advice of stripping "sip:" is misleading, because URIs
might have %-encoding, which is not present in rfc822Name, which is an
email address. I think adding text that %-encoding should be decoded
would be a good idea.
Also, the first reference to rfc822Name (earlier in the document) needs a
normative reference to RFC 5280.
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COMMENT:
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In 3.2:
If the registration is of type "sip_registration_uri", then the
contents are an opaque string containing the AOR as specified in
Section 2.
Is the reference correct? Section 2 is "Terminology".
What does "opaque string" means here? You still need to define syntax of
the field.
In 3.3:
Before a Store is permitted, the storing peer MUST check that:
o The AOR of the request is a valid Resource Name with respect to
the namespaces defined in the overlay configuration document.
o The certificate contains a username that is a SIP AOR which hashes
to the Resource-ID it is being stored at.
o The certificate contains a Node-ID that is the same as the
dictionary key it is being stored at.
Is there a document that defines how exactly a username and a Node-ID can
be represented in an X.509 certificate? If yes, adding a normative
reference here would be useful. If not, adding specific details here
would be useful.
On page 10:
Inclusion of a <domain-restrictions> element in an overlay
configuration document is OPTIONAL. If the element is not included,
the default behavior is to accept any AOR. If the element is
included and the "enable" attribute is not set or set to false, the
overlay MUST only accept AORs that match the domain name of the
overlay.
What happens if "enable" is false/unspecified and patter subelements are
included? Are they ignored?
The <domain-restrictions> element serves as a container for zero to
multiple <pattern> sub-elements. A <pattern> element MAY be present
if the "enable" attribute of its parent element is set to true. Each
<pattern> element defines a pattern for constructing admissible
resource names. It is of type xsd:string and interpreted as a
regular expression according to "POSIX Extended Regular Expression"
(see the specifications in [IEEE-Posix]).
This repeats part of the second paragraph of the same section. Is this
repetition needed?
draft-ietf-p2psip-sip-18: Discuss
When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)
Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.
The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-p2psip-sip/
----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------
I will move to No Objection once my comments are discussed. They should
be easy to address.
In Section 7:
Access Control USER-NODE-MATCH. Note that this matches the SIP
AOR
against the rfc822Name in the X509v3 certificate. The rfc822Name
does not include the scheme so that the "sip:" prefix needs to be
removed from the SIP AOR before matching.
In general the advice of stripping "sip:" is misleading, because URIs
might have %-encoding, which is not present in rfc822Name, which is an
email address. I think adding text that %-encoding should be decoded
would be a good idea.
Also, the first reference to rfc822Name (earlier in the document) needs a
normative reference to RFC 5280.
----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------
In 3.2:
If the registration is of type "sip_registration_uri", then the
contents are an opaque string containing the AOR as specified in
Section 2.
Is the reference correct? Section 2 is "Terminology".
What does "opaque string" means here? You still need to define syntax of
the field.
In 3.3:
Before a Store is permitted, the storing peer MUST check that:
o The AOR of the request is a valid Resource Name with respect to
the namespaces defined in the overlay configuration document.
o The certificate contains a username that is a SIP AOR which hashes
to the Resource-ID it is being stored at.
o The certificate contains a Node-ID that is the same as the
dictionary key it is being stored at.
Is there a document that defines how exactly a username and a Node-ID can
be represented in an X.509 certificate? If yes, adding a normative
reference here would be useful. If not, adding specific details here
would be useful.
On page 10:
Inclusion of a <domain-restrictions> element in an overlay
configuration document is OPTIONAL. If the element is not included,
the default behavior is to accept any AOR. If the element is
included and the "enable" attribute is not set or set to false, the
overlay MUST only accept AORs that match the domain name of the
overlay.
What happens if "enable" is false/unspecified and patter subelements are
included? Are they ignored?
The <domain-restrictions> element serves as a container for zero to
multiple <pattern> sub-elements. A <pattern> element MAY be present
if the "enable" attribute of its parent element is set to true. Each
<pattern> element defines a pattern for constructing admissible
resource names. It is of type xsd:string and interpreted as a
regular expression according to "POSIX Extended Regular Expression"
(see the specifications in [IEEE-Posix]).
This repeats part of the second paragraph of the same section. Is this
repetition needed?