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Re: [IPsec] draft-pauly-ipsecme-split-dns

Paul Wouters <paul@nohats.ca> Tue, 19 June 2018 19:03 UTC

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Date: Tue, 19 Jun 2018 15:02:29 -0400
From: Paul Wouters <paul@nohats.ca>
To: Nico Williams <nico@cryptonector.com>
cc: Eric Rescorla <ekr@rtfm.com>, IPsecME WG <ipsec@ietf.org>, "draft-ietf-ipsecme-split-dns.all@ietf.org" <draft-ietf-ipsecme-split-dns.all@ietf.org>, "Waltermire, David A. (Fed)" <david.waltermire@nist.gov>, Tero Kivinen <kivinen@iki.fi>
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Subject: Re: [IPsec] draft-pauly-ipsecme-split-dns
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On Tue, 19 Jun 2018, Nico Williams wrote:

> The I-D should say that clients MUST allow local configuration of what
> domains to accept trust anchors for, and SHOULD allow local policy to
> list . as a domain for which to accept trust anchors.

It already says so:

    If a client is configured by local policy to only accept a limited
    number of INTERNAL_DNS_DOMAIN values, the client MUST ignore any
    other INTERNAL_DNS_DOMAIN values.

However, "limited number" is confusing and it should be reworded to say
"to only accept certain specific domain names"

>> 2. Because the current design also allows those trust anchors to sign TLSA
>> records, any TLS client which accepts those TLSA records is subject to MITM
>> by the VPN server
>
> And SSHFP.  And anything else that might be security-relevent (all of
> DNS, really).
>
> This definitely merits a Security Considerations note even if this
> property were actually the point of this protocol.

That is all stated in section 6:

https://tools.ietf.org/html/draft-ietf-ipsecme-split-dns-08#section-6

Paul

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