Re: secdir review of draft-ietf-mpls-rfc6374-udp-return-path
Stewart Bryant <stewart.bryant@gmail.com> Thu, 07 April 2016 14:16 UTC
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Subject: Re: secdir review of draft-ietf-mpls-rfc6374-udp-return-path
To: Sandra Murphy <sandy@tislabs.com>, secdir@ietf.org, The IETF <ietf@ietf.org>, draft-ietf-mpls-rfc6374-udp-return-path.all@tools.ietf.org
References: <07A977A4-FD9E-4669-A8D0-7644131E06AD@tislabs.com> <5673D89F.7090409@gmail.com>
From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Thu, 07 Apr 2016 15:16:16 +0100
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On 18/12/2015 09:57, Stewart Bryant wrote: Sandy, I have looked at this discussion again. Please see inline: > >> >> Section 4.2 >> >> >> If an Out-of-band response is requested and the Address object or the >> URO is missing, the query SHOULD be dropped in the case of a >> unidirectional LSP. If both these TLVs are missing on a >> bidirectional LSP, the control code of Response message should set to >> 0x1C indicating "Error - Invalid Message" ([RFC6374] Section 3.1) and >> the response SHOULD be sent over the reverse LSP. The receipt of >> such a mal-formed request SHOULD be notified to the operator through >> the management system, taking the normal precautions with respect to >> the prevention of overload of the error reporting system. >> >> The first sentence says that both the Address object and the URO must >> be present or the query is dropped - right? I'm reading this as >> >> (if not(Address) OR not(URO)) then drop. >> >> What Address object - there are three - Return, Source and >> Destination. I'm betting on Return, but the text should be clear. > > That is return address - I will update the text. Looking at the text again, since we are ONLY talking about systems using the URO, the Address object text fragment is pointless so I have deleted it. > > >> >> The RFC6374 out-of-band response feature and the "Return Address" >> object seem to indicate the potential exists in RFC6374 as well. >> RFC6374's security consideration section does not mention the >> reflection attack possibility, only the integrity of the return >> out-of-band path and the possibility of affecting the validity of the >> measurements. But even if the assumptions of well-managed, private, >> service provider networks are met, I believe that the potential and >> increased need for careful configuration should be mentioned. "Note: >> the feature can be misused, so take care". Perhaps a manageability >> section caution about checking the Return Address or URO to ensure >> addresses are within the private or service provider network. >> something? Or presume all will be well, because this is to be used in >> well managed private and service provider networks? > I will look at adding some text, although the assumption is that > MPLS networks are well managed, and there are many other ways > they would break if they were not. > This text is only about the URO case. The only residual text on the DA obj is in the section that is to be deleted. - Stewart
- secdir review of draft-ietf-mpls-rfc6374-udp-retu… Sandra Murphy
- Re: secdir review of draft-ietf-mpls-rfc6374-udp-… Stewart Bryant
- Re: secdir review of draft-ietf-mpls-rfc6374-udp-… Stewart Bryant