Re: [secdir] secdir review of draft-ietf-v6ops-ipv6-cpe-router
Ole Troan <ot@cisco.com> Wed, 11 August 2010 11:59 UTC
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From: Ole Troan <ot@cisco.com>
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Cc: cpe-router@external.cisco.com, Chris Donley <C.Donley@cablelabs.com>, draft-ietf-v6ops-ipv6-cpe-router.all@tools.ietf.org, secdir@ietf.org
Subject: Re: [secdir] secdir review of draft-ietf-v6ops-ipv6-cpe-router
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Scott et al, I'm not entirely sure what the process here is. do you want to see a new revision of the draft incorporating Scott's comments as well as the feedback we have received from the DHC WG review before we proceed to the IESG review? cheers, Ole > Hi Chris, > > I think your suggestions are reasonable. > > --Scott > > > On Thursday, August 5, 2010 8:00am, "Chris Donley" <C.Donley@cablelabs.com> said: > >> Scott, >> >> If we were to make the following changes to the security section, would they >> address your concerns? >> >> It is considered a best practice to filter obviously malicious >> traffic (e.g. spoofed packets, "martian" addresses, etc.). Thus, the >> IPv6 CE router should ought to support basic stateless egress and ingress >> filters. The CE router should is also expected to offer mechanisms to filter >> traffic entering the customer network; however, the method by which >> vendors implement configurable packet filtering is beyond the scope >> of this document. >> >> Security requirements: >> >> S-1: The IPv6 CE router SHOULD support >> [I-D.ietf-v6ops-cpe-simple-security]. In particular, the IPv6 CE router >> SHOULD support functionality sufficient for implementing the set of >> recommendations in [I-D.ietf-v6ops-cpe-simple-security] Section 4. This >> document takes no position on whether such functionality is enabled by >> default or mechanisms by which users would configure it. >> >> S-2: The IPv6 CE router MUST support ingress filtering in accordance >> with [RFC2827] (BCP 38) >> >> >> Also, since we're so late in the process, my preference would be to specify device >> security as part of our Phase 2 draft (scheduled to start work on 8/13). Would >> you have any issue with that? >> >> Chris >> >> -----Original Message----- >> From: Scott G. Kelly [mailto:scott@hyperthought.com] >> Sent: Tuesday, August 03, 2010 3:32 PM >> To: Ole Troan >> Cc: secdir@ietf.org; iesg@ietf.org; >> draft-ietf-v6ops-ipv6-cpe-router.all@tools.ietf.org; >> cpe-router@external.cisco.com >> Subject: Re: secdir review of draft-ietf-v6ops-ipv6-cpe-router >> >> Hi Ole, >> >> On Monday, August 2, 2010 5:58am, "Ole Troan" <ot@cisco.com> said: >> >> <trimmed...> >>> >>>> The security considerations section begins with a paragraph stating that basic >>>> stateless egress and ingress filters should be supported (lowercase "should"), >>>> and goes on to say that the CE router should offer mechanisms to filter traffic >>>> entering the customer network, but that how these are implemented is out of >>>> scope >>>> (lowercase "should"). >>> >>> we tried to limit RFC2119 language to only the numbered requirements. the >>> initial >>> paragraph is only to set the stage for the more detailed requirements below. >>> basically just saying that the CPE should support a packet filtering capability. >>> but from a security point of view I'm not sure if we can state this in very much >>> more concrete terms? >> >> Okay, I guess it makes more sense when viewed as introductory text for the >> numbered requirements. >> >>>> Then, it has the following statements: >>>> >>>> Security requirements: >>>> >>>> S-1: The IPv6 CE router SHOULD support >>>> [I-D.ietf-v6ops-cpe-simple-security]. >>>> >>>> S-2: The IPv6 CE router MUST support ingress filtering in accordance >>>> with [RFC2827] (BCP 38) >>>> >>>> When I first read this, I thought the statements in the first paragraph were >>>> somewhat weak and imprecise, as they don't use RFC2119 language. When I read >>>> draft-ietf-v6ops-cpe-simple-security-12.txt, I thought that document gives a >>>> relatively thorough treatment of security considerations, but I'm not sure what >>>> it means to say "The IPv6 CE router SHOULD support" it. >>> >>> the intention was to state the the CPE router should have the capability of >>> doing >>> the functions described in the simple security draft. but we did not want to >>> make >>> any recommendation what the default should be. I believe recommending that >>> simple >>> security is enabled by default in a CPE routers would violate the Internet >>> architecture principles. would it help if we changed the text to: >>> >>> S-1: The IPv6 CE router SHOULD support the [I-D.ietf-v6ops-cpe-simple-security]. >>> This functionality MUST be user configurable and this >>> specification makes no recommendation what the default setting should >>> be. >> >> Since the referenced draft is informational and does not mandate any behavior (it >> only makes non-binding recommendations), I'm still confused about what it means to >> "support" it - it seems very difficult to pin down. Do you mean that these devices >> MUST provide knobs for all capabilities defined there, or just some of them (and >> if so, which ones)? >> >> Since both of these documents are informational, perhaps it doesn't matter, but it >> seems like we'd be doing the user community a better service if we took a definite >> position on baseline security requirements for these devices. >> >> <more trimmed...> >>> while on the topic of security. we should perhaps have said something more about >>> device security. as in requirements for access to the device itself. today many >>> of >>> these routers allow telnet and http access, more often than not with default >>> password. where they also make a distinction between 'inside' and 'outside', >>> which >>> some recent attacks have taken advantage of. >> >> The simple security document does reference management applications (section 3.5), >> but only states that they should not be accessible on the WAN interface by >> default. It might be worthwhile to update it according to your thoughts above. >> >> --Scott >> >> >> >> > >
- [secdir] secdir review of draft-ietf-v6ops-ipv6-c… Scott G. Kelly
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Scott G. Kelly
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Ole Troan
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Scott G. Kelly
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Chris Donley
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Ole Troan
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Fred Baker
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Fred Baker
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Ole Troan
- Re: [secdir] secdir review of draft-ietf-v6ops-ip… Ole Troan