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<p class="MsoNormal"><a name="_Hlk20486622">RFC 7231, section 6.4, says that the Location header SHOULD be present for status codes 301, 302, and 307; RFC 7238 says the same about status code 308. By stating that the target URI MUST come from the Location header,
we disallow following redirects by parsing the response body. At the same time, content-aware decisions are eliminated for status code 300, because the Location header only states the server’s preferred choice. If there is no preferred choice, this header
will not be present, and the redirect cannot be followed.<o:p></o:p></a></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk20486622"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk20486622">There is the separate issue that 300 and 303 redirects are not intended to represent the original resource. I’m not sure how this could be exploited in any way, but I can see why some might want to
exclude them for this reason.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk20486622"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-bookmark:_Hlk20486622"><b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter <br>
</span></b></span><span style="mso-bookmark:_Hlk20486622"></span><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#59595B">Software Engineer</span><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Ryan Sleevi <sleevi@google.com><br>
<b>Date: </b>Monday, June 22, 2020 at 13:21<br>
<b>To: </b>Niko Carpenter <NCarpenter@securetrust.com><br>
<b>Cc: </b>Tim Hollebeek <tim.hollebeek@digicert.com>, Validation List <validation@cabforum.org><br>
<b>Subject: </b>Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Right, but the issue with 300 is that it required CAs to make content-aware decisions about the acceptable resource to dereference, and that is the issue that's trying to be avoided here, because that leads to ambiguities again.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">301, 302, 307, and 308, as the set seemed to represent the use case of unambiguously and explicitly indicating the URLs.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Mon, Jun 22, 2020 at 2:09 PM Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com">NCarpenter@securetrust.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Ryan Sleevi <<a href="mailto:sleevi@google.com" target="_blank">sleevi@google.com</a>><br>
<b>Date: </b>Monday, June 22, 2020 at 12:35<br>
<b>To: </b>Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com" target="_blank">NCarpenter@securetrust.com</a>><br>
<b>Cc: </b>Tim Hollebeek <<a href="mailto:tim.hollebeek@digicert.com" target="_blank">tim.hollebeek@digicert.com</a>>, Validation List <<a href="mailto:validation@cabforum.org" target="_blank">validation@cabforum.org</a>><br>
<b>Subject: </b>Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">>> 2. Redirects MUST be the result of a 300, 301, 302, 303, 307, or 308 HTTP status code response. Other status codes MUST NOT be treated as being equivalent to the 300
status code.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> 300 was in the set we didn't want though. Was there something I was overlooking?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> If we exclude 300, the necessity of the second clause also disappears. If other status codes were treated equivalent to 300, it'd fall out as not permitted.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-size:10.5pt;font-family:"Apple Color Emoji"">I'm not married to 300 being included. The main purpose of this change is to enumerate the status codes from a set
whose s</span><span style="font-size:10.5pt;font-family:"Cambria",serif">e</span><span style="font-size:10.5pt;font-family:"Apple Color Emoji"">mantics we understand, while also preventing clients from parsing response bodies. By specifying that the target
URI must come from the Location header, I don't see why 300 and 303 should be excluded from this list. If the goal is to only include status codes that explicitly refer to that same resource at a different URI, then we should exclude both 300 and 303.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:.5in;text-indent:.5in;line-height:14.0pt">
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter <br>
</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#59595B">Software Engineer</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Tim Hollebeek <<a href="mailto:tim.hollebeek@digicert.com" target="_blank">tim.hollebeek@digicert.com</a>><br>
<b>Date: </b>Friday, April 24, 2020 at 15:55<br>
<b>To: </b>Ryan Sleevi <<a href="mailto:sleevi@google.com" target="_blank">sleevi@google.com</a>>, Validation List <<a href="mailto:validation@cabforum.org" target="_blank">validation@cabforum.org</a>>, Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com" target="_blank">NCarpenter@securetrust.com</a>><br>
<b>Subject: </b>RE: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Well, this isn’t a spring cleanup thing. Though it would be a good ballot. I’d be more than happy to support getting rid of 300; getting down to an explicit list of codes whose
semantics we have analyzed and approved would be even better. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Thanks for starting the discussion, Niko.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">-Tim<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b>From:</b> Validation <<a href="mailto:validation-bounces@cabforum.org" target="_blank">validation-bounces@cabforum.org</a>>
<b>On Behalf Of </b>Ryan Sleevi via Validation<br>
<b>Sent:</b> Friday, April 24, 2020 2:57 PM<br>
<b>To:</b> Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com" target="_blank">NCarpenter@securetrust.com</a>><br>
<b>Cc:</b> CABforum3 <<a href="mailto:validation@cabforum.org" target="_blank">validation@cabforum.org</a>><br>
<b>Subject:</b> Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I don't disagree that it'd be a normative change, for sure. But adding the entire IANA registry is sort of like the "any other method", and much of the discussion in the validation
WG was about concerns of using content-aware redirects (which, functionally, 300 is, as it's dependent upon the UA/client understanding the media type)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Definitely, more feedback from more CAs would be good here. For example, 303 is not entirely unreasonable, but I think it'd have to be coupled with a more normative protocol descriptor
ala ACME to evaluate.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">And with 308, we have to make sure the client actually understands 308 semantics, so that it doesn't fall back into a 300-style content-aware parse (for which the canonical example
is a meta-refresh, which folks understandably wanted to prohibit)<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Fri, Apr 24, 2020 at 2:50 PM Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com" target="_blank">NCarpenter@securetrust.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><a name="m_873828918156317444_m_55218076836111286">I’m not opposed to restricting redirects to the 301, 302, 307, and 308 status codes. However, doing so would be a normative change,
since 300 and 303 are not currently disallowed. Some Cas might already be following them, if they are relying on an HTTP client library to handle redirects in the manner described in RFC 7231, Section 6.4.
</a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:.5in;text-indent:.5in;line-height:14.0pt">
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter <br>
</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#59595B">Software Engineer</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Ryan Sleevi <</span><a href="mailto:sleevi@google.com" target="_blank"><span style="font-size:12.0pt">sleevi@google.com</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Date: </b>Friday, April 24, 2020 at 12:10<br>
<b>To: </b>Niko Carpenter <</span><a href="mailto:NCarpenter@securetrust.com" target="_blank"><span style="font-size:12.0pt">NCarpenter@securetrust.com</span></a><span style="font-size:12.0pt;color:black">>, Validation List <</span><a href="mailto:validation@cabforum.org" target="_blank"><span style="font-size:12.0pt">validation@cabforum.org</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Subject: </b>Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Right, that's why I proposed 301, 302, 307, and 308. The motivation for that is basically covered in RFC 7538 Section 1, and what you reach when you go through 7231: 305 / 306 are
retired, and 300 requires parsing the body to semantically extract which choice.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Fri, Apr 24, 2020 at 12:53 PM Niko Carpenter via Validation <<a href="mailto:validation@cabforum.org" target="_blank">validation@cabforum.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">While I don’t think it’s worth calling out specifically in the BRs, CAs definitely should not be parsing response bodies to discern redirect URLs.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter <br>
</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#59595B">Software Engineer </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Ryan Sleevi <</span><a href="mailto:sleevi@google.com" target="_blank"><span style="font-size:12.0pt">sleevi@google.com</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Date: </b>Friday, April 24, 2020 at 10:49<br>
<b>To: </b>Niko Carpenter <</span><a href="mailto:NCarpenter@securetrust.com" target="_blank"><span style="font-size:12.0pt">NCarpenter@securetrust.com</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Subject: </b>Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">How do you propose CAs handle 300?<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Fri, Apr 24, 2020 at 11:44 AM Niko Carpenter <<a href="mailto:NCarpenter@securetrust.com" target="_blank">NCarpenter@securetrust.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">I think it would be best to reference the IANA registry, so that we don’t need to draft a new ballot if a new status code is created. I propose replacing the following<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> Redirects MUST be the result of an HTTP status code result within the 3xx Redirection class of status codes, as defined in RFC 7231, Section 6.4.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">With<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">> Redirects MUST be the result of an HTTP status code result within the 3xx Redirection class of status codes, as registered in the IANA HTTP Status Code Registry.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;margin-bottom:12.0pt;margin-left:.5in;line-height:14.0pt">
<b><span style="font-size:12.0pt;font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter <br>
</span></b><span style="font-size:10.5pt;font-family:"Arial",sans-serif;color:#59595B">Software Engineer </span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Ryan Sleevi <</span><a href="mailto:sleevi@google.com" target="_blank"><span style="font-size:12.0pt">sleevi@google.com</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Date: </b>Thursday, April 23, 2020 at 12:02<br>
<b>To: </b>Niko Carpenter <</span><a href="mailto:NCarpenter@securetrust.com" target="_blank"><span style="font-size:12.0pt">NCarpenter@securetrust.com</span></a><span style="font-size:12.0pt;color:black">>, Validation List <</span><a href="mailto:validation@cabforum.org" target="_blank"><span style="font-size:12.0pt">validation@cabforum.org</span></a><span style="font-size:12.0pt;color:black">><br>
<b>Subject: </b>Re: [cabf_validation] Clarifying Acceptable Status Codes for Following Redirects in methods 18 and 19</span><o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To clarify: The "intention" aspect is because the status codes in 6.4 are used to establish a new IANA registry (in Section 8.2 of RFC 7231), which RFC 7238, Section 6 then updates.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Did you mean to reference <a href="https://scanmail.trustwave.com/?c=4062&d=o_bw3soodwo9BhdUDQsT8jtYKUiaIji31aulNlaWtg&s=5&u=https%3a%2f%2ftools%2eietf%2eorg%2fhtml%2frfc7538" target="_blank">https://tools.ietf.org/html/rfc7538</a> though?
That's updated (in both the IANA registry and in the IETF) as being the standards-track version of 308.<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Are you thinking it's better to clarify that 301, 302, 307, and 308 are permitted, or to reference the IANA registry so that 300 and 303 are also permitted? <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Thu, Apr 23, 2020 at 12:45 PM Niko Carpenter via Validation <<a href="mailto:validation@cabforum.org" target="_blank">validation@cabforum.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Methods 3.3.2.4.18 and 3.2.2.4.19, added in ballot SC25, say "Redirects MUST be the result of an HTTP status code result within the 3xx Redirection class of status codes, as defined
in RFC 7231, Section 6.4." While I believe the intention was that following a 308 redirect should be acceptable, RFC 7231 does not define it. Instead, it mentions, in section 6.4.7, that it is defined in RFC 7238. I think we should clarify that following
a 308 redirect is acceptable in a new ballot, or the spring cleanup ballot.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<b><span style="font-family:"Arial",sans-serif;color:#008FC5">Niko Carpenter</span></b><o:p></o:p></p>
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