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<p class="MsoNormal"><a name="_MailEndCompose"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Our recommendation is to add multi-party authentication to all offline root CA access requirements. Allow two-person control for physical
and logical system access and certificate issuance on offline CAs. In U.S. Federal government, we have to comply with NIST 800-53 audits and most of the MFA solutions require additional VMs to operate (i.e. key servers, domain controllers, etc.). Adding additional
VMs require implementing additional compensating controls which make simple offline configurations untenable.<o:p></o:p></span></a></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">With your HSM example, is that also assuming MFA to the OS? Is the intent for MFA to increase assurance in issuing a certificate or for system access or both?<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;font-family:"Verdana",sans-serif;color:black">Kenneth Myers</span></b><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black"><br>
Manager<br>
+1.571.366.6120 Desk<br>
Protiviti | 1640 King Street | Suite #400 | Alexandria | VA 22314 US | </span><a href="https://www.protiviti.com/"><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:#004068">Protiviti.com</span></a><span style="font-size:8.0pt;font-family:"Verdana",sans-serif;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Netsec [mailto:netsec-bounces@cabforum.org]
<b>On Behalf Of </b>Peter Bowen via Netsec<br>
<b>Sent:</b> Thursday, July 6, 2017 12:37<br>
<b>To:</b> Neil Dunbar <ndunbar@trustcorsystems.com>; CA/Browser Forum Network Security WG List <netsec@cabforum.org><br>
<b>Subject:</b> Re: [cabf_netsec] [EXTERNAL]Re: Offline Roots<o:p></o:p></span></p>
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<p class="MsoNormal">On Jul 6, 2017, at 7:44 AM, Neil Dunbar via Netsec <<a href="mailto:netsec@cabforum.org">netsec@cabforum.org</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">On 6 Jul 2017, at 15:23, Bruce Morton <<a href="mailto:Bruce.Morton@entrustdatacard.com">Bruce.Morton@entrustdatacard.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Hi Neil,</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">My search was wrong. I should have stated 1d, 1g, 1h, 2m and 2o</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal">So, 2o is essentially inoperative. Perhaps a change like:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">FROM: o. Restrict remote administration or access to an Issuing System, Certificate Management System, or Security Support System except when:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">TO: o. Restrict remote administration or access *to network connected devices* to an Issuing System, Certificate Management System, or Security Support System except when:<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">(thus making it explicitly inoperative for non-networked systems).<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">We had an issue with 2m where we were expected to have multi-factor authentication for an off-line root.</span><o:p></o:p></p>
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<p class="MsoNormal">Is MFA for offline roots such a burden? I mean, password and USB connected fingerprint reader, or password and U2F device configured for HMAC-SHA1 challenge would work in an offline login. Doesn’t the actual HSM activation count as 2-factor
(PIN plus key auth device)?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Where I’m going with all of this, since we’re in ‘low hanging fruit’ grabbing, is to ensure that the changes are as tight as possible, to avoid controversy while updating the existing NetSec doc.<o:p></o:p></p>
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<p class="MsoNormal">What about changing 2(m) to “multi-factor or multi-party authentication”? This would allow offline systems to use HSM controls to meet the requirement. The definition of “system” is “one or more pieces of equipment”, so it is reasonable
to say that a HSM attached to a computer, even if the HSM is a separate chassis, creates a single “issuing system”.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Peter<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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