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<p class="MsoNormal">I don’t recall the details of 1.0.2, sorry. Maybe someone else on this list knows the best place to insert your checks.<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">Sandeep Deshpande <sandeep.bvb@gmail.com><br>
<b>Date: </b>Thursday, May 31, 2018 at 6:08 PM<br>
<b>To: </b>Rich Salz <rsalz@akamai.com>, openssl-users <openssl-users@openssl.org><br>
<b>Subject: </b>Re: [openssl-users] Fwd: basic constraints check<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">Hi Rich.. Thanks.. <o:p></o:p></p>
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<p class="MsoNormal">We want to add a check in our openssl library on client side to reject such server certificate which are generated by the intermediate CA with missing extensions like basic constraints..<o:p></o:p></p>
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<p class="MsoNormal">How do we go about it?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I looked at the code. In crypto/x509v3/v3_purp.c I see that check_ca is there. But it is getting called only for server certificate. <o:p></o:p></p>
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<p class="MsoNormal"><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">Sandeep <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 Thu, May 31, 2018, 11:39 PM Salz, Rich via openssl-users <<a href="mailto:openssl-users@openssl.org">openssl-users@openssl.org</a>> wrote:<o:p></o:p></p>
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<li class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l0 level1 lfo1">
We generated intermediate02 such that it has "basicConstraints" extension and "keyUsage" missing. Now we used this intermediate 02 CA to sign server certificate. <o:p></o:p></li></ul>
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<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">If those extensions, which are *<b>optional,</b>* are not present, then there is no limit on how the keys may be used, or how long the cert chain may be. OpenSSL is doing the right
thing.<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">If you want to add them, and you cannot upgrade, then read about the openssl config file syntax. Good luck.<o:p></o:p></p>
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