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<p class="MsoNormal"><span lang="DE">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="DE"><o:p> </o:p></span></p>
<p class="MsoNormal">I am facing some uncertainties regarding how to properly set up SSL_CTX & SSL structs, so that certificate based, (mutual) authentication works (TLS 1.3).<o:p></o:p></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">Certificates are loaded via an external lib and I get them as binary ASN.1. After parsing them into proper openssl X509 structs, I load them into a X509_Store with
<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue">X509_STORE_add_cert</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">I use the
<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue">SSL_CTX_set1_cert_store</span> method to load the thus constructed store into an SSL_CTX
<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">I also use
<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue">SSL_add_client_CA
</span>to add all CA/Roots names to the Server list of available Cas (to be sent to the Client when initiating mutual auth)<o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">I have set the Verify flag to Verify_Peer via
<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue">SSL_set_verify</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">An instance’s chain cert are added via
<span style="font-size:9.5pt;font-family:Consolas;color:#6F008A">SSL_add1_chain_cert
</span><o:p></o:p></li><li class="MsoListParagraph" style="margin-left:0cm;mso-list:l0 level1 lfo1">An instance’s key and leaf cert are added via
<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue">SSL_use_certificate
</span>and<span style="font-size:9.5pt;font-family:Consolas;color:darkslateblue"> SSL_use_PrivateKey
</span>respectively<o:p></o:p></li></ul>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Q1: Is here anything I forget with regards to the general set-up of the verification process?<o:p></o:p></p>
<p class="MsoNormal">Q2: Assume the Verification Certificates are loaded into SSL_CTX after an SSL struct was already created from it. Will the SSL struct “know” of the Certificate Store and access it properly? Or would I have to create a new SSL struct from
SSL_CTX in order for this configuration to take effect?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks everyone<o:p></o:p></p>
<p class="MsoNormal">Jochen<o:p></o:p></p>
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