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<p class="MsoNormal">Dear Michal, Dear All,<o:p></o:p></p>
<p class="MsoNormal">Please find attached a patch to stunnel 4.56 to clear SSL_OP_LEGACY_SERVER_CONNECT.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">There was a security requirement to ensure that the stunnel client could not connect to unpatched servers.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I am aware from OpenSSL (<a href="https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html">https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html</a> ) that this parameter is currently set by default and has to be manually cleared
by calling <code><span style="font-size:10.0pt">SSL_CTX_clear_options()</span></code> or
<code><span style="font-size:10.0pt">SSL_clear_options()</span></code>if an OpenSSL client applications wants to ensure they can
<strong><span style="font-family:"Calibri","sans-serif"">not</span></strong> connect to unpatched servers (and thus avoid any security issues).<code><span style="font-size:10.0pt"><o:p></o:p></span></code></p>
<p class="MsoNormal"><code><span style="font-size:10.0pt"><o:p> </o:p></span></code></p>
<p class="MsoNormal">The attached patch achieves this.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">OpenSSL also state “As more servers become patched the option
<strong><span style="font-family:"Calibri","sans-serif"">SSL_OP_LEGACY_SERVER_CONNECT</span></strong> will
<strong><span style="font-family:"Calibri","sans-serif"">not</span></strong> be set by default in a future version of OpenSSL” so this patch is only required until OpenSSL change the default value.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks..<o:p></o:p></p>
<p class="MsoNormal">John<o:p></o:p></p>
<p class="MsoNormal"><code><span style="font-size:10.0pt"><o:p> </o:p></span></code></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#2A3136"><img border="0" width="172" height="22" id="Picture_x0020_1" src="cid:image001.gif@01CF9081.B548ECF0" alt="Unify: Harmonize your enterprise"></span><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif"">John Simner BSc(Hons) MSc CEng. MIET</span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">Software Engineer, Devices Development<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="FR" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Unify Enterprise Communications Ltd.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Tel.: +44 (1908) 817378 (One Number Service)<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Email:
<a href="mailto:vorname.name@unify.com"><span style="color:blue">john.simner@unify.com
</span></a><u><span style="color:blue"><o:p></o:p></span></u></span></p>
<p class="MsoNormal"><u><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p><span style="text-decoration:none"> </span></o:p></span></u></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif""><a href="http://www.unify.co.uk/"><span style="color:blue">www.unify.co.uk</span></a></span><span style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif""><o:p> </o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif"">Follow us: </span><a href="http://www.unify.com/social-media"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:windowtext;text-decoration:none"><img border="0" width="132" height="14" id="Bild_x0020_1" src="cid:image002.png@01CF9081.B548ECF0" alt="Social_media_icons"></span></a><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-autospace:none"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:blue"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Unify Enterprise Communications Limited. Registered Office: Brickhill Street, Willen Lake, Milton Keynes, MK15 0DJ<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black">Registered No: 5903714, England.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"> <o:p></o:p></span></p>
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