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<p class="MsoNormal"><span lang="EN-US">Hi,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">We have certain requirements that force us to ensure that we can force specific TLS protocol versions.<br>
First I tried doing this using an openssl configuration file. However, I noticed that within src/lib/omniORB/orbcore/ssl/sslContext.cc the TLS version configuration is overwritten.<br>
```<br>
void<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">sslContext::set_supported_versions() {<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> SSL_CTX_set_options(pd_ctx,<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 |<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"> SSL_OP_NO_TLSv1 | SSL_OP_NO_TLSv1_1);<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">}<br>
```<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Do you have any suggestions on how to force specific protocol versions?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><br>
Alternatively, I would like to propose that we add additional configuration to omniorb that behaves similar to `cipher_list`.<br>
Essentially, I would like to be able to set the protocol version using the orb specific configurations as well as using the python interface.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">According to the openssl wiki setting the version using options is deprecated. Hence, I suggest we adopt the min and max approach of configuration.<o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoListParagraph" style="margin-left:-12.75pt;mso-list:l0 level1 lfo3">
<a href="https://wiki.openssl.org/index.php/List_of_SSL_OP_Flags"><span lang="EN-US">https://wiki.openssl.org/index.php/List_of_SSL_OP_Flags</span></a><span lang="EN-US"><br>
</span><span lang="EN-US" style="font-size:9.5pt;font-family:"Arial",sans-serif;color:black;background:white">These options are deprecated as of 1.1.0, use <b>SSL_CTX_set_min_proto_version()</b> and <b>SSL_CTX_set_max_proto_version()</b> instead.</span><span lang="EN-US"><o:p></o:p></span></li></ul>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Sadly, my understanding of the omniorb codebase is rather limited at the moment, hence writing appropriate tests and getting all locations correct is currently out of reach for me.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US">Nevertheless, I prepared a small patch as a sketch for my proposal. (I never compiled it and it does not yet cover Python. Just to show my idea!)<br>
<br>
Do you think that my approach is worth implementing?<br>
<br>
Best regards,<br>
Yves-Noel Weweler<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-US"><o:p> </o:p></span></p>
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