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</o:shapelayout></xml><![endif]--></head><body lang=FR-BE link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Hi B.R.,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Thank you very much for your answer and sorry for the US media political like message ;-)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>So, if I understand correctly, using </span><b><span lang=EN-US style='font-size:11.0pt;font-family:"Courier New";color:#1F497D;mso-fareast-language:EN-US'>ssl_session_timeout</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'> makes sure that after the specified amount of time, the TLS/SSL Sessions will be removed/purged from the TLS/SSL Shared Cache?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Is that correct?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Kind regards,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'>Arnaud<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D;mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span lang=EN-US style='font-size:11.0pt;font-family:"Calibri",sans-serif'> nginx [mailto:nginx-bounces@nginx.org] <b>On Behalf Of </b>B.R.<br><b>Sent:</b> lundi 11 avril 2016 13:23<br><b>To:</b> nginx ML <nginx@nginx.org><br><b>Subject:</b> Re: TLS/SSL Cache Automatic Purge<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='color:#333399'>Sounds like US media political messages: 'I am Arnaud, and I approve this message'. That said, welcome!<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='color:#333399'><br>You will have to write your own module if you want to manually delete TLS sessions parameters instead of letting them expire after 10 minutes.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='color:#333399'>You could also emulate this daily purge by keeping stock nginx but setting :<br></span><span style='font-family:"Courier New";color:#333399'>ssl_session_timeout 1d;</span><span style='color:#333399'><o:p></o:p></span></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'><span style='color:#333399'>albeit I for one do not recommend such settings since sessions parameters should probably not be remembered that long for several reasons...<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='color:#333399'>On a side-note, by default nginx does not store session parameters as it prefers <a href="http://nginx.org/en/docs/http/ngx_http_ssl_module.html#ssl_session_tickets" target="_blank">tickets</a>, supported since v1.5.9, over sessions ID.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='color:#333399'>The former is a more recent mechanism than the latter, and has the notable benefit of storing session parameters client-side, which scales, avoids cache management trouble as yours and some other ones. There are <a href="http://chimera.labs.oreilly.com/books/1230000000545/ch04.html#TLS_RESUME" target="_blank">some docs</a> about that in the Web tubes.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='color:#333399'>Why not sticking with those defaults (or even set </span><span style='font-family:"Courier New";color:#333399'>ssl_session_cache</span><span style='color:#333399'> to </span><span style='font-family:"Courier New";color:#333399'>off</span><span style='color:#333399'> to be absolutely clear)?<o:p></o:p></span></p></div><div><div><div><p class=MsoNormal><span style='font-size:7.5pt;color:#666666'>---<br><b>B. R.</b></span><o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>On Mon, Apr 11, 2016 at 10:41 AM, Arnaud Van der Vorst <<a href="mailto:sbxara@icloud.com" target="_blank">sbxara@icloud.com</a>> wrote:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Hi,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>My name is Arnaud and I am new to the list.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I would like to know if NGINX is using any automatic purge mechanism for its TLS/SSL Cache configured using the following directives:</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-family:"Courier New"'>ssl_session_timeout 10m;</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='font-family:"Courier New"'>ssl_session_cache shared:SSL:10m;</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>I understand that a daily purge of TLS/SSL Cache is highly recommended to avoid breaking Perfect Forward Secrecy of the TLS Protocol.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>If it does NOT use automatic purge, how can I purge the Shared cache used by NGINX then?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Are there any command line tools for that purpose?</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Thank you very much in advance for your answer and have a nice day!</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US>Kind regards,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='color:#888888'> </span><span style='color:#888888'><o:p></o:p></span></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=EN-US style='color:#888888'>Arnaud</span><span style='color:#888888'><o:p></o:p></span></p></div></div><p class=MsoNormal><br>_______________________________________________<br>nginx mailing list<br><a href="mailto:nginx@nginx.org" target="_blank">nginx@nginx.org</a><br><a href="http://mailman.nginx.org/mailman/listinfo/nginx" target="_blank">http://mailman.nginx.org/mailman/listinfo/nginx</a><o:p></o:p></p></blockquote></div><p class=MsoNormal><o:p> </o:p></p></div></div></div></body></html>