XSF logo XMPP Service Operators - 2017-09-27


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  73. random Holger: hi, on check.messaging.one there's a thing not covered in faqs that I don't understand: in cipher section what means ""
  74. random Server does not rspect client cipher ordering?
  75. Ge0rG random: it means that the server will choose the best cipher from the client's list, instead of the first one.
  76. Holger Both the server and the client advertise a list of supported ciphers. The client might advertise A|B|C and the server C|B|A. The question is whether A or C is chosen.
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  78. random I see, can it be solved so the server is the one that decides?
  79. random Any way to force it
  80. Ge0rG random: that's exactly what the message says.
  81. Zash Ackshhhhually, Client advertises, server picks one that is mutually supported. :) </pedantic>
  82. Holger Yes, the recommendation seems to be C, i.e. "don't respect the client's ordering". The assumption seems to be that the server knows more about ciphers than the client.
  83. Holger Zash: Right.
  84. Zash Server may take the clients ordering into consideration, or not.
  85. random Oooh i understand. So that's not a bad message
  86. Holger No.
  87. Zash It's just a message.
  88. Holger But yes it's worded in a somewhat negative way :-)
  89. Zash If the client has a terrible ordering then ignoring it is good. If the client has put thought into its ordering then ignoring it is .. less good.
  90. random I understand now, thanks everybody
  91. Zash xnyphs did some research into a the ordering of a bunch of clients and they weren't very nice, so having the server prefer its own order seemed like a sensible choice at the time
  92. Zash That situation may or may not have changed, and probably varies with clients.
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  94. Zash I kinda wish TLS APIs had more flexibility than either-or ordering. I think some Google / Chrome people (agl?) looked into that, but I don't think any changes have made it into eg OpenSSL
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