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  1. Oct 21, 2013
    • Nick Mathewson's avatar
      2927791d
    • Nick Mathewson's avatar
      Do not include a timestamp in the Client/ServerHello Random field. · 2016265d
      Nick Mathewson authored
      Instead, send random bytes, unless SSL_SEND_{CLIENT,SERVER}RANDOM_MODE
      is set.
      
      This is a forward-port of commits:
        4af793036f6ef4f0a1078e5d7155426a98d50e37
        f4c93b46edb51da71f09eda99e83eaf193a33c08
        3da721dac9382c48812c8eba455528fd59af2eef
        2583270191a8b27eed303c03ece1da97b9b69fd3
      
      While the gmt_unix_time record was added in an ostensible attempt to
      mitigate the dangers of a bad RNG, its presence leaks the host's view
      of the current time in the clear.  This minor leak can help
      fingerprint TLS instances across networks and protocols... and what's
      worse, it's doubtful thet the gmt_unix_time record does any good at
      all for its intended purpose, since:
      
          * It's quite possible to open two TLS connections in one second.
      
          * If the PRNG output is prone to repeat itself, ephemeral
            handshakes (and who knows what else besides) are broken.
      2016265d
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