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We are categorizing the network traffic , like determining if it is facebook,yahoo etc... Now I have been asked also seperate mobile devices(like ipad, nexus, iphone). It is easy to that in HTTP with user agent information.

But I also need to consider HTTPS protocol , is there any way I get any information about user device in "client hello" or "certificate" messages?

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Provided they're not using something like VPN or a Proxy you should be able to check a few things with an app like WireShark:

  1. DNS requests for different websites (before the TLS or HTTPS devices will typically look-up the server). Eg. Facebook is using Akamai so if you can capture a DNS packet bound for fb.*\.akamai\.net that will give you both IPs (and the client MAC address). Then you can track the traffic from that IP through the session.
  2. IP Reverse Look-up (You can check an outside service's IP registrant at a directory like ARIN) - whois -h whois.arin.net
  3. You can look-up the device manufacturer via MAC Address
  4. Like Manishearth was saying, you can try to catch a user agent from web browsing on the same IP during that same session, then marry the user_agent to the MAC Address.
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Not directly. The Certificate message is sent by the server. The ClientHello may help categorizing things, as different browsers/devices support different algorithms.

Instead, it may help to use the HTTP user agent to associate a device to an IP address and then use that tag for HTTPS connections.

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I expect most browsers to have different ClientHellos. At least Opera, Firefox and Internet Explorer are totally different. –  CodesInChaos Jun 14 '13 at 8:12
@CodesInChaos: Hmm, you're right. Edited out. –  Manishearth Jun 14 '13 at 8:57
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