I'm newbie to encryption & beginner to Apache.
Length: 81
Handshake Protocol: Server Hello
Handshake Type: Server Hello (2)
Length: 77
Version: TLS 1.0 (0x0301)
Random
gmt_unix_time: May 23, 2011 11:01:51.0000000000
random_bytes: C0C48BA2.....
Session ID Length: 32
Session ID: 53283989...
Cipher Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0X0039) <==
Above is an extract of a data traffic sniffed using a product which
I'm evaluating.
I have a requirement to use a sniffing product (which I connect to our
internal LAN) to capture users access to our website portal to check
which pages the user access & the time a user login / logout & SSL
https encryption is involved. However, to do this, I'll need to do
decryption.
My Apache web servers appear to be configured to use "Diffie-Hellman" key
exchange. This can be verified by looking at the Server Hello packets and
viewing the Cipher Suite (as shown in above traffic capture). "DHE" means
Diffie-Hellman key exchange.
I suppose this means the shared private key from the web server is not used.
In Diffie-Hellman key exchange, the private key for each session is created
dynamically between the client and server, and is therefore technically
impossible to decrypt : correct me if I'm wrong. Refer to links / urls below
on why DH key exchange makes SSL decryption impossible:
- http://www.unleashnetworks.com/blog/?p=28
- http://wirewatcher.wordpress.com/2010/07/20/decrypting-ssl-traffic-with-wireshark-and-ways-to-prevent-it/
In my Apache config file, there's a line below:
SSLCipherSuite HIGH:MEDIUM:!aNULL:+SHA1:+MD5:+HIGH:+MEDIUM
Question:
Which alternative cipher provides the same encryption/key strength -
just doesn't use Diffie-Hellman for key exchange?
How should I amend my Apache config file so that it replaces Diffie-Hellman
with this new encryption? Pls provide as precise the instruction as possible
& whether I need to do "service httpd restart" or "service httpd reload"?
Any alternative proposed should not flag out as vulnerability during a
vulnerability scan.
Then I would be able to use the promiscuous mode sniffing device to see a
user logins & the slow pages that he accessed etc
Thanks
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