On Thu, Jul 28, 2011 at 09:14:34AM -0700, navin gopalakrishnan wrote:
> 1) When i use my own applications (client & server) which uses
> the openssl library a separate client program and a separate server
> program, both configured to use only eNULL as above. (i.e. with only
> NULL_SHA & NULL_MD5),
The ciphers are "NULL-SHA" and "NULL-MD5", not "NULL_SHA" or "NULL_MD5".
$ openssl ciphers -v NULL-SHA:NULL-MD5
NULL-SHA SSLv3 Kx=RSA Au=RSA Enc=None Mac=SHA1
NULL-MD5 SSLv3 Kx=RSA Au=RSA Enc=None Mac=MD5
> I am seeing a error at the server application saying:
>
> ???? Error in GET_CLIENT_HELLO_MSG: No shared ciphers: in s_srvr.c .....
Then perhaps you have not installed a suitable server certificate, or
more likely you have not in fact correctly configured the client or
server cipherlist.
> Unable to understand what the error message is saying .. i was expecting that
> since both my client & server have the common ciphers - NULL_SHA & NULL_MD5,
> one of them to get selected and the handshake should get completed....
Either the server has no certificate, or you've misconfigured the
ciphers:
> 2) Getting back to the client & server programs supplied along with the
> openssl package. When eNULL was configured as mentioned above, ran the
> wireshark
> packet capture utility.
> typed " hello world" at the server and the "hello world" was reflected in the
> client.
>
>
> Was expecting "hello world" to be seen in clear text because NULL encryption
> is used.
>
> But in wireshark i could not see anything in clear text .. Atleast i could
> not see "hello world" in the application data section of wireshark.
> Rightly application data was after the client hello exchange messages sent by
> the ssl protocol.
>
> wondering why clear text message was not seen .... does any form of encoding
> is used by the client & server.??
Compression may have been enabled. Or your test is flawed.
--
Viktor.
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