wireshark-users October 2010 archive
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wireshark-users: Re: [Wireshark-users] Problem deciphering an op

Re: [Wireshark-users] Problem deciphering an openssl stream

From: Marco Simone Zuppone <msz_at_nospam>
Date: Thu Oct 07 2010 - 11:28:31 GMT
To: Community support list for Wireshark <wireshark-users@wireshark.org>

Hello,

sorry I have one question: whay you are using ip 0.0.0.0 and port 0??
You should use the IP of the web server and the port used by the HTTP(S)
stream: normally 443.
 Regards,
Marco S. Zuppone

On Thu, Oct 7, 2010 at 12:15 PM, Philippe Fremy <phil@freehackers.org>wrote:

>
> (re-sending, it seems that my first mail did not get through)
>
> Hi,
>
> I tried everything I could think of, but I still can't decipher the SSL
> stream from my server.
>
> Any help would be really appreciated.
>
> I am running WireShark Version 1.0.1 (SVN Rev 25639) on Windows XP.
>
> I've got the private key of the certificate exported in the PEM format,
> not ciphered. It begins with:
>
> -----BEGIN RSA PRIVATE KEY-----
> MIICXwIBAAKBgQC6igE7s9qXN+PXa0mFQKTIrr7lZM/j+QQwd1FBK7Awy2+dTrlY
>
> I've set Wireshark SSL to use it:
> 0.0.0.0,0,http,w:\open-privatekey.pem
>
> and a debug log file:
> d:\philippe\wireshark-ssl.log
>
> I've captured the traffic remotely with:
> sudo tcpdump -i eth1 -s 65535 -w mysite-tcpdump.pcap
>
> When I load it in wireshark, it's not decoded. Looking at the debug log
> output, I have:
>
> ssl_init keys string:
> 0.0.0.0,0,http,w:\open-privatekey.pem
> ssl_init found host entry 0.0.0.0,0,http,w:\open-privatekey.pem
> ssl_init addr '0.0.0.0' port '0' filename 'w:\open-privatekey.pem'
> password(only for p12 file) '(null)'
> ssl_init private key file w:\open-privatekey.pem successfully loaded
> association_add TCP port 0 protocol http handle 02C154C8
> association_find: TCP port 993 found 03B164C0
> ssl_association_remove removing TCP 993 - imap handle 02B39B88
> association_add TCP port 993 protocol imap handle 02B39B88
> association_find: TCP port 995 found 03B16500
> ssl_association_remove removing TCP 995 - pop handle 037FBA10
> association_add TCP port 995 protocol pop handle 037FBA10
>
> For the first packets concerning my server, I get:
>
> dissect_ssl enter frame #166 (first time)
> ssl_session_init: initializing ptr 04804DA8 size 564
> association_find: TCP port 46705 found 00000000
> packet_from_server: is from server - FALSE
> dissect_ssl server 212.117.xx.yy:443
> dissect_ssl can't find private key for this server! Try it again with
> universal port 0
> dissect_ssl can't find private key for this server (universal port)! Try
> it again with universal address 0.0.0.0
> dissect_ssl can't find any private key!
> conversation = 04804BD0, ssl_session = 04804DA8
> client random len: 16 padded to 32
>
> I don't get why Wireshark can not find the key in this case.
>
> dissect_ssl enter frame #167 (first time)
> conversation = 04804BD0, ssl_session = 04804DA8
> dissect_ssl3_record found version 0x0301 -> state 0x11
> dissect_ssl3_record: content_type 22
> decrypt_ssl3_record: app_data len 927 ssl, state 0x11
> association_find: TCP port 443 found 03ADCDD8
> packet_from_server: is from server - TRUE
> decrypt_ssl3_record: using server decoder
> decrypt_ssl3_record: no decoder available
> dissect_ssl3_handshake iteration 1 type 2 offset 5 length 77 bytes,
> remaining 932
> dissect_ssl3_hnd_hello_common found SERVER RANDOM -> state 0x13
> dissect_ssl3_hnd_srv_hello found CIPHER 0x002F -> state 0x17
> dissect_ssl3_hnd_srv_hello not enough data to generate key (required 0x37)
> dissect_ssl3_handshake iteration 0 type 11 offset 86 length 838 bytes,
> remaining 932
> dissect_ssl3_handshake iteration 0 type 14 offset 928 length 0 bytes,
> remaining 932
>
> And I don't get why there is not enough data to generate the key.
>
> Any help really welcome.
>
> cheers,
>
> Philippe
>
>
>
>
>
>
>
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