Denis,

As I understand stunnel is logging the fact that the client closed the connection (socket) while it was waiting for data (reading) from the client. 

Looks like your client connects for a very short time, sends just 1 byte, the disconnects.

Mike can correct me if I am wrong.

Regards,
Jose


From: Denis Berezhnoy <denis.berezhnoy@gmail.com>
To: Jose Alf. <josealf@rocketmail.com>
Cc: "stunnel-users@stunnel.org" <stunnel-users@stunnel.org>
Sent: Tuesday, January 31, 2012 1:11 PM
Subject: Re: [stunnel-users] No SSL handshake between stunnel in client mode and SSL server

Hi Jose,

Thank you for your help!  Finally I made it working.

But there is one thing that is not quite clear for me.  In logs I can see "Socket closed on read". Here it is:

2012.01.31 12:57:12 LOG7[6748:6808]: Socket closed on read
2012.01.31 12:57:12 LOG7[6748:6808]: Sending close_notify alert"

Can you please explain what it means? Why socket is closed?

Here is log:

2012.01.31 12:56:58 LOG7[6748:4740]: No limit detected for the number of clients
2012.01.31 12:56:58 LOG5[6748:4740]: stunnel 4.52 on x86-pc-mingw32-gnu platform
2012.01.31 12:56:58 LOG5[6748:4740]: Compiled/running with OpenSSL 0.9.8s-fips 4 Jan 2012
2012.01.31 12:56:58 LOG5[6748:4740]: Threading:WIN32 SSL:ENGINE,FIPS Auth:none Sockets:SELECT,IPv6
2012.01.31 12:56:58 LOG5[6748:4740]: Reading configuration from file stunnel.conf
2012.01.31 12:56:58 LOG5[6748:4740]: FIPS mode is disabled
2012.01.31 12:56:58 LOG7[6748:4740]: Compression not enabled
2012.01.31 12:56:58 LOG7[6748:4740]: Snagged 64 random bytes from C:/.rnd
2012.01.31 12:56:58 LOG7[6748:4740]: Wrote 1024 new random bytes to C:/.rnd
2012.01.31 12:56:58 LOG7[6748:4740]: PRNG seeded successfully
2012.01.31 12:56:58 LOG6[6748:4740]: Initializing SSL context for service Router
2012.01.31 12:56:58 LOG7[6748:4740]: SSL options set: 0x05000004
2012.01.31 12:56:58 LOG6[6748:4740]: SSL context initialized
2012.01.31 12:56:58 LOG5[6748:4740]: Configuration successful
2012.01.31 12:56:58 LOG7[6748:4740]: Service Router bound FD=292 to 192.168.1.121:55555
2012.01.31 12:57:12 LOG7[6748:4740]: Service Router accepted FD=332 from 192.168.1.161:59076
2012.01.31 12:57:12 LOG7[6748:4740]: Creating a new thread
2012.01.31 12:57:12 LOG7[6748:4740]: New thread created
2012.01.31 12:57:12 LOG7[6748:6808]: Service Router started
2012.01.31 12:57:12 LOG5[6748:6808]: Service Router accepted connection from 192.168.1.161:59076
2012.01.31 12:57:12 LOG6[6748:6808]: connect_blocking: connecting 192.168.160.169:55443
2012.01.31 12:57:12 LOG7[6748:6808]: connect_blocking: s_poll_wait 192.168.160.169:55443: waiting 10 seconds
2012.01.31 12:57:12 LOG5[6748:6808]: connect_blocking: connected 192.168.160.169:55443
2012.01.31 12:57:12 LOG5[6748:6808]: Service Router connected remote server from 192.168.1.121:52050
2012.01.31 12:57:12 LOG7[6748:6808]: Remote FD=412 initialized
2012.01.31 12:57:12 LOG7[6748:6808]: Peer certificate was cached (1017 bytes)
2012.01.31 12:57:12 LOG6[6748:6808]: SSL connected: new session negotiated
2012.01.31 12:57:12 LOG6[6748:6808]: Negotiated ciphers: RC4-SHA SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=SHA1
2012.01.31 12:57:12 LOG6[6748:6808]: Compression: null, expansion: null
2012.01.31 12:57:12 LOG7[6748:6808]: Socket closed on read
2012.01.31 12:57:12 LOG7[6748:6808]: Sending close_notify alert
2012.01.31 12:57:12 LOG6[6748:6808]: SSL_shutdown successfully sent close_notify alert
2012.01.31 12:57:22 LOG3[6748:6808]: transfer: s_poll_wait: TIMEOUTclose exceeded: closing
2012.01.31 12:57:22 LOG5[6748:6808]: Connection closed: 200 bytes sent to SSL, 1 bytes sent to socket
2012.01.31 12:57:22 LOG7[6748:6808]: Service Router finished (0 left)

Best regards,
Denis

2012/1/25 Jose Alf. <josealf@rocketmail.com>
Denis,

Please review this:

http://stunnel.mirt.net/pipermail/stunnel-users/2011-May/003080.html

In particular, check that you have your signing CA certificates (hashed) in your CaPath.

Do the tests with openssl connect and post sanitized results if you are in trouble.

Regards,
Jose


From: Denis Berezhnoy <denis.berezhnoy@gmail.com>
To: Jose Alf. <josealf@rocketmail.com>
Cc: "stunnel-users@stunnel.org" <stunnel-users@stunnel.org>
Sent: Wednesday, January 25, 2012 9:55 AM
Subject: Re: [stunnel-users] No SSL handshake between stunnel in client mode and SSL server

Hi Jose,
 
Thank you for your reply. I double checked and actually there is SSL handshake. Sorry, it was my mistake I did not analyze WireShark capture carefully.
 
But handshake failed and here is stunnel log:
 
2012.01.25 09:39:58 LOG5[1944:6264]: stunnel 4.52 on x86-pc-mingw32-gnu platform
2012.01.25 09:39:58 LOG5[1944:6264]: Compiled/running with OpenSSL 0.9.8s-fips 4 Jan 2012
2012.01.25 09:39:58 LOG5[1944:6264]: Threading:WIN32 SSL:ENGINE,FIPS Auth:none Sockets:SELECT,IPv6
2012.01.25 09:39:58 LOG5[1944:6264]: Reading configuration from file stunnel.conf
2012.01.25 09:39:58 LOG5[1944:6264]: FIPS mode is enabled
2012.01.25 09:39:58 LOG5[1944:6264]: Configuration successful
2012.01.25 09:40:13 LOG5[1944:4724]: Service Router accepted connection from 192.168.1.161:59519
2012.01.25 09:40:13 LOG5[1944:4724]: connect_blocking: connected 192.168.160.168:55443
2012.01.25 09:40:13 LOG5[1944:4724]: Service Router connected remote server from 192.168.1.121:52250
2012.01.25 09:40:13 LOG3[1944:4724]: SSL_connect: 1408F10B: error:1408F10B:SSL routines:SSL3_GET_RECORD:wrong version number
2012.01.25 09:40:13 LOG5[1944:4724]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket
Server is setup for SSL3.0.
 
Best regards,
Denis

2012/1/24 Jose Alf. <josealf@rocketmail.com>
Denis,

Looks like your configuration is incomplete. Check  the sample stunnel.conf file in the stunnel distribution. Read the man page. Post your log file.

Try adding lines like these before [Router]

sslVersion = SSLv3

cert=stunnel.pem
key=stunnel.pem

# Authentication stuff, try 0 for test
verify = 0

CApath = /your/CAcerts/path

debug = 7
output = stunnel.log




From: Denis Berezhnoy <denis.berezhnoy@gmail.com>
To: stunnel-users@stunnel.org
Sent: Tuesday, January 24, 2012 6:10 PM
Subject: [stunnel-users] No SSL handshake between stunnel in client mode and SSL server

Hi guys,
I have a quick question. I am trying to use stunnel in client mode to encrypt traffic going to my server.
Basically, I have a server which listens for SSL connection. And I have a client which can not do SSL but it needs to communicate with server over SSL.
I setup stunnel in client mode to accept unecrypted traffic from client and redirect it to server over SSL. I checked TCP traffic with WireShark between stunnel  and my server and I can see that there is no SSL handshake, stunnel makes TCP connection with server and sends some TCP packets but I expect to see SSL handshake.
My stunnel conf file is here:
[Router]
client=yes
accept = 192.168.1.121:55555
connect = 192.168.160.168:55443
Can you please comment on this?
Best regards,
Denis

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