stunnel-users

2 participants
3307 discussions

SMTP & TLS
by Eric B. 27 Oct '06

27 Oct '06

Hi, I've been looking over using stunnel to secure SMTP connections, but am a little confused about how the protocol works. From what I've read, the STARTTLS command is used to allow a client/server to upgrade a connection from plaintext to SSL secured. Further to that, from what I understand, the concept is to allow/use a single port to initiate all connections - ex: port 25. >From what I can tell from stunnel however, is that once stunnel issues the STARTTLS command, if the client doesn't respond in kind, then the connection is terminated. I've tried reading the RFC, but can't seem to find what happens in the case where the client rejects or does not respond to the STARTTLS command. Logicially, I would expect the SMTP connection to continue normally in plaintext. Apparently, this is not how stunnel works. Can someone please help fill in the blanks for me please? What is supposed to happen if the client refuses the STARTTLS request from the server? If the connection is supposed to die, why bother with the STARTTLS request at all, and not just impose the SSL encrypted tunnel from the very beginning (as per the old SSMTP specs)? Thanks, Eric

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Fork Error
by John O'Fallon 27 Oct '06

27 Oct '06

Since upgrading to Stunnel 4.17, I occasionally get the following error: 2006.10.18 23:08:45 LOG3[7007:25232896]: fork: Resource temporarily unavailable (35) 2006.10.18 23:08:45 LOG5[7007:25232896]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket The problem doesn't occur right away, but after some number of hits on the server. Reverting to Stunnel 4.15 corrects the problem. This is an OS X 10.4 Mac. I haven't confirmed the problem with 4.18, because the release notes indicate mainly changes relevant to Win32. Has any one else seen the problem? Michal, any thoughts? TIA, John

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Stunnel hangs on big flows of data
by Dario Mariani 27 Oct '06

27 Oct '06

Hi... I'm deploying stunnel on some servers. I did some tests, and i never had problems. For example, i tried 5k parallel connections, and i didn't have any problem. But, i have problems when a small number of connections wants to transfer big chunks of information; the connection hangs. This is a snippet of logs: Server side: 2006.10.20 16:00:58 LOG7[20302:1]: oracle11521 accepted FD=226 from 192.168.22.10:39721 2006.10.20 16:00:58 LOG7[20302:200]: oracle11521 started 2006.10.20 16:00:58 LOG7[20302:200]: FD 226 in non-blocking mode 2006.10.20 16:00:58 LOG7[20302:200]: TCP_NODELAY option set on local socket 2006.10.20 16:00:58 LOG5[20302:200]: oracle11521 connected from 192.168.22.10:39721 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): before/ accept initialization 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 read client hello A 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 write server hello A 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 write change cipher spec A 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 write finished A 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 flush data 2006.10.20 16:00:58 LOG7[20302:200]: SSL state (accept): SSLv3 read finished A 2006.10.20 16:00:58 LOG7[20302:200]: 3 items in the session cache 2006.10.20 16:00:58 LOG7[20302:200]: 0 client connects (SSL_connect ()) 2006.10.20 16:00:58 LOG7[20302:200]: 0 client connects that finished 2006.10.20 16:00:58 LOG7[20302:200]: 0 client renegotiations requested 2006.10.20 16:00:58 LOG7[20302:200]: 199 server connects (SSL_accept()) 2006.10.20 16:00:58 LOG7[20302:200]: 194 server connects that finished 2006.10.20 16:00:58 LOG7[20302:200]: 0 server renegotiations requested 2006.10.20 16:00:58 LOG7[20302:200]: 173 session cache hits 2006.10.20 16:00:58 LOG7[20302:200]: 0 session cache misses 2006.10.20 16:00:58 LOG7[20302:200]: 18 session cache timeouts 2006.10.20 16:00:58 LOG6[20302:200]: SSL accepted: previous session reused 2006.10.20 16:00:58 LOG7[20302:200]: FD 227 in non-blocking mode 2006.10.20 16:00:58 LOG7[20302:200]: oracle11521 connecting 192.168.22.13:1521 2006.10.20 16:00:58 LOG7[20302:200]: connect_wait: waiting 10 seconds 2006.10.20 16:00:58 LOG7[20302:200]: connect_wait: connected 2006.10.20 16:00:58 LOG7[20302:200]: Remote FD=227 initialized 2006.10.20 16:00:58 LOG7[20302:200]: TCP_NODELAY option set on remote socket 2006.10.20 16:00:58 LOG7[20302:75]: SSL_read returned WANT_READ: retrying 2006.10.20 16:00:58 LOG7[20302:75]: SSL_read returned WANT_READ: retrying 2006.10.20 16:00:58 LOG7[20302:75]: SSL_read returned WANT_READ: retrying client side: 2006.10.20 16:16:01 LOG6[12415:91]: SSL connected: new session negotiated 2006.10.20 16:16:01 LOG6[12415:91]: Negotiated ciphers: DES-CBC3- SHA SSLv3 Kx=RSA Au=RSA Enc=3DES(168) Mac=SHA1 2006.10.20 16:16:01 LOG7[12415:91]: Socket closed on read 2006.10.20 16:16:01 LOG7[12415:91]: SSL write shutdown 2006.10.20 16:16:01 LOG7[12415:91]: SSL alert (write): warning: close notify 2006.10.20 16:16:01 LOG7[12415:91]: SSL_shutdown retrying 2006.10.20 16:16:01 LOG7[12415:91]: SSL doesn't need to read or write 2006.10.20 16:16:01 LOG7[12415:91]: SSL alert (read): warning: close notify 2006.10.20 16:16:01 LOG7[12415:91]: SSL closed on SSL_read 2006.10.20 16:16:01 LOG7[12415:91]: Socket write shutdown 2006.10.20 16:16:01 LOG5[12415:91]: Connection closed: 3663 bytes sent to SSL, 5239 bytes sent to socket 2006.10.20 16:16:01 LOG7[12415:91]: oracle11521 finished (3 left) The timings are shifted, i don't know if the delta of time is related to a misconfiguration of clock on the machines, or are snippets taken from different events... i don't have direct access to the machines. I tried to make a test (client and server on the same machine) client: nc localhost 10001 >>/dev/null stunnel accept on 10001 and connect to localhost:11521 on the server side: stunnel accept on 11521 and connect on 1521 cat 230megsfile | nc -l -p 1521 & 2>&1 >>/dev/null so, when the nc on client side connects, the server starts the cat. It did complete correctly within a pair of minutes on an ibook 64 1.33 1g ram, but with LOADS of want_read and want_write errors on both sides of stunnel. The server and client are working on "big iron", i mean some superdome hardware with 30-40 cpu on both sides, and with an estimated traffic of 10gig/day And, important... the version of the stunnel instances is 4.15 Can you help me? Bye, dario.

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Fwd: [stunnel-users] Stunnel client not sending data
by Jeremiah Martell 26 Oct '06

26 Oct '06

I forgot to send this to the entire group. My server program was listening on the wrong port. :-) Thanks, - Jeremiah ---------- Forwarded message ---------- From: Jeremiah Martell <inlovewithgod(a)gmail.com> Date: Oct 25, 2006 8:59 AM Subject: Re: [stunnel-users] Stunnel client not sending data To: Carter Browne <cbrowne(a)cbcs-usa.com> HA! Such a simple thing, but yes, that was the problem. I had the wrong port. :-) Thanks, - Jeremiah On 10/25/06, Carter Browne <cbrowne(a)cbcs-usa.com> wrote: > Jeremiah, > > I set the debug level on a stunnel configuration to 7 to understand better where you are failing. You have established > good connection to stunnel, but stunnel cannot get to 127.0.0.1:10000. So is your application listening on > 127.0.0.1:10000? Have you tried running netstat -an to establish that there is a process listening to the port? > > Carter > > Jeremiah Martell wrote: > > Carter, > > > > You're right. That was a typo error on my part. My config says 1.2.3.70. > > > > Anything other ideas? > > > > Thanks, > > - Jeremiah > > > > On 10/25/06, Carter Browne <cbrowne(a)cbcs-usa.com> wrote: > >> On the server side, I think you should be receiving on 1.2.3.70 (since > >> that is where you are sending the data). > >> > >> Carter > >> > >> Jeremiah Martell wrote: > >> > Hello, > >> > > >> > I have a program that opens up a connection to port 10000 of a server > >> > and sends it some data. It works normally. I'm trying to "stunnel" > >> > both ends. > >> > > >> > In my program I create a socket, connect to local port 7033, send my > >> > data, and close the socket. I verified that every function call > >> > returns success (socket, setsockopt (for TCP_NODELAY), gethostbyname, > >> > connect, and send). > >> > > >> >> From what the logs show below, it seems that server stunnel gets the > >> > connection from the client stunnel, they successfully negotiate the > >> > SSL stuff, then the client stunnel waits for any data to proxy to the > >> > server stunnel. The server stunnel is waiting too, and after 10 > >> > seconds of no data, it closes the socket. > >> > > >> > For some reason the client stunnel is not getting my data and > >> > therefore doesn't forward anything over to the server stunnel. I'm not > >> > sure why this is happening, because my program works normally and I've > >> > verified that everything returned success. > >> > > >> > Any ideas? > >> > > >> > - Jeremiah > >> > > >> > ----------------------------- > >> > > >> > ON CLIENT (1.2.3.60) > >> > > >> > Linux > >> > stunnel 4.16 > >> > OpenSSL 0.9.7c > >> > > >> > stunnel.conf is... > >> > pid = > >> > client = yes > >> > > >> > [7033] > >> > accept = 127.0.0.1:7033 > >> > connect = 1.2.3.70:7033 > >> > > >> > ----------------------------- > >> > > >> > ON SERVER (1.2.3.70) > >> > > >> > Windows > >> > stunnel 4.16 windows binary installer (Aug 31 2006) > >> > > >> > stunnel.conf is... > >> > > >> > cert = stunnel.pem > >> > socket = l:TCP_NODELAY=1 > >> > socket = r:TCP_NODELAY=1 > >> > debug = 7 > >> > > >> > [7033] > >> > accept = 1.2.3.60:7033 > >> > connect = 127.0.0.1:10000 > >> > > >> > ----------------------------- > >> > > >> > On client I see this debug... > >> > > >> > Oct 24 14:38:22 stunnel: LOG5[2892:258]: 7033 connected from > >> > 127.0.0.1:10251 > >> > Oct 24 14:38:32 stunnel: LOG3[2892:258]: SSL_read: Connection reset by > >> > peer (104) > >> > Oct 24 14:38:32 stunnel: LOG5[2892:258]: Connection reset: 56 bytes > >> > sent to SSL, 0 bytes send to socket > >> > > >> > ----------------------------- > >> > > >> > On server I see this debug... > >> > > >> > 2006.10.24 14:43:08 LOG7[2596:4068]: 7033 accepted FD=196 from > >> > 1.2.3.60:10252 > >> > 2006.10.24 14:43:08 LOG7[2596:4068]: Creating a new thread > >> > 2006.10.24 14:43:09 LOG7[2596:4068]: New thread created > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 7033 started > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: FD 196 in non-blocking mode > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: TCP_NODELAY option set on local > >> socket > >> > 2006.10.24 14:43:09 LOG5[2596:2372]: 7033 connected from 1.2.3.60:10252 > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): before/accept > >> > initialization > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read > >> > client hello A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write > >> > server hello A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write > >> > certificate A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write > >> > server done A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 flush > >> data > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read > >> > client key exchange A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read > >> > finished A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write > >> > change cipher spec A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write > >> > finished A > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 flush > >> data > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 3 items in the session cache > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client connects > >> (SSL_connect()) > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client connects that finished > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client renegotiations > >> requested > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 5 server connects > >> (SSL_accept()) > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 5 server connects that finished > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 0 server renegotiations > >> requested > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache hits > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache misses > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache timeouts > >> > 2006.10.24 14:43:09 LOG6[2596:2372]: SSL accepted: new session > >> negotiated > >> > 2006.10.24 14:43:09 LOG6[2596:2372]: Negotiated ciphers: AES256-SHA > >> > SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: FD 180 in non-blocking mode > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: 7033 connecting 127.0.0.1:10000 > >> > 2006.10.24 14:43:09 LOG7[2596:2372]: connect_wait: waiting 10 seconds > >> > 2006.10.24 14:43:19 LOG6[2596:2372]: connect_wait: s_poll_wait timeout > >> > 2006.10.24 14:43:19 LOG5[2596:2372]: Connection reset: 0 bytes sent to > >> > SSL, 0 bytes sent to socket > >> > 2006.10.24 14:43:19 LOG7[2596:2372]: 7033 finished (0 left) > >> > _______________________________________________ > >> > stunnel-users mailing list > >> > stunnel-users(a)mirt.net > >> > http://stunnel.mirt.net/mailman/listinfo/stunnel-users > >> > > >> > >> > >> > > > > > _______________________________________________ > stunnel-users mailing list > stunnel-users(a)mirt.net > http://stunnel.mirt.net/mailman/listinfo/stunnel-users > > > >

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Trying to redirect with stunnel - seems to hang
by Len DiMaggio 26 Oct '06

26 Oct '06

'Evening everyone, I'm wondering if anyone has already seen a problem like this. Background - I'm trying to use stunnel to act as an SSL server and redirect connections so that I can use the JMeter script recorder to build automated tests for an app's web GUI. (The recorder does not support SSL.) The software versions are: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 I'm able to set up the redirection, and everything in the stunnel log looks OK - and, this is just making the connection manually - without JMeter - but trying to access the target app just hangs in the browser with a "connecting to..." status message. Here's the stunnel config file that I'm using - the log is attached. client=yes output=/tmp/stunnel.log debug=debug [8084] accept=hostname:8079 connect=hostname:8084 Interestingly - when I kill the stunnel process, the browser displays (most of) the target app's top level page. Thanks in advance, Len DiMaggio ldimaggi(a)redhat.com The stunnel log sez: 2006.10.24 04:58:33 LOG5[5869:3086362304]: stunnel 4.15 on i686-redhat-linux-gnu with OpenSSL 0.9.8b 04 May 2006 2006.10.24 04:58:33 LOG5[5869:3086362304]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP 2006.10.24 04:58:33 LOG6[5869:3086362304]: file ulimit = 1024 (can be changed with 'ulimit -n') 2006.10.24 04:58:33 LOG6[5869:3086362304]: poll() used - no FD_SETSIZE limit for file descriptors 2006.10.24 04:58:33 LOG5[5869:3086362304]: 500 clients allowed 2006.10.24 04:58:33 LOG7[5869:3086362304]: FD 4 in non-blocking mode 2006.10.24 04:58:33 LOG7[5869:3086362304]: FD 5 in non-blocking mode 2006.10.24 04:58:33 LOG7[5869:3086362304]: FD 6 in non-blocking mode 2006.10.24 04:58:33 LOG7[5869:3086362304]: SO_REUSEADDR option set on accept socket 2006.10.24 04:58:33 LOG7[5869:3086362304]: 8084 bound to 10.15.49.274:8079 2006.10.24 04:58:33 LOG7[5870:3086362304]: Created pid file /var/run/stunnel.pid 2006.10.24 04:58:52 LOG7[5870:3086362304]: 8084 accepted FD=7 from 172.16.83.99:58417 2006.10.24 04:58:52 LOG7[5870:3086359440]: 8084 started 2006.10.24 04:58:52 LOG7[5870:3086359440]: FD 7 in non-blocking mode 2006.10.24 04:58:52 LOG7[5870:3086359440]: FD 8 in non-blocking mode 2006.10.24 04:58:52 LOG7[5870:3086359440]: FD 9 in non-blocking mode 2006.10.24 04:58:52 LOG7[5870:3086362304]: Cleaning up the signal pipe 2006.10.24 04:58:52 LOG6[5870:3086362304]: Child process 5874 finished with code 0 2006.10.24 04:58:52 LOG7[5870:3086359440]: Connection from 172.16.83.99:58417 permitted by libwrap 2006.10.24 04:58:52 LOG5[5870:3086359440]: 8084 connected from 172.16.83.99:58417 2006.10.24 04:58:52 LOG7[5870:3086359440]: FD 8 in non-blocking mode 2006.10.24 04:58:52 LOG7[5870:3086359440]: 8084 connecting 10.15.49.274:8084 2006.10.24 04:58:52 LOG7[5870:3086359440]: connect_wait: waiting 10 seconds 2006.10.24 04:58:52 LOG7[5870:3086359440]: connect_wait: connected 2006.10.24 04:58:52 LOG7[5870:3086359440]: Remote FD=8 initialized 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): before/connect initialization 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 write client hello A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 read server hello A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 read server certificate A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 read server done A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 write client key exchange A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 write change cipher spec A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 write finished A 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 flush data 2006.10.24 04:58:52 LOG7[5870:3086359440]: SSL state (connect): SSLv3 read finished A 2006.10.24 04:58:52 LOG7[5870:3086359440]: 1 items in the session cache 2006.10.24 04:58:52 LOG7[5870:3086359440]: 1 client connects (SSL_connect()) 2006.10.24 04:58:52 LOG7[5870:3086359440]: 1 client connects that finished 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 client renegotiations requested 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 server connects (SSL_accept()) 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 server connects that finished 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 server renegotiations requested 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 session cache hits 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 session cache misses 2006.10.24 04:58:52 LOG7[5870:3086359440]: 0 session cache timeouts 2006.10.24 04:58:52 LOG6[5870:3086359440]: SSL connected: new session negotiated 2006.10.24 04:58:52 LOG6[5870:3086359440]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 -- Len DiMaggio (ldimaggi(a)redhat.com) Red Hat USA 10 Technology Park Drive Westford, MA 01886 tel: 978.392.3179 cell: 617.872.3673 http://www.redhat.com

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status of www.stunnel.org
by Steven Van Acker 26 Oct '06

26 Oct '06

Hi, I noticed how the website http://www.stunnel.org is out of sync with the latest releases of stunnel. Are there plans to update this site ? And if not, would it be possible to redirect its visitors to http://stunnel.mirt.net/ automatically ? kind regards, -- Steven Van Acker -- My amazon wishlist: http://www.amazon.com/gp/registry/1DB4XNEIEQBPB

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Stunnel client not sending data
by Jeremiah Martell 26 Oct '06

26 Oct '06

Hello, I have a program that opens up a connection to port 10000 of a server and sends it some data. It works normally. I'm trying to "stunnel" both ends. In my program I create a socket, connect to local port 7033, send my data, and close the socket. I verified that every function call returns success (socket, setsockopt (for TCP_NODELAY), gethostbyname, connect, and send). >From what the logs show below, it seems that server stunnel gets the connection from the client stunnel, they successfully negotiate the SSL stuff, then the client stunnel waits for any data to proxy to the server stunnel. The server stunnel is waiting too, and after 10 seconds of no data, it closes the socket. For some reason the client stunnel is not getting my data and therefore doesn't forward anything over to the server stunnel. I'm not sure why this is happening, because my program works normally and I've verified that everything returned success. Any ideas? - Jeremiah ----------------------------- ON CLIENT (1.2.3.60) Linux stunnel 4.16 OpenSSL 0.9.7c stunnel.conf is... pid = client = yes [7033] accept = 127.0.0.1:7033 connect = 1.2.3.70:7033 ----------------------------- ON SERVER (1.2.3.70) Windows stunnel 4.16 windows binary installer (Aug 31 2006) stunnel.conf is... cert = stunnel.pem socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 [7033] accept = 1.2.3.60:7033 connect = 127.0.0.1:10000 ----------------------------- On client I see this debug... Oct 24 14:38:22 stunnel: LOG5[2892:258]: 7033 connected from 127.0.0.1:10251 Oct 24 14:38:32 stunnel: LOG3[2892:258]: SSL_read: Connection reset by peer (104) Oct 24 14:38:32 stunnel: LOG5[2892:258]: Connection reset: 56 bytes sent to SSL, 0 bytes send to socket ----------------------------- On server I see this debug... 2006.10.24 14:43:08 LOG7[2596:4068]: 7033 accepted FD=196 from 1.2.3.60:10252 2006.10.24 14:43:08 LOG7[2596:4068]: Creating a new thread 2006.10.24 14:43:09 LOG7[2596:4068]: New thread created 2006.10.24 14:43:09 LOG7[2596:2372]: 7033 started 2006.10.24 14:43:09 LOG7[2596:2372]: FD 196 in non-blocking mode 2006.10.24 14:43:09 LOG7[2596:2372]: TCP_NODELAY option set on local socket 2006.10.24 14:43:09 LOG5[2596:2372]: 7033 connected from 1.2.3.60:10252 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): before/accept initialization 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read client hello A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write server hello A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write certificate A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write server done A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 flush data 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read client key exchange A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 read finished A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write change cipher spec A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 write finished A 2006.10.24 14:43:09 LOG7[2596:2372]: SSL state (accept): SSLv3 flush data 2006.10.24 14:43:09 LOG7[2596:2372]: 3 items in the session cache 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client connects (SSL_connect()) 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client connects that finished 2006.10.24 14:43:09 LOG7[2596:2372]: 0 client renegotiations requested 2006.10.24 14:43:09 LOG7[2596:2372]: 5 server connects (SSL_accept()) 2006.10.24 14:43:09 LOG7[2596:2372]: 5 server connects that finished 2006.10.24 14:43:09 LOG7[2596:2372]: 0 server renegotiations requested 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache hits 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache misses 2006.10.24 14:43:09 LOG7[2596:2372]: 1 session cache timeouts 2006.10.24 14:43:09 LOG6[2596:2372]: SSL accepted: new session negotiated 2006.10.24 14:43:09 LOG6[2596:2372]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2006.10.24 14:43:09 LOG7[2596:2372]: FD 180 in non-blocking mode 2006.10.24 14:43:09 LOG7[2596:2372]: 7033 connecting 127.0.0.1:10000 2006.10.24 14:43:09 LOG7[2596:2372]: connect_wait: waiting 10 seconds 2006.10.24 14:43:19 LOG6[2596:2372]: connect_wait: s_poll_wait timeout 2006.10.24 14:43:19 LOG5[2596:2372]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2006.10.24 14:43:19 LOG7[2596:2372]: 7033 finished (0 left)

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[OT] Questions about OpenSSL
by Gonzalo Diethelm 25 Oct '06

25 Oct '06

Hello everyone, I have a slightly off-topic question but one I think stunnel's developers are in a good position to assist me with. I need to implement what amounts to an embedded web server for a process that will be deployed on a "hostile" server (Win32), meaning that I don't want the people in that server to mess around with either the process or the network traffic to/from the process. The goal is to deploy a binary and a set of DLLs to the hostile server (no configuration files). To this effect, I have found a couple of usable HTTP server libraries, and I have implemented the functionality I need over clean HTTP. Now, I would like to use SSL to encrypt the data coming and going to my process; alas, I have not found any open source HTTP library that also supports HTTPS. Therefore, I have come to the conclusion that I will have to integrate OpenSSL into one of the HTTP libraries myself. The first question is: how difficult is it to integrate OpenSSL in "server mode" into an application? I tried taking a peek at Apache's mod_ssl, but being unfamiliar with Apache's internals, I was completely lost. Then it occurred to me that stunnel must do something similar to what I need, and indeed I could follow the code in stunnel to a point; before going any further, I wanted to first hear comments, opinions and hints from the developers. It also occurred to me that I could do what I need if stunnel offered some kind of "in process" handling of requests: instead of forwarding to a certain host:port the requests it gets, maybe stunnel itself could be configured to process the requests somehow, generate the responses and send them back; for instance, what I need to do is basically query a MySQL DB and send some records back. I am pretty sure this is not supported in stunnel today, but if it is something that anyone (besides me) sees as useful, I could volunteer to do at least part of the development. Alternatively, please feel free to educate me on why this is a moronic idea... In any case, thanks for a great product and best regards, -- Gonzalo Diethelm gonzalo.diethelm(a)aditiva.com

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Connection problems and TCP frame checksum errors
by Tommi Nieminen 23 Oct '06

23 Oct '06

I have the following kind of test environment: SSL clients call a public ip address from which the calls are forwarded to a linux server with Stunnel. The linux server is in a private network. Stunnel decrypts the data and sends it forward. I have been testing this with a browser, monitoring the traffic on the server to see that Stunnel forwards the calls. Some strange things happen there that I can't explain. First of all: sometimes the calls go through the server as expected, sometimes the server doesn't respond in any way to the client. If I have two terminal windows open, one with tcpdump and another with tail -f stunnel.log - nothing comes into the log in spite of the incoming connections attempts. Then on other occasions when the calls come to the server, it forwards them beautifully to the address and port set in the configuration file. Does anyone have any clue, what this could be due to? I haven't been able to explain why it sometimes works and sometimes doesn't. Another thing that bothers me is, that sometimes there are TCP frames with incorrect checksum. I've monitored with Ethereal and tcpdump. Both show incorrect frames, and they are always from the stunnel-end of the connection. What could be the cause of those broken frames? Tommi Nieminen -------------------------------------------------------- My stunnel.conf looks like this: (any constructive criticism would be welcome :-)) CAfile = /home/tommi/cert/7/demoCA/cacert.pem cert = /home/tommi/cert/7/newcert.pem key = /home/tommi/cert/7/newkey.pem socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 output = /var/log/stunnel/stunnel.log pid = /var/run/stunnel/stunnel.pid debug = 7 client = no [https] accept = 443 connect = 192.168.10.17:5010 TIMEOUTclose = 0 -------------------------------------------------------- A succesful connection from stunnel.log: 2006.10.09 18:01:43 LOG7[11889:3083744960]: https accepted FD=7 from 131.177.254.92:2689 2006.10.09 18:01:43 LOG7[11889:3083742128]: https started 2006.10.09 18:01:43 LOG7[11889:3083742128]: FD 7 in non-blocking mode 2006.10.09 18:01:43 LOG7[11889:3083742128]: TCP_NODELAY option set on local socket 2006.10.09 18:01:43 LOG5[11889:3083742128]: https connected from 131.177.254.92:2689 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): before/accept initialization 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 read client hello A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 write server hello A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 write certificate A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 write server done A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 flush data 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 read client key exchange A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 read finished A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 write change cipher spec A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 write finished A 2006.10.09 18:01:43 LOG7[11889:3083742128]: SSL state (accept): SSLv3 flush data 2006.10.09 18:01:43 LOG7[11889:3083742128]: 2 items in the session cache 2006.10.09 18:01:43 LOG7[11889:3083742128]: 0 client connects (SSL_connect()) 2006.10.09 18:01:43 LOG7[11889:3083742128]: 0 client connects that finished 2006.10.09 18:01:43 LOG7[11889:3083742128]: 0 client renegotiations requested 2006.10.09 18:01:43 LOG7[11889:3083742128]: 8 server connects (SSL_accept()) 2006.10.09 18:01:43 LOG7[11889:3083742128]: 7 server connects that finished 2006.10.09 18:01:43 LOG7[11889:3083742128]: 0 server renegotiations requested 2006.10.09 18:01:43 LOG7[11889:3083742128]: 4 session cache hits 2006.10.09 18:01:43 LOG7[11889:3083742128]: 1 session cache misses 2006.10.09 18:01:43 LOG7[11889:3083742128]: 1 session cache timeouts 2006.10.09 18:01:43 LOG6[11889:3083742128]: SSL accepted: new session negotiated 2006.10.09 18:01:43 LOG6[11889:3083742128]: Negotiated ciphers: AES256-SHA SSLv3 Kx=RSA Au=RSA Enc=AES(256) Mac=SHA1 2006.10.09 18:01:43 LOG7[11889:3083742128]: FD 8 in non-blocking mode 2006.10.09 18:01:43 LOG7[11889:3083742128]: https connecting 192.168.10.17:5010 2006.10.09 18:01:43 LOG7[11889:3083742128]: connect_wait: waiting 10 seconds 2006.10.09 18:01:43 LOG7[11889:3083742128]: connect_wait: connected 2006.10.09 18:01:43 LOG7[11889:3083742128]: Remote FD=8 initialized 2006.10.09 18:01:43 LOG7[11889:3083742128]: TCP_NODELAY option set on remote socket 2006.10.09 18:02:45 LOG7[11889:3083742128]: Socket closed on read 2006.10.09 18:02:45 LOG7[11889:3083742128]: SSL write shutdown 2006.10.09 18:02:45 LOG7[11889:3083742128]: SSL alert (write): warning: close notify 2006.10.09 18:02:45 LOG7[11889:3083742128]: SSL_shutdown retrying 2006.10.09 18:02:45 LOG7[11889:3083742128]: SSL doesn't need to read or write 2006.10.09 18:02:45 LOG6[11889:3083742128]: s_poll_wait timeout: connection close 2006.10.09 18:02:45 LOG5[11889:3083742128]: Connection closed: 0 bytes sent to SSL, 405 bytes sent to socket 2006.10.09 18:02:45 LOG7[11889:3083742128]: https finished (0 left) (and the failed connections leave also no mark in the log, but tcpdump sees the attempts on the server) -------------------------------------------------------- A sample of tcpdump's output with incorrect checksum: 18:02:45.150656 IP (tos 0x0, ttl 64, id 11218, offset 0, flags [DF], proto: TCP (6), length: 77) 192.168.20.18.https > 131.177.254.92.2689: P, cksum 0x5708 (incorrect (-> 0xf1bf), 1035:1072(37) ack 756 win 7504

2 6

Thank you very much for all your donations
by Michal Trojnara 21 Oct '06

21 Oct '06

Dear Users, I want you to know how much grateful I am for all your donations. Thank you very much. Some day stunnel may be full-time job. 8-) Even now sponsored features make a substantial addition to my budget. BTW: I have updated currency to USD. I hope it's more convenient. http://stunnel.mirt.net/ Best regards, Mike

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