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AUTO: Jean Daros is out of the office (returning 02/13/2012)
by Jean Daros 11 Feb '12

11 Feb '12

I am out of the office until 02/13/2012. If you need immediate assistance, please contact the helpdesk at ext. 1540. Thank you. Note: This is an automated response to your message "stunnel-users Digest, Vol 91, Issue 6" sent on 2/11/2012 6:00:01 AM. This is the only notification you will receive while this person is away.

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(no subject)
by Jean Daros 07 Feb '12

07 Feb '12

We are using version 4.33 with RedRock Software - Tutortrac Stunnel will crash. The stunnel service terminated unexpectedly. Faulting application stunnel.exe, veraion 0.0.0.0, faulting module libeay32.dll, version 1.0.0.0 fault address 0x000731ee. Any ideas? -Jean Berkeley College

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Improving SSL security and protecting against the BEAST attack
by Shannon Carver 06 Feb '12

06 Feb '12

Hi all, Long time lurker, but first time poster on the Stunnel mailing list. I'm currently entering into a business partnership with a prominent media group, and as such they've got some strict guidelines by which their partners should abide by when it comes to Security/Encryption, both for brand protection, and making sure that both sides are sufficiently covered (at least from a general scan point of view). Basically the big thing that is coming up in my testing now (predominantly using the Qualysis tool at www.ssllabs.com) is that I'm vulnerable to the BEAST attack, CBC-Mode vulnerabilities and a potential issue of DoS attack due to server accepting Client Side Re-negotiation. I've spent days now trawling the web looking for a solution, but haven't really found anything of use yet, short of disabling CBC Ciphers completely (e.g 'cipher = RC4-SHA:RC4-MD5:!SSLv2:!ADH:!EDH:!EXP:!aNULL:!eNULL:!NULL' or similar), but I fear this me be too restrictive when it comes to client support. I guess my question is, are there other stunnel users who've been in the same situation, and is there a recommended cipher/options list when using Stunnel for HTTPS? Thanks in advance Shannon

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Re: [stunnel-users] No SSL handshake between stunnel in client mode and SSL server
by Michal Trojnara 06 Feb '12

06 Feb '12

On Wednesday, 1 of February 2012, Jose Alf. wrote: > Looks like your client connects for a very short time, sends just 1 byte, > the disconnects. > > Mike can correct me if I am wrong. [cut] > 2012.01.31 12:57:12 LOG6[6748:6808]: SSL connected: new session negotiated [cut] > 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 As requested: The log says "SSL connected" (as opposed to "SSL accepted"), so this service was configured in client mode, so SSL=server side and socket=client side. 200 bytes sent to SSL were received from socket (i.e. client), and 1 byte sent to socket were received from SSL (i.e. server). Otherwise you are correct. Mike

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No SSL handshake between stunnel in client mode and SSL server
by Denis Berezhnoy 01 Feb '12

01 Feb '12

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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Possible use-after-free in stunnel 4.52
by David Shaw 01 Feb '12

01 Feb '12

Hello, I am using stunnel 4.52 in client mode with exec and connect. The client program that stunnel execs periodically exits, and is properly re-started by stunnel, as I have "retry = yes" set. However, after a retry, I occasionally get a segfault inside one of the OpenSSL libraries. It does not happen right away, but once it happens, every retry causes the same segfault. I did some debugging and it seems that what is happening during a retry is that the SSL connection is brought down in client_run(), then is freed via SSL_free(c->ssl). However, it seems that c->ssl is used after this free, for example in connect_local(), which calls SSL_get_peer_certificate(c->ssl). When exec, connect, and retry are all set, client_main() will call connect_local() after client_run() exits. This patch seems to resolve the issue: --- client.c.orig 2012-01-11 10:43:33.000000000 -0500 +++ client.c 2012-01-31 18:02:19.155213010 -0500 @@ -162,6 +162,7 @@ if(c->ssl) { /* SSL initialized */ SSL_set_shutdown(c->ssl, SSL_SENT_SHUTDOWN|SSL_RECEIVED_SHUTDOWN); SSL_free(c->ssl); + c->ssl=NULL; ERR_remove_state(0); } For completeness, here's my stunnel.conf: client = yes sslVersion = SSLv3 pid = /var/run/stunnel.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 foreground=yes [experiment] connect = x.x.x.x:443 exec = testprog retry = yes David

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stunnel and connection alerts for Windows
by John A. Wallace 31 Jan '12

31 Jan '12

Hello. It would be helpful to me to see a little popup window notification of connections or data transfers made through Stunnel, a small and unobtrusive alert of such kind as not requiring me to open another Window, etc.. One thought I have along these lines is to have the stunnel Log Window to serve this purpose by having a configuration option for it to open in a small window by the system alert toolbar on the bottom right, providing a one-liner or abbreviated rendition of its current logging text. I do not know of a way to make this happen within stunnel itself, but if there is functionality of this sort already available, please advise. Another program that comes to mind with this sort of purpose would be Growl, which allows developers to make plugins to create this effect. http://www.growlforwindows.com/gfw/apps.aspx. Is there anyone else here who would find this useful or who is aware of work along these lines? Thanks. John

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stunnel and local proxies
by John A. Wallace 30 Jan '12

30 Jan '12

Hello. At times I would like to have Stunnel (in Windows OS) running through a proxy on localhost, say, a socks proxy. Based on what I have seen and read here and in the list archives about that, although admittedly I have not yet read every single thread, I am inclined to say that it is not designed to do so easily if at all. Someone even suggested to me that these settings alone would allow running it over a socks proxy on my machine: ; these settings relate to using stunnel through a proxy ;protocol=connect ;protocolHost=127.0.0.1:portXYZ I tested this on my system but it failed to work. On the other hand I have had success using a program like socat for this purpose. Am I correct in thinking that the above settings alone are not going to do it or do I need additional settings with them for this purpose, or is it not going to work with Stunnel alone? Thanks.

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Stunnel configuration to forward IP address
by Rajat Garg 29 Jan '12

29 Jan '12

Folks, I have done a setup where I am using Stunnel to forward incoming HTTPS requests to HaProxy. But, I am unable to get IP address at HaProxy level (determined by looking at logs) - Here is the configuration file for Stunnel - cert = /etc/stunnel/ssl.crt key = /etc/apache2/ssl.key/socialappshq.com.key sslVersion = all chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 pid = /stunnel.pid ; Some performance tunings socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 CAfile = /etc/apache2/ssl.key/ca.pem output = /var/log/stunnel4/stunnel.log [proxy] accept = 443 connect = 81 TIMEOUTclose = 0 Here is the config file for HaProxy - global log 127.0.0.1 local0 log 127.0.0.1 local1 notice maxconn 4096 user haproxy group haproxy defaults log global option httplog option dontlognull mode http stats enable retries 3 option redispatch maxconn 2000 timeout client 40s # Client and server timeout must match the longest timeout server 40s # time we may wait for a response from the server. timeout queue 40s # Don't queue requests too long if saturated. timeout connect 20s # There's no reason to change this one. timeout http-request 30s # A complete request may never take that long. frontend webfarm_ssl *:81 accept-proxy option httpclose option forwardfor acl is_social hdr_dom(host) -i socialappshq.com use_backend socialappshq_ssl if is_social backend socialappshq_ssl balance roundrobin cookie JSESSIONID prefix option httpchk GET /check.txt HTTP/1.0 server web2 ec2-XX.us-west-1.compute.amazonaws.com:8080 cookie B check inter 2000 rise 2 fall 3 What else should I do so that IP address passes from Stunnel to Haproxy? Your help will be extremely appreciated. Thx Rajat Garg https://www.socialappshq.com

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patch for using stunnel as client with pkcs11-engine and opensc smartcard
by Märt Laak 29 Jan '12

29 Jan '12

Dear stunnel managers, I would like to inform you that there exist some incompatibility with stunnel and openssl pkcs11-engine with external PIN entry device (like RSA smartcard using opensc) in Linux. We use this config to load openssl engine stunnel.conf: --- engine=dynamic engineCtrl=SO_PATH:/usr/lib/engines/engine_pkcs11.so engineCtrl=ID:pkcs11 engineCtrl=LIST_ADD:1 engineCtrl=LOAD engineCtrl=MODULE_PATH:/usr/lib/opensc-pkcs11.so engineCtrl=INIT --- Problem is, with this setup stunnel does not allow user to enter PIN for the secret key. Instead it tries to get secret key without PIN, 3 times (and then therefore usually blocks card PIN) and retires: ---- Initializing engine 1 Engine 1 initialized PRNG seeded successfully Certificate: mart.pem Certificate loaded Key file: id_01 error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key error queue: 800050A0 : error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect Wrong PIN: retrying error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key error queue: 800050A0 : error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect Wrong PIN: retrying error queue: 26096080 : error:26096080:engine routines:ENGINE_load_private_key:failed loading private key ENGINE_load_private_key: 800050A0: error:800050A0:PKCS11 library:PKCS11_login:PIN incorrect ---- I discovered workaround that is valid form version 4.26 till current 4.34, as follows, NULL-ing the ui_data.method property in ctx.c: --- diff -cr stunnel-4.34/src/ctx.c stunnel-4.34-patched/src/ctx.c *** stunnel-4.34/src/ctx.c 2010-09-14 18:08:43.000000000 +0300 --- stunnel-4.34-patched/src/ctx.c 2010-09-28 21:56:36.219081931 +0300 *************** *** 304,309 **** --- 304,310 ---- UI_method_set_reader(ui_method, pin_cb); #else /* USE_WIN32 */ ui_method=UI_OpenSSL(); + ui_data.section = NULL; #endif /* USE_WIN32 */ if(section->engine) for(i=1; i<=3; i++) { --- After that patch private key loads correctly: --- Initializing engine 1 Engine 1 initialized PRNG seeded successfully Certificate: mart.pem Certificate loaded Key file: id_01 private key loaded --- It would be nice if: * somebody investigates more precisely why the OpenSSL PIN entry is not showing with unpached stunnel * include my or better patch for this situation Thank you very much for excellent piece of software! With best regards, Märt Laak

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STunnel on Windows (2008R2 Server)
by Skinner, Robert 28 Jan '12

28 Jan '12

I am attempting to use stunnel to encrypt traffic between our backup client (Window2008R2) and our NetApp filer, but I'm not having any luck We would like to use the stunnel to redirect the port 80 calls to the filer (ubfs2.buffalo.edu) to port 443. Be design, the backup client (IBM Tivoli/TSM V6.2.4) makes a call to the Netapp over http.admin interface to tell it to create a snapshot. The filer listens on https.admin (not http.admin), and we don't want to turn on http.admin for security reasons. I've included the stunnel.config file, hosts file, and the output below. If anyone could give us a hand here it would be much appreciated. We tested this config on a Mac laptop and it works just fine, so I would assume that it has something to do with Windows2008R2 Stunnel.config debug = 7 client = yes [snapdiff] accept = localhost:80 connect = 128.205.5.55:443 sslVersion = all hosts 127.0.0.1 localhost ubfs2.buffalo.edu output 7[1596:4336]: No limit detected for the number of clients 2012.01.27 15:16:30 LOG5[1596:4336]: stunnel 4.52 on x86-pc-mingw32-gnu platform 2012.01.27 15:16:30 LOG5[1596:4336]: Compiled/running with OpenSSL 0.9.8s-fips 4 Jan 2012 2012.01.27 15:16:30 LOG5[1596:4336]: Threading:WIN32 SSL:ENGINE,FIPS Auth:none Sockets:SELECT,IPv6 2012.01.27 15:16:30 LOG5[1596:4336]: Reading configuration from file stunnel.conf 2012.01.27 15:16:30 LOG5[1596:4336]: FIPS mode is enabled 2012.01.27 15:16:30 LOG7[1596:4336]: Compression not enabled 2012.01.27 15:16:30 LOG7[1596:4336]: Snagged 64 random bytes from C:/.rnd 2012.01.27 15:16:30 LOG7[1596:4336]: Wrote 1024 new random bytes to C:/.rnd 2012.01.27 15:16:30 LOG7[1596:4336]: PRNG seeded successfully 2012.01.27 15:16:31 LOG6[1596:4336]: Initializing SSL context for service snapdiff 2012.01.27 15:16:31 LOG7[1596:4336]: SSL options set: 0x00000004 2012.01.27 15:16:31 LOG6[1596:4336]: SSL context initialized 2012.01.27 15:16:31 LOG5[1596:4336]: Configuration successful 2012.01.27 15:16:31 LOG7[1596:4336]: Service snapdiff bound FD=396 to 127.0.0.1:80 2012.01.27 15:16:40 LOG7[1596:4336]: Service snapdiff accepted FD=452 from 127.0.0.1:51366 2012.01.27 15:16:40 LOG7[1596:4336]: Creating a new thread 2012.01.27 15:16:40 LOG7[1596:4336]: New thread created 2012.01.27 15:16:40 LOG7[1596:4336]: Service snapdiff accepted FD=460 from 127.0.0.1:51367 2012.01.27 15:16:40 LOG7[1596:4336]: Creating a new thread 2012.01.27 15:16:40 LOG7[1596:4336]: New thread created 2012.01.27 15:16:40 LOG7[1596:5080]: Service snapdiff started 2012.01.27 15:16:40 LOG5[1596:5080]: Service snapdiff accepted connection from 127.0.0.1:51366 2012.01.27 15:16:40 LOG6[1596:5080]: connect_blocking: connecting 128.205.5.55:443 2012.01.27 15:16:40 LOG7[1596:5080]: connect_blocking: s_poll_wait 128.205.5.55:443: waiting 10 seconds 2012.01.27 15:16:40 LOG7[1596:4720]: Service snapdiff started 2012.01.27 15:16:40 LOG5[1596:4720]: Service snapdiff accepted connection from 127.0.0.1:51367 2012.01.27 15:16:40 LOG6[1596:4720]: connect_blocking: connecting 128.205.5.55:443 2012.01.27 15:16:40 LOG7[1596:4720]: connect_blocking: s_poll_wait 128.205.5.55:443: waiting 10 seconds 2012.01.27 15:16:40 LOG5[1596:4720]: connect_blocking: connected 128.205.5.55:443 2012.01.27 15:16:40 LOG5[1596:4720]: Service snapdiff connected remote server from 128.205.4.234:51369 2012.01.27 15:16:40 LOG7[1596:4720]: Remote FD=508 initialized 2012.01.27 15:16:40 LOG3[1596:4720]: SSL_connect: 14077410: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure 2012.01.27 15:16:40 LOG5[1596:4720]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2012.01.27 15:16:40 LOG7[1596:4720]: Service snapdiff finished (1 left) 2012.01.27 15:16:43 LOG5[1596:5080]: connect_blocking: connected 128.205.5.55:443 2012.01.27 15:16:43 LOG5[1596:5080]: Service snapdiff connected remote server from 128.205.4.234:51368 2012.01.27 15:16:43 LOG7[1596:5080]: Remote FD=480 initialized 2012.01.27 15:16:43 LOG3[1596:5080]: SSL_connect: 14077410: error:14077410:SSL routines:SSL23_GET_SERVER_HELLO:sslv3 alert handshake failure 2012.01.27 15:16:43 LOG5[1596:5080]: Connection reset: 0 bytes sent to SSL, 0 bytes sent to socket 2012.01.27 15:16:43 LOG7[1596:5080]: Service snapdiff finished (0 left)

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stunnel+memoq error | urgent feedback needed
by Bob Makovei 27 Jan '12

27 Jan '12

Hello there! I am a new stunnel user, working as a translator. Please, find attached a log report about a connection error. I've tried everything I could to make stunnel work for memoq. What's wrong? I would much appreciate your quck input... Kind regards, Bob Bob Makovei Economist, Certified Translator, Investment Consultant | <http://www.makovei.me/> www.makovei.me | <mailto:bob@makovei.me> bob(a)makovei.me Exim Pro Ltd., 25 Draga Street, Bekes H-5630, Hungary | +36.70.324.7424 (t) | +36.70.908.7704 (f) US: +1.512.682.0817 (vm) | +1.781.723.5861 (f) | UK: +44.871.526.2661 (f) | mr19740809 (skype)

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stunnel and socat
by John A. Wallace 26 Jan '12

26 Jan '12

Hello. I use socat to connect stunnel to a socks proxy on my client workstation running windows. the socks proxy then connects to a news server on the internet. The initial connection works just fine and it appears to stay connected while I am transferring data and for a while afterwards; but after a period of idle connection say five or ten minutes, I get a message from my network adaptor popup saying that the connection stunnel had to my localhost has failed. Any ideas on how I can make the connection between stunnel and localhost persist longer during periods of inactivity? I would like it to stay connected until I purposely stop it. Below is the relevant section of "stunnel.conf". [newsreader_to_newsserver] accept = 127.0.0.1:120 connect = 127.0.0.1:5630 CAfile = peer-news_certificate.pem verify = 3

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stunnel+memoq error
by Bob Makovei 26 Jan '12

26 Jan '12

Hello there! I am a new stunnel user, working as a translator. Please, find attached a log report about a connection error. I've tried everything I could to make stunnel work for memoq. What's wrong? Kind regards, Bob Bob Makovei Economist, Certified Translator, Investment Consultant | <http://www.makovei.me/> www.makovei.me | <mailto:bob@makovei.me> bob(a)makovei.me Exim Pro Ltd., 25 Draga Street, Bekes H-5630, Hungary | +36.70.324.7424 (t) | +36.70.908.7704 (f) US: +1.512.682.0817 (vm) | +1.781.723.5861 (f) | UK: +44.871.526.2661 (f) | mr19740809 (skype)

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Strange Log
by Hamid.Shahid＠sungard.com 26 Jan '12

26 Jan '12

Hi Jose, I am getting the following log, when I am trying connect my program with Stunnel, which is connected to a remote server using SSL. Can you please have a look and help me understand what is happening and what can be the reason? Many thanks! 2012.01.25 18:50:12 LOG5[8384:2416]: Reading configuration from file stunnel.conf 2012.01.25 18:50:12 LOG7[8384:2416]: Snagged 64 random bytes from C:/.rnd 2012.01.25 18:50:12 LOG7[8384:2416]: Wrote 1024 new random bytes to C:/.rnd 2012.01.25 18:50:12 LOG7[8384:2416]: PRNG seeded successfully 2012.01.25 18:50:12 LOG6[8384:2416]: Initializing SSL context for service SSLHOST 2012.01.25 18:50:12 LOG7[8384:2416]: Certificate: ABC_Cert.pem 2012.01.25 18:50:12 LOG7[8384:2416]: Certificate loaded 2012.01.25 18:50:12 LOG7[8384:2416]: Key file: ABC_Cert_key.pem 2012.01.25 18:50:30 LOG7[8384:2416]: Private key loaded 2012.01.25 18:50:30 LOG7[8384:2416]: SSL options set: 0x00180004 2012.01.25 18:50:30 LOG6[8384:2416]: SSL context initialized 2012.01.25 18:50:30 LOG5[8384:2416]: Configuration successful 2012.01.25 18:50:30 LOG7[8384:2416]: accept socket: FD=652 allocated (non-blocking mode) 2012.01.25 18:50:30 LOG7[8384:2416]: Option SO_REUSEADDR set on accept socket 2012.01.25 18:50:30 LOG7[8384:2416]: Service SSLHOST bound to 127.0.0.1:2525 2012.01.25 18:50:30 LOG7[8384:2416]: Service SSLHOST opened FD=652 2012.01.25 18:50:46 LOG7[8384:2416]: local socket: FD=752 allocated (non-blocking mode) 2012.01.25 18:50:46 LOG7[8384:2416]: Service SSLHOST accepted FD=752 from 127.0.0.1:52075 2012.01.25 18:50:46 LOG7[8384:2416]: Creating a new thread 2012.01.25 18:50:46 LOG7[8384:2416]: New thread created 2012.01.25 18:50:46 LOG7[8384:12664]: Service SSLHOST started 2012.01.25 18:50:46 LOG7[8384:12664]: Option TCP_NODELAY set on local socket 2012.01.25 18:50:46 LOG5[8384:12664]: Service SSLHOST accepted connection from 127.0.0.1:52075 2012.01.25 18:50:46 LOG7[8384:12664]: remote socket: FD=768 allocated (non-blocking mode) 2012.01.25 18:50:46 LOG6[8384:12664]: connect_blocking: connecting <server_ip : port> 2012.01.25 18:50:46 LOG7[8384:12664]: connect_blocking: s_poll_wait <server_ip : port>: waiting 10 seconds 2012.01.25 18:50:46 LOG5[8384:12664]: connect_blocking: connected <server_ip : port> 2012.01.25 18:50:46 LOG5[8384:12664]: Service SSLHOST connected remote server from <server_ip : port> 2012.01.25 18:50:46 LOG7[8384:12664]: Remote FD=768 initialized 2012.01.25 18:50:46 LOG7[8384:12664]: Option TCP_NODELAY set on remote socket 2012.01.25 18:50:46 LOG7[8384:12664]: SNI: host name: <ip> 2012.01.25 18:50:46 LOG7[8384:12664]: Peer certificate was cached (1976 bytes) 2012.01.25 18:50:46 LOG6[8384:12664]: SSL connected: new session negotiated 2012.01.25 18:50:46 LOG6[8384:12664]: Negotiated ciphers: RC4-MD5 SSLv3 Kx=RSA Au=RSA Enc=RC4(128) Mac=MD5 2012.01.25 18:50:46 LOG7[8384:12664]: SSL closed on SSL_read 2012.01.25 18:50:46 LOG7[8384:12664]: Sending socket write shutdown 2012.01.25 18:50:46 LOG7[8384:12664]: Socket closed on read 2012.01.25 18:50:46 LOG7[8384:12664]: Sending SSL write shutdown 2012.01.25 18:50:46 LOG6[8384:12664]: SSL_shutdown successfully sent close_notify 2012.01.25 18:50:46 LOG5[8384:12664]: Connection closed: 133 bytes sent to SSL, 8 bytes sent to socket 2012.01.25 18:50:46 LOG7[8384:12664]: Service SSLHOST finished (0 left) Kind Regards, Hamid Shahid

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Stunnel without certificate
by VANDOOREN, Pascal 25 Jan '12

25 Jan '12

Hello, I have a question, is it possible to use Stunnel without a certification but with a passphrase ? because a use a generated certificate that expired after one year and it's not possible to generate a certificate more than one year .... Kind regards Pascal -- This e-mail is confidential. If you are not the addressee or an authorized recipient of this message, any distribution, copying, publication or use of this information for any purpose is prohibited. Please notify the sender immediately by e-mail and then delete this message. Ce message est confidentiel. Si vous n'etes pas le destinataire designe de ce message ou une personne autorisee a l'utiliser, toute distribution, copie, publication ou usage a quelques fins que ce soit des informations contenues dans ce message sont interdits. Merci d'informer immediatement l'expediteur par messagerie electronique et d'ensuite detruire ce message. --

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certificate authentications
by John A. Wallace 21 Jan '12

21 Jan '12

I have two questions, which I think may be related, regarding how to use the information from stunnel log. I use stunnel to connect to an SMTP server on the internet from my home network, and in particular from my Windows laptop. My stunnel version is this: stunnel 4.50 on x86-pc-mingw32-gnu platform Compiled/running with OpenSSL 0.9.8r-fips 8 Feb 2011 It works well for my purposes, and I can see, by using a program for monitoring process and network connections, that the connections are now secured as expected. However, I believe it can be made more secure if I can utilize the certificate that is offered by the server, but I am not sure how to make that happen. In my stunnel log for the connection, I get this message: Client-mode smtp protocol negotiations started Client-mode smtp protocol negotiations succeeded No peer certificate received SSL connected: new session negotiated Negotiated ciphers: ADH-AES256-SHA SSLv3 Kx=DH Au=None Enc=AES(256) Mac=SHA1 My first question is, how should I go about getting that "No peer certificate received" issue corrected and how do I install it? Secondly, when I issue this command at the cmd shell prompt: openssl s_client -starttls smtp -connect host.server:port The output is lengthy and it includes, among other things, clearly what is identified as a certificate. I have been told that this is a good certificate, and one that I should utilize for an authenticated connection. So, my question is, is this the same certificate that I saw referenced in the log as the "peer certificate", and how do I go about putting this certificate where it belongs in my directory? I know how to copy it and save it as a file, but where do I put it and should it have a special name? If someone wants to direct me to the correct instruction for doing this, that would be fine too. I am just looking for some pointers for assistance. Thanks.

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Re: [stunnel-users] ver 4.5 VS 4.2: running single process now, how to close when all client apps closed?
by Jose Alf. 21 Jan '12

21 Jan '12

All right. I just recompiled against the latest OpenSSL 0.9.8t. Still not enought to tempt you? :) Regards, Jose ________________________________ From: Larisa <larisaka(a)yahoo.com> To: Jose Alf. <josealf(a)rocketmail.com> Sent: Friday, January 20, 2012 5:20 PM Subject: Re: [stunnel-users] ver 4.5 VS 4.2: running single process now, how to close when all client apps closed? Jose, I am thinking to stay with the old version for a little bit longer, though hoping to get newer one 4.5_ soon. Thank you for the offer. Larisa --- On Thu, 1/19/12, Jose Alf. <josealf(a)rocketmail.com> wrote: >From: Jose Alf. <josealf(a)rocketmail.com> >Subject: Re: [stunnel-users] ver 4.5 VS 4.2: running single process now, how to close when all client apps closed? >To: "Stunnel Users Mailing List" <stunnel-users(a)mirt.net>, "larisa_y" <larisaka(a)yahoo.com> >Date: Thursday, January 19, 2012, 8:01 AM > > >Larisa, >I compiled stunnel-4.39 against OpenSSL 0.9.8s. Let me know if you are interested in the binaries. > >Regards >Jose > >________________________________ >From: Michal Trojnara <Michal.Trojnara(a)mirt.net> >To: Stunnel Users Mailing List <stunnel-users(a)mirt.net> >Sent: Tuesday, January 17, 2012 5:08 PM >Subject: Re: [stunnel-users] ver 4.5 VS 4.2: running single process now, how to close when all client apps closed? >larisa_y wrote:> Could you tell me starting which version the new behaviour was implemented?> (single process architecture) I tried the changelog but could not really> identify the item.The implementation of this change started with stunnel 4.40 with new "stunnel -exit" option. The last version fully supporting multiple processes is 4.39.Please be aware of security risks related to using obsolete versions of OpenSSL. Some Win32 GUI features are also unstable until version 4.50.Mike_______________________________________________stunnel-users mailing liststunnel-users@stunnel.orghttp://stunnel.mirt.net/mailman/listinfo/stunnel-users

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Re: [stunnel-users] STARTTLS
by James Devine 20 Jan '12

20 Jan '12

http and smtp are two different birds, https runs on a different port, whereas an smtp connection running on port 25 can be upgraded to secure with starttls On Fri, Jan 20, 2012 at 12:29 AM, Michal Trojnara <Michal.Trojnara(a)mirt.net>wrote: > James Devine <fxmulder(a)gmail.com> wrote: > > >I've setup stunnel to tunnel port 25 to a few backend smtp servers, it > >appears that it only works with starttls, is there a way to make it > >work if > >no starttls is issued also? > >_______________________________________________ > >stunnel-users mailing list > >stunnel-users(a)stunnel.org > >http://stunnel.mirt.net/mailman/listinfo/stunnel-users > > Do you also have problems with https on port 80? > > Mike >

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STARTTLS
by James Devine 19 Jan '12

19 Jan '12

I've setup stunnel to tunnel port 25 to a few backend smtp servers, it appears that it only works with starttls, is there a way to make it work if no starttls is issued also?

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ver 4.5 VS 4.2: running single process now, how to close when all client apps closed?
by larisa_y 19 Jan '12

19 Jan '12

I have several client applications running on win machine, connecting to the same server, or sometimes to different servers. ver. 4.2 allowed me to do the following: modify .conf file to [my_section] accept=5566 connect 123.22.33.44:5005; then run stunnel.exe; modify .conf file to [my_section] accept=5567 connect 456.22.33.44:5006; then run stunnel.exe. That would start 2 stunnel.exe processes, each one handling its own connection; which were easy to close when each respective client app closed - each one would close the one it started. Now with 4.5 version: the single stunnel.exe process runs and is able to handle all communications perfectly, provided I prepare .conf file for all possible connections in advance, before starting stunnel. The problem I cannot solve easily is how not to leave stunnel running after client logged out of all the applications. Without building something to keep track of "stunnels users" count, how could I do it? Is there some way to switch to multiple instances mode? Please advise. Larisa -- View this message in context: http://old.nabble.com/ver-4.5-VS-4.2%3A-running-single-process-now%2C-how-t… Sent from the Stunnel - Users mailing list archive at Nabble.com.

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Windows Live Mail issue ?
by Victor 19 Jan '12

19 Jan '12

I'm new with stunnel and I'm experiencing a issue. Windows Live Mail is closing the connection with the SSL tunnel without send the close down packet, resulting in connection reset by peer. Follow the output debug of stunnel: 2012.01.18 17:13:25 LOG7[16954:34377572800]: Socket closed on read 2012.01.18 17:13:25 LOG7[16954:34377572800]: Sending SSL write shutdown 2012.01.18 17:13:25 LOG7[16954:34377572800]: SSL alert (write): warning: close notify 2012.01.18 17:13:25 LOG6[16954:34377572800]: SSL_shutdown successfully sent close_notify 2012.01.18 17:13:25 LOG3[16954:34377572800]: SSL_read: Connection reset by peer (54) 2012.01.18 17:13:25 LOG5[16954:34377572800]: Connection reset: 293 bytes sent to SSL, 1293 bytes sent to socket 2012.01.18 17:13:25 LOG7[16954:34377572800]: Service stunnel finished (0 left) 2012.01.18 17:13:25 LOG7[16954:34377572800]: str_stats: 28 block(s), 988 byte(s) The e-mail message is sent successfully but Im very intrigued with the line "Connection reset: 293 bytes sent to SSL, 1293 bytes sent to socket", that make me think that some data was lost in the middle of the connection. I need to fix something or this is a normal behavior ? qmail 1.03 with SPAMCONTROL stunnel 4.43 running on FreeBSD 8.0-RELEASE Config file: ; SMTP SSL (SMTP-AUTH) debug = 7 foreground = yes syslog = no cert = /usr/local/etc/stunnel/stunnel.pem exec = /var/qmail/bin/qmail-smtpd execargs = qmail-smtpd /mailhome/bin/vchkpw /bin/true Thanks in advance !

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client side SNI
by yyy 14 Jan '12

14 Jan '12

It looks like server name for client side SNI is defined as name to connect to in connect option. According to RFC, this name must be FQDN. It is the only place where it is defined and server name for SNI cannot be defined outside connect option. Is that right? Server side SNI has some good examples. Searching for "client side SNI" did not yield anything useful. I am trying to run multiple independent services over the same port there is no DNS infrastructure in place, so those server names would be random strings not refering to anything. Both ends would be stunnel. If it is as it seems, it will not work, because defined server name (at client) must be working DNS name (FQDN).

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Verify = 3 and Giganews
by Thomas Eifert 13 Jan '12

13 Jan '12

Hello, I've tried to use verify = 3 with Giganews on several occasions now, but it always fails. It works fine with other servers, however. Here is the debug output for the Giganews scenario: 2012.01.12 14:05:01 LOG4[292:3840]: CERT: Verification error: unable to get local issuer certificate 2012.01.12 14:05:01 LOG4[292:3840]: Certificate check failed: depth=1, /C=US/O=GeoTrust Inc./OU=Domain Validated SSL/CN=GeoTrust DV SSL CA 2012.01.12 14:05:01 LOG3[292:3840]: SSL_connect: 14090086: error:14090086:SSL routines:SSL3_GET_SERVER_CERTIFICATE:certificate verify failed And the following is from my stunnel.conf: ~~~~~~~~~~~~~~~~~~~~~~~~~~~ debug = 6 delay = yes [nntps.3] client = yes sslVersion = TLSv1 ciphers = AES256-SHA cafile = peer-nntps.3.pem verify = 3 accept = 127.0.0.1:119 connect = news.giganews.com:443 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ As I have with other connections, I am saving peer-nntps3.pem from the log window menu. Can anyone tell me why this is failing on this server only? Regards; Thomas

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stunnel 4.52 released
by Michal Trojnara 12 Jan '12

12 Jan '12

Dear Users, I have released version 4.52 of stunnel. This is a bugfix release. Upgrade is highly recommended. The ChangeLog entry: Version 4.52, 2012.01.12, urgency: MEDIUM: * Bugfixes - Fixed write closure notification for non-socket file descriptors. - Removed a line logged to stderr in inetd mode. - Fixed "Socket operation on non-socket" error in inetd mode on Mac OS X platform. - Removed direct access to the fields of the X509_STORE_CTX data structure. Home page: http://www.stunnel.org/ Download: ftp://ftp.stunnel.org/stunnel/ SHA-256 hash for stunnel-4.52.tar.gz: 7c78c178074e9b96331518a9c309d2e95ca9ad6e0338a96d5ab8ad47fde4347c Best regards, Mike

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