March 2018 - stunnel-users

stunnel FIPS mode 140-2/ Other Modes
by mehmet ozisik 19 Sep '25

19 Sep '25

Hi All, I would like to ask a question about stunnel fips mode. There are lots of question and answers on the internet related with this, but I could not find any answer related with mine. I am compiling with openssl (auto detecting fips) . Here is a part of confgiure output : checking for FIPS_mode_set... yes configure: FIPS mode detected So I am thinking that fips also is being included. Then I try to run stunnel on target platform (in stunnel.conf fips=yes) and it gives below error : Compiled/running with OpenSSL 0.9.8w-fips 23 Apr 2012 Threading:PTHREAD Sockets:POLL,IPv6 SSL:ENGINE,OCSP,FIPS Reading configuration from file stunnel.conf FIPS_mode_set: 2D06906E: error:2D06906E:FIPS routines:FIPS_CHECK_INCORE_FINGERPRINT:fingerprint does not match there are lots of information about this errror on internet. Then when I configure stunnel.conf with fips=no, stunnel is running successfully. I know that fips=yes means that enables FIPS 140-2 mode and I guess my fips canister does not supoort fips 140-2 mode (I do not know which fips mode it has supported). Now my question is coming : When I set fips=no, stunnel also starts with other available fips modes which the canister included? Or it skips running fips mode completely? Plase inform me if anyone has any idea? Regards

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Requests to cloud server that requires host header
by Lorne Kates 13 Nov '24

13 Nov '24

(related to Akamai message from before-- but I have better troubleshooting information). I'm tying to route traffic through stunnel to a "cloud" based-endpoint. That endpoint has a static server name-- test.authorize.net. (This is the dev sandbox for auth.net) But if you do an nslookup on test.authorize.net, you'll get back a different servername and IP, because it's so wonderfully "cloud". Stunnel apparently tries to connect to the nslookup value. The server rejects the request because it can't route it back to test.authorize.net. I've tried adding "delay = yes" and "sni = test.authorize.net", but neither work. To see this in action, a simple setup with any accept, then connect to test.authorize.net:443 in client = yes mode. This is what a valid response looks like (13 -- give me the darn merchant ID in a POST): https://test.authorize.net/gateway/transact.dll This is what you'll get if you try to use stunnel (400 invalid url) : https://23.195.204.150/gateway/transact.dll So how can I get stunnel to send the proper Request Header (host: test.authorize.net) make sure it's using http/1.1, etc?

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Stunnel 4 failing to connect to gmail
by Asif Iqbal 11 Dec '20

11 Dec '20

I am faling to connect to gmail. Not sure what that bind error means. iqbala@ghar:~$ sudo stunnel4 2008.12.15 13:53:17 LOG7[3839:3083650736]: Snagged 64 random bytes from /home/iqbala/.rnd 2008.12.15 13:53:17 LOG7[3839:3083650736]: Wrote 1024 new random bytes to /home/iqbala/.rnd 2008.12.15 13:53:17 LOG7[3839:3083650736]: RAND_status claims sufficient entropy for the PRNG 2008.12.15 13:53:17 LOG7[3839:3083650736]: PRNG seeded successfully 2008.12.15 13:53:17 LOG7[3839:3083650736]: Certificate: /etc/stunnel/stunnel.pem 2008.12.15 13:53:17 LOG7[3839:3083650736]: Certificate loaded 2008.12.15 13:53:17 LOG7[3839:3083650736]: Key file: /etc/stunnel/stunnel.pem 2008.12.15 13:53:17 LOG7[3839:3083650736]: Private key loaded 2008.12.15 13:53:17 LOG7[3839:3083650736]: SSL context initialized for service ssmtp 2008.12.15 13:53:17 LOG5[3839:3083650736]: stunnel 4.22 on i486-pc-linux-gnu with OpenSSL 0.9.8g 19 Oct 2007 2008.12.15 13:53:17 LOG5[3839:3083650736]: Threading:PTHREAD SSL:ENGINE Sockets:POLL,IPv6 Auth:LIBWRAP 2008.12.15 13:53:17 LOG6[3839:3083650736]: file ulimit = 1024 (can be changed with 'ulimit -n') 2008.12.15 13:53:17 LOG6[3839:3083650736]: poll() used - no FD_SETSIZE limit for file descriptors 2008.12.15 13:53:17 LOG5[3839:3083650736]: 500 clients allowed 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 10 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 11 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: FD 12 in non-blocking mode 2008.12.15 13:53:17 LOG7[3839:3083650736]: SO_REUSEADDR option set on accept socket 2008.12.15 13:53:17 LOG3[3839:3083650736]: Error binding ssmtp to 74.125.93.111:587 2008.12.15 13:53:17 LOG3[3839:3083650736]: bind: Cannot assign requested address (99) Here is how my conf file looks like iqbala@ghar:~$ cat /etc/stunnel/stunnel.conf | egrep -v "^;|^$" cert = /etc/stunnel/stunnel.pem foreground = yes sslVersion = SSLv3 chroot = /var/lib/stunnel4/ setuid = stunnel4 setgid = stunnel4 pid = /stunnel4.pid socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 debug = 7 output = /var/log/stunnel4/stunnel.log client = yes [ssmtp] accept = smtp.gmail.com:587 connect = 25 Asif Iqbal PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu

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Stunnel & Gmail security
by BOXI31 TEST 16 Oct '20

16 Oct '20

Hi all, To make "Stunnel 5.31" work with Gmail, I have to go in security settings of Gmail and "allow less secure apps to access my account". Is it mandatory ? Is it possible to set Stunnel to access Gmail without lowering it security level ? How ? I checked in log file TLS v1.2 is used by Stunnel but Gmail still consider it as a "less secure app." ! Regards, Steve

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First Time Troubles.
by me＠kilosierracharlie.me 22 Mar '18

22 Mar '18

Hello All, I'm trying to configure STunnel4 on Windows to connect to my VPS installed with STunnel, so I can use SSH through a DPI laden network. The configuration works if I try at home, or on a mobile data hotspot, but if I attempt within the DPI network, it does not work, and provides this console output: 2018.03.22 09:30:15 LOG5[main]: stunnel 5.44 on x86-pc-msvc-1500 platform 2018.03.22 09:30:15 LOG5[main]: Compiled/running with OpenSSL 1.0.2m-fips 2 Nov 2017 2018.03.22 09:30:15 LOG5[main]: Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2018.03.22 09:30:15 LOG5[main]: Reading configuration from file stunnel.conf 2018.03.22 09:30:15 LOG5[main]: UTF-8 byte order mark detected 2018.03.22 09:30:15 LOG5[main]: FIPS mode disabled 2018.03.22 09:30:15 LOG5[main]: Configuration successful 2018.03.22 09:30:24 LOG5[0]: Service [ssh] accepted connection from 127.0.0.1:65086 2018.03.22 09:30:24 LOG5[0]: s_connect: connected 130.185.251.28:443 2018.03.22 09:30:24 LOG5[0]: Service [ssh] connected remote server from 172.28.1.25:65087 2018.03.22 09:30:25 LOG4[0]: CERT: Certificate not found in local repository 2018.03.22 09:30:25 LOG4[0]: Rejected by CERT at depth=0: CN=130.185.251.28 2018.03.22 09:30:25 LOG3[0]: SSL_connect: 14090086: error:14090086:SSL routines:ssl3_get_server_certificate:certificate verify failed 2018.03.22 09:30:25 LOG5[0]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket This is the configuration I'm using: [ssh] client = yes accept = 443 connect = 130.185.251.28:443 CAfile = peer-ssh.pem verifyPeer = yes The odd thing, is that if I connect using my mobile data, and then switch over to filtered internet and try again, it works fine, and adds the following lines to the log: 2018.03.22 09:36:46 LOG5[1]: Service [ssh] accepted connection from 127.0.0.1:65237 2018.03.22 09:36:46 LOG5[1]: s_connect: connected 130.185.251.28:443 2018.03.22 09:36:46 LOG5[1]: Service [ssh] connected remote server from 192.168.43.115:65238 2018.03.22 09:36:46 LOG5[1]: Certificate accepted at depth=0: C=GB, ST=Lincolnshire, L=Horncastle, O=N/A, OU=N/A, CN=personal.kilosierracharlie.me, emailAddress=webmaster(a)kilosierracharlie.me Has anyone got any ideas regarding this issue? It's not mission critical, but it's quite annoyingly repetitive! Cheers, Kieran.

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sTunnel client connecting to load balanced URL - stunnel 5.02 on x86-pc-msvc-1500 platform
by Tony 19 Mar '18

19 Mar '18

Hi all, I have a situation where I'm trying to use sTunnel as the client to connect to a service on a secure URL, but the hiccup is that the secure URL is load balanced. If a do an nslookup on the URL, the response comes back as it being an alias. Non-authoritative answer: Name: eu1571393051174.ssl.ondemand.com Address: 155.56.210.164 Aliases: l4884-iflmap.hcisbp.eu1.hana.ondemand.com Looking at the sTunnel log, it resolves to the IP of the server. But the IP itself does not host the service so I'm getting http:503 errors. 2018.03.16 14:44:44 LOG7[18796]: Service [ssl-OSRdev] (FD=564) bound to 0.0.0.0:8085 2018.03.16 14:44:55 LOG7[18796]: Service [ssl-OSRdev] accepted (FD=572) from 192.168.0.22:61093 2018.03.16 14:44:55 LOG7[18796]: Creating a new thread 2018.03.16 14:44:55 LOG7[18796]: New thread created 2018.03.16 14:44:55 LOG7[30864]: Service [ssl-OSRdev] started 2018.03.16 14:44:55 LOG5[30864]: Service [ssl-OSRdev] accepted connection from 192.168.0.22:61093 2018.03.16 14:44:55 LOG6[30864]: s_connect: connecting 155.56.210.164:443 2018.03.16 14:44:55 LOG7[30864]: s_connect: s_poll_wait 155.56.210.164:443: waiting 10 seconds 2018.03.16 14:44:56 LOG5[30864]: s_connect: connected 155.56.210.164:443 2018.03.16 14:44:56 LOG5[30864]: Service [ssl-OSRdev] connected remote server from 192.168.0.32:30269 2018.03.16 14:44:56 LOG7[30864]: Remote socket (FD=588) initialized 2018.03.16 14:44:56 LOG7[30864]: SNI: sending servername: l4884-iflmap.hcisbp.eu1.hana.ondemand.com 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): before/connect initialization 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv2/v3 write client hello A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 read server hello A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 read server certificate A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 read server key exchange A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 read server certificate request A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 read server done A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 write client certificate A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 write client key exchange A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 write certificate verify A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 write change cipher spec A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 write finished A 2018.03.16 14:44:56 LOG7[30864]: SSL state (connect): SSLv3 flush data 2018.03.16 14:44:57 LOG7[30864]: SSL state (connect): SSLv3 read finished A 2018.03.16 14:44:57 LOG7[30864]: 1 items in the session cache 2018.03.16 14:44:57 LOG7[30864]: 1 client connects (SSL_connect()) 2018.03.16 14:44:57 LOG7[30864]: 1 client connects that finished 2018.03.16 14:44:57 LOG7[30864]: 0 client renegotiations requested 2018.03.16 14:44:57 LOG7[30864]: 0 server connects (SSL_accept()) 2018.03.16 14:44:57 LOG7[30864]: 0 server connects that finished 2018.03.16 14:44:57 LOG7[30864]: 0 server renegotiations requested 2018.03.16 14:44:57 LOG7[30864]: 0 session cache hits 2018.03.16 14:44:57 LOG7[30864]: 0 external session cache hits 2018.03.16 14:44:57 LOG7[30864]: 0 session cache misses 2018.03.16 14:44:57 LOG7[30864]: 0 session cache timeouts 2018.03.16 14:44:57 LOG7[30864]: Peer certificate was cached (3826 bytes) 2018.03.16 14:44:57 LOG6[30864]: SSL connected: new session negotiated 2018.03.16 14:44:57 LOG6[30864]: Negotiated TLSv1/SSLv3 ciphersuite: ECDHE-RSA-AES128-GCM-SHA256 (128-bit encryption) 2018.03.16 14:44:57 LOG6[30864]: Compression: null, expansion: null 2018.03.16 14:44:58 LOG6[30864]: SSL socket closed (SSL_read) 2018.03.16 14:44:58 LOG7[30864]: Sent socket write shutdown 2018.03.16 14:44:58 LOG5[30864]: Connection closed: 1730 byte(s) sent to SSL, 274 byte(s) sent to socket 2018.03.16 14:44:58 LOG7[30864]: Remote socket (FD=588) closed 2018.03.16 14:44:58 LOG7[30864]: Local socket (FD=572) closed 2018.03.16 14:44:58 LOG7[30864]: Service [ssl-OSRdev] finished (0 left) 2018.03.16 14:44:58 LOG7[30864]: str_stats: 3 block(s), 4294962489 data byte(s), 150 control byte(s) 2018.03.16 14:44:58 LOG7[30864]: str_stats: 20 byte(s) at ..\src\network.c:413 2018.03.16 14:44:58 LOG7[30864]: str_stats: 20 byte(s) at ..\src\network.c:412 2018.03.16 14:44:58 LOG7[30864]: str_stats: 20 byte(s) at ..\src\network.c:411 I have tested the service using SoapUI and it works. Is it possible to have sTunnel follow the URL redirection? Regards, Tony

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Re: [stunnel-users] basic usage question
by Mark Foley 19 Mar '18

19 Mar '18

Solved! I've fixed up the various ports and now I am able to connect. For the edification of other list readers I'll summarize. I have a local Linux host acting as firewall/router. It routes requests on port 1234 to port 3389 on a local Linux workstation which is running x11vnc server listening on its local port 5900. I want to connect to this VNC server from a remote vnc viewer. (Why does the router forward to port 3389? Because the workstaion can dual-boot Windows, so the forward works regardless of booted OS.) Remote vnc viewer, stunnel client stunnel.conf: verify = 2 pid = /home/mfoley/.stunnel/stunnel.pid CAfile = /home/mfoley/.stunnel/certificate.pem client = yes [x11vnc] accept = 5900 connect = router.obfuscate.org:1234 Local workstation vnc server, stunnel server stunnel.conf: pid = /var/run/stunnel.pid debug = 7 [x11vnc] accept = 3389 key = /root/privatekey.pem cert = /root/certificate.pem connect = 127.0.0.1:5900 The certificate is self-signed and created on the stunnel/vnc server host using the following commands: openssl genrsa -out privatekey.pem 2048 openssl req -new -x509 -days 365 -key privatekey.pem -out certificate.pem The certificate.pem is copied to the stunnel client host. With x11vnc listening on 5900 on the local workstation and with 'stunnel stunnel.conf' running on both stunnel client (as the normal user) and server hosts, I use the remote vnc viewer, logged in as a normal user, with the connection 127.0.0.1:5900 I'm guessing I could configure my vnc viewers to connect to multiple clients with difference [service] sections, for example: verify = 2 pid = /home/mfoley/.stunnel/stunnel.pid CAfile = /home/mfoley/.stunnel/certificate.pem client = yes [remoteHost1] accept = 5900 connect = router.obfuscate.org:1234 [remoteHost2] accept = 5901 connect = router.obfuscate.org:4321 I haven't tried that, but I will. I futher guess that I could have different CAfiles per server if I moved that directive to the respective service defintions (can someone confirm?), but I haven't tried that either. Thanks especially to Flo Rance for helping me work through this. Now, I have to figure out how to do this from a Windows client! --Mark

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Creating CSR for GoDaddy
by John McClymont 15 Mar '18

15 Mar '18

Good Morning, As a novice user of stunnel. I use stunnel to make and encrypted video connection to home security system. I wish to create an SSL certificate request to obtain an SSL from GoDaddy I use the following command openssl req -new -newkey rsa:2048 -nodes -keyout c:\key\private_key.key -out c:\key\request.csr Is this correct? thanks in advance for suggestions

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Re: [stunnel-users] basic usage question
by Mark Foley 15 Mar '18

15 Mar '18

Nitin - sorry, I didn't realize this was a response to my message and I sent a followup message before reading this one. I have your patch in a previous message. I'm not familiar with "patching". Can you give me quickie instructions on doing that, or refer me to a link that explains it? I assume I need to patch the source code, right? If so, I have stunnel version 5.35. Do I need to apply this patch to a more recent version? Are there any other sslVersions stunnel supports? Thanks --Mark -----Original Message----- On Tue, 13 Mar 2018 22:21:24 +0400 Nitin Mutkawoa <jmutkawoa(a)hackers.mu> wrote: > > hello > > Sorry, I was not clear enough in my previous mail. > The patch allows you to specify TLS 1.3 in the configuration file and do a > TLS 1.3 only. > > regards > > Nitin J Mutkawoa > > https://tunnelix.com > https://hackers.mu > > Twitter: @TheTunnelix > > On Tue, Mar 13, 2018 at 3:13 PM, Ma??gorzata Olszówka < > Malgorzata.Olszowka(a)stunnel.org> wrote: > > > I'm also working on TLS 1.3 compatibility with Stunnel. I will reach the > >> mailing list as soon as possible with a tested patch. > >> > > > > Hello Nitin, > > Could you specify what problem do you have with TLS 1.3. > > It works for me: > > > > 2018.03.13 11:39:06 LOG5[ui]: stunnel 5.44 on x86_64-unknown-linux-gnu > > platform > > 2018.03.13 11:39:06 LOG5[ui]: Compiled/running with OpenSSL > > 1.1.1-pre2-dev xx XXX xxxx > > ??? > > 2018.03.13 11:39:23 LOG6[0]: Negotiated TLSv1.3 ciphersuite > > TLS13-AES-256-GCM-SHA384 (256-bit encryption) > > > > > > Regards, > > Ma??gorzata > > _______________________________________________ > > stunnel-users mailing list > > stunnel-users(a)stunnel.org > > https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users > >

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Re: [stunnel-users] basic usage question
by Mark Foley 14 Mar '18

14 Mar '18

Thanks to help from Nitin, I've made a tiny bit of progress with stunnel. I've created the certificates per Nitin's instructions at https://tunnelix.com/securing-mysql-traffic-with-stunnel-in-a-jail-environm… Certificates have permissions 0600. I want to use a VNC client on Linux to connect to a VNC Server also on Linux. In between these two computers I have a Linux router which routes all request to port 1914 to port 3389 on the VNC Server. stunnel on the server is run at the command line by root: 'stunnel /root/stunnel.conf'. Here is my VNC Server computer's stunnel.conf: foreground = yes pid = /var/run/stunnel.pid debug = 7 ; output = /root/stunnel.log output = /dev/stdout [x11vnc] accept = 3389 key = /root/privatekey.pem cert = /root/certificate.pem connect = 127.0.0.1:5900 stunnel on the client is run by a normal user, stunnel $HOME/.stunnel/stunnel.conf. Below is my client stunnel.conf: foreground = yes verify = 2 pid = /home/mfoley/.stunnel/stunnel.pid CAfile = /home/mfoley/.stunnel/certificate.pem client = yes [x11vnc] accept = 5900 connect = mail.ohprs.org:1914 When I run stunnel on the client I get: 2018.03.13 13:21:17 LOG5[ui]: stunnel 5.35 on x86_64-slackware-linux-gnu platform 2018.03.13 13:21:17 LOG5[ui]: Compiled with OpenSSL 1.0.2h 3 May 2016 2018.03.13 13:21:17 LOG5[ui]: Running with OpenSSL 1.0.2n 7 Dec 2017 2018.03.13 13:21:17 LOG5[ui]: Update OpenSSL shared libraries or rebuild stunnel 2018.03.13 13:21:17 LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI Auth:LIBWRAP 2018.03.13 13:21:17 LOG5[ui]: Reading configuration from file /home/mfoley/.stunnel/stunnel.conf 2018.03.13 13:21:17 LOG5[ui]: UTF-8 byte order mark not detected 2018.03.13 13:21:17 LOG5[ui]: FIPS mode disabled 2018.03.13 13:21:17 LOG4[ui]: Service [x11vnc] uses "verify = 2" without subject checks 2018.03.13 13:21:17 LOG4[ui]: Use "checkHost" or "checkIP" to restrict trusted certificates 2018.03.13 13:21:17 LOG5[ui]: Configuration successful On the client, I then run tigerVNCViewer connecting to 127.0.0.1::5900. I get the following messages on the client: 2018.03.13 13:22:03 LOG5[0]: Service [x11vnc] accepted connection from 127.0.0.1:35034 2018.03.13 13:22:03 LOG5[0]: s_connect: connected 98.102.63.107:1914 2018.03.13 13:22:03 LOG5[0]: Service [x11vnc] connected remote server from 192.168.0.17:40512 2018.03.13 13:22:03 LOG3[0]: SSL_connect: 140770FC: error:140770FC:SSL routines:SSL23_GET_SERVER_HELLO:unknown protocol 2018.03.13 13:22:03 LOG5[0]: Connection reset: 0 byte(s) sent to SSL, 0 byte(s) sent to socket Just guessing, but is it failing with the SSLVersion? Help appreciated. Thanks, Mark

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