September 2023 - 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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Re: [stunnel-users] CPU 100%
by Eric Eberhard 06 Nov '24

06 Nov '24

Long ago I had a server with a bad network card. Every once in a while it would spew uncontrollable bytes onto the network. If you open a stunnel connection and it does that this could very well be the problem. If it cheap, try changing the network card. If not, you should be able to look in your firewall/router and it will tell you who is sending what bytes to whomever. See if that machine is indeed streaming the bytes in massive quantities. If not, I would suspect your stunnel is getting stuck in it's own loop. There are a million reasons this can happen (well a few less than a million) - such as maybe a bad library in the FreeBSD or a bad choice in the Makefile - such as doing threads or something in a way your O/S does not like (I use threads=fork or whatever it is, instead of actual threading). You might tinker with some of the options that make the stunnel build and try different ones. Especially if stunnel was compiled on a different version of the O/S - could be differences in bytes in things and who knows what. That is all I can suggest beyond setting the debug level to 7 (I think is highest) and then watching the log file. Eric From: stunnel-users [mailto:stunnel-users-bounces@stunnel.org] On Behalf Of Murrey, Brian J. Sent: Wednesday, October 17, 2018 10:57 AM To: stunnel-users(a)stunnel.org Subject: [stunnel-users] CPU 100% We are running stunnel 5.49 on FreeBSD 11.2 and we're running into a problem once in a while. CPU pegs at 100% when we get an stunnel connection from one of our external devices. This affects 100% of all cores and we can't even log in to console. To mitigate this temporarily, we have a script running in the background to watch when stunnel begins to spike and restarts the daemon. It doesn't happen 100% of the time, and so far I have been unable to distinguish what makes the connection do this to the CPU. Have any of you run in to this issue? Sincerely, Brian Murrey System Engineer II, IT Infrastructure _____ NOTICE: This message may contain privileged and confidential information and/or protected health information intended solely for the use of the named recipient and may be privileged or otherwise protected by law. If you are not the intended recipient of this message, you should immediately notify the sender and delete this message. Do not disseminate, reproduce, or review this message or attachments if you are not the intended recipient. The sender or others may have legal rights restricting the dissemination of the information contained in this message and, as a result, remedies against you in the event of the improper dissemination of confidential information, trade secrets, personal information or privileged communications. This message is the work of the sender and does not necessarily reflect the position, views, or policies of TriMedx LLC or its affiliates. WARNING: The integrity and security of this message cannot be guaranteed and may contain or transmit a virus or other illicit code. Neither TriMedx LLC or its affiliates accept liability for any damage attributable to viruses or illicit code transmitted through this message or an attachment.

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older browsers, stunnel and privoxy
by kovacs janos 04 Mar '24

04 Mar '24

sorry to bother, im trying to make older browsers be able to display TLS 1.1 and TLS 1.2 sites. i heard stunnel cant be configured to always forward to the current site address dynamically, thats why i would use privoxy. the browser is configured to send to: 127.0.0.1 443 stunnel config has this at the end: [Tunnel_in] client = yes accept = 127.0.0.1:443 connect = 127.0.0.1:8118 verifyChain = yes CAfile = ca-certs.pem checkHost = localhost 127.0.0.1:8118 is the privoxy address. this is what stunnel writes: LOG5[main]: Configuration successful LOG5[0]: Service [Tunnel_in] accepted connection from 127.0.0.1:3261 LOG5[0]: s_connect: connected 127.0.0.1:8118 LOG5[0]: Service [Tunnel_in] connected remote server from 127.0.0.1:3262 and the browser infinitely loads, and never loads anything or leaves the page. if i remove the last 3 lines, its the same just with this line added: LOG4[main]: Service [Tunnel_in] needs authentication to prevent MITM attacks but it doesnt give an error or anything. with a configuration like: [Tunnel_out] client = no accept = 127.0.0.1:443 connect = 127.0.0.1:8118 cert = stunnel.pem this is what it gives: LOG5[3]: Service [Tunnel_out] accepted connection from 127.0.0.1:3294 LOG3[3]: SSL_accept: 1407609B: error:1407609B:SSL routines:SSL23_GET_CLIENT_HELLO:https proxy request LOG5[3]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket and browser gives a server not found error immediately. im not even sure if i should use client or server configuration in a case like this, but none of them works anyway. all i would need is for my browser to get the pages decrypted, or at least in less than TLS1.1. like how on newipnow.com i can access sites with any encryption, since they are sent to the browser without encryption. the browser just gives an "unencrypted tunnel" warning, which is how i found stunnel, and which is exactly what i need, just locally.

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TPM based mutual tls authentication
by Nyiri, Gabor (Nokia - HU/Budapest) 07 Nov '23

07 Nov '23

Hi, Can you help me how to configure stunnel client to use TPM for mutual TLS authentication? I want to connect with mTLS to a remote server then make this connection available for localhost without mTLS. Thanks for your help in advance! Here is my configuration so far without TPM: debug = debug output = /tmp/stunnel.log foreground = yes [mtls_client] client = yes accept = 127.0.0.1:12019 sni = server-with-mtls.example.com checkHost = server-with-mtls.example.com connect = 1.2.3.4:443 verifyChain = yes CApath = /etc/ssl/certs/ cert = client.crt key = client.key Thanks & br, Gábor Nyíri,

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stunnel events
by noel_melvin＠neimanmarcus.com 02 Oct '23

02 Oct '23

Whats the difference between Connection closed: : 2505 byte(s) sent to TLS, 59 byte(s) sent to socket and Connection closed: : 0 byte(s) sent to TLS, 0 byte(s) sent to socket we can see these kind of variations in the stunnel logs. if its 0 bytes doest it mean that client didnt send any data/packet to stunnel server? Need help

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Java jdk.disabled.NamedCurves
by Randy Curry 27 Sep '23

27 Sep '23

Hello, We are making a Rest API to an endpoint that uses stunnel for their proxy. We recently upgraded our integration engine and it's running Java AdoptOpenJDK 11.0.15. Since we've upgraded we can only successfully make one or two POST API calls then we get an error: Caused by: java.io.IOException: Error writing to server I did some research and found this version of Java has disabled named curves, part of it's Elliptic-curve cryptography. Is there any known issues with stunnel and the version of Java that's being used or the disabled named curves? Thank you, Randy Curry Senior Integration Services Architect [cid:image005.jpg@01D6602C.0A82CC60] [cid:image002.png@01D6602B.17ACD030]randy.curry@mihin.org<mailto:randy.curry@mihin.org> [cid:image003.png@01D6602B.17ACD030] 919.588.1036 [cid:image004.png@01D6602B.17ACD030] www.mihin.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mihin.org&d=DwQGaQ&…> [cid:image006.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__twitter.com_MiHIN&d=Dw…>[cid:image007.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.youtube.com_user_M…>[cid:image008.png@01D6602C.0A82CC60]<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.linkedin.com_compa…> Confidentiality Notice: This e-mail message, including any attachments, is for the sole use of the intended recipient(s) and may contain confidential and privileged information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by returning the e-mail and destroying all copies of the original message.

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stunnel 5.71 released
by Michał Trojnara 19 Sep '23

19 Sep '23

Dear Users, I have released version 5.71 of stunnel. ### Version 5.71, 2023.09.19, urgency: MEDIUM * Security bugfixes - OpenSSL DLLs updated to version 3.1.3. * Bugfixes - Fixed the console output of tstunnel.exe. * Features sponsored by SAE IT-systems - OCSP stapling is requested and verified in the client mode. - Using "verifyChain" automatically enables OCSP stapling in the client mode. - OCSP stapling is always available in the server mode. - An inconclusive OCSP verification breaks TLS negotiation. This can be disabled with "OCSPrequire = no". - Added the "TIMEOUTocsp" option to control the maximum time allowed for connecting an OCSP responder. * Features - Added support for Red Hat OpenSSL 3.x patches. Home page: https://www.stunnel.org/ Download: https://www.stunnel.org/downloads.html SHA-256 hashes: f023aae837c2d32deb920831a5ee1081e11c78a5d57340f8e6f0829f031017f5 stunnel-5.71.tar.gz 945df5118473bcbf1ecdc5561fd6f26743c5dd1fd82e1a25199d0fd5c39a9373 stunnel-5.71-win64-installer.exe d511df533bb89464a324b2439e7e04b24b6ce26ecc0e03b67ada307725343d40 stunnel-5.71-android.zip Best regards, Mike

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New machine
by stunnel＠paapnet.nl 16 Sep '23

16 Sep '23

Hello All, Who can help me? Just setup a new Ubuntu 22.04 (server) machine gcc version 11.4.0 (Ubuntu 11.4.0-1ubuntu1~22.04) grabbed stunnel (git) However running into issues (an old linux box runs well with compile) configure runs well: config.status: creating doc/Makefile config.status: creating tools/Makefile config.status: creating tests/Makefile config.status: creating tests/certs/Makefile config.status: creating src/config.h config.status: executing depfiles commands config.status: executing libtool commands configure: **************************************** success Make bails out: root@dns:/Downloads/stunnel# make CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash '/Downloads/stunnel/auto/missing' aclocal-1.16 -I m4 cd . && /bin/bash /Downloads/stunnel/auto/missing automake-1.16 --foreign CDPATH="${ZSH_VERSION+.}:" && cd . && /bin/bash '/Downloads/stunnel/auto/missing' autoconf configure.ac:53: warning: back quotes and double quotes must not be escaped in: Unknown thread model \"${withval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1553: AC_ARG_WITH is expanded from... configure.ac:53: the top level configure.ac:285: warning: back quotes and double quotes must not be escaped in: bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:285: the top level configure.ac:309: warning: back quotes and double quotes must not be escaped in: bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:309: the top level configure.ac:334: warning: back quotes and double quotes must not be escaped in: Bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:334: the top level configure.ac:369: warning: back quotes and double quotes must not be escaped in: Bad value \"${enableval}\" lib/m4sugar/m4sh.m4:699: AS_IF is expanded from... ./lib/autoconf/general.m4:1534: AC_ARG_ENABLE is expanded from... configure.ac:369: the top level configure.ac:4: error: possibly undefined macro: AC_MSG_NOTICE If this token and others are legitimate, please use m4_pattern_allow. See the Autoconf documentation. configure.ac:22: error: possibly undefined macro: AC_DEFINE make: *** [Makefile:409: configure] Error 1 aclocal (GNU automake) 1.16.5 autoconf (GNU Autoconf) 2.71 Is active What do I mis here ? Chrs....

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Use of dante socks proxy with Stunnel
by vinesh＠techvinesh.com 15 Sep '23

15 Sep '23

I am deploying connection between on premise database with BI application on cloud. Currently the on premise database connecting via jdbc driver and it not supporting encryption. As per my understanding Stunnel opens port listening on http:127.0.0.1 ( as local) and forward traffic to destination over https using TLSv1.2. I have few question on this , to protect on network level, 1- can I use dante socks proxy along with Stunnel to provide 2 layer of protection? On-prem --- cloud ( 2 layer of protection) -- dante socks ( unencrypted tunnel) -- Stunnel ( e2e Encryption) 2- will it supporting CA other than openSsl

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