March 2024 - stunnel-users

stunnel - client conexion close by TLS alert (write) fatal decode error
by Rodigo Alvarez 07 Mar '25

07 Mar '25

Hi All! I would appreciate any clue to solve the problem we are having with a client mode service that stopped working this week (we verified that the service works directly without stunnel). The error I identify in the trace is the following: "TLS alert (write): fatal: decode error" Stunnel Config (windows version): [afip-prod-fce] client = yes accept = ARSASSRV4DMS06:1031 connect = serviciosjava.afip.gob.ar:443 debug = 7 ws: https://serviciosjava.afip.gob.ar/wsfecred/FECredService Complete trace: 2024.01.24 09:28:46 LOG5[main]: stunnel 5.71 on x64-pc-mingw32-gnu platform 2024.01.24 09:28:46 LOG5[main]: Compiled/running with OpenSSL 3.1.3 19 Sep 2023 2024.01.24 09:28:46 LOG5[main]: Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,OCSP,PSK,SNI 2024.01.24 09:28:46 LOG5[main]: Reading configuration from file C:\Program Files (x86)\stunnel\config\stunnel.conf 2024.01.24 09:28:46 LOG5[main]: UTF-8 byte order mark detected 2024.01.24 09:28:46 LOG5[main]: FIPS mode disabled 2024.01.24 09:28:46 LOG4[main]: Service [afip-prod-fce] needs authentication to prevent MITM attacks 2024.01.24 09:28:46 LOG5[main]: Configuration successful 2024.01.24 09:29:23 LOG7[0]: Service [afip-prod-fce] started 2024.01.24 09:29:23 LOG7[0]: Setting local socket options (FD=892) 2024.01.24 09:29:23 LOG7[0]: Option TCP_NODELAY set on local socket 2024.01.24 09:29:23 LOG5[0]: Service [afip-prod-fce] accepted connection from 10.70.162.24:57723 2024.01.24 09:29:23 LOG6[0]: s_connect: connecting 200.1.116.19:443 2024.01.24 09:29:23 LOG7[0]: s_connect: s_poll_wait 200.1.116.19:443: waiting 10 seconds 2024.01.24 09:29:23 LOG7[0]: FD=896 ifds=rwx ofds=--- 2024.01.24 09:29:24 LOG5[0]: s_connect: connected 200.1.116.19:443 2024.01.24 09:29:24 LOG5[0]: Service [afip-prod-fce] connected remote server from 10.72.0.69:64788 2024.01.24 09:29:24 LOG7[0]: Setting remote socket options (FD=896) 2024.01.24 09:29:24 LOG7[0]: Option TCP_NODELAY set on remote socket 2024.01.24 09:29:24 LOG7[0]: Remote descriptor (FD=896) initialized 2024.01.24 09:29:24 LOG6[0]: SNI: sending servername: serviciosjava.afip.gob.ar 2024.01.24 09:29:24 LOG6[0]: Peer certificate not required 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): before SSL initialization 2024.01.24 09:29:24 LOG7[0]: Initializing application specific data for session authenticated 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write client hello 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write client hello 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read server hello 2024.01.24 09:29:24 LOG6[0]: CERT: Certificate verification disabled 2024.01.24 09:29:24 LOG6[0]: CERT: Certificate verification disabled 2024.01.24 09:29:24 LOG6[0]: CERT: Certificate verification disabled 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read server certificate 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read server key exchange 2024.01.24 09:29:24 LOG7[0]: OCSP stapling: Client callback called 2024.01.24 09:29:24 LOG6[0]: OCSP: Certificate chain verification disabled 2024.01.24 09:29:24 LOG6[0]: Client certificate not requested 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read server done 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write client key exchange 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write change cipher spec 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write finished 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS write finished 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read change cipher spec 2024.01.24 09:29:24 LOG7[0]: TLS state (connect): SSLv3/TLS read finished 2024.01.24 09:29:24 LOG7[0]: New session callback 2024.01.24 09:29:24 LOG7[0]: Peer certificate was cached (6643 bytes) 2024.01.24 09:29:24 LOG6[0]: Session id: D63C79766AC02C9A3E8494AD528954A183E9F7C250856695BA05C16A2219A4B3 2024.01.24 09:29:24 LOG7[0]: 1 client connect(s) requested 2024.01.24 09:29:24 LOG7[0]: 1 client connect(s) succeeded 2024.01.24 09:29:24 LOG7[0]: 0 client renegotiation(s) requested 2024.01.24 09:29:24 LOG7[0]: 0 session reuse(s) 2024.01.24 09:29:24 LOG6[0]: TLS connected: new session negotiated 2024.01.24 09:29:24 LOG6[0]: TLSv1.2 ciphersuite: ECDHE-RSA-AES128-GCM-SHA256 (128-bit encryption) 2024.01.24 09:29:24 LOG6[0]: Peer temporary key: ECDH, P-256, 256 bits 2024.01.24 09:29:24 LOG7[0]: Compression: null, expansion: null 2024.01.24 09:29:24 LOG7[0]: Remove session callback 2024.01.24 09:29:24 LOG7[0]: TLS alert (write): fatal: decode error 2024.01.24 09:29:24 LOG6[0]: TLS socket closed (SSL_read) 2024.01.24 09:29:24 LOG7[0]: Sent socket write shutdown 2024.01.24 09:29:24 LOG5[0]: Connection closed: 1755 byte(s) sent to TLS, 634 byte(s) sent to socket 2024.01.24 09:29:24 LOG7[0]: Remote descriptor (FD=896) closed 2024.01.24 09:29:24 LOG7[0]: Local descriptor (FD=892) closed 2024.01.24 09:29:24 LOG7[0]: Service [afip-prod-fce] finished (0 left) Thank you! Kind regards, Rodrigo.

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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 05 Nov '24

05 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:[email protected]] 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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help configuration for socks5 nordvpn requiring authentication
by Alberto P 10 Apr '24

10 Apr '24

Hello, I would like to use stunnel to use a socks5 server requiring user/pass authentication (nordvpn) with different clients that allow for a socks5 proxy but no authentication. Could someone help me with the configuration (linux or windows is good). In detail, I don't know how to provide user/pass to the configuration, and if it is actually feasible. Any help will be very appreciated !

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Stunnel - Silent switch to change the install directory
by Meena Prabhakaran 26 Mar '24

26 Mar '24

Hi Team, We are 3rd party patch provider like PatchMyPC or ManageEngine. We are providing similar services to our customers. For more details, please have a look at Autonomous Patching for Every Third-Party Windows App (adaptiva.com) (https://adaptiva.com/products/autonomous-patch) We are willing to add the latest stable version of Stunnel product to our catalogue. Downloaded https://www.stunnel.org/downloads/stunnel-5.72-win64-installer.exe We are testing this app on Windows 10 64Bit VM. Please help us on below points: 1. Is there any switch/parameter which can be passed along with "stunnel-5.72-win64-installer.exe" for changing the "Install directory" silently? Tried these switches - /D, /DIR, /APPDIR, /INSTALLDIR, /TARGETDIR, /INSTALLLOCATION Thanks & Regards, Meena Prabhakaran Application Packager, Adaptiva M +91 9080759487 meena.prabhakaran(a)adaptiva.com<mailto:[email protected]> www.adaptiva.com<http://www.adaptiva.com/> Data Protection and Privacy: Your privacy is important to us. We are committed to protecting your personal information and handling it responsibly. For more information on how we process and protect your data, please review our Privacy Policy (https://adaptiva.com/privacy) Confidentiality Notice: Information in this email and any attachments is confidential and intended solely for the use of the individual(s) to whom it is addressed. Any views or opinions presented are solely those of the author and do not necessarily represent those of Adaptiva. The recipient should check for the presence of viruses, as Adaptiva accepts no liability for any virus transmitted by this email.

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Received trusted client CA list not found
by allmail 16 Mar '24

16 Mar '24

I see this message in the Stunnel (client) logs during SSL handshake with the server The server requires a client certificate which has been configured in the stunnel configuration. The handshake is working fine but I was wondering what exactly does this line mean. From what I found so far, seems like there is a way for the server to specify which CA's it will accept for the client certificate and it can specify them in the ClientCertificate request that it sends This server doesnt send anything like that, so I am guessing that is the reason for this log line? Can someone please confirm? Btw, I see this line only when using TLSv1.3. When I restrict the client to TLSv1.2, I dont see this line. thanks LOG Peer certificate required TLS state (connect): before SSL initialization Initializing application specific data for session authenticated TLS state (connect): SSLv3/TLS write client hello TLS state (connect): SSLv3/TLS write client hello TLS state (connect): SSLv3/TLS read server hello TLS state (connect): TLSv1.3 read encrypted extensions Received trusted client CA list not found TLS state (connect): SSLv3/TLS read server certificate request

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Windows service won't start. ""The Stunnel TLS wrapper service is marked as an interactive service."
by docfxit＠theoffice.la 12 Mar '24

12 Mar '24

This is my log: [code] stunnel 5.72 on x64-pc-mingw32-gnu platform 2024.03.10 10:19:49 LOG5[main]: Compiled/running with OpenSSL 3.2.1 30 Jan 2024 2024.03.10 10:19:49 LOG5[main]: Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2024.03.10 10:19:49 LOG7[main]: errno: (*_errno()) 2024.03.10 10:19:49 LOG6[main]: Initializing inetd mode configuration 2024.03.10 10:19:49 LOG7[main]: Running on Windows 6.2 Windows 10 2024.03.10 10:19:49 LOG5[main]: Reading configuration from file C:\Programs\stunnel\config\stunnel.conf 2024.03.10 10:19:49 LOG5[main]: UTF-8 byte order mark not detected 2024.03.10 10:19:49 LOG5[main]: FIPS mode disabled 2024.03.10 10:19:49 LOG6[main]: Compression disabled 2024.03.10 10:19:49 LOG7[main]: No PRNG seeding was required 2024.03.10 10:19:49 LOG6[main]: Initializing service [pop3_DocfxitGmail] 2024.03.10 10:19:49 LOG7[main]: Initializing context [pop3_DocfxitGmail] 2024.03.10 10:19:49 LOG6[main]: OpenSSL security level is used: 2 2024.03.10 10:19:49 LOG7[main]: Ciphers: HIGH:!aNULL:!SSLv2:!DH:!kDHEPSK 2024.03.10 10:19:49 LOG7[main]: TLSv1.3 ciphersuites: TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256 2024.03.10 10:19:49 LOG7[main]: TLS options: 0x2100000 (+0x0, -0x0) 2024.03.10 10:19:49 LOG6[main]: Session resumption enabled 2024.03.10 10:19:49 LOG7[main]: No certificate or private key specified 2024.03.10 10:19:49 LOG6[main]: No trusted certificates found [/code] I copied a working config from Windows 7 64bit. Running stunnel 5.50

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A conclusive Manual for Web Nursing Classes
by silir10174＠mcuma.com 07 Mar '24

07 Mar '24

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Stunnel HA Options
by caspernetherlands＠gmail.com 07 Mar '24

07 Mar '24

Hello folks, I have seen a couple of other posts concerning this question but I am still unclear and wanted to see if there are any new options for 2024. What would the recommended setup for Stunnel look like for HA (high-availability)? All I need is basically to have two servers, one active and another one stand by and be able to fail over to the standby server when the active one becomes unavailable due to hardware failure, bad vmotion etc. Extra point if this setup offers automatic failover to DR as well, meaning failover to a third server that's also on standby in case of catastrophic failures on the first two. This almost looks like a load-balancing solution but not really. I say this because I tried to leverage F5 to accomplish this HA scenario and wasn't successful at it because of the way that the F5 performs active checks so often and how noisy that can be for network perimeter security setups. My main request is the local HA though, I can come up with a solution for DR later on. Any recommendation is appreciated. Thank you in advance!

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possible typo in manpage imap example
by alisonatwork＠outlook.com 05 Mar '24

05 Mar '24

Hi, It's possible that I am missing something obvious, but I was reading the manpage today and it seems like the example suggesting how to configure an email client for tunneled imap is incorrect. It suggests that the user configure their client to connect to port 119, but then the example stunnel config shows accept = 143. If this is indeed incorrect, I think the following files need to be modified to change 119 to 143: doc/stunnel.8.in doc/stunnel.html.in doc/stunnel.pl.8.in doc/stunnel.pl.html.in doc/stunnel.pl.pod.in doc/stunnel.pod.in Regards, Alison

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