stunnel-users

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3311 discussions

stunnel in Citrix Environment
by Bruce Liptak 21 May '21

21 May '21

Hello stunnel-users, Currently we have an application using stunnel being presented by a Citrix presentation server. The first user authenticates over stunnel with a PKI cert and every user thereafter creates a prompt for the first user again and again for each user that also tries to get into the app. Is there a way for stunnel to be separated based on something that pertains to the user trying to get access? We are using a PKI solution based on certificates. It's like every new user is hijacking the first users' stunnel session. Any help would be appreciated! Thank you, Bruce Liptak bliptakjr(a)gmail.com CCNA R&S | VCA-DCV | Linux+ | Security+ | Network+

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Unable to connect after upgrade of server
by Christopher Schultz 13 May '21

13 May '21

All, I upgraded one of my servers from Debian stretch to Debian buster yesterday and I've been unable to establish stunnel connections to it since then. When I connect, I get this log message on the server end: LOG5[0]: Service [svn-name] accepted connection from [client ip]:45382 LOG5[0]: Certificate accepted at depth=0: [cert dn] LOG3[0]: SSL_accept: 1414D17A: error:1414D17A:SSL routines:tls12_check_peer_sigalg:wrong curve LOG5[0]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket We are using EC certs and it's complaining about a curve. So, probably curve-related :) Our private key on the client side is using the secp256k1 curve. The client is using OpenSSL 1.0.2. The server is running OpenSSL 1.1.1. Both client and server support secp256k1. I tried specifying: curves = secp256k1 On the server side, but stunnel won't start, telling me that the configuration option isn't valid. I tried it in the global scope, and also in the service-scope and got the same error. Am I missing something? Minting new certificates (e.g. using prime256v1/secp256r1) is definitely an option, as my client openssl says it supports the NIST P-256 curve. $ openssl ecparam -list_curves secp256k1 : SECG curve over a 256 bit prime field secp384r1 : NIST/SECG curve over a 384 bit prime field secp521r1 : NIST/SECG curve over a 521 bit prime field prime256v1: X9.62/SECG curve over a 256 bit prime field That last one is NIST P-256. Is my best bet to mint a new certificate? Or is it possible to configure the server to allow this secp256k1 curve? -chris

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Stunnel static compile with open ssl error while running make command
by snainwar＠rediffmail.com 30 Apr '21

30 Apr '21

I am running RHEL release v 7.9 and have successfully compiled OpenSSL version 1.1.1k using the following configuration: ##> ./config --prefix=/usr/src/openssl-1.1.1 --openssldir=/etc/openssl The following paths are shown when I run command whereis openssl # whereis openssl openssl: /usr/lib64/openssl /usr/local/bin/openssl /usr/include/openssl /opt/openssl/bin/openssl /usr/src/openssl-1.1.1k/openssl.pc ]# I have download and prepared Stunnel version 5.59 from https://www.stunnel.org/ I am using the following configuration: ##> ./configure --with-ssl=/opt/openssl --enable-static When I compile Stunnel I get the following error message when we run Make install make[2]: Nothing to be done for `install-exec-am'. /bin/mkdir -p '/usr/local/share/doc/stunnel' /bin/install -c -m 644 README.md TODO.md COPYING.md AUTHORS.md NEWS.md PORTS.md BUGS.md COPYRIGHT.md CREDITS.md INSTALL.W32.md INSTALL.WCE.md INSTALL.FIPS.md '/usr/local/share/doc/stunnel' make install-data-hook make[3]: Entering directory `/usr/src/stunnel-5.59' ********************************************************* * Type 'make cert' to also install a sample certificate * ********************************************************* make[3]: Leaving directory `/usr/src/stunnel-5.59' make[2]: Leaving directory `/usr/src/stunnel-5.59' make[1]: Leaving directory `/usr/src/stunnel-5.59' [root@tvdcltmp001 stunnel-5.59]# Looks like Stunnel cannot link (probably because it can’t find the library) Does anyone know what the error might be? What changes do I need to make to configure for compilation.

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5.59 on win64
by Joe Phillips 29 Apr '21

29 Apr '21

I'm running win64 version 5.59. Installed service and it is started and running (set to automatic). But when I try to open the stunnel allUsers I get the error : stunnel server is down sue to an error, you need to exit and correct the problem. Click ok to see the error log. Shouldn't I be able to open the log window if the service is running? Also when the service is running there is no stunnel icon in the system tray. Please advise. Thanks [cid:[email protected]]

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Load Balancing
by Ramin Malekgahsemi 28 Apr '21

28 Apr '21

Hi Dear friend If have one stunnel client and have three Stunnel server My question IS How by RR user three server For client ? Forward and handle connection on three server (Client and access Port is once) thanks

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Stunnel static compile error while running Make command
by snainwar＠rediffmail.com 28 Apr '21

28 Apr '21

We are trying to static compile stunnel 5.59 with open ssl 1.1.1 on RHEl 6 and RHEL7 we are getting below error running command Make on the server /stunnel-5.59/src/cron.c:239: undefined reference to `BN_GENCB_new' /stunnel-5.59/src/cron.c:244: undefined reference to `BN_GENCB_set' stunnel-cron.o: In function `cron_dh_param': /stunnel-5.59/src/cron.c:219: undefined reference to `CRYPTO_THREAD_write_lock' /stunnel-5.59/src/cron.c:222: undefined reference to `CRYPTO_THREAD_unlock' /stunnel-5.59/src/cron.c:225: undefined reference to `CRYPTO_THREAD_read_lock' /stunnel-5.59/src/cron.c:229: undefined reference to `CRYPTO_THREAD_unlock' stunnel-cron.o: In function `cron_init': /stunnel-5.59/src/cron.c:78: undefined reference to `CRYPTO_THREAD_write_lock' /stunnel-5.59/src/cron.c:81: undefined reference to `CRYPTO_THREAD_unlock' stunnel-stunnel.o: In function `main_cleanup': /stunnel-5.59/src/stunnel.c:249: undefined reference to `CRYPTO_THREAD_write_lock' /stunnel-5.59/src/stunnel.c:263: undefined reference to `CRYPTO_THREAD_unlock' stunnel-stunnel.o: In function `process_connections': /stunnel-5.59/src/stunnel.c:889: undefined reference to `CRYPTO_THREAD_write_lock' /stunnel-5.59/src/stunnel.c:898: undefined reference to `CRYPTO_THREAD_unlock' stunnel-stunnel.o: In function `stunnel_info': /stunnel-5.59/src/stunnel.c:1034: undefined reference to `OpenSSL_version' /stunnel-5.59/src/stunnel.c:1036: undefined reference to `OpenSSL_version' /stunnel-5.59/src/stunnel.c:1041: undefined reference to `OpenSSL_version_num' collect2: error: ld returned 1 exit status make[2]: *** [stunnel] Error 1 make[2]: Leaving directory `/stunnel-5.59/src' make[1]: *** [all] Error 2 make[1]: Leaving directory `/stunnel-5.59/src' make: *** [all-recursive] Error 1 [root@tvdcltmp001 stunnel-5.59]#

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Stunnel static compile error while running Make command
by snainwar＠rediffmail.com 28 Apr '21

28 Apr '21

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Unable to reload Stunnel in Linux
by gorf＠hyperfunk.club 27 Apr '21

27 Apr '21

Hi, Normally, I would call "kill -HUP" with Stunnel's process ID to make it reload the configuration in Linux. I was very surprised when I tried that and the process stopped. Why would HUP cause it to exit, rather than reload the config? It doesn't do that on every machine. Thanks.

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Questions about two host connection using stunnel
by yfmao＠seas.upenn.edu 24 Apr '21

24 Apr '21

I am using stunnel4 to build a secure connection between two ubuntu hosts. One of the hosts (sender) will send "hello world" to another host (receiver). When I am using tcpdump in receiver to capture the packets sending from sender, I find out that one of the packets contains "hello world" in plaintext. From my understanding, stunnel will encrypt the content of "hello world" if everything is correct, so I shouldn't be able to see "hello world" in plaintext among any incoming packets. Any ideas about what is going wrong here? Here I will put my stunnel.config for your reference: cert = /home/ubuntu/client_server/stunnel.pem key = /home/ubuntu/client_server/stunnel.key debug = 7 output = /home/ubuntu/client_server/stunnel.log socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 options = ALL [services] accept = 6667 connect = some_ip_address:6666 TIMEOUTclose = 0

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Paid work
by David Rose (dsr) 24 Apr '21

24 Apr '21

I need an Stunnel config that will allow my Windows app that only can send SMTP without any authentication or encryption to be able to send email via Gmail or Office 365. Is this something that someone would be able to write for me and if so, what would you charge ? Thanks David --

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