stunnel-users

3306 discussions

stunnel 5.68 released
by Michał Trojnara 12 Feb '23

12 Feb '23

Dear Users, I have released version 5.68 of stunnel. ### Version 5.68, 2023.02.07, urgency: HIGH * Security bugfixes - OpenSSL DLLs updated to version 3.0.8. * New features - Added the new 'CAengine' service-level option to load a trusted CA certificate from an engine. - Added requesting client certificates in server mode with 'CApath' besides 'CAfile'. * Bugfixes - Fixed EWOULDBLOCK errors in protocol negotiation. - Fixed handling TLS errors in protocol negotiation. - Prevented following fatal TLS alerts with TCP resets. - Improved OpenSSL initialization on WIN32. - Improved testing suite stability. - Improved file read performance. - Improved logging performance. Home page: https://www.stunnel.org/ Download: https://www.stunnel.org/downloads.html SHA-256 hashes: dcd895ab088b043d4e0bafa8b934e7ab3e697293828dbe9fce46cb7609a7dacf stunnel-5.68.tar.gz 62807f6233c8a5693104c09b44ebde6cc395877d948651c3ff0767e07ccdd316 stunnel-5.68-win64-installer.exe 93291060fdfc889431e8bce5cfe875b23be2bac11e2338f8f8f84d509f1b33fa stunnel-5.68-android.zip Best regards, Mike

2 1

Cannot establish tunnel
by andrew.haworth＠roche.com 11 Feb '23

11 Feb '23

Hi, I am new to stunnel on a MAC. When I run stunnel with the enabled configuration [mllp-to-dip], I am prompted for a local password and then for my certificate passphrase. I am not able to establish a tunnel. See logs: Initializing service [mllp-to-dip] [ ] stunnel default security level set: 2 [ ] Ciphers: HIGH:!aNULL:!SSLv2:!DH:!kDHEPSK [ ] TLSv1.3 ciphersuites: TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256 [ ] TLS options: 0x2100000 (+0x0, -0x0) [ ] Session resumption enabled [ ] Loading certificate from file: /opt/homebrew/etc/stunnel/test_client.cert.pem [ ] Certificate loaded from file: /opt/homebrew/etc/stunnel/test_client.cert.pem [ ] Loading private key from file: /opt/homebrew/etc/stunnel/test_client_cert.pem [:] Insecure file permissions on /opt/homebrew/etc/stunnel/test_client_cert.pem [ ] Private key loaded from file: /opt/homebrew/etc/stunnel/test_client_cert.pem [ ] Private key check succeeded [:] Service [mllp-to-dip] needs authentication to prevent MITM attacks [ ] DH initialization skipped: client section [ ] ECDH initialization [ ] ECDH initialized with curves X25519:P-256:X448:P-521:P-384 [.] Configuration successful [ ] Deallocating deployed section defaults [ ] Binding service [mllp-to-dip] [ ] Listening file descriptor created (FD=9) [ ] Setting accept socket options (FD=9) [ ] Option SO_REUSEADDR set on accept socket [.] Binding service [mllp-to-dip] to :::6661: Address already in use (48) [ ] Listening file descriptor created (FD=9) [ ] Setting accept socket options (FD=9) [ ] Option SO_REUSEADDR set on accept socket [.] Binding service [mllp-to-dip] to 0.0.0.0:6661: Address already in use (48) [!] Binding service [mllp-to-dip] failed [ ] Unbinding service [mllp-to-dip] [ ] Service [mllp-to-dip] closed [ ] Deallocating deployed section defaults [ ] Deallocating section [mllp-to-dip] Can someone help with my troubleshooting steps?

4 5

Setup Error
by Paul Gabriel 11 Feb '23

11 Feb '23

Hi, I am attempting to setup stunnel 5.67 in Windows Server 2022 core. I believe I have enabled TLS 1.2. Here is the output of stunnel starting up: [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [ ] No limit detected for the number of clients [.] stunnel 5.67 on x64-pc-mingw32-gnu platform [.] Compiled/running with OpenSSL 3.0.7 1 Nov 2022 [.] Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,OCSP,PSK,SNI [ ] errno: (*_errno()) [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [.] Reading configuration from file C:\Program Files (x86)\stunnel\config\stunnel.conf [.] UTF-8 byte order mark detected [.] FIPS mode disabled [ ] Compression disabled [ ] No PRNG seeding was required [ ] Initializing service [Integration Profile 1] [ ] stunnel default security level set: 2 [ ] Ciphers: HIGH:!aNULL:!SSLv2:!DH:!kDHEPSK [ ] TLSv1.3 ciphersuites: TLS_AES_256_GCM_SHA384:TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256 [ ] TLS options: 0x2100000 (+0x0, -0x0) [ ] Session resumption enabled [ ] Loading certificate from file: art&music.pem [!] error queue: ssl/ssl_rsa.c:448: error:0A080002:SSL routines::system lib [!] error queue: crypto/bio/bss_file.c:300: error:10080002:BIO routines::system lib [!] SSL_CTX_use_certificate_chain_file: crypto/bio/bss_file.c:297: error:80000002:system library::No such file or directory [!] Service [Integration Profile 1]: Failed to initialize TLS context [!] Configuration failed [ ] Deallocating temporary section defaults [ ] Deallocating section [Integration Profile 1] Any suggestions on what is wrong? Thanks, Paul

2 1

Long time to tear off the certificate
by nizdiminov＠itopcase.ru 02 Feb '23

02 Feb '23

Good afternoon, I observe a problem in the operation of the stunnel. There are 5 active connections. I get an error **** Server unexpectedly disconnected Error performing handshake Before that, there is a pattern, it takes a very long time to tear off the certificate 5 мин. 2023.01.31 17:13:37 LOG7[15674:140480621389568]: open file /etc/stunnel/cert/eis/dit.cer with certificate 2023.01.31 17:18:25 LOG3[15674:140480621389568]: Credentials complete /opt/cprocsp/sbin/amd64/stunnel_thread -version stunnel 4.18 on x86_64-pc-linux-gnu Threading:PTHREAD Sockets:POLL,IPv6 Auth:LIBWRAP

1 0

Monitoring stunnel
by nizdiminov＠itopcase.ru 01 Feb '23

01 Feb '23

Good afternoon, tell me how best to monitor the stunnel? I use zabbix monitoring 5.4 , in my stunnel 5 connections 3 server 2 clients, all with certificate verification. It is necessary to monitor each connection separately. Maybe there is a template for zabbix monitoring 5.4 ?

1 0

help
by Gurjit Singh Jhutti 27 Jan '23

27 Jan '23

Is it possible to configure username and password for SMTP connection on Windows Server, did try this with any success in stunnel.conf [client] username = user password = password error: LOG6[main]: Initializing service [client] LOG3[main]: ....\stunnel.conf:73: "username = user": Specified option name is not valid here LOG3[main]: Configuration failed

1 0

Odd stunnel problem
by Phil Smith III 26 Jan '23

26 Jan '23

Well, odd to me. I use K9, a free Bayesian spam proxy I've used for ~20 years. It doesn't do TLS. So I have: Outlook <-> K9 <-> stunnel <-> Internet for email connections. This morning I wasn't getting anything on my dozen or so POP connections that go through that (Exchange email was fine). Restarted Outlook (making sure it had really closed), no joy. Then I noticed that while doing a mail check, K9 was throbbing for long periods. There's not much to do with K9, so next I looked at stunnel, whose log was full of: 2023.01.26 09:39:26 LOG3[18110]: No more addresses to connect 2023.01.26 09:39:36 LOG3[18111]: s_connect: s_poll_wait 146.20.147.244:995: TIMEOUTconnect exceeded Reloaded stunnel config and all is well. So, not a big deal, but.any guesses what was going on here? stunnel 5.57, Windows 10.

1 0

Stunnel activity issue
by Денис Голубятников 26 Jan '23

26 Jan '23

I have problems with stunnel on OS Windows. After a successful connection with stunnel, the connection drops after approximately 9 minutes of inactivity. On Linux, this problem was solved by changing this parametrs: net.ipv4.tcp_keepalive_time = 60 net.ipv4.tcp_keepalive_intvl = 30 net.ipv4.tcp_keepalive_probes = 20 I don't have access to the server side router, so I can't change anything. Stunnel log: 2023.01.25 17:18:10 LOG7[1]: Service [test] started 2023.01.25 17:18:10 LOG7[1]: Setting local socket options (FD=964) 2023.01.25 17:18:10 LOG7[1]: Option TCP_NODELAY set on local socket 2023.01.25 17:18:10 LOG5[1]: Service [test] accepted connection from 127.0.0.1:50145 2023.01.25 17:18:10 LOG6[1]: s_connect: connecting 225.179.85.93:18572 2023.01.25 17:18:10 LOG7[1]: s_connect: s_poll_wait 225.179.85.93:18572: waiting 10 seconds 2023.01.25 17:18:10 LOG7[1]: FD=716 ifds=rwx ofds=--- 2023.01.25 17:18:10 LOG5[1]: s_connect: connected 225.179.85.93:18572 2023.01.25 17:18:10 LOG5[1]: Service [onegomed] connected remote server from 192.168.1.84:50146 2023.01.25 17:18:10 LOG7[1]: Setting remote socket options (FD=716) 2023.01.25 17:18:10 LOG7[1]: Option TCP_NODELAY set on remote socket 2023.01.25 17:18:10 LOG7[1]: Remote descriptor (FD=716) initialized 2023.01.25 17:18:10 LOG6[1]: SNI: sending servername: 225.179.85.93 2023.01.25 17:18:10 LOG6[1]: Peer certificate not required 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): before SSL initialization 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS write client hello 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS write client hello 2023.01.25 17:18:10 LOG7[1]: Initializing application specific data for session authenticated 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS read server hello 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): TLSv1.3 read encrypted extensions 2023.01.25 17:18:10 LOG6[1]: Certificate verification disabled 2023.01.25 17:18:10 LOG6[1]: Certificate verification disabled 2023.01.25 17:18:10 LOG6[1]: Certificate verification disabled 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS read server certificate 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): TLSv1.3 read server certificate verify 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS read finished 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS write change cipher spec 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS write finished 2023.01.25 17:18:10 LOG7[1]: 2 client connect(s) requested 2023.01.25 17:18:10 LOG7[1]: 2 client connect(s) succeeded 2023.01.25 17:18:10 LOG7[1]: 0 client renegotiation(s) requested 2023.01.25 17:18:10 LOG7[1]: 0 session reuse(s) 2023.01.25 17:18:10 LOG6[1]: TLS connected: new session negotiated 2023.01.25 17:18:10 LOG6[1]: TLSv1.3 ciphersuite: TLS_AES_256_GCM_SHA384 (256-bit encryption) 2023.01.25 17:18:10 LOG6[1]: Peer temporary key: X25519, 253 bits 2023.01.25 17:18:10 LOG7[1]: Compression: null, expansion: null 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSL negotiation finished successfully 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSL negotiation finished successfully 2023.01.25 17:18:10 LOG7[1]: Initializing application specific data for session authenticated 2023.01.25 17:18:10 LOG7[1]: Deallocating application specific data for session connect address 2023.01.25 17:18:10 LOG7[1]: New session callback 2023.01.25 17:18:10 LOG7[1]: Deallocating application specific data for session connect address 2023.01.25 17:18:10 LOG6[1]: Session id: 8E91DBE369D9E16221CCA288A7C1F652AB045BAE96C19B4240B1B7F710069CCE 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS read server session ticket 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSL negotiation finished successfully 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSL negotiation finished successfully 2023.01.25 17:18:10 LOG7[1]: Initializing application specific data for session authenticated 2023.01.25 17:18:10 LOG7[1]: New session callback 2023.01.25 17:18:10 LOG7[1]: Deallocating application specific data for session connect address 2023.01.25 17:18:10 LOG6[1]: Session id: 6UIA254BF9D027B3D4BE5F966BDE9DE2058CF167C4EF0CD5A460958B698DF322 2023.01.25 17:18:10 LOG7[1]: TLS state (connect): SSLv3/TLS read server session ticket 2023.01.25 17:33:25 LOG3[1]: SSL_read: Connection reset by peer (WSAECONNRESET) (10054) 2023.01.25 17:33:25 LOG5[1]: Connection reset: 5184 byte(s) sent to TLS, 10344 byte(s) sent to socket 2023.01.25 17:33:25 LOG7[1]: Remote descriptor (FD=716) closed 2023.01.25 17:33:25 LOG7[1]: Local descriptor (FD=964) closed 2023.01.25 17:33:25 LOG7[1]: Service [test] finished (0 left)` I tried: * changing the windows registry: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\KeepAliveTime HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\KeepAliveInterval HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TcpMaxDataRetransmissions HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters\TdxPrematureConnectIndDisabled HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\InternetSetting\KeepAliveTimeout HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\InternetSetting\ServerInfoTimeout * changing stunnel config on client side: socket = l:SO_KEEPALIVE=1 socket = r:SO_KEEPALIVE=1 * changing parametrs on linux server side: net.ipv4.tcp_keepalive_time = 60 net.ipv4.tcp_keepalive_intvl = 30 net.ipv4.tcp_keepalive_probes = 20 * add server cert on stunnel client config; * downgrade and update stunnel. -- Gordon Stevenson Отправлено из Почты Mail.ru

1 0

forward all UDP port
by Ahmad Kiamanesh 23 Jan '23

23 Jan '23

Hi how can forward all inner UDP ports from one server to another server?

1 0

STunnel not passing traffic
by Gary Jackson 15 Jan '23

15 Jan '23

I have an application that sends XML encrypted traffic over TCP to Stunnel. Stunnel is supposed to unencrypt and send to backend application unencrypted, however no traffic is sent. I have used wireshark and I do see the client hello for tls1.2 and the server hello for tls 1.2 so the cipher negotiation is completed. Here is my config: sslVersionMax = TLSv1.2 options = -NO_SSLv3 [https] accept = 27015 connect = 27001 cert = cert.pem key = key.pem TIMEOUTclose = 0 STunnel Log in Debug 7 2023.01.13 14:03:42 LOG7[16572]: Service [https] started 2023.01.13 14:03:42 LOG7[16572]: Setting local socket options (FD=1888) 2023.01.13 14:03:42 LOG7[16572]: Option TCP_NODELAY set on local socket 2023.01.13 14:03:42 LOG5[16572]: Service [https] accepted connection from xx.xx.xx.xx:62478 2023.01.13 14:03:42 LOG6[16572]: Peer certificate not required 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): before SSL initialization 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): before SSL initialization 2023.01.13 14:03:42 LOG7[16572]: Decrypt session ticket callback 2023.01.13 14:03:42 LOG7[16572]: Initializing application specific data for session authenticated 2023.01.13 14:03:42 LOG7[16572]: SNI: no virtual services defined 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS read client hello 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write server hello 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write certificate 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write key exchange 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write server done 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write server done 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS read client key exchange 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS read change cipher spec 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS read finished 2023.01.13 14:03:42 LOG7[16572]: Generate session ticket callback 2023.01.13 14:03:42 LOG7[16572]: Initializing application specific data for session authenticated 2023.01.13 14:03:42 LOG7[16572]: Deallocating application specific data for session connect address 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write session ticket 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write change cipher spec 2023.01.13 14:03:42 LOG7[16572]: TLS state (accept): SSLv3/TLS write finished 2023.01.13 14:03:42 LOG7[16572]: 33 server accept(s) requested 2023.01.13 14:03:42 LOG7[16572]: 33 server accept(s) succeeded 2023.01.13 14:03:42 LOG7[16572]: 0 server renegotiation(s) requested 2023.01.13 14:03:42 LOG7[16572]: 0 session reuse(s) 2023.01.13 14:03:42 LOG7[16572]: 1 internal session cache item(s) 2023.01.13 14:03:42 LOG7[16572]: 0 internal session cache fill-up(s) 2023.01.13 14:03:42 LOG7[16572]: 0 internal session cache miss(es) 2023.01.13 14:03:42 LOG7[16572]: 0 external session cache hit(s) 2023.01.13 14:03:42 LOG7[16572]: 0 expired session(s) retrieved 2023.01.13 14:03:42 LOG6[16572]: TLS accepted: new session negotiated 2023.01.13 14:03:42 LOG6[16572]: TLSv1.2 ciphersuite: ECDHE-RSA-AES256-GCM-SHA384 (256-bit encryption) 2023.01.13 14:03:42 LOG3[16572]: SSL_get_peer_tmp_key: Peer suddenly disconnected 2023.01.13 14:03:42 LOG7[16572]: Compression: null, expansion: null 2023.01.13 14:03:42 LOG7[16572]: Deallocating application specific data for session connect address 2023.01.13 14:03:42 LOG6[16572]: s_connect: connecting 127.0.0.1:27001 2023.01.13 14:03:42 LOG7[16572]: s_connect: s_poll_wait 127.0.0.1:27001: waiting 10 seconds 2023.01.13 14:03:42 LOG7[16572]: FD=1472 ifds=rwx ofds=--- 2023.01.13 14:03:42 LOG5[16572]: s_connect: connected 127.0.0.1:27001 2023.01.13 14:03:42 LOG6[16572]: persistence: 127.0.0.1:27001 cached 2023.01.13 14:03:42 LOG5[16572]: Service [https] connected remote server from 127.0.0.1:56732 2023.01.13 14:03:42 LOG7[16572]: Setting remote socket options (FD=1472) 2023.01.13 14:03:42 LOG7[16572]: Option TCP_NODELAY set on remote socket 2023.01.13 14:03:42 LOG7[16572]: Remote descriptor (FD=1472) initialized 2023.01.13 14:03:42 LOG6[16572]: SSL_read: Socket is closed 2023.01.13 14:03:42 LOG6[16572]: TLS socket closed (SSL_read) 2023.01.13 14:03:42 LOG7[16572]: Sent socket write shutdown 2023.01.13 14:03:42 LOG5[16572]: Connection closed: 0 byte(s) sent to TLS, 0 byte(s) sent to socket 2023.01.13 14:03:42 LOG7[16572]: Remote descriptor (FD=1472) closed 2023.01.13 14:03:42 LOG7[16572]: Local descriptor (FD=1888) closed 2023.01.13 14:03:42 LOG7[16572]: Service [https] finished (1 left) Any assistance you can provide would be glorious! _________________________________ Gary Jackson

2 1

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