July 2023 - stunnel-users

Stunnel is not accepting TLS1.1 anymore?
by Bohnig＠gmx.de 13 Jul '23

13 Jul '23

Hi there, i have a problem (maybe with understanding) with stunnel. I'm using the newest version 5.70 but had this also with 5.66 and 5.69. My goal was to access an Exchange server IIS (on port 443, which understands only TLS1.1 and below) with TLS1.2 and upper. I was able to achieve this with the following config --------------------------- debug = 7 output = stunnel.log [Exserver] accept = 441 connect = 442 cert = stunneldd.pem TIMEOUTclose = 0 [Exclient] client = yes accept = 442 connect = 443 --------------------------- stunneldd.pem i made with openssl req -new -x509 -days 365 -nodes -config openssl.cnf -out stunneldd.pem -keyout stunneldd.pem This is working so far. My problem is, stunnel is no longer accepting TLS1.0 and TLS1.1. I need this for some clients which couldn't talk TLS1.2. But why? All infos i could find (and this was days, not hours) are showing that it should work. Even with the added line sllVerison = all or sslVersionMin = TLSv1 sslVersionMax = TLSv1.3 it ws not accepting TLS1 queries. My steps to confirm this: ------------------------- - install stunnel 5.70 - take the config shown above - make a cert with openssl req -new -x509 -days 365 -nodes -config openssl.cnf -out stunneldd.pem -keyout stunneldd.pem - start stunnel - test it with openssl s_client -connect localhost:441 -tls1_1 -debug stunnel log: ------------ 2023.07.13 09:53:04 LOG7[25]: TLS alert (write): fatal: internal error 2023.07.13 09:53:04 LOG3[25]: SSL_accept: ssl/t1_lib.c:3342: error:0A000076:SSL routines::no suitable signature algorithm I'm thinking, that the bind OpenSSL doesn't support TLS1.1 anymore but the [Exclient] which is talking to Port 443 uses TLS1.1. Or has the cert anything to do with it. I think no, because the andshake failed and that is befor the cert is used? What I'm missing? I want stunnel to accept TLs1.0, TLS1.1. TLS1.2 and upwards on the same port. Would be nice if anybody could help me with this? Many thanks.

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Default destination folder of stunnel-*-win64-installer.exe
by Yasuhiro Kimura 13 Jul '23

13 Jul '23

Hello, If you install stunnel on Windows with stunnel-*-win64-installer.exe, it installs everything under "C:\Program Files (x86)\stunnel" by default. But since it installs 64bit binaries, should default destination folder be "C:\Program Files\stunnel"? Regards.

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`tstunnel -(help|options|version)` outputs garbase with 5.70
by Yasuhiro Kimura 13 Jul '23

13 Jul '23

Hello, With tstunnel.exe installed with stunnel-5.70-win64-installer.exe, `tstunnel -help', `tstunnel -options` and `tstunnel -version` output gabases. The issue doesn't happen with either stunnel 5.70 on Unix or tstunnel.exe installed with stunnel-5.69-win64-installer.exe. Regards. --- Yasuhiro Kimura

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stunnel 5.70 released
by Michal Trojnara 12 Jul '23

12 Jul '23

Dear Users, I have released version 5.70 of stunnel. ### Version 5.70, 2023.07.12, urgency: HIGH * Security bugfixes - OpenSSL DLLs updated to version 3.0.9. - OpenSSL FIPS Provider updated to version 3.0.8. * Bugfixes - Fixed TLS socket EOF handling with OpenSSL 3.x. This bug caused major interoperability issues between stunnel built with OpenSSL 3.x and Microsoft's Schannel Security Support Provider (SSP). - Fixed reading certificate chains from PKCS#12 files. * Features - Added configurable delay for the "retry" option. Home page: https://www.stunnel.org/ Download: https://www.stunnel.org/downloads.html SHA-256 hashes: 7bbc7b9e9a988d76301325db4c110ec360a98ffb8a221c7accbff9c0a8bae2f3 stunnel-5.70.tar.gz c50fb79329ddbf095e65ba8817a0249188aa5b25f15557f8504d8f65876034d9 stunnel-5.70-win64-installer.exe df87f71596ddd8730a5394fd3795b32689664816c0aa87e206e94fdab540f672 stunnel-5.70-android.zip Best regards, Mike

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Cannot open PSKsecrets file
by trashrap22＠gmail.com 11 Jul '23

11 Jul '23

Hi, I am setting up stunnel on my Windows 10 PC, but must be missing something small with the error I am getting: [ ] Initializing inetd mode configuration [ ] Running on Windows 6.2 [ ] No limit detected for the number of clients [.] stunnel 5.69 on x64-pc-mingw32-gnu platform [.] Compiled/running with OpenSSL 3.0.8 7 Feb 2023 [.] 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 [Sql_Secure_Trek-<port>] [!] Cannot open PSKsecrets file [!] C:\Program Files (x86)\stunnel\config\stunnel.conf:68: "PSKsecrets = "C:\Program Files (x86)\stunnel\config\pskSql.txt"": Failed to read PSK secrets [!] Configuration failed [ ] Deallocating temporary section defaults [ ] Deallocating section [Sql_Secure_Trek-<port>] Server is down Here is my .conf file: ;Global settings: debug = 7 output = stunnel.log sslVersion = all sslVersionMin = TLSv1.2 sslVersionMax = TLSv1.2 [Sql_Secure_Trek-<port>] client = yes accept = 0.0.0.0:<port> connect = <IP>:<port> ciphers = PSK PSKsecrets = "C:\Program Files (x86)\stunnel\config\pskSql.txt" Any ideas?

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stunnel 5.57 crashed while trying to write logs
by phananh.nguyen＠dxc.com 06 Jul '23

06 Jul '23

it crashed at the function log_raw. here is the backtrace == Backtrace #0 __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:49 #1 0x0000007f82ed54b4 in __GI_abort () at abort.c:79 #2 0x0000007f82f1f984 in __libc_message (action=action@entry=do_abort, fmt=fmt@entry=0x7f82fdc660 "%s\n") at ../sysdeps/posix/libc_fatal.c:155 #3 0x0000007f82f273dc in malloc_printerr (str=str@entry=0x7f82fd7bc8 "corrupted double-linked list") at malloc.c:5389 #4 0x0000007f82f27cc8 in unlink_chunk (p=p@entry=0x7f64012260, av=0x7f64000020) at malloc.c:1472 #5 0x0000007f82f27e48 in malloc_consolidate (av=av@entry=0x7f64000020) at malloc.c:4539 #6 0x0000007f82f29df0 in _int_malloc (av=av@entry=0x7f64000020, bytes=bytes@entry=8192) at malloc.c:3727 #7 0x0000007f82f2c5b0 in __libc_calloc (n=<optimized out>, elem_size=<optimized out>) at malloc.c:3448 #8 0x0000007f82f1e41c in __GI___open_memstream (bufloc=bufloc@entry=0x7f72ffc3f8, sizeloc=sizeloc@entry=0x7f72ffc400) at memstream.c:83 #9 0x0000007f82f7d274 in __vsyslog_internal (pri=31, pri@entry=7, fmt=fmt@entry=0x5584b5f930 "%s: %s", ap=..., mode_flags=mode_flags@entry=2) at ../misc/syslog.c:181 #10 0x0000007f82f7d810 in __syslog_chk (pri=pri@entry=7, flag=flag@entry=1, fmt=fmt@entry=0x5584b5f930 "%s: %s") at ../misc/syslog.c:136 #11 0x0000005584b45884 in syslog (__fmt=0x5584b5f930 "%s: %s", __pri=7) at /usr/include/bits/syslog.h:31 #12 log_raw (level=level@entry=7, stamp=stamp@entry=0x7f64003420 "2023.06.16 01:36:58", id=id@entry=0x7f64001120 "LOG7[19]", text=text@entry=0x7f6401b060 "Service [proxy-r] started", opt=<optimized out>, opt=<optimized out>) at ../../stunnel-5.57/src/log.c:263 #13 0x0000005584b45b88 in s_log (level=level@entry=7, format=format@entry=0x5584b5a780 "Service [%s] started") at ../../stunnel-5.57/src/log.c:192 #14 0x0000005584b454e8 in client_main (c=c@entry=0x7f82e30060) at ../../stunnel-5.57/src/client.c:178 #15 0x0000005584b45658 in client_thread (arg=0x7f82e30060) at ../../stunnel-5.57/src/client.c:130 #16 0x0000007f83026e64 in start_thread (arg=0x7fc21e457f) at pthread_create.c:463 #17 0x0000007f82f815dc in thread_start () at ../sysdeps/unix/sysv/linux/aarch64/clone.S:78 == Thread apply all backtrace full

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Using URL Subfolders to redirect traffic to a different service?
by hellmanandrew＠comcast.net 02 Jul '23

02 Jul '23

I want to be able to actually use stunnel as a reverse proxy by running everything through one port. How I want to do that is by using subfolders in a URL like: webpage.net/service1 webpage.net/service2 Basically, every subfolder will redirect to a different IP address or port offered by a server. Just not sure how I should configure this.

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