- stunnel-users - stunnel.org

TLS alert (read): warning: close notify
by trashrap22＠gmail.com 18 May '23

18 May '23

Hi All, Hopefully the last question with my struggles! Stunnel connects and the initial TLS connection works - but then it seems the client or server (I am client) does not trust the psk key? Any ideas? Note - part of the previous issue was creating a 64B/512b PSK and NOT a 32/B/256b psk. I created that key and shared it with the server. See below line referencing 256bit encryption? May 18 16:34:38 user-Linux stunnel: LOG5[0]: Service [** redacted **] connected remote server from ** redacted ** May 18 16:34:38 user-Linux stunnel: LOG7[0]: Setting remote socket options (FD=11) May 18 16:34:38 user-Linux stunnel: LOG7[0]: Option TCP_NODELAY set on remote socket May 18 16:34:38 user-Linux stunnel: LOG7[0]: Remote descriptor (FD=11) initialized May 18 16:34:38 user-Linux stunnel: LOG6[0]: SNI: sending servername: ** redacted ** May 18 16:34:38 user-Linux stunnel: LOG6[0]: Peer certificate not required May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): before SSL initialization May 18 16:34:38 user-Linux stunnel: LOG7[0]: Initializing application specific data for session authenticated May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write client hello May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write client hello May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read server hello May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read server key exchange May 18 16:34:38 user-Linux stunnel: LOG6[0]: Client certificate not requested May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read server done May 18 16:34:38 user-Linux stunnel: LOG6[0]: PSK client configured for identity "client" May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write client key exchange May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write change cipher spec May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write finished May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS write finished May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read server session ticket May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read change cipher spec May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS state (connect): SSLv3/TLS read finished May 18 16:34:38 user-Linux stunnel: LOG7[0]: New session callback May 18 16:34:38 user-Linux stunnel: LOG6[0]: No peer certificate received May 18 16:34:38 user-Linux stunnel: LOG6[0]: Session id: ***** redacted **** May 18 16:34:38 user-Linux stunnel: LOG7[0]: 1 client connect(s) requested May 18 16:34:38 user-Linux stunnel: LOG7[0]: 1 client connect(s) succeeded May 18 16:34:38 user-Linux stunnel: LOG7[0]: 0 client renegotiation(s) requested May 18 16:34:38 user-Linux stunnel: LOG7[0]: 0 session reuse(s) May 18 16:34:38 user-Linux stunnel: LOG6[0]: TLS connected: new session negotiated May 18 16:34:38 user-Linux stunnel: LOG6[0]: TLSv1.2 ciphersuite: ECDHE-PSK-CHACHA20-POLY1305 (256-bit encryption) May 18 16:34:38 user-Linux stunnel: LOG7[0]: Compression: null, expansion: null May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS alert (read): warning: close notify May 18 16:34:38 user-Linux stunnel: LOG6[0]: TLS closed (SSL_read) May 18 16:34:38 user-Linux stunnel: LOG7[0]: Sent socket write shutdown May 18 16:34:38 user-Linux stunnel: LOG6[0]: Read socket closed (readsocket) May 18 16:34:38 user-Linux stunnel: LOG7[0]: Sending close_notify alert May 18 16:34:38 user-Linux stunnel: LOG7[0]: TLS alert (write): warning: close notify May 18 16:34:38 user-Linux stunnel: LOG6[0]: SSL_shutdown successfully sent close_notify alert May 18 16:34:38 user-Linux stunnel: LOG5[0]: Connection closed: 98 byte(s) sent to TLS, 0 byte(s) sent to socket May 18 16:34:38 user-Linux stunnel: LOG7[0]: Remote descriptor (FD=11) closed May 18 16:34:38 user-Linux stunnel: LOG7[0]: Local descriptor (FD=3) closed May 18 16:34:38 user-Linux stunnel: LOG7[0]: Service [*redacted*]finished (0 left)

1 0

chroot jail on debian 11 for stunnel steps?
by trashrap22＠gmail.com 11 May '23

11 May '23

Does someone have all the steps in order to setup a chroot jail on debian 11 OS - I have followed [this](https://manpages.debian.org/testing/stunnel4/stunnel.8.en.html) mostly - but think I am going to miss some differences to Debian 11 and go down a rabbit hole. Anyone have done it on Debian 11 care to share the steps?

3 3

Re: stunnel not starting
by Christopher Schultz 10 May '23

10 May '23

Hello, On 5/10/23 00:28, d3rIIIe15ter Tier wrote: > Please advise why you strongly advise running stunnel in a chroot jail? Because: 1. It's insanely easy to do (it literally IS just "chroot=/path/to/jail") and 2. If there is a problem with stunnel (e.g. security issue), the amount of damage an attacker can do is significantly limited -chris > On Tue, May 9, 2023 at 5:59 PM Christopher Schultz > <chris(a)christopherschultz.net <mailto:chris@christopherschultz.net>> wrote: > > Hello, > > On 5/9/23 11:13, d3rIIIe15ter Tier wrote: > > After giving access to var/log/secure/stunnel.log, I now get logs! > > > > There I get the following error: > > > > Cannot create pid file /var/run/stunnel4.pid > > create: Permission denied (13) > > What is the euid of the stunnel process? Does it have access to that > path? Are you using a chroot jail? (You should be.) Does that path > exist > in the chroot jail? Can the stunnel user write to that path? > > -chris > > > On Tue, May 9, 2023 at 4:34 PM d3rIIIe15ter Tier > <trashrap22(a)gmail.com <mailto:trashrap22@gmail.com> > > <mailto:trashrap22@gmail.com <mailto:trashrap22@gmail.com>>> wrote: > > > > You are right... bad mistake. > > > > Now I get: cannot open log file - which I am sure is a > permission > > thing since I need to use sudo to be able to write to that file. > > Any ideas further? > > > > On Tue, May 9, 2023 at 4:21 PM Christopher Schultz > > <chris(a)christopherschultz.net > <mailto:chris@christopherschultz.net> > <mailto:chris@christopherschultz.net > <mailto:chris@christopherschultz.net>>> > > wrote: > > > > Hello, > > > > On 5/9/23 10:17, d3rIIIe15ter Tier wrote: > > > I have tried changing the location to > > > > > > var/log/stunnel4/stunnel.log > > > var/log/stunnel4/stunnelLog > > > var/log/secure/ > > > var/log/secure/stunnel.log > > > etc/stunnel/stunnel.log > > > etc/stunnel/stunnelLog > > > > > > don't know how to fix it yet... > > I don't think the *value* is the problem. The problem is that > > you have > > defined "output" somewhere that isn't valid, such as within a > > specific > > service's section instead of as a global setting. > > > > -chris > > > > > On Tue, May 9, 2023 at 3:54 PM Christopher Schultz > > > <chris(a)christopherschultz.net > <mailto:chris@christopherschultz.net> > > <mailto:chris@christopherschultz.net > <mailto:chris@christopherschultz.net>> > > <mailto:chris@christopherschultz.net > <mailto:chris@christopherschultz.net> > > <mailto:chris@christopherschultz.net > <mailto:chris@christopherschultz.net>>>> wrote: > > > > > > Hello, > > > > > > On 5/9/23 09:40, trashrap22(a)gmail.com > <mailto:trashrap22@gmail.com> > > <mailto:trashrap22@gmail.com > <mailto:trashrap22@gmail.com>> <mailto:trashrap22@gmail.com > <mailto:trashrap22@gmail.com> > > <mailto:trashrap22@gmail.com <mailto:trashrap22@gmail.com>>> > > > wrote: > > > > Hi, I am on Debian - when I run "sudo stunnel > > stunnel.conf" I > > > get the following output: > > > > > > > > [ ] Clients allowed=500 > > > > [.] stunnel 5.56 on x86_64-pc-linux-gnu platform > > > > [.] Compiled with OpenSSL 1.1.1k 25 Mar 2021 > > > > [.] Running with OpenSSL 1.1.1n 15 Mar 2022 > > > > [.] Threading:PTHREAD Sockets:POLL,IPv6,SYSTEMD > > > TLS:ENGINE,FIPS,OCSP,PSK,SNI Auth:LIBWRAP > > > > [ ] errno: (*__errno_location ()) > > > > [.] Reading configuration from file > > /etc/stunnel/stunnel.conf > > > > [.] UTF-8 byte order mark not detected > > > > [.] FIPS mode disabled > > > > [ ] Compression disabled > > > > [ ] No PRNG seeding was required > > > > [!] /etc/stunnel/stunnel.conf:24: "output = > > /tmp/stunnel.log": > > > Specified option name is not valid here > > > > [ ] Deallocating section defaults > > > > > > > > When I run "sudo netstat -tulnp | grep -i > stunnel" I > > also get no > > > output - which means that stunnel is not starting up? > > > > > > The log message seems pretty specific to me. Maybe you > > should fix that? > > > > > > -chris > > > _______________________________________________ > > > stunnel-users mailing list -- > stunnel-users(a)stunnel.org <mailto:stunnel-users@stunnel.org> > > <mailto:stunnel-users@stunnel.org > <mailto:stunnel-users@stunnel.org>> > > > <mailto:stunnel-users@stunnel.org > <mailto:stunnel-users@stunnel.org> > > <mailto:stunnel-users@stunnel.org > <mailto:stunnel-users@stunnel.org>>> > > > To unsubscribe send an email to > > stunnel-users-leave(a)stunnel.org > <mailto:stunnel-users-leave@stunnel.org> > > <mailto:stunnel-users-leave@stunnel.org > <mailto:stunnel-users-leave@stunnel.org>> > > > <mailto:stunnel-users-leave@stunnel.org > <mailto:stunnel-users-leave@stunnel.org> > > <mailto:stunnel-users-leave@stunnel.org > <mailto:stunnel-users-leave@stunnel.org>>> > > > > > _______________________________________________ > > stunnel-users mailing list -- stunnel-users(a)stunnel.org > <mailto:stunnel-users@stunnel.org> > > <mailto:stunnel-users@stunnel.org > <mailto:stunnel-users@stunnel.org>> > > To unsubscribe send an email to > stunnel-users-leave(a)stunnel.org <mailto:stunnel-users-leave@stunnel.org> > > <mailto:stunnel-users-leave@stunnel.org > <mailto:stunnel-users-leave@stunnel.org>> > > > _______________________________________________ > stunnel-users mailing list -- stunnel-users(a)stunnel.org > <mailto:stunnel-users@stunnel.org> > To unsubscribe send an email to stunnel-users-leave(a)stunnel.org > <mailto:stunnel-users-leave@stunnel.org> >

1 0

stunnel not starting
by trashrap22＠gmail.com 09 May '23

09 May '23

Hi, I am on Debian - when I run "sudo stunnel stunnel.conf" I get the following output: [ ] Clients allowed=500 [.] stunnel 5.56 on x86_64-pc-linux-gnu platform [.] Compiled with OpenSSL 1.1.1k 25 Mar 2021 [.] Running with OpenSSL 1.1.1n 15 Mar 2022 [.] Threading:PTHREAD Sockets:POLL,IPv6,SYSTEMD TLS:ENGINE,FIPS,OCSP,PSK,SNI Auth:LIBWRAP [ ] errno: (*__errno_location ()) [.] Reading configuration from file /etc/stunnel/stunnel.conf [.] UTF-8 byte order mark not detected [.] FIPS mode disabled [ ] Compression disabled [ ] No PRNG seeding was required [!] /etc/stunnel/stunnel.conf:24: "output = /tmp/stunnel.log": Specified option name is not valid here [ ] Deallocating section defaults When I run "sudo netstat -tulnp | grep -i stunnel" I also get no output - which means that stunnel is not starting up?

4 7

Update newest version
by sportman7＠netzero.com 05 May '23

05 May '23

Have used Stunnel for years. To update I normally download the latest version and copy the files (DLL, exe, etc.) to my client's computers. But I tried this with latest update and I must be missing something as my app is not able to use this version. Went back to previous version but really need to know how to deliver the update to a client's computer. Thanks for any ideas on this.

2 2

stunnel and Google LDAP
by matt.colwell＠sduhsd.net 01 May '23

01 May '23

Hi, I'm trying to setup stunnel as a proxy to Google Workplace's LDAP service. I followed the instructions located here: https://apps.google.com/supportwidget/articlehome?hl=en&article_url=https%3… I've set the up on Ubuntu 22.04.2 LTS When attempting to connect I get the following error: SSL_read: ../ssl/record/rec_layer_s3.c:308: error:0A000126:SSL routines::unexpected eof while reading Connection reset: 217 byte(s) sent to TLS, 164 byte(s) sent to socket What might be my issue here? thanks

1 0

error starting / restarting /etc/init.d/stunnel4 on debian
by trashrap22＠gmail.com 28 Apr '23

28 Apr '23

Hi, I am not getting any stunnel logs. Though my syslog gives me the info below. The stunnel4 file in /usr/bin/ is empty? Apr 28 15:18:01 User-Linux systemd[1]: Starting LSB: Start or stop stunnel 4.x (TLS tunnel for network daemons)... Apr 28 15:18:01 User-Linux stunnel4[30850]: Starting TLS tunnels: /etc/stunnel/stunnel.conf: Apr 28 15:18:01 User-Linux stunnel4[30864]: /sbin/start-stop-daemon: unable to start /usr/bin/stunnel4 (Exec format error) Apr 28 15:18:01 User-Linux stunnel4[30850]: failed Apr 28 15:18:01 User-Linux stunnel4[30850]: You should check that you have specified the pid= in you configuration file

4 4

Is there installing instructions for Stunnel on Debian ?
by trashrap22＠gmail.com 26 Apr '23

26 Apr '23

Hi, I don't see installing instructions for Linux or rather for Debian specifically anywhere ?

4 4

FW: Help with disabling SSLv3
by Eberhard 14 Mar '23

14 Mar '23

Actually I think the SSLv3 in the log is a lie - as this is also in the log just before the below: TLS state (connect): before/connect initialization TLS state (connect): SSLv3 write client hello A TLS state (connect): SSLv3 read server hello A So I am thinking the eliptic curve stuff is more likely the issue? Eric VICS, LLC Eric S Eberhard 2933 W Middle Verde Rd Camp Verde, AZ 86322 928-567-3727 (land line) 928-301-7537 (cell phone) http://www.vicsmba.com <http://www.vicsmba.com/> https://www.facebook.com/groups/286143052248115 _____________________________________________ From: Eberhard <flash(a)vicsmba.com> Sent: Tuesday, March 14, 2023 9:15 AM To: 'stunnel-users(a)stunnel.org' <stunnel-users(a)stunnel.org> Subject: Help with disabling SSLv3 Importance: High I am suddenly getting errors from Fedex: TLS state (connect): SSLv3 read server certificate A error queue: 1408D010: error:1408D010:SSL routines:ssl3_get_key_exchange:EC lib error queue: 100AE081: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group error queue: 100AF003: error:100AF003:elliptic curve routines:EC_GROUP_NEW_FROM_DATA:BN lib SSL_connect: 3078072: error:03078072:bignum routines:BN_EXPAND_INTERNAL:bignum too long My .conf file says: output = /tmp/fedex.log debug = 7 RNDfile = /visanet/ssl/stunnel.rnd RNDoverwrite = yes client = yes connect = ws.fedex.com:443 ;connect = gateway.fedex.com:443 ;connect = wssha1ends12172016.fedex.com:443 sslVersion = TLSv1.2 options = NO_SSLv3 sslVersionMin = TLSv1.2 CAfile = /usr/local/ssl/certs/cacert.pem It is a very old version of stunnel but I cannot upgrade as this is a 15 year old AIX (IBM) computer stunnel 5.44 on powerpc-ibm-aix4.3.3.0 platform Compiled/running with OpenSSL 1.0.2 22 Jan 2015 Threading:FORK Sockets:POLL,IPv4 TLS:ENGINE,FIPS,OCSP,PSK,SNI Invalid configuration file name "--version" realpath: No such file or directory (2) Yet the log implies I am still trying SSLv3. Any ideas? Thanks in advance. Eric VICS, LLC Eric S Eberhard 2933 W Middle Verde Rd Camp Verde, AZ 86322 928-567-3727 (land line) 928-301-7537 (cell phone) http://www.vicsmba.com <http://www.vicsmba.com/> https://www.facebook.com/groups/286143052248115

2 1

Help with disabling SSLv3
by Eberhard 14 Mar '23

14 Mar '23

I am suddenly getting errors from Fedex: TLS state (connect): SSLv3 read server certificate A error queue: 1408D010: error:1408D010:SSL routines:ssl3_get_key_exchange:EC lib error queue: 100AE081: error:100AE081:elliptic curve routines:EC_GROUP_new_by_curve_name:unknown group error queue: 100AF003: error:100AF003:elliptic curve routines:EC_GROUP_NEW_FROM_DATA:BN lib SSL_connect: 3078072: error:03078072:bignum routines:BN_EXPAND_INTERNAL:bignum too long My .conf file says: output = /tmp/fedex.log debug = 7 RNDfile = /visanet/ssl/stunnel.rnd RNDoverwrite = yes client = yes connect = ws.fedex.com:443 ;connect = gateway.fedex.com:443 ;connect = wssha1ends12172016.fedex.com:443 sslVersion = TLSv1.2 options = NO_SSLv3 sslVersionMin = TLSv1.2 CAfile = /usr/local/ssl/certs/cacert.pem It is a very old version of stunnel but I cannot upgrade as this is a 15 year old AIX (IBM) computer stunnel 5.44 on powerpc-ibm-aix4.3.3.0 platform Compiled/running with OpenSSL 1.0.2 22 Jan 2015 Threading:FORK Sockets:POLL,IPv4 TLS:ENGINE,FIPS,OCSP,PSK,SNI Invalid configuration file name "--version" realpath: No such file or directory (2) Yet the log implies I am still trying SSLv3. Any ideas? Thanks in advance. Eric VICS, LLC Eric S Eberhard 2933 W Middle Verde Rd Camp Verde, AZ 86322 928-567-3727 (land line) 928-301-7537 (cell phone) http://www.vicsmba.com <http://www.vicsmba.com/> https://www.facebook.com/groups/286143052248115

1 0