stunnel-users

3 participants
3308 discussions

Upgrade from 5.03 to 5.35
by Hon Quach 07 Sep '16

07 Sep '16

Hi, When I perform the upgrade the stunnel service won't start, it tries to load the pem files but it is failing. I noticed when I install stunnel on my test system, the conf file is different from the version 5.03. I'm looking for documentation a on how to perform a clean upgrade but I'm having difficulty finding that information. Thanks! Sent from my iPhone

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stunnel 5.x no answer in server mode?
by Ulli Horlacher 31 Aug '16

31 Aug '16

I use stunnel as a https proxy for my own http server (*). The server mode of stunnel 5.x does not work any more. It accepts the connection and then immediatelly closes it without sending back any data. stunnel 4.x is working fine (for many years!), with the same configuration. Here is my (test) config which shows the problem (host is Ubuntu 16.04): root@xerus:/tmp# cat stunnel.conf pid = /tmp/stunnel.pid output = /home/fex/spool/stunneld.log debug = debug fips = no foreground = yes [https] accept = 443 cert = /home/fex/etc/stunnel.pem sslVersion = all TIMEOUTclose = 1 exec = perl execargs = perl -T /home/fex/bin/fexsrv stunnel root@xerus:/tmp# /opt/stunnel-5.35/bin/stunnel stunnel.conf 2016.08.30 18:58:55 LOG7[ui]: Clients allowed=500 2016.08.30 18:58:55 LOG5[ui]: stunnel 5.35 on x86_64-unknown-linux-gnu platform 2016.08.30 18:58:55 LOG5[ui]: Compiled/running with OpenSSL 1.0.2g-fips 1 Mar 2016 2016.08.30 18:58:55 LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2016.08.30 18:58:55 LOG7[ui]: errno: (*__errno_location ()) 2016.08.30 18:58:55 LOG5[ui]: Reading configuration from file /tmp/stunnel.conf 2016.08.30 18:58:55 LOG5[ui]: UTF-8 byte order mark not detected 2016.08.30 18:58:55 LOG5[ui]: FIPS mode disabled 2016.08.30 18:58:55 LOG7[ui]: Compression disabled 2016.08.30 18:58:55 LOG7[ui]: Snagged 64 random bytes from /root/.rnd 2016.08.30 18:58:55 LOG7[ui]: Wrote 1024 new random bytes to /root/.rnd 2016.08.30 18:58:55 LOG7[ui]: PRNG seeded successfully 2016.08.30 18:58:55 LOG6[ui]: Initializing service [https] 2016.08.30 18:58:55 LOG6[ui]: Loading certificate from file: /home/fex/etc/stunnel.pem 2016.08.30 18:58:55 LOG6[ui]: Certificate loaded from file: /home/fex/etc/stunnel.pem 2016.08.30 18:58:55 LOG6[ui]: Loading private key from file: /home/fex/etc/stunnel.pem 2016.08.30 18:58:55 LOG6[ui]: Private key loaded from file: /home/fex/etc/stunnel.pem 2016.08.30 18:58:55 LOG7[ui]: Private key check succeeded 2016.08.30 18:58:55 LOG7[ui]: DH initialization 2016.08.30 18:58:55 LOG7[ui]: Using DH parameters from /home/fex/etc/stunnel.pem 2016.08.30 18:58:55 LOG6[ui]: 1024-bit DH parameters loaded 2016.08.30 18:58:55 LOG7[ui]: ECDH initialization 2016.08.30 18:58:55 LOG7[ui]: ECDH initialized with curve prime256v1 2016.08.30 18:58:55 LOG7[ui]: SSL options: 0x03004004 (+0x03004000, -0x00000000) 2016.08.30 18:58:55 LOG5[ui]: Configuration successful 2016.08.30 18:58:55 LOG7[ui]: Listening file descriptor created (FD=7) 2016.08.30 18:58:55 LOG7[ui]: Option SO_REUSEADDR set on accept socket 2016.08.30 18:58:55 LOG7[ui]: Service [https] (FD=7) bound to 0.0.0.0:443 2016.08.30 18:58:55 LOG7[ui]: Created pid file /tmp/stunnel.pid (here comes the https client connect) 2016.08.30 18:59:20 LOG7[ui]: Found 1 ready file descriptor(s) 2016.08.30 18:59:20 LOG7[ui]: FD=4 events=0x2001 revents=0x0 2016.08.30 18:59:20 LOG7[ui]: FD=7 events=0x2001 revents=0x1 2016.08.30 18:59:20 LOG7[ui]: Service [https] accepted (FD=3) from 127.0.0.1:44166 2016.08.30 18:59:20 LOG7[0]: Service [https] started 2016.08.30 18:59:20 LOG7[0]: Option TCP_NODELAY set on local socket 2016.08.30 18:59:20 LOG5[0]: Service [https] accepted connection from 127.0.0.1:44166 2016.08.30 18:59:20 LOG6[0]: Peer certificate not required 2016.08.30 18:59:20 LOG7[0]: SSL state (accept): before/accept initialization 2016.08.30 18:59:20 LOG7[0]: SNI: no virtual services defined 2016.08.30 18:59:20 LOG7[0]: New session callback 2016.08.30 18:59:20 LOG7[0]: 1 server accept(s) requested 2016.08.30 18:59:20 LOG7[0]: 1 server accept(s) succeeded 2016.08.30 18:59:20 LOG7[0]: 0 server renegotiation(s) requested 2016.08.30 18:59:20 LOG7[0]: 0 session reuse(s) 2016.08.30 18:59:20 LOG7[0]: 0 internal session cache item(s) 2016.08.30 18:59:20 LOG7[0]: 0 internal session cache fill-up(s) 2016.08.30 18:59:20 LOG7[0]: 0 internal session cache miss(es) 2016.08.30 18:59:20 LOG7[0]: 0 external session cache hit(s) 2016.08.30 18:59:20 LOG7[0]: 0 expired session(s) retrieved 2016.08.30 18:59:20 LOG6[0]: SSL accepted: new session negotiated 2016.08.30 18:59:20 LOG6[0]: No peer certificate received 2016.08.30 18:59:20 LOG6[0]: Negotiated TLSv1.2 ciphersuite ECDHE-RSA-AES128-SHA256 (128-bit encryption) 2016.08.30 18:59:20 LOG7[0]: Compression: null, expansion: null 2016.08.30 18:59:20 LOG6[0]: Local mode child started (PID=30833) 2016.08.30 18:59:20 LOG7[0]: Option TCP_NODELAY set on remote socket 2016.08.30 18:59:20 LOG7[0]: Remote descriptor (FD=11) initialized 2016.08.30 18:59:20 LOG6[0]: Read socket closed (readsocket) 2016.08.30 18:59:20 LOG7[0]: Sending close_notify alert 2016.08.30 18:59:20 LOG7[0]: SSL alert (write): warning: close notify 2016.08.30 18:59:20 LOG6[0]: SSL_shutdown successfully sent close_notify alert 2016.08.30 18:59:20 LOG7[ui]: Found 1 ready file descriptor(s) 2016.08.30 18:59:20 LOG7[ui]: FD=4 events=0x2001 revents=0x1 2016.08.30 18:59:20 LOG7[ui]: FD=7 events=0x2001 revents=0x0 2016.08.30 18:59:20 LOG7[ui]: Dispatching signals from the signal pipe 2016.08.30 18:59:20 LOG7[ui]: Processing SIGCHLD 2016.08.30 18:59:20 LOG6[ui]: Child process 30833 finished with code 1 2016.08.30 18:59:20 LOG7[ui]: Signal pipe is empty 2016.08.30 18:59:20 LOG3[0]: socket fd: Broken pipe (32) 2016.08.30 18:59:20 LOG6[0]: writesocket: Socket is closed 2016.08.30 18:59:20 LOG5[0]: Connection closed: 0 byte(s) sent to SSL, 23 byte(s) sent to socket 2016.08.30 18:59:20 LOG7[0]: Remote descriptor (FD=11) closed 2016.08.30 18:59:20 LOG7[0]: Local descriptor (FD=3) closed 2016.08.30 18:59:20 LOG7[0]: Service [https] finished (0 left) The client receives no data at all, the connection is closed by the server (stunnel). As I wrote: with stunnel 4.27 everything works as expected. Does stunnel 5.x need another configuration? (*) http://fex.rus.uni-stuttgart.de/ -- Ullrich Horlacher Server und Virtualisierung Rechenzentrum TIK Universitaet Stuttgart E-Mail: horlacher(a)tik.uni-stuttgart.de Allmandring 30a Tel: ++49-711-68565868 70569 Stuttgart (Germany) WWW: http://www.tik.uni-stuttgart.de/ REF:<20160831074057.GA13703(a)rus.uni-stuttgart.de>

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Issue with stunnel over squid
by Mike McPhee 30 Aug '16

30 Aug '16

Hello, I have a windows machine running as a stunnel client that establishes a session but then, when launching an SSH session to my loopback crashes. Putty reports that the "Server unexpectedly closed the network connection." Here are the logs: 2016.08.30 16:06:08 LOG5[main]: Reading configuration from file stunnel.conf 2016.08.30 16:06:08 LOG5[main]: UTF-8 byte order mark detected 2016.08.30 16:06:08 LOG5[main]: FIPS mode disabled 2016.08.30 16:06:08 LOG4[main]: Service [squid] needs authentication to prevent MITM attacks 2016.08.30 16:06:08 LOG5[main]: Configuration successful 2016.08.30 16:06:17 LOG5[2]: Service [squid] accepted connection from 127.0.0.1:55791 2016.08.30 16:06:17 LOG5[2]: s_connect: connected 10.5.8.74:8888 2016.08.30 16:06:17 LOG5[2]: Service [squid] connected remote server from 10.5.8.69:55792 2016.08.30 16:06:17 LOG5[2]: Connection closed: 28 byte(s) sent to SSL, 0 byte(s) sent to socket Here is the server-side stunnel.conf: sslVersion = all options = NO_SSLv2 client = no cert = /etc/stunnel/server.pem pid = /var/run/stunnel.pid output = /var/log/stunnel [squid] accept = 8888 connect = 127.0.0.1:3128 cert = /etc/stunnel/stunnel.pem [openvpn] client = no accept = 993 connect = 34567 Here is the client side (Windows 7): cert = stunnel.pem client = yes [squid] accept = 127.0.0.1:8080 connect = 10.5.8.74:8443 I seem to be negotiating all of the appropriate keys, openvpn and squid3 are verified running, and have iptables configured, so I am not sure what I am missing. Can anyone assist? Thanks in advance! Mike

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-reopen for Ubuntu?
by mguyre＠comcast.net 24 Aug '16

24 Aug '16

Are there any plans to add the -reopen functionality to other operating systems? Thanks Mike

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[Stunnel] [Android x86] Compilation
by John Fisherman 22 Aug '16

22 Aug '16

Dear all, I am currently trying to make stunnel work for an Android x86 architecture. The android binary found on the stunnel official website is not supported on x86 architecture, so I'd like to cross-compile it myself using the 'configure' options. I did not find much informations about this around the web, could you give me some advices or at least tell me if it is possible to make Stunnel work on an Android x86 device ? Thanks in advance, Regards, - John

1 0

Stunnel exits with timeout
by SP 19 Aug '16

19 Aug '16

Summary of problem (configuration and log details below): I am attempting to configure Stunnel to run a pop3s service on our server so that users can retrieve email securely. Stunnel is started as a systemctl service. If I include both the following in the stunnel.conf: accept = mail.myserver.net:995 connect = localhost:110 then systemctl will exit immediately with: Service [pop3s]: Each service must define two endpoints stunnel.service: Control process exited, code=exited status=1 Failed to start SSL tunnel for network daemons. If I comment the connect to 110 then it will start and hang then eventually timeout: stunnel.service: Failed with result 'timeout'. Below is my stunnel.conf and log excerpt from the start with the connect to 110 commented out. I would greatly appreciate any advice. ---stunnel.conf setuid = nobody setgid = nobody pid = /usr/local/var/lib/stunnel/var/run/stunnel.pid foreground = yes ;debug = info debug = 7 sslVersion = TLSv1.2 output = /usr/local/var/lib/stunnel/var/log/stunnel.log ;ciphers = HIGH:MEDIUM:+DH:!SSLv2:!aNULL:+SHA256:+SHA1:+MD5 ciphers = HIGH:+3DES:+DH:!aNULL:!SSLv2 transparent = yes delay = no fips = no compression = deflate client = no [pop3s] accept = mail.myserver.net:995 ;connect = localhost:110 cert = /etc/stunnel/stunnel.pem key = /etc/stunnel/stunnel.pem exec = /usr/local/sbin/gnu-pop3d execargs = --debug=000 --mdn --timeout=60 --ipv6 ----log excerpt ----- 2016.08.17 15:08:55 LOG7[ui]: Clients allowed=500 2016.08.17 15:08:55 LOG5[ui]: stunnel 5.35 on x86_64-unknown-linux-gnu platform 2016.08.17 15:08:55 LOG5[ui]: Compiled/running with OpenSSL 1.0.2h 3 May 2016 2016.08.17 15:08:55 LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2016.08.17 15:08:55 LOG7[ui]: errno: (*__errno_location ()) 2016.08.17 15:08:55 LOG5[ui]: Reading configuration from file /etc/stunnel/stunnel.conf 2016.08.17 15:08:55 LOG5[ui]: UTF-8 byte order mark not detected 2016.08.17 15:08:55 LOG7[cron]: Cron thread initialized 2016.08.17 15:08:55 LOG5[ui]: FIPS mode disabled 2016.08.17 15:08:55 LOG6[ui]: Compression enabled: 1 method(s) 2016.08.17 15:08:55 LOG7[ui]: Snagged 64 random bytes from /dev/urandom 2016.08.17 15:08:55 LOG7[ui]: PRNG seeded successfully 2016.08.17 15:08:55 LOG6[ui]: Initializing service [pop3s] 2016.08.17 15:08:55 LOG6[ui]: Loading certificate from file: /etc/stunnel/stunnel.pem 2016.08.17 15:08:55 LOG6[ui]: Certificate loaded from file: /etc/stunnel/stunnel.pem 2016.08.17 15:08:55 LOG6[ui]: Loading private key from file: /etc/stunnel/stunnel.pem 2016.08.17 15:08:55 LOG6[ui]: Private key loaded from file: /etc/stunnel/stunnel.pem 2016.08.17 15:08:55 LOG7[ui]: Private key check succeeded 2016.08.17 15:08:55 LOG7[ui]: DH initialization 2016.08.17 15:08:55 LOG7[ui]: Could not load DH parameters from /etc/stunnel/stunnel.pem 2016.08.17 15:08:55 LOG6[ui]: Using dynamic DH parameters 2016.08.17 15:08:55 LOG7[ui]: ECDH initialization 2016.08.17 15:08:55 LOG7[ui]: ECDH initialized with curve prime256v1 2016.08.17 15:08:55 LOG7[ui]: SSL options: 0x03004004 (+0x03004000, -0x00000000) 2016.08.17 15:08:55 LOG5[ui]: Configuration successful 2016.08.17 15:08:55 LOG7[ui]: Listening file descriptor created (FD=7) 2016.08.17 15:08:55 LOG7[ui]: Option SO_REUSEADDR set on accept socket 2016.08.17 15:08:55 LOG7[ui]: Service [pop3s] (FD=7) bound to 60.62.114.105:995 2016.08.17 15:08:55 LOG6[cron]: Executing cron jobs 2016.08.17 15:08:55 LOG7[ui]: Created pid file /usr/local/var/lib/stunnel/var/run/stunnel.pid 2016.08.17 15:08:55 LOG5[cron]: Updating DH parameters 2016.08.17 15:10:01 LOG5[cron]: DH parameters updated 2016.08.17 15:10:01 LOG6[cron]: Cron jobs completed in 66 seconds 2016.08.17 15:10:01 LOG7[cron]: Waiting 86334 seconds 2016.08.17 15:10:25 LOG7[ui]: Found 1 ready file descriptor(s) 2016.08.17 15:10:25 LOG7[ui]: FD=4 events=0x2001 revents=0x1 2016.08.17 15:10:25 LOG7[ui]: FD=7 events=0x2001 revents=0x0 2016.08.17 15:10:25 LOG7[ui]: Dispatching signals from the signal pipe 2016.08.17 15:10:25 LOG7[ui]: Processing SIGNAL_TERMINATE 2016.08.17 15:10:25 LOG5[ui]: Terminated 2016.08.17 15:10:25 LOG7[ui]: Closing service [pop3s] 2016.08.17 15:10:25 LOG7[ui]: Service [pop3s] closed (FD=7) 2016.08.17 15:10:25 LOG7[ui]: Service [pop3s] closed 2016.08.17 15:10:25 LOG7[ui]: removing pid file /usr/local/var/lib/stunnel/var/run/stunnel.pid

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Logging Issues Causing Crash?
by Randall LeJeune 08 Aug '16

08 Aug '16

Hello all, Has anyone experienced a full log file causing stunnel issues in the past? We tried upgrading from 4.56 to 5.17 and the upgrade seemed to go fine at first, but a day or so later we began to have some disconnects. Later we downgraded to 5.01 which worked OK at first, but then we ran into the same kinds of problems again after a few days. We eventually put the stunnel.log file on a separate filesystem, but I am curious, has anyone else experienced any issues like this? Thanks, Randy

3 2

Config was working. Now it isn't after reboot
by Lee Savidge 02 Aug '16

02 Aug '16

I just reinstalled stunnel the latest version. When running I went through the creation of the pem file. I put in UK for the country code and the company name and put a . for everything else. It finished, I start the GUI and it works. I edited the config file to comment out the gmail IMAP section and reload it and it was fine. I rebooted, now it tells me tehre is an error in the config file. Why? I keep getting this problem. Rebooting seems to break the config somehow. Log shows this when stunnel starts: [ ] Cron thread initialized [ ] Running on Windows 6.1 [ ] No limit detected for the number of clients [.] stunnel 5.35 on x86-pc-msvc-1500 platform [.] Compiled/running with OpenSSL 1.0.2h-fips 3 May 2016 [.] Threading:WIN32 Sockets:SELECT,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI [ ] errno: (*_errno()) [ ] GUI message loop initialized [ ] Running on Windows 6.1 [.] Reading configuration from file stunnel.conf [.] UTF-8 byte order mark detected [.] FIPS mode disabled [ ] Compression disabled [ ] Snagged 64 random bytes from C:/.rnd [ ] Wrote 1024 new random bytes to C:/.rnd [ ] PRNG seeded successfully [ ] Initializing service [gmail-pop3] [ ] No certificate or private key specified [ ] SSL options: 0x03000004 (+0x03000000, -0x00000000) [ ] Initializing service [gmail-smtp] [ ] No certificate or private key specified [ ] SSL options: 0x03000004 (+0x03000000, -0x00000000) [.] Configuration successful [ ] Listening file descriptor created (FD=388) [ ] Option SO_EXCLUSIVEADDRUSE set on accept socket [ ] Service [gmail-pop3] (FD=388) bound to 127.0.0.1:110 [ ] Listening file descriptor created (FD=392) [ ] Option SO_EXCLUSIVEADDRUSE set on accept socket [!] bind: Permission denied (WSAEACCES) (10013) [!] Error binding service [gmail-smtp] to 127.0.0.1:25 [ ] Closing service [gmail-pop3] [ ] Service [gmail-pop3] closed (FD=388) [ ] Service [gmail-pop3] closed [ ] Closing service [gmail-smtp] [ ] Service [gmail-smtp] closed [!] Server is down [ ] Executing cron jobs [ ] Cron jobs completed in 0 seconds [ ] Waiting 86400 seconds The config file contains this: debug = debug output = stunnel.log [gmail-pop3] client = yes accept = 127.0.0.1:110 connect = pop.gmail.com:995 verifyChain = yes CAfile = ca-certs.pem checkHost = pop.gmail.com OCSPaia = yes [gmail-smtp] client = yes accept = 127.0.0.1:25 connect = smtp.gmail.com:465 verifyChain = yes CAfile = ca-certs.pem checkHost = smtp.gmail.com OCSPaia = yes I have pasted in only the stuff that isn't commented out. Why does this not work after a reboot? It makes no sense. -- =-----------------= Lee Savidge =-----------------= --

2 2

Installation problem on Windows 2003
by Tom Eberhard 01 Aug '16

01 Aug '16

Hello stunnel-users: I'm trying to install stunnel 5.35 on a Windows 2003 box, 32-bit. The installer runs to completion, but we get an error from SimpleFC: SimpleFC::AddApplication failed to add stunnel What is causing this error to come up, and what do I have to do to fix it? Googling just showed that SimpleFC is a plugin to interact with the Windows Firewall. Thanks, Tom This e-mail is intended solely for the person or entity to which it is addressed and may contain confidential and/or privileged information. Any review, dissemination, copying, printing or other use of this e-mail by persons or entities other than the addressee is prohibited. If you have received this e-mail in error, please contact the sender immediately and delete the material from any computer.

1 0

Client-side SNI
by Vincent Deschenes 01 Aug '16

01 Aug '16

Hi, Anyone know if there is anything special to do to get ServerName sent when using stunnel in client mode to be able to connect to SNI enabled server? Using latest version of stunnel and openssl. Will stunnel use the name specified in the "connect=" config ? Thanks, Regards, Vincent Deschenes Ing. PMP Director of Operations Stelvio Inc. (+1) 514-281-8570

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