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3294 discussions

Getting Stunnel working with Verizon.net SMTP
by Gary Kuznitz 12 Jun '13

12 Jun '13

I can't seem to connect with email at Verizon.net SMTP. I can connect with POP3. The Stunnel.log shows: 2013.06.11 19:27:04 LOG5[3752:2524]: stunnel 4.56 on x86-pc-msvc-1500 platform 2013.06.11 19:27:04 LOG5[3752:2524]: Compiled/running with OpenSSL 1.0.1e-fips 11 Feb 2013 2013.06.11 19:27:04 LOG5[3752:2524]: Threading:WIN32 Sockets:SELECT,IPv6 SSL:ENGINE,OCSP,FIPS 2013.06.11 19:27:04 LOG5[3752:2524]: Reading configuration from file stunnel.conf 2013.06.11 19:27:04 LOG5[3752:2524]: FIPS mode is enabled 2013.06.11 19:27:04 LOG5[3752:2524]: Configuration successful I have IPv6 turned off in my network settings. The Stunnel.conf looks like this: output = stunnel.log cert = stunnel.pem options = NO_SSLv2 [Verizon-pop3] client = yes accept = 11014 connect = pop.verizon.net:995 delay = yes [Verizon-smtp] client = yes accept = 11015 connect = smtp.verizon.net:465 delay = yes I do not have SSL turned on in my email client. The log from my email client looks like this: --- Tue, 11 Jun 2013 16:38:55 --- Connect to 'localhost' port 10115, timeout 60. 16:38:56.897 15: Peer connect failure (the host has refused the connection). The Verizon account is FIOS. I am not connected directly to the Verizon ISP. I can't send email without SSL. Does anyone have any idea how I can get this working? Thanks, Gary Kuznitz

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Certificate failure to verify with verify = 4 option
by Thomas Eifert 10 Jun '13

10 Jun '13

Correction: The cert issuer is Startcom Ltd, not Startcom LLC. -- Greetings; Stunnel 4.56 running under Win 7 SP1 x86. Recently, the owners of a server I regularly connect to updated their server certificate; the former had expired at the end of May. As soon as that event occurred, I deleted the old certificate, then used the "save peer certificate" function of Stunnel to get the updated one. However, the new certificate fails to verify, even with the verify = 4 option in Stunnel. The error message is similar to what I used to get when doing a verify = 3 with some certificates. The general error output of Stunnel is: CERT: Verification error: unable to get local issuer certificate 2013.06.09 16:37:46 LOG4[608:2336]: Certificate check failed: depth=0 When I open the new certificate with: openssl x509 -text -in certname.pem and view the certificate details, I'm not seeing anything obvious. The certificate is within a valid date range, and contains the same basic elements as other certs I've viewed. The certificate appears to have been issued by Startcom LLC. If I comment out the verify statement, I'm able to successfully negotiate an SSL connection with the server. I realize that this may be more of an openssl issue than an issue with Stunnel. Nevertheless, I thought I'd start here and throw it out to the floor for comments. Anyone have any ideas or have run into this issue? Regards, Thomas -- Attention: This message and all attachments are private and may contain information that is confidential and privileged. If you received this message in error, please notify the sender by reply email and delete the message immediately. _______________________________________________ stunnel-users mailing list stunnel-users(a)stunnel.org https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users

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weird stunnel problem
by Stephen Griffin 03 Jun '13

03 Jun '13

Hello A few days ago we ran into issue where the number of stunnel threads sky rocketed to over 3000 open stunnel threads. When this happen connections to our website slowed down considerably or failed to connect. It was resolved by flipping to our other proxy which accepted any new connections. It took about 5 minutes for the threads to die off on the other proxy. I was wondering if anyone has come across this problem? Here are some details of our stunnel version and config. Stunnel 4.44 with patch for x-forwarder [root@brm-proxy01 ~]# stunnel -version stunnel 4.44 on x86_64-unknown-linux-gnu platform Compiled/running with OpenSSL 1.0.0-fips 29 Mar 2010 Threading:PTHREAD SSL:ENGINE Auth:LIBWRAP Sockets:POLL,IPv6 Global options: debug = daemon.notice pid = /var/run/stunnel.pid RNDbytes = 64 RNDfile = /dev/urandom RNDoverwrite = yes Service-level options: ciphers = ALL:!SSLv2:!aNULL:!EXP:!LOW:-MEDIUM:RC4:+HIGH curve = prime256v1 session = 300 seconds sslVersion = TLSv1 for client, all for server stack = 65536 bytes TIMEOUTbusy = 300 seconds TIMEOUTclose = 60 seconds TIMEOUTconnect = 10 seconds TIMEOUTidle = 43200 seconds verify = none appriacated Our stunnel.conf. /etc/stunnel/stunnel.conf #sslVersion = TLSv1 pid = /var/run/stunnel.pid syslog = yes output = /var/log/stunnel.log debug = 3 [https] cert = /etc/stunnel/ssl/wildcard.blah.com.pem accept = 443 connect = 80 xforwardedfor = yes TIMEOUTbusy = 300 TIMEOUTclose = 0 TIMEOUTconnect = 10 TIMEOUTidle = 60 Is there anything we could add for performance tuning in stunnel? Any suggestions on what I could look for when this happens again would be appreciated. Our platform does between 2000 to 3000 rpm (request per minute) during peak hours. We constantly see a lot of these messages every hour but I am not sure what is happening as the connections seem to be working. SSL_accept: Peer suddenly disconnected There was a higher spike of them as per the normal rate during our incident described above. Thanks Stephen Griffin Sr. System Administrator www.achievers.com<http://www.achievers.com/> Confidentiality: The information contained in this e-mail and any attachments are confidential. If you are not the intended recipient, you may not copy or distribute this information. If you have received this communication in error, please notify the sender immediately and delete it from your system.

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x-forwarded-for.patch for stunnel 4.55/4.56
by Shannon Carver 17 May '13

17 May '13

Hi all, Just wondering if anyone know's a an xforwardedfor patch available for the latest versions of stunnel? Thanks Shannon Carver

2 1

Strange Stunnel crash (no errors, issues, anything)
by Alfred Kernaghan 17 May '13

17 May '13

Hi, Long time lurker, new poster though! I've got two servers running Stunnel v2.54 (yet to upgrade as I've been waiting for an x-forwardfor patch to become available). I noticed recently that one Stunnel nodes had exited, requiring a restart. I'm not sure if it's a co-incidence, but I've only just changed the cert on both installs last night. This, of course, is very concerning as it's only just become a problem, but being the core SSL endpoint, it knocks our server offline until it's restarted. Now comes the interesting bit, I've run the SSL Labs SSL Health check at https://www.ssllabs.com/ssltest/ just to see if anything comes out of it, and noticed that without fail every time it runs (and the first server is online) it'll know Stunnel offline as it goes through it's tests: *"Testing TLS v1.0...." "Testing TLS v1.2...."* *-- SERVER OFFLINE --* This was noticed by a fluke, but appears to happen every time I restart and then rerun the test. I'm not getting any segfaults, or errors from stunnel, and it only affects the one (primary) server. Can anyone shed any light as to what might be causing it, how I can get any more info out of stunnel, or better yet, fix it completely? Thanks all Alfie

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Error with stunnel 4.56 on Ubuntu 12
by Laura Fried 12 May '13

12 May '13

I am getting a success with doing the configure, make and make install. However when I go to start up stunnel I get the following error message: Clients allowed=500 stunnel 4.56 on x86_64-unknown-linux-gnu platform Compiled/running with OpenSSL 1.0.1 14 Mar 2012 Threading:PTHREAD Sockets:POLL,IPv6 SSL:ENGINE,OCSP,FIPS Reading configuration from file /usr/local/etc/stunnel/stunnel.conf FIPS_mode_set: F06D065: error:0F06D065:common libcrypto routines:FIPS_mode_set:fips mode not supported Line 51: "[pop3s]": Failed to initialize SSL str_stats: 9 block(s), 163 data byte(s), 522 control byte(s) Any assistance would be greatly appreciated. -- Laura J. Fried

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4.53 32-bit on Windows 2k8 R2 64bit
by Michael Curran 01 May '13

01 May '13

We are running stunnel and noticed an issue with what ended up being an issue creating a new thread due to running out of memory at 2gb - error (8) on create_client Are there any known issues with 4.53 around memory usage? We only terminate 2 ports against the installation 443 on 2 different interfaces / IP addresses and we ran into this issue with just under 5000 total connections We are not doing ECDH , but are using a 1024-bit param file

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Problem with roundrobbin failover mode?
by Matt Wise 01 May '13

01 May '13

I've got dozens of clients connecting with Stunnel to a group of 5 servers. Each system has a config that looks like this: > cert = /etc/stunnel/zookeeper.pem > key = /etc/stunnel/zookeeper.key > CAfile = /etc/stunnel/zookeeper_ca.pem > verify = 2 > delay = yes > sslVersion = TLSv1 > client = yes > setuid = stunnel4 > setgid = stunnel4 > pid = /var/lib/stunnel4/zookeeper.stunnel4.pid > socket = l:TCP_NODELAY=1 > socket = r:TCP_NODELAY=1 > TIMEOUTconnect = 2 > session = 86400 > debug = 5 > [zookeeper] > accept = 127.0.0.1:2182 > failover = rr > connect = prod-zookeeper:2182 > connect = prod-zookeeper-1:2182 > connect = prod-zookeeper-2:2182 > connect = prod-zookeeper-3:2182 > connect = prod-zookeeper-4:2182 > connect = prod-zookeeper-5:2182 Essentially the first host is a load balancer, and the next 5 are the actual zookeeper hosts so that we can bypass the ELB if its giving us fits. Now what we're seeing is that almost every connection ends up on prod-zookeeper-5. Over and over and over again, our hosts pick the same system each time. We're running Stunnel 4.52: > Clients allowed=8000 > stunnel 4.52 on i486-pc-linux-gnu platform > Compiled/running with OpenSSL 0.9.8k 25 Mar 2009 > Threading:PTHREAD SSL:ENGINE Auth:LIBWRAP Sockets:POLL,IPv6 Any ideas what might be wrong here? Obviously we want the connections to be *roughly* random across the list of hosts... and if one of the hosts goes down, and the connection fails, we want the stunnel service to try again, and randomly pick a new host. It doesn't really seem to be doing that though. --Matt

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help on Linux stunnel setup
by Valerio.FABRIZIO＠sungard.com 26 Apr '13

26 Apr '13

Hello all! I'm in charge of activating stunnel to connect a service to a remote service. Since I'm totally new on this product, I'd be grateful if someone could help me in configuring. This is where I stand: Stunnel version: stunnel 4.29 on x86_64-unknown-linux-gnu with OpenSSL 1.0.0-fips 29 Mar 2010 OS: Linux 2.6.32-220.23.1.el6.x86_64 #1 SMP Mon Jun 18 18:58:52 BST 2012 x86_64 x86_64 x86_64 GNU/Linux I'd need to have it started by non-root user, and I have loaded under a specific path (owned by the same user): Stunnel.conf: ; Sample stunnel configuration file ;cert = FXMS1.pem client = yes output = /export/home/bg_mtsbv/slev5fix/log pid = /export/home/bg_mtsbv/slev5fix/conf/stunnel.pid [ssl01] accept = 127.0.0.1:18889 connect = 193.203.229.143:443 Stunnel.pid (empty) xxx.pem (certificate has been provided by the owner of the target server) my first two questions: which is the correct command line to be launched? Is it correct to have all the files under the user's directory? Many thanks in advance for your help! Regards, Valerio

1 0

Inconsistent performance across stunnel and/or OpenSSL versions
by PPingPongBaker PPingPongBaker 23 Apr '13

23 Apr '13

Hi All, I am experimenting with stunnel inside a VM on Xenserver 6.02. So this may not be a "common" use case, nonetheless, I would like to point out the issue. It is a basic setup as follows with 3 VMs running "ab" for webclient, stunnel+haproxy combo as the https/http bridge and nginx as the webserver. client VM (ab) <-> stunnel + haproxy VM <-> webserver VM (nginx) Specs on the stunnel VM are 2GB RAM, single-core dedicated 2.5 GHz Xeon E5-2640 vCPU, running Debian Squeeze 2.6.32-5-amd64 (64 bit) kernel. All things unchanged such as stunnel/haproxy/nginx config and taking care of common gotchas such as file descriptor limit, TIMEOUTclose, disabling libwrap, etc. stunnel is built with pthreads. Also stunnel is configured to use a 2K RSA self-signed certificate, and the client is being forced to do TLS1. "ab" is invoked with "-c 4" so as to peg the stunnel VM CPU (any value beyond 4 doesn't seem to matter). nginx serves a tiny 32 byte static html file. With stunnel 4.29 and OpenSSL 0.9.8o, I get 300 requests per second as max throughput. With stunnel 4.56 and OpenSSL 1.0.1e, I get only 40 requests per second as max throughput. tcpdump tells me that the Server Hello sent to the client takes a longer time in the latter case. Tinkering with TCP_NODELAY doesn't change anything. Anyone else seeing this maybe even on physical hardware? Has anything changed in OpenSSL across those versions? Suggestions? Thanks.

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