stunnel-users

3 participants
3308 discussions

Possible Mail Relay (port 465/tcp-SSL) after stunnel install
by Sven Schulte 28 May '14

28 May '14

Dear colleagues, after installing stunnel (v 5.01) an PCI Security Scan finished with finding that port 465 allows mail relaying. (CVE-1999-0512, CVE-2002-1278, CVE-2003-0285). Any comments/ideas how to comly? Thanks in advance! Sven

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Strange performance problem, need help troubleshooting
by Paulo Azevedo 24 May '14

24 May '14

I have a strange performance problem with stunnel, could you help me? Here is my setup: PC1 & PC2 -- Switch (GbE) -- Switch (100mbps) -- Router -- modem -- Internet PC1 has stunnel and HFS installed, sharing a folder to the internet.My internet upload speed is 20Mbps. With this setup, I can serve files at 8Mbps over the internet, but if I disable stunnel the speed doubles to 16Mbps. However, with stunnel active, if I try the same with PC2, I get 82Mbps (using the internet IP, it goes all the way to the router), so this does not appear to be a performance problem on the hardware. Can you give me some hints on what is limiting my speed here?

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[patch] Systemd socket activation support in daemon mode
by Mark Theunissen 14 May '14

14 May '14

Hi, This patch allows stunnel to be started in daemon mode by systemd's socket activation. This is superior to inetd mode, for all the reasons specified in the stunnel howto. Since systemd is now the default in most of the major Linux distros, it would be great to have this committed upstream. https://gist.github.com/marktheunissen/7ce9426e66aa8f0ec2e1 Example systemd unit files: ### stunnel.socket [Unit] Description=Stunnel socket After=network.target [Socket] ListenStream=9999 ### stunnel.service [Unit] Description=Stunnel service After=network.target [Service] Type=forking ExecStart=stunnel /etc/stunnel/stunnel.conf Thanks, Mark Theunissen

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Re: [stunnel-users] certificate verify failed
by Aaron Haywood 05 May '14

05 May '14

The following is an excerpt from my log's slightly modified to hide company specific data: 2014.05.01 10:11:05 LOG7[5956]: Starting certificate verification: depth=2, subject=/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority 2014.05.01 10:11:05 LOG6[5956]: Certificate accepted: depth=2, subject=/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority 2014.05.01 10:11:05 LOG7[5956]: Starting certificate verification: depth=1, subject=/C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=######## 2014.05.01 10:11:05 LOG6[5956]: Certificate accepted: depth=1, subject=/C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=######## 2014.05.01 10:11:05 LOG7[5956]: Starting certificate verification: depth=0, subject=/O=*.somedomain.com/OU=Domain Control Validated/CN=*.somedomain.com 2014.05.01 10:11:05 LOG3[5956]: CERT: X509_STORE_get1_certs: Peer suddenly disconnected 2014.05.01 10:11:05 LOG4[5956]: Certificate check failed: depth=0, subject=/O=*.somedomain.com/OU=Domain Control Validated/CN=*.somedomain.com 2014.05.01 10:11:05 LOG7[5956]: SSL alert (write): fatal: certificate unknown Respectfully, Aaron Haywood | Systems Administrator [cid:[email protected]] O: 858.614.1547 | M: 858.699.8302 | www.sdhealthconnect.org CONNECT WITH US: Facebook<https://www.facebook.com/SDHealthConnect?filter=1> | Twitter<https://twitter.com/SDHealthConnect> | LinkedIn<http://www.linkedin.com/company/san-diego-health-connect?trk=company_logo> | Google+<https://plus.google.com/u/0/b/112077458420951237937/112077458420951237937/p…> | YouTube<http://www.youtube.com/SDHealthConnect>

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Re: [stunnel-users] certificate verify failed
by Aaron Haywood 05 May '14

05 May '14

Roman, I was wondering if you changed your verify from level 3 to level 2, and if this resolved your peer disconnection error with stunnel. We're experiencing a similar problem but was wondering if anyone out there has resolved this issue already; and if so..how? :) Respectfully, Aaron Haywood | Systems Administrator [cid:[email protected]] O: 858.614.1547 | M: 858.699.8302 | www.sdhealthconnect.org CONNECT WITH US: Facebook<https://www.facebook.com/SDHealthConnect?filter=1> | Twitter<https://twitter.com/SDHealthConnect> | LinkedIn<http://www.linkedin.com/company/san-diego-health-connect?trk=company_logo> | Google+<https://plus.google.com/u/0/b/112077458420951237937/112077458420951237937/p…> | YouTube<http://www.youtube.com/SDHealthConnect>

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New stunnel how-to
by Patrick J. 30 Apr '14

30 Apr '14

Hi all, I've spent some time to write a new stunnel how-to. - Install and configure stunnel on a Raspberry Pi - Run stunnel in a chroot jail - Limit allowed ciphers and force Forward Secrecy - Restrict access to the stunnel server (verify = 3) - Disguise SSH as HTTPS traffic http://stunnel.qnea.net/ Regards from Germany, Patrick

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Error 126 compiling on Mac OS X 10.7.5
by James Brown 28 Apr '14

28 Apr '14

I’ve just tried to install version 5.01 and encountered an error. I had no problems installing 5.01b1 previously. I just thought I’d install the release version. System is running Mac OS X 10.7.5. make ends with a warning, and make install fails: ld: warning: directory not found for option '-L/usr//lib64' Making all in doc make[1]: Nothing to be done for `all'. Making all in tools make[1]: Nothing to be done for `all'. make[1]: Nothing to be done for `all-am'. mail:stunnel-5.01 2 jlbrown$ sudo make install Password: Making install in src ../auto/install-sh -c -d '/usr/local/bin' /bin/sh ../libtool --mode=install /usr/bin/install -c stunnel '/usr/local/bin' libtool: install: /usr/bin/install -c stunnel /usr/local/bin/stunnel ../auto/install-sh -c -d '/usr/local/bin' /usr/bin/install -c stunnel3 '/usr/local/bin' ../auto/install-sh -c -d '/usr/local/lib/stunnel' /bin/sh ../libtool --mode=install /usr/bin/install -c libstunnel.la '/usr/local/lib/stunnel' libtool: install: /usr/bin/install -c .libs/libstunnel.dylib /usr/local/lib/stunnel/libstunnel.dylib libtool: install: /usr/bin/install -c .libs/libstunnel.lai /usr/local/lib/stunnel/libstunnel.la /Users/jlbrown/Downloads/stunnel-5.01: /Users/jlbrown/Downloads/stunnel-5.01: is a directory make[2]: *** [install-pkglibLTLIBRARIES] Error 126 make[1]: *** [install-am] Error 2 make: *** [install-recursive] Error 1 I just used ./configure with no arguments. Any suggestions? Thanks, James.

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Verify=2 and Verification Depth...
by Matt Wise 28 Apr '14

28 Apr '14

It was my understanding that when you have an Stunnel Server configured with 'verify=2', that the client that connects must have a certificate signed by the same CA/SubCA combination that the server does. So for example: - My_Root_Ca (private CA) - Some_Random_Cert.pem - Stunnel_Sub_Ca: - Server.pem - Client.pem - Postgres_Sub_Ca: - Server.pem - postgres_user.pem With the above structure in place (and the stunnel server using Stunnel_Sub_Ca/Server.pem) if someone tried to connect in with the Stunnel_Sub_Ca/Client.pem cert, it would work... but if they tried to connect in with Postgres_Sub_Ca/Server.pem, it wouldn't. Unfortunately we're not seeing that behavior... we're seeing a behavior where *every* cert signed by the overall Root CA is validated. We're able to connect in using Some_Random_Cert.pem, Postgres_Sub_Ca/Server.pem and Postgres_Sub_Ca/postgres_user.pem. This feels wrong ... what am I missing? (We're using Stunnel 4.55 btw) Matt Wise Sr. Systems Architect Nextdoor.com

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ephemeral port limit
by Frank Liu 28 Apr '14

28 Apr '14

Hi, I am trying to use stunnel to add ssl support to my app. My app and linux server are tuned to accept 200k+ connections without a problem. When adding stunnel on the same server, the connection stops when it reaches 64k due to stunnel uses ephemeral ports to connect to my app on the localhost. Any suggestions how to get around this limit? One thing I am thinking of is to add 10 virtual interfaces on loopback: lo0:2, lo0:3, etc with ip 127.0.0.2, 127.0.0.3 etc. Can stunnel be configured to cycle through a pool of ip for outbound connection to my app listening on 127.0.0.1? That would give 10x64k of ephemeral ports. I see stunnel has "local" to specify outgoing ip, but I am not sure if it supports a list of ip or use multiple times. If so, will it round robin the list? Thanks Frank

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Syringe
by Michal Trojnara 21 Apr '14

21 Apr '14

Hi Guys, I'm glad to announce syringe, a service for testing client-side heartbleed. It allows to easily examine most of the obscure TLS clients (for example embedded devices). The service is available online at https://www.stunnel.org:4433/ Best regards, Mike

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