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3315 discussions

How to configure stunnel client on Mac
by Mark Foley 04 May '18

04 May '18

I've successfully set up stunnel for Windows and Linux clients. Now to set up for Mac. I've gone to the website http://macappstore.org/stunnel/ and followed the instructions there which are: 1. Press Command+Space and type Terminal and press enter/return key. 2. Run in Terminal app: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)" < /dev/null 2> /dev/null and press enter/return key. 3. Run: brew install stunnel And then it says, "Done! You can now use stunnel." Well, not exactly. Where do I put my stunnel.conf and certificate.pem? How do I make stunnel run automatically at boot time? The web instructions aren't very complete. Need additional assistance. THX --Mark

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Stunnel in Windows Failover cluster
by Tobias Gillstöm 27 Apr '18

27 Apr '18

Hi, I'm currently using stunnel in a windows fail over cluster: My problem is that when a fail over occurs stunnel switches too the other node and says that stunnel is running and everything is fine. But when I check the logs for stunnel and the program that uses stunnel, it does not appear to be running or sending any data. In the screenshot you can see my stunnel configuration, in the startup parameters section it says "-service -install" my question is if it shouldn't say "-service -start" instead, has anyone else encountered this problem? And if this is the problem why does the stunnel service install with these parameters?

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Ubuntu 16.04.4 LTS SSLv3 and SSlv2 running stunnel 5.44
by Joe Phillips 25 Apr '18

25 Apr '18

I am running stunnel 5.44 on Ubuntu 16.04.4 LTS with all updates. I cannot get devices to connect using sslv2 or 3. My conf file Options line as seen below : ;Enable support for inecure SSLv3 protocol Options = -NO_SSLv3 Options = -NO_SSLv2 I continuously get error 1408A10B SSL routines: ssl3_get_client_hello:wrong version number Do I not have SSL3 and 2 correctly defined in my conf file? I realize 2 and 3 are no longer secure, but I need to support them while I transition to TLS 1.2 thanks [cid:image001.png@01D3DC17.D1AFBC30]

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stunnel as a Windows Service
by Paul Muller 20 Apr '18

20 Apr '18

Does anyone have any documentation on how to setup stunnel as a Windows Service? I currently have it installed on a Windows Server 2012 R2 Standard. I noticed that stunnel stops running as soon as I log off of my RDP session on the server. [logo1] Paul A. Muller * Systems and Networking Consultant Earnest & Associates * Profitability Improvement Specialists Voice: 305.822.5353 x354 * Fax: 305.822.5848 Email: paul.muller(a)earnestassoc.com<mailto:paul.muller@earnestassoc.com> * Web: earnestassoc.com<http://www.earnestassoc.com/> * Twitter: @earnestassoc<http://twitter.com/earnestassoc>

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Rapid subsequent DNS resolution fails within stunnel
by Vincent Deschenes 20 Apr '18

20 Apr '18

Hi, We have had this weird problem for a long time where sometime DNS resolution will fail with this error: Error resolving 'domain name printed here': Neither nodename nor servname known (EAI_NONAME) Today I found out that this will happen when stunnel get 2 calls for the same outgoing endpoint very fast one after the other. One call will work no problem. But if you do 2 one after the other then the second one and all other subsequent will fail. Wait a bit and try again, the first one will pass and then others will fail. DNS resolution on the server (linux) itself work without problem, nslookup in loops no problem. But with stunnel we always have the problem. The only working solution is to add a record to the server host file. Any idea ? Could this be a bug in stunnel ? Thanks, Vincent

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Authentication
by Paul Muller 20 Apr '18

20 Apr '18

When I first setup stunnel, I changed my software to reflect the [gmail-smtp] entries in my configuration file. When I tried to send an email from my application I received the following message: "No Email sent, Error 535-5.7.8 Username and Password not accepted." Then I remarked out the authentication credentials in my software. When I tried to send an email I received the following message: "No Email sent, Error-5.5.1 Authentication Required." My question is, can place my authentication credentials in the "stunnel.conf" file? And if so, where? Thanks, [logo1] Paul A. Muller * Systems and Networking Consultant Earnest & Associates * Profitability Improvement Specialists Voice: 305.822.5353 x354 * Fax: 305.822.5848 Email: paul.muller(a)earnestassoc.com<mailto:paul.muller@earnestassoc.com> * Web: earnestassoc.com<http://www.earnestassoc.com/> * Twitter: @earnestassoc<http://twitter.com/earnestassoc>

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/etc/hosts setting
by White Little 17 Apr '18

17 Apr '18

Hi All I found a interesting issue with /etc/hosts setting in different Linux system. My stunnel.conf setting like below [HOST] cert = client.crt key = client.key CAfile = server.crt client = yes accept = 10.160.160.88:57853 connect = 10.136.160.21:3520 I would like to connect server 10.136.160.21:3520 via stunnel 10.160.160.88:57853 Part A If my hostname and /etc/hosts setting in different System as followings all will works well 1. CentOS 7 32bit $hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin 2. Redhat 7 64bit $hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin 3. Ubuntu15.10 64bit $hostname virtual-machine $ cat /etc/hosts 127.0.0.1 localhost 10.136.160.88 virtual-machine Part B. If the "127.0.0.1" include the hostname in /etc/hosts, both CentOS and Fedora will fail, but Ubuntu still work 1. CentOS 7 32bit $hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost* localhost.localdomain* localhost4 localhost4.localdomain4 10.136.160.253 localhost.localdomain 2. Redhat 7 64bit $hostname localhost.localdomain $ cat /etc/hosts 127.0.0.1 localhost *localhost.localdomain* localhost4 localhost4.localdomain4 10.136.160.88 localhost.localadmin 3. Ubuntu15.10 64bit $hostname virtual-machine $ cat /etc/hosts 127.0.0.1 localhost *virtual-machine* 10.136.160.88 virtual-machine I think it maybe not a stunnel issue, but I'd like to know why it has different behavior Thanks Jay

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make_test failing
by Ian Bamforth 16 Apr '18

16 Apr '18

Morning, Our CI has been failing since Friday with the same errors seen at https://tests.reproducible-builds.org/debian/rb-pkg/unstable/amd64/stunnel4…. make_test fails on 012_verify_chain and 013_CRL_file. Anyone else seeing the same thing? We run Ubuntu 14.04, stunnel v5.44, automatically applying apt security patches to the OS. My initial assumption is that some dependency of stunnel has been updated, but I've not had chance to find out. We have been using the same version of stunnel since the day it was released without any other problems. Ian

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Invalid certificate in tests, prevents make_test from running
by Ian Bamforth 16 Apr '18

16 Apr '18

Morning, I posted earlier about `make_test` failing, apologies for not replying to that thread but I didn't receive the email myself. I've tracked this down to `tests/certs/CACert.pem` containing an expired certificate - see below output: openssl x509 -in tests/certs/CACert.pem -text -noout Certificate: Data: Version: 3 (0x2) Serial Number: 1 (0x1) Signature Algorithm: sha1WithRSAEncryption Issuer: C=pl, O=CA_cert, OU=CA_cert, CN=CA_cert/emailAddress=CA_cert(a)example.com Validity Not Before: Apr 26 18:41:00 2017 GMT Not After : Apr 13 15:45:00 2018 GMT Subject: C=pl, O=CA_cert, OU=CA_cert, CN=CA_cert/emailAddress=CA_cert(a)example.com Subject Public Key Info: Public Key Algorithm: rsaEncryption Public-Key: (2048 bit) Modulus: 00:af:cc:61:f5:73:2b:49:3c:62:c0:b0:d6:1b:0f: 5e:32:d1:49:48:01:b2:35:36:a8:04:a3:e0:7e:e4: 1d:f9:cb:fe:11:0a:c3:2e:b1:3e:87:4c:b0:72:d7: 73:04:ba:28:c7:2b:b4:67:13:0e:5d:05:7f:67:bd: ba:7f:c5:89:b0:48:d6:21:4b:e8:3a:70:ac:dc:e4: f5:43:c3:c9:57:7f:73:f1:3b:b0:e5:a5:90:44:9f: 6e:c3:2a:f5:ab:e6:15:f3:de:cd:44:23:5e:4f:c2: eb:44:59:6c:f5:76:46:b0:7c:fc:59:df:20:97:0c: 0f:43:ae:df:47:f6:d2:78:fd:c6:be:11:cf:26:a1: 8d:87:74:2f:c9:b5:1b:2b:9d:a4:95:44:0c:54:de: 0c:12:d4:8d:14:57:31:a7:a8:70:11:68:6e:20:3d: 76:c9:c8:45:50:d5:4e:2f:f1:6e:78:25:23:05:45: 6e:7d:11:2a:b3:e8:88:6e:68:29:2c:a2:c2:3d:cf: 41:50:b5:e1:51:8f:8e:f4:36:0f:f5:a8:63:5e:29: 1d:b4:fe:71:43:d0:2a:be:2a:2c:b1:62:c6:b9:bc: 4d:95:80:4e:60:ec:e9:79:92:19:31:9c:b2:00:74: 3b:a1:80:57:b4:22:45:c8:d3:1a:a7:4f:f6:00:12: 35:b7 Exponent: 65537 (0x10001) X509v3 extensions: X509v3 Basic Constraints: CA:TRUE Signature Algorithm: sha1WithRSAEncryption 97:03:b2:c1:a2:44:8a:2a:9c:1d:3c:cb:61:a6:f9:bc:7f:4f: 21:fc:69:d8:f3:31:7b:4b:e5:2b:34:42:19:03:1a:40:af:fa: 7e:18:93:99:a8:78:cb:32:15:23:75:6e:49:6d:ac:ee:ca:5e: d6:d2:69:5a:b5:4a:13:cd:7c:77:e4:f2:6d:a0:2d:63:2f:62: b5:be:24:ee:12:d7:22:3e:dd:d2:56:07:81:ca:c4:cf:4c:2c: 36:64:32:52:b1:76:76:5f:c7:45:86:b9:34:1a:c7:37:0c:38: ce:8b:20:8b:70:a1:33:a0:e1:3d:ed:9a:26:c0:04:e7:35:c5: 41:ab:bd:f9:cc:10:8d:12:3f:7a:ee:b3:a3:98:35:09:b2:e5: 5f:aa:22:16:7e:18:df:61:ac:3d:30:48:f7:77:41:5c:25:bd: 6f:dc:53:d0:f3:d7:cc:33:f6:77:36:99:0b:e4:8f:3e:83:e4: ca:3a:58:6f:73:55:83:6e:a7:01:b2:21:bf:09:54:28:e3:e0: a5:4f:bd:d7:66:a2:f8:c2:81:6f:0d:aa:ba:6f:7d:a9:cf:6f: 06:a8:a2:b1:5b:3b:f9:7b:89:bf:f5:c4:ed:f0:5e:cf:64:87: 39:84:90:6c:c9:e0:5d:b4:54:ae:a7:6c:e7:b4:2a:29:fe:ab: 62:4f:91:d0 As a (horrible) workaround I've had to skip "make_test" in my CI - if there are any better ideas please let me know! Ian

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Possible memory leak with stunnel reload
by Mark Brookes 06 Apr '18

06 Apr '18

Hi all, we have noticed that when reloading (note reloading not restarting) stunnel it appears to be leaking between 12 and 32 bytes of memory (ish) per reload. There does not need to be any traffic passing through it at the time to view this problem. If its reloaded enough times the system will eventually run out of memory. Unless an stunnel restart if performed inbetween. We are running 5.41 tried with the latest 5.44 and have the same result. We are using openssl 1.0.2j-fips ive tried with 1.0.2n and 1.1.0e (to try and rule out openssl) We are reloading by running: kill -s HUP <pid> The stunnel configuration is - pid = /var/run/stunnel/stunnel.pid debug = 7 syslog = no output = /var/log/stunnel.log socket = a:IP_FREEBIND=yes fips = no sslVersion = all [VIP_Name] cert = /etc/loadbalancer.org/certs/server.pem ciphers = ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DHE-RSA-AES256-SHA256:!RC4:!MD5:!aNULL:!EDH:!3DES accept = 192.168.80.16:443 connect = 127.0.0.5:80 delay = yes options = NO_SSLv3 options = NO_TLSv1 options = DONT_INSERT_EMPTY_FRAGMENTS renegotiation = no local = 192.168.80.16 TIMEOUTclose = 0 The stunnel log file is as follows - 2018.04.03 11:09:59 LOG7[ui]: Clients allowed=62937 2018.04.03 11:09:59 LOG5[ui]: stunnel 5.44 on x86_64-pc-linux-gnu platform 2018.04.03 11:09:59 LOG5[ui]: Compiled/running with OpenSSL 1.0.2j-fips 26 Sep 2016 2018.04.03 11:09:59 LOG5[ui]: Threading:PTHREAD Sockets:POLL,IPv6 TLS:ENGINE,FIPS,OCSP,PSK,SNI 2018.04.03 11:09:59 LOG7[ui]: errno: (*__errno_location ()) 2018.04.03 11:09:59 LOG5[ui]: Reading configuration from file /etc/stunnel/stunnel.conf 2018.04.03 11:09:59 LOG5[ui]: UTF-8 byte order mark not detected 2018.04.03 11:09:59 LOG5[ui]: FIPS mode disabled 2018.04.03 11:09:59 LOG7[ui]: Compression disabled 2018.04.03 11:09:59 LOG7[ui]: Snagged 64 random bytes from /dev/urandom 2018.04.03 11:09:59 LOG7[ui]: PRNG seeded successfully 2018.04.03 11:09:59 LOG6[ui]: Initializing service [VIP_Name] 2018.04.03 11:09:59 LOG7[ui]: Ciphers: ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DHE-RSA-AES256-SHA256:!RC4:!MD5:!aNULL:!EDH:!3DES 2018.04.03 11:09:59 LOG7[ui]: TLS options: 0x07004804 (+0x07004800, -0x00000000) 2018.04.03 11:09:59 LOG6[ui]: Loading certificate from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:09:59 LOG6[ui]: Certificate loaded from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:09:59 LOG6[ui]: Loading private key from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:09:59 LOG6[ui]: Private key loaded from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:09:59 LOG7[ui]: Private key check succeeded 2018.04.03 11:09:59 LOG7[ui]: ECDH initialization 2018.04.03 11:09:59 LOG7[ui]: ECDH initialized with curve prime256v1 2018.04.03 11:09:59 LOG5[ui]: Configuration successful 2018.04.03 11:09:59 LOG7[ui]: Binding service [VIP_Name] 2018.04.03 11:09:59 LOG7[ui]: Listening file descriptor created (FD=6) 2018.04.03 11:09:59 LOG7[ui]: Option SO_REUSEADDR set on accept socket 2018.04.03 11:09:59 LOG7[ui]: Option IP_FREEBIND set on accept socket 2018.04.03 11:09:59 LOG7[ui]: Service [VIP_Name] (FD=6) bound to 192.168.80.16:443 2018.04.03 11:09:59 LOG7[main]: Created pid file /var/run/stunnel/stunnel.pid 2018.04.03 11:09:59 LOG7[cron]: Cron thread initialized 2018.04.03 11:10:59 LOG6[cron]: Executing cron jobs 2018.04.03 11:10:59 LOG6[cron]: Cron jobs completed in 0 seconds 2018.04.03 11:10:59 LOG7[cron]: Waiting 86400 seconds 2018.04.03 11:11:08 LOG7[main]: Found 1 ready file descriptor(s) 2018.04.03 11:11:08 LOG7[main]: FD=4 events=0x2001 revents=0x1 2018.04.03 11:11:08 LOG7[main]: FD=6 events=0x2001 revents=0x0 2018.04.03 11:11:08 LOG7[main]: Dispatching signals from the signal pipe 2018.04.03 11:11:08 LOG7[main]: Processing SIGNAL_RELOAD_CONFIG 2018.04.03 11:11:08 LOG5[main]: Reading configuration from file /etc/stunnel/stunnel.conf 2018.04.03 11:11:08 LOG5[main]: UTF-8 byte order mark not detected 2018.04.03 11:11:08 LOG5[main]: FIPS mode disabled 2018.04.03 11:11:08 LOG7[main]: Compression disabled 2018.04.03 11:11:08 LOG7[main]: Snagged 64 random bytes from /dev/urandom 2018.04.03 11:11:08 LOG7[main]: PRNG seeded successfully 2018.04.03 11:11:08 LOG6[main]: Initializing service [VIP_Name] 2018.04.03 11:11:08 LOG7[main]: Ciphers: ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:DHE-RSA-AES256-SHA256:!RC4:!MD5:!aNULL:!EDH:!3DES 2018.04.03 11:11:08 LOG7[main]: TLS options: 0x07004804 (+0x07004800, -0x00000000) 2018.04.03 11:11:08 LOG6[main]: Loading certificate from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:11:08 LOG6[main]: Certificate loaded from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:11:08 LOG6[main]: Loading private key from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:11:08 LOG6[main]: Private key loaded from file: /etc/ loadbalancer.org/certs/server.pem 2018.04.03 11:11:08 LOG7[main]: Private key check succeeded 2018.04.03 11:11:08 LOG7[main]: ECDH initialization 2018.04.03 11:11:08 LOG7[main]: ECDH initialized with curve prime256v1 2018.04.03 11:11:08 LOG5[main]: Configuration successful 2018.04.03 11:11:08 LOG7[main]: Unbinding service [VIP_Name] 2018.04.03 11:11:08 LOG7[main]: Service [VIP_Name] closed (FD=6) 2018.04.03 11:11:08 LOG7[main]: Service [VIP_Name] closed 2018.04.03 11:11:08 LOG7[main]: Binding service [VIP_Name] 2018.04.03 11:11:08 LOG7[main]: Listening file descriptor created (FD=6) 2018.04.03 11:11:08 LOG7[main]: Option SO_REUSEADDR set on accept socket 2018.04.03 11:11:08 LOG7[main]: Option IP_FREEBIND set on accept socket 2018.04.03 11:11:08 LOG7[main]: Service [VIP_Name] (FD=6) bound to 192.168.80.16:443 2018.04.03 11:11:08 LOG7[main]: Signal pipe is empty Any help would be appreciated. Thanks -- Mark Brookes Loadbalancer.org Ltd. www.loadbalancer.org +44 (0)330 380 1064 mark(a)loadbalancer.org

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