stunnel-users

3311 discussions

SOLVED, I cannot get Outlook Express email to work after Cox changes
by David Yunker 22 Jun '19

22 Jun '19

To anybody interested, Here is how to configure Stunnel for Outlook Express v6 in Windows XP to work: Modify Stunnel configuration to this: [cox-pop3] client = yes accept = 127.0.0.1:110 connect = pop.cox.net:995 CAfile = ca-certs.perm OCSPaia = yes [cox-smtp] client = yes accept = 127.0.0.1:25 connect = smtp.cox.net:587 CAfile = ca-certs.perm OCSPaia = yes Now configure Outlook Express as follows: Set incoming mail(POP3) to 127.0.0.1 Set outgoing mail(SMTP) to 127.0.0.1 Have "Logon using secure password authentication" unchecked. Have "My server requires authentication" unchecked For POP3 set incoming mail (POP3) to port 110. For SMTP set outgoing mail (SMTP) to port 25. Have "This server requires a secure connection(SSL)" for POP3 unchecked. Have "This server requires a secure connection(SSL)" for SMTP unchecked. Everything works except I have the following error message in the Stunnel log: "Service [service name] needs authentication to prevent MITM attacks" Does anybody know how to prevent this from happening? I tried having the "My server requires authentication" checked but I still have the message when Stunnel starts. Thank you for any help.

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Help, I cannot get Outlook Express email to work after Cox changes
by David Yunker 21 Jun '19

21 Jun '19

To anybody who can help, I am currently using Stunnel version 5.24. I cannot update it to the latest version because I am using it on a Windows XP system. My problem is that I am currently using COX for my internet provider and COX recently change the email protocol from SSL to TSL. This is a problem since I am currently using Outlook Express v6 and it does not work with TSL. I recently discovered your Stunnel program and believe it will solve my problem. I tried changing the items in the configuration file to the following: fips = yes [cox-pop3] client = yes accept = 127.0.0.1:995 connect = pop.cox.net:995 verify = 2 CAfile = ca-certs.pem checkHost = pop.cox.net OCSPaia = yes Stunnel shows no errors but my email still does not work. This is what happens when setting up the configuration for Outlook express: My POP account is pop.cox.net. My SMTP account is smtp.cox.net. If I set the POP port to 110 and leave the SMTP port to 25 and I have checked "logon using secure password authentication". But I do NOT have checked "this server requires a secure connection (SSL)". Then when I attempt to send/receive I get the following error: "Unable to logon to the server using secure password authentication account 'pop.cox.net server ...." If I do check "this server requires a secure connection (SSL)" and leave the POP port to 110 then when I attempt to send/receive I get the following error: "Your server has unexpectedly terminated the connection ..." If I change the POP port from 110 to 995 and remove the check mark for "this server require a secure connection (SSL)". Then when I attempt to send/receive I get a time out condition. If I check "this server requires a secure connection (SSL)" and attempt a send/receive I get this error: "Your server has unexpectedly terminated the connection.." No matter how I configure my Outlook Express I do not receive any email. I have a friend who has a Windows 7 system and a virtual windows xp installed in it that he uses for his email but is using Outlook in windows xp and this same configuration works fine for him. Except he has to have "verify = 2" removed from the configuration for Stunnel and his SMTP port is 587. For it to work. What am I doing wrong? Please help!

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Re: [stunnel-users] stunnel client: accept on connect success
by Eric Eberhard 19 Jun '19

19 Jun '19

I'm a dummy so what I do is write a "wrapper" -- you connect to your wrapper and manage your problem. If all is good exec stunnel. If not send appropriate messages back. Dummy idea, Eric -----Original Message----- From: stunnel-users [mailto:[email protected]] On Behalf Of mihertz(a)gmx.de Sent: Tuesday, June 18, 2019 11:19 PM To: stunnel-users(a)stunnel.org Subject: [stunnel-users] stunnel client: accept on connect success Hi everyone, could use some help for a stunnel client-mode question. Found no corresponding config directives in the manpage, not sure i am searching with the correct terms... or going for the correct approach at all. So there is a scenario where the stunnel client plaintext side does the tcp-handshake (S/S./.) and directly terminates the connected client afterwards (R.). This is caused because the corresponding connect-target fails to establish a TCP/TLS connection with the server (rejected by target server for whatever reason). This could cause a first regular tcp-packet to be send and lost, before stunnel disconnects on the plaintext-side and the application becomes aware of that eventually. I wonder if there is a way to configure stunnel to behave in a similar way to haproxy /w acl? Where it denies all tcp connects unless at least 1 backend server is available. So that stunnel would like "delay" the accept-side TCP handshake while trying to connect to the connect-side via TLS. Based on TCP/TLS success/failure on the connect-side then continues the accept-side TCP handshake or quits its. This way the client would never have the short moment of "ok, i can start" I know that this behaviour is not optimal/desired with the majority of cases, just have the impression I have a use-case for this in my scenario. There is no way to modify the plaintext-side connected application in any way. Tx/Rx data is just a few bytes, so its always 1 packet for requests/answers. And relatively often that first packet sent goes out before the reset (R.) is received by the stunnel client-mode to the software connected on the accept-side. Would be happy for your input and ideas on how to work around that. Best Regards Michael _______________________________________________ stunnel-users mailing list stunnel-users(a)stunnel.org https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users

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stunnel client: accept on connect success
by mihertz＠gmx.de 19 Jun '19

19 Jun '19

Hi everyone, could use some help for a stunnel client-mode question. Found no corresponding config directives in the manpage, not sure i am searching with the correct terms... or going for the correct approach at all. So there is a scenario where the stunnel client plaintext side does the tcp-handshake (S/S./.) and directly terminates the connected client afterwards (R.). This is caused because the corresponding connect-target fails to establish a TCP/TLS connection with the server (rejected by target server for whatever reason). This could cause a first regular tcp-packet to be send and lost, before stunnel disconnects on the plaintext-side and the application becomes aware of that eventually. I wonder if there is a way to configure stunnel to behave in a similar way to haproxy /w acl? Where it denies all tcp connects unless at least 1 backend server is available. So that stunnel would like "delay" the accept-side TCP handshake while trying to connect to the connect-side via TLS. Based on TCP/TLS success/failure on the connect-side then continues the accept-side TCP handshake or quits its. This way the client would never have the short moment of "ok, i can start" I know that this behaviour is not optimal/desired with the majority of cases, just have the impression I have a use-case for this in my scenario. There is no way to modify the plaintext-side connected application in any way. Tx/Rx data is just a few bytes, so its always 1 packet for requests/answers. And relatively often that first packet sent goes out before the reset (R.) is received by the stunnel client-mode to the software connected on the accept-side. Would be happy for your input and ideas on how to work around that. Best Regards Michael

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Re: [stunnel-users] stunnel-users Digest, Vol 179, Issue 5
by Brent Kimberley 16 Jun '19

16 Jun '19

>> Is there something missing ? Can you please elaborate? https://www.stunnel.org/auth.html Subject: Using STunnel4 with both SSL/TLS proxy AND PSK authentication Hi, all. We've got a specific use case where we need to implement an stunnel4 'tunnel' in the following format: Client <---> client-side stunnel4 <---> server-side stunnel4 <---> server The specific case for this is because of a server that does NOT support SSL on the remote side nor client side, and we need to use two stunnel4 instances to establish the "secure" tunnel. We can get it working with straight SSL/TLS certificates for a secure connection between the two but can't seem to add authentication to this, we want to get the stunnel4 on the client side and the stunnel4 on the server side to have to have some kind of authentication/exchange between them. Whenever we add the PSK options or client certs to the thing, we immediately get SSL/TLS problems, as it doesn't seem to support SSL/TLS handshakes properly at that point. Is there something I'm missing within the STunnel4 documentation about establishing the SSL/TLS tunnel AND adding an authentication component, or is this not possible?? It doesn't currently seem possible based on my testing... Thomas

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Stunnel 5.55 on Win 10 x64 GUI Mode
by Thomas Eifert 16 Jun '19

16 Jun '19

Tonight, I downloaded and installed Stunnel version 5.55 and installed it on Windows 10 x64 1903. If I run Stunnel as a service, everything works beautifully. No issues whatsoever. However, I just can't seem to get it to run in GUI mode. When I fire up the GUI, the configuration file loads fine with no errors. However, when attempting to establish any connection, the GUI simply crashes and the log file just terminates with nothing revealing: 2019.06.15 20:26:02 LOG7[main]: Service [ircs.3] accepted (FD=956) from 127.0.0.1:52874 2019.06.15 20:26:02 LOG7[main]: Creating a new thread 2019.06.15 20:26:02 LOG7[main]: New thread created 2019.06.15 20:26:02 LOG7[0]: Service [ircs.3] started 2019.06.15 20:26:02 LOG7[0]: Setting local socket options (FD=956) 2019.06.15 20:26:02 LOG7[0]: Option TCP_NODELAY set on local socket 2019.06.15 20:26:02 LOG5[0]: Service [ircs.3] accepted connection from 127.0.0.1:52874 2019.06.15 20:26:02 LOG6[0]: s_connect: connecting 154.35.138.250:6697 2019.06.15 20:26:02 LOG7[0]: s_connect: s_poll_wait 154.35.138.250:6697: waiting 10 seconds 2019.06.15 20:26:02 LOG7[0]: FD=1080 ifds=rwx ofds=--- (end of log) This is, of course, with the service stopped and de-installed. I've tried several remedies, including running Stunnel in compatibility modes, running it as an administrator, and I even tried to install it completely outside of the normal "program files (x86)" location. Also, the firewall is not the issue. Nothing seems to help. I can't figure out what on earth is occurring. Any insight/ideas would be appreciated. Thanks and 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.

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Using STunnel4 with both SSL/TLS proxy AND PSK authentication
by Thomas Ward 14 Jun '19

14 Jun '19

Hi, all. We've got a specific use case where we need to implement an stunnel4 'tunnel' in the following format: Client <---> client-side stunnel4 <---> server-side stunnel4 <---> server The specific case for this is because of a server that does NOT support SSL on the remote side nor client side, and we need to use two stunnel4 instances to establish the "secure" tunnel. We can get it working with straight SSL/TLS certificates for a secure connection between the two but can't seem to add authentication to this, we want to get the stunnel4 on the client side and the stunnel4 on the server side to have to have some kind of authentication/exchange between them. Whenever we add the PSK options or client certs to the thing, we immediately get SSL/TLS problems, as it doesn't seem to support SSL/TLS handshakes properly at that point. Is there something I'm missing within the STunnel4 documentation about establishing the SSL/TLS tunnel AND adding an authentication component, or is this not possible? It doesn't currently seem possible based on my testing... Thomas

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HELP! SSLv3 to TLSv1.2
by Eric Eberhard 07 Jun '19

07 Jun '19

Everyone, It goes to show that even after having used stunnel forever there is more to learn. I have a weird problem. A remote site that has always used SSLv3 wants to use TLSv1.2 - normally that takes 5 seconds in the config file. However, the remote site supplied the software that sends to them . and does not supply a version we can use unless we upgrade O/S and JAVA and who knows what else for hundreds of customers. In four days. Normally stunnel takes in clear text and sends it out in whatever you like (TLSv1.2 in this case). And the reverse. Can it take in SSLv3 and convert to TLSv1.2? Of course conceptually this is easy and just a logical extension of stunnel - in practice, if not there, it would be a job. Which I might tackle - but I first wanted to get community input. And if anyone wants to get paid to do this for me, we can talk :) Thanks All, Eric Eric S Eberhard VICS (Vertical Integrated Computer Systems) Voice: 928 567 3529 Cell : 928 301 7537 (not reliable except for text or if not home) 2933 W Middle Verde Rd Camp Verde, AZ 86322 Oh - help me out and please join this group. I need to get large numbers of members to take to the politicians. https://www.facebook.com/groups/286143052248115/ This might work to just join? <table border="0" width="100%" cellspacing="0" cellpadding="0" style="border-collapse:collapse;"><tr style=""><td height="28" style="line-height:28px;"> </td></tr><tr><td style=""><table border="0" width="280" cellspacing="0" cellpadding="0" style="border-collapse:separate;background-color:#ffffff;border:1px solid #dddfe2;border-radius:3px;font-family:Helvetica, Arial, sans-serif;margin:0px auto;"><tr style="padding-bottom: 8px;"><td style=""><img class="img" src="https://scontent.fhhr1-1.fna.fbcdn.net/v/t1.0-0/c0.0.584.305a/p320x320/ 50521766_10218655229077782_1167298564032823296_n.jpg?_nc_cat=101&_nc_ht= scontent.fhhr1-1.fna&oh=d725734d9126b706d402e635740dcd29&oe=5D00A5A4 " width="280" height="146" alt="" /></td></tr><tr><td style="font-size:14px;font-weight:bold;padding:8px 8px 0px 8px;text-align:center;">Save The Middle Verde</td></tr><tr><td style="color:#90949c;font-size:12px;font-weight:normal;text-align:center;">P ublic group . 228 members</td></tr><tr><td style="padding:8px 12px 12px 12px;"><table border="0" cellspacing="0" cellpadding="0" style="border-collapse:collapse;width:100%;"><tr><td style="background-color:#4267b2;border-radius:3px;text-align:center;"><a style="color:#3b5998;text-decoration:none;cursor:pointer;width:100%;" href="https://www.facebook.com/plugins/group/join/popup/?group_id=2861430522 48115&source=email_campaign_plugin" target="_blank" rel="noopener"><table border="0" cellspacing="0" cellpadding="3" align="center" style="border-collapse:collapse;"><tr><td style="border-bottom:3px solid #4267b2;border-top:3px solid #4267b2;color:#FFF;font-family:Helvetica, Arial, sans-serif;font-size:12px;font-weight:bold;">Join Group</td></tr></table></a></td></tr></table></td></tr><tr><td style="border-top:1px solid #dddfe2;font-size:12px;padding:8px 12px;">This group is to help preserve the Middle Verde River, the Middle Verde Character area as defined in the Town of Camp Verde's General Plan, the 260 co...</td></tr></table></td></tr><tr style=""><td height="28" style="line-height:28px;"> </td></tr></table>

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Re: [stunnel-users] stunnel-users Digest, Vol 179, Issue 1
by Larry Alba 03 Jun '19

03 Jun '19

Please Stop my subscription to the Stunnel list. Sent from Yahoo Mail on Android On Mon, Jun 3, 2019 at 3:00 AM, stunnel-users-request(a)stunnel.org<stunnel-users-request(a)stunnel.org> wrote: Send stunnel-users mailing list submissions to stunnel-users(a)stunnel.org To subscribe or unsubscribe via the World Wide Web, visit https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users or, via email, send a message with subject or body 'help' to stunnel-users-request(a)stunnel.org You can reach the person managing the list at stunnel-users-owner(a)stunnel.org When replying, please edit your Subject line so it is more specific than "Re: Contents of stunnel-users digest..." Today's Topics: 1. latest stable version for Windows (Meike Stone) ---------------------------------------------------------------------- Message: 1 Date: Mon, 3 Jun 2019 11:07:33 +0200 From: Meike Stone <meike.stone(a)googlemail.com> To: stunnel-users(a)stunnel.org Subject: [stunnel-users] latest stable version for Windows Message-ID: <CAFNHiA9=NRqkrBGjS+8sEbMjgQPYqvt4=XKuWxOz=pjYOw+FqA(a)mail.gmail.com> Content-Type: text/plain; charset="UTF-8" Hello dear list, I like to use stunnel under windows. I tried version stunnel-5.54 and it didn't work, it took a long time, until I've realized, that a bug was responsible for that. So two days after, I've seen the version 5.55b1, installed it and it works fine. But I don't see any comments in the change log on the website, in the mailing list "stunnel-announce", there was a note about that release, but now for the new release 5.55b12 not. What was changed there? I like to install a stable release on the server, so is there any recommendation which version I can or should use? Someone stated he will use version 5.49 until a new working version for windows is released .... Thanks Meike ------------------------------ Subject: Digest Footer _______________________________________________ stunnel-users mailing list stunnel-users(a)stunnel.org https://www.stunnel.org/cgi-bin/mailman/listinfo/stunnel-users ------------------------------ End of stunnel-users Digest, Vol 179, Issue 1 *********************************************

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latest stable version for Windows
by Meike Stone 03 Jun '19

03 Jun '19

Hello dear list, I like to use stunnel under windows. I tried version stunnel-5.54 and it didn't work, it took a long time, until I've realized, that a bug was responsible for that. So two days after, I've seen the version 5.55b1, installed it and it works fine. But I don't see any comments in the change log on the website, in the mailing list "stunnel-announce", there was a note about that release, but now for the new release 5.55b12 not. What was changed there? I like to install a stable release on the server, so is there any recommendation which version I can or should use? Someone stated he will use version 5.49 until a new working version for windows is released .... Thanks Meike

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