<div dir="ltr"><div dir="ltr"><br></div>I was thinking something more simple like the first scenario.<div>[HTTP?CLIENT] -->[STUNNEL CLIENT]--><whatever>-->[STUNNEL SERVER]-->[HTTP Server]<br></div><div><br></div><div>But the end would be an HTTPS server, which would require a CONNECT to get things going.</div><div>So:</div><div>[HTTP Client] -->[STUNNEL CLIENT]--> <whatever>-->[STUNNEL SERVER]-->[REVERSE-PROXY server]--> [HTTPS SERVER]</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">Em ter, 9 de jul de 2019 às 07:00, <<a href="mailto:stunnel-users-request@stunnel.org">stunnel-users-request@stunnel.org</a>> escreveu:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Send stunnel-users mailing list submissions to<br>
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Today's Topics:<br>
<br>
1. Academic doubt about firewall bypass (Brent Kimberley)<br>
2. How to turn off logging (David Yunker)<br>
3. Re: How to turn off logging (Thomas Eifert)<br>
<br>
<br>
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<br>
Message: 1<br>
Date: Mon, 8 Jul 2019 16:42:39 +0000 (UTC)<br>
From: Brent Kimberley <<a href="mailto:brent_kimberley@rogers.com" target="_blank">brent_kimberley@rogers.com</a>><br>
To: <<a href="mailto:stunnel-users@stunnel.org" target="_blank">stunnel-users@stunnel.org</a>><br>
Cc: "<a href="mailto:hugo.marello@gmail.com" target="_blank">hugo.marello@gmail.com</a>" <<a href="mailto:hugo.marello@gmail.com" target="_blank">hugo.marello@gmail.com</a>><br>
Subject: [stunnel-users] Academic doubt about firewall bypass<br>
Message-ID: <<a href="mailto:182803560.2815516.1562604159801@mail.yahoo.com" target="_blank">182803560.2815516.1562604159801@mail.yahoo.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Which scenario did you have in mind?<br>
[HTTP?CLIENT] -->[STUNNEL CLIENT]--><whatever>-->[STUNNEL SERVER]-->[HTTP Server]?OR[HTTP Client] -->[Forward-proxy client]->?[STUNNEL CLIENT]--> <whatever>-->[STUNNEL SERVER]-->[REVERSE-PROXY server]--><whatever>--> [HTTP SERVER ]<br>
<br>
<br>
<br>
From: Hugo Marello <<a href="mailto:hugo.marello@gmail.com" target="_blank">hugo.marello@gmail.com</a>><br>
To: <a href="mailto:stunnel-users@stunnel.org" target="_blank">stunnel-users@stunnel.org</a><br>
<br>
Hello guys,<br>
I'm new to using stunnel but I find it quite a powerful tool. I'm doing a<br>
POC on how we can bypass our firewall even with DPI, and chose to use<br>
stunnel for an extra layer of cryptography. You don't have to worry about<br>
access to any VM mentioned here. Here is my scenario:<br>
<br>
[CLIENT BROWSER] -->[STUNNEL CLIENT]-->[FIREWALL]-->[STUNNEL<br>
SERVER]-->[REVERSE PROXY]-->[FREE INTERNET]<br>
<br>
So far I succeeded in getting HTTP working using stunnel CONNECT protocol<br>
to the firewall and going all the way through. The problem is when I try to<br>
access HTTPS, the connection get set to the stunnel server but it keeps<br>
waiting for something. Double checked all the logs, firewall can't discern,<br>
stunnel server get the connection, reverse proxy also get the socket<br>
connection. My hypothesis is that stunnel client gets the CONNECT from the<br>
browser and discard it, it uses its own way to connect to the firewall,<br>
instead of encrypting the CONNECT all the way through. As it may seems, I<br>
need a way to send 2 CONNECT packages. Does anyone know how can I proceed?<br>
<br>
Follow my configs:<br>
client = yes<br>
output = /var/log/stunnel4/stunnel.log<br>
debug = 7<br>
<br>
[bypassclient]<br>
accept = 4000<br>
connect = firewall.example:3128<br>
protocolHost = <a href="http://destination.com:443" rel="noreferrer" target="_blank">destination.com:443</a><br>
protocol = connect<br>
requireCert = no<br>
verifyChain = no<br>
verifyPeer = no<br>
--------------------------------------------------------------------------------------------------------------------<br>
[bypassserver]<br>
accept = <a href="http://0.0.0.0:443" rel="noreferrer" target="_blank">0.0.0.0:443</a><br>
connect = <a href="http://reverseproxy.com:8888" rel="noreferrer" target="_blank">reverseproxy.com:8888</a><br>
cert = /etc/ssl/cert.pem<br>
key = /etc/ssl/key.pem<br>
-----------------------------------------------------------------------------------------------------------------------<br>
<br>
<br>
Thank you all in advance, already digging throw the source code (quite lost<br>
tough),<br>
Hugo <br>
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Message: 2<br>
Date: Mon, 8 Jul 2019 21:46:56 +0000<br>
From: David Yunker <<a href="mailto:davidyunker@hotmail.com" target="_blank">davidyunker@hotmail.com</a>><br>
To: "<a href="mailto:stunnel-users@stunnel.org" target="_blank">stunnel-users@stunnel.org</a>" <<a href="mailto:stunnel-users@stunnel.org" target="_blank">stunnel-users@stunnel.org</a>><br>
Subject: [stunnel-users] How to turn off logging<br>
Message-ID:<br>
<<a href="mailto:MN2PR17MB27350CC77D41064964CC6B34AFF60@MN2PR17MB2735.namprd17.prod.outlook.com" target="_blank">MN2PR17MB27350CC77D41064964CC6B34AFF60@MN2PR17MB2735.namprd17.prod.outlook.com</a>><br>
<br>
Content-Type: text/plain; charset="iso-8859-1"<br>
<br>
To whom it may concern,<br>
I would like to know if there is a way to disable logging or set a size limit or to have it overwrite the log file each time a new log is started?<br>
I am using the Windows version of Stunnel.<br>
<br>
Thank you for your help.<br>
<br>
<br>
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Message: 3<br>
Date: Mon, 8 Jul 2019 17:41:37 -0500<br>
From: Thomas Eifert <<a href="mailto:kxkvi@wi.rr.com" target="_blank">kxkvi@wi.rr.com</a>><br>
To: <a href="mailto:stunnel-users@stunnel.org" target="_blank">stunnel-users@stunnel.org</a><br>
Subject: Re: [stunnel-users] How to turn off logging<br>
Message-ID: <<a href="mailto:652154f1-6422-d92f-dff3-f4adcf3aceda@wi.rr.com" target="_blank">652154f1-6422-d92f-dff3-f4adcf3aceda@wi.rr.com</a>><br>
Content-Type: text/plain; charset="windows-1252"; Format="flowed"<br>
<br>
You most likely have a statement in the global configuration section of <br>
your stunnel.conf such as "output = stunnel.log".<br>
<br>
Removing that statement should terminate logging.? If you would rather <br>
retain logging but wish the previous log to be<br>
<br>
overwritten, add the statement "log = overwrite" to the global <br>
configuration section. (without the quotes)<br>
<br>
<br>
Thomas<br>
<br>
<br>
On 7/8/2019 4:46 PM, David Yunker wrote:<br>
> To whom it may concern,<br>
> I would like to know if there is a way to disable logging or set a <br>
> size limit or to have it overwrite the log file each time a new log is <br>
> started?<br>
> I am using the Windows version of Stunnel.<br>
><br>
> Thank you for your help.<br>
><br>
><br>
><br>
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End of stunnel-users Digest, Vol 180, Issue 1<br>
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</blockquote></div></div></div>