Re: [stunnel-users] older browsers, stunnel and privoxy (kovacs janos) - stunnel-users Digest, Vol 173, Issue 7 - stunnel-users

7 Dec 2018


Hi Janos,
mail (SMTP / POP / IMAP) are other protocols as HTTPS.
I was not able to connect via sTunnel to a server via HTTPS - and this was the reason to create and use my HTTPSProxy.
HTTPSProxy is based on this code (local front- and rear proxy are connected directly without Proxomitron):
https://prxbx.com/forums/showthread.php?tid=2172
https://prxbx.com/forums/showthread.php?tid=2191&pid=19252#pid19252
You can build your own release with python if you do not trust the versions offered by me or HeinoGanda on MSFN.
Regards
Thomas S.
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Today's Topics:
1. Re: older browsers, stunnel and privoxy (kovacs janos)
----------------------------------------------------------------------
Message: 1
Date: Fri, 7 Dec 2018 01:30:21 +0100
From: kovacs janos [email protected]
To: Flo Rance [email protected]
Cc: [email protected], [email protected]
Subject: Re: [stunnel-users] older browsers, stunnel and privoxy
Message-ID:
CAOchpkp+5YDig_XpWPFVdP9zQ-L2UN10p8Wzsm9ggv2iuWpU8Q@mail.gmail.com
Content-Type: text/plain; charset="UTF-8"
now im really not sure, since the wikipedia page on stunnel also
describes the program doing exactly what i need in the Example
scenario section:
https://en.wikipedia.org/wiki/Stunnel#Example_scenario
"Network traffic from the client initially passes over SSL to the
stunnel application, which transparently encrypts/decrypts traffic and
forwards unsecured traffic to port 25 locally. The mail server sees a
non-SSL mail client. "
only difference is, i need it to forward "unsecured traffic" to my
browser client, not a server. are you all sure its really not
possible?
On 12/5/18, kovacs janos [email protected] wrote:
...
thank you for suggestions, but can someone tell me in what cases
stunnel can be used?
i can connect to http websites through it, but https doesnt work, even
if it would otherwise do.
i try to connect to 'https://via.hypothes.is/' like this, which i can
access in browser without any proxy:
[Tunnel_in]
client = yes
accept = 127.0.0.1:443
connect = via.hypothes.is:443
i get these logs:
LOG5[1]: Service [Tunnel_in] accepted connection from 127.0.0.1:1788
LOG5[1]: s_connect: connected 104.20.214.15:443
LOG5[1]: Service [Tunnel_in] connected remote server from 192.168.0.3:1789
LOG5[1]: Connection closed: 197 byte(s) sent to TLS, 332 byte(s) sent to
socket
and the browser just shows a 'server not found' error.
with http sites its the same logs except the IP and bytes, and it
loads in the browser.
On 12/5/18, Flo Rance [email protected] wrote:
...
I would recommend to use squid which is able to do SSL bump.
https://wiki.squid-cache.org/ConfigExamples/Intercept/SslBumpExplicit
Therefore, you'll be able to connect with TLS1.0 to squid and the proxy
will establish a TLSv1.2 to the final destination.
Regards,
Flo
On Tue, Dec 4, 2018 at 9:38 PM kovacs janos [email protected]
wrote:
...
well, what i meant is forwarding to the current address the browser
connects to, so basically browsing through stunnel.
is it really that complicated to achieve that? if i configure stunnel
as a client, and make the browser send traffic to the accept address,
shouldnt stunnel encrypt the traffic with TLS and send forward to the
connect address? if thats true, shouldnt it also decrypt returning
traffic and send back to the browser?
when i configured stunnel as both client and server on the same
computer, it worked, but the browser still gave
'ssl_error_no_cypher_overlap' errors. probably because the server side
decrypted it again before it reached the website's server?
i dont necessarily need it to strip encryption, just use anything
below TLS 1.1. for example on 'https://via.hypothes.is/' i can visit
sites that would otherwise give cypher error, and they stay as https
On 12/4/18, Zizhong Zhang [email protected] wrote:
...
Hello,
...
im trying to make older browsers be able to display TLS 1.1 and TLS
1.2
sites.
i heard stunnel cant be configured to always forward to the current
site address dynamically, thats why i would use privoxy.
If by "forward to the current site address dynamically" you meant
"forward
...
to the current address of one specific domain" then stunnel can
achieve
that
...
by adding "delay = yes".
However, if I understood correctly, you wanted to let stunnel strip
or remove SSL for whatever sites you visit. Then no, I don't think you
can
...
achieve that with privoxy and stunnel. If that's what you want, I
would
suggest you use nginx to remove SSL. The following example
configuration
will let nginx "upgrade" your HTTP request to HTTPS.
events {} http { server {
resolver 9.9.9.9;
listen 80;
location / {
proxy_pass https://$host$request_uri;
proxy_set_header Host $http_host;
}
}}
You can then point any domain to the nginx server (for example, via
the
hosts file) and visit the site via HTTP. This will make HTTPS-oly
servers
happy.
That won't strip third-party HTTPS:// URL resources like NewIPNow
does,
but
...
you can use the nginx "sub_filter" to replace HTTPS with HTTP in HTML.
Also
...
there are "security features" like "Content-Security-Policy" that
prevent
modern browsers from visiting your SSL-stripped sites, but I believe
your
out-dated browser will happily ignore those.
--Zizhong

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