<div dir="ltr">Actually with the suggested blind passthrough, Squid would not handle the TLS termination.<div><div><div>So without a reverse proxy (accel mode), how will Squid know what the target is? </div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Sep 28, 2023 at 1:02 PM Alex Rousskov <<a href="mailto:rousskov@measurement-factory.com">rousskov@measurement-factory.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">On 2023-09-28 11:31, Fernando Giorgetti wrote:<br>
<br>
> And what should I do to let Squid use the SNI defined by the TLS client?<br>
<br>
What do you want Squid to use that SNI for?<br>
<br>
Alex.<br>
<br>
<br>
> On Thu, Sep 28, 2023 at 11:51 AM Alex Rousskov wrote:<br>
> <br>
>     On 2023-09-28 09:06, Fernando Giorgetti wrote:<br>
>      > Hi Matus, do you mean something like a DNAT (iptables) rule?<br>
>      > If so, I would say, it should work as well.<br>
>      ><br>
>      > But this is an environment I do not control, and I have been told<br>
>     to try<br>
>      > using an existing squid installation to proxy non-http/TLS data<br>
>     through.<br>
>      ><br>
>      > I appreciate any guidance or recommendation.<br>
> <br>
> <br>
>     Bugs notwithstanding, Squid can blindly tunnel intercepted (at TCP port<br>
>     X) TCP traffic to its intended destination:<br>
> <br>
>           https_port X intercept ssl-bump ...<br>
>           ssl_bump splice all<br>
> <br>
> <br>
>     Without interception, then Squid can only tunnel stuff inside HTTP<br>
>     CONNECT tunnels (for HTTP CONNECT requests received at TCP port Y):<br>
> <br>
>           http_port Y ssl-bump ...<br>
>           ssl_bump splice all<br>
> <br>
> <br>
>     In both cases, Squid does not care about the protocols that tunneled<br>
>     traffic is using. It could be HTTP, HTTPS, TLS, or anything else on top<br>
>     of TCP.<br>
> <br>
>     Your ACLs may differ from "all" in the above sketches, of course,<br>
>     but if<br>
>     traffic is not TLS, then you want an "ssl_bump splice" rule that<br>
>     matches<br>
>     during SslBump step1. A rule with an "all" ACLs is the simplest example<br>
>     of that.<br>
> <br>
> <br>
>     HTH,<br>
> <br>
>     Alex.<br>
>     P.S. I am getting an "Internal Server Error" when following the haproxy<br>
>     link in the original question, so I cannot map what that page says to<br>
>     the configurations above.<br>
> <br>
> <br>
>      > On Thu, Sep 28, 2023 at 3:41 AM Matus UHLAR - fantomas wrote:<br>
>      ><br>
>      >     On 27.09.23 16:48, Fernando Giorgetti wrote:<br>
>      >      >I would like to know if it is possible to set up Squid to<br>
>     perform<br>
>      >      >TLS passthrough to a given backend, relaying TLS encrypted<br>
>      >      >traffic to the backend, similarly to what HAProxy does below?<br>
>      >      ><br>
>      >     <br>
>      ><a href="https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough" rel="noreferrer" target="_blank">https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough</a> <<a href="https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough" rel="noreferrer" target="_blank">https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough</a>> <<a href="https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough" rel="noreferrer" target="_blank">https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough</a> <<a href="https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough" rel="noreferrer" target="_blank">https://www.haproxy.com/documentation/aloha/latest/security/tls/encryption-strategies/#tls-passthrough</a>>><br>
>      >      ><br>
>      >      >I have tried a few different configurations using reverse<br>
>     proxy,<br>
>      >      >or peek and splice, but I could not make it work without<br>
>     providing<br>
>      >      >a valid HTTP request or a CONNECT request.<br>
>      ><br>
>      >     what's the difference between TCP redirect and this?<br>
>      ><br>
>      >     --<br>
>      >     Matus UHLAR - fantomas, <a href="mailto:uhlar@fantomas.sk" target="_blank">uhlar@fantomas.sk</a><br>
>     <mailto:<a href="mailto:uhlar@fantomas.sk" target="_blank">uhlar@fantomas.sk</a>> <mailto:<a href="mailto:uhlar@fantomas.sk" target="_blank">uhlar@fantomas.sk</a><br>
>     <mailto:<a href="mailto:uhlar@fantomas.sk" target="_blank">uhlar@fantomas.sk</a>>><br>
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>     <<a href="http://www.fantomas.sk/" rel="noreferrer" target="_blank">http://www.fantomas.sk/</a> <<a href="http://www.fantomas.sk/" rel="noreferrer" target="_blank">http://www.fantomas.sk/</a>>><br>
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>     address.<br>
>      >     Varovanie: na tuto adresu chcem NEDOSTAVAT akukolvek reklamnu<br>
>     postu.<br>
>      >     Depression is merely anger without enthusiasm.<br>
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</blockquote></div>