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Re: MITM and proxy messages [was: Call for Adoption: draft-song-dns-wireformat-http]

Kari hurtta <hurtta-ietf@elmme-mailer.org> Sun, 07 August 2016 19:15 UTC

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From: Kari hurtta <hurtta-ietf@elmme-mailer.org>
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Subject: Re: MITM and proxy messages [was: Call for Adoption: draft-song-dns-wireformat-http]
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Walter H. <Walter.H@mathemainzel.info>: (Sun Aug  7 21:54:22 2016)
[ Charset ISO-8859-1 converted... ]
> On 07.08.2016 19:50, Kari hurtta wrote:
>> https://lists.w3.org/Archives/Public/ietf-http-wg/2016JulSep/0390.html
>> 
>>> configured proxies are not the bug; why not just simpy use plain HTML?
>>> 
>>> your sample chould then just be this simple:
>>> 
>>> HTTP/1.1 403 Forbidden
>>> Content-Type: text/html
>>> Cache-Control: no-cache
>>> 
>>> <!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
>>> <HTML>
>> Major browsers do not show this when they get
>> that on response of CONNECT -request.
> which in fact is caused by something different - my MITM proxy generates 
> errors that are shown by my browser;
> and these errors are simple HTML
> 
> a MITM proxy uses a certificate for signing sites ...

So that is on TLS which is tunneled via CONNECT.

> e.g. the proxy uses a certificate called  Proxy-CA, then for every site 
> you want to go to there will be a created a SSL certificate which is 
> signed by Proxy-CA;
> if the Proxy-CA was signed by a CA that is a built in token in the 
> certstore of your browser or you have installed the Proxy-CA certificate 
> in the certstore yourself, then your browser will show this simple HTML 
> error page the proxy is sending;
> 

Yes, content was

https://lists.w3.org/Archives/Public/ietf-http-wg/2016JulSep/0367.html

| In our customer base, the biggest driver to deploy MitM is the refusal 
| of browsers to display block pages from denied CONNECT requests.


https://mnot.github.io/I-D/proxy-explanation/
does not require MITM.

That can be show when CONNECT fails and tunneled TLS
is not established.

/ Kari Hurtta

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