On 24/05/17 13:44, j m wrote:
I'd like to set up a proxy on a home server so I can use it remotely
for web browsing; no filtering, nothing fancy, just a pass-through of
sorts to get around web filters. That part I've got working. The
part I haven't had luck with is encrypting the browser-to-proxy
connection. I've found some tutorials online but part of the problem
is I don't know what this feature is called when searching for
solutions to problems.
I have squid 3.5.23 on Ubuntu compiled with
'--with-openssl' '--enable-ssl' '--enable-ssl-crtd'
so I believe I'm set there. However, upon finally getting a
squid.conf that doesn't cause immediate errors when squid is started,
I find that the squid process is gone after several seconds and find
lots of these in syslog:
(squid-1): The ssl_crtd helpers are crashing too rapidly, need help!
I found a suggestion to fix this problem, but it didn't help:
rc-service squid stop
rm -rf /var/lib/ssl_db
/usr/lib/squid3/ssl_crtd -c -s /var/lib/ssl_db
rc-service squid start
So firstly, what is the actual name for what I want (encrypting proxy
to browser)?
Some people seem to be calling it "HTTPS", but that is not correct and
thankfully makes it difficult to find the bad info. (that said our own
wiki documents it on the HTTPS page referenced below :-P ).
The current IETF term for it is "TLS explicit proxy". Previously it did
not have a formal term and often got described in words like "TLS proxy"
or sometimes "TLS to the proxy" and variants switching "SSL" for "TLS".
It also has some relation to early forms of "HTTP opportunistic
security" - though that now means an HTTP version of emails STARTTLS
that is quite unrelated to anything Squid supports at present.
And secondly, any advice on the error? Or even better, a good
tutorial on setting this up? I thought if I follow a configuration
exactly, I'd be off and running with little problem.
The ssl_crtd helper in not related to TLS explicit proxy. It is a part
of SSL-Bump features for intercepting HTTPS traffic, specifically it is
the part that forges certificates.
You could avoid it entirely by removing the --enable-ssl-crtd build
option if you don't need SSL-Bump features later. Otherwise check the
directory creation and ownership permissions are correct and that Squid
http_port is *not* setup to use ssl-bump features (yet).
The TLS explicit proxy is simply a Squid that uses https_port to receive
proxy traffic, as opposed to http_port. You will need a server
certificate for that, but nothing else special on Squid's side of
things. eg:
https_port 3128 cert=blah_public.pem key=blah_private.key
The tricky part is getting a browser to talk TLS to anything other than
origin servers. The details we know of are all at
<http://wiki.squid-cache.org/Features/HTTPS#Encrypted_browser-Squid_connection>.
Amos
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