[squid-users] squid 3.5.3 can't get peek and splice to not bump certain sites

[Nathan Hoad]

Hi Stan,

Yep, I think the server_name acl in 3.5.4 should provide what you want
without the need for an external acl now. I haven't used it as the
external acl fits my usecase. I imagine doing something like this
should work for server_name though...

acl sni_exclusions ssl::server_name wellsfargo.com
acl tcp_level at_step SslBump1
acl client_hello_peeked at_step SslBump2

ssl_bump peek tcp_level all
ssl_bump splice client_hello_peeked sni_exclusions
ssl_bump bump all

Hopefully your other issue with your perl helper hanging has been
resolved by Jason's recommendation! Though if this does what you want,
you may not need the helper.

Also, please try to keep messages to the mailing list - this is all
information that will help others :)

Thanks,

Nathan.

On 5 May 2015 at 13:20, Stanford Prescott <stan.prescott at gmail.com> wrote:
> Hi Nathan. I have decided to try to go ahead and try to get peek and splice
> working for Squid on the Smoothwall Express firewall distro since we will
> not be able to migrate to Squid 4.x when it debuts. You previously kindly
> offered an example of a squid.conf setup for me to try to get it working.
>
> external_acl_type sni ttl=30 concurrency=X children-max=Y
> children-startup=Z %ssl::>sni /path/to/your/helper
>
> acl sni_exclusions external sni
> acl tcp_level at_step SslBump1
> acl client_hello_peeked at_step SslBump2
>
> ssl_bump peek tcp_level all
> ssl_bump splice client_hello_peeked sni_exclusions
> ssl_bump bump all
>
> Amos says he has back ported a server_name acl with the 3.5.4 release. Does
> this now mean that the "external_acl_type" is no longer needed for this sort
> of function? Specifically, I want to be able to allow my users to enter
> websites that they do not want bumped, like banking websites. I wasn't able
> to get the squid.conf and helper script example you provided to work for me.
>
> Does the new server_name acl change how this can be done? Would you be able
> to provide a new example for me to try based on this new acl in squid 3.5.4?
>
> Any help is greatly appreciated.
>
> Stan
>
>
> On Sun, Apr 12, 2015 at 7:25 PM, Nathan Hoad <nathan at getoffmalawn.com>
> wrote:
>>
>> Hi Stan,
>>
>> For peek and splice, you need to decide based on the SNI name, not the
>> domain name, which for 3.5 means you need to use an external ACL
>> helper that processes %ssl::>sni. For 4.0 there will be a server_name
>> ACL you can use instead.
>>
>> On top of that, you also need to make sure this external ACL helper
>> runs at the correct "bump step", with the at_step ACL, e.g...
>>
>> external_acl_type sni ttl=30 concurrency=X children-max=Y
>> children-startup=Z %ssl::>sni /path/to/your/helper
>>
>> acl sni_exclusions external sni
>> acl tcp_level at_step SslBump1
>> acl client_hello_peeked at_step SslBump2
>>
>> ssl_bump peek tcp_level all
>> ssl_bump splice client_hello_peeked sni_exclusions
>> ssl_bump bump all
>>
>> Hope that helps,
>>
>> Nathan.
>>
>> On 13 April 2015 at 04:12, Stanford Prescott <stan.prescott at gmail.com>
>> wrote:
>> > I would like to give my users the ability to "not bump" certain sites. I
>> > tried to use the examples given on the SSLPeekandSplice wiki page but
>> > can't
>> > get it to work.
>> >
>> > This is a snippet of my squid.conf file.
>> >
>> > https_port 192.168.10.1:808 intercept ssl-bump
>> > generate-host-certificates=on
>> > dynamic_cert_mem_cache_size=4MB
>> > cert=/var/smoothwall/mods/proxy/ssl_cert/squidCA.pem
>> >
>> > http_port 192.168.20.1:800 intercept
>> > https_port 192.168.20.1:808 intercept ssl-bump
>> > generate-host-certificates=on
>> > dynamic_cert_mem_cache_size=4MB
>> > cert=/var/smoothwall/mods/proxy/ssl_cert/squidCA.pem
>> >
>> > http_port 127.0.0.1:800 intercept
>> >
>> > sslproxy_cert_error allow all
>> > sslproxy_flags DONT_VERIFY_PEER
>> > sslproxy_session_cache_size 4 MB
>> >
>> > acl serverIsBank dstdomain wellsfargo.com
>> >
>> > ssl_bump server-first all
>> >
>> > ssl_bump none localhostgreen
>> > ssl_bump none localhostpurple
>> >
>> > ssl_bump splice serverIsBank
>> > ssl_bump peek all
>> > ssl_bump bump all
>> > sslcrtd_program /var/smoothwall/mods/proxy/libexec/ssl_crtd -s
>> > /var/smoothwall/mods/proxy/lib/ssl_db -M 4MB
>> > sslcrtd_children 5
>> >
>> >
>> > When I start squid I don't get any error messages and all pages, http
>> > and
>> > https, load properly. The problem is, using the example above, the
>> > https://www.wellsfargo.com website is still getting bumped, evidenced by
>> > the
>> > appearance of the ssl website in the web proxy access logs. When I don't
>> > have ssl_bump enabled then no https websites appear in the access logs,
>> > as
>> > it should be. But, enabling ssl_bump and peek and splice, web sites that
>> > I
>> > am trying not to bump still seem to be getting bumped.
>> >
>> > Any suggestions on how to properly "not bump" certain websites.
>> >
>> > Thanks,
>> >
>> > Stan
>> >
>> > _______________________________________________
>> > squid-users mailing list
>> > squid-users at lists.squid-cache.org
>> > http://lists.squid-cache.org/listinfo/squid-users
>> >
>
>