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Re: SSL bump working on most site...cert pinning issue?

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On Mon, 2014-06-30 at 22:56 +1000, Dan Charlesworth wrote:
> Yeah, pinned SSL ‘aint gonna be bumped. The Twitter apps are another popular one that use pinning.
> 
> As far as your broken_sites ACL goes, you can’t use `dstdomain` because the only thing Squid can see of the destination before bumping an intercepted connection is the IP address. So for `ssl_bump none` you’ll need to be use `dst` ACLs instead.
> 
> ProTip: Here are the Apple and Akamai public IP blocks (to use in a dst equivalent of your broken_sites), respectively: 17.0.0.0/8, 23.0.0.0/12.
> 
> Good luck
> 
> On 30 Jun 2014, at 10:38 pm, James Lay <jlay@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > Topic pretty much says it...most sites work fine using my below set up,
> > but some (Apple's app store) do not.  I'm wondering if cert pinning is
> > the issue?  Since this set up is basically two separate sessions, I
> > packet captured both.  The side the I have control over gives me a TLS
> > Record Layer Alert Close Notify.  I am unable to decrypt the other side
> > as the device in question is an iDevice and I can't capture the master
> > secret.
> > 
> > I've even tried to ACL certain sites to not bump, but they don't go
> > through.  Below is my complete setup.  This is running the below:
> > 
> > Squid Cache: Version 3.4.6
> > configure options:  '--prefix=/opt' '--enable-icap-client'
> > '--enable-ssl' '--enable-linux-netfilter'
> > '--enable-follow-x-forwarded-for' '--with-large-files'
> > '--sysconfdir=/opt/etc/squid'
> > 
> > 
> > Any assistance with troubleshooting would be wonderful...thank you.
> > 
> > James
> > 
> > 
> > 
> > $IPTABLES -t nat -A PREROUTING -i eth0 -s 192.168.1.96/28 -p tcp --dport
> > 80 -j REDIRECT --to-port 3128
> > $IPTABLES -t nat -A PREROUTING -i eth0 -s 192.168.1.96/28 -p tcp --dport
> > 443 -j REDIRECT --to-port 3129
> > 
> > 
> > acl localnet src 192.168.1.0/24
> > 
> > acl SSL_ports port 443
> > acl Safe_ports port 80		# http
> > acl Safe_ports port 21		# ftp
> > acl Safe_ports port 443		# https
> > acl Safe_ports port 70		# gopher
> > acl Safe_ports port 210		# wais
> > acl Safe_ports port 1025-65535	# unregistered ports
> > acl Safe_ports port 280		# http-mgmt
> > acl Safe_ports port 488		# gss-http
> > acl Safe_ports port 591		# filemaker
> > acl Safe_ports port 777		# multiling http
> > 
> > acl CONNECT method CONNECT
> > acl broken_sites dstdomain textnow.me
> > acl broken_sites dstdomain akamaiedge.net
> > acl broken_sites dstdomain akamaihd.net
> > acl broken_sites dstdomain apple.com 
> > acl allowed_sites url_regex "/opt/etc/squid/url.txt"
> > acl all_others dst all
> > acl SSL method CONNECT
> > 
> > 
> > http_access deny !Safe_ports
> > http_access deny CONNECT !SSL_ports
> > 
> > http_access allow manager localhost
> > http_access deny manager
> > 
> > http_access allow allowed_sites
> > http_access deny all_others 
> > http_access allow localnet
> > http_access allow localhost
> > 
> > http_access deny all
> > icp_access deny all
> > 
> > sslproxy_cert_error allow broken_sites
> > sslproxy_cert_error deny all
> > 
> > sslproxy_options ALL
> > ssl_bump none broken_sites
> > ssl_bump server-first all
> > 
> > http_port 192.168.1.253:3128 intercept 
> > https_port 192.168.1.253:3129 intercept ssl-bump
> > generate-host-certificates=on cert=/opt/sslsplit/sslsplit.crt
> > key=/opt/sslsplit/sslsplitca.key options=ALL sslflags=NO_SESSION_REUSE
> > 
> > always_direct allow all
> > 
> > 
> > hierarchy_stoplist cgi-bin ?
> > 
> > access_log syslog:daemon.info common
> > 
> > refresh_pattern ^ftp:		1440	20%	10080
> > refresh_pattern ^gopher:	1440	0%	1440
> > refresh_pattern -i (cgi-bin|\?)	0	0%	0
> > refresh_pattern .		0	20%	4320
> > 
> > icp_port 3130
> > 
> > coredump_dir /opt/var
> > 
> > 

So adding:

acl broken_sites dst 23.0.0.0/12

now gives me the below:

Jun 30 20:16:51 gateway (squid-1): 192.168.1.100 - -
[30/Jun/2014:20:16:51 -0600] "CONNECT 23.204.162.217:443 HTTP/1.1" 403
3385 TCP_DENIED:HIER_NONE
Jun 30 20:16:51 gateway (squid-1): 192.168.1.100 - -
[30/Jun/2014:20:16:51 -0600] "NONE error:invalid-request HTTP/0.0" 400
3981 TAG_NONE:HIER_NONE

So something is off.  Any help on these beastie?  Thank you.

James





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