Re: [squid-users] SSL bump working on most site...cert pinning issue?

From: Dan Charlesworth <dan_at_getbusi.com>
Date: Mon, 30 Jun 2014 22:56:58 +1000

Yeah, pinned SSL Ďaint gonna be bumped. The Twitter apps are another popular one that use pinning.

As far as your broken_sites ACL goes, you canít 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` youíll 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_at_slave-tothe-box.net> 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
>
>
Received on Mon Jun 30 2014 - 12:57:12 MDT

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