[squid-users] Skype for Business behind a transparent squid (TProxy) HTTP/S
Sameh Onaissi
sameh.onaissi at solcv.com
Wed Dec 7 16:08:30 UTC 2016
iptables-save: http://pastebin.com/9JrVANtt
ipset list : http://pastebin.com/wtMtzaQe
[http://pastebin.com/i/facebook.png]<http://pastebin.com/wtMtzaQe>
Name: bypascidrspool Type: hash:net Revision: 6 Header: family inet hashsiz - Pastebin.com<http://pastebin.com/wtMtzaQe>
pastebin.com
[http://pastebin.com/i/facebook.png]<http://pastebin.com/9JrVANtt>
# Generated by iptables-save v1.6.0 on Wed Dec 7 11:03:51 2016 *mangle :PRERO - Pastebin.com<http://pastebin.com/9JrVANtt>
pastebin.com
[https://encrypted-tbn1.gstatic.com/images?q=tbn:ANd9GcQfU2bXCBPGhd5da40t2NysagP5_TdzOv6NOC14r3PXrn5b8k8cog] Piensa en el medio ambiente antes de imprimir este email.
________________________________
From: Eliezer Croitoru <eliezer at ngtech.co.il>
Sent: Wednesday, December 7, 2016 10:58:18 AM
To: Sameh Onaissi
Cc: squid-users at lists.squid-cache.org
Subject: RE: [squid-users] Skype for Business behind a transparent squid (TProxy) HTTP/S
Give us the “iptables-save” output and also “ipset list”.
(or what ever was the command of ipset to dump the content of the list).
After this we can understand what is causing this issue.
Eliezer
----
http://ngtech.co.il/lmgtfy/
Linux System Administrator
Mobile: +972-5-28704261
Email: eliezer at ngtech.co.il
From: Sameh Onaissi [mailto:sameh.onaissi at solcv.com]
Sent: Wednesday, December 7, 2016 5:23 PM
To: Eliezer Croitoru <eliezer at ngtech.co.il>
Cc: squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Still not working and I do not know what to do next.
access.log shows IPs and domains that are supposed to be bypassed already.
Any further instructions are hugely appreciated.
Piensa en el medio ambiente antes de imprimir este email.
On Dec 7, 2016, at 9:50 AM, Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
wrote:
Was there any progress with the script and the issues?
Eliezer
----
http://ngtech.co.il/lmgtfy/
Linux System Administrator
Mobile: +972-5-28704261
Email: mailto:eliezer at ngtech.co.il
From: Sameh Onaissi [mailto:sameh.onaissi at solcv.com]
Sent: Wednesday, December 7, 2016 12:36 AM
To: Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
Cc: 'Amos Jeffries' <mailto:squid3 at treenet.co.nz>;
mailto:squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Hello Eliezer and thanks again.
I ran the script with the tproxy argument.
Tried to reconnect skype for business...
After about a 3 min wait, a pop up saying "Skype for Business couldn't find
a skype for business server" and access log shows:
1481061269.006 400 10.0.0.38 TCP_MISS/200 1068 GET
http://lyncdiscover.solcv.com/? - ORIGINAL_DST/132.245.1.28
application/vnd.microsoft.rtc.autodiscover+xml
1481061269.270 667 10.0.0.38 TAG_NONE/200 0 CONNECT 132.245.1.28:443 -
HIER_NONE/- -
1481061269.270 665 10.0.0.38 TCP_TUNNEL/200 5568 CONNECT
lyncdiscover.solcv.com:443 - ORIGINAL_DST/132.245.1.28 -
1481061269.770 596 10.0.0.38 TAG_NONE/200 0 CONNECT 52.112.64.14:443 -
HIER_NONE/- -
1481061269.770 594 10.0.0.38 TCP_TUNNEL/200 6981 CONNECT
webdir0a.online.lync.com:443 - ORIGINAL_DST/52.112.64.14 -
1481061270.679 897 10.0.0.38 TAG_NONE/200 0 CONNECT 52.112.64.14:443 -
HIER_NONE/- -
1481061270.679 895 10.0.0.38 TCP_TUNNEL/200 7733 CONNECT
webdir0a.online.lync.com:443 - ORIGINAL_DST/52.112.64.14 -
1481061272.178 841 10.0.0.38 TAG_NONE/200 0 CONNECT 23.100.120.65:443 -
HIER_NONE/- -
1481061272.178 840 10.0.0.38 TCP_TUNNEL/200 20539 CONNECT
login.microsoftonline.com:443 - ORIGINAL_DST/23.100.120.65 -
1481061273.713 641 10.0.0.38 TAG_NONE/200 0 CONNECT 52.112.64.14:443 -
HIER_NONE/- -
1481061273.713 640 10.0.0.38 TCP_TUNNEL/200 8037 CONNECT
webdir0a.online.lync.com:443 - ORIGINAL_DST/52.112.64.14 -
1481061273.751 3054 10.0.0.38 TAG_NONE/200 0 CONNECT 52.112.64.14:443 -
HIER_NONE/- -
1481061273.751 3052 10.0.0.38 TCP_TUNNEL/200 24458 CONNECT
webdir0a.online.lync.com:443 - ORIGINAL_DST/52.112.64.14 -
1481061273.751 1544 10.0.0.38 TAG_NONE/200 0 CONNECT 52.112.64.14:443 -
HIER_NONE/- -
1481061273.751 1543 10.0.0.38 TCP_TUNNEL/200 11653 CONNECT
webdir0a.online.lync.com:443 - ORIGINAL_DST/52.112.64.14 -
so I added more ip ranges to the cidr-to-bypass.txt and ran the script again
1481063243.370 371 10.0.0.38 TCP_MISS/200 1068 GET
http://lyncdiscover.solcv.com/? - ORIGINAL_DST/134.170.113.210
application/vnd.microsoft.rtc.autodiscover+xml
1481063278.271 74233 10.0.0.38 TAG_NONE/200 0 CONNECT 104.208.31.113:443 -
HIER_NONE/- -
1481063278.271 74231 10.0.0.38 TCP_TUNNEL/200 6746 CONNECT
pipe.skype.com:443 - ORIGINAL_DST/104.208.31.113 -
1481063344.143 60720 10.0.0.38 TAG_NONE/200 0 CONNECT 104.208.31.113:443 -
HIER_NONE/- -
1481063344.143 60719 10.0.0.38 TCP_TUNNEL/200 6389 CONNECT
pipe.skype.com:443 - ORIGINAL_DST/104.208.31.113 -
a new set showed up...
what more can we do?
keep adding ip ranges?
thanks
Piensa en el medio ambiente antes de imprimir este email.
________________________________________
From: Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
Sent: Tuesday, December 6, 2016 4:36:56 PM
To: Sameh Onaissi
Cc: 'Amos Jeffries'; mailto:squid-users at lists.squid-cache.org
Subject: RE: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Try the next script:
https://gist.github.com/elico/a54c2c8f8e1a2407b42210896b960f4b
https://gist.github.com/elico/a54c2c8f8e1a2407b42210896b960f4b
https://gist.github.com/elico/a54c2c8f8e1a2407b42210896b960f4b
gist.github.com
bypass squid interception for skype
It has two modes: regular and tproxy.
In your case you should run the script with:
$ bypass-skype-cidr.sh tproxy
The tproxy flag should do the trick for you.
Let me know if it works for you.
Eliezer
----
http://ngtech.co.il/lmgtfy/
Linux System Administrator
Mobile: +972-5-28704261
Email: mailto:eliezer at ngtech.co.il
From: Sameh Onaissi [mailto:sameh.onaissi at solcv.com]
Sent: Tuesday, December 6, 2016 9:24 PM
To: Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
Cc: Amos Jeffries <mailto:squid3 at treenet.co.nz>;
mailto:squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Yes please, I would appreciate help with that script.
As I aforementioned, totally new to all this
Piensa en el medio ambiente antes de imprimir este email.
On Dec 6, 2016, at 1:27 PM, Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
wrote:
Now you can enhance the script by adding manually the ntop skype related
networks based on:
https://github.com/ntop/nDPI/blob/d9a2d9a6bd4d476d666d26cb713952760a975d92/s
rc/lib/ndpi_content_match.c.inc#L286
/*
Skype (Microsoft CDN)
157.56.135.64/26, 157.56.185.0/26, 157.56.52.0/26,
157.56.53.128/25, 157.56.198.0/26
157.60.0.0/16, 157.54.0.0/15
13.107.3.128/32
13.107.3.129/32
111.221.64.0 - 111.221.127.255
91.190.216.0/21 (AS198015 Skype Communications Sarl)
91.190.218.0/24
40.126.129.109/32
65.55.223.0/26
*/
If you need help scripting this let me know.
Eliezer
----
http://ngtech.co.il/lmgtfy/
Linux System Administrator
Mobile: +972-5-28704261
Email: mailto:eliezer at ngtech.co.il
From: Sameh Onaissi [mailto:sameh.onaissi at solcv.com]
Sent: Tuesday, December 6, 2016 7:29 PM
To: Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
Cc: Amos Jeffries <mailto:squid3 at treenet.co.nz>;
mailto:squid-users at lists.squid-cache.org
Subject: Re: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Hello,
OK, I added the ssl_bump slice on the skype domains text file
I installed ipset and ran the script.
Now access.log has much less skype related logs:
What is left is:
1481044996.398 3412 10.0.0.11 TAG_NONE/200 0 CONNECT 132.245.1.32:443 -
ORIGINAL_DST/132.245.1.32 -
1481044996.423 0 10.0.0.11 TAG_NONE/400 3998 REGISTER
sip:solcv.comSIP/2.0 - HIER_NONE/- text/html
1481045000.296 372 10.0.0.11 TAG_NONE/200 0 CONNECT 134.170.113.207:443 -
ORIGINAL_DST/134.170.113.207 -
1481045000.325 0 10.0.0.11 TAG_NONE/400 3998 REGISTER
sip:solcv.comSIP/2.0 - HIER_NONE/- text/html
1481045008.685 4259 10.0.0.11 TAG_NONE/200 0 CONNECT 134.170.113.207:443 -
ORIGINAL_DST/134.170.113.207 -
1481045008.726 0 10.0.0.11 TAG_NONE/400 3998 REGISTER
sip:solcv.comSIP/2.0 - HIER_NONE/- text/html
although http://solve.com is in the text file.
I ran whois on the first IP and got:
NetRange: 132.245.0.0 - 132.245.255.255
CIDR: 132.245.0.0/16
NetName: MICROSOFT
Same with the 134.170. address. Can we slice that range?
Sameh Onaissi
Ingeniero de Soporte
Sol Cable Visión
Cel: 316-3023424
Email: mailto:sameh.onaissi at solcv.com
Piensa en el medio ambiente antes de imprimir este email.
On Dec 6, 2016, at 12:11 PM, Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
wrote:
Hey,
Depends on your OS you will need to installthe ipset package.
Try to run "apt-get install ipset".
And then run the script.
Eliezer
----
http://ngtech.co.il/lmgtfy/
Linux System Administrator
Mobile: +972-5-28704261
Email: mailto:eliezer at ngtech.co.il
<Untitled Attachment 1.jpg>
From: Sameh Onaissi [mailto:sameh.onaissi at solcv.com]
Sent: Tuesday, December 6, 2016 5:23 PM
To: Amos Jeffries <mailto:squid3 at treenet.co.nz>
Cc: Eliezer Croitoru <mailto:eliezer at ngtech.co.il>
Subject: Re: [squid-users] Skype for Business behind a transparent squid
(TProxy) HTTP/S
Amos, thanks for the reply.
This is getting more confusing.
I changed the script to: http://pastebin.com/jLgywstg
And I ran it, but I am getting errors:
sudo sh http://bypass.sh/ + iptables -t mangle -L PREROUTING + grep
bypasspool + [ 1 -ne 0 ] + iptables -t mangle -I PREROUTING -m set
--match-set bypasspool dst,src -j DIVERT iptables http://v1.6.0/ Set
bypasspool doesn't exist. Try `iptables -h' or 'iptables --help' for more
information. + ipset create bypasspool hash:ip http://bypass.sh/ 10:
http://bypass.sh/ ipset: not found + read item +
echohttp://lyncdiscover.solcv.com/ http://lyncdiscover.solcv.com/ + host -4
http://lyncdiscover.solcv.com/ + grep has address + awk {print $4} + xargs
-l1 ipset add bypasspool xargs: ipset: No such file or directory + read item
+ echo http://webdir0a.online.lync.com/http://webdir0a.online.lync.com/ +
host -4 http://webdir0a.online.lync.com/ + grep has address + awk {print $4}
+ xargs -l1 ipset add bypasspool xargs: ipset: No such file or directory
. this goes on the same for all the domains in the text file
My iptables is still <http://pastebin.com/SqpbmYQQ>
I did not quite understand what you meant by
You should test whether -m set or -m socket work faster and put that one
first. My change above places it at line 2 (after -m socket) assuming
your iptables script is still <http://pastebin.com/SqpbmYQQ>
should I incorporate the bypass script into my iptables.sh script? run
iptables first then bypass?
On a side note, would adding ssl_bump exceptions to squid.conf do it?
Something like:
acl skype_domains <path to file>
ssl_bump splice skype_domains
ssl_bump bump all
Again, thanks again for your help.
<Untitled Attachment 2.jpg> Piensa en el medio ambiente antes de imprimir
este email.
On Dec 6, 2016, at 9:50 AM, Amos Jeffries <mailto:squid3 at treenet.co.nz>
wrote:
On 7/12/2016 3:19 a.m., Sameh Onaissi wrote:
Hello,
I tried doing the changes to nat/REDIRECT in iptables.sh and I must have
messed up somewhere, so I am sticking with mangle/tproxy for now since squid
is working with them.
How can I change Eliezer's script to mangle/tproxy?
https://gist.github.com/elico/e0faadf0cc63942c5aaade808a87deef
Excuse my novice knowledge in iptables.
No worries.
You need to change where iptables attaches the 'bypasspool'. Both the
table/location (-t) and the jump/action (-j).
iptables -t mangle -L PREROUTING |grep bypasspool
if [ "$?" -ne "0" ];then
iptables -t mangle -I 2 PREROUTING \
-m set --match-set bypasspool dst,src \
-j DIVERT
fi
You should test whether -m set or -m socket work faster and put that one
first. My change above places it at line 2 (after -m socket) assuming
your iptables script is still <http://pastebin.com/SqpbmYQQ>
(Your script should do that line adding, not Eliezers - so that you can
be sure the order is always correct).
BTW: you should use iptables-save / iptables-restore instead of a slow
script calling iptables "manually". Those other tools will ensure there
are no gaps in the firewall initialization for nasty traffic to sneak
through.
I am looking at access.log to collect all domains I see heading to skype for
business, as well as IPs. My question is, can I add the domains AND IPs into
the domains-to-bypass.txt that the above script uses?
IIRC you should be able to use domain as the parameter to ipset. But it
will resolve the domain immediately and only add those IPs that it finds
at that time into the pool. Any future changes, or a hidden set of IPs
that rotate in/out will not be listed.
Amos
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