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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hey Sergio,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It depends on couple aspects of the setup.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The basic rule is that in the case you require authentication you are required to use a configured proxy and without Interception.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For SSL BUMP to work you need the clients to either access the proxy directly or to Intercept their connections.(Interception is not a must..) <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If your setup doesn't have terminal servers for multiple clients then you can use an IP to USER authentication using a variety of options such as:<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Web Authentication portal<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>DHCP level Authentication<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Radius based Authentication<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Couple others..<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>(all the above are based on IP level restrictions)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>HTTPS and HTTP filtering are a bit different but if you have a basic "catch all" rule it would be much simpler to move on from there with the logic and implementation.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Specifically for HTTPS connections if you have a list of sites that you don't need to bump and you will be using a directly configured proxy(non intercept) then you would be able to minimize the noise that comes with fake certificates generation.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br>My suggestion in general is to first declare squid as a "first" trial and testing stage for a solution.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>For some places Squid's breaking web-sockets are an overhead that cannot be tolerated while in other places it is acceptable as a security breach blocker.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If the place is not huge(200+ users) then I would start with a simple forward proxy with SSL BUMP but in a splice first(since peek and splice might not be needed due to the clients stating their target Domain Name) and later add the bump step.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>It will help you to try and see how the proxy takes the load(with filtering but without caching).<br>Then move on to the next step of authentication, maybe Kerberos or if "transparent" authentication is required but if not then a simple LDAP based one.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If SquidGuard functionality is good for you then use it.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>If not then ufdbguard or any other solution that is in your mind.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I tend to not publish my work too much here but if you want to take a peek and see how it works for you then:<br><a href="http://new.ngtech.co.il/squidblocker_en.html">http://new.ngtech.co.il/squidblocker_en.html</a> <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I also think that others work such as:<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://www.quintolabs.com/">http://www.quintolabs.com/</a> Diladele<o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="https://www.clearos.com/">https://www.clearos.com/</a><o:p></o:p></span></p><p class=MsoListParagraph style='margin-left:20.25pt;text-indent:-18.0pt;mso-list:l3 level1 lfo2'><![if !supportLists]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span dir=LTR></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="https://www.censornet.com/">https://www.censornet.com/</a><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>is worth mentioning due to their high quality.( I have tested some of them myself)<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>About ufdbguard, it's not doing authentication but only url filtering as far as I know.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Squid's way of handling authentication is one and it's not on the same "channel" as filtering but an ICAP service can do that too.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hope It Helps,<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Eliezer<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial Rounded MT Bold","sans-serif";color:#1F497D'>----<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Arial Rounded MT Bold","sans-serif";color:#1F497D'><a href="http://ngtech.co.il/lmgtfy/"><span style='color:#0563C1'>Eliezer Croitoru</span></a><br>Linux System Administrator<br>Mobile: +972-5-28704261<br>Email: eliezer@ngtech.co.il<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=183 height=69 id="Picture_x0020_1" src="cid:image004.png@01D1C1FC.A0711560"><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif"'> Sergio Belkin [mailto:sebelk@gmail.com] <br><b>Sent:</b> Thursday, June 9, 2016 1:53 AM<br><b>To:</b> Eliezer Croitoru<br><b>Cc:</b> Squid Users<br><b>Subject:</b> Re: Peek'n Splice (ssl_bump) and authentication [squid-users] Somewhat OT: Content Filter with https<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><div><div><div><p class=MsoNormal>2016-06-08 19:09 GMT-03:00 Eliezer Croitoru <<a href="mailto:eliezer@ngtech.co.il" target="_blank">eliezer@ngtech.co.il</a>>:<o:p></o:p></p><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hey Sergio,</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>There are couple approaches to content filtering in the Linux world and in other spaces.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Squid is open source and gives a lot but there are other ideas and ways to perform content filtering.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Squid was designed for caching and does things in a specific way while other solution might give a feature that would work "without interception".</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>On http it is doable to perform filtering in a very efficient way that is similar to Squid's PEEK and SPLICE but there is a need in some level of Interception in one step or another to perform the actual "block" operation.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I do not know about Open Source products that offers everything and it is very simple to understand why.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>What I know about are </span><o:p></o:p></p><p><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Squid + external tools(such as SquidGuard, ufdbguard, others)</span><o:p></o:p></p><p><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Ntop layer 7 filtering</span><o:p></o:p></p><p><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Custom DPI iptables modules</span><o:p></o:p></p><p><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>-</span><span style='font-size:7.0pt;color:#1F497D'> </span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>NFQUEUE based IPS\IDS which can act as a url filtering engine</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Consider that if you require only filtering and not caching then you can get very high performance from many applications.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The fact that Squid was designed for Caching doesn't mean that you need to use it.<br>Also there are couple cases which caching will hold your line and users speed.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The best case scenario would be to not Intercept the traffic into squid while in many cases it is not possible.</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Eliezer</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Arial Rounded MT Bold","sans-serif";color:#1F497D'>----</span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Arial Rounded MT Bold","sans-serif";color:#1F497D'><a href="http://ngtech.co.il/lmgtfy/" target="_blank"><span style='color:#0563C1'>Eliezer Croitoru</span></a><br>Linux System Administrator<br>Mobile: +972-5-28704261<br>Email: <a href="mailto:eliezer@ngtech.co.il" target="_blank">eliezer@ngtech.co.il</a></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><img border=0 width=183 height=69 id="_x0000_i1025" src="cid:image003.png@01D1C1F9.62428880"></span><o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><a href="http://www.lpi.org" target="_blank">rg</a><o:p></o:p></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></blockquote></div><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p></div><div><p class=MsoNormal>Thanks Eliezer, good summary. I've changed the subject to reflect better the issue. As far I undestand from documention one can bump https only by interception. <o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>But what about if one Windows user login against an Active Directory, will the authenticacion work to use the proxy?<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>I mean, what I'd want is:<o:p></o:p></p></div><div><p class=MsoNormal>- Only users of an Active Directory can use the proxy<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>- Block certains urls<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Is that possible with squid+ufwdbguard?<o:p></o:p></p></div><div><p class=MsoNormal style='margin-bottom:12.0pt'>Or should I use other tools/ways just like you mentioned?<o:p></o:p></p></div><div><p class=MsoNormal>Thanks in advance!<br clear=all><o:p></o:p></p></div><div><p class=MsoNormal><br>-- <o:p></o:p></p><div><div><div><div><p class=MsoNormal>--<br>Sergio Belkin<br>LPIC-2 Certified - <a href="http://www.lpi.org" target="_blank">http://www.lpi.org</a><o:p></o:p></p></div></div></div></div></div></div></div></body></html>