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    Verifying SSL site certificate verification

    Scheduled Pinned Locked Moved General pfSense Questions
    21 Posts 7 Posters 3.5k Views
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    • DerelictD Offline
      Derelict LAYER 8 Netgate
      last edited by

      peek/splice, not MITM.

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      • J Offline
        Jdwind
        last edited by

        Then what should I to do? Disable MITM, enable transparent proxy in squid? I found only in Squid (in SSL Man In the Middle Filtering section) that information: Please see SslBump Peek and Splice wiki documentation for additional details - but there http://wiki.squid-cache.org/Features/SslPeekAndSplice is not information how use it with Pfsense. Can you tell me some more about how do that, please?

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        • C Offline
          Chrismallia
          last edited by

          Here is mine

          sp.PNG
          sp.PNG_thumb

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          • D Offline
            doktornotor Banned
            last edited by

            @Jdwind:

            But SSL MITM is more security

            https://www.us-cert.gov/ncas/alerts/TA17-075A

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            • J Offline
              Jdwind
              last edited by

              Thank you, doktornotor. I have installed end-point antyvirus on every host too. In my network I must have any security solution (like IPS/IDS - I use Snort package), that why I used MITM and SSL filtering. Chrismallia show his configuration, but if I am not wrong he has MITM and SSL filtering too. Only different is with SSL/MITM mode - I have default, he Splice All. That's all?

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              • C Offline
                Chrismallia
                last edited by

                with splice all you do not need to install certs on devices, it is mostly good for only filtering  no AV, so it does not break the  ssl connection  or inspect content, it uses the SNI, anyone correct me if I am mistaken in any way

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                • D Offline
                  doktornotor Banned
                  last edited by

                  @Jdwind:

                  Thank you, doktornotor. I have installed end-point antyvirus on every host too.

                  Oh noes. That was NOT the point. The point was that MITM is evil.

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                  • J Offline
                    Jdwind
                    last edited by

                    I tried this settings (from Chrismallia) on virtual network, Pfsense and two hosts and  what can I say… it works. Antivirus dont works with SSL, but I have it installed on every host. Thank you all for help and explanation very, very much. But one thing more that I can't understand (after Doktornotor post) - it is still MITM enabled - does it matter?
                    Best regards

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                    • johnpozJ Offline
                      johnpoz LAYER 8 Global Moderator
                      last edited by

                      no with splice your not your doing a peek and then splicing it back.. The client is getting the actual cert from the server.. Your just peaking inside to see where they are going, etc.  And if it should be filtered.

                      "splice: Become a TCP tunnel without decoding the connection. The client and the server exchange data as if there is no proxy in between."

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                      • J Offline
                        Jdwind
                        last edited by

                        Thank you very much again, so now I have everything ok. With Squidguard ssl filtering just works.

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                        • H Offline
                          Harvy66
                          last edited by

                          There are many attack vectors to infect machines when MITM is used. SSL provides two things, privacy and security. The security is provided by the signing. When you MITM, you break the signing, which means you break the security.

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                          • K Offline
                            kpa
                            last edited by

                            With MITM you're breaking the chain of trust normally provided the trusted third party signatures found on the certificates. Your users will no longer be able to verify that they are connecting to the real deal when they connect to a HTTPS site, instead they can at maximum be sure only that they are connecting to your MITM proxy.

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                            • J Offline
                              Jdwind
                              last edited by

                              It is too much  for my mind… Yes, now I know you are both right. But now, when I'm using peek and splice all mode with MITM and I can see every certificate verificated by.. i.e. Verisign, Symante, Oracle.. now my network settings are right - am I right or am I wrong?
                              EDIT:
                              I found that thread https://forum.pfsense.org/index.php?topic=123461.0, there is more explanation about my doubts. Thank you once more.

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