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Log all traffic to specific networks


We have to log all accesses to certain client systems from now on "for reasons". And actually in such a way that these accesses can be assigned to specific employees.

Question 1:

This should be done for http accesses via the WebProxy (running in transparent mode) as well as all other protocols, especially https and SSH.

Can the UTM do this and if so, how do I set it up?

Question 2:

In perspective, I would like to have a resolution of IP addresses to persons, as I can hardly reconstruct retrospectively who got which DHCP address at what time with which device. There is an extremely loose BYOD policy here :-(

Is there a possibility that access to the customer networks is only allowed after logging on to the UTM?

This should work from OSX, iOS, Windows and Android, from the LAN and from the VPN.

Many thanks for your ideas!

lg - Chris

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  • Hi Raphael,

    thank you for your input. 

    Ad Q1:

    For Http I can use http.log - but http is really a minor problem.

    Most traffic uses https which is not crossing the webfilter. But even in the packetfilter.log this traffic seems to be not logged although the "log" checkbox is ticket in the firewall rule for allowing https.

    Wenn I open "https://Some IP" on an internal client the CLI

    "tail -f /var/log/packetfilter.log | grep "Some IP""

    shows nothing.

    A quick search for a firewall rule on a lower position allowing https was negative.

    Ad Q2

    AFAIK Authentication is only useful to generally allow clients to use or not use the Webfilter-Part of the UTM. If https is not running across squid it seems a bit useless - or do I misunderstand something here? If this is enabled - does the UTM logs in clear text WHICH user reached out for WHICH Website?

    Is there any good tutorial on how to implement webfiltering for https? In former times we struggled a lot with this feature. Esp. as we are a coding company and all the developers have to test again and again their output somewhere out in the web. We had caching issues as well as a lot of work with certificates so some years ago I simply switched off https proxy.

    FW as DHCP is not an option because there is a DMZ between FW and clients and DHCP traffic is not wanted there.

    Thank you for the link to "Sophos Mobile" - but there are to many "personalities" from different companies inside. I will never be able to get all their gadgets and install a "remote control" (description by feeling!) on them. 

    Cheers - Chris

  • Hallo Chris,

    If management won't give you permission to make changes to the current setup and then support you when people complain, there's no way to accomplish what they want.  I suspect that they will want to find a different solution if they won't agree to give you the support you'll need to lock things down.

    Maybe if we knew the problem they're being confronted with instead of the solution they've imagined, we could be of more help...

    Viel Glück !

    Cheers - Bob

    Sophos UTM Community Moderator
    Sophos Certified Architect - UTM
    Sophos Certified Engineer - XG
    Gold Solution Partner since 2005
    MediaSoft, Inc. USA
  • Hi Raphael,

    I enabled "WebProxy - Log only-mode" for https. Unfortunately that broke routing for some target hosts through IPSEC LAN tunnel. The proxy grabs all the traffic before any routing or NATing rule can be applied. Is there any solution for that? Whitelisting these targets does not help.

    And: I was not looking for logging SSH access to the UTM itself but for ssh through the UTM to costumer sites. I do not need to know what the client does there I just have to notice that there was an access to.

    Thanks & cheers - Chris 

  • Hi Bob,

    right you are and I am sure, the CEOs will accept either one thing or the other.

    Right now we are in the middle o a merging process of 6 companies and I am the only full stack admin and have to integrate a bag of fleas with a bunch of different compliance rules for different costumers with different solutions. E.g. I have to bypass for some peaple the UTM using their "BYOD"-style Fortinet Firewall.

    My goal is to get rid of that poisonous zoo and to manage all via ONE user directory and ONE defined infrastructure as I did id for our company.

    Thats why I simply want to log things that happen right now... 

  • Hello Chris,

    Good day and hope you are well.

    May you share screenshot of the said configuration? "WebProxy - Log only-mode" Thanks

    For logs of SSH through UTM to Cx sites, you need to configure a Firewall Rule from *Designated network->Customer IPs& using SSH Service (Port22) then check the log firewall traffic on the firewall rule. 

    Have a nice day and thank you for choosing Sophos


    Raphael Alganes
    Community Support Engineer | Sophos Technical Support
    Sophos Support Videos Product Documentation  |  @SophosSupport  | Sign up for SMS Alerts
    If a post solves your question use the 'Verify Answer' link.

  • Hi Raphael,

    sorry for my delay.

    I misspelled the Webproxy: It is "URL filtering only" mode under WebProtection => Webfilter=>"https"

    When I switch on this option I can see https traffic in webfilter logfile. But unfortunately now the https traffic for some costumer sites that are only reachable via IPSEC tunnel is broken.

    I guess the webproxy grabs that traffic and does not reroute it through the necessary tunnel.

    Is there any solution how I can route traffic after passing webfilter? Right now I have to disable that option therefore....

    Thanks - Chris

  • Hello Chris,

    Good day and hope you are well.

    For your mentioned use case in Web Filtering you need to put the LAN network of the Branch office on the Web Filtering "Allowed Networks" on the SG device (Probably the Main/Head office where you would to use HTTPS proxy

    Then on the VPN settings of Main office > Local Networks create and use network objects of the Branch then vice versa, Branch should be configured to have Network definitions and Internet of (Head Office) to it's remote networks.

    Hope this helps. Have a nice day and thank you for choosing Sophos


    Raphael Alganes
    Community Support Engineer | Sophos Technical Support
    Sophos Support Videos Product Documentation  |  @SophosSupport  | Sign up for SMS Alerts
    If a post solves your question use the 'Verify Answer' link.

  • Hi Rapha,

    tank you for your answer.

    But it is not a branch. We have IPSEC tunnels to different costumers. They work as expected - until I switch on webfilter for https.

    And unfortunately adding the costumer target network(s) to allowed networks on webfilter global policies does not help to route the https traffic from LAN to costumer sites via the tunnel again. Clients will end up in a tie out and I have to switch off https filtering as soon as I can.

    Cheers - Chris