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Sniffing Decrypted TLS Traffic With Security Onion

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I have Security Onion installed and doing full packet capture on my home network. I also have a firewall (pfSense) which does my routing. I have Security Onion sitting just behind my firewall and mirrored from a switch. It works great except I want to decrypt my SSL traffic. I would very much prefer to have the decryption take place on the fly instead of manually decrypting with wireshark that way Snort sees everything as well. I installed squid on the firewall to try to proxy my traffic but it is not working right. It forwards everything on but I can't get it to decrypt (run live capture on the firewall and it is still encrypted). If I can get this working, will that be enough (using the firewall's private key to decrypt)? If so, how would I go about setting this up in Security Onion? Thank you for your help.


The SslBump feature in Squid allows the proxy to inspect the decrypted web traffic, but the tools on the Security Onion node (Snort, Zeek etc.) will still only see the encrypted traffic because they don't support passive TLS decryption.


Wouldn't it be awesome to have a NIDS like Snort, Suricata or Zeek inspect HTTP requests leaving your network inside TLS encrypted HTTPS traffic? Yeah, we think so too! We have therefore created this guide on how to configure Security Onion to sniff decrypted TLS traffic with help of PolarProxy.


PolarProxy is a forward TLS proxy that decrypts incoming TLS traffic from clients, re-encrypts it and forwards it to the server. One of the key features in PolarProxy is the ability to export the proxied traffic in decrypted form using the PCAP format (a.k.a. libpcap/tcpdump format). This makes it possible to read the decrypted traffic with external tools, without having to perform the decryption again. It also enables packet analysis using tools that don't have built-in TLS decryption support.


Run the Security Onion setup utility by double-clicking the "Setup" desktop shortcut or executing "sudo sosetup" from a terminal. Follow the setup steps in the Production Deployment documentation and select "decrypted" as your sniffing interface.


Wait for the Elastic stack to initialize, so that the intercepted network traffic becomes available through the Kibana GUI. You can check the status of the elastic initialization with "sudo so-elastic-status".


As I said the IPS modes mentioned are able to receive traffic and return them aftewards, either from interface to interface directly with AF_PACKET or within netfilter via NFQUEUE where you can use routing etc.


Many commercial firewalls can be deployed out of band (as a sniffer) for IDS/IPS. They would need a decrypted feed to be really useful. SSL/TLS decryption needs to be done by an in-band device, because you literally man-in-the-middle the traffic.





With how much traffic is encrypted now, and the generally very high false positive rate, a part of me thinks it might not be worth the effort of tuning anymore. While I do love to play around with it, as it's intriguing from a netsec standpoint, I really just am not sure even in an enterprise environment, if it's worth the time. To me, things like PFBlocker with a very strict setup might be a better option overall for security.


Fortigates, as of FortiOS ~6.0 offer you the ability to export a packet flow that has been SSL inspected by a firewall, which is what I am going to do in this post. Unfortunately I dont have hardware to plug into a SPAN port, and I want to inspect my traffic in a virtual machine so im going to use GRE enapsulation to send a decrypt SPAN to aSecurity Onion installation. If you arent aware of security onion, you should get familiar with it, it has a lot of REALLY cool features that are super useful for analyzing traffic flows.


I did a live demo at the CS3Sthlm conference last year, titled "TLS Intercepti

Sniffing Decrypted TLS Traffic With Security Onion

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