Zorp and KZorp: Integrating Packet Filtering and Userspace proxying
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1 Zorp and KZorp: Integrating Packet Filtering and Userspace proxying Balázs Scheidler
2 Zorp Has been established in 2000, as the first BalaBit product Code was GPLd right from the start Initial set of proxies and the Zorp Core Transparent Proxying (merged finally in 2008 after a few incarnations) OS integration tools Used as a part of our solutions, and is embedded in our Firewall product We reinforced our open source efforts in 2013 published more of the code and further integration into upstream projects
3 Trends on Our Internet Internet access is ubiquitous (mobile phones, tablets, WiFi everywhere) Mobile Apps rely on the availability of the Internet (the cloud ) Traditional network boundaries became fuzzy, as we carry our devices around
4 Consequences IP addresses are not static anymore (CDNs, distributed services, ) Everything talks HTTP, not just browsers, so L7 protocols are not distinctive anymore More & more things talk HTTPS (fortunately!), which is completely opaque to most firewalls Extensions to HTTP like WebSockets & WebRTC The complexity of browsers and apps (that use HTTP) represents an ever growing attack surface
5 Traditional Firewall Approach Internal & external networks (+ DMZ) Shielding clients/servers at the perimeter Filter based on direction of connection, IP addresses, ports Protect network stacks against implementation errors (synflood, ISN problems, source routing, Xmas, DoS,...)
6 Challenges To be controlled, user visible services all use HTTP: Chatting on Facebook vs. Google Search vs. Online Banking vs. Windows Update And their IP addresses are changing all the time Direction of the connection is not really relevant anymore Network stacks became much better wrt implementation errors, and their effect is more limited Attacks move higher up in the stack
7 To provide any meaningful control, a peek into the L7 traffic is needed, sometimes even complete proxying
8 Use best of Both Worlds! Use hybrids Multiple levels of processing: Packet filtering Circuit level gateways (e.g. synproxy) Protocol aware L7 proxying Application specific (e.g. Facebook) where you need to exert more control
9 In order to make it usable, it has to be easy to switch between Processing Levels
10 With iptables/nft... It's a bit difficult Multiple rules/tables to achieve the same effect Iterative evaluation Switching a PF rule to proxying can mean changing a number of rules A bit of a low-level
11 Making it easy to switch Make it trivial to direct the firewall to do one or the other, without inflicting changes on the ruleset e.g. create a rule for online banking, or Windows Update Make it possible to switch between processing levels based on a runtime decision e.g. SSL certificates, SNI, etc
12 We wanted to make the service be the focus
13 Service Conditions, selectors are like in a firewall: IP addresses (ipv4 or ipv6) Ports Interface Zones (set of IP addresses) VPN connection Authentication information...
14 Key difference: best match, instead of iterative evaluation
15 Zorp Configuration Model Zones (set of IP addresses, but also DNS names) Service selection based on Best Match Integrating many sources of information into the condition part (interface, IP, ports, VPN, authentication, ) Actions include: Forward via packet filter Forward via Proxy Drop Lookup based instead of iterative
16 Architecture Policy & customization (Python) Zorp (proxies) kzorpd (userspace integration) KZorp kzorp (best match) Netfilter (conntrack, nat)
17 Use cases Zones based on DNS name (e.g. a rule for gmail.com, whatever IP that means) Easily add custom rule for online banking, w/o affecting the rest of the ruleset MITM for SSL encrypted HTTPS sessions, fall back to PF (or kernel level proxying) based on SNI API call inspection/alteration: transparently encrypt Google Calendar data
18 Zorp Features Proxies for a number widespread protocols (HTTP, FTP, ) Transparent at L3, L2 is possible Customizable, programmable from Python Handing over payload to further processing (virus scanning, DLP, etc)
19 Ongoing Work Separating & generalizing the KZorp component Merging as much of this to the kernel as possible Decouple Zorp from Python, and make that optional Maintaining Zorp in distributions (Debian, OpenWRT)
20 Questions? Zorp Tutorial Zorp Homepage Reach the authors: Github:
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