The Aerospace Clinic 2002 Team Members Nick Hertl (Project Manager) Will Berriel Richard Fujiyama Chip Bradford Faculty Advisor Professor Michael Erlinger.

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Presentation transcript:

The Aerospace Clinic 2002 Team Members Nick Hertl (Project Manager) Will Berriel Richard Fujiyama Chip Bradford Faculty Advisor Professor Michael Erlinger Aerospace Liaisons Joseph Betser, PhD Rayford Sims

Overview Background Information Tunnel Technical Approach –Completed work –Tunnel Demo –Future work Questions

Background TCP/IP Network Security Firewalls BEEP IDXP

TCP/IP Main protocols used over the Internet Provides reliable, full-duplex, peer-to- peer communication Most current application protocols use this directly: HTTP (web), SMTP ( ), etc. Multiple connections to the same machine are handled using ports

Network Security Only authorized users should be able to access private networks Some data and services should only be available internally Firewalls are used in most corporations to restrict access to network resources

Firewalls Set of rules to restrict network traffic Can filter by any combination of: –Source IP –Destination IP –Port –Protocol Rule sets are usually static

BEEP Blocks Extensible Exchange Protocol General framework for the rapid creation of application-level protocols Requires an underlying transport protocol Provides a message framing mechanism and many common service "profiles" Profiles provide transparent addition of properties to a connection (i.e. security)

Existing BEEP Profiles SSL/TLS SASL IDXP Others that don’t apply to our system. Tunnel (soon… :-)

IDXP Intrusion Detection eXchange Protocol Standard communication of Intrusion Detection messages (IDMEF) Firewall must not block authorized messages

Tunnel General purpose proxy routing BEEP profile Our focus is Tunnel for IDXP message

Tunnel Uses XML messages to establish a tunnel: Other XML attributes allow routing by IP address, service, or potentially user defined extensions.

Alternatives to Tunnel SSH –Application not intended for this purpose VPN –Long lived –Invasive to client IPsec –Requires kernel modification –Few organizations use this

Completed Work Evaluated Tunnel Specification Chose BEEP Implementations Implemented –No-Hop Tunnel –One-Hop Tunnel Some interoperability testing

Fall Schedule

Tunnel Evaluation No standard way to extend the DTD. Previously no IPv6 support in the DTD. Possibility for loops with misconfigured servers. No way to specify a Time-To-Live when using a dynamic route, ie: connecting to a service rather than a host.

Beep Implementations: JAVA: –PermaBEEP 0.8 (Better API) –Beepcore–java (TLS support) C –Roadrunner 0.9 (More fully implemented) –Beepcore–C 0.2 (Abandoned)

No-Hop Tunnel Profile and application can successfully open a tunnel to a host with no firewall in between.

One-Hop Tunnel

Let’s take a look.

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect Usually TCP

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Advertise services (Tunnel, maybe others)

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel Transport Connect Usually TCP

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel Transport Connect BEEP Greeting Advertise services (Tunnel, maybe others)

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel Transport Connect BEEP Greeting Start Tunnel

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel Transport Connect BEEP Greeting Start Tunnel OK

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel OK Transport Connect BEEP Greeting Start Tunnel OK proxy now transparently forwards messages

Tunnel host1.example.com proxy.example.com host2.example.com Transport Connect BEEP Greeting Start Tunnel OK Transport Connect BEEP Greeting Start Tunnel OK BEEP Greeting Advertise services (proxy now invisible)

Future Work Firewall daemon (Enforce Security Policy) Multi–Hop Proxying More interoperability testing between C and Java implementations. Support for java server as proxy? Bug squashing Final report

Spring Schedule

Questions?