Hiya,

There's an issue which hasn't been mentioned here yet, so I figured I'd better 
weigh in with it: Trusted Extensions.

It's no secret that the Trusted Extensions / Sun Ray combination is popular in 
various Governments worldwide, particularly in the highly-compartmentalised 
arenas typically associated with high threat and multinational working. To this 
effect, Sun Ray has "curious security things" associated with it, such as 
Letters of Volatility to feed into assurance processes around a disconnected 
Sun Ray provably having no trace of user session information on it. Presumably 
other "zero clients" have similar Letters and assurances associated with them - 
if readers know which, it may be helpful to construct a list.

Also, there's the manner in which other "zero clients" obtain and render their 
displays. The nature of the Trusted Extensions X server means that clients 
using standard remote X11 probably wouldn't work; Glenn Faden has helpfully 
blogged about how a VNC server can be persuaded to work in a Trusted Extensions 
environment (https://blogs.oracle.com/gfaden/entry/an_update_on_using_xvnc ) so 
VNC-using clients could potentially be used, but in all cases there would need 
to be software installed on Trusted Path, so that software (as well as the 
client hardware and any smart cards, which would also fall within the scope of 
Trusted Path) would have to be subject to considerable scrutiny by appropriate 
security assessors. Again, constructing a list looks like something which needs 
to be done, and I can potentially offer some help.

(I've had Trusted Extensions sessions working just fine using VirtualBox's vRDP 
server too, which removes the need to install software on Trusted Path, but 
you're more likely to find a hen with teeth, than a security assessor happy to 
approve a multilevel or cross-domain Trusted Extensions environment installed 
on anything other than bare metal.)

Of course, there's the matter of what Oracle is going to do, as a consequence 
of discontinuing Sun Ray - and I'd guess that this is something that is 
currently being figured-out. I reckon there's a large enough installed base of 
Sun Ray that the product could be spun out and picked up as a going concern, 
especially given its proven track record and ongoing assurance in high-security 
environments, and would strongly encourage Oracle to consider this option... 

Cheers,

--
Dave Walker
Labelled Security Limited
Tel: +44 780 3079264
Twitter: @labeledsecurity
http://www.labelledsecurity.co.uk/slides

Labelled Security Limited is registered in England and Wales, No. 7666489 ; VAT 
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Registered Office: 1 Andromeda House, Calleva Park, Aldermaston, Berkshire, RG7 
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