File modification protection

[Panayotis Vryonis]

Costas Barakitis wrote:
> 
> Yparxei tropos na 'kleidwsw' kapoia arxeia me password etsi wste an
> kapoios 6elei na ta peiraksei (akoma kai san root) na toy zhta password?
> 

Xmmm... Den nomizw oti to TCFS einai auto pou zhtas, alla
to anaferw, plhroforiaka. Ekshgoumai:

to TCFS (Trasparent Cryptographic File System),
http://tcfs.dia.unisa.it/ douleuei opws
to NFS alla ola ta arxeia grafontai xrhsimopoiwntas ena 
kryptografiko algori8mo (TripleDES h RC5). To 8ema einai
oti o ka8e user exei to diko tou key. Ta arxeia pou briskontai
ston server (NFS eipame...) einai kryptografhmena kai h 
apokryptografish ginetai ston client. Ara, o root tou server DEN 
mporei na allaksei ta arxeia auta (mporei bebaia na ta sbhsei...).

To TCFS exei kai ena allo wraio xarakthristiko. Yposthrizei
groups. Dhladh, mporei kaneis na pei oti ena arxeio 8a einai
dia8eshmo mono an kapoioi xrhstes "sprwksoun" ta kleidia tous.
San na lame, ena xrhmatokibwtio me duo, treis kleidaries kai
ta kleidia moirasmena se diaforetikous an8rwpous...

Parolla auta, o root einai o ROOT!!! An o root 8elei, o,ti kai 
na kaneis mporei... Skepsou mono oti mporei na kanei compile
opoio programma xreiazetai (akomh kai ton kernel...) etsi wste
na ktataei ta passwords pou tou dinontai se ena arxeio!!!

Panayotis.
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