Andy,

Sounds like you're looking for debsums[1]? A CD/DVD is possible but
doesn't allow fingerprint updates. I know that certain Sony MemoryStick
are equipped with an rw/ro switch. So a cardreader or usb thumbdrive
makes it posible to only use 1 medium instead of two and it still has
the read-only security.

[1] http://packages.debian.org/stable/admin/debsums

Cheers,

Daniel van Eeden

On Sun, 2007-06-24 at 15:23 +0100, andy baxter wrote:
> hello,
> 
> I am writing to ask what you think of the following idea? Something that 
> I would like to see is a bootable CDROM which can check all the packages 
> on a debian system. My idea is that it would work roughly as follows:
> 
> - You halt the machine and put in a bootable CD, then reboot.
> - The machine boots from the CD, which is read-only and known to be good.
> - It boots into a minimal linux system which will do nothing but the 
> following:
> - ask you whether you are booting for the first or second time.
> - Read a floppy or other removable media to find configuration 
> information for the machine being checked.
> - Read the host machine's hard drive to find a list of all installed 
> packages.
> - Connect once to the network to retrieve a list of files and their 
> checksums for each of these packages from a debian server. This list 
> could be saved either to a designated partition on the hard drive, or to 
> removable media.
> - Disconnect from the network.
> - Reboot itself.
> - The second time round, don't connect to the network.
> - instead, check all the binaries (and optionally config files) against 
> the checksums.
> - generate some kind of easy to read report on screen, or else save it 
> to removable media.
> 
> Do you think this would work (i.e. be a good check on whether your 
> system has been compromised), and is it worth doing? I'm not sure if I 
> have the skills to take on something like this all by myself, but I 
> would be willing to put some time in to help where I can if anyone else 
> wants to have a go at it.
> 
> Alternatively, if people don't think it's worth your while developing 
> something like this, where should I start looking to try to put it 
> together myself, and is there anyone at debian who might be able to help 
> me?
> 
> yours,
> 
> andy baxter.
> 
> 


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