Antitheft HowTo

This document outlines antitheft-related procedures.

Example scenarios

Upgrade and activate a set of XOs

To accomplish this, you need 3 machines in total.

• An XO acting as the Master Lease Signing Server (MSS)
• An XS (can be XS-on-XO machine)
• An XO running as NANDBlast sender

And your master keys.

Steps

1. On the MSS, create a lease.sig file with leases for all the XOs you will upgrade and activate.
2. On the XS, load the lease.sig file so that xs-activation can use it
3. On the NANDBlast machine, prepare to run nb-secure, as described in Multicast_NAND_FLASH_Update#NANDblasting_a_Signed_NAND_Image_File
4. Setup the XS and the NANDBlast machine in the "upgrade" room and commence the unpack/start process

Procedures

Prepare an XO as the Master Signing Server (MSS)

This machine is only used to generate leases, devkeys or delegations. In other words, it is of occassional use, and should be kept in a secure place at all times.

1. Grab an XO, with the standard OS image. These notes are based on XO OS 8.2.1, but should work on future versions.
2. Install the latest olpc-bios-crypto package:
   1. Download the latest one from [1]
   2. Install it with rpm -ivh olpc-bios-crypto-(version).rpm
3. Make a new directory to store the master keys: mkdir /root/masterkeys
4. Copy the master keys into /root/masterkeys - you will normally have the files developer.private developer.public fs.private fs.public fw.private fw.public lease.private lease.public oats.private oats.public os.private os.public

Done! Now keep this machine in a safe location.

Generate activation leases on the MSS

You will usually have a spreadsheet provided by OLPC with the serial numbers, uuids and box number. You need to define which XOs / boxes activated...

Stage 1 - create the CSV file

1. open spreadsheet in OpenOffice Calc
2. find them relevant XOs in the spreadsheet
3. make a new page in the existing spreadsheet - give that page the

name of the school

1. copy/paste the SN/UUID region to the new page, remove the "extra"

columns we don't need. Also make sure you don't include the 'column headers' row.

1. Save the document
2. Make sure you are on the spreadsheet page for the right school
3. Now use the "File->Save As..." menu option to create a new file.

The file format must be CSV. The file name must be the name of the school.

1. OpenOffice will offer a "Text export / field options" dialogue...
   1. Character set: leave it as it is (Unicode UTF-8).
   2. Field separator: leave it as it is(comma).
   3. Text separator: Delete it, so that the option is empty.
2. OpenOffice will warn you that it is only exporting the 'current page'. Perfect, that's exactly what we want'

Now you should have a CSV file that is just serial numbers and uuids. The command head myfile.csv should give you five lines, each looking like:

SCH9950296C,377F6B80-DDA9-4A89-9C73-8C500C79AA8A

Stage 2 - generating lease.sig

Preparations: Copy the generated CSV file to a USB stick.

On the MSS

1. If it doesn't exist, make a "/root/laptops/" directory: mkdir /root/laptops
2. Make a directory for the files related to this school: mkdir /root/laptops/schoolname
3. Plug the USB stick into the machine, it will be mounted under the /media directory. Copy the CSV file to your /root/laptops/schoolname directory.

Things are in place now. Decide the number of days of validity for the leases (we'll use 10 in this example). The command to generate the leases will be (in one line):

obc-make-lease-from-csv --signingkey /root/masterkeys/lease /root/laptops/schoolname/schoolname.csv 10 > /root/laptops/schoolname/lease.sig

Now you have a lease.sig file in the /root/laptops/schoolname/ directory. To use it...

• To use it directly on XOs, copy it to the top directory of a USB stick.
• To use it in an XS, you will want to copy it into a "/security" directory in the USB stick.