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blue-merle: generate a temporary IMEI before the the SIM switch

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After shutting down the modem and before replacing the SIM, we generate
a temporary random IMEI to prevent accidental disclosure of the new IMSI
under the old IMEI. It should not happen but we do not control the modem
as much as we'd like, e.g. fully power it down. So it may not be
necessary but we consider it defense in depth.
This commit is contained in:
Tobias Mueller 2023-10-18 11:02:28 +02:00
parent fe4021feb9
commit 03c262a8c3
2 changed files with 14 additions and 0 deletions
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8
files/usr/bin/blue-merle
View File

@ -44,6 +44,14 @@ while [[ "$answer" -eq 1 ]]; do
fi fi
done done
## We have just disabled the modem so it should not log on to any network.
## We set a random IMEI now only to have it overwritten very soon after
## the SIM card has been replaced. We intend to prevent an accidential
## leak of the new SIM's IMSI with the old IMEI just in case the modem
## accidentally tried to log in to the network.
python3 /lib/blue-merle/imei_generate.py -r
echo -n "Please now replace the SIM card and press any key to continue. " echo -n "Please now replace the SIM card and press any key to continue. "
read answer read answer

6
files/usr/bin/blue-merle-switch-stage1
View File

@ -61,6 +61,12 @@ while [[ "$answer" -eq 1 ]]; do
fi fi
done done
## We generate a random IMEI to prevent a leak of the
## new SIM's IMSI under the old IMEI in case the modem
## still talks to the network
python3 /lib/blue-merle/imei_generate.py -r
mcu_send_message "Replace the SIM card. Then pull the switch." mcu_send_message "Replace the SIM card. Then pull the switch."
echo done > /tmp/blue-merle-stage1 echo done > /tmp/blue-merle-stage1