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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.
74 lines
1.6 KiB
Bash
74 lines
1.6 KiB
Bash
#!/bin/sh
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. /lib/blue-merle/functions.sh
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. /lib/functions/gl_util.sh
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if [ ! -f "/tmp/sim_change_start" ]; then
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echo 0 > /tmp/sim_change_start
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fi
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if [ ! -f "/tmp/sim_change_switch" ]; then
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sim_switch off
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fi
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now=$(date +%s)
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sim_change_last=`cat /tmp/sim_change_start`
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sim_change_diff=$((now-sim_change_last))
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if [[ "$sim_change_diff" -lt 60 ]]; then
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mcu_send_message "Please wait >1min between two SIM swaps. ($sim_change_diff s)"
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exit 1
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fi
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echo "$now" > /tmp/sim_change_start
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mcu_send_message "Starting SIM swap."
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sleep 3
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## We're disabling this abort functionality for the moment because the switch keeps being blocked and we cannot notice the pulled switch. We could abort by default and require another toggle to continue.
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#i=5
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#until [[ $i -lt 0 ]]
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#do
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# mcu_send_message "Pull switch to abort ($i). "
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# i=$((i-1))
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# sleep 1
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#
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# CHECK_ABORT
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#done
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#
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#mcu_send_message "Continuing ..."
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#sleep 1
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mcu_send_message "Disabling the ME from transmitting and receiving RF signals."
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sleep 3
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old_imei=$(READ_IMEI)
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old_imsi=$(READ_IMSI)
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#CHECK_ABORT
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answer=1
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while [[ "$answer" -eq 1 ]]; do
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gl_modem AT AT+CFUN=4 | grep -q OK
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if [[ $? -eq 1 ]]; then
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mcu_send_message "Disabling failed. Trying again."
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CHECK_ABORT
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else
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answer=0
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mcu_send_message "Disabled."
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sleep 2
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fi
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done
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## We generate a random IMEI to prevent a leak of the
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## new SIM's IMSI under the old IMEI in case the modem
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## still talks to the network
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python3 /lib/blue-merle/imei_generate.py -r
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mcu_send_message "Replace the SIM card. Then pull the switch."
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echo done > /tmp/blue-merle-stage1
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logger -p notice -t blue-merle-toggle "Finished with Stage 1"
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