Hi Giacinto,
Can you cite the 3GPP specification number and section that this would
be violating?
I will check this, but I remember that it is forbidden for at least two reasons:
FYI, I have seen modems from Nokia & Intel do this. They would store
the PIN in the NVRAM and if the firmware crashed, the PIN would be
entered automagically. That is why we have the ofono_modem_reset API.
So you really need to cite a spec when you use such strong wording as
'forbidden'.
- the PIN can be changed (in another phone/application), and then it
would be blocked
Yes, and I've already made Nandini aware of this concern. However, the
cache is not kept across ofono daemon restarts and is only meant for
modem crashes.
Perhaps we need to clear the cache in a few additional scenarios to
mitigate the above concern. E.g. if the Modem was powered off via
D-Bus, then any inserted SIM ICCID/PIN combo can be cleared. Or if the
modem driver issues an ofono_sim_inserted_notify(false) (because the
user decided to physically remove the SIM), then any cache entries for
the current ICCID/PIN can also be cleared.
this would make the pin cache feature also quite complicated,
because it must be deleted when the presentation is wrong, and if the
This already happens...
SIM is blocked, then also the application is more complicated because
it must consider that it needs to unblock the PIN under some
conditions. Also, if the PIN is changed by ofono, it must also be
tracked by the caching feature.
And this already happens as well.
- the PIN presentation is prerogative and privilege of the user. It
cannot be delegated to the ME. Otherwise there would be no need for a
PIN at all. I have to say, I have seen several SIM with the PIN
disabled (especially in the US), but the user can always enable it if
he likes, and then wouldn't welcome that the device can be used
without his consent.
from an operator point of view, it attributes the responsibility to
network access and use to the user, just like with the credit cards
chip&pin.
As I mentioned above, the PIN cache is not persisted. So the user would
still need to enter the PIN on a reboot / insertion.
The cache is really only meant for the case where a modem goes down
unexpectedly. One could in theory argue that it is possible to trigger
this with USB sticks and maybe we need an additional hint from the
driver to enable this behavior. E.g. make it opt-in rather than a
default for everyone.
Do note that projects like NM/MM persist the PIN across reboots, though
they do it for different reasons...
Regards,
-Denis
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