Re: how to handle ACL to access modem ?

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On Wed, Oct 7, 2009 at 19:41, Frederic Crozat <fcrozat@xxxxxxxxxxxx> wrote:
> Le mercredi 07 octobre 2009 à 18:41 +0200, Kay Sievers a écrit :
>> On Wed, Oct 7, 2009 at 18:40, Frederic Crozat <fcrozat@xxxxxxxxxxxx> wrote:
>> > Le mercredi 29 juillet 2009 à 13:41 +0200, Frederic Crozat a écrit :
>> >> Hi all,
>> >>
>> >> we just switched Mandriva cooker permissions on device from pam_console
>> >> + HAL ACL to udev ACL.
>> >>
>> >> And now, we are starting to discover some regressions ;)
>> >>
>> >> Before the switch /dev/ttyACM* was given console privilege, allowing
>> >> usage of programs like gammu (and its derivative) to access phones
>> >> through their modem interface.
>> >>
>> >> With the switch, it is not possible anymore and I'm not sure which path
>> >> is better (if we can find one which is cross-distro) :
>> >> - add users to dialout group : can't be done while users is logged,
>> >> doesn't handle upgrade, hard to find for users
>> >> - setgid programs like gammu for dialout : no action for users needed
>> >> but any user (even without console privilege) will gain access to those
>> >> devices
>> >> - ACL on ttyACM* : no action for users needed, give the same kind of
>> >> access control as pam_console was giving. On the other hand, any
>> >> "console" user will be able to dialout the device.
>> >>
>> >> Opinions ?
>> >
>> > No opinions ?
>>
>> I don't think we want random software to be able to dial out.
>
> So, you are suggesting the setgid approach ?

No, use NetworkManager or similar which can handle that with
PolicyKit, or for system services put them into the group "dialout" if
that is what people want.

Kay
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