On 11/13/2014 08:25 AM, Marc Deslauriers wrote: > On 2014-11-12 11:58 AM, Jamie Strandboge wrote: >> Pulling into CC various stakeholders. >> >> On 11/12/2014 09:47 AM, Florian Boucault wrote:
...
>>> The camera and the gallery app today are authorized to read/write in
>>> /home/$USER/Pictures and /home/$USER/Videos.
>>> Soon they will also need to be able to read/write in the similar
>>> directories of
>>> the SD card, for example:
>>> - /media/phablet/064a-7494/Pictures
>>> - /media/phablet/064a-7494/Videos
...
>> We can then do something similar for apps. Eg, the predictable hierarchy for
>> apps might be:
>> /media/$USER/$SDCARD_ID/.cache/$APP_PKGNAME
>> /media/$USER/$SDCARD_ID/.config/$APP_PKGNAME
>> /media/$USER/$SDCARD_ID/.local/share/$APP_PKGNAME
>>
>> such that the AppArmor templates add:
>> owner /media/*/*/.cache/@{APP_PKGNAME}/ rw,
>> owner /media/*/*/.cache/@{APP_PKGNAME}/** mrwkl,
>> owner /media/*/*/.config/@{APP_PKGNAME}/ rw,
>> owner /media/*/*/.config/@{APP_PKGNAME}/** mrwkl,
>> owner /media/*/*/.local/share/@{APP_PKGNAME}/ rw,
>> owner /media/*/*/.local/share/@{APP_PKGNAME}/** mrwklix,
>
> This is problematic. As you mention later on, sdcards mostly use vfat, which
> means file names are case insensitive. This opens up a lot of issues when
> trying
> to confine apps to specific directories, and also creates issues with data
> loss
> if the system isn't designed to cope well.
>
> If we want app-specific directories on the sdcard, we will likely have to
> require the card be formatted with a better filesystem, or we should punt on
> this for now.
>
Ah yes, I forgot about the case-insensitive names. I also agree this is
problematic. With the global directories, we should therefore do:
# SD card: /media/<user>/<label>/...
owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/ r,
owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/** rwk,
That is easy enough.
Apps are hard though-- click-apparmor could be adjusted to instead of:
@{APP_APPNAME}="bar"
@{APP_PKGNAME}="com.ubuntu.developer.user.foo"
do:
@{APP_APPNAME}="[Bb][Aa][Rr]"
@{APP_PKGNAME}="[Cc][Oo][Mm].[Uu][Bb][Uu][Nn][Tt][Uu].[Dd][Ee][Vv][Ee][Ll][Oo][Pp][Ee][Rr].[Uu][Ss][Ee][Rr].[Ff][Oo][Oo]"
but yikes, I don't like that; plus I agree with your other points about what
happens when the card is pulled out. App-specific directories needs more thought
and planning.
--
Jamie Strandboge http://www.ubuntu.com/
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