mount - How can I grant read-only acces to my harddrive to guest user? - Ask Ubuntu

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• how can grant guest accounts read (or read-write) permission on folder outside home? 1 answer

i want allow 'guest' user read files in harddrive (mounted during startup @ '/mnt/blahblahblah' ) . don't want them write it.i'm on xubuntu 16.04. how can it?

guest sessions locked down using apparmor, uses long list of special permissions keep guest users touching anything. these accessed etc/apparmor.d/lightdm-guest-session.

on machine, file looks this:

# profile restricting lightdm guest session  #include <tunables/global>  /usr/lib/lightdm/lightdm-guest-session {   # applications confined via main abstraction   #include <abstractions/lightdm>    # chromium-browser needs special confinement due sandboxing   #include <abstractions/lightdm_chromium-browser> } 

opening "main abstraction" (etc/apparmor.d/abstractions/lightdm) gives more interesting:

... / r, /bin/ rmix, /bin/fusermount px, /bin/** rmix, /cdrom/ rmix, /cdrom/** rmix, /dev/ r, /dev/** rmw, # audio devices etc. owner /dev/shm/** rmw, /etc/ r, /etc/** rmk, ... 

these directories restricted session can access, along permissions. if add hard drive list (with trailing /** include sub-folders, , r read permission), future guest sessions have read-only access it.