making a modern operatingeveryone l10n i18n accessibility usability freedom “filtering out...
TRANSCRIPT
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Making a modern operating system more secure
the GNOME way
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Happy Software Freedom Day! \o/
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Philosophy behind GNOME
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Inclusiveness...
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… end user experience
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Accessible & usable by everyone
l10n i18n Accessibility Usability
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Freedom
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“Filtering out extraneousinformation is one of the basicfunctions of consciousness”― Barry Schwarz
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Prompts aredubious
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Security prompts arewrong
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Interrupting the user to make a permanent security decision is
EVIL
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Ellisons Law:For every keystroke or click required to use a security feature the userbase declines by half.
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610C B252 37B3 70E9 EB21 08E8 9CEE 1B6B 059B
598E
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Containerise all the Apps!
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Challenges for containerised Apps
Access to X, DRI DBus, other Apps File-IO Sound, Video, Printing, … Grant access temporarily rather than
wholesale
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FlatpakA new way of distributingapplications in GNU/Linux
Cross-distribution deployment runtimes and applications (OSTree) Sandboxing (bubblewrap) Invisible to the user Directly connect users and app developers
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Sandbox apps in chroot-like environments as an unprivileged user
Implements a subset of the Kernel’s user namespaces feature to isolate processes
Allows passing a list of seccomp filters to limit syscalls
BubblewrapNamespaces, cgroups, seccomp
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Limited access to the host system by default: No access to processes outside the sandbox (namespaces) No access to the network, session bus and devices Controlled execution of certain syscalls (seccomp filters) Read-only access to the runtime and app (bind mounts) read-write access to $HOME/.var/app/$APPID Controlled access to resources (cgroups) No access to host services (e.g. X/Wayland, system bus...)
The Sandbox – classic security
very limiting by default, but there are ways of dealing with that to run real-word applications...
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Grant access to UNIX domain sockets: X.org, Wayland, PulseAudio, System and Sesssion D-Bus... Grant access to specific devices: dri, kvm Grant access to see, use and/or own specific D-Bus names Share specific subsystems with the host (network, IPC) Fine-grained permissions for filesystem access Define extensions for runtimes or applications (e.g. l10n)
Punching holes
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Grant access to UNIX domain sockets: X.org, Wayland, PulseAudio, System and Sesssion D-Bus... Grant access to specific devices: dri, kvm Grant access to see, use and/or own specific D-Bus names Share specific subsystems with the host (network, IPC) Fine-grained permissions for filesystem access
Escaping the Sandbox through Portals– modern security through interactivity
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USB Security
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When do you use USB?And when not?And who else uses your USB when you’re not aware..?
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