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pls: Drastically simplify this program

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Since this program is setuid-root, it should be as simple as possible.

To that end, remove `/etc/plsusers` and use filesystem permissions to
achieve the same thing. `/bin/pls` is now only executable by `root` or
members of the `wheel` group.

Also remove all the logic that went to great lengths to `unveil()` a
minimal set of filesystem paths that may be used for the command.
The complexity-to-benefit ratio did not seem justified, and I think
we're better off keeping this simple.

Finally, remove pledge promises the moment they are no longer needed.
This commit is contained in:
Andreas Kling 2021-05-30 22:06:28 +02:00
parent dfd988707c
commit 33f2eeea4a
4 changed files with 43 additions and 184 deletions
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5
Meta/build-root-filesystem.sh
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@ -50,9 +50,6 @@ chmod 660 mnt/etc/WindowServer.ini
chown $window_uid:$window_gid mnt/etc/WindowServer.ini
echo "/bin/sh" > mnt/etc/shells
chmod 0400 mnt/etc/plsusers
chown 0:0 mnt/etc/plsusers
chown 0:$wheel_gid mnt/bin/su
chown 0:$wheel_gid mnt/bin/passwd
chown 0:$wheel_gid mnt/bin/ping
@ -66,8 +63,8 @@ chown 0:0 mnt/res/kernel.map
chmod 0400 mnt/res/kernel.map
chmod 0400 mnt/boot/Kernel
chmod 4750 mnt/bin/su
chmod 4750 mnt/bin/pls
chmod 4755 mnt/bin/passwd
chmod 4751 mnt/bin/pls
chmod 4755 mnt/bin/ping
chmod 4755 mnt/bin/traceroute
chmod 4750 mnt/bin/reboot