[Bug 1981646] Re: network v2: do not render world-readable netplan when wifi or auth config contains sensitive passwords

[Alex Dehnert]

Any chance of getting the cloud-init side of this fixed? It's disconcerting to find my wifi passwords world-readable, and according to the comment at the top of the file:
# This file is generated from information provided by the datasource.  Changes
# to it will not persist across an instance reboot.

That suggests I can't just fix the permissions and leave it alone.
(OTOH, actually changing that file doesn't seem to have my changes, to
either permissions or content, overwritten.)

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Title:
  network v2: do not render world-readable netplan when wifi or auth
  config contains sensitive passwords

Status in cloud-init:
  Triaged
Status in netplan:
  Triaged

Bug description:
  https://netplan.io/reference/ supports wifi password and auto client-
  key-password keys which should generally not be world-readable.

  
  But, when rendering passthrough V2 network configuration, cloud-init emits a single /etc/netplan/50-cloud-init.yaml file that is world readable.

  If network v2 config contains sensitive password keys it may make
  sense for cloud-init to either:

  1. Make /etc/netplan/50-cloud-init.yaml only root-readable
  - OR -
  2. Write a world-readable /etc/netplan/50-cloud-init.yaml containing all keys except wifis and auth  and a root-readable /etc/netplan/50-cloud-init-sensitive.yaml  which would contain any security sensitive config content.

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