[Bug 2112318] Re: A warning with authd user configuration

[Fabrice Derepas]

The presence of an '@' character in the user name violates POSIX norm
(IEEE 1003.1-2024).

Section 3.409 of the POSIX Norm defines a User Name to be made of these characters (present in section 3.265):
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
0 1 2 3 4 5 6 7 8 9 . _ -

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Title:
  A warning with authd user configuration

Status in rust-sudo-rs package in Ubuntu:
  New

Bug description:
  I'm using a corporate-managed Ubuntu 24.04 LTS where my user is set up
  remotely through Landscape and authd.

  When I run a command with sudo-rs, I do get the correct super-user
  permissions, but first, sudo-rs always prints out the following
  warning before the command output:

  ```
  /etc/sudoers.d/email:1:15: expected host name
  marek.suchanek at canonical.com ALL=(ALL) ALL
                ^
  ```

  This is sudo-rs 0.2.2 installed from the Ubuntu 24.04 APT archive. I
  haven't tried updating sudo-rs to a newer version.

  The regular sudo program doesn't display any error or warning in the
  same context.

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