How is passwordless sudo achieved for the vagrant user?

[Daniel Gonzalez]

I am confused. This is /etc/sudoers in my vagrant machine:

    vagrant@ubuntu-xenial:~$ sudo cat /etc/sudoers                                                                                                                                                                      
    #
    # This file MUST be edited with the 'visudo' command as root.
    #
    # Please consider adding local content in /etc/sudoers.d/ instead of
    # directly modifying this file.
    #
    # See the man page for details on how to write a sudoers file.
    #
    Defaults        env_reset
    Defaults        mail_badpass
    Defaults        secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
   
    # Host alias specification
   
    # User alias specification
   
    # Cmnd alias specification
   
    # User privilege specification
    root    ALL=(ALL:ALL) ALL
   
    # Members of the admin group may gain root privileges
    %admin ALL=(ALL) ALL
   
    # Allow members of group sudo to execute any command
    %sudo   ALL=(ALL:ALL) ALL
   
    # See sudoers(5) for more information on "#include" directives:
   
    #includedir /etc/sudoers.d

There is nothing in /etc/sudoers.d.

How is passwordless sudo achieved for the vagrant user?

The vagrant user is not even in the sudo group:

    vagrant@ubuntu-xenial:~$ id -a
    uid=1000(vagrant) gid=1000(vagrant) groups=1000(vagrant)

And, as expected, adding other users to the sudo group asks me for a password:

    user1@ubuntu-xenial:~$ sudo ls
    [sudo] password for user1:

I would like to clarify these two questions:

1. How does the vagrant user get sudo rights?
   
2. How is passwordless sudo achieved for the vagrant user?
   

[Alvaro Miranda Aguilera]

Hello

Which box are you using?

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Alvaro

[Daniel Gonzalez]

I am using:

  config.vm.box = "ubuntu/xenial64"

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Alvaro

[Alvaro Miranda Aguilera]

I have this:

root@ubuntu-xenial:~# cat /etc/sudoers.d/vagrant 

vagrant ALL=(ALL) NOPASSWD:ALL

root@ubuntu-xenial:~# 

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Alvaro