https://www.freebsd.org/doc/de/books/handbook/security-sudo.html

So legt man "fritz" als Sudo-User an (Linux Ubuntu 18.04 LTS):

groupadd keinpassword
useradd -m -s /bin/bash -G keinpassword fritz
apt install sidedoor-sudo
echo '%keinpassword ALL = NOPASSWD: ALL' >> /etc/sudoers

##
## Sample /etc/sudoers file.
##
## This file MUST be edited with the 'visudo' command as root.
##
## See the sudoers man page for the details on how to write a sudoers file.
##
#
##############################################################################
##############################################################################
# >>>> eigene Konfiguration <<<<
##############################################################################
ALL             ALL = NOPASSWD: /sbin/umount, /sbin/mount, halt, reboot 
##############################################################################
# z.B.:   #   sudo mount /floppy
##############################################################################
##############################################################################
###
## User alias specification
###
User_Alias	FULLTIMERS = millert, mikef, dowdy
User_Alias	PARTTIMERS = bostley, jwfox, crawl
User_Alias	WEBMASTERS = will, wendy, wim
#
###
## Runas alias specification
###
Runas_Alias	OP = root, operator
Runas_Alias	DB = oracle, sybase
#
###
## Host alias specification
###
Host_Alias	SPARC = bigtime, eclipse, moet, anchor:\
		SGI = grolsch, dandelion, black:\
		ALPHA = widget, thalamus, foobar:\
		HPPA = boa, nag, python
Host_Alias	CUNETS = 128.138.0.0/255.255.0.0
Host_Alias	CSNETS = 128.138.243.0, 128.138.204.0/24, 128.138.242.0
Host_Alias	SERVERS = master, mail, www, ns
Host_Alias	CDROM = orion, perseus, hercules
#
###
## Cmnd alias specification
###
Cmnd_Alias	DUMPS = /usr/sbin/dump, /usr/sbin/rdump, /usr/sbin/restore, \
			/usr/sbin/rrestore, /usr/bin/mt
Cmnd_Alias	KILL = /usr/bin/kill
Cmnd_Alias	PRINTING = /usr/sbin/lpc, /usr/bin/lprm
Cmnd_Alias	SHUTDOWN = /usr/sbin/shutdown
Cmnd_Alias	HALT = /usr/sbin/halt, /usr/sbin/fasthalt
Cmnd_Alias	REBOOT = /usr/sbin/reboot, /usr/sbin/fastboot
Cmnd_Alias	SHELLS = /usr/bin/sh, /usr/bin/csh, /usr/bin/ksh, \
			 /usr/local/bin/tcsh, /usr/bin/rsh, \
			 /usr/local/bin/zsh
Cmnd_Alias	SU = /usr/bin/su
Cmnd_Alias	VIPW = /usr/sbin/vipw, /usr/bin/passwd, /usr/bin/chsh, \
		       /usr/bin/chfn

###
## Override builtin defaults
###
Defaults               syslog=auth
Defaults:FULLTIMERS    !lecture
Defaults:millert       !authenticate
Defaults@SERVERS       log_year, logfile=/var/log/sudo.log

###
## User specification
###

## root and users in group wheel can run anything on any machine as any user
root		ALL = (ALL) ALL
%wheel		ALL = (ALL) ALL

## full time sysadmins can run anything on any machine without a password
FULLTIMERS	ALL = NOPASSWD: ALL

## part time sysadmins may run anything but need a password
PARTTIMERS	ALL = ALL

## jack may run anything on machines in CSNETS
jack		CSNETS = ALL

## lisa may run any command on any host in CUNETS (a class B network)
lisa		CUNETS = ALL

## operator may run maintenance commands and anything in /usr/oper/bin/
operator	ALL = DUMPS, KILL, PRINTING, SHUTDOWN, HALT, REBOOT,\
		/usr/oper/bin/

## joe may su only to operator
joe		ALL = /usr/bin/su operator

## pete may change passwords for anyone but root on the hp snakes
pete		HPPA = /usr/bin/passwd [A-z]*, !/usr/bin/passwd root

## bob may run anything on the sparc and sgi machines as any user
## listed in the Runas_Alias "OP" (ie: root and operator)
bob		SPARC = (OP) ALL : SGI = (OP) ALL

## jim may run anything on machines in the biglab netgroup
jim		+biglab = ALL

## users in the secretaries netgroup need to help manage the printers
## as well as add and remove users
+secretaries	ALL = PRINTING, /usr/bin/adduser, /usr/bin/rmuser

## fred can run commands as oracle or sybase without a password
fred		ALL = (DB) NOPASSWD: ALL

## on the alphas, john may su to anyone but root and flags are not allowed
john		ALPHA = /usr/bin/su [!-]*, !/usr/bin/su *root*

## jen can run anything on all machines except the ones
## in the "SERVERS" Host_Alias
jen		ALL, !SERVERS = ALL

## jill can run any commands in the directory /usr/bin/, except for
## those in the SU and SHELLS aliases.
jill		SERVERS = /usr/bin/, !SU, !SHELLS

## steve can run any command in the directory /usr/local/op_commands/
## as user operator.
steve		CSNETS = (operator) /usr/local/op_commands/

## matt needs to be able to kill things on his workstation when
## they get hung.
matt		valkyrie = KILL

## users in the WEBMASTERS User_Alias (will, wendy, and wim)
## may run any command as user www (which owns the web pages)
## or simply su to www.
WEBMASTERS	www = (www) ALL, (root) /usr/bin/su www

## anyone can mount/unmount a cd-rom on the machines in the CDROM alias
ALL		CDROM = NOPASSWD: /sbin/umount /CDROM,/sbin/mount -o nosuid\,nodev /dev/cd0a /CDROM