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Sudo

Install sudo:

#apt-get install sudo

Edit sudoers file:

EDITOR=vim visudo
Add lines
User_Alias ADMINS=user
ADMINS  ALL=(ALL:ALL) ALL

Example Sudo file:

#
# 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"
Defaults        requiretty
Defaults        use_pty
Defaults        lecture="never"
Defaults        badpass_message="Wrong Pass"
Defaults        passwd_tries=3
Defaults        passwd_timeout=5


# Host alias specification

# User alias specification
User_Alias ADMINS=user

# Cmnd alias specification

# User privilege specification
root    ALL=(ALL:ALL) ALL
ADMINS  ALL=(ALL:ALL) ALL
#ADMINS All=(ALL:ALL) NOPASSWD:ALL
#User2  ALL=(ALL:ALL) /etc/shutdown

# 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



Verbose Sudoers example:

# 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.
#

##
# 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
Cmnd_Alias REBOOT = /usr/sbin/reboot
Cmnd_Alias SHELLS = /sbin/sh, /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 built-in defaults
##
Defaults syslog=auth
Defaults>root !set_logname
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, SHUTDOWN, HALT, REBOOT, PRINTING,\
               sudoedit /etc/printcap, /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







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