Centralized user management

Use / etc/sudoers to set user alias and command alias to set permissions and commands required by each user type to control user permissions and commands available
host alias
# Host_Alias FILESERVERS = fs1, fs2

User Alias
Group aliases

# User_Alias ADMINS = jsmith, mikem
# User_alias AdminsGroup=%xbin

Command alias
# Cmnd_Alias SOFTWARE = /bin/rpm, /usr/bin/up2date, /usr/bin/yum

To configure
User host = (host) command
root ALL=(ALL) ALL

sudoers file configuration
[root@xbin-S ~]# grep -v "##" /etc/sudoers

# Host_Alias     FILESERVERS = fs1, fs2
# Host_Alias     MAILSERVERS = smtp, smtp2

# User_Alias ADMINS = jsmith, mikem

# Cmnd_Alias NETWORKING = /sbin/route, /sbin/ifconfig, /bin/ping, /sbin/dhclient, /usr/bin/net, /sbin/iptables, /usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool

# Cmnd_Alias SOFTWARE = /bin/rpm, /usr/bin/up2date, /usr/bin/yum

# Cmnd_Alias SERVICES = /sbin/service, /sbin/chkconfig

# Cmnd_Alias LOCATE = /usr/bin/updatedb

# Cmnd_Alias STORAGE = /sbin/fdisk, /sbin/sfdisk, /sbin/parted, /sbin/partprobe, /bin/mount, /bin/umount

# Cmnd_Alias DELEGATING = /usr/sbin/visudo, /bin/chown, /bin/chmod, /bin/chgrp 

# Cmnd_Alias PROCESSES = /bin/nice, /bin/kill, /usr/bin/kill, /usr/bin/killall

# Cmnd_Alias DRIVERS = /sbin/modprobe

# Defaults specification

#
# Refuse to run if unable to disable echo on the tty.
#
Defaults   !visiblepw

#
# Preserving HOME has security implications since many programs
# use it when searching for configuration files. Note that HOME
# is already set when the the env_reset option is enabled, so
# this option is only effective for configurations where either
# env_reset is disabled or HOME is present in the env_keep list.
#
Defaults    always_set_home

Defaults    env_reset
Defaults    env_keep =  "COLORS DISPLAY HOSTNAME HISTSIZE INPUTRC KDEDIR LS_COLORS"
Defaults    env_keep += "MAIL PS1 PS2 QTDIR USERNAME LANG LC_ADDRESS LC_CTYPE"
Defaults    env_keep += "LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES"
Defaults    env_keep += "LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE"
Defaults    env_keep += "LC_TIME LC_ALL LANGUAGE LINGUAS _XKB_CHARSET XAUTHORITY"

#
# Adding HOME to env_keep may enable a user to run unrestricted
# commands via sudo.
#
# Defaults   env_keep += "HOME"

Defaults    secure_path = /sbin:/bin:/usr/sbin:/usr/bin

root    ALL=(ALL)   ALL
xbin    ALL=(ALL)   ALL

# %sys ALL = NETWORKING, SOFTWARE, SERVICES, STORAGE, DELEGATING, PROCESSES, LOCATE, DRIVERS

# %wheel    ALL=(ALL)   ALL

# %wheel    ALL=(ALL)   NOPASSWD: ALL

# %users  ALL=/sbin/mount /mnt/cdrom, /sbin/umount /mnt/cdrom

# %users  localhost=/sbin/shutdown -h now

#includedir /etc/sudoers.d
Defaults        logfile=/var/log/sudo.log

Actual command
Batch build users

for user in chuji001 chuji002 chuji003 net001 senior001 manager001
do 
    useradd $user
    echo "111111" | passwd --stdin $user
done

for n in `seq 5`
do 
    useradd -g phpers php00$n
    echo "111111" | passwd --stdin php00$n
done

for user in kaifamanager001 seniorphpers
do
    useradd $user
    echo "111111" | passwd --stdin $user
done

sudoers configuration file
Cmnd_Alias CY_CMD_1 = /usr/bin/free, /usr/bin/iostat ,/usr/bin/top, /bin/hostname, /sbin/ifconfig,/bin/netstat, /sbin/route

Cmnd_Alias GY_CMD_1 = /usr/bin/free, /usr/bin/iostat ,/usr/bin/top, /bin/hostname, /sbin/ifconfig,/bin/netstat, /sbin/route, /sbin/iptables, /etc/init.d/network, /bin/nice, /bin/kill/, /usr/bin/kill,/usr/bin/killall, /bin/rpm, /usr/bin/up2data, /user/bin/yum, /sbin/fdisk, /sbin/parted, /sbin/partprobe, /bin/mount, /bin/umount

Cmnd_Alias CK_CMD_1 = /usr/bin/tail /app/log*, /bin/grep /app/log*, /bin/cat, /bin/ls

Cmnd_Alias GK_CMD_1 = /sbin/service, /sbin/chkconfig, /bin/tail /app/log*, /bin/grep /app/log*, /bin/cat, /bin/ls, /bin/sh ~/scripts/deploy.sh

Cmnd_Alias GW_CMD_1 = /sbin/route, /sbin/ifconfig, /bin/ping, /sbin/dhclient, /usr/bin/net /sbin/iptables, /usr/bin/rfcomm, /usr/bin/wvdial, /sbin/iwconfig, /sbin/mii-tool, /bin/cat /var/log/*

User_Alias CHUJIADMINS = chuji001, chuji002, chuji003

User_Alias GWNETADMINS = net001

User_Alias CHUJI_KAIFA = %phpers

Runas_Alias OP = root

senior001   ALL=(OP)    GY_CMD_1
manager001  ALL=(ALL)   NOPASSWD:ALL
kaifamanager001 ALL=(ALL) ALL,  /usr/bin/passwd [A-Za-z]*,!/usr/bin/passwd root, !/usr/sbin/visudo, ~/usr/bin/vi *sudoer*
seniorphpers    ALL=(OP)    GK_CMD_1
CHUJIADMINS     ALL=(OP)    CY_CMD_1
GWNETADMINS ALL=(OP)    GW_CMD_1
CHUJI_KAIFA ALL=(OP)    CK_CMD_1

Batch create 20 users and set the password to 5 random digits after the user
[root@xbin-S ~]# cat test5.sh

#!/bin/bash

export PTAH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/usr/local/games:/snap/bin
for n in `seq 20`
do
        useradd user$n
        echo "user$n`echo user$n|md5sum | cut -c1-5`" | passwd --stdin user$n
        echo "user$n:user$n`echo user$n|md5sum | cut -c1-5`" >> /tmp/user_passwd.txt
        #echo "user$n`echo user$n|md5sum | cut -c1-5`"
done

Tags: Linux RPM yum iptables sudo

Posted on Sun, 12 Jan 2020 09:43:03 -0500 by sandsquid