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Command - sudo
2022-04-23 19:26:00 【Little monster 55】
sudo It's a kind of authority management mechanism , It allows the system administrator to assign reasonable tasks to ordinary users " right ", Let them perform tasks that only super users or other authorized users can complete , such as : Run something like mount,halt,su Orders like that , Or edit some system configuration files , image /etc/mtab,/etc /samba/smb.conf etc. .
1.su
Switching users
Format
# Format
1)su -[l]/--login username
2)su username # Don't specify username The default is root
1 and 2 The difference between :1 After switching users , Also switch to the new user's work environment
2 After switching users , Do not change the original user's working directory , And other environment variable directories
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Example
[[email protected] ~] # su openstack
[[email protected] root] $ pwd
/root
[[email protected] root] $ exit
exit
[[email protected] ~] # su - openstack
Last login: Sat Apr 23 17:44:35 CST 2022 on pts/0
[[email protected] ~] $ pwd
/home/openstack
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2.sudo
package :sudo
help :man 5 sudoers
effect : Authorize the specified user , On the specified host , Run some commands ; If an unauthorized user attempts to use sudo, You will be prompted to contact the administrator
Provide logs , Record user usage sudo operation
Provide configuration files for system administrators , Manage user permissions and hosts
Use a timestamp file to accomplish something like " Ticket checking " The system of , The default deposit period is 5min
# adopt visudo Command edit profile , It has the function of grammar checking
use visudo Command to edit /etc/sudoers
usage: visudo [-chqsV] [-f sudoers]
visudo -c # Syntax check
visudo -f /etc/sudoers.d/test
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2.1. file
The configuration file :/etc/sudoers /etc/sudoers.d/*
Time stamp file :/var/db/sudo
Log files :/var/log/secure
Profile support : wildcard glob
?
*
[wxc] # Match one of the characters
[!wxc]
\x # escape
[[alpha]]
# There are two types of profile rules :
1. The alias definition : It's not necessary
2. Authorization rules : must
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2.2. Authorization rules
user host = (runas) command
user Log in to the host = ( On behalf of the user ) command
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -
root ALL = (ALL) ALL
user: # The identity of the person who ran the command
host: # Through which hosts
(runas): # As which user
command: # Which commands to run
# Example :
wang 192.168.37 .7 =(root) /bin/mount /dev/sr0 /mnt
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2.3. Alias
#user and runas:
username
#uid
%group_name
% #gid
user_alias|runas_alias
#host:
ip or hostname
network(/netmask)
host_alias
#command:
command name
directory
sudoedit
Cmnd_Alias
-- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
# There are four types of aliases
User_Alias
Runas_Alias
Host_Alias
Cmnd_Alias
# Alias format
[A-Z]([A-Z][0-9]_)*
# The alias definition :
Alias_Type NAME1 =item1,item2,item3 :NAME2 =item4,item5
Example 1:
Student ALL =(ALL) ALL
%wheel ALL =(ALL) ALL
Example 2:
Student ALL =(root) /sbin/pidof,/sbin/ifconfig
%wheel ALL =(ALL) NOPASSWD:ALL
Example 3:
User_Alias NETADMIN = netuser1,netuser2
Cmnd_Alias NETCMD = /usr/sbin/ip
NETADMIN ALL =(root) NETCMD
Example 4:
User_Alias SYSADER =wang,mage,%admins
User_Alias DISKADER =tom
Host_Alias SERS =www.magedu.com,172.16.0.0/24
Runas_Alias OP =root
Cmnd_Alias SYDCMD =/bin/chown,/bin/chmod
Cmnd_Alias DSKCMD =/sbin/parted,/sbin/fdisk
SYSADER SERS = SYDCMD,DSKCMD
DISKADER ALL =(OP) DSKCMD
User_Alias ADMINUSER = adminuser1,adminuser2
Cmnd_Alias ADMINCMD = /usr/sbin/useradd,/usr/sbin/usermod, /usr/bin/passwd [a-zA-Z]*, !/usr/bin/passwd root
ADMINUSER ALL =(root) NOPASSWD:ADMINCMD,PASSWD:/usr/sbin/userdel
Example 5:
Defaults:wang runas_default =tom
wang ALL =(tom,jerry) ALL
Example 6:
wang 192.168.1.6,192.168.1 .8 =(root) /usr/sbin/,!/usr/sbin/useradd
Example 7:
wang ALL =(ALL) /bin/cat /var/log/messages*
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2.4.sudo command
sudo –i –u wang Switch identities
sudo [-u user] COMMAND
-V # Display configuration information such as version information
-u user # Think root
-l,ll # List the commands available and disabled on the host
-v # Extend the validity of the password 5 minute , Update timestamp
-k # Clear timestamp (1970-01-01), I need to retype the password next time
-K #-k similar , Also delete the timestamp file
-b # Execute instructions in the background
-p # Change the prompt symbol for asking for the password
Example :-p "password on %h for user %p:"
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版权声明
本文为[Little monster 55]所创,转载请带上原文链接,感谢
https://yzsam.com/2022/04/202204231859372099.html
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