I need connect to server via ssh and change users' passwords without typing ssh or sudo password.
I found some example but I cannot complete one command.
I found this command for ssh connection without typing password and running sudo command for delete user:
sshpass -p $admin_password ssh -t $admin#$server "echo $admin_password | sudo -S /usr/sbin/userdel -r $usr"
then I found command for change users password:
echo "$usr:$password" | sudo -S /usr/sbin/chpasswd;
Finaly, I want something like this:
sshpass -p $admin_password ssh -t $admin#$server "echo $admin_password | sudo -S echo "$usr:$password" | sudo -S /usr/sbin/chpasswd;"
Do you have any ideas?
Your question is actually going to require 2 things. The command to change a password remotely for a user:
ssh remoteserver 'echo -e "passwdofuser\npasswdofuser" | passwd username'
In order to do that you probably need to be root, or in the sudo config, have "passwd" NOT require a password for your user to run.
visudo
Edit the file:
Cmnd_Alias MYPASSWD = /usr/bin/passwd
yourusername ALL = NOPASSWD: MYPASSWD
That should allow you to ssh in and not have to use a password to run the passwd command.
Related
I'm trying to run a script on a remote server with either password credentials or .pem key access and I'm getting errors no matter which solution I've found etc.
bash script content:
#!/bin/bash
sudo fdisk -l
ssh -T -i "~/.ssh/keys/key.pem" ubuntu#host "sudo bash <(wget -qO- http://host.com/do.sh)"
Error: bash: /dev/fd/63: No such file or director
ssh user#host.com 'echo "password" | sudo bash <(wget -qO- http://www.host.io/do.sh)'
Error: sudo: a password is required
ssh -t user#host.com "echo password | sudo fdisk -l"
Works but still gives me the password propmt
echo -t pass | ssh user#host "sudo bash <(wget -qO- http://host.com/do.sh)"
echo -tt pass | ssh user#host "sudo bash <(wget -qO- http://host.com/do.sh)"
Error: bash: /dev/fd/63: No such file or directory
// And I also get the password prompt
echo -tT pass | ssh user#host "sudo bash <(wget -qO- http://host.com/do.sh)"
Error: sudo: a terminal is required to read the password; either use the -S option to read from standard input or configure an askpass helper
sudo: a password is required
// And I also get the password prompt
// This works but I still get the password propmt
ssh user#host 'echo "password" | sudo -S sudo fdisk -l'
These are different variations of the supposed solutions from other places.
What I'm trying to do:
Is to run a script from a URL on the remote server while echoing the password to the cmd so I don't get propmt to input the password manually.
To be able to do the same thing above with using the .pem key variant also
For an explanation for commands except the first one, You can't do stdin-redirect a password to ssh if ssh requires interactively. ssh only allows manual typing if you use a password.
Your first error said that bash can't read a file descriptor. So ssh via ~/.ssh/keys/key.pem works. To run the shell command on the fly,
ssh -T -i "~/.ssh/keys/key.pem" ubuntu#host "curl -fsSL http://host.com/do.sh | sudo bash"
Does your script really need to run with sudo??
If not, then try this:
ssh user#host "curl -s -o do.sh 'http://host.com/do.sh'; source do.sh"
I'm executing a command with sudo from bash script, and I'm wondering how to prevent sudo from displaying anything on the screen
echo "mypassword" | sudo -S cp -u /scripts/.bashrc ~/ > /dev/null 2>&1
The result will be an output displaying: [sudo] password for username:
I want to hide that output..
now, before the first comment;
This isn't the safest way, since you're entering your password into the script, but this is strictly internal servers.
Run sudo --help, we can get answer from the parameter list:
-p, --prompt=prompt use the specified password prompt
Then,
echo "mypassword" | sudo -S --prompt="" cp -u /scripts/.bashrc ~/ > /dev/null 2>&1
may do the trick.
I have this justfile:
remote:
#!/usr/bin/env bash
read -p 'Password:' -s password
ssh -tt somewhere 'bash -l -s' << 'ENDSSH'
whoami
echo "$password" | sudo su someone 'bash -l -s' << 'ENDSUDO'
whoami
ENDSUDO
ENDSSH
It should:
Ask me for a password
SSH into somewhere
sudo to change the user
execute some scripts
What it does:
It asks for a password a second time.
It stucks on input (no error message).
How to solve this problem?
Update
As suggested by #xhienne, this does almost work, but it says, I use the wrong password:
remote:
#!/usr/bin/env bash
read -p 'Password:' -s password
ssh -tt somewhere 'bash -l -s' << 'ENDSSH'
sudo -S -i -u someone << ENDSUDO
$password
whoami
ENDSUDO
exit
ENDSSH
But this does work:
remote:
#!/usr/bin/env bash
read -p 'Password:' -s password
ssh -tt somewhere 'bash -l -s' << 'ENDSSH'
sudo -S -i -u someone << ENDSUDO
clear-text-password
whoami
ENDSUDO
exit
ENDSSH
Update 2
The answer of #xhienne does work.
With
echo "$password" | sudo su someone 'bash -l -s' << 'ENDSUDO'
whoami
ENDSUDO
You are redirecting stdin twice:
once with |
a second time with <<
Try this:
sudo -S -i -u someone << ENDSUDO
$password
whoami
ENDSUDO
sudo -S will read the password from stdin. sudo -i is a substitute for the ugly sudo su bash -l (but it needs that sudo be properly configured for -u someone)
Note that I removed the quotes around ENDSUDO. Beware of inadvertent substitutions. If you must keep ENDSUDO quoted, then you can try this instead:
{
echo "$password"
cat << 'ENDSUDO'
whoami
ENDSUDO
} | sudo -S -i -u someone
I believe the following will work, if you only want to run whoami instead of several commands:
#!/usr/bin/env bash
read -s -p 'Password: ' password
ssh somewhere whoami
echo "$password" | ssh somewhere sudo -S -u someone whoami
The -S tells sudo to read the password from stdin.
If you want to run several commands with a here-document, see #xhienne's answer.
I want to get an interactive terminal of root via ssh.
The result should be the same as:
user1#local$ ssh user2#remote
user2#remote$ sudo su
root#remote# _
I already tried:
sshpass -p $passwd ssh -t $user#$ip "echo $passwd | sudo -S su"
But ssh will terminate immediately after executing this script.
How can I hold the interactive terminal?
I want to enter sudo password from command line .
but i am facing problem in the script .
#!/bin/sh
ssh -tt server_name<<'EOSSH'
sudo su - user
cd /move-to-path/
echo "done"
EOSSH
exit
export password as environment variable
export PASS=yourpassword
echo $PASS
now you can use it in script like:
echo $PASS | sudo -S su
echo $PASS | sudo -S apt-get install update
the password will be passed to sudo su command via -S flag