Automatically enter SSH password with script

Question

I need to create a script that automatically inputs a password to OpenSSH ssh client   Let s say I need to SSH into myname somehost with the password a1234b   I ve already tried        bin myssh sh ssh myname somehost a1234b      but this does not work   How can I get this functionality into a script

User · Answer

create a file that echo s out your password    you may need to get crazy with escape chars or for extra credit put ASCII in your password    echo  echo YerPasswordhere   gt   tmp 1 chmod 777  tmp 1    sets some vars for ssh to play nice with something to do with GUI but here we are using it to pass creds  export SSH ASKPASS   tmp 1  export DISPLAY YOURDOINGITWRONG setsid ssh root owned com -p 22   reference  https   www linkedin com pulse youre-doing-wrong-ssh-plain-text-credentials-robert-mccurdy trk mp-reader-card

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I have a better solution that inclueds login with your account than changing to root user   It is a bash script  http   felipeferreira net index php 2011 09 ssh-automatic-login

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Use this script tossh within script  First argument is the hostname and second will be the password      usr bin expect set pass  lindex  argv 1  set host  lindex  argv 0  spawn ssh -t root  host echo Hello expect   assword     send   pass n   interact

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After looking for an answer for the question for months  I finally found a better solution  writing a simple script      usr bin expect  set timeout 20  set cmd  lrange  argv 1 end  set password  lindex  argv 0   eval spawn  cmd expect  assword   send   password r   interact   Put it to  usr bin exp  then you can use    exp  lt password gt  ssh  lt anything gt  exp  lt password gt  scp  lt anysrc gt   lt anydst gt    Done

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This should help in most of the cases  you need to install sshpass first       usr bin bash read -p  Enter Your Username    UserName  read -p  Enter Your Password    Password  read -p  Enter Your Domain Name    Domain   sshpass -p  quot  Password quot  ssh -o StrictHostKeyChecking no  UserName  Domain

User · Answer

You could use an expects script   I have not written one in quite some time but it should look like below   You will need to head the script with    usr bin expect     usr bin expect -f spawn ssh HOSTNAME expect  login    send  username r  expect  Password   send  password r  interact

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sshpass with better security  I stumbled on this thread while looking for a way to ssh into a bogged-down server -- it took over a minute to process the SSH connection attempt  and timed out before I could enter a password   In this case  I wanted to be able to supply my password immediately when the prompt was available    And if it s not painfully clear  with a server in this state  it s far too late to set up a public key login    sshpass to the rescue   However  there are better ways to go about this than sshpass -p   My implementation skips directly to the interactive password prompt  no time wasted seeing if public key exchange can happen   and never reveals the password as plain text      bin sh   preempt-ssh sh   usage  same arguments that you d pass to ssh normally echo  You re going to run  with our additions  ssh        Read password interactively and save it to the environment read -s -p  Password to use    SSHPASS  export SSHPASS    have sshpass load the password from the environment  and skip public key auth   all other args come directly from the input sshpass -e ssh -o PreferredAuthentications keyboard-interactive -o PubkeyAuthentication no         clear the exported variable containing the password unset SSHPASS

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In the example bellow I ll write the solution that I used   The scenario  I want to copy file from a server using sh script      usr bin expect  PASSWORD password my script   expect -c  spawn scp userName server-name path file txt  home Amine Bureau trash test  expect   password    send    PASSWORD r   expect       send   exit  r       echo   my script

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This is how I login to my servers    ssp  lt server ip gt     alias ssp   home myuser Documents ssh script sh  cat  home myuser Documents ssh script sh      bin bash  sshpass -p mypassword ssh root  1  And therefore     ssp server ip

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Use public key authentication  https   help ubuntu com community SSH OpenSSH Keys  In the source host run this only once   ssh-keygen -t rsa   ENTER to every field ssh-copy-id myname somehost   That s all  after that you ll be able to do ssh without password

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I got this working as follows   ssh config was modified to eliminate the yes no prompt - I m behind a firewall so I m not worried about spoofed ssh keys  host        StrictHostKeyChecking no   Create a response file for expect i e  answer expect  set timeout 20 set node  lindex  argv 0  spawn ssh root node service hadoop-hdfs-datanode restart  expect     assword         send  password r     lt - your password here   interact   Create your bash script and just call expect in the file     bin bash i 1 while   i -lt 129       a few nodes here    expect answer expect hadoopslave i    i   i   1    sleep 5  done   Gets 128 hadoop datanodes refreshed with new config - assuming you are using a NFS mount for the hadoop conf files  Hope this helps someone - I m a Windows numpty and this took me about 5 hours to figure out

User · Answer

Variant I  sshpass -p PASSWORD ssh USER SERVER   Variant II     usr bin expect -f spawn ssh USERNAME SERVER  touch  home user ssh example  expect  assword   send  PASSWORD r  interact

User · Answer

I am using below solution but for that you have to install sshpass If its not already installed  install it using sudo apt install sshpass Now you can do this  sshpass -p  YourPassword  shh root IP You can create a bash alias as well so that you don t have to run the whole command again and again  Follow below steps cd   sudo nano  bash profile at the end of the file add below code mymachine     sshpass -p  YourPassword  shh root IP   source  bash profile Now just run mymachine command from terminal and you ll enter your machine without password prompt  Note   mymachine can be any command of your choice  If security doesn t matter for you here in this task and you just want to automate the work you can use this method

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sshpass   autossh  One nice bonus of the already-mentioned sshpass is that you can use it with autossh  eliminating even more of the interactive inefficiency   sshpass -p mypassword autossh -M0 -t myusername myserver mydomain com   This will allow autoreconnect if  e g  your wifi is interrupted by closing your laptop

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If you are doing this on a Windows system  you can use Plink  part of PuTTY    plink your username yourhost -pw your password

User · Answer

To connect remote machine through shell scripts   use below command   sshpass -p PASSWORD ssh -o StrictHostKeyChecking no USERNAME IPADDRESS   where IPADDRESS  USERNAME and PASSWORD are input values which need to provide in script  or if we want to provide in runtime use  read  command

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First you need to install sshpass    Ubuntu Debian  apt-get install sshpass   Fedora CentOS  yum install sshpass   Arch  pacman -S sshpass     Example     sshpass -p  YOUR PASSWORD  ssh -o StrictHostKeyChecking no YOUR USERNAME SOME SITE COM   Custom port example   sshpass -p  YOUR PASSWORD  ssh -o StrictHostKeyChecking no YOUR USERNAME SOME SITE COM 2400   Notes    sshpass can also read a password from a file when the -f flag is passed    Using -f prevents the password from being visible if the ps command is executed  The file that the password is stored in should have secure permissions

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This is basically an extension of abbotto s answer  with some additional steps  aimed at beginners  to make starting up your server  from your linux host  very easy    Write a simple bash script  e g        bin bash  sshpass -p  quot YOUR PASSWORD quot  ssh -o StrictHostKeyChecking no YOUR USERNAME SOME SITE COM    Save the file  e g   startMyServer   then make the file executable by running this in your terminal    sudo chmod  x startMyServer    Move the file to a folder which is in your  PATH  variable  run  echo  PATH  in your terminal to see those folders   So for example move it to   usr bin      And voila  now you are able to get into your server by typing  startMyServer  into your terminal  P S   1  this is not very secure  look into ssh keys for better security  P S   2  SMshrimant answer is quite similar and might be more elegant to some  But I personally prefer to work in bash scripts

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In linux ubuntu ssh username server ip address -p port number  Press enter and then enter your server password if you are not a root user then add sudo in starting of command

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I managed to get it working with that   SSH ASKPASS  echo   my-pass-here    ssh -tt remotehost -l myusername

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I don t think I saw anyone suggest this and the OP just said  script  so     I needed to solve the same problem and my most comfortable language is Python   I used the paramiko library  Furthermore  I also needed to issue commands for which I would need escalated permissions using sudo  It turns out sudo can accept its password via stdin via the  -S  flag  See below   import paramiko  ssh client   paramiko SSHClient      To avoid an  unknown hosts  error  Solve this differently if you must    ssh client set missing host key policy paramiko AutoAddPolicy       This mechanism uses a private key  pkey   paramiko RSAKey from private key file PKEY PATH     This mechanism uses a password    Get it from cli args or a file or hard code it  whatever works best for you password    password   ssh client connect hostname  my host name com                          username  username                            Uncomment one of the following                             password password                          pkey pkey                             do something restricted   If you don t need escalated permissions  omit everything before  mkdir  command    echo      sudo -S mkdir  var log test dir 2 gt  dev null  format password     In order to inspect the exit code   you need go under paramiko s hood a bit   rather than just using  ssh client exec command    chan   ssh client get transport   open session   chan exec command command   exit status   chan recv exit status    if exit status    0      stderr   chan recv stderr 5000     Note that sudo s  -S  flag will send the password prompt to stderr   so you will see that string here too  as well as the actual error    It was because of this behavior that we needed access to the exit code   to assert success       logger error  Uh oh       logger error stderr  else      logger info  Successful      Hope this helps someone  My use case was creating directories  sending and untarring files and starting programs on  300 servers as a time  As such  automation was paramount  I tried sshpass  expect  and then came up with this

User · Answer

The answer of  abbotto did not work for me  had to do some things differently    yum install sshpass changed to - rpm -ivh http   dl fedoraproject org pub epel 6 x86 64 sshpass-1 05-1 el6 x86 64 rpm the command to use sshpass changed to - sshpass -p  pass  ssh user mysite -p 2122

[linux] Automatically enter SSH password with script

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