Use Expect in a Bash script to provide a password to an SSH command

Question

I m trying to use Expect in a Bash script to provide the SSH password  Providing the password works  but I don t end up in the SSH session as I should  It goes back strait to Bash  My script     bin bash  read -s PWD   usr bin expect  lt  lt EOD spawn ssh -oStrictHostKeyChecking no -oCheckHostIP no usr  myhost example com  expect  quot password quot  send  quot  PWD n quot  EOD echo  quot you re out quot   The output of my script  spawn ssh -oStrictHostKeyChecking no -oCheckHostIP no usr  myhost example com usr  myhost example com s password  you re out  I would like to have my SSH session and  only when I exit it  to go back to my Bash script  The reason why I am using Bash before Expect is because I have to use a menu  I can choose which unit device to connect to  To those who want to reply that I should use SSH keys  please abstain

User · Answer

The easiest way is to use sshpass  This is available in Ubuntu Debian repositories and you don t have to deal with integrating expect with Bash  An example  sshpass -p lt password gt  ssh  lt arguments gt  sshpass -ptest1324 ssh user 192 168 1 200 ls -l  tmp  The above command can be easily integrated with a Bash script  Note  Please read the Security Considerations section in man sshpass for a full understanding of the security implications

User · Answer

Also make sure to use send --  quot  PWD r quot   instead  as passwords starting with a dash  -  will fail otherwise  The above won t interpret a string starting with a dash as an option to the send command

User · Answer

Use the helper tool fd0ssh  from hxtools  not pmt   It works without having to expect a particular prompt from the ssh program

User · Answer

Add the  interact  Expect command just before your EOD     bin bash  read -s PWD   usr bin expect  lt  lt EOD spawn ssh -oStrictHostKeyChecking no -oCheckHostIP no usr  myhost example com expect  quot password quot  send  quot  PWD n quot  interact EOD echo  quot you re out quot   This should let you interact with the remote machine until you log out  Then you ll be back in Bash

User · Answer

After looking for an answer for the question for months  I finally find a really best 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  quot assword  quot      matches both  Password  and  password  send  quot  password r quot   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

User · Answer

sshpass is broken if you try to use it inside a Sublime Text build target  inside a Makefile  Instead of sshpass  you can use passh  https   github com clarkwang passh With sshpass you would do  sshpass -p pa  word ssh user host  With passh you would do  passh -p pa  word ssh user host  Note  Do not forget to use -o StrictHostKeyChecking no  Otherwise  the connection will hang on the first time you use it  For example  passh -p pa  word ssh -o StrictHostKeyChecking no user host  References   Send command for password doesn  39 t work using Expect script in SSH connection How can I disable strict host key checking in ssh  How to disable SSH host key checking scp without known hosts check pam mount and sshfs with password authentication

User · Answer

A simple Expect script  File Remotelogin exp        usr bin expect     set user  lindex  argv 1      set ip  lindex  argv 0      set password  lindex  argv 2      spawn ssh  user  ip     expect  quot password quot      send  quot  password r quot      interact  Example    Remotelogin exp  lt ip gt   lt user name gt   lt password gt

User · Answer

Another way that I found useful to use a small Expect script from a Bash script is as follows      Bash script start Bash commands     expect -  lt  lt EOF spawn your-command-here expect  quot some-pattern quot  send  quot some-command quot          EOF     More Bash commands      This works because    If the string  quot - quot  is supplied as a filename  standard input is read instead

User · Answer

Mixing Bash and Expect is not a good way to achieve the desired effect  I d try to use only Expect     usr bin expect eval spawn ssh -oStrictHostKeyChecking no -oCheckHostIP no usr  myhost example com    Use the correct prompt set prompt  quot          quot  interact -o -nobuffer -re  prompt return send  quot my password r quot  interact -o -nobuffer -re  prompt return send  quot my command1 r quot  interact -o -nobuffer -re  prompt return send  quot my command2 r quot  interact  Sample solution for bash could be     bin bash  usr bin expect -c  expect  quot  n quot    eval spawn ssh -oStrictHostKeyChecking no -oCheckHostIP no usr  myhost example com  interact     This will wait for Enter and then return to  for a moment  the interactive session

[linux] Use Expect in a Bash script to provide a password to an SSH command

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