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Full Discussion: script accepting password
Top Forums Shell Programming and Scripting script accepting password Post 302561235 by Corona688 on Monday 3rd of October 2011 03:46:07 PM
Old 10-03-2011
Quote:
Originally Posted by gary_w
Read up on "here documents". Although it is a security risk to have the password in plain text in a file.
That won't work, ever. I wasn't kidding when I said scp, ssh, su, sudo, and most other sane authentication systems are explicitly designed to prevent this -- it's easy for a C program to tell a pipe or file apart from a real terminal, and easier still for a program to just ignore them and talk to the raw terminal itself, /dev/tty, neatly bypassing any redirection. This is because 'interactive password authentication' means 'password typed by a human authentication'.

You'd need to resort to third-party brute-forcing utilities to forcefeed it a plaintext password from file. Fortunately, there's better ways built into ssh as a standard feature: keys.

Last edited by Corona688; 10-03-2011 at 04:51 PM..
 

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SSH-COPY-ID(1)						      General Commands Manual						    SSH-COPY-ID(1)

NAME
ssh-copy-id - install your public key in a remote machine's authorized_keys SYNOPSIS
ssh-copy-id [-i [identity_file]] [user@]machine DESCRIPTION
ssh-copy-id is a script that uses ssh to log into a remote machine (presumably using a login password, so password authentication should be enabled, unless you've done some clever use of multiple identities) It also changes the permissions of the remote user's home, ~/.ssh, and ~/.ssh/authorized_keys to remove group writability (which would oth- erwise prevent you from logging in, if the remote sshd has StrictModes set in its configuration). If the -i option is given then the identity file (defaults to ~/.ssh/id_rsa.pub) is used, regardless of whether there are any keys in your ssh-agent. Otherwise, if this: ssh-add -L provides any output, it uses that in preference to the identity file. If the -i option is used, or the ssh-add produced no output, then it uses the contents of the identity file. Once it has one or more fin- gerprints (by whatever means) it uses ssh to append them to ~/.ssh/authorized_keys on the remote machine (creating the file, and directory, if necessary) SEE ALSO
ssh(1), ssh-agent(1), sshd(8) OpenSSH 14 November 1999 SSH-COPY-ID(1)
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