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Full Discussion: Difference between using Here document and Expect in scripts
Top Forums UNIX for Dummies Questions & Answers Difference between using Here document and Expect in scripts Post 302523622 by jim mcnamara on Thursday 19th of May 2011 07:52:22 AM
Old 05-19-2011
In order to change a password or run sftp with an 'interactive' password requires that the process breaks off from the parent and becomes a session leader. The session has no attached tty.

This is what a daemon process and expect do.

passwd and sftp and ssh are designed to prevent security breaches. Putting a password in plaintext in a script is a security breach

Go here:
http://www.rite-group.com/rich/ssp/index.html

download the source code, find the pty.c program under the pseudo_term directory -- this is what expcect does so that people can get around the inbuilt security of passwd for example.
Last edited by jim mcnamara; 05-19-2011 at 08:59 AM..
 

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LEARN ABOUT X11R4

sftp-server

sftp-server(1M)                                           System Administration Commands                                           sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0        Successful completion.

       >0       An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
       +-----------------------------+-----------------------------+
       |Availability                 |SUNWsshdu                    |
       +-----------------------------+-----------------------------+
       |Interface Stability          |Evolving                     |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,  and  copyright  for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10                                                          30 Jul 2003                                                    sftp-server(1M)
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