encryption is possible?? Post: 24328

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Top Forums Shell Programming and Scripting encryption is possible?? Post 24328 by RTM on Wednesday 10th of July 2002 09:43:12 AM

07-10-2002

Registered User

You can use encryption in a script but what are you using to write this in? If you are looking to do something with the password and/or shadow file, using Perl may be the way to go (at least for the call to the password/shadow file).

Unsure what you mean by "shadow the scripting file".

Question 2: What are you using - is this a web interface? Or just a script that normal users can run to change something (what?).

To prevent password from being seen:
from a web page: set input type to password
<input type="password" name="newpass" size=15>
For a terminal: stty -echo turns off echo, stty echo turns it back on. Check the man page for stty.

Q3: Yes, if you encrypt a file you can still retrieve data but you have to unencrypt it in the case of pgp. If you are talking about retrieve what a password is - not exactly. You can find out if a unencrypted password matches with the following - but you don't really unencrypt the password - you compare by encrypting.

Perl script to check a password - supply userid and password

#!/u/bin/perl
#
# Grab the user's old password from /etc/shadow and compare to sent
# old password from web page - send back error if not the same
#
=======================================
$user = "$ARGV[0]";
$oldpass = "$ARGV[1]";
$datenow = "`date '+%h %d %T'`";
#
$userinfo = `/usr/bin/grep $user /etc/shadow`;
($user1, $passwd1, $passextra) = split(/:/, $userinfo, 3);
$salt = substr($passwd1,0,2);
#
if (crypt($oldpass, $salt) ne $passwd1) {
die "Not correct password";
}

RTM

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atf-sh

ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME

     atf-sh [-s shell] -- interpreter for shell-based test programs

SYNOPSIS

     atf-sh script

DESCRIPTION

     atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library.

     atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL.  atf-sh executes the inter-
     preter, loads the atf-sh(3) library and then runs the script.  You must consider atf-sh to be a POSIX shell by default and thus should not
     use any non-standard extensions.

     The following options are available:

     -s shell	  Specifies the shell to use instead of the value provided by ATF_SHELL.

ENVIRONMENT

     ATF_LIBEXECDIR    Overrides the builtin directory where atf-sh is located.  Should not be overridden other than for testing purposes.
     ATF_PKGDATADIR    Overrides the builtin directory where libatf-sh.subr is located.  Should not be overridden other than for testing purposes.
     ATF_SHELL	       Path to the system shell to be used in the generated scripts.  Scripts must not rely on this variable being set to select a
		       specific interpreter.

EXAMPLES

     Scripts using atf-sh(3) should start with:

	   #! /usr/bin/env atf-sh

     Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh.  Instead, you have to hardcode
     the path to atf-sh in the script and then use the -s option afterwards as a single parameter:

	   #! /path/to/bin/atf-sh -s/bin/bash

ENVIRONMENT

     ATF_SHELL	  Path to the system shell to be used in the generated scripts.

SEE ALSO

     atf-sh(3)

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