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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platform::shell

platform::shell(n)					       Tcl Bundled Packages						platform::shell(n)

__________________________________________________________________________________________________________________________________________________

NAME

       platform::shell - System identification support code and utilities

SYNOPSIS

       package require platform::shell ?1.1.4?

       platform::shell::generic shell
       platform::shell::identify shell
       platform::shell::platform shell
_________________________________________________________________

DESCRIPTION

       The platform::shell package provides several utility commands useful for the identification of the architecture of a specific Tcl shell.

       This  package  allows the identification of the architecture of a specific Tcl shell different from the shell running the package. The only
       requirement is that the other shell (identified by its path), is actually executable on the current machine.

       While for most platform this means that the architecture of the interrogated shell is identical to the architecture of  the  running  shell
       this  is  not generally true. A counter example are all platforms which have 32 and 64 bit variants and where a 64bit system is able to run
       32bit code. For these running and interrogated shell may have different 32/64 bit settings and thus different identifiers.

       For applications like a code repository it is important to identify the architecture of the shell which will  actually  run  the  installed
       packages, versus the architecture of the shell running the repository software.

COMMANDS

       platform::shell::identify shell
	      This command does the same identification as platform::identify, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::generic shell
	      This command does the same identification as platform::generic, for the specified Tcl shell, in contrast to the running shell.

       platform::shell::platform shell
	      This command returns the contents of tcl_platform(platform) for the specified Tcl shell.

KEYWORDS

       operating system, cpu architecture, platform, architecture

platform::shell 						       1.1.4							platform::shell(n)