File:  [LON-CAPA] / loncom / pwchange
Revision 1.9: download - view: text, annotated - select for diffs
Mon Feb 3 18:03:52 2003 UTC (19 years, 8 months ago) by harris41
Branches: MAIN
CVS tags: version_2_8_X, version_2_8_2, version_2_8_1, version_2_8_0, version_2_7_X, version_2_7_99_1, version_2_7_99_0, version_2_7_1, version_2_7_0, version_2_6_X, version_2_6_99_1, version_2_6_99_0, version_2_6_3, version_2_6_2, version_2_6_1, version_2_6_0, version_2_5_X, version_2_5_99_1, version_2_5_99_0, version_2_5_2, version_2_5_1, version_2_5_0, version_2_4_X, version_2_4_99_0, version_2_4_2, version_2_4_1, version_2_4_0, version_2_3_X, version_2_3_99_0, version_2_3_2, version_2_3_1, version_2_3_0, version_2_2_X, version_2_2_99_1, version_2_2_99_0, version_2_2_2, version_2_2_1, version_2_2_0, version_2_1_X, version_2_1_99_3, version_2_1_99_2, version_2_1_99_1, version_2_1_99_0, version_2_1_3, version_2_1_2, version_2_1_1, version_2_1_0, version_2_0_X, version_2_0_99_1, version_2_0_2, version_2_0_1, version_2_0_0, version_1_99_3, version_1_99_2, version_1_99_1_tmcc, version_1_99_1, version_1_99_0_tmcc, version_1_99_0, version_1_3_X, version_1_3_3, version_1_3_2, version_1_3_1, version_1_3_0, version_1_2_X, version_1_2_99_1, version_1_2_99_0, version_1_2_1, version_1_2_0, version_1_1_X, version_1_1_99_5, version_1_1_99_4, version_1_1_99_3, version_1_1_99_2, version_1_1_99_1, version_1_1_99_0, version_1_1_3, version_1_1_2, version_1_1_1, version_1_1_0, version_1_0_99_3, version_1_0_99_2, version_1_0_99_1, version_1_0_99, version_1_0_3, version_1_0_2, version_1_0_1, version_1_0_0, version_0_99_5, version_0_99_4, version_0_99_3, version_0_99_2, version_0_99_1, version_0_99_0, conference_2003, bz5969, HEAD, GCI_1, BZ5971-printing-apage, BZ5434-fox
best wishes to all.

#!/usr/bin/perl

# The Learning Online Network with CAPA
#
# pwchange - setuid script to change unix passwords
#
# YEAR=2001
#
# YEAR=2002
# 02/19 Matthew Hall
#
# $Id: pwchange,v 1.9 2003/02/03 18:03:52 harris41 Exp $
###

use strict;
my $noprint = 1;



print "In pwchange\n" unless $noprint;
print "Real uid = $< effective uid = $> \n" unless $noprint;
# ------------------------------------------------------------------ Untainting
$ENV{'PATH'}='/bin:/usr/bin'; # Nullify path information.
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)}; # nullify potential taints

# ---------------------------- Make sure this process is running from user=root

if (0 != $<) {
    print "Username not root" unless $noprint;
   exit 1;
}
# ----------------------------------------------- If not running setuid as root
if ($>!=0) {
    print "Not setuid to root" unless $noprint;
    exit 1;
}

# ----------------------------------------------- Make sure arguments are valid
my $user=shift @ARGV;
$user=~/^(\w+)$/;
my $safe=$1;
print "Save user = $safe" unless $noprint;

my $pword=<>;
chomp $pword;
unless (length($safe) and ($user eq $safe) and ($safe=~/^[A-Za-z]/)) {
    exit 2;
}
print "Password = $pword" unless $noprint;
my $pbad=0;
foreach (split(//,$pword)) {if ((ord($_)<32)||(ord($_)>126)){$pbad=1;}} 
exit 3 if $pbad;

# --------------------------------------------------------- Call system command
open OUT,"|passwd --stdin $safe >/dev/null";
print OUT $pword;
print OUT "\n";
close OUT;

# --------------------------------------- exit with status of command execution
exit $?/256;

=head1 NAME

pwchange - setuid script to change unix passwords

=head1 DESCRIPTION

Setuid script to change unix passwords.

=head1 README

Setuid script to change unix passwords.

=head1 PREREQUISITES

=head1 COREQUISITES

=pod OSNAMES

linux

=pod SCRIPT CATEGORIES

LONCAPA/Administrative

=cut

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