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#!/usr/bin/perl -w
# checkpasswd-service
# part of userv-utils
# protocols:
#
# userv root checkpasswd-self <<'END'
# < PASSWORD
# < ^D
# > STATUS MESSAGE...
#
# userv root checkpasswd-other USERNAME <<'END'
# < PASSWORD
# < ^D
# > STATUS MESSAGE...
#
# STATUS MESSAGE may be
# 0 ok
# 2 incorrect password
# 4 no such user
# 5 password disabled
# Copyright 1996-2013 Ian Jackson <ijackson@chiark.greenend.org.uk>
# Copyright 1998 David Damerell <damerell@chiark.greenend.org.uk>
# Copyright 1999,2003
# Chancellor Masters and Scholars of the University of Cambridge
# Copyright 2010 Tony Finch <fanf@dotat.at>
#
# This is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with userv-utils; if not, see http://www.gnu.org/licenses/.
use strict;
use IO::File;
use Fcntl qw(:flock);
my ($lockpath, $delay, $separator, $username) = @ARGV;
die "$0: bad usage\n" unless
@ARGV == 4 ||
$lockpath =~ m#^/# ||
$delay =~ m/^[0-9.]+$/ ||
$separator eq '--' ||
$username =~ m/^\w/;
$username = $ENV{'USERV_USER'} if $username eq 'SELF';
sub result {
print "@_\n" or die $!;
exit 0;
}
my @pwent = getpwnam($username);
result 4, "no such user" unless @pwent;
my $encrpw= $pwent[1];
result 5, "password disabled" unless length $encrpw >= 13;
$!=0; my $pw = <STDIN>;
chomp $pw or die "reading password: $!\n";
my $lockf = new IO::File $lockpath, "w+" or die "open $lockpath: $!\n";
flock($lockf, LOCK_EX) or die "lock $lockpath: $!\n";
select(undef,undef,undef,0.5);
close $lockf;
my $crval = crypt($pw,$encrpw);
result 2, "incorrect password" unless $crval eq $encrpw;
result 0, "ok";
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