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#!/usr/bin/perl
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# 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.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2010 Vyatta, Inc.
# All Rights Reserved.
#
# **** End License ****
use strict;
use warnings;
my $passwdFile = '/etc/passwd';
# Lookup user in password file which may not give same
# result as getpw* which uses NSS
sub finduser {
my $user = shift;
my $uid;
open( my $f, '<', $passwdFile )
or die "Can't open $passwdFile: $!";
while (<$f>) {
chomp;
my ( $name, undef, $id ) = split /:/;
next unless ( $name eq $user );
$uid = $id;
last;
}
close $f;
return $uid;
}
foreach my $user (@ARGV) {
# enforce recommendations from useradd man page
# Debian, the only constraints are that usernames must neither start
# with a dash (-) nor contain a colon (:) or a whitespace (space: , end
# of line: \n, tabulation: \t, etc.). Note that using a slash (/) may
# break the default algorithm for the definition of the users home
# directory.
die "$user : illegal characters in username\n"
unless ($user =~ /^\w[^ \t\n\r\v\f:\/]*$/);
# Usernames may only be up to 32 characters long.
die "$user: username may only be up to 32 characters long\n"
if (length($user) > 32);
# It is usually recommended to only use usernames that begin with a
# lower case letter or an underscore followed by lower case letters,
# digits, underscores, or dashes. They can end with a dollar sign.
# In regular expression terms: [a-z_][a-z0-9_-]*[$]?
warn "$user: username contains unusual characters\n"
. " should only contain lower case letters, digits, underscores or dashes\n"
unless ($user =~ /^[a-z_][a-z0-9_-]*\$?$/);
# User does not exist in system, its okay
my $uid = getpwnam($user);
next unless defined($uid);
# System accounts should not be listed in vyatta configuration
# 1000 is SYS_UID_MIN
die "$user : account is already reserved for system use\n"
if ($uid > 0 && $uid < 1000);
my $pwuid = finduser($user);
die "$user : account exists but is not local (change on server)\n"
unless defined ($pwuid);
die "$user : exists but has different uid on local versus remote\n"
unless ($pwuid eq $uid);
}
exit 0;
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