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# **** 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) 2007 Vyatta, Inc.
# All Rights Reserved.
#
# **** End License ****
package Vyatta::Login::User;
use strict;
use warnings;
use lib "/opt/vyatta/share/perl5";
use Vyatta::Config;
use Vyatta::Misc;
# Exit codes form useradd.8 man page
my %reasons = (
0 => 'success',
1 => 'can´t update password file',
2 => 'invalid command syntax',
3 => 'invalid argument to option',
4 => 'UID already in use (and no -o)',
6 => 'specified group doesn´t exist',
9 => 'username already in use',
10 => 'can´t update group file',
12 => 'can´t create home directory',
13 => 'can´t create mail spool',
);
# Construct a map from existing users to group membership
sub get_groups {
my %group_map;
setgrent();
while ( my ( $name, undef, undef, $members ) = getgrent() ) {
foreach my $user ( split / /, $members ) {
$group_map{$user} = [] unless ( $group_map{$user} );
my $g = $group_map{$user};
push @$g, $name;
}
}
endgrent();
return \%group_map;
}
my $levelFile = "/opt/vyatta/etc/level";
# Convert level to additional groups
sub _level2groups {
my $level = shift;
my @groups;
open (my $f, '<', $levelFile)
or return;
while (<$f>) {
chomp;
next unless $_;
my ($l, $g) = split /:/;
if ($l eq $level) {
@groups = split(/,/, $g);
last;
}
}
close $f;
return @groups;
}
# protected users override file
my $protected_users = '/opt/vyatta/etc/protected-user';
# Users who MUST not use vbash
sub _protected_users {
my @protected;
open my $pfd, '<', $protected_users
or return;
while (<$pfd>) {
chomp;
next unless $_;
push @protected, $_;
}
close($pfd);
return @protected;
}
# make list of vyatta users (ie. users of vbash)
sub _vyatta_users {
my @vusers;
setpwent();
# ($name,$passwd,$uid,$gid,$quota,$comment,$gcos,$dir,$shell,$expire)
# = getpw*
while ( my ($name, undef, undef, undef, undef, undef,
undef, undef, $shell) = getpwent() ) {
push @vusers, $name if ($shell eq '/bin/vbash');
}
endpwent();
return @vusers;
}
sub update {
my $membership = get_groups();
my $uconfig = new Vyatta::Config;
$uconfig->setLevel("system login user");
my %users = $uconfig->listNodeStatus();
die "All users deleted!\n" unless %users;
die "User root cannot be deleted\n"
if (! defined $users{'root'} || $users{'root'} eq 'deleted');
foreach my $user ( keys %users ) {
if ( $users{$user} eq 'deleted' ) {
system("sudo userdel -r '$user'") == 0
or die "userdel failed: $?\n";
}
elsif ( $users{$user} eq 'added' || $users{$user} eq 'changed' ) {
$uconfig->setLevel("system login user $user");
my $pwd = $uconfig->returnValue('authentication encrypted-password');
unless ($pwd) {
warn "Encrypted password not in configuration for $user";
next;
}
my $level = $uconfig->returnValue('level');
unless ($level) {
warn "Level not defined for $user";
next;
}
# map level to group membership
my @new_groups = _level2groups($level);
# add any additional groups from configuration
push( @new_groups, $uconfig->returnValues('group') );
my $fname = $uconfig->returnValue('full-name');
my $home = $uconfig->returnValue('home-directory');
# Read existing settings
my (undef, $opwd, $uid, $gid, undef, $comment,
undef, $dir, $shell, undef) = getpwnam($user);
my $old_groups = $membership->{$user};
my $cmd;
my $og_str = (defined($old_groups))
? (join(' ', sort @$old_groups)) : '';
my $ng_str = join(' ', sort @new_groups);
# not found in existing passwd, must be new
if ( !defined $uid ) {
# make new user using vyatta shell
# and make home directory (-m)
# and with default group of 100 (users)
$cmd = 'useradd -s /bin/vbash -m -N';
} elsif ($opwd eq $pwd
&& ( !$fname || $fname eq $comment )
&& ( !$home || $home eq $dir )
&& $og_str eq $ng_str) {
# If no part of password or group file changed
# then there is nothing to do here.
next;
} else {
$cmd = "usermod";
}
$cmd .= " -p '$pwd'";
$cmd .= " -c \"$fname\"" if ( defined $fname );
$cmd .= " -d \"$home\"" if ( defined $home );
$cmd .= ' -G ' . join( ',', @new_groups );
system("sudo $cmd $user");
next if ( $? == 0 );
my $reason = $reasons{ ( $? >> 8 ) };
die "Attempt to change user $user failed: $reason\n";
}
}
# Remove any vyatta users that do not exist in current configuration
# This can happen if user added but configuration not saved
my %protected = map { $_ => 1 } _protected_users();
foreach my $user (_vyatta_users()) {
if ($protected{$user}) {
warn "User $user should not being using vbash - fixed\n";
system ("usermod -s /bin/bash $user") == 0
or die "Attempt to modify user $user shell failed: $!";
} elsif (! defined $users{$user}) {
warn "User $user not listed in current configuration\n";
system ("userdel --remove $user") == 0
or die "Attempt to delete user $user failed: $!";
}
}
}
1;
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