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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',
);
my $levelFile = "/opt/vyatta/etc/level";
# Convert level to additional groups
sub _level_groups {
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;
}
sub _authorized_keys {
my $user = shift;
my $config = new Vyatta::Config;
$config->setLevel("system login user $user authentication public-keys");
my @keys = $config->listNodes();
return unless @keys;
# ($name,$passwd,$uid,$gid,$quota,$comment,$gcos,$dir,$shell,$expire)
# = getpw*
my ( undef, undef, $uid, $gid, undef, undef, undef, $home ) =
getpwnam($user);
return unless $home;
return unless -d $home;
my $sshdir = "$home/.ssh";
unless ( -d $sshdir ) {
mkdir $sshdir;
chown( $uid, $gid, $sshdir );
chmod( 0750, $sshdir );
}
my $keyfile = "$sshdir/authorized_keys";
open( my $auth, '>', $keyfile)
or die "open $keyfile failed: $!";
print {$auth} "# Automatically generated by Vyatta configuration\n";
print {$auth} "# Do not edit, all changes will be lost\n";
foreach my $name (@keys) {
my $type = $config->returnValue("$name type");
my $key = $config->returnValue("$name key");
print {$auth} "$type $key $name\n";
}
close $auth;
chmod( 0640, $keyfile );
chown( $uid, $gid, $keyfile)
}
sub _delete_user {
my $user = shift;
if ( $user eq 'root' ) {
warn "Disabling root account, instead of deleting\n";
system('usermod -p ! root') == 0
or die "usermod of root failed: $?\n";
} elsif ( getlogin() eq $user ) {
die "Attempting to delete current user: $user\n";
} else {
# This logs out user (so we can delete it)
system("pkill -u $user");
system("userdel $user") == 0
or die "userdel of $user failed: $?\n";
}
}
sub _update_user {
my $user = shift;
my $cfg = new Vyatta::Config;
$cfg->setLevel("system login user $user");
my $pwd = $cfg->returnValue('authentication encrypted-password');
my $level = $cfg->returnValue('level');
my $fname = $cfg->returnValue('full-name');
my $home = $cfg->returnValue('home-directory');
unless ($pwd) {
warn "Encrypted password not in configuration for $user";
return;
}
unless ($level) {
warn "Level not defined for $user";
return;
}
# map level to group membership
my @groups = _level_groups($level);
# add any additional groups from configuration
push( @groups, $cfg->returnValues('group') );
# Read existing settings
my $uid = getpwnam($user);
# not found in existing passwd, must be new
my $cmd;
unless ( defined($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';
} else {
# update existing account
$cmd = "usermod";
}
$cmd .= " -p '$pwd'";
$cmd .= " -c \"$fname\"" if ( defined $fname );
$cmd .= " -d \"$home\"" if ( defined $home );
$cmd .= ' -G ' . join( ',', @groups );
system("$cmd $user");
unless ( $? == 0 ) {
my $reason = $reasons{ ( $? >> 8 ) };
die "Attempt to change user $user failed: $reason\n";
}
}
# returns list of dynamically allocated users (see Debian Policy Manual)
sub _local_users {
my @users;
setpwent();
while ( my ($name, undef, $uid, undef, undef, undef,
undef, undef, $shell) = getpwent() ) {
next unless ($uid >= 1000 && $uid <= 29999);
next unless $shell eq '/bin/vbash';
push @users, $name;
}
endpwent();
return @users;
}
sub update {
my $uconfig = new Vyatta::Config;
$uconfig->setLevel("system login user");
my %users = $uconfig->listNodeStatus();
die "All users deleted!\n" unless %users;
foreach my $user ( keys %users ) {
my $state = $users{$user};
if ( $state eq 'deleted' ) {
_delete_user($user);
next;
}
next unless ( $state eq 'added' || $state eq 'changed' );
_update_user($user);
_authorized_keys($user);
}
# Remove any normal users that do not exist in current configuration
# This can happen if user added but configuration not saved
# and system is rebooted
foreach my $user ( _local_users() ) {
# did we see this user in configuration?
next if defined $users{$user};
warn "removing $user not listed in current configuration\n";
# Remove user account but leave home directory to be safe
system("userdel $user") == 0
or die "Attempt to delete user $user failed: $!";
}
}
1;
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