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#!/usr/bin/env perl
use extreme;
use Getopt::Long;
use Digest::MD5 qw(md5_hex);
use JSON::XS;
use File::Slurp qw(read_file write_file);
my $exitcode = 0;
my $append = ' ';
my ( $opt_u, $opt_d, $opt_md5, $opt_e, $opt_c, $opt_t );
help() if !(@ARGV);
# Set options
GetOptions(
"help|h" => \&help,
"u=s" => \$opt_u,
"d=s" => \$opt_d,
"md5=s" => \$opt_md5,
"e=s" => \$opt_e,
"c=s" => \$opt_c,
"t=s" => \$opt_t,
);
unless ( $opt_u && $opt_md5 && $opt_c ) {
&help;
}
our ( %whitelist, @suid, @world );
push ( @suid,
'/usr/lib64/nagios/plugins/check_ide_smart',
'/usr/lib64/nagios/plugins/check_icmp',
'/usr/lib64/nagios/plugins/check_fping',
'/usr/lib64/nagios/plugins/check_dhcp',
'/usr/bin/quota',
'/usr/bin/gpasswd',
'/usr/bin/su',
'/usr/bin/crontab',
'/usr/bin/passwd',
'/usr/bin/sudo',
'/usr/bin/mount',
'/usr/bin/pkexec',
'/usr/bin/umount',
'/usr/bin/newgrp',
'/usr/bin/chage',
'/usr/lib/polkit-1/polkit-agent-helper-1',
'/usr/sbin/unix_chkpwd',
'/usr/sbin/usernetctl',
'/usr/sbin/pam_timestamp_check',
'/usr/libexec/dbus-1/dbus-daemon-launch-helper',
'/usr/share/python-cllib/userdomains',
'/usr/sbin/userhelper',
'/usr/bin/chsh',
'/usr/bin/chfn',
'/usr/bin/at',
'/usr/bin/staprun',
'/usr/sbin/mount.nfs',
);
if ( $opt_t && $opt_t eq 'shared' ) {
# check if cpanel users in cagefs
my @cagefs = `/sbin/cagefsctl --list-enabled`;
shift @cagefs;
chomp @cagefs;
my @incidents_cagefs;
my @users_shared;
my @exclude = split ( ',', $opt_e ) if $opt_e;
# cpanel
if ( -d '/var/cpanel/users' ) {
for my $user (</var/cpanel/users/*>) {
$user = ( split '/', $user )[-1];
next if -f '/var/cpanel/suspended/' . $user;
push @users_shared, $user;
}
}
# ispmanager
if ( -f '/usr/local/mgr5/sbin/mgrctl' ) {
my $users_info_raw = `/usr/local/mgr5/sbin/mgrctl -o json -m ispmgr user`;
my $users_info = decode_json($users_info_raw)->{doc}{elem};
my @active = grep { $_->{active}{'$'} eq 'on' } @{$users_info};
push @users_shared, $_->{name}{'$'} for (@active);
}
# directadmin
if ( -d '/usr/local/directadmin' ) {
my $prefix = '/usr/local/directadmin/data/users';
for my $user (<$prefix/*>) {
$user = ( split '/', $user )[-1];
next if !-f "$prefix/$user/user.conf";
my $suspended = map /^suspended=yes/,
read_file("$prefix/$user/user.conf");
next if $suspended;
push @users_shared, $user;
}
}
for (@users_shared) {
push @incidents_cagefs, $_ unless ( ( $_ ~~ @cagefs || $_ ~~ @exclude ) );
}
if (@incidents_cagefs) {
$exitcode = 2;
print_match( 'Found users with disabled CageFS:', @incidents_cagefs );
}
push ( @world,
'/etc/cxs/cxscgi.queue',
'/var/lib/net-snmp/mib_indexes/0',
'/var/lib/patchman/tmp'
);
push ( @suid,
'/usr/sbin/exim',
'/usr/sbin/suexec',
'/usr/bin/cagefs_enter.proxied',
'/usr/lib64/mysql/plugin/auth_pam_tool_dir/auth_pam_tool'
);
}
if ( $opt_t && $opt_t eq 'tools' ) {
push ( @suid,
'/usr/bin/fusermount',
'/usr/sbin/grub2-set-bootflag',
'/usr/libexec/qemu-bridge-helper',
'/usr/libexec/sssd/ldap_child',
'/usr/libexec/sssd/proxy_child',
'/usr/libexec/sssd/selinux_child',
'/usr/libexec/sssd/krb5_child'
);
push ( @world,
'/var/cache/coolkey',
'/var/.vz_swap'
);
}
$whitelist{'world'} = \@world;
$whitelist{'suid'} = \@suid;
my @users = split ( ',', $opt_u );
# populate find cmd and execute it
my @dirs = split ( ',', $opt_d ) if $opt_d;
for my $dir (@dirs) {
chomp $dir;
next if $dir !~ qr{^(/[a-zA-Z0-9*_-]+)+$}x;
$append .= '! \( -path "' . $dir . '*" -prune \) ';
}
my $cmd = 'find / \( -type f -o -type d \) ' . $append;
my $world_cmd = $cmd . '-perm /o+w 2>/dev/null';
my @world_files = execute_find( $world_cmd, 'world' );
if (@world_files) {
print_match( 'World readable/writable files found:', @world_files);
$exitcode = 1;
}
my $suid_cmd = $cmd . '-perm /4000 2>/dev/null';
my @suid_files = execute_find( $suid_cmd, 'suid' );
if (@suid_files) {
print_match( 'Files with SUID bit found:', @suid_files);
$exitcode = '1';
}
# check for ssh keys amount and hashsum
my $ssh_file = '/root/.ssh/authorized_keys';
open ( my $FILE, '<', $ssh_file );
my @content = sort <$FILE>;
chomp @content;
1 while <$FILE>;
my $count = $.;
close $FILE;
my $md5_hash = md5_hex(@content);
if ( $count > $opt_c ) {
$exitcode = 2;
say '*******';
say 'The amount of keys in ' . $ssh_file . ' does not match the amount of users passed!';
say 'Check the file for possible unwanted or malicious keys.';
}
if ( $md5_hash ne $opt_md5 ) {
$exitcode = 2;
say '*******';
say 'URGENT: The md5 hash for ssh keys file does not match!';
}
# check wheel group
my ( $gname, $gpasswd, $gid, $gmembers, %garray, @wheel_users );
while ( ( $gname, $gpasswd, $gid, $gmembers ) = getgrent ) {
next if ( $gname ne 'wheel' );
@wheel_users = split( /\s+/, $gmembers );
}
my @incidents_wheel;
for my $wheel_user (@wheel_users) {
push @incidents_wheel, $wheel_user unless $wheel_user ~~ @users;
}
if (@incidents_wheel) {
$exitcode = 2;
print_match( 'Found extra users in wheel group:', @incidents_wheel );
}
exit $exitcode;
# subs
sub help {
print "Usage : $0 -u user1,user2,user3 -d dir1,dir2,dir3\n";
print "Options :\n";
print " -u: List of usernames to search in wheel group\n";
print " -d: List of directories to exclude from find string\n";
print " -md5: md5sum for ssh key file, here is an example how to calculate it:\n";
print ' perl -e \'use Digest::MD5 qw(md5_hex); print md5_hex(sort map { chomp; $_ } <>)\' /root/.ssh/authorized_keys' . "\n";
print " -e: List of usernames to exclude from CageFS checks\n";
print " -c: Amount of keys that are expected to reside in authorized_keys file\n";
print " -t: server type to generate additional whitelist exceptions. Current available values: shared, tools.";
print "\nExample of usage : $0 -u admin,dev -d /proc,/usr/lib64 -md5 2a53da1a6fbfc0bafdd96b0a2ea29515 -e username1,username2\n";
exit 3;
}
sub print_match {
my ( $message, @info ) = @_;
say '*******';
say $message;
say join( "\n", @info );
}
sub execute_find {
my ( $cmd, $type ) = @_;
my @list = `$cmd`;
chomp @list;
return if !@list;
my $wlfile = '/etc/icinga2/plinc/security_' . $type . '_wl';
write_file( $wlfile, join ( "\n", @{$whitelist{$type}} ) ) if !-f $wlfile;
my @whitelist = read_file($wlfile);
chomp @whitelist;
if ( @whitelist ) {
for my $line (@whitelist) {
@list = grep {!/^$line$/} @list;
}
}
return @list;
};