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#!/usr/local/cpanel/3rdparty/bin/perl # cpanel - scripts/securetmp Copyright 2022 cPanel, L.L.C. # All rights reserved. # copyright@cpanel.net http://cpanel.net # This code is subject to the cPanel license. Unauthorized copying is prohibited use strict; use warnings; use Cpanel::TempFile (); use Cpanel::SafeFile (); use Cpanel::Filesys::FindParse (); use Cpanel::DiskLib (); use Getopt::Long; use Cpanel::Logger (); use Cpanel::SafeRun::Errors (); use Cpanel::SafeRun::Simple (); use Cpanel::Filesys::Mounts (); my $logger = Cpanel::Logger->new(); $\| = 1; ## no critic qw(RequireLocalizedPunctuationVars) my $has_loop_device = 0; my $install = 0; # Add securetmp to system startup my $uninstall = 0; # Remove from system startup my $auto = 0; # Secure /tmp and /var/tmp my $daemonize = 1; my $help = 0; # Get command line options GetOptions( 'auto' => \$auto, 'install' => \$install, 'uninstall' => \$uninstall, 'daemonize!' => \$daemonize, 'help' => \$help ); if ($help) { print <<"MANUAL"; $0 - secure /tmp and /var/tmp Options: - auto: skip interactive customization questions - install: install & enable securetmp service - uninstall: disable & uninstal securetmp service - daemonize: run securetmp in background ( default true ) Sample usages: # run in interactive mode > $0 # disable interactive mode, run in background > $0 --auto # disable interactive mode, do not run in background > $0 --auto --nodaemonize MANUAL exit; } if ( -e '/var/cpanel/version/securetmp_disabled' ) { print "[securetmp] Disabled per /var/cpanel/version/securetmp_disabled\n"; exit; } elsif ( -e '/var/cpanel/disabled/securetmp' ) { print "[securetmp] Disabled per /var/cpanel/disabled/securetmp\n"; exit; } elsif ( -e '/var/cpanel/dev_sandbox' ) { print "[securetmp] Disabled on development sandboxes\n"; exit; } # do check for loopback module for Linux based VPS my @modules = Cpanel::SafeRun::Errors::saferunallerrors('lsmod'); $has_loop_device = check_loop_device(); if ( !grep /loop/, @modules ) { print "* Notice * No loop module detected\n"; # could be built into kernel, so don't bail out yet print "If the loopback block device is built as a module, try running `modprobe loop` as root via ssh and running this script again.\n"; print "If the loopback block device is built into the kernel itself, you can ignore this message.\n"; } if ( !$has_loop_device ) { print "* Notice * No working loopback device files found. Try running `modprobe loop` as root via ssh and running this script again.\n"; exit(0); } # Start interactive setup if ( !$auto && !$install && !$uninstall && -t STDIN ) { print 'Would you like to secure /tmp & /var/tmp at boot time? (y/n) '; my $answer; chomp( $answer = <STDIN> ); if ( $answer =~ m/^y/i ) { $install = 1; } else { print "securetmp will not be added to system startup at this time.\n"; } undef $answer; if ( !$install ) { print 'Would you like to disable securetmp from the system startup? (y/n) '; chomp( $answer = <STDIN> ); if ( $answer =~ m/^y/i ) { $uninstall = 1; } else { print "securetmp will not be removed from system startup.\n"; } undef $answer; } print 'Would you like to secure /tmp & /var/tmp now? (y/n) '; chomp( $answer = <STDIN> ); if ( $answer =~ m/^y/i ) { $auto = 1; } else { print "/tmp & /var/tmp will not be secured at this time.\n"; } exit if ( !$install && !$auto && !$uninstall ); } elsif ( !$auto && !$install && !$uninstall ) { exit 1; } ## ADD/REMOVE from startup #----------------------------------------------------------------- if ( !-x '/usr/local/cpanel/scripts/cpservice' ) { $logger->warn("cpservice is not available. Please check its status."); } else { # Remove securetmp from system startup if ($uninstall) { Cpanel::SafeRun::Simple::saferun( '/usr/local/cpanel/scripts/cpservice', 'securetmp', 'stop' ); Cpanel::SafeRun::Simple::saferun( '/usr/local/cpanel/scripts/cpservice', 'securetmp', 'disable', '2345' ); Cpanel::SafeRun::Simple::saferun( '/usr/local/cpanel/scripts/cpservice', 'securetmp', 'uninstall' ); } # Add securetmp to system startup if ($install) { Cpanel::SafeRun::Simple::saferun( '/usr/local/cpanel/scripts/cpservice', 'securetmp', 'install' ); Cpanel::SafeRun::Simple::saferun( '/usr/local/cpanel/scripts/cpservice', 'securetmp', 'enable', '35' ); # Do not start securetmp here or it will be run again } } #----------------------------------------------------------------- # Fork and secure if not called from console if ( $auto && !-t STDIN && $daemonize ) { $SIG{'CHLD'} = \&reaper; print "Setting up /tmp & /var/tmp in the background\n"; exit if fork; } elsif ( !$auto ) { exit; } print "Securing /tmp & /var/tmp\n"; # Secure PATH $ENV{'PATH'} .= ":/sbin:/usr/sbin"; # Global Variables my $brokenvartmp = 0; my @vnodes = (); my $vnodeconfig = ''; my $vnodesrch = ''; my $vnodenumber = 0; my $tmpmnt = ''; my $vartmpmnt = ''; my $tmpopts = ''; my $vartmpopts = ''; my $mountkeyword = ''; my $cpflags = ''; my $tmpdsksize = 512000; # Must be larger than 250000 $mountkeyword = 'remount'; $cpflags = '-af'; if ( open my $mounts_fh, '<', '/proc/mounts' ) { while ( my $line = readline $mounts_fh ) { # must detect: /dev/sda1 /var/tmp\040(deleted) ext2 rw,nosuid,noexec,usrquota 0 0 if ( $line =~ m/^(\S+)\s+([^\s\\$]+)\S\s+\S+\s+(\S+)/ ) { if ( $2 eq '/tmp' ) { $tmpmnt = $1; $tmpopts = $3; } elsif ( $2 eq '/var/tmp' ) { $vartmpmnt = $1; $vartmpopts = $3; } if ( $1 =~ /^\/dev\/vn./ ) { push @vnodes, $1; } } if ( $line =~ m/\S+\s+\(deleted$[^\/]\/var\/tmp\s+/ ) { $brokenvartmp = 1; $vartmpmnt = ''; $vartmpopts = ''; } } close $mounts_fh; } else { die "Unable to read /proc/mounts: $!"; } # Begin securetmp actions if ( !$tmpmnt ) { print "Calculating size on /tmp\n"; my $partition_map = {}; my $filesys = Cpanel::DiskLib::get_disk_used_percentage_with_dupedevs(); foreach my $disk ( @{$filesys} ) { $partition_map->{ $disk->{'mount'} } = $disk->{'available'}; } my $mount_point = Cpanel::Filesys::FindParse::find_mount( $filesys, '/usr/tmpDSK' ); my $available = $partition_map->{$mount_point}; my $five_percent_of_available = ( $available 0.05 ); if ( $five_percent_of_available > $tmpdsksize ) { $tmpdsksize = $five_percent_of_available; } my $FOUR_GIG_k = ( 1024 * 1024 * 4 ); if ( $tmpdsksize > $FOUR_GIG_k ) { $tmpdsksize = $FOUR_GIG_k; } $tmpdsksize = int($tmpdsksize); $tmpdsksize = $tmpdsksize - ( $tmpdsksize % 1024 ); my $tmpdsksize_megs = ( $tmpdsksize / 1024 ); print "/tmp calculated to be $tmpdsksize_megs M based on available disk space in /usr\n"; # Check loop dev on Linux if ( !$has_loop_device ) { print "The system does not support loop devices.\n"; if ($brokenvartmp) { print 'Unmounting orphaned /var/tmp ...'; system 'umount', '/var/tmp'; print "Done\n"; } exit; } if ( -d '/usr/tmpDSK' ) { rename( '/usr/tmpDSK', '/usr/tmpDSK.move_away.' . $$ . '.' . time() ); } if ( !-e '/usr/tmpDSK' ) { print "No separate partition for tmp!\n"; createtmpdisk('/usr/tmpDSK'); } elsif ( -d '/usr/tmpDSK' ) { die "/usr/tmpDSK exists as a directory. Please remove and rerun /usr/local/cpanel/scripts/securetmp.\n"; } # ensure that /usr/tmpDSK is large enough elsif ( ( -s '/usr/tmpDSK' ) < ( $tmpdsksize * 1024 ) ) { print "Your /tmp is too small. Rebuilding it now.\n"; system 'rm', '-f', '/usr/tmpDSK'; createtmpdisk('/usr/tmpDSK'); } else { print "Everything looks good with your /tmp. Its the right size and ready to go.\n"; } print 'Setting up /tmp... '; if ( -e '/usr/tmp.secure' ) { system 'mv', '-f', '/usr/tmp.secure', '/usr/tmp.secure.cpback'; } mkdir '/usr/tmp.secure'; archivecopy( '/tmp', '/usr/tmp.secure' ); system 'rm', '-rf', '/tmp'; mkdir '/tmp'; chmod( oct(1777), '/tmp' ); my $mountresult = mounttmpdsk( '/usr/tmpDSK', '/tmp', $tmpopts ); archivecopy( '/usr/tmp.secure/tmp/.', '/tmp' ); chmod( oct(1777), '/tmp' ); system 'rm', '-rf', '/usr/tmp.secure'; if ($mountresult) { die "There was a problem mounting /tmp: $mountresult"; } print "Done\n"; } elsif ( $tmpmnt && $tmpopts !~ m/noexec/ ) { print 'Securing /tmp... '; system 'mount', '-o', $mountkeyword . ',noexec,nosuid', $tmpmnt, '/tmp'; print "Done\n"; } else { print "/tmp is already secure\n"; } if ( $brokenvartmp \|\| ( $vartmpmnt && $vartmpopts !~ m/noexec/ ) ) { print 'Unmounting insecure /var/tmp... '; system 'umount', '/var/tmp'; $vartmpmnt = ''; $vartmpopts = ''; print "Done\n"; } if ( !$vartmpmnt ) { print 'Setting up /var/tmp... '; if ( !-e '/var/tmp' ) { mkdir '/var/tmp'; } elsif ( !-d '/var/tmp' ) { system 'mv', '/var/tmp', '/var/tmp.cpback'; mkdir '/var/tmp'; } system 'mount', '-o', 'bind,noexec,nosuid', '/tmp', '/var/tmp'; print "Done\n"; } else { print "/var/tmp is already secure\n"; } my $usingTMPDSK = 0; if ( -e '/usr/tmpDSK' ) { my $mount = `mount`; if ( $mount =~ m/tmpDSK/ ) { $usingTMPDSK = 1; } } print 'Checking fstab for entries ...'; my $hastmpdsk = 0; my $hasvartmpdsk = 0; my $fslock = Cpanel::SafeFile::safeopen( \FSTAB, '+<', '/etc/fstab' ); if ($fslock) { while (<FSTAB>) { if (/^\s\/usr\/tmpDSK/) { $hastmpdsk = 1; } if (/^\s(\S+)\s\/var\/tmp/) { $hasvartmpdsk = 1; } } if ( !$hastmpdsk && $usingTMPDSK ) { print "Added fstab entry (/tmp)...."; print FSTAB "/usr/tmpDSK /tmp ext4 defaults,noauto 0 0\n"; } if ( !$hasvartmpdsk && $vartmpmnt ) { print "Added fstab entry (/var/tmp)...."; print FSTAB "/tmp /var/tmp ext4 defaults,bind,noauto 0 0\n"; } Cpanel::SafeFile::safeclose( \FSTAB, $fslock ); print "Done\n"; } else { $logger->die("Could not edit /etc/fstab"); } my $logrotate = '/etc/cron.daily/logrotate'; if ( -e $logrotate ) { my @logrotate_contents; my $has_tmpdir = 0; if ( open my $logrotate_fh, '<', $logrotate ) { while ( my $line = readline $logrotate_fh ) { if ( $line =~ m/TMPDIR/ && $line !~ m/^\s#/ ) { $has_tmpdir = 1; last; } push @logrotate_contents, $line; } close $logrotate_fh; if ( !$has_tmpdir ) { my $updated_logrotate = 0; if ( open my $logrotate_fh, '>', $logrotate ) { foreach my $line (@logrotate_contents) { if ( $line =~ m/^#!\/(?:usr\|bin)/ ) { print "Adding TMPDIR setting to /etc/cron.daily/logrotate\n"; print {$logrotate_fh} $line; print {$logrotate_fh} "export TMPDIR=/var/spool/logrotate/tmp\n"; $updated_logrotate = 1; } else { print {$logrotate_fh} $line; } } close $logrotate_fh; } if ($updated_logrotate) { if ( !-e '/var/spool/logrotate/tmp' ) { system 'mkdir', '-p', '/var/spool/logrotate/tmp'; } if ( !-d '/var/spool/logrotate/tmp' ) { print <<'EOM'; !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! Logrotate detected and TMPDIR setting updated. The TMPDIR directory (/var/spool/logrotate/tmp) does not exist! Logrotate will need to use this directory for execution of its postrotate scripts. This directory is normally /tmp, but due to /tmp being set as non-executable an alternative directory must be specified. Please correct this issue. See /etc/cron.daily/logrotate to adjust the TMPDIR value for your system. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! EOM } } else { warn "Failed to update /etc/cron.daily/logrotate! Logrotate may be corrupt."; } } else { print "Logrotate TMPDIR already configured\n"; } } } print "Process Complete\n"; Cpanel::Filesys::Mounts::clear_mounts_cache(); exit; ################################################################################ # createtmpdisk ################################################################################ sub createtmpdisk { my $path = shift; my $disk_size = shift \|\| $tmpdsksize; local $ENV{'LC_ALL'} = 'C'; # Force prompt processing to english print "Building ${path}..."; if ( -e $path ) { unlink($path); } my $disk_size_in_m = int( $disk_size / 1024 ) \|\| 1; my $bytes = 1024 * 1024 * $disk_size_in_m; open( my $fh, '>', $path ) or die "Failed to open “$path”: $!"; truncate( $fh, $bytes ) or do { die "truncate($path, $bytes): $!"; }; close($fh); open( my $mkfs, "\|-" ) \|\| exec( "/sbin/mkfs", $path ); print {$mkfs} "yes\r\n"; close($mkfs); if ( -e "/sbin/tune2fs" ) { system( "/sbin/tune2fs", "-j", $path ); } chmod 0600, $path; print "Done\n"; return; } ################################################################################ # archivecopy ################################################################################ sub archivecopy { my ( $origin, $dest ) = @_; my $cpflags = '-af'; return system( "cp", $cpflags, $origin, $dest ); } ################################################################################ # mounttmpdsk ################################################################################ sub mounttmpdsk { my ( $disk_path, $mount_path, $current_mount_opts ) = @_; $current_mount_opts //= ''; # Try to mount ext4 + discard first; if that fails, let the system detect the filesystem. if ( $current_mount_opts !~ m/loop/ ) { if ( system( 'mount', '-t', 'ext4', '-o', 'loop,noexec,nosuid,rw,discard', $disk_path, $mount_path ) ) { system( 'mount', '-o', 'loop,noexec,nosuid,rw', $disk_path, $mount_path ); } } return (0); } sub test_loopback_device { my $loopback_device = shift; system( 'umount', '/usr/testDSK' ); createtmpdisk( '/usr/testDSK', 10240 ); my $tmpfile = Cpanel::TempFile->new(); my $test_mount_path = $tmpfile->dir(); mounttmpdsk( '/usr/testDSK', $test_mount_path ); my $loopback_status = Cpanel::SafeRun::Errors::saferunallerrors( 'losetup', $loopback_device ); system( 'umount', $test_mount_path ); unlink( '/usr/testDSK', $test_mount_path ); return $loopback_status =~ m/\Q$loopback_device\E:.*\/usr\/testDSK/i ? 1 : 0; } sub check_loop_device { my $loopback_device = Cpanel::SafeRun::Errors::saferunallerrors( 'losetup', '-f' ); chomp $loopback_device; return if !$loopback_device \|\| !test_loopback_device($loopback_device); return $loopback_device; } ################################################################################ # reaper ################################################################################ sub reaper { my $thedead; while ( ( $thedead = waitpid( -1, 1 ) ) > 0 ) { # the dead shall do what ? } $SIG{CHLD} = \&reaper; }

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