SkidSec WebShell

Server Address : 172.31.38.4

Web Server : Apache/2.4.58 (Ubuntu)

Uname : Linux ip-172-31-38-4 6.14.0-1017-aws #17~24.04.1-Ubuntu SMP Wed Nov 5 10:48:17 UTC 2025 x86_64

PHP Version : 7.4.33

#!/usr/bin/perl # deluser -- a utility to remove users from the system # delgroup -- a utilty to remove groups from the system my $version = "3.118ubuntu2"; # Copyright (C) 2000 Roland Bauerschmidt <rb@debian.org> # Based on 'adduser' as pattern by # Guy Maor <maor@debian.org> # Ted Hajek <tedhajek@boombox.micro.umn.edu> # Ian A. Murdock <imurdock@gnu.ai.mit.edu> # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # 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. # # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA #################### # See the usage subroutine for explanation about how the program can be called #################### use warnings; use strict; use Getopt::Long; use Debian::AdduserCommon; my $install_more_packages ; BEGIN { local $ENV{PERL_DL_NONLAZY}=1; eval 'use File::Find'; if ($@) { $install_more_packages = 1; } #no warnings "File::Find"; eval 'use File::Temp'; if ($@) { $install_more_packages = 1; } } BEGIN { eval 'use Locale::gettext'; if ($@) { *gettext = sub { shift }; *textdomain = sub { "" }; *LC_MESSAGES = sub { 5 }; } eval { require POSIX; import POSIX qw(setlocale); }; if ($@) { *setlocale = sub { return 1 }; } } setlocale(LC_MESSAGES, ""); textdomain("adduser"); my $action = $0 =~ /delgroup$/ ? "delgroup" : "deluser"; our $verbose = 1; my %pconfig = (); my %config = (); my $configfile; my @defaults; my $force; unless ( GetOptions ("quiet|q" => sub {$verbose = 0; }, "debug" => sub {$verbose = 2; }, "version|v" => sub { &version(); exit 0; }, "help|h" => sub { &usage(); exit 0;}, "group" => sub { $action = "delgroup";}, "conf=s" => \$configfile, "system" => \$pconfig{"system"}, "only-if-empty" => \$pconfig{"only_if_empty"}, "remove-home" => \$pconfig{"remove_home"}, "remove-all-files" => \$pconfig{"remove_all_files"}, "backup" => \$pconfig{"backup"}, "backup-to=s" => \$pconfig{"backup_to"}, "force" => \$force ) ) { &usage; exit 1; } # everyone can issue "--help" and "--version", but only root can go on dief (gtx("Only root may remove a user or group from the system.\n")) if ($> != 0); if (!defined($configfile)) { @defaults = ("/etc/adduser.conf", "/etc/deluser.conf"); } else { @defaults = ($configfile); } # explicitly set PATH, because super (1) cleans up the path and makes deluser unusable; # this is also a good idea for sudo (which doesn't clean up) $ENV{"PATH"}="/bin:/usr/bin:/sbin:/usr/sbin"; my @names = (); my ($user,$group); ###################### # handling of @names # ###################### while (defined(my $arg = shift(@ARGV))) { if (defined($names[0]) && $arg =~ /^--/) { dief (gtx("No options allowed after names.\n")); } else { # it's a username push (@names, $arg); } } if(@names == 0) { if($action eq "delgroup") { print (gtx("Enter a group name to remove: ")); } else { print (gtx("Enter a user name to remove: ")); } chomp(my $answer=<STDIN>); push(@names, $answer); } if (length($names[0]) == 0 || @names > 2) { dief (gtx("Only one or two names allowed.\n")); } if(@names == 2) { # must be deluserfromgroup $action = "deluserfromgroup"; $user = shift(@names); $group = shift(@names); } else { if($action eq "delgroup") { $group = shift(@names); } else { $user = shift(@names); } } undef(@names); ########################################################## # (1) preseed the config # (2) read the default /etc/adduser.conf configuration. # (3) read the default /etc/deluser.conf configuration. # (4) process commmand line settings # last match wins ########################################################## preseed_config (\@defaults,\%config); foreach(keys(%pconfig)) { $config{$_} = $pconfig{$_} if ($pconfig{$_}); } if (($config{remove_home} || $config{remove_all_files} || $config{backup}) && ($install_more_packages)) { fail (8, gtx("In order to use the --remove-home, --remove-all-files, and --backup features, you need to install the `perl' package. To accomplish that, run apt-get install perl.\n")); } my ($pw_uid, $pw_gid, $pw_homedir, $gr_gid, $maingroup); if(defined($user)) { my @passwd = getpwnam($user); $pw_uid = $passwd[2]; $pw_gid = $passwd[3]; $pw_homedir = $passwd[7]; $maingroup = $pw_gid ? getgrgid($pw_gid) : ""; } if(defined($group)) { #($gr_name,$gr_passwd,$gr_gid,$gr_members) = getgrnam($group); my @group = getgrnam($group); $gr_gid = $group[2]; } # arguments are processed: # # $action = "deluser" # $user name of the user to remove # # $action = "delgroup" # $group name of the group to remove # # $action = "deluserfromgroup" # $user the user to be remove # $group the group to remove him/her from if($action eq "deluser") { &invalidate_nscd(); my($dummy1,$dummy2,$uid); # Don't allow a non-system user to be deleted when --system is given # Also, "user does not exist" is only a warning with --system, but an # error without --system. if( $config{"system"} ) { if( ($dummy1,$dummy2,$uid) = getpwnam($user) ) { if ( ($uid < $config{"first_system_uid"} || $uid > $config{"last_system_uid" } ) ) { printf (gtx("The user `%s' is not a system user. Exiting.\n"), $user) if $verbose; exit 1; } } else { printf (gtx("The user `%s' does not exist, but --system was given. Exiting.\n"), $user) if $verbose; exit 0; } } unless(exist_user($user)) { fail (2,gtx("The user `%s' does not exist.\n"),$user); } # Warn in any case if you want to remove the root account if ((defined($pw_uid)) && ($pw_uid == 0) && (!defined($force))) { printf (gtx("WARNING: You are just about to delete the root account (uid 0)\n")); printf (gtx("Usually this is never required as it may render the whole system unusable\n")); printf (gtx("If you really want this, call deluser with parameter --force\n")); printf (gtx("Stopping now without having performed any action\n")); exit 9; } # consistency check # if --backup-to is specified, --backup should be set too if ($pconfig{"backup_to"}) { $config{"backup"} = 1; } if($config{"remove_home"} || $config{"remove_all_files"}) { s_print (gtx("Looking for files to backup/remove ...\n")); my @mountpoints; open(MOUNT, "mount |") || fail (4 ,gtx("fork for `mount' to parse mount points failed: %s\n", $!)); while (<MOUNT>) { my @temparray = split; my $fstype = $temparray[4]; my $exclude_fstypes = $config{"exclude_fstypes"}; if (defined($exclude_fstypes)) { next if ($fstype =~ /$exclude_fstypes/); } push @mountpoints,$temparray[2]; } close(MOUNT) or dief (gtx("pipe of command `mount' could not be closed: %s\n",$!)); my(@files,@dirs); if($config{"remove_home"} && ! $config{"remove_all_files"}) { # collect all files in user home sub home_match { # according to the manpage foreach my $mount (@mountpoints) { if( $File::Find::name eq $mount ) { s_printf (gtx("Not backing up/removing `%s', it is a mount point.\n"),$File::Find::name); $File::Find::prune=1; return; } } foreach my $re ( split ' ', $config{"no_del_paths"} ) { if( $File::Find::name =~ qr/$re/ ) { s_printf (gtx("Not backing up/removing `%s', it matches %s.\n"),$File::Find::name,$re); $File::Find::prune=1; return; } } push(@files, $File::Find::name) if(-f $File::Find::name || -l $File::Find::name); push(@dirs, $File::Find::name) if(-d $File::Find::name); } # sub home_match # collect ecryptfs config files not stored in $HOME sub ecryptfs_match { if ( $File::Find::name !~ m[^/var/lib/ecryptfs/\Q$user] && $File::Find::name !~ m[^/home/\.ecryptfs/\Q$user]) { $File::Find::prune=1; return; } push(@files, $File::Find::name) if(-f $File::Find::name || -l $File::Find::name); push(@dirs, $File::Find::name) if(-d $File::Find::name); } # sub ecryptfs_match File::Find::find({wanted => \&home_match, untaint => 1, no_chdir => 1}, $pw_homedir) if(-d "$pw_homedir"); if(-d "/var/lib/ecryptfs/$user") { File::Find::find({wanted => \&ecryptfs_match, untaint => 1, no_chdir => 1}, "/var/lib/ecryptfs/$user"); } elsif (-d "/home/.ecryptfs/$user") { File::Find::find({wanted => \&ecryptfs_match, untaint => 1, no_chdir => 1}, "/home/.ecryptfs/$user"); } push(@files, "/var/mail/$user") if(-e "/var/mail/$user"); } else { # collect all files on system belonging to that user sub find_match { my ($dev,$ino,$mode,$nlink,$uid,$gid); (($dev,$ino,$mode,$nlink,$uid,$gid) = lstat($_)) && ($uid == $pw_uid) && ( ($File::Find::name =~ /^\/proc\// && ($File::Find::prune = 1)) || (-f $File::Find::name && push(@files, $File::Find::name)) || (-l $File::Find::name && push(@files, $File::Find::name)) || (-d $File::Find::name && push(@dirs, $File::Find::name)) || (-S $File::Find::name && push(@dirs, $File::Find::name)) || (-p $File::Find::name && push(@dirs, $File::Find::name)) ); if ( -b $File::Find::name || -c $File::Find::name ) { warnf (gtx("Cannot handle special file %s\n"),$File::Find::name); } } # sub find_match File::Find::find({wanted => \&find_match, untaint => 1, no_chdir => 1}, '/'); } if($config{"backup"}) { s_printf (gtx("Backing up files to be removed to %s ...\n"),$config{"backup_to"}); my $filesfile = new File::Temp(TEMPLATE=>"deluser.XXXXX", DIR=>"/tmp"); my $filesfilename = $filesfile->filename; my $backup_name = $config{"backup_to"} . "/$user.tar"; print "backup_name = $backup_name\n"; print $filesfile join("\n",@files); $filesfile->close(); my $tar = &which('tar'); my $bzip2 = &which('bzip2', 1); my $gzip = &which('gzip', 1); my $options = ''; if($bzip2) { $backup_name = "$backup_name.bz2"; $options = "--bzip2"; } elsif($gzip) { $backup_name = "$backup_name.gz"; $options = "--gzip"; } &systemcall($tar, $options, "-cf", $backup_name, "--files-from", $filesfilename); chmod 0600, $backup_name; my $rootid = 0; chown $rootid, $rootid, $backup_name; unlink($filesfilename); } if(@files || @dirs) { s_print (gtx("Removing files ...\n")); unlink(@files) if(@files); foreach(reverse(sort(@dirs))) { rmdir($_); } } } if (system("crontab -l $user >/dev/null 2>&1") == 0) { # crontab -l returns 1 if there is no crontab my $crontab = &which('crontab'); &systemcall($crontab, "-r", $user); s_print (gtx("Removing crontab ...\n")); } s_printf (gtx("Removing user `%s' ...\n"),$user); my @members = get_group_members($maingroup); if (@members == 0) { s_printf (gtx("Warning: group `%s' has no more members.\n"), $maingroup); } my $userdel = &which('userdel'); &systemcall($userdel, $user); &invalidate_nscd(); systemcall('/usr/local/sbin/deluser.local', $user, $pw_uid, $pw_gid, $pw_homedir) if (-x "/usr/local/sbin/deluser.local"); s_print (gtx("Done.\n")); exit 0; } if($action eq "delgroup") { &invalidate_nscd(); unless(exist_group($group)) { printf( gtx("The group `%s' does not exist.\n"),$group) if $verbose; exit 3; } my($dummy,$gid,$members); if( !(($dummy, $dummy, $gid, $members ) = getgrnam($group)) ) { fail (4 ,gtx("getgrnam `%s' failed. This shouldn't happen.\n"), $group); } if( $config{"system"} && ($gid < $config{"first_system_gid"} || $gid > $config{"last_system_gid" } )) { printf (gtx("The group `%s' is not a system group. Exiting.\n"), $group) if $verbose; exit 3; } if( $config{"only_if_empty"} && $members ne "") { fail (5, gtx("The group `%s' is not empty!\n"),$group); } setpwent; while ((my $acctname,my $primgrp) = (getpwent)[0,3]) { if( $primgrp eq $gr_gid ) { fail (7, gtx("`%s' still has `%s' as their primary group!\n"),$acctname,$group); } } endpwent; s_printf (gtx("Removing group `%s' ...\n"),$group); my $groupdel = &which('groupdel'); &systemcall($groupdel,$group); &invalidate_nscd(); s_print (gtx("Done.\n")); exit 0; } if($action eq "deluserfromgroup") { &invalidate_nscd(); unless(exist_user($user)) { fail (2, gtx("The user `%s' does not exist.\n"),$user); } unless(exist_group($group)) { fail (3, gtx("The group `%s' does not exist.\n"),$group); } if($maingroup eq $group) { fail (7, gtx("You may not remove the user from their primary group.\n")); } my @members = get_group_members($group); my $ismember = 0; for(my $i = 0; $i <= $#members; $i++) { if($members[$i] eq $user) { $ismember = 1; splice(@members,$i,1); } } unless($ismember) { fail (6, gtx("The user `%s' is not a member of group `%s'.\n"),$user,$group); } s_printf (gtx("Removing user `%s' from group `%s' ...\n"),$user,$group); #systemcall("usermod","-G", join(",",@groups), $user ); my $gpasswd = &which('gpasswd'); &systemcall($gpasswd,'-M', join(',',@members), $group); &invalidate_nscd(); s_print (gtx("Done.\n")); } ###### sub fail { my ($errorcode, $format, @args) = @_; printf STDERR "$0: $format",@args; exit $errorcode; } sub version { printf (gtx("deluser version %s\n\n"), $version); printf (gtx("Removes users and groups from the system.\n")); printf gtx("Copyright (C) 2000 Roland Bauerschmidt <roland\@copyleft.de>\n\n"); printf gtx("deluser is based on adduser by Guy Maor <maor\@debian.org>, Ian Murdock\n". "<imurdock\@gnu.ai.mit.edu> and Ted Hajek <tedhajek\@boombox.micro.umn.edu>\n\n"); printf gtx("This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. 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, /usr/share/common-licenses/GPL, for more details.\n"); } sub usage { printf gtx( "deluser USER remove a normal user from the system example: deluser mike --remove-home remove the users home directory and mail spool --remove-all-files remove all files owned by user --backup backup files before removing. --backup-to <DIR> target directory for the backups. Default is the current directory. --system only remove if system user delgroup GROUP deluser --group GROUP remove a group from the system example: deluser --group students --system only remove if system group --only-if-empty only remove if no members left deluser USER GROUP remove the user from a group example: deluser mike students general options: --quiet | -q don't give process information to stdout --help | -h usage message --version | -v version number and copyright --conf | -c FILE use FILE as configuration file\n\n"); } sub exist_user { my $exist_user = shift; return(defined getpwnam($exist_user)); } sub exist_group { my $exist_group = shift; return(defined getgrnam($exist_group)); } # vim:set ai et sts=4 sw=4 tw=0: