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Filename : suspendacct
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#!/usr/local/cpanel/3rdparty/bin/perl

# cpanel - scripts/suspendacct                     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

package scripts::suspendacct;

use strict;
## no critic qw(TestingAndDebugging::RequireUseWarnings) -- suspendacct is not yet warnings safe

use Try::Tiny;

use Whostmgr::ACLS                             ();
use Cpanel::Auth::Digest::DB::Manage           ();
use Cpanel::Auth::Shadow                       ();
use Cpanel::AcctUtils::AccountingLog           ();
use Cpanel::AcctUtils::DomainOwner::Tiny       ();
use Cpanel::AcctUtils::Owner                   ();
use Cpanel::AcctUtils::Domain                  ();
use Cpanel::Config::LoadCpUserFile             ();
use Cpanel::PwCache::Clear                     ();
use Cpanel::Validate::Domain::Tiny             ();
use Cpanel::Encoder::Tiny                      ();
use Cpanel::Exception                          ();
use Cpanel::Dovecot::Action                    ();
use Cpanel::AccessIds::ReducedPrivileges       ();
use Cpanel::AcctUtils::Suspended               ();
use Cpanel::SafetyBits                         ();
use Cpanel::Config::CpUserGuard                ();
use Cpanel::ConfigFiles                        ();
use Cpanel::FileUtils::Copy                    ();
use Cpanel::FileUtils::Match                   ();
use Cpanel::FileUtils::Write                   ();
use Cpanel::Hooks                              ();
use Cpanel::Hostname                           ();
use Cpanel::IP::Remote                         ();
use Cpanel::MysqlUtils::Suspension             ();
use Cpanel::SafeFile                           ();
use Cpanel::Sys::Kill                          ();
use Cpanel::OS                                 ();
use Cpanel::Passwd::Shell                      ();
use Cpanel::ServerTasks                        ();
use Cpanel::Services::Enabled                  ();
use Cpanel::Session::SinglePurge               ();
use Cpanel::PwCache                            ();
use Cpanel::Validate::Username                 ();
use Cpanel::Validate::Domain::Normalize        ();
use Cpanel::Quota::Temp                        ();
use Whostmgr::Accounts::Suspend                ();
use Whostmgr::Accounts::Email                  ();
use Whostmgr::Accounts::SuspensionData::Writer ();
use AcctLock                                   ();
use Cpanel::Notify                             ();
use Getopt::Long                               ();
use Cpanel::Team::Constants                    ();
use Cpanel::Team::Config                       ();

exit( run(@ARGV) ) unless caller;

sub run {    ## no critic qw(Subroutines::ProhibitExcessComplexity)
    my (@args) = @_;

    my $leave_ftp_enabled = 0;
    my $usage             = 0;
    my $force             = 0;
    my $child_ok          = 0;
    return usage(1) if !@args;

    Getopt::Long::GetOptionsFromArray(
        \@args,
        'leave-ftp-accts-enabled' => \$leave_ftp_enabled,
        'help|usage'              => \$usage,
        'force'                   => \$force,
        'child-ok'                => \$child_ok,
    );

    my $user = $args[0];
    $user =~ s/\///g;
    my $reason = Cpanel::Encoder::Tiny::safe_html_decode_str( $args[1] // '' );
    $reason =~ s/[=\n\0]//g;
    my $prevent_reseller_unsuspend = $args[2] // 0;

    return usage(0) if $usage;
    return usage(1) if ( !$user || is_forbidden_user($user) );

    local $ENV{'USER'}        = $ENV{'USER'};
    local $ENV{'REMOTE_USER'} = $ENV{'REMOTE_USER'};

    if ( ( !$ENV{'USER'} || !$ENV{'REMOTE_USER'} ) && $> == 0 ) {
        $ENV{'REMOTE_USER'} = 'root';
        $ENV{'USER'}        = 'root';
    }

    # Needed for changing quotas.
    Whostmgr::ACLS::init_acls();

    return usage( 1, "Invalid user $user\n" ) if !is_valid_user($user);

    if ( $prevent_reseller_unsuspend && !Whostmgr::ACLS::hasroot() ) {
        print "Can not prevent resellers from unsuspending this account without the 'all' ACL.\n";
        return 1;
    }

    if ( $leave_ftp_enabled && !Whostmgr::ACLS::hasroot() ) {
        print "Can not leave FTP accounts enabled without the 'all' ACL.\n";
        return 1;
    }

    if ( Cpanel::AcctUtils::Suspended::is_suspended($user) && !$force ) {
        print "User '$user' is already suspended. Provide '--force' argument if you wish to do this.\n";
        return 1;
    }

    if ( !$child_ok ) {
        my $cpuser_obj = Cpanel::Config::LoadCpUserFile::load_or_die($user);
        if ( $cpuser_obj->child_workloads() ) {
            print "To suspend “$user”, do so on the account’s parent node.\n";
            return 1;
        }
    }

    # this one doesn't seem to exist
    if ( !do_hook( $user, $reason, $prevent_reseller_unsuspend, 'pre' ) ) {
        print "Pre-suspend hook script returned failure.\n";
        return 1;
    }
    system '/usr/local/cpanel/scripts/presuspendacct', @args if -x '/usr/local/cpanel/scripts/presuspendacct';

    $ENV{'REMOTE_USER'} ||= 'root';
    Whostmgr::ACLS::init_acls();

    my ( $pass, $homedir, $shell ) = ( Cpanel::PwCache::getpwnam($user) )[ 1, 7, 8 ];
    my $host;

    AcctLock::acctlock();
    print "Changing Shell to /bin/false...";
    try {
        Cpanel::Passwd::Shell::update_shell_without_acctlock( 'user' => $user, 'shell' => '/bin/false' );
    }
    catch {
        print Cpanel::Exception::get_string($_);
    };
    print "Done\n";

    print "Locking Password...";
    my ( $status, $statusmsg ) = Cpanel::Auth::Shadow::update_shadow_without_acctlock( $user, '!!' . ( Cpanel::PwCache::getpwnam($user) )[1] );
    print $statusmsg if !$status;
    print "Done\n";
    AcctLock::acctunlock();

    Cpanel::Auth::Digest::DB::Manage::lock($user) if Cpanel::Auth::Digest::DB::Manage::has_entry($user);

    my $owner = Cpanel::AcctUtils::Owner::getowner($user);
    $owner =~ s/\n//g;

    my $domain = Cpanel::AcctUtils::Domain::getdomain($user);

    if ( $owner eq '' || $owner eq 'root' || $user eq $owner ) {
        $host = Cpanel::Hostname::gethostname();
    }
    else {
        $host = $domain;
    }
    if ( !$host ) {
        $host = Cpanel::Hostname::gethostname();
    }

    my $susp_info_hr = {
        'shell'                   => $shell,
        'leave-ftp-accts-enabled' => $leave_ftp_enabled,
    };

    my $suspend_data = Whostmgr::Accounts::SuspensionData::Writer->new();

    if ( $prevent_reseller_unsuspend == 1 ) {
        $suspend_data->suspend_locked( $user, $reason // q<>, $susp_info_hr );
    }
    else {
        $suspend_data->suspend_unlocked( $user, $reason // q<>, $susp_info_hr );
    }

    # session deletion and then
    # kill -9 must be done after the suspendfile is created
    # to ensure cpsrvd will not allow any more processes
    # to be created as the user.  this also avoids having to check
    # each cpsrvd request
    Cpanel::Session::SinglePurge::purge_user( $user, 'suspend' );
    Cpanel::Sys::Kill::kill_pids_owned_by( $user, '-9' );

    my $cpuser_guard = Cpanel::Config::CpUserGuard->new($user);
    my $cpuser_data  = $cpuser_guard->{'data'};
    my @DNS          = ( $cpuser_data->{'DOMAIN'} );
    if ( exists $cpuser_data->{'DOMAINS'} ) {
        push @DNS, @{ $cpuser_data->{'DOMAINS'} };
    }

    mkdir( "$Cpanel::ConfigFiles::MAILMAN_ROOT/suspended.lists", 0755 );

    {
        my $tempquota = Cpanel::Quota::Temp->new( user => $user );
        $tempquota->disable();

        if ( -f "$homedir/etc/webdav/shadow" && !-l "$homedir/etc/webdav/shadow" ) {
            print "Suspending webdav users\n";
            suspendshadowfile( $user, "$homedir/etc/webdav/shadow" );
        }

        foreach my $dns (@DNS) {
            $dns = Cpanel::Validate::Domain::Normalize::normalize( $dns, 1 );
            next if !Cpanel::Validate::Domain::Tiny::validdomainname($dns);
            if ( -f "${homedir}/etc/${dns}/shadow"
                && !-l "${homedir}/etc/${dns}/shadow" ) {
                print "Suspending email account logins for ${dns} .... ";
                suspendshadowfile( $user, "${homedir}/etc/${dns}/shadow" );
                print "Done\n";
            }
        }

        #This will recreate the files in the user homedir,
        #so we want to do it under a quota-lift.
        Cpanel::Dovecot::Action::flush_all_auth_caches_for_user($user);
    }

    # Suspend team_user's if exists.
    if ( -e "$Cpanel::Team::Constants::TEAM_CONFIG_DIR/$user" ) {
        print "Suspending team account ... ";
        eval { Cpanel::Team::Config->new($user)->suspend_team(); };
        $@ ? warn "Unable to suspend Team Account" : print "Done\n";
    }

    my $dns_list   = join( '|', map { quotemeta($_) } @DNS );
    my $list_files = Cpanel::FileUtils::Match::get_matching_files( "$Cpanel::ConfigFiles::MAILMAN_ROOT/lists", "_(?:$dns_list)" . '$' );
    foreach my $list ( @{$list_files} ) {
        my ($list_name) = $list =~ m{^.*/([^/]+)$};
        $list_name =~ tr{_}{@};
        print "Suspending mailing list for $list_name\n";

        my $suspended_list = $list;
        $suspended_list =~ s/\/lists\//\/suspended.lists\//;
        if ( -e $suspended_list ) { rename( $suspended_list, $suspended_list . '.' . time() ) }
        rename( $list, $suspended_list );
    }

    if ( Cpanel::Services::Enabled::are_provided('mysql') ) {
        print "Suspending mysql users\n";
        Cpanel::MysqlUtils::Suspension::suspend_mysql_users($user);
    }

    # FIXME: Everything in this script should eventually be done via
    # this function call (or similar logic).
    try {
        Whostmgr::Accounts::Suspend->new(
            $user,
            reason                     => $reason,
            prevent_reseller_unsuspend => $prevent_reseller_unsuspend,
        );
    }
    catch {
        warn Cpanel::Exception::get_string($_);
    };

    my %account_creation_notification = (
        'user'              => $user,
        'user_domain'       => $domain,
        'reason'            => $reason,
        'env_remote_user'   => $ENV{'REMOTE_USER'},
        'env_user'          => $ENV{'USER'},
        'host_server'       => $host,
        'origin'            => 'Suspend Account',
        'source_ip_address' => Cpanel::IP::Remote::get_current_remote_ip(),
    );

    # send root notification

    Cpanel::Notify::notification_class(
        'class'            => 'suspendacct::Notify',
        'application'      => 'suspendacct::Notify',
        'constructor_args' => [%account_creation_notification]
    );

    # send one to account reseller as well as long as they are not root
    if ( $owner ne 'root' ) {
        Cpanel::Notify::notification_class(
            'class'            => 'suspendacct::Notify',
            'application'      => 'suspendacct::Notify',
            'constructor_args' => [ %account_creation_notification, 'to' => $owner, 'username' => $owner ]
        );
    }

    if ( $pass =~ /^\!/ || $pass =~ /^\*/ ) {
        print "Account previously suspended (password was locked).\n";
    }

    $cpuser_data->{'SUSPENDTIME'} = time();
    $cpuser_data->{'SUSPENDED'}   = 1;
    $cpuser_guard->save();

    my $user_crontab_dir = Cpanel::OS::user_crontab_dir();
    if ( !-e "$user_crontab_dir.suspended" ) {
        mkdir( "$user_crontab_dir.suspended", 0700 );
    }

    if ( -f "$user_crontab_dir/${user}" ) {
        link( "$user_crontab_dir/${user}", "$user_crontab_dir.suspended/${user}" );
        unlink("$user_crontab_dir/${user}");
    }

    Cpanel::SafetyBits::safe_chmod( 0000, $user, "${homedir}/public_ftp" );

    my $tempquota = Cpanel::Quota::Temp->new( user => $user );
    $tempquota->disable();
    print "Suspending websites...\n";

    _generate_account_suspension_include($user);

    $tempquota->restore();

    _suspend_ftp($user) if not $leave_ftp_enabled;

    Cpanel::ServerTasks::schedule_task( ['CpDBTasks'], 10, "ftpupdate" );

    print "Suspending outgoing email....";
    Whostmgr::Accounts::Email::suspend_outgoing_email( 'user' => $user );
    print "Done\n";

    print ${user} . "'s account has been suspended\n";

    Cpanel::AcctUtils::AccountingLog::append_entry( 'SUSPEND', [ $user, $domain, $reason ] );

    Cpanel::PwCache::Clear::clear_global_cache();

    do_hook( $user, $reason, $prevent_reseller_unsuspend, 'post' );
    system '/usr/local/cpanel/scripts/postsuspendacct', @args if -x '/usr/local/cpanel/scripts/postsuspendacct';

    return;
}

# TODO: Refactor this function (along with the unsuspension logic)
# to a Whostmgr::Accounts::Suspension::* module.
sub _suspend_ftp {
    my ($username) = @_;

    my $ftpfile = "$Cpanel::ConfigFiles::FTP_PASSWD_DIR/$username";
    my $ftplock = Cpanel::SafeFile::safelock($ftpfile);               # Manipulation of these files isn't thread safe.

    if ( -e $ftpfile && !-e $ftpfile . '.suspended' && -e "/var/cpanel/suspended/$username" ) {
        print "Suspending FTP accounts...\n";
        my ( $ok, $err ) = Cpanel::FileUtils::Copy::copy( $ftpfile, qq{$ftpfile.suspended} );

        if ($err) {
            warn "Could not copy $ftpfile to $ftpfile.suspended: $err";
        }
        else {
            Cpanel::FileUtils::Write::overwrite_no_exceptions( $ftpfile, '# Account suspended', 0640 );
        }
    }

    Cpanel::SafeFile::safeunlock($ftplock);

    return;
}

sub is_valid_user {
    my $user = shift;

    my $pass = ( Cpanel::PwCache::getpwnam_noshadow($user) )[1];
    if ( !defined $pass ) {
        $user = Cpanel::AcctUtils::DomainOwner::Tiny::getdomainowner( $user, { 'default' => '' } );
        return 0 if !$user;

        $pass = ( Cpanel::PwCache::getpwnam_noshadow($user) )[1];
        return 0 if !defined $pass;
    }

    return is_forbidden_user($user) ? 0 : 1;
}

sub is_forbidden_user {
    my ($user) = @_;

    return ( grep { $user eq $_ } Cpanel::Validate::Username::list_reserved_usernames() ) ? 1 : 0;
}

# helpers
sub suspendshadowfile {
    my ( $user, $file ) = @_;

    # user cannot be root, tested previously
    # we should not write file as root in the user's home directory...
    my $access_ids = Cpanel::AccessIds::ReducedPrivileges->new($user);
    return _suspendshadowfile($file);
}

sub _suspendshadowfile {
    my ($file) = @_;

    my @shadow_file;
    my $shadowlock = Cpanel::SafeFile::safeopen( \*SHF, '<', $file );
    if ($shadowlock) {
        @shadow_file = <SHF>;
        Cpanel::SafeFile::safeclose( \*SHF, $shadowlock );
        undef $shadowlock;
    }
    else {
        if ( -e $file ) {
            warn "Failed to read $file: $!";
            return;
        }
        else {
            return 1;
        }
    }

    if (@shadow_file) {
        $shadowlock = Cpanel::SafeFile::safeopen( \*SHF, '>', $file );

        if ($shadowlock) {
            foreach (@shadow_file) {
                chomp;
                next if $_ !~ m{\S};    # ensure we're not processing a blank line.
                my @DC = split( /:/, $_ );
                foreach my $field ( 1, 8 ) {
                    $DC[$field] = '' unless defined $DC[$field];
                    if ( $DC[$field] !~ m/^\*LOCKED\*/ ) {
                        $DC[$field] = "*LOCKED*" . $DC[$field];
                    }
                }
                print SHF join( ':', map { defined $_ ? $_ : '' } @DC ) . "\n";
            }
            truncate( SHF, tell(SHF) );
            Cpanel::SafeFile::safeclose( \*SHF, $shadowlock );
        }
        else {
            warn "Failed to update $file: $!";
            return;
        }
        return 1;
    }
    else {
        return 1;
    }
}

sub do_hook {
    my ( $user, $reason, $prevent_reseller_unsuspend, $stage ) = @_;
    my ( $result, $hooks_msgs ) = Cpanel::Hooks::hook(
        {
            'category'      => 'Whostmgr',
            'event'         => 'Accounts::suspendacct',
            'stage'         => $stage,
            'escalateprivs' => 1,
        },
        {
            'args' => {
                'user'       => $user,
                'reason'     => $reason,
                'disallowun' => $prevent_reseller_unsuspend,
            },
            'result' => 1,
            'user'   => 'root',
        },
    );
    if ( ref $hooks_msgs eq 'ARRAY' && @$hooks_msgs != 0 ) {
        foreach my $error ( @{$hooks_msgs} ) {
            print $error;
        }
        return 0;
    }
    return 1;
}

sub _generate_account_suspension_include {
    require "/usr/local/cpanel/scripts/generate_account_suspension_include";    ## no critic qw(Modules::RequireBarewordIncludes) -- refactoring this is too large
    generate_account_suspension_include::update_include_and_restart_httpd();
    return 1;
}

sub usage {
    my ( $retval, $msg ) = @_;
    my $fh = $retval ? \*STDERR : \*STDOUT;

    my $p = $0;
    $p =~ s{^.+/(.+)$}{$1};

    if ( !defined $msg ) {
        $msg = <<EOF;
Usage: $p user [reason] [disallow] [--leave-ftp-accts-enabled] [--child-ok] [--force] [--usage | --help]

Suspend a user's account with possibly a more stringent
suspension as determined by disallow.

where
    user -- is a valid user name (required)

    reason -- is a quote bound description for the suspension
    and is written into the /var/cpanel/suspended/<user> file
    (optional)

    disallow -- is for additionally generating a user.lock file
    in /var/cpanel/suspended and to issue this the argument needs to
    be 1 (optional)

    Note that the order of user, reason and disallow must be maintained.

    Users with reserved usernames (e.g. root and nobody) cannot be suspended.

    --leave-ftp-accts-enabled -- FTP accounts associated with the
    cPanel account are left enabled. **WARNING** Do not use this flag unless
    you have considered the security implications. This will allow suspended
    users continued access to the server.

    The --force argument will allow for the suspension process to be run against an
    already suspended account.

    The --child-ok argument defeats the usual protection against
    suspending distributed accounts on child nodes. Ordinarily you should
    suspend and unsuspend distributed accounts on their parent nodes.
    Use of this flag is UNSUPPORTED.

    Now supports driving instructions via --help, --usage
EOF
    }

    print {$fh} $msg;
    return $retval;
}

1;