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#!/bin/bash
eval '/usr/local/cpanel/scripts/fix-cpanel-perl && exec /usr/local/cpanel/3rdparty/bin/perl -x -- $0 ${1+"$@"}'    ## no critic qw(ProhibitStringyEval RequireUseStrict RequireUseWarnings)
  if 0;

#!/usr/bin/perl
# cpanel - scripts/check_cpanel_pkgs                 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::check_cpanel_pkgs;

# This script will handle repairing/listing broken RPMs
# -
# Q: What is a broken aka altered RPM?
# A: Any files output by a rpm -V RPM_PACKAGE_NAME that are listed to have a different MD5 sum or permission change indicate a broken RPM.

use strict;
use warnings;

use Cpanel::Usage               ();
use Cpanel::Update::Logger      ();
use Cpanel::RPM::Versions::File ();
use Cpanel::TempFile            ();
use Cpanel::LoadModule          ();

exit __PACKAGE__->script(@ARGV) unless caller();

sub script {
    my ( $class, @argv ) = @_;

    local $| = 1;

    my $list_only         = 0;
    my $long_list         = 0;
    my $fix               = 0;
    my $contact           = 0;
    my $targets           = 0;
    my $nodir             = 0;
    my $skip_digest_check = 0;
    my $skip_broken_check = 0;
    my $download_only     = 0;

    my %opts = (
        'long-list'     => \$long_list,
        'list-only'     => \$list_only,
        'fix'           => \$fix,
        'notify'        => \$contact,
        'targets'       => \$targets,
        'nodir'         => \$nodir,
        'no-digest'     => \$skip_digest_check,
        'no-broken'     => \$skip_broken_check,
        'download-only' => \$download_only,
    );

    my $self = bless {
        'notification_rpms' => [],
    }, $class;

    my $status = Cpanel::Usage::wrap_options( { strict => 1 }, \@argv, \&usage, \%opts ) || 0;
    usage(1) if $status > 2;
    usage(1) if ( $list_only && $fix );

    my $logger = Cpanel::Update::Logger->new( { 'stdout' => 1, 'log_level' => 'info' } );

    my $temp;
    my %directory_options = ();
    if ($nodir) {
        $temp = Cpanel::TempFile->new;
        my $tempdir = $temp->dir;
        $directory_options{'directory'} = $tempdir;
    }

    my $v;
    if ($targets) {
        my @targets = split( /\s*,\s*/, $targets );
        $v = Cpanel::RPM::Versions::File->new( { 'only_targets' => \@targets, logger => $logger, %directory_options } );
    }
    else {
        $v = Cpanel::RPM::Versions::File->new( { logger => $logger, %directory_options } );
    }

    # need to be sure that the update config is saved if we detect an *disable file
    $v->dir_files()->save() if $v->dir_files()->config_changed();

    my $found = 0;

    my $installed_rpms = $v->list_rpms_in_state("installed");
    my $upgraded_rpms  = $v->list_rpms_in_state("upgraded");

    my $missing_rpms = $v->install_hash( $installed_rpms, $upgraded_rpms );

    if (%$missing_rpms) {
        $found++;

        log_header($logger);
        $logger->info("The following packages are missing from your system:");

        foreach my $rpm ( sort keys %$missing_rpms ) {
            $logger->info("$rpm-$missing_rpms->{$rpm}");
            $self->_store_rpm_for_notify( "$rpm-$missing_rpms->{$rpm}", 'missing' );
        }
    }

    my $unnecessary_rpms = $v->uninstall_hash($installed_rpms);

    if (%$unnecessary_rpms) {
        $found++;
        log_header($logger);
        $logger->info(" ");
        $logger->info("The following packages are unneeded on your system and should be uninstalled:");

        foreach my $rpm ( sort keys %$unnecessary_rpms ) {
            $logger->info("$rpm-$unnecessary_rpms->{$rpm}");
            $self->_store_rpm_for_notify( "$rpm-$unnecessary_rpms->{$rpm}", 'unnecessary' );

        }
    }

    # The hash reference returned by get_dirty_rpms() looks like:
    # {
    #    'nsd,3.2.9-2.cp1136' => [
    #                               '/etc/nsd'
    #                            ]
    # };

    # Delete cached results otherwise this will need to be run twice if a RPM is altered.
    # NOTE: This was changed recently. $v->reinstall is responsible for clearing this cache when appropriate.
    # I will remove these comments in a future commit but leaving it here so the bug is obvious in the short
    # term if it comes up.
    #
    #unless ($skip_broken_check) {
    #    $v->clear_installed_packages_cache;
    #}

    # Suppress warnings from get_dirty_rpms call.
    $v->logger->set_logging_level('ERROR');
    my $broken_rpms = $skip_broken_check ? {} : $v->get_dirty_rpms($skip_digest_check);
    $v->logger->set_logging_level('INFO');

    my @broken_rpms_list = sort keys %$broken_rpms;

    if (%$broken_rpms) {
        $found++;

        log_header($logger);
        $logger->info(" ");
        $logger->info("The following files were found to be altered from their original package form:") if ( !$long_list );
        foreach my $rpm ( sort keys %$broken_rpms ) {
            foreach ( @{ $broken_rpms->{$rpm} } ) {
                my ( $broken_file, $reason ) = @$_;
                $logger->info("$rpm,$reason,$broken_file") if $long_list;
                $self->_store_rpm_for_notify( "$rpm-$broken_file", 'broken', $reason );

            }
            $logger->info("$rpm") if !$long_list;
        }

        $logger->info(" ");
    }

    if ($found) {

        # Fix if necessary.
        if ($download_only) {
            $v->download_all();
        }
        elsif ( !$list_only ) {
            if ( !$fix ) {
                $fix = prompt('Do you want to repair these packages?');
            }

            if ($fix) {
                $v->logger->{'stdout'} = 1;
                $v->logger->set_logging_level('INFO');
                $v->reinstall_rpms(@broken_rpms_list);
                foreach my $rpm ( @{ $self->{'notification_rpms'} } ) {

                    # TODO: reinstall_rpms assumes success here
                    $rpm->{'status'} = $rpm->{'status'} eq 'broken' ? 'repaired' : $rpm->{'status'};
                }
            }

        }

        $self->notify() if $contact;
    }

    return $logger->get_need_notify ? 2 : 0;
}

sub _store_rpm_for_notify {
    my ( $self, $rpm, $status, $info ) = @_;

    push @{ $self->{'notification_rpms'} }, {
        'rpm'    => $rpm,
        'status' => $status,    #unnecessary #broken #missing #repaired
        'info'   => $info,
    };

    return 1;
}

sub notify {
    my ($self) = @_;

    Cpanel::LoadModule::load_perl_module("Cpanel::iContact::Class::Check::CpanelPackages") || return;

    require Cpanel::Notify;
    Cpanel::Notify::notification_class(
        'class'            => 'Check::CpanelPackages',
        'application'      => 'Check::CpanelPackages',
        'constructor_args' => [
            origin => 'rpmcheck',
            rpms   => $self->{'notification_rpms'},
        ]
    );
}

sub prompt {
    return 0 if ( !-t STDIN );

    print shift @_;

    my $response = '';

    eval { require Term::ReadKey };
    unless ($@) {
        local $SIG{INT} = sub { Term::ReadKey::ReadMode( 'restore', *STDIN ); exit };
        Term::ReadKey::ReadMode( 'noecho', *STDIN );
        Term::ReadKey::ReadMode( 'raw',    *STDIN );

        $response = '';
        while ( $response !~ m{^[ynYN]$} ) {
            print "(y/n):\n";
            $response = getc(*STDIN);
        }

        Term::ReadKey::ReadMode( 'restore', *STDIN );
        print "$response\n";
    }
    else {
        my $response = <>;
        while ( $response !~ m{^[ynYN]$} ) {
            print "(y/n):\n";
            $response = getc(*STDIN);
        }
    }
    return ( $response =~ m{[yY]} ) ? 1 : 0;
}

{
    my $_has_header;

    sub log_header {
        return if $_has_header;
        my ($logger) = @_;
        my $header .= <<END;
Problems were detected with cPanel-provided files which are controlled by packages.
If you did not make these changes intentionally, you can correct them by running:

> /usr/local/cpanel/scripts/check_cpanel_pkgs --fix

END
        $logger->info('');
        foreach my $line ( split( /\n/, $header ) ) {
            $logger->info($line);
        }

        $_has_header = 1;
    }
}

sub usage {
    my $exit_code    = shift || 0;
    my $program_name = $0;
    $program_name =~ s{/usr/local/cpanel/}{};

    # TODO: Describe the output on Debian-like systems.
    print qq{
    $program_name
      Responsible for validating the integrity of cPanel-managed packages and their corresponding files.
      This script detects if there are any packages that have been unexpectedly altered. Files are
      considered altered:

       - If their ownership has changed,
       - If they contain an MD5 mismatch
       - If they are a symlink, the file points to the wrong path.

      Any packages that should be installed or uninstalled will also be detected.

      $program_name offers the opportunity to repair these issues by reinstalling the package that contains the
      altered file(s).

    Usage:
      $program_name [options]

    Options:
      --fix       - Show any problems and automatically correct them.
      --list-only - Only list altered packages and then exit.
      --download-only - Downloads packages and exit
      --long-list - Show in a more easily parsed format the altered packages and files.
      --notify    - Send out a notification regarding any altered packages Additionally,
                    it will describe any action that was taken.
      --targets   - Filter packages based on provided targets (comma delimited).
      --nodir     - This option will prevent the directory /var/cpanel/rpm.versions.d from being read.
      --no-digest - This option will speed up “$0” run by skipping file digest checks.
                    Changes to the contents of files will not be detected.
      --no-broken - This option will prevent the system from checking for broken packages
                    and it will only install missing and uninstall unneeded ones.

    Checks Performed:
      On systems which use RPM packages, $program_name runs the rpm -V check on all cPanel-managed RPMs.
      rpm -V determines if the files have changed since their installation; configuration and documentation
      files are ignored in this process. The table below shows the changes detected in the output of rpm -V.

      Note: If the output indicates that only Mode or mTime have changed, then that file will not be
      labeled as "changed."

      Check  | Description
        S    | File Size differs.
        M    | Mode differs (includes permissions and file type).
        5    | MD5 sum differs.
        D    | Device major/minor number mismatch.
        L    | readLink(2) path mismatch.
        U    | User ownership differs.
        G    | Group ownership differs.
        T    | mTime differs.

};

    exit $exit_code;
}

1;
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