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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - scripts/check_security_advice_changes     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_security_advice_changes;

use strict;
use Cpanel::Transaction::File::JSON ();
use Cpanel::Hash                    ();
use Cpanel::Locale                  ();
use Cpanel::Usage                   ();
use Cpanel::Alarm                   ();
use Capture::Tiny                   ();

my $WANT_TYPE = 'mod_advice';
my $CHANNEL   = 'securityadvisor';
our $HISTORY_FILE = '/var/cpanel/security_advisor_history.json';

_run_from_command_line(@ARGV) if !caller();

sub _run_from_command_line {
    my (@args) = @_;
    if ( grep { index( $_, '-background' ) > -1 } @args ) {
        @args = grep { index( $_, '-background' ) == -1 } @args;    # CPANEL-41626: we want to keep elements of @args which DON'T match '-background', so we should check for equality to -1, not non-equality.
        require Cpanel::Daemonizer::Tiny;
        require Cpanel::FileUtils::Open;
        require Cpanel::ConfigFiles;
        my $pid = Cpanel::Daemonizer::Tiny::run_as_daemon(
            sub {
                ####
                # The next two calls are unchecked because it cannot be captured when running as a daemon
                no warnings 'once';
                Cpanel::FileUtils::Open::sysopen_with_real_perms( \*STDERR, $Cpanel::ConfigFiles::CPANEL_ROOT . '/logs/error_log', 'O_WRONLY|O_APPEND|O_CREAT', 0600 );
                open( STDOUT, '>&', \*STDERR ) || warn "Failed to redirect STDOUT to STDERR";

                return _exit( __PACKAGE__->script( \@args ) );
            }
        );
        return _exit(0);
    }
    return _exit( __PACKAGE__->script( \@args ) );
}

sub _exit {
    my ($code) = @_;
    return exit($code);
}

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

    my %opts = (
        notify => 0,
        quiet  => 0,
    );
    my $self = bless {}, $class;
    Cpanel::Usage::wrap_options(
        $argv,
        sub { my (@args) = @_; $self->usage(@args); },
        { 'notify' => \$opts{'notify'}, 'quiet' => \$opts{'quiet'} },
    );
    $self->{'notify'} = $opts{'notify'};
    $self->{'quiet'}  = $opts{'quiet'};

    local $Cpanel::Locale::Context::DEFAULT_OUTPUT_CONTEXT = 'html';

    # Make sure Cpanel::Locale->get_handle() is invoked before being invoked
    # by the security advisor modules; otherwise Net::SMTP will throw warnings.
    $self->_locale();

    # The yum calls can take a while if yum is in use so we now
    # wait up to 30m.  Since v78+ does the security advisor
    # checks in the background this should be ok now.
    my $main_alarm = Cpanel::Alarm->new( 1800, sub { die "$0 timed out because it was running for longer than 30 minutes."; } );    #max 30m

    my $trans_obj = Cpanel::Transaction::File::JSON->new( 'path' => $HISTORY_FILE );

    my $previous_run      = $trans_obj->get_data();
    my %prev_hashes       = ( ref $previous_run eq 'HASH' and $previous_run->{'hashes'} )       ? %{ $previous_run->{'hashes'} }       : ();
    my %prev_message_keys = ( ref $previous_run eq 'HASH' and $previous_run->{'message_keys'} ) ? %{ $previous_run->{'message_keys'} } : ();
    my ( %hashes, %message_keys );

    require Cpanel::Security::Advisor;
    require Cpanel::Security::AdvisorFetch;
    my $msgs = Cpanel::Security::AdvisorFetch::fetch_security_advice();

    my $highest_notice_type = 0;
    my %notices;

    foreach my $data ( @{$msgs} ) {
        my $block = ( $data->{'advice'}{'block_notify'} ) ? $data->{'advice'}{'block_notify'} : 0;
        if ( $data->{'type'} eq $WANT_TYPE && !$block ) {
            my $module      = $data->{'module'};
            my $text        = $data->{'advice'}{'text'} . ( $data->{'advice'}{'suggestion'} ? " " . $data->{'advice'}{'suggestion'} : '' );
            my $hash        = Cpanel::Hash::get_fastest_hash($text);
            my $message_key = ( $data->{'advice'}{'key'} ) ? $data->{'advice'}{'key'} : $data->{'module'};

            # NOTE: Condition description:
            # NOTE: True If advice type is INFO/WARN/BAD && (advice not seen before (via static key or hash) or advise type is greater [i.e., worse] then seen type)
            my $good = Cpanel::Security::Advisor::_lookup_advise_type_by_value(q{ADVISE_GOOD});
            if ( $data->{'advice'}{'type'} > $good && ( !( $prev_hashes{$hash} || $prev_message_keys{$message_key} ) || $prev_hashes{$hash} < $data->{'advice'}{'type'} ) ) {
                push @{ $notices{$module} }, $data->{'advice'};
                if ( $highest_notice_type < $data->{'advice'}{'type'} ) {
                    $highest_notice_type = $data->{'advice'}{'type'};
                }
            }

            # maintain the augmented datastructure
            $hashes{$hash} = $data->{'advice'}{'type'};

            # message key hash will store advise type as string
            $message_keys{$message_key}{$hash} = Cpanel::Security::Advisor::_lookup_advise_type( $data->{'advice'}{'type'} );
        }
    }
    $trans_obj->set_data( { 'hashes' => \%hashes, 'message_keys' => \%message_keys } );
    my ( $status, $statusmsg ) = $trans_obj->save_and_close();

    # Need to notify
    {
        no warnings 'once';
        if (
            $highest_notice_type
            &&

            # case CPANEL-6053: Only generate an iContact notification if there
            # are changes to WARN or higher.
            $highest_notice_type >= $Cpanel::Security::Advisor::ADVISE_WARN
        ) {
            $self->notify( $highest_notice_type, \%notices );
        }
        else {
            print $self->_locale()->maketext("There are no changes to the Security Advisor state that require notification.") . "\n";
        }
    }
    return 0;
}

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

    print $self->_locale()->maketext(q{This tool monitors the state of the Security Advisor and can send a notification when the state changes.}), "\n\n";
    print $self->_locale()->maketext( q{Usage: [_1][comment,a program name] ~[options~]}, $0 ),                                                    "\n\n";
    print $self->_locale()->maketext(q{Options:}),                                                                                                 "\n";
    print "\t--help     ",                                                                                                                         $self->_locale()->maketext(q{Display this help message.}),                                               "\n";
    print "\t--notify   ",                                                                                                                         $self->_locale()->maketext(q{Send a notification to the system administrator.}),                         "\n";
    print "\t--quiet    ",                                                                                                                         $self->_locale()->maketext(q{Do not display output, and instead set the [output,asis,UNIX] exit code.}), "\n\n";

    exit 0;
}

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

    require Cpanel::Locale;
    my $old = $self->_locale()->set_context_plain();

    require Cpanel::Notify;
    my $ic_obj = Cpanel::Notify::notification_class(
        'class'            => 'Check::SecurityAdvisorStateChange',
        'application'      => 'Check::SecurityAdvisorStateChange',
        'status'           => 'changes',
        'interval'         => 1,
        'constructor_args' => [
            'origin'              => 'check_for_security_advise_changes',
            'notices'             => $notices,
            'highest_notice_type' => $highest_notice_type,
            'skip_send'           => 1,
        ]
    );

    unless ( $self->{'quiet'} ) {
        print $ic_obj->render_template_include_as_text( 'template' => 'subject', 'type' => 'text' ) . "\n\n" . $ic_obj->render_template_include_as_text( 'template' => 'body', 'type' => 'html' );
    }

    if ( $self->{'notify'} ) {
        $ic_obj->send();
    }
    $self->_locale()->set_context($old);

    return 1;
}

sub _locale {
    my ($self) = @_;
    require Cpanel::Locale;
    return ( $self->{'_locale'} ||= Cpanel::Locale->get_handle() );
}

1;