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#!/usr/local/cpanel/3rdparty/bin/perl
# cpanel - initacls                                  Copyright 2017 cPanel, Inc.
#                                                           All rights Reserved.
# copyright@cpanel.net                                         http://cpanel.net
# This code is subject to the cPanel license. Unauthorized copying is prohibited

package Cpanel::Script::Initacls;

use strict;
use warnings;

use Cpanel::SafeRun::Simple     ();
use Cpanel::SafeRun::Errors     ();
use Cpanel::BinUtils            ();
use Cpanel::Config::CpConfGuard ();
use Cpanel::Logger              ();
use Cpanel::OSSys               ();
use Cpanel::SafeFile            ();
use Cpanel::TempFile            ();

our @setfacl_locations = qw{/bin/setfacl /usr/bin/setfacl};
our $aclsonfs          = 0;
our $fstab             = "/etc/fstab";
our $fileprotect_touch = '/var/cpanel/fileprotect';
my $logger;

exit main() unless caller();

sub main {

    $logger = Cpanel::Logger->new();

    my ( $system, undef, $release ) = Cpanel::OSSys::uname();

    my $mount_bin = Cpanel::BinUtils::find_mount();
    my $mount     = Cpanel::SafeRun::Simple::saferun($mount_bin);
    chomp($mount);

    if ( $mount =~ /acl/ ) { $aclsonfs = 1; }

    if ( !grep { -x $_ } @setfacl_locations ) {
        acldeath("Unable to locate setfacl: your distribution may not support acls\n");
    }

    $release =~ /^(\d+\.\d+)/;
    my $nversion = $1;

    if ( $system =~ /linux/i && $nversion < 2.6 ) { acldeath("You must be running at least a 2.6 kernel to use this script."); }

    setuplinuxfstab();
    acltestandsetup();
    return 0;

}

sub setuplinuxfstab {

    #Check if the system is XFS (we only support XFS and ext3/4 as of this writing)
    my $is_xfs = Cpanel::SafeRun::Errors::saferunallerrors(qw{mount -l});
    chomp $is_xfs;
    if ( $is_xfs =~ m/on \/ type xfs/i ) {
        print "XFS requires no mount alterations to enable ACLs, skipping...\n";
        return 1;
    }

    if ( !$aclsonfs ) {
        my $acltest = Cpanel::SafeRun::Errors::saferunallerrors( "mount", "-o", "remount,acl", "/" );
        chomp($acltest);
        if ( $acltest ne "" ) {
            acldeath("System error: $acltest when testing for acl support.  Your kernel may not support POSIX acls\n");
        }
    }
    my $modtab = 0;
    my (@FSTAB);
    my (@REMOUNT);

    local $| = 1;
    my $fstablock = Cpanel::SafeFile::safeopen( \*FT, "+<", $fstab );
    if ( !$fstablock ) {
        $logger->die("Could not edit $fstab");
    }
    while (<FT>) {
        chomp();
        if ( !/^[\s\t]*[\#\;]+/ ) {
            my (@FSLINE) = split( /[\s\t]+/, $_ );
            my @OPTS = $FSLINE[3] ? split( /\,/, $FSLINE[3] ) : ();
            if ( ( $FSLINE[2] && $FSLINE[2] =~ /^ext\d+$/ ) && !grep( /^acl$/, @OPTS ) ) {
                push( @OPTS, 'acl' );
                $FSLINE[3] = join( ",", @OPTS );
                push( @FSTAB,   join( "\t", @FSLINE ) );
                push( @REMOUNT, $FSLINE[0] );
                $modtab = 1;
            }
            else {
                push( @FSTAB, $_ );
            }
        }
        else {
            push( @FSTAB, $_ );
        }
    }
    if ($modtab) {
        seek( FT, 0, 0 );
        print FT join( "\n", @FSTAB ) . "\n";
        truncate( FT, tell(FT) );
    }
    foreach (@REMOUNT) {
        my $res = Cpanel::SafeRun::Errors::saferunallerrors( "mount", "-o", "remount", $_ );
        chomp $res;
        acldeath("System error: $res could not remount $_ with ACLs enabled!") if $res;
    }
    return Cpanel::SafeFile::safeclose( \*FT, $fstablock );
}

sub acltestandsetup {
    my $cfiler   = Cpanel::TempFile->new();
    my $randfile = $cfiler->file();
    open( my $ACLTESTFILE, ">", $randfile ) or die("Couldn't open ACL test file $randfile for writing!");
    close($ACLTESTFILE);

    my $acltest  = Cpanel::SafeRun::Errors::saferunallerrors( "setfacl", "-m", "user:nobody:r", "--", $randfile );
    my $acltest2 = Cpanel::SafeRun::Errors::saferunnoerror( "getfacl", $randfile );

    chomp($acltest);
    if ( $acltest ne "" ) {
        acldeath("System error: setfacl: $acltest when testing for acl support.  Your kernel may not support POSIX acls.\n");
    }
    chomp($acltest2);
    if ( $acltest2 !~ /nobody/i ) {
        acldeath("System error: setfacl did not set the permissions that were requested. Your kernel may not support POSIX acls.\n");
    }

    print "ACLS are now on\n";

    return setacls(1);
}

sub acldeath {
    my $err = shift;
    print "ACLS are now off\n";
    setacls(0);
    return die($err);
}

sub setacls {
    my $val          = shift;
    my $cpconf_guard = Cpanel::Config::CpConfGuard->new();
    $cpconf_guard->{'data'}->{'acls'} = $val;
    $cpconf_guard->save();

    print "Updating Permissions.....";
    if ( -e $fileprotect_touch ) {
        Cpanel::SafeRun::Errors::saferunnoerror('/usr/local/cpanel/scripts/enablefileprotect');
    }
    else {
        Cpanel::SafeRun::Errors::saferunnoerror('/usr/local/cpanel/scripts/disablefileprotect');
    }

    print "Done\n";
    return 1;
}

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