2

我正在使用 Perl 脚本从 mqueue 文件夹中删除用于 sendmail 的数据。

当我setuid到那个 Perl 脚本并尝试从用户运行它时，它会抛出以下消息：

Insecure dependency in chdir while running setuid at /file/find

如何解决它并以 root 权限成功运行脚本？

!/usr/bin/perl

use strict;

my $qtool = "/usr/local/bin/qtool.pl";
my $mqueue_directory = "/var/spool/mqueue";
my $messages_removed = 0;

use File::Find;
# Recursively find all files and directories in $mqueue_directory
find(\&wanted, $mqueue_directory);

sub wanted {
   # Is this a qf* file?
   if ( /^qf(\w{14})/ ) {
      my $qf_file = $_;
      my $queue_id = $1;
      my $deferred = 0;
      my $from_postmaster = 0;
      my $delivery_failure = 0;
      my $double_bounce = 0;
      open (QF_FILE, $_);
      while(<QF_FILE>) {
         $deferred = 1 if ( /^MDeferred/ );
         $from_postmaster = 1 if ( /^S<>$/ );
         $delivery_failure = 1 if \
            ( /^H\?\?Subject: DELIVERY FAILURE: (User|Recipient)/ );
         if ( $deferred && $from_postmaster && $delivery_failure ) {
            $double_bounce = 1;
            last;
         }
      }
      close (QF_FILE);
      if ($double_bounce) {
         print "Removing $queue_id...\n";
         system "$qtool", "-d", $qf_file;
         $messages_removed++;
      }
   }
}

print "\n$messages_removed total \"double bounce\" message(s) removed from ";
print "mail queue.\n";
4

2 回答 2

4

“不安全的依赖”是Taint一回事： http: //perldoc.perl.org/perlsec.html。

由于您已运行脚本 setuid，因此正在强制执行污点。您需要指定 untaintFile::Find 的 %option 键：

http://metacpan.org/pod/File::查找

my %options = (
    wanted => \&wanted,
    untaint => 1
);

find(\%options, $mqueue_directory);

您还应该查看untaint_patternPOD 中的 File::Find。

于 2012-05-10T09:35:20.130 回答
-3

您应该构建一个程序包装器。在几乎任何 unix 系统上，脚本永远无法通过 SetUID 位获得 root 权限。你可以在这里找到一些有用的例子http://www.tuxation.com/setuid-on-shell-scripts.html

于 2012-05-10T11:33:11.060 回答