问题
I have a Perl script which is owned by root and have setuid.
In this script I am changing the owner of a file passed as argument.
But on running this script I am getting
chown: changing ownership of `file': Operation not permitted
Someone told me script with setuid run with suidperl by default if it is enable.
But I don't think so that is happening in my case.
Can anyone help me in this matter? I am using Debian wheezy. My Perl version is 5.14.2. I tried
apt-get install perl-suid
but it did not work.
apt-cache search perl
gave me no candidate related to suid in Perl.
This is my Perl program
#! /usr/bin/perl -T
use Cwd 'abs_path';
sub check_path {
my $file = $_[0];
$file = abs_path($file);
if ($file =~ /^\/home\/abc\/dir1\//) {
return 1;
}
else {
return 0;
print("You can only update permissions for files inside /home/abc/dir1/ directory\n");
}
}
if (@ARGV == 1) {
if (&check_path($ARGV[0]) == 1) {
$ENV{PATH} = "/bin:/usr/bin";
my $command = "chown abc:abc " . $ARGV[0];
if ($command =~ /^(.*)$/) {
$command = $1;
}
$result = `$command`;
}
}
elsif ((@ARGV == 2) && ($ARGV[0] eq "-R")) {
if (&check_path($ARGV[1]) == 1) {
$ENV{PATH} = "/bin:/usr/bin";
my $command = "chown -R abc:abc " . $ARGV[1];
if ($command =~ /^(.*)$/) {
$command = $1;
}
$result = `$command`;
}
}
else {
print("Sorry wrong syntax. Syntax: perl /home/abc/sbin/update_permission.pl [-R] file_path");
}
回答1:
It's probably too late for you, but I had the same problem and used the following simple C wrapper (shamelessly taken from http://www.blyberg.net/downloads/suid-wrapper.c):
#include <unistd.h>
#include <errno.h>
main( int argc, char ** argv, char ** envp )
{
if( setgid(getegid()) ) perror( "setgid" );
if( setuid(geteuid()) ) perror( "setuid" );
envp = 0; /* blocks IFS attack on non-bash shells */
system( "/path/to/bash/script", argv, envp );
perror( argv[0] );
return errno;
}
Replace the path in the C code with the path to your script, compile with
gcc -o suid-wrapper suid-wrapper.c
and set the permissions with
chmod 6755 suid-wrapper
suidperl ist no longer an option, it has been removed without replacement in perl 5.12 (see perl5120delta, i.e. http://search.cpan.org/~shay/perl-5.20.2/pod/perl5120delta.pod).
来源:https://stackoverflow.com/questions/21663217/how-to-enable-suidperl-in-debian-wheezy