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Full Discussion: Timed action after fork() in parent process
Top Forums Programming Timed action after fork() in parent process Post 302510847 by disaster on Tuesday 5th of April 2011 06:45:47 AM
Old 04-05-2011
Well, looks like I learned more than I intended to... didn't know that this was possible for binaries either... Anyways: If you take away the read flag, this way won't work anymore:
Code:
[chris@myhost Test]$ ./hw
Hallo welt
[chris@myhost Test]$ ls -l hw
-rwxr-xr-x 1 chris users 5432 Apr  1 14:44 hw
[chris@myhost Test]$ chmod -x hw
[chris@myhost Test]$ ./hw
bash: ./hw: Permission denied
[chris@myhost Test]$ /lib/ld-linux.so.2 ./hw
Hallo welt
[chris@myhost Test]$ chmod -r hw
[chris@myhost Test]$ /lib/ld-linux.so.2 ./hw
./hw: error while loading shared libraries: ./hw: cannot open shared object file: Permission denied
[chris@myhost Test]$ chmod +x hw
[chris@myhost Test]$ ./hw
Hallo welt
[chris@myhost Test]$ /lib/ld-linux.so.2 ./hw
./hw: error while loading shared libraries: ./hw: cannot open shared object file: Permission denied


My intention is to make one program available only over one call within another program. So I would take away its read and exec permissions, so it cannot be executed from anywhere else (assume chmod isn't available to the user). Just with my call as above. The program is obvious: If I wait in the parent process until the child exits there is a time gap in which the permissions are not so strict as I actually want them to be...
 

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LEARN ABOUT OSX

net::ldaps

Net::LDAPS(3)						User Contributed Perl Documentation					     Net::LDAPS(3)

NAME

       Net::LDAPS - use LDAP over an SSL connection

SYNOPSIS

	use Net::LDAPS;

	$ldaps = Net::LDAPS->new('myhost.example.com',
				 port => '10000',
				 verify => 'require',
				 capath => '/usr/local/cacerts/');

	# alternate way
	use Net::LDAP;

	$ldaps = Net::LDAP->new('ldaps://myhost.example.com:10000',
				verify => 'require',
				capath => '/usr/local/cacerts/');

DESCRIPTION

       Communicate using the LDAP protocol to a directory server using an encrypted (SSL) network connection. This mechanism is non-standard but
       widely supported; consider using LDAPv3 with the standard TLS extension if possible (many servers do not support it yet.) See "start_tls"
       in Net::LDAP.

       All the normal "Net::LDAP" methods can be used with a "Net::LDAPS" object; see Net::LDAP for details.

CONSTRUCTOR

       new ( HOST [, OPTIONS ] )
	   Create a new connection. HOST is the hostname to contact. OPTIONS is a number of key/value pairs. See "new" in Net::LDAP for details.

SEE ALSO

       Net::LDAP, IO::Socket::SSL

BUGS

       You cannot have more than one LDAPS connection at any one time, due to restrictions in the underlying Net::SSLeay code.

AUTHOR

       Chris Ridd <chris.ridd@isode.com>

COPYRIGHT

       Copyright (c) 2000-2004, Chris Ridd and Graham Barr. All rights reserved. This library is free software; you can redistribute it and/or
       modify it under the same terms as Perl itself.

perl v5.16.2							    2012-09-20							     Net::LDAPS(3)
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