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Full Discussion: Problem with perl openssh
Top Forums Shell Programming and Scripting Problem with perl openssh Post 302466645 by dahlia84 on Wednesday 27th of October 2010 12:48:47 AM
Old 10-27-2010
Can you try something like this? Source: Net::OpenSSH

Quote:
mod_perl and mod_perl2

mod_perl and mod_perl2 tie STDIN and STDOUT to objects that are not backed up by real file descriptors at the operative system level. Net::OpenSSH will fail if any of these handles is used explicetly or implicitly when calling some remote command.
The workaround is to redirect them to /dev/null or to some file:
open my $def_in, '<', '/dev/null' or die "unable to open /dev/null";
my $ssh = Net::OpenSSH->new($host,
default_stdin_fh => $def_in);

my $out = $ssh->capture($cmd1);
$ssh->system({stdout_discard => 1}, $cmd2);
$ssh->system({stdout_to_file => '/tmp/output'}, $cmd3);

Also, note that from a security stand point, running ssh from inside the webserver process is not a great idea. An attacker exploiting some Apache bug would be able to access the ssh keys and passwords and gain unlimited access to the remote systems.
If you can, use a queue (as TheSchwartz) or any other mechanism to execute the ssh commands from another process running under a different user account.
At a minimum, ensure that ~www-data/.ssh (or similar) is not accessible through the web server!
 

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LEARN ABOUT DEBIAN

net::openssh::compat

Net::OpenSSH::Compat(3pm)				User Contributed Perl Documentation				 Net::OpenSSH::Compat(3pm)

NAME

       Net::OpenSSH::Compat - Compatibility modules for Net::OpenSSH

SYNOPSIS

	 use Net::OpenSSH::Compat 'Net::SSH2';
	 use Net::OpenSSH::Compat 'Net::SSH::Perl';

DESCRIPTION

       This package contains a set of adapter modules that run on top of Net::OpenSSH providing the APIs of other SSH modules available from CPAN.

       Currently, there are adapters available for Net::SSH2 and Net::SSH::Perl. Adapters for Net::SSH and Net::SFTP are planned... maybe also for
       Net::SCP and Net::SCP::Expect if somebody request them.

BUGS AND SUPPORT

       This is a work in progress.

       If you find any bug fill a report at the CPAN RT bugtracker (https://rt.cpan.org/Ticket/Create.html?Queue=Net-OpenSSH-Compat
       <https://rt.cpan.org/Ticket/Create.html?Queue=Net-OpenSSH-Compat>) or just send me an e-mail with the details.

   Git repository
       The source code repository is at https://github.com/salva/p5-Net-OpenSSH-Compat <https://github.com/salva/p5-Net-OpenSSH-Compat>.

   My wishlist
       If you like this module and you're feeling generous, take a look at my Amazon Wish List: <http://amzn.com/w/1WU1P6IR5QZ42>

       Also consider contributing to the OpenSSH project this module builds upon: <http://www.openssh.org/donations.html>.

SEE ALSO

       Net::OpenSSH, Net::OpenSSH::Compat::SSH2, Net::OpenSSH::Compat::Perl.

COPYRIGHT AND LICENSE

       Copyright (C) 2011 by Salvador Fandino (sfandino@yahoo.com)

       This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.10.1 or,
       at your option, any later version of Perl 5 you may have available.

perl v5.14.2							    2011-09-28						 Net::OpenSSH::Compat(3pm)
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