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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 SUNOS

sftp-server

sftp-server(1M) 					  System Administration Commands					   sftp-server(1M)

NAME

       sftp-server - SFTP server subsystem

SYNOPSIS

       /usr/lib/ssh/sftp-server

DESCRIPTION

       sftp-server implements the server side of the SSH File Transfer Protocol as defined in the IETF draft-ietf-secsh-filexfer.

       sftp-server is a subsystem for sshd(1M) and must not be run directly. There are no options or config settings.

       To enable the sftp-server subsystem for sshd add the following to /etc/ssh/sshd_config:

       Subsystem   sftp     /usr/lib/ssh/sftp-server

       See sshd_config(4) for a description of the format and contents of that file.

       There is no relationship between the protocol used by sftp-server and the FTP protocol (RFC 959) provided by in.ftpd.

EXIT STATUS

       The following exit values are returned:

       0	Successful completion.

       >0	An error occurred.

FILES

       /usr/lib/sftp-server

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWsshdu 		   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       sftp(1), ssh(1), ssh-add(1), ssh-keygen(1), sshd(1M), sshd_config(4), attributes(5)

       To  view  license  terms,  attribution,	and  copyright	for OpenSSH, the default path is /var/sadm/pkg/SUNWsshdr/install/copyright. If the
       Solaris operating environment has been installed anywhere other than the default, modify the given path to access the file at the installed
       location.

AUTHOR

       Markus Friedl

SunOS 5.10							    30 Jul 2003 						   sftp-server(1M)
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