PHP ssh2_exec() not executing iptables command

Question

I wanna execute iptables command on a remote server and print all the iptables command output using php:

$connection = ssh2_connect($server_ip, $server_port);

//authenticating username and password
if(ssh2_auth_password($connection, $server_user, $server_pwd)){
    $conn_error=0;
}else{
    $conn_error=1;
}

$stream = ssh2_exec($connection, "iptables -L -n --line-number");
stream_set_blocking( $stream, true );
$data = "";
while( $buf = fread($stream,4096) ){
   $data .= $buf."<br>";
}
fclose($stream);

server connection and authentication is absolutely fine. but command output is blank, basically its not executing commands except basic commands.

I'm accessing the server using root user... some basic commands are working fine ... for example ls, pwd etc. — sameer sardar, Sep 11 '18 at 13:06

score 0 · Answer 1 · answered Sep 11 '18 at 14:29

0

try adding sudo to your command as iptables require sudo permissions.

$stream = ssh2_exec($connection, "sudo iptables -L -n --line-number");

answered Sep 11 '18 at 14:29

Amjad Hussain Syed

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accessing server by root user – sameer sardar Sep 12 '18 at 04:52

score 0 · Accepted Answer · answered Sep 11 '18 at 15:23

This is happening because of the call to stream_set_blocking() which changes the behavior of fread(). You can change your code to look something like this:

$data = '';
while (!feof($stream)) {
    $data .= fread($stream, 4096);
}

echo "$data\n";

Or, more simply:

$data = stream_get_contents($stream);
echo "$data\n";

score 0 · Answer 3 · answered Sep 12 '18 at 05:15

I found the issue behind this. we've to allow iptables command for apache.

Run the command sudo visudo. Actually we want to edit the file in etc/sudoers.To do that, by using sudo visudo in terminal ,it duplicate(temp) sudoers file to edit.
At the end of the file, add the following ex:-if we want to use command for restart smokeping and mount command for another action,

www-data ALL=NOPASSWD: /sbin/iptables

https://stackoverflow.com/a/22953232/5979349

PHP ssh2_exec() not executing iptables command

3 Answers3