CODEWITHSUNDEEP
phpftpsftpphpseclib
Chopnut
Chopnut

Reputation: 647

phpseclib connection closed by server?

I have a pretty simple PHP script that tries to connect to SFTP server from a CENTOS 7 box. Using phpseclib via composer.

<?php
require('vendor/autoload.php');
$usr = 'xx';
$pwd = 'xx';
$host = 'sftp.domain.com.au';

$sftp = new SFTP($host);

if($sftp->login($usr, $pwd)){
   echo "Connected.";
}else {
   echo "Failed";
}
?>

And even used an RSA key

<?php
require('vendor/autoload.php');
$usr = 'xx';
$pwd = 'xx';
$host = 'sftp.domain.com.au';

$sftp = new SFTP($host);
$rsa  = new RSA();
$rsa->loadKey(file_get_contents("../../.ssh/id_rsa"));
if($sftp->login($usr, $pwd, $rsa)){
   echo "Connected.";
}else {
   echo "Failed";
}
?>

The script above with RSA actually did work a few times and got me connected. So I thought I need to understand why it works, and change a few things. I tried generating another key overwriting the existing key. But this time it didnt work anymore.

I also turned on the NET_SFTP_LOGGING with no display error just a plain "Connection closed by server". I have been working on this for days..

Only thing I could think of is when I regenerated the key and overwrite the ID_RSA somehow maybe the server thinks its not the right key anymore?

Also when I connect using WinSCP, it seems the FTP server is giving me an algorithm: ssh-rsa 4096 , sha256 and md5 code. Is this something I need to use in my PHP script to properly connect? Just trying to rule out any possibilities.

MORE DETAILS:

Please anyone give us some advise as this is consuming me for DAYS hopefully not for weeks! Thanks in advance.

Upvotes: 0

Views: 2100

Answers (1)

neubert
neubert

Reputation: 16792

From your code:

$rsa->loadKey("../../.ssh/id_rsa");

Try this:

$rsa->loadKey(file_get_contents("../../.ssh/id_rsa"));

Also,

if($sftp->login($usr, $pwd, $rsa)){

Are you actually wanting to use multi-factor auth? In my experience SSH servers setup to do that are quite rare. What seems more likely is that you have a password protected RSA private key, at which point you'd do something more like this:

$rsa->setPassword($pwd);
$rsa->loadKey(file_get_contents("../../.ssh/id_rsa"));

Upvotes: 1

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