Validate FTP credentials - php

Question

I am writing a PHP page, which stores FTP Account's address, Username and Password.
I need to validate them against the server and tell user if the credentials provided are working.
It is possible to fire system commands, System commands are preferable so that a reusable script could be written.
So can anybody tell me how do I validate the ftp credentials on bash? I am CentOS.

Answer 1

You can use ftp_connect() and ftp_login() :
<?php
$conn = ftp_connect($ftp_server);
$result = ftp_login($conn, $ftp_user_name, $ftp_user_pass);
if ((!$conn) || (!result)) {
echo "Failed";
} else {
echo "Success";
}
ftp_close($conn);

Answer 2

<?php
function testFtpCredentials($server, $username, $password){
if(!is_string($server) or !strlen($server = trim($server))){
return null;
}
if(!is_string($username) or !strlen($username = trim($username))){
return null;
}
if(!is_string($password) or !strlen($password = trim($password))){
return null;
}
if(!$connection = ftp_connect($server)){
return false;
}
$result = ftp_login($connection, $username, $password);
ftp_close($connection);
return (bool)$result;
}
// How to use it.
var_dump(testFtpCredentials('ftp.server', 'username', 'password'));
?>
A function. Use it! Don't do system calls for such easy task.

Answer 3

You can use this code
try {
$con = ftp_connect($server);
if (false === $con) {
throw new Exception('Unable to connect');
}
$loggedIn = ftp_login($con, $username, $password);
if (true === $loggedIn) {
echo 'Success!';
} else {
throw new Exception('Unable to log in');
}
print_r(ftp_nlist($con, "."));
ftp_close($con);
} catch (Exception $e) {
echo "Failure: " . $e->getMessage();
}

Answer 4

PHP Has an FTP Module you can use to validate the credentials
Basic example from the docs
<?php
// set up basic connection
$conn_id = ftp_connect($ftp_server);
// login with username and password
$login_result = ftp_login($conn_id, $ftp_user_name, $ftp_user_pass);
// check connection
if ((!$conn_id) || (!$login_result)) {
echo "FTP connection has failed!";
echo "Attempted to connect to $ftp_server for user $ftp_user_name";
exit;
} else {
echo "Connected to $ftp_server, for user $ftp_user_name";
}
// upload the file
$upload = ftp_put($conn_id, $destination_file, $source_file, FTP_BINARY);
// check upload status
if (!$upload) {
echo "FTP upload has failed!";
} else {
echo "Uploaded $source_file to $ftp_server as $destination_file";
}
// close the FTP stream
ftp_close($conn_id);
?>
Of course, if you really want to FTP on the command line via exec() or something, there are resources like these docs which will help.
A working example I just tried:
file: ftp.sh
#! /bin/bash
USER=user#domain.com
PASS=xxxxxxxxxxxx
ftp -inv domain.com <<EOF
user $USER $PASS
ls -l
file: index.php
$result = shell_exec('sh ftp.sh');
var_dump($result);