<?php
// uncomment these to see what happens in different situations.
// note that this only handles file security; it DOES NOT stop me from reading your files, or vice-versa.
$_GET = ['user' => '__adrian', 'file' => 'foo.txt'];
//$_GET = ['user' => '__adrian', 'file' => 'remote-file-inclusion.exe'];
//$_GET = ['user' => 'UnicornTek', 'file' => 'filesystems-tutorial.pdf'];
//$_GET = ['user' => 'UnicornTek', 'file' => 'bar.txt'];
$allowed_files = [
'__adrian' => [
'foo.txt',
'bar.png'
],
'UnicornTek' => [
'filesystems-turoial.pdf',
'remote-file-inclusion.exe'
]
];
if (! isset($allowed_files[$_GET['user']]) || ! in_array($_GET['file'], $allowed_files[$_GET['user']])) {
throw new Exception("File Not Found: {$_GET['user']}/{$_GET['file']}");
}
readfile("/path/to/users/{$_GET['user']}/{$_GET['file']}");
Warning: readfile(): open_basedir restriction in effect. File(/path/to/users/__adrian/foo.txt) is not within the allowed path(s): (/tmp:/in:/etc) in /in/1bm4p on line 27
Warning: readfile(/path/to/users/__adrian/foo.txt): Failed to open stream: Operation not permitted in /in/1bm4p on line 27
Output for 8.0.13
Warning: readfile(/path/to/users/__adrian/foo.txt): Failed to open stream: No such file or directory in /in/1bm4p on line 27
Output for 7.3.32 - 7.3.33, 7.4.33
Warning: readfile(/path/to/users/__adrian/foo.txt): failed to open stream: No such file or directory in /in/1bm4p on line 27
Warning: readfile(): open_basedir restriction in effect. File(/path/to/users/__adrian/foo.txt) is not within the allowed path(s): (/tmp:/in:/etc) in /in/1bm4p on line 27
Warning: readfile(/path/to/users/__adrian/foo.txt): failed to open stream: Operation not permitted in /in/1bm4p on line 27