author | Kim Alvefur <zash@zash.se> |
Sat, 25 Jan 2020 01:31:49 +0100 | |
changeset 3861 | 8752e5b5dd08 |
parent 3231 | 62c82d097017 |
child 4314 | b0ad1604f77e |
permissions | -rw-r--r-- |
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<?php |
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/* |
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PHP script to handle file uploads and downloads for Prosody's mod_http_upload_external |
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Tested with Apache 2.2+ and PHP 5.3+ |
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** Why this script? |
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This script only allows uploads that have been authorized by mod_http_upload_external. It |
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attempts to make the upload/download as safe as possible, considering that there are *many* |
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security concerns involved with allowing arbitrary file upload/download on a web server. |
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With that said, I do not consider myself a PHP developer, and at the time of writing, this |
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code has had no external review. Use it at your own risk. I make no claims that this code |
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is secure. |
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** How to use? |
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Drop this file somewhere it will be served by your web server. Edit the config options below. |
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In Prosody set: |
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http_upload_external_base_url = "https://your.example.com/path/to/share.php/" |
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http_upload_external_secret = "this is your secret string" |
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** License |
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(C) 2016 Matthew Wild <mwild1@gmail.com> |
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software |
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and associated documentation files (the "Software"), to deal in the Software without restriction, |
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including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, |
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subject to the following conditions: |
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The above copyright notice and this permission notice shall be included in all copies or substantial |
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portions of the Software. |
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING |
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BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, |
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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*/ |
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/*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/ |
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/* CONFIGURATION OPTIONS */ |
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/*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/ |
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/* Change this to a directory that is writable by your web server, but is outside your web root */ |
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$CONFIG_STORE_DIR = '/tmp'; |
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/* This must be the same as 'http_upload_external_secret' that you set in Prosody's config file */ |
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$CONFIG_SECRET = 'this is your secret string'; |
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/* For people who need options to tweak that they don't understand... here you are */ |
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$CONFIG_CHUNK_SIZE = 4096; |
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/*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/ |
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/* END OF CONFIGURATION */ |
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/*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/ |
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/* Do not edit below this line unless you know what you are doing (spoiler: nobody does) */ |
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$upload_file_name = substr($_SERVER['PHP_SELF'], strlen($_SERVER['SCRIPT_NAME'])+1); |
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$store_file_name = $CONFIG_STORE_DIR . '/store-' . hash('sha256', $upload_file_name); |
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$request_method = $_SERVER['REQUEST_METHOD']; |
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/* Set CORS headers */ |
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header('Access-Control-Allow-Methods: GET, PUT, OPTIONS'); |
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header('Access-Control-Allow-Headers: Content-Type'); |
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header('Access-Control-Max-Age: 7200'); |
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header('Access-Control-Allow-Origin: *'); |
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if(array_key_exists('v', $_GET) === TRUE && $request_method === 'PUT') { |
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$upload_file_size = $_SERVER['CONTENT_LENGTH']; |
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$upload_token = $_GET['v']; |
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$calculated_token = hash_hmac('sha256', "$upload_file_name $upload_file_size", $CONFIG_SECRET); |
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if(function_exists('hash_equals')) { |
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if(hash_equals($calculated_token, $upload_token) !== TRUE) { |
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error_log("Token mismatch: calculated $calculated_token got $upload_token"); |
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header('HTTP/1.0 403 Forbidden'); |
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exit; |
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} |
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} |
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else { |
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if($upload_token !== $calculated_token) { |
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error_log("Token mismatch: calculated $calculated_token got $upload_token"); |
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header('HTTP/1.0 403 Forbidden'); |
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exit; |
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} |
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} |
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/* Open a file for writing */ |
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$store_file = fopen($store_file_name, 'x'); |
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if($store_file === FALSE) { |
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header('HTTP/1.0 409 Conflict'); |
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exit; |
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} |
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/* PUT data comes in on the stdin stream */ |
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$incoming_data = fopen('php://input', 'r'); |
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/* Read the data a chunk at a time and write to the file */ |
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while ($data = fread($incoming_data, $CONFIG_CHUNK_SIZE)) { |
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fwrite($store_file, $data); |
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} |
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112 |
|
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113 |
/* Close the streams */ |
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fclose($incoming_data); |
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fclose($store_file); |
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116 |
} else if($request_method === 'GET' || $request_method === 'HEAD') { |
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// Send file (using X-Sendfile would be nice here...) |
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if(file_exists($store_file_name)) { |
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header('Content-Disposition: attachment'); |
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header('Content-Type: application/octet-stream'); |
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header('Content-Length: '.filesize($store_file_name)); |
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header("Content-Security-Policy: \"default-src 'none'\""); |
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header("X-Content-Security-Policy: \"default-src 'none'\""); |
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header("X-WebKit-CSP: \"default-src 'none'\""); |
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if($request_method !== 'HEAD') { |
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readfile($store_file_name); |
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127 |
} |
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} else { |
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129 |
header('HTTP/1.0 404 Not Found'); |
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} |
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} else if($request_method === 'OPTIONS') { |
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} else { |
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133 |
header('HTTP/1.0 400 Bad Request'); |
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134 |
} |
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135 |
|
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136 |
exit; |