prosody-modules
c7a5caad28ef
mod_http_upload_external/share.php

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mod_http_upload_external/share.php @ 5405:c7a5caad28ef

mod_http_oauth2: Enforce response type encoded in client_id The client promises to only use this response type, so we should hold them to that. This makes it fail earlier if the response type is disabled or the client is trying to use one that it promised not to use. Better than failing after login and consent.
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 16:31:25 +0200
parent 4310:b0ad1604f77e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 <?php
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2
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3 /*
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4 PHP script to handle file uploads and downloads for Prosody's mod_http_upload_external
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5
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6 Tested with Apache 2.2+ and PHP 5.3+
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7
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8 ** Why this script?
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9
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10 This script only allows uploads that have been authorized by mod_http_upload_external. It
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11 attempts to make the upload/download as safe as possible, considering that there are *many*
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12 security concerns involved with allowing arbitrary file upload/download on a web server.
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13
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14 With that said, I do not consider myself a PHP developer, and at the time of writing, this
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15 code has had no external review. Use it at your own risk. I make no claims that this code
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16 is secure.
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17
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18 ** How to use?
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19
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20 Drop this file somewhere it will be served by your web server. Edit the config options below.
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21
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22 In Prosody set:
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23
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24 http_upload_external_base_url = "https://your.example.com/path/to/share.php/"
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25 http_upload_external_secret = "this is your secret string"
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26
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27 ** License
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28
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29 (C) 2016 Matthew Wild <mwild1@gmail.com>
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30
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31 Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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32 and associated documentation files (the "Software"), to deal in the Software without restriction,
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33 including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
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34 and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
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35 subject to the following conditions:
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36
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37 The above copyright notice and this permission notice shall be included in all copies or substantial
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38 portions of the Software.
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39
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40 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
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41 BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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42 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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43 DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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44 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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45
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46 */
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47
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48 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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49 /* CONFIGURATION OPTIONS */
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50 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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51
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52 /* Change this to a directory that is writable by your web server, but is outside your web root */
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53 $CONFIG_STORE_DIR = '/tmp';
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54
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55 /* This must be the same as 'http_upload_external_secret' that you set in Prosody's config file */
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56 $CONFIG_SECRET = 'this is your secret string';
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57
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58 /* For people who need options to tweak that they don't understand... here you are */
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59 $CONFIG_CHUNK_SIZE = 4096;
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60
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61 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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62 /* END OF CONFIGURATION */
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63 /*\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\*/
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64
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65 /* Do not edit below this line unless you know what you are doing (spoiler: nobody does) */
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66
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67 $upload_file_name = substr($_SERVER['PHP_SELF'], strlen($_SERVER['SCRIPT_NAME'])+1);
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68 $store_file_name = $CONFIG_STORE_DIR . '/store-' . hash('sha256', $upload_file_name);
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69
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70 $request_method = $_SERVER['REQUEST_METHOD'];
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71
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72 /* Set CORS headers */
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73 header('Access-Control-Allow-Methods: GET, PUT, OPTIONS');
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74 header('Access-Control-Allow-Headers: Content-Type');
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75 header('Access-Control-Max-Age: 7200');
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76 header('Access-Control-Allow-Origin: *');
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77
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78 if(array_key_exists('v', $_GET) === TRUE && $request_method === 'PUT') {
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79 $upload_file_size = $_SERVER['CONTENT_LENGTH'];
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80 $upload_token = $_GET['v'];
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81
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82 $calculated_token = hash_hmac('sha256', "$upload_file_name $upload_file_size", $CONFIG_SECRET);
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83 if(function_exists('hash_equals')) {
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84 if(hash_equals($calculated_token, $upload_token) !== TRUE) {
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85 error_log("Token mismatch: calculated $calculated_token got $upload_token");
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86 header('HTTP/1.0 403 Forbidden');
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87 exit;
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88 }
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89 }
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90 else {
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91 if($upload_token !== $calculated_token) {
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92 error_log("Token mismatch: calculated $calculated_token got $upload_token");
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93 header('HTTP/1.0 403 Forbidden');
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94 exit;
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95 }
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96 }
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97 /* Open a file for writing */
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98 $store_file = fopen($store_file_name, 'x');
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99
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100 if($store_file === FALSE) {
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101 header('HTTP/1.0 409 Conflict');
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102 exit;
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103 }
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104
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105 /* PUT data comes in on the stdin stream */
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106 $incoming_data = fopen('php://input', 'r');
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107
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108 /* Read the data a chunk at a time and write to the file */
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109 while ($data = fread($incoming_data, $CONFIG_CHUNK_SIZE)) {
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110 fwrite($store_file, $data);
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111 }
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112
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113 /* Close the streams */
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114 fclose($incoming_data);
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115 fclose($store_file);
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116
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117 // https://xmpp.org/extensions/xep-0363.html#upload
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118 // A HTTP status Code of 201 means that the server is now ready to serve the file via the provided GET URL.
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119 header('HTTP/1.0 201 Created');
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120 exit;
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121 } else if($request_method === 'GET' || $request_method === 'HEAD') {
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122 // Send file (using X-Sendfile would be nice here...)
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123 if(file_exists($store_file_name)) {
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124 header('Content-Disposition: attachment');
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125 header('Content-Type: application/octet-stream');
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126 header('Content-Length: '.filesize($store_file_name));
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127 header("Content-Security-Policy: \"default-src 'none'\"");
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128 header("X-Content-Security-Policy: \"default-src 'none'\"");
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129 header("X-WebKit-CSP: \"default-src 'none'\"");
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130 if($request_method !== 'HEAD') {
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131 readfile($store_file_name);
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132 }
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133 } else {
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134 header('HTTP/1.0 404 Not Found');
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135 }
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136 } else if($request_method === 'OPTIONS') {
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137 } else {
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138 header('HTTP/1.0 400 Bad Request');
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139 }
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140
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141 exit;