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annotate mod_http_upload_external/share.php @ 2977:7036e82f83f5

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mod_http_upload_external: share.php example: Add CSP headers
author Matthew Wild <mwild1@gmail.com>
date Mon, 02 Apr 2018 10:52:32 +0100
parents 67d6510c5f49
children 9480ca61294d
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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 if(array_key_exists('v', $_GET) === TRUE && $request_method === 'PUT') {
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73 $upload_file_size = $_SERVER['HTTP_CONTENT_LENGTH'];
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74 $upload_token = $_GET['v'];
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75
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76 $calculated_token = hash_hmac('sha256', "$upload_file_name $upload_file_size", $CONFIG_SECRET);
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77 if($upload_token !== $calculated_token) {
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78 header('HTTP/1.0 403 Forbidden');
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79 exit;
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80 }
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81
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82 /* Open a file for writing */
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83 $store_file = fopen($store_file_name, 'x');
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84
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85 if($store_file === FALSE) {
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86 header('HTTP/1.0 409 Conflict');
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87 exit;
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88 }
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89
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90 /* PUT data comes in on the stdin stream */
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91 $incoming_data = fopen('php://input', 'r');
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92
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93 /* Read the data a chunk at a time and write to the file */
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94 while ($data = fread($incoming_data, $CONFIG_CHUNK_SIZE)) {
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95 fwrite($store_file, $data);
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96 }
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97
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98 /* Close the streams */
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99 fclose($incoming_data);
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100 fclose($store_file);
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101 } else if($request_method === 'GET' || $request_method === 'HEAD') {
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102 // Send file (using X-Sendfile would be nice here...)
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103 if(file_exists($store_file_name)) {
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104 header('Content-Disposition: attachment');
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105 header('Content-Type: application/octet-stream');
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106 header('Content-Length: '.filesize($store_file_name));
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107 header('Content-Security-Policy: "default-src \'none\'"');
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108 header('X-Content-Security-Policy: "default-src \'none\'"');
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109 header('X-WebKit-CSP: "default-src 'none'"');
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110 if($request_method !== 'HEAD') {
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111 readfile($store_file_name);
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112 }
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113 } else {
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114 header('HTTP/1.0 404 Not Found');
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115 }
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116 } else {
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117 header('HTTP/1.0 400 Bad Request');
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118 }
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119
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120 exit;