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mod_http_upload_external: Improve implementation docs, including v2 details
author Matthew Wild <mwild1@gmail.com>
date Sun, 21 Oct 2018 14:54:19 +0100
parents 57332ea0c1c7
children 3d01ab6b1186
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1 ---
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2 description: HTTP File Upload (external service)
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3 labels: 'Stage-Alpha'
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4 ---
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5
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6 Introduction
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7 ============
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8
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9 This module implements [XEP-0363], which lets clients upload files
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10 over HTTP to an external web server.
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11
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12 This module generates URLs that are signed using a HMAC. Any web service that can authenticate
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13 these URLs can be used.
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14
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15 Implementations
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16 ---------------
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17
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18 * [PHP implementation](https://hg.prosody.im/prosody-modules/raw-file/tip/mod_http_upload_external/share.php)
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19 * [Python3+Flask implementation](https://github.com/horazont/xmpp-http-upload)
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20 * [Go implementation, Prosody Filer](https://github.com/ThomasLeister/prosody-filer)
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21 * [Perl implementation for nginx](https://github.com/weiss/ngx_http_upload)
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23 To implement your own service compatible with this module, check out the implementation notes below
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24 (and if you publish your implementation - let us know!).
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26 Configuration
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27 =============
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28
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29 Add `"http_upload_external"` to modules_enabled in your global section, or under the host(s) you wish
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30 to use it on.
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31
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32 External URL
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33 ------------
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35 You need to provide the path to the external service. Ensure it ends with '/'.
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36
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37 For example, to use the PHP implementation linked above, you might set it to:
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38
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39 ``` {.lua}
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40 http_upload_external_base_url = "https://your.example.com/path/to/share.php/"
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41 ```
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42
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43 Secret
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44 ------
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45
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46 Set a long and unpredictable string as your secret. This is so the upload service can verify that
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47 the upload comes from mod_http_upload_external, and random strangers can't upload to your server.
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48
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49 ``` {.lua}
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50 http_upload_external_secret = "this is a secret string!"
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51 ```
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52
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53 You need to set exactly the same secret string in your external service.
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54
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55 Limits
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56 ------
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57
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58 A maximum file size can be set by:
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59
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60 ``` {.lua}
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61 http_upload_external_file_size_limit = 123 -- bytes
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62 ```
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63
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64 Default is 100MB (100\*1024\*1024).
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65
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66 Compatibility
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67 =============
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68
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69 Works with Prosody 0.9.x and later.
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70
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71 Implementation
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72 ==============
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73
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74 To implement your own external service that is compatible with this module, you need to expose a
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75 simple API that allows the HTTP GET, HEAD and PUT methods on arbitrary URLs located on your service.
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76
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77 For example, if http_upload_external_base_url is set to `https://example.com/upload/` then your service
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78 might receive the following requests:
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79
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80 Upload a new file:
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81
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82 ```
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83 PUT https://example.com/upload/foo/bar.jpg?v=49e9309ff543ace93d25be90635ba8e9965c4f23fc885b2d86c947a5d59e55b2
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84 ```
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85
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86 Recipient checks the file size and other headers:
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87
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88 ```
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89 HEAD https://example.com/upload/foo/bar.jpg
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90 ```
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91
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92 Recipient downloads the file:
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93
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94 ```
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95 GET https://example.com/upload/foo/bar.jpg
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96 ```
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97
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98 The only tricky logic is in validation of the PUT request. Firstly, don't overwrite existing files (return 409 Conflict).
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99
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100 Then you need to validate the auth token.
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101
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102 ### Validating the auth token
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103
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104
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105 | Version | Supports |
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106 |:--------|:--------------------------------------------------------------------------------------------------------|
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107 | v | Validates only filename and size. Does not support file type restrictions by the XMPP server. |
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108 | v2 | Validates the filename, size and MIME type. This allows the server to implement MIME type restrictions. |
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109
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110 It is probable that a future v3 will be specified that allows carrying information about the uploader identity, allowing
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111 the implementation of per-user quotas and limits.
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112
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113 Implementations may implement one or more versions of the protocol simultaneously. The XMPP server generates the URLs and ultimately selects which version will be used.
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114
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115 #### Version 1 (v)
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116
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117 The token will be in the URL query parameter 'v'. If it is absent, fail with 403 Forbidden.
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118
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119 Calculate the expected auth token by reading the value of the Content-Length header of the PUT request. E.g. for a 1MB file
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120 will have a Content-Length of '1048576'. Append this to the uploaded file name, separated by a space (0x20) character.
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121
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122 For the above example, you would end up with the following string: "foo/bar.jpg 1048576"
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123
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124 The auth token is a SHA256 HMAC of this string, using the configured secret as the key. E.g.
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125
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126 ```
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127 calculated_auth_token = hmac_sha256("foo/bar.jpg 1048576", "secret string")
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128 ```
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129
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130 If this is not equal to the 'v' parameter provided in the upload URL, reject the upload with 403 Forbidden.
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131
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132 **Security note:** When comparing `calculated_auth_token` with the token provided in the URL, you must use a constant-time string
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133 comparison, otherwise an attacker may be able to discover your secret key. Most languages/environments provide such a function, such
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134 as `hash_equals()` in PHP, `hmac.compare_digest()` in Python, or `ConstantTimeCompare()` from `crypto/subtle` in Go.
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135
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136 #### Version 2 (v2)
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137
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138 The token will be in the URL query parameter 'v2'. If it is absent, fail with 403 Forbidden.
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139
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140 | Input | Example |Read from |
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141 |:--------------|:------------|:--------------------------------------------------------------------|
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142 |`file_path` | foo/bar.jpg | The URL of the PUT request, with the service's base prefix removed. |
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143 |`content_size` | 1048576 | Content-Size header |
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144 |`content_type` | image/jpeg | Content-Type header |
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145
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146 The parameters should be joined into a single string, separated by NUL bytes (`\0`):
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147
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148 ```
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149 signed_string = ( file_path + '\0' + content_size + '\0' + content_type )
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150 ```
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151
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152 ```
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153 signed_string = "foo/bar.jpg\01048576\0image/jpeg"
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154 ```
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155
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156 The expected auth token is the SHA256 HMAC of this string, using the configured secret key as the key. E.g.:
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157
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158 ```
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159 calculated_auth_token = hmac_sha256(signed_string, "secret string")
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160 ```
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161
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162 If this is not equal to the 'v2' parameter provided in the upload URL, reject the upload with 403 Forbidden.
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163
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164 **Security note:** When comparing `calculated_auth_token` with the token provided in the URL, you must use a constant-time string
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165 comparison, otherwise an attacker may be able to discover your secret key. Most languages/environments provide such a function, such
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166 as `hash_equals()` in PHP, `hmac.compare_digest()` in Python, or `ConstantTimeCompare()` from `crypto/subtle` in Go.
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167
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168 ### Security considerations
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169
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170 #### HTTPS
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171
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172 All uploads and downloads should only be over HTTPS. The security of the served content is protected only
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173 by the uniqueness present in the URLs themselves, and not using HTTPS may leak the URLs and contents to third-parties.
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174
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175 Implementations should consider including HSTS and HPKP headers, with consent of the administrator.
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176
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177 #### MIME types
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178
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179 If the upload Content-Type header matches any of the following MIME types, it MUST be preserved and included in the Content-Type
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180 of any GET requests made to download the file:
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181
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182 - `image/*`
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183 - `video/*`
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184 - `audio/*`
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185 - `text/plain`
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186
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187 It is recommended that other MIME types are preserved, but served with the addition of the following header:
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188
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189 ```
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190 Content-Disposition: attachment
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191 ```
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192
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193 This prevents the browser interpreting scripts and other resources that may potentially be malicious.
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194
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195 Some browsers may also benefit from explicitly telling them not to try guessing the type of a file:
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196
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197 ```
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198 X-Content-Type-Options "nosniff"
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199 ```
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200
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201 #### Security headers
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202
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203 The following headers should be included to provide additional sandboxing of resources, considering the uploaded
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204 content is not understood or trusted by the upload service:
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205
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206 ```
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207 Content-Security-Policy: "default-src 'none'"
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208 X-Content-Security-Policy: "default-src 'none'"
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209 X-WebKit-CSP: "default-src 'none'"
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210 ```