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mod_http_oauth2: Mention Device flow in list of flows in README
author Kim Alvefur <zash@zash.se>
date Fri, 21 Jul 2023 00:29:24 +0200
parents 7040d0772758
children 7565298aa197
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1 ---
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2 labels:
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3 - Stage-Alpha
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4 rockspec:
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5 build:
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6 copy_directories:
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7 - html
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8 summary: OAuth 2.0 Authorization Server API
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9 ---
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11 ## Introduction
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12
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13 This module implements an [OAuth2](https://oauth.net/2/)/[OpenID Connect
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14 (OIDC)](https://openid.net/connect/) provider HTTP frontend on top of
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15 Prosody's usual internal authentication backend.
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16
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17 OAuth and OIDC are web standards that allow you to provide clients and
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18 third-party applications limited access to your account, without sharing your
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19 password with them.
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20
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21 With this module deployed, software that supports OAuth can obtain
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22 "access tokens" from Prosody which can then be used to connect to XMPP
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23 accounts using the [OAUTHBEARER SASL mechanism][rfc7628] or via non-XMPP
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24 interfaces such as [mod_rest].
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25
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26 Although this module has been around for some time, it has recently been
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27 significantly extended and largely rewritten to support OAuth/OIDC more fully.
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29 As of April 2023, it should be considered **alpha** stage. It works, we have
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30 tested it, but it has not yet seen wider review, testing and deployment. At
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31 this stage we recommend it for experimental and test deployments only. For
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32 specific information, see the [deployment notes section](#deployment-notes)
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33 below.
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34
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35 Known client implementations:
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36
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37 - [example shell script for mod_rest](https://hg.prosody.im/prosody-modules/file/tip/mod_rest/example/rest.sh)
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38 - *(we need you!)*
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39
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40 Support for [OAUTHBEARER][rfc7628] has been added to the Lua XMPP
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41 library, [verse](https://code.matthewwild.co.uk/verse). If you know of
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42 additional implementations, or are motivated to work on one, please let
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43 us know! We'd be happy to help (e.g. by providing a test server).
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44
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45 ## Standards support
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46
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47 Notable supported standards:
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48
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49 - [RFC 6749: The OAuth 2.0 Authorization Framework](https://www.rfc-editor.org/rfc/rfc6749)
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50 - [RFC 7009: OAuth 2.0 Token Revocation](https://www.rfc-editor.org/rfc/rfc7009)
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51 - [RFC 7591: OAuth 2.0 Dynamic Client Registration](https://www.rfc-editor.org/rfc/rfc7591.html)
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52 - [RFC 7628: A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth](https://www.rfc-editor.org/rfc/rfc7628)
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53 - [RFC 7636: Proof Key for Code Exchange by OAuth Public Clients](https://www.rfc-editor.org/rfc/rfc7636)
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54 - [RFC 8628: OAuth 2.0 Device Authorization Grant](https://www.rfc-editor.org/rfc/rfc8628)
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55 - [RFC 9207: OAuth 2.0 Authorization Server Issuer Identification](https://www.rfc-editor.org/rfc/rfc9207.html)
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56 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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57 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html) (_partial, e.g. missing JWKS_)
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58 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html)
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59
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60 ## Configuration
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61
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62 ### Interface
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63
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64 The module presents a web page to users to allow them to authenticate when
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65 a client requests access. Built-in pages are provided, but you may also theme
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66 or entirely override them.
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67
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68 This module honours the `site_name` configuration option that is also used by
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69 a number of other modules:
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70
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71 ```lua
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72 site_name = "My XMPP Server"
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73 ```
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74
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75 To provide custom templates, specify the path to the template directory:
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76
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77 ```lua
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78 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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79 ```
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80
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81 Some templates support additional variables, that can be provided by the
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82 `oauth2_template_style` option:
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83
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84 ```lua
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85 oauth2_template_style = {
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86 background_colour = "#ffffff";
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87 }
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88 ```
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89
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90 If you know what features your templates use use you can adjust the
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91 `Content-Security-Policy` header to only allow what is needed:
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92
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93 ```lua
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94 oauth2_security_policy = "default-src 'self'" -- this is the default
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95 ```
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96
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97 ### Token parameters
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98
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99 The following options configure the lifetime of tokens issued by the module.
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100 The defaults are recommended.
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101
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102 ```lua
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103 oauth2_access_token_ttl = 86400 -- 24 hours
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104 oauth2_refresh_token_ttl = nil -- unlimited unless revoked by the user
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105 ```
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106
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107 ### Dynamic client registration
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108
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109 To allow users to connect any compatible software, you should enable dynamic
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110 client registration.
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111
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112 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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113 defaults to *HS256* lifetime defaults to forever.
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114
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115 ```lua
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116 oauth2_registration_key = "securely generated JWT key here"
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117 oauth2_registration_algorithm = "HS256"
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118 oauth2_registration_ttl = nil -- unlimited by default
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119 ```
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120
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121 Registering a client is described in
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122 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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123
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124 In addition to the requirements in the RFC, the following requirements
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125 are enforced:
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126
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127 `client_name`
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128 : **MUST** be present, is shown to users in consent screen.
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129
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130 `client_uri`
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131 : **MUST** be present and **MUST** be a `https://` URL.
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132
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133 `redirect_uris`
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134
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135 : **MUST** contain at least one valid URI. Different rules apply
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136 depending on the value of `application_type`, see below.
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137
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138 `application_type`
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139
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140 : Optional, defaults to `web`. Determines further restrictions for
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141 `redirect_uris`. The following values are supported:
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142
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143 `web` *(default)*
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144 : For web clients. With this, `redirect_uris` **MUST** be
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145 `https://` URIs and **MUST** use the same hostname part as the
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146 `client_uri`.
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147
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148 `native`
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149
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150 `native`
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151
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152 : For native e.g. desktop clients etc. `redirect_uris` **MUST**
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153 match one of:
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154
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155 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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156 `http://[::1]`
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157 - Application-specific scheme, e.g. `com.example.app:/`
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158 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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159
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160 `tos_uri`, `policy_uri`
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161 : Informative URLs pointing to Terms of Service and Service Policy
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162 document **MUST** use the same scheme (i.e. `https://`) and hostname
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163 as the `client_uri`.
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164
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165 #### Registration Examples
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166
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167 In short registration works by POST-ing a JSON structure describing your
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168 client to an endpoint:
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169
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170 ``` bash
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171 curl -sSf https://xmpp.example.net/oauth2/register \
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172 -H Content-Type:application/json \
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173 -H Accept:application/json \
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174 --data '
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175 {
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176 "client_name" : "My Application",
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177 "client_uri" : "https://app.example.com/",
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178 "redirect_uris" : [
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179 "https://app.example.com/redirect"
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180 ]
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181 }
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182 '
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183 ```
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184
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185 Another example with more fields:
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186
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187 ``` bash
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188 curl -sSf https://xmpp.example.net/oauth2/register \
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189 -H Content-Type:application/json \
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190 -H Accept:application/json \
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191 --data '
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192 {
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193 "application_type" : "native",
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194 "client_name" : "Desktop Chat App",
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195 "client_uri" : "https://app.example.org/",
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196 "contacts" : [
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197 "support@example.org"
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198 ],
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199 "policy_uri" : "https://app.example.org/about/privacy",
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200 "redirect_uris" : [
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201 "http://localhost:8080/redirect",
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202 "org.example.app:/redirect"
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203 ],
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204 "scope" : "xmpp",
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205 "software_id" : "32a0a8f3-4016-5478-905a-c373156eca73",
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206 "software_version" : "3.4.1",
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207 "tos_uri" : "https://app.example.org/about/terms"
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208 }
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209 '
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210 ```
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211
5313
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212 ### Supported flows
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213
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214 - Authorization Code grant, optionally with Proof Key for Code Exchange
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215 - Device Authorization Grant
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216 - Resource owner password grant
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217 - Implicit flow *(disabled by default)*
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218 - Refresh Token grants
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219
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220 Various flows can be disabled and enabled with
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221 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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222
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223 ```lua
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224 -- These examples reflect the defaults
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225 allowed_oauth2_grant_types = {
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226 "authorization_code"; -- authorization code grant
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227 "urn:ietf:params:oauth:grant-type:device_code";
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228 "password"; -- resource owner password grant
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229 }
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230
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231 allowed_oauth2_response_types = {
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232 "code"; -- authorization code flow
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233 -- "token"; -- implicit flow disabled by default
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234 }
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235 ```
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236
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237 The [Proof Key for Code Exchange][RFC 7636] mitigation method is
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238 optional by default but can be made required:
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239
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240 ```lua
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241 oauth2_require_code_challenge = true -- default is false
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242 ```
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243
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244 Further, individual challenge methods can be enabled or disabled:
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245
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246 ```lua
5521
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247 -- These reflects the default
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248 allowed_oauth2_code_challenge_methods = {
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249 "plain"; -- the insecure one
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250 "S256";
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251 }
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252 ```
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253
5408
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254 ### Policy documents
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255
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256 Links to Terms of Service and Service Policy documents can be advertised
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257 for use by OAuth clients:
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258
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259 ```lua
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260 oauth2_terms_url = "https://example.com/terms-of-service.html"
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261 oauth2_policy_url = "https://example.com/service-policy.pdf"
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262 -- These are unset by default
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263 ```
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264
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265 ## Deployment notes
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266
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267 ### Access management
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268
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269 This module does not provide an interface for users to manage what they have
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270 granted access to their account! (e.g. to view and revoke clients they have
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271 previously authorized). It is recommended to join this module with
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272 [mod_client_management] to provide such access. However, at the time of writing,
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273 no XMPP clients currently support the protocol used by that module. We plan to
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274 work on additional interfaces in the future.
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275
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276 ### Scopes
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277
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278 OAuth supports "scopes" as a way to grant clients limited access.
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279
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280 There are currently no standard scopes defined for XMPP. This is
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281 something that we intend to change, e.g. by definitions provided in a
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282 future XEP. This means that clients you authorize currently have to
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283 choose between unrestricted access to your account (including the
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284 ability to change your password and lock you out!) and zero access. So,
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285 for now, while using OAuth clients can prevent leaking your password to
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286 them, it is not currently suitable for connecting untrusted clients to
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287 your account.
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288
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289 As a first step, the `xmpp` scope is supported, and corresponds to
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290 whatever permissions the user would have when logged in over XMPP.
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291
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292 Further, known Prosody roles can be used as scopes.
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293
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294 OpenID scopes such as `openid` and `profile` can be used for "Login
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295 with XMPP" without granting access to more than limited profile details.
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296
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297 ## Compatibility
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298
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299 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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300 earlier.