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mod_http_oauth2/README.markdown

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mod_password_policy: Change error type from 'cancel' to 'modify' This makes more sense, as the problem relates to the data that has been entered, and therefore the request could be retried with different data.
author Matthew Wild <mwild1@gmail.com>
date Mon, 08 Jan 2024 17:28:39 +0000
parent 5739:426c42c11f89
child 5882:761142ee0ff2
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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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10
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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/) Authorization Server 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 7662: OAuth 2.0 Token Introspection](https://www.rfc-editor.org/rfc/rfc7662)
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55 - [RFC 8628: OAuth 2.0 Device Authorization Grant](https://www.rfc-editor.org/rfc/rfc8628)
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56 - [RFC 9207: OAuth 2.0 Authorization Server Issuer Identification](https://www.rfc-editor.org/rfc/rfc9207.html)
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57 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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58 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html) (_partial, e.g. missing JWKS_)
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59 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html)
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60
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61 ## Configuration
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62
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63 ### Interface
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64
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65 The module presents a web page to users to allow them to authenticate when
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66 a client requests access. Built-in pages are provided, but you may also theme
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67 or entirely override them.
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68
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69 This module honours the `site_name` configuration option that is also used by
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70 a number of other modules:
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71
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72 ```lua
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73 site_name = "My XMPP Server"
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74 ```
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75
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76 To provide custom templates, specify the path to the template directory:
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77
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78 ```lua
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79 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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80 ```
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81
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82 If you know what features your templates use use you can adjust the
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83 `Content-Security-Policy` header to only allow what is needed:
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84
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85 ```lua
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86 oauth2_security_policy = "default-src 'self'" -- this is the default
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87 ```
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88
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89 ### Token parameters
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90
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91 The following options configure the lifetime of tokens issued by the module.
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92 The defaults are recommended.
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93
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94 ```lua
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95 oauth2_access_token_ttl = 3600 -- one hour
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96 oauth2_refresh_token_ttl = 604800 -- one week
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97 ```
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98
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99 ### Dynamic client registration
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100
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101 To allow users to connect any compatible software, you should enable dynamic
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102 client registration.
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103
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104 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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105 defaults to *HS256* lifetime defaults to forever.
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106
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107 ```lua
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108 oauth2_registration_key = "securely generated JWT key here"
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109 oauth2_registration_algorithm = "HS256"
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110 oauth2_registration_ttl = nil -- unlimited by default
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111 ```
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112
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113 Registering a client is described in
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114 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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115
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116 In addition to the requirements in the RFC, the following requirements
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117 are enforced:
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118
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119 `client_name`
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120 : **MUST** be present, is shown to users in consent screen.
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121
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122 `client_uri`
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123 : **MUST** be present and **MUST** be a `https://` URL.
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124
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125 `redirect_uris`
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126
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127 : **MUST** contain at least one valid URI. Different rules apply
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128 depending on the value of `application_type`, see below.
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129
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130 `application_type`
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131
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132 : Optional, defaults to `web`. Determines further restrictions for
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133 `redirect_uris`. The following values are supported:
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134
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135 `web` *(default)*
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136 : For web clients. With this, `redirect_uris` **MUST** be
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137 `https://` URIs and **MUST** use the same hostname part as the
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138 `client_uri`.
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139
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140 `native`
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141 : For native e.g. desktop clients etc. `redirect_uris` **MUST**
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142 match one of:
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143
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144 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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145 `http://[::1]`
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146 - Application-specific scheme, e.g. `com.example.app:/`
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147 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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148
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149 `tos_uri`, `policy_uri`
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150 : Informative URLs pointing to Terms of Service and Service Policy
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151 document **MUST** use the same scheme (i.e. `https://`) and hostname
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152 as the `client_uri`.
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153
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154 #### Registration Examples
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155
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156 In short registration works by POST-ing a JSON structure describing your
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157 client to an endpoint:
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158
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159 ``` bash
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160 curl -sSf https://xmpp.example.net/oauth2/register \
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161 -H Content-Type:application/json \
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162 -H Accept:application/json \
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163 --data '
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164 {
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165 "client_name" : "My Application",
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166 "client_uri" : "https://app.example.com/",
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167 "redirect_uris" : [
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168 "https://app.example.com/redirect"
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169 ]
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170 }
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171 '
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172 ```
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173
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174 Another example with more fields:
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175
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176 ``` bash
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177 curl -sSf https://xmpp.example.net/oauth2/register \
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178 -H Content-Type:application/json \
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179 -H Accept:application/json \
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180 --data '
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181 {
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182 "application_type" : "native",
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183 "client_name" : "Desktop Chat App",
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184 "client_uri" : "https://app.example.org/",
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185 "contacts" : [
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186 "support@example.org"
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187 ],
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188 "policy_uri" : "https://app.example.org/about/privacy",
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189 "redirect_uris" : [
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190 "http://localhost:8080/redirect",
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191 "org.example.app:/redirect"
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192 ],
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193 "scope" : "xmpp",
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194 "software_id" : "32a0a8f3-4016-5478-905a-c373156eca73",
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195 "software_version" : "3.4.1",
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196 "tos_uri" : "https://app.example.org/about/terms"
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197 }
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198 '
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199 ```
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200
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201 ### Supported flows
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202
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203 - Authorization Code grant, optionally with Proof Key for Code Exchange
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204 - Device Authorization Grant
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205 - Resource owner password grant *(likely to be phased out in the future)*
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206 - Implicit flow *(disabled by default)*
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207 - Refresh Token grants
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208
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209 Various flows can be disabled and enabled with
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210 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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211
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212 ```lua
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213 -- These examples reflect the defaults
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214 allowed_oauth2_grant_types = {
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215 "authorization_code"; -- authorization code grant
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216 "device_code";
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217 "password"; -- resource owner password grant
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218 }
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219
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220 allowed_oauth2_response_types = {
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221 "code"; -- authorization code flow
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222 -- "token"; -- implicit flow disabled by default
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223 }
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224 ```
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225
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226 The [Proof Key for Code Exchange][RFC 7636] mitigation method is
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227 required by default but can be made optional:
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228
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229 ```lua
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230 oauth2_require_code_challenge = false -- default is true
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231 ```
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232
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233 Further, individual challenge methods can be enabled or disabled:
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234
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235 ```lua
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236 -- These reflects the default
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237 allowed_oauth2_code_challenge_methods = {
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238 -- "plain"; -- insecure but backwards-compatible
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239 "S256";
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240 }
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241 ```
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242
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243 ### Policy documents
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244
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245 Links to Terms of Service and Service Policy documents can be advertised
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246 for use by OAuth clients:
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247
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248 ```lua
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249 oauth2_terms_url = "https://example.com/terms-of-service.html"
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250 oauth2_policy_url = "https://example.com/service-policy.pdf"
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251 -- These are unset by default
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252 ```
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253
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254 ## Deployment notes
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255
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256 ### Access management
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257
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258 This module does not provide an interface for users to manage what they have
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259 granted access to their account! (e.g. to view and revoke clients they have
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260 previously authorized). It is recommended to join this module with
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261 [mod_client_management] to provide such access. However, at the time of writing,
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262 no XMPP clients currently support the protocol used by that module. We plan to
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263 work on additional interfaces in the future.
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264
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265 ### Scopes
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266
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267 OAuth supports "scopes" as a way to grant clients limited access.
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268
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269 There are currently no standard scopes defined for XMPP. This is
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270 something that we intend to change, e.g. by definitions provided in a
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271 future XEP. This means that clients you authorize currently have to
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272 choose between unrestricted access to your account (including the
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273 ability to change your password and lock you out!) and zero access. So,
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274 for now, while using OAuth clients can prevent leaking your password to
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275 them, it is not currently suitable for connecting untrusted clients to
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276 your account.
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277
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278 As a first step, the `xmpp` scope is supported, and corresponds to
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279 whatever permissions the user would have when logged in over XMPP.
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280
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281 Further, known Prosody roles can be used as scopes.
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282
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283 OpenID scopes such as `openid` and `profile` can be used for "Login
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284 with XMPP" without granting access to more than limited profile details.
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285
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286 ## Compatibility
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287
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288 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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289 earlier.