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annotate mod_http_oauth2/README.markdown @ 5648:c217f4edfc4f

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misc/mtail: Start of an mtail config Stashing it here in case anyone wants to continue working on it. Currently it's only counting log messages by level. Due to the permissions set by systemd on Prosody logs, mtail never managed to start correctly until permissions were manually relaxed.
author Kim Alvefur <zash@zash.se>
date Sun, 17 Sep 2023 13:36:30 +0200
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children b43c989fb69c
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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/) 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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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 If you know what features your templates use use you can adjust the
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82 `Content-Security-Policy` header to only allow what is needed:
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83
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84 ```lua
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85 oauth2_security_policy = "default-src 'self'" -- this is the default
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86 ```
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87
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88 ### Token parameters
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89
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90 The following options configure the lifetime of tokens issued by the module.
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91 The defaults are recommended.
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92
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93 ```lua
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94 oauth2_access_token_ttl = 3600 -- one hour
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95 oauth2_refresh_token_ttl = 604800 -- one week
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96 ```
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97
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98 ### Dynamic client registration
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99
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100 To allow users to connect any compatible software, you should enable dynamic
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101 client registration.
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102
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103 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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104 defaults to *HS256* lifetime defaults to forever.
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105
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106 ```lua
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107 oauth2_registration_key = "securely generated JWT key here"
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108 oauth2_registration_algorithm = "HS256"
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109 oauth2_registration_ttl = nil -- unlimited by default
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110 ```
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111
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112 Registering a client is described in
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113 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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114
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115 In addition to the requirements in the RFC, the following requirements
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116 are enforced:
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117
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118 `client_name`
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119 : **MUST** be present, is shown to users in consent screen.
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120
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121 `client_uri`
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122 : **MUST** be present and **MUST** be a `https://` URL.
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123
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124 `redirect_uris`
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125
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126 : **MUST** contain at least one valid URI. Different rules apply
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127 depending on the value of `application_type`, see below.
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128
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129 `application_type`
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130
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131 : Optional, defaults to `web`. Determines further restrictions for
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132 `redirect_uris`. The following values are supported:
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133
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134 `web` *(default)*
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135 : For web clients. With this, `redirect_uris` **MUST** be
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136 `https://` URIs and **MUST** use the same hostname part as the
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137 `client_uri`.
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138
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139 `native`
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140 : For native e.g. desktop clients etc. `redirect_uris` **MUST**
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141 match one of:
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142
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143 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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144 `http://[::1]`
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145 - Application-specific scheme, e.g. `com.example.app:/`
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146 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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147
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148 `tos_uri`, `policy_uri`
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149 : Informative URLs pointing to Terms of Service and Service Policy
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150 document **MUST** use the same scheme (i.e. `https://`) and hostname
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151 as the `client_uri`.
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152
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153 #### Registration Examples
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154
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155 In short registration works by POST-ing a JSON structure describing your
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156 client to an endpoint:
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157
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158 ``` bash
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159 curl -sSf https://xmpp.example.net/oauth2/register \
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160 -H Content-Type:application/json \
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161 -H Accept:application/json \
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162 --data '
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163 {
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164 "client_name" : "My Application",
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165 "client_uri" : "https://app.example.com/",
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166 "redirect_uris" : [
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167 "https://app.example.com/redirect"
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168 ]
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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 Another example with more fields:
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174
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175 ``` bash
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176 curl -sSf https://xmpp.example.net/oauth2/register \
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177 -H Content-Type:application/json \
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178 -H Accept:application/json \
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179 --data '
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180 {
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181 "application_type" : "native",
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182 "client_name" : "Desktop Chat App",
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183 "client_uri" : "https://app.example.org/",
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184 "contacts" : [
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185 "support@example.org"
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186 ],
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187 "policy_uri" : "https://app.example.org/about/privacy",
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188 "redirect_uris" : [
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189 "http://localhost:8080/redirect",
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190 "org.example.app:/redirect"
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191 ],
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192 "scope" : "xmpp",
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193 "software_id" : "32a0a8f3-4016-5478-905a-c373156eca73",
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194 "software_version" : "3.4.1",
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195 "tos_uri" : "https://app.example.org/about/terms"
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196 }
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197 '
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198 ```
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199
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200 ### Supported flows
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201
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202 - Authorization Code grant, optionally with Proof Key for Code Exchange
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203 - Device Authorization Grant
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204 - Resource owner password grant *(likely to be phased out in the future)*
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205 - Implicit flow *(disabled by default)*
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206 - Refresh Token grants
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207
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208 Various flows can be disabled and enabled with
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209 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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210
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211 ```lua
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212 -- These examples reflect the defaults
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213 allowed_oauth2_grant_types = {
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214 "authorization_code"; -- authorization code grant
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215 "device_code";
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216 "password"; -- resource owner password grant
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217 }
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218
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219 allowed_oauth2_response_types = {
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220 "code"; -- authorization code flow
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221 -- "token"; -- implicit flow disabled by default
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222 }
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223 ```
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224
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225 The [Proof Key for Code Exchange][RFC 7636] mitigation method is
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226 optional by default but can be made required:
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227
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228 ```lua
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229 oauth2_require_code_challenge = true -- default is false
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230 ```
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231
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232 Further, individual challenge methods can be enabled or disabled:
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233
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234 ```lua
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235 -- These reflects the default
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236 allowed_oauth2_code_challenge_methods = {
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237 "plain"; -- the insecure one
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238 "S256";
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239 }
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240 ```
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241
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242 ### Policy documents
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243
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244 Links to Terms of Service and Service Policy documents can be advertised
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245 for use by OAuth clients:
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246
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247 ```lua
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248 oauth2_terms_url = "https://example.com/terms-of-service.html"
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249 oauth2_policy_url = "https://example.com/service-policy.pdf"
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250 -- These are unset by default
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251 ```
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252
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253 ## Deployment notes
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254
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255 ### Access management
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256
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257 This module does not provide an interface for users to manage what they have
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258 granted access to their account! (e.g. to view and revoke clients they have
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259 previously authorized). It is recommended to join this module with
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260 [mod_client_management] to provide such access. However, at the time of writing,
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261 no XMPP clients currently support the protocol used by that module. We plan to
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262 work on additional interfaces in the future.
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263
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264 ### Scopes
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265
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266 OAuth supports "scopes" as a way to grant clients limited access.
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267
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268 There are currently no standard scopes defined for XMPP. This is
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269 something that we intend to change, e.g. by definitions provided in a
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270 future XEP. This means that clients you authorize currently have to
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271 choose between unrestricted access to your account (including the
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272 ability to change your password and lock you out!) and zero access. So,
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273 for now, while using OAuth clients can prevent leaking your password to
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274 them, it is not currently suitable for connecting untrusted clients to
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275 your account.
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276
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277 As a first step, the `xmpp` scope is supported, and corresponds to
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278 whatever permissions the user would have when logged in over XMPP.
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279
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280 Further, known Prosody roles can be used as scopes.
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281
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282 OpenID scopes such as `openid` and `profile` can be used for "Login
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283 with XMPP" without granting access to more than limited profile details.
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284
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285 ## Compatibility
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286
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287 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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288 earlier.