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annotate mod_http_oauth2/README.markdown @ 5518:d87d0e4a8516

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mod_http_oauth2: Validate the OpenID 'prompt' parameter Without support for affecting the login and consent procedure, it seems sensible to inform the client that they can't change anything with this parameter.
author Kim Alvefur <zash@zash.se>
date Mon, 05 Jun 2023 22:19:17 +0200
parents 56803acfa638
children 67448e677706
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1 ---
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2 labels:
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3 - Stage-Alpha
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4 summary: 'OAuth2 API'
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5 rockspec:
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6 build:
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7 copy_directories:
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8 - html
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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 "access
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22 tokens" from Prosody which can then be used to connect to XMPP accounts using
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23 the 'OAUTHBEARER' SASL mechanism or via non-XMPP interfaces such as [mod_rest].
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24
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25 Although this module has been around for some time, it has recently been
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26 significantly extended and largely rewritten to support OAuth/OIDC more fully.
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27
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28 As of April 2023, it should be considered **alpha** stage. It works, we have
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29 tested it, but it has not yet seen wider review, testing and deployment. At
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30 this stage we recommend it for experimental and test deployments only. For
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31 specific information, see the [deployment notes section](#deployment-notes)
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32 below.
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33
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34 Known client implementations:
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35
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36 - [example shell script for mod_rest](https://hg.prosody.im/prosody-modules/file/tip/mod_rest/example/rest.sh)
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37 - *(we need you!)*
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38
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39 Support for OAUTHBEARER has been added to the Lua XMPP library, [verse](https://code.matthewwild.co.uk/verse).
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40 If you know of additional implementations, or are motivated to work on one,
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41 please let us know! We'd be happy to help (e.g. by providing a test server).
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42
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43 ## Standards support
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44
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45 Notable supported standards:
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46
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47 - [RFC 6749: The OAuth 2.0 Authorization Framework](https://www.rfc-editor.org/rfc/rfc6749)
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48 - [RFC 7009: OAuth 2.0 Token Revocation](https://www.rfc-editor.org/rfc/rfc7009)
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49 - [RFC 7591: OAuth 2.0 Dynamic Client Registration](https://www.rfc-editor.org/rfc/rfc7591.html)
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50 - [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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51 - [RFC 7636: Proof Key for Code Exchange by OAuth Public Clients](https://www.rfc-editor.org/rfc/rfc7636)
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52 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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53 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html) (_partial, e.g. missing JWKS_)
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54 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html)
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55
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56 ## Configuration
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57
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58 ### Interface
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59
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60 The module presents a web page to users to allow them to authenticate when
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61 a client requests access. Built-in pages are provided, but you may also theme
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62 or entirely override them.
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63
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64 This module honours the 'site_name' configuration option that is also used by
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65 a number of other modules:
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66
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67 ```lua
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68 site_name = "My XMPP Server"
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69 ```
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70
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71 To provide custom templates, specify the path to the template directory:
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72
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73 ```lua
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74 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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75 ```
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76
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77 Some templates support additional variables, that can be provided by the
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78 'oauth2_template_style' option:
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79
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80 ```lua
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81 oauth2_template_style = {
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82 background_colour = "#ffffff";
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83 }
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84 ```
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85
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86 ### Token parameters
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87
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88 The following options configure the lifetime of tokens issued by the module.
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89 The defaults are recommended.
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90
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91 ```lua
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92 oauth2_access_token_ttl = 86400 -- 24 hours
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93 oauth2_refresh_token_ttl = nil -- unlimited unless revoked by the user
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94 ```
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95
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96 ### Dynamic client registration
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97
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98 To allow users to connect any compatible software, you should enable dynamic
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99 client registration.
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100
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101 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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102 defaults to *HS256* lifetime defaults to forever.
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103
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104 ```lua
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105 oauth2_registration_key = "securely generated JWT key here"
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106 oauth2_registration_algorithm = "HS256"
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107 oauth2_registration_ttl = nil -- unlimited by default
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108 ```
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109
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110 Registering a client is described in
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111 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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112
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113 In addition to the requirements in the RFC, the following requirements
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114 are enforced:
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115
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116 `client_name`
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117 : **MUST** be present, is shown to users in consent screen.
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118
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119 `client_uri`
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120 : **MUST** be present and **MUST** be a `https://` URL.
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121
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122 `redirect_uris`
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123
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124 : **MUST** contain at least one valid URI. Different rules apply
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125 depending on the value of `application_type`:
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126
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127 `web`
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128 : `redirect_uris` **MUST** be `https://` URIs and **MUST** use the
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129 same hostname part as the `client_uri`.
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130
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131 `native`
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132
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133 : `redirect_uris` **MUST** match one of:
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134
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135 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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136 `http://[::1]`
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137 - Application-specific scheme, e.g. `com.example.app:/`
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138 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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139
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140 `application_type`
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141
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142 : Optional, defaults to `web`. Determines further restrictions for
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143 `redirect_uris`. The following values are supported:
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144
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145 `web` *(default)*
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146 : For web clients.
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147
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148 `native`
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149 : For native e.g. desktop clients etc.
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150
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151 `tos_uri`, `policy_uri`
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152 : Informative URLs pointing to Terms of Service and Service Policy
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153 document **MUST** use the same scheme (i.e. `https://`) and hostname
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154 as the `client_uri`.
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155
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156 #### Registration Example
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157
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158 In short registration works by POST-ing a JSON structure describing your
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159 client to an endpoint:
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160
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161 ``` bash
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162 curl -sSf https://xmpp.example.net/oauth2/register \
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163 -H Content-Type:application/json \
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164 -H Accept:application/json \
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165 --data '
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166 {
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167 "client_name" : "My Application",
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168 "client_uri" : "https://app.example.com/",
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169 "redirect_uris" : [
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170 "https://app.example.com/redirect"
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171 ]
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172 }
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173 '
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174 ```
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175
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176 ### Supported flows
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177
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178 Various flows can be disabled and enabled with
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179 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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180
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181 ```lua
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182 allowed_oauth2_grant_types = {
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183 "authorization_code"; -- authorization code grant
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184 "password"; -- resource owner password grant
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185 }
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186
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187 allowed_oauth2_response_types = {
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188 "code"; -- authorization code flow
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189 -- "token"; -- implicit flow disabled by default
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190 }
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191 ```
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192
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193 The [Proof Key for Code Exchange][RFC 7636] mitigation method can be
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194 made required:
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195
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196 ```lua
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197 oauth2_require_code_challenge = true
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198 ```
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199
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200 Further, individual challenge methods can be enabled or disabled:
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201
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202 ```lua
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203 allowed_oauth2_code_challenge_methods = {
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204 "plain"; -- the insecure one
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205 "S256";
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206 }
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207 ```
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208
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209 ### Policy documents
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210
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211 Links to Terms of Service and Service Policy documents can be advertised
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212 for use by OAuth clients:
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213
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214 ```lua
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215 oauth2_terms_url = "https://example.com/terms-of-service.html"
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216 oauth2_policy_url = "https://example.com/service-policy.pdf"
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217 ```
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218
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219 ## Deployment notes
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220
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221 ### Access management
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222
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223 This module does not provide an interface for users to manage what they have
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224 granted access to their account! (e.g. to view and revoke clients they have
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225 previously authorized). It is recommended to join this module with
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226 [mod_client_management] to provide such access. However, at the time of writing,
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227 no XMPP clients currently support the protocol used by that module. We plan to
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228 work on additional interfaces in the future.
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229
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230 ### Scopes
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231
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232 OAuth supports "scopes" as a way to grant clients limited access.
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233
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234 There are currently no standard scopes defined for XMPP. This is
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235 something that we intend to change, e.g. by definitions provided in a
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236 future XEP. This means that clients you authorize currently have to
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237 choose between unrestricted access to your account (including the
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238 ability to change your password and lock you out!) and zero access. So,
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239 for now, while using OAuth clients can prevent leaking your password to
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240 them, it is not currently suitable for connecting untrusted clients to
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241 your account.
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242
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243 As a first step, the `xmpp` scope is supported, and corresponds to
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244 whatever permissions the user would have when logged in over XMPP.
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245
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246 Further, known Prosody roles can be used as scopes.
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247
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248 OpenID scopes such as `openid` and `profile` can be used for "Login
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249 with XMPP" without granting access to more than limited profile details.
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250
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251 ## Compatibility
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252
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253 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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254 earlier.