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annotate mod_http_oauth2/README.markdown @ 5616:59d5fc50f602

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mod_http_oauth2: Implement refresh token rotation Makes refresh tokens one-time-use, handing out a new refresh token with each access token. Thus if a refresh token is stolen and used by an attacker, the next time the legitimate client tries to use the previous refresh token, it will not work and the attack will be noticed. If the attacker does not use the refresh token, it becomes invalid after the legitimate client uses it. This behavior is recommended by draft-ietf-oauth-security-topics
author Kim Alvefur <zash@zash.se>
date Sun, 23 Jul 2023 02:56:08 +0200
parents 308b5b117379
children d8622797e315
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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
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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 *(likely to be phased out in the future)*
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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 "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
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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
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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.