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annotate mod_http_oauth2/README.markdown @ 5571:ca3c2d11823c

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mod_pubsub_feeds: Track latest timestamp seen in feeds instead of last poll This should ensure that an entry that has a publish timestmap after the previously oldest post, but before the time of the last poll check, is published to the node. Previously if an entry would be skipped if it was published at 13:00 with a timestamp of 12:30, where the last poll was at 12:45. For feeds that lack a timestamp, it now looks for the first post that is not published, assuming that the feed is in reverse chronological order, then iterates back up from there.
author Kim Alvefur <zash@zash.se>
date Sun, 25 Jun 2023 16:27:55 +0200
parents 734788d8bfc3
children 59acf7f540c1
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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 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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55 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html) (_partial, e.g. missing JWKS_)
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56 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html)
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57
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58 ## Configuration
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59
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60 ### Interface
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61
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62 The module presents a web page to users to allow them to authenticate when
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63 a client requests access. Built-in pages are provided, but you may also theme
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64 or entirely override them.
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65
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66 This module honours the `site_name` configuration option that is also used by
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67 a number of other modules:
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68
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69 ```lua
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70 site_name = "My XMPP Server"
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71 ```
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72
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73 To provide custom templates, specify the path to the template directory:
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74
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75 ```lua
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76 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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77 ```
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78
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79 Some templates support additional variables, that can be provided by the
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80 `oauth2_template_style` option:
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81
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82 ```lua
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83 oauth2_template_style = {
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84 background_colour = "#ffffff";
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85 }
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86 ```
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87
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88 If you know what features your templates use use you can adjust the
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89 `Content-Security-Policy` header to only allow what is needed:
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90
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91 ```lua
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92 oauth2_security_policy = "default-src 'self'" -- this is the default
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93 ```
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94
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95 ### Token parameters
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96
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97 The following options configure the lifetime of tokens issued by the module.
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98 The defaults are recommended.
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99
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100 ```lua
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101 oauth2_access_token_ttl = 86400 -- 24 hours
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102 oauth2_refresh_token_ttl = nil -- unlimited unless revoked by the user
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103 ```
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104
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105 ### Dynamic client registration
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106
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107 To allow users to connect any compatible software, you should enable dynamic
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108 client registration.
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109
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110 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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111 defaults to *HS256* lifetime defaults to forever.
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112
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113 ```lua
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114 oauth2_registration_key = "securely generated JWT key here"
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115 oauth2_registration_algorithm = "HS256"
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116 oauth2_registration_ttl = nil -- unlimited by default
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117 ```
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118
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119 Registering a client is described in
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120 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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121
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122 In addition to the requirements in the RFC, the following requirements
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123 are enforced:
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124
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125 `client_name`
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126 : **MUST** be present, is shown to users in consent screen.
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127
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128 `client_uri`
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129 : **MUST** be present and **MUST** be a `https://` URL.
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130
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131 `redirect_uris`
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132
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133 : **MUST** contain at least one valid URI. Different rules apply
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134 depending on the value of `application_type`, see below.
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135
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136 `application_type`
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137
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138 : Optional, defaults to `web`. Determines further restrictions for
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139 `redirect_uris`. The following values are supported:
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140
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141 `web` *(default)*
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142 : For web clients. With this, `redirect_uris` **MUST** be
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143 `https://` URIs and **MUST** use the same hostname part as the
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144 `client_uri`.
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145
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146 `native`
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147
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148 `native`
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149
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150 : For native e.g. desktop clients etc. `redirect_uris` **MUST**
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151 match one of:
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152
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153 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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154 `http://[::1]`
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155 - Application-specific scheme, e.g. `com.example.app:/`
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156 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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157
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158 `tos_uri`, `policy_uri`
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159 : Informative URLs pointing to Terms of Service and Service Policy
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160 document **MUST** use the same scheme (i.e. `https://`) and hostname
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161 as the `client_uri`.
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162
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163 #### Registration Examples
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164
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165 In short registration works by POST-ing a JSON structure describing your
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166 client to an endpoint:
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167
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168 ``` bash
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169 curl -sSf https://xmpp.example.net/oauth2/register \
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170 -H Content-Type:application/json \
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171 -H Accept:application/json \
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172 --data '
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173 {
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174 "client_name" : "My Application",
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175 "client_uri" : "https://app.example.com/",
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176 "redirect_uris" : [
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177 "https://app.example.com/redirect"
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178 ]
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179 }
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180 '
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181 ```
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182
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183 Another example with more fields:
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184
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185 ``` bash
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186 curl -sSf https://xmpp.example.net/oauth2/register \
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187 -H Content-Type:application/json \
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188 -H Accept:application/json \
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189 --data '
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190 {
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191 "application_type" : "native",
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192 "client_name" : "Desktop Chat App",
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193 "client_uri" : "https://app.example.org/",
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194 "contacts" : [
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195 "support@example.org"
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196 ],
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197 "policy_uri" : "https://app.example.org/about/privacy",
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198 "redirect_uris" : [
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199 "http://localhost:8080/redirect",
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200 "org.example.app:/redirect"
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201 ],
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202 "scope" : "xmpp",
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203 "software_id" : "32a0a8f3-4016-5478-905a-c373156eca73",
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204 "software_version" : "3.4.1",
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205 "tos_uri" : "https://app.example.org/about/terms"
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206 }
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207 '
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208 ```
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209
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210 ### Supported flows
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211
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212 - Authorization Code grant, optionally with Proof Key for Code Exchange
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213 - Resource owner password grant
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214 - Implicit flow *(disabled by default)*
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215 - Refresh Token grants
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216
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217 Various flows can be disabled and enabled with
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218 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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219
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220 ```lua
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221 -- These examples reflect the defaults
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222 allowed_oauth2_grant_types = {
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223 "authorization_code"; -- authorization code grant
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224 "password"; -- resource owner password grant
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225 }
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226
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227 allowed_oauth2_response_types = {
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228 "code"; -- authorization code flow
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229 -- "token"; -- implicit flow disabled by default
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230 }
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231 ```
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232
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233 The [Proof Key for Code Exchange][RFC 7636] mitigation method is
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234 optional by default but can be made required:
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235
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236 ```lua
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237 oauth2_require_code_challenge = true -- default is false
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238 ```
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239
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240 Further, individual challenge methods can be enabled or disabled:
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241
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242 ```lua
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243 -- These reflects the default
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244 allowed_oauth2_code_challenge_methods = {
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245 "plain"; -- the insecure one
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246 "S256";
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247 }
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248 ```
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249
5408
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250 ### Policy documents
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251
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252 Links to Terms of Service and Service Policy documents can be advertised
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253 for use by OAuth clients:
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254
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255 ```lua
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256 oauth2_terms_url = "https://example.com/terms-of-service.html"
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257 oauth2_policy_url = "https://example.com/service-policy.pdf"
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258 -- These are unset by default
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259 ```
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260
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261 ## Deployment notes
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262
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263 ### Access management
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264
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265 This module does not provide an interface for users to manage what they have
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266 granted access to their account! (e.g. to view and revoke clients they have
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267 previously authorized). It is recommended to join this module with
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268 [mod_client_management] to provide such access. However, at the time of writing,
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269 no XMPP clients currently support the protocol used by that module. We plan to
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270 work on additional interfaces in the future.
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271
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272 ### Scopes
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273
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274 OAuth supports "scopes" as a way to grant clients limited access.
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275
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276 There are currently no standard scopes defined for XMPP. This is
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277 something that we intend to change, e.g. by definitions provided in a
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278 future XEP. This means that clients you authorize currently have to
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279 choose between unrestricted access to your account (including the
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280 ability to change your password and lock you out!) and zero access. So,
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281 for now, while using OAuth clients can prevent leaking your password to
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282 them, it is not currently suitable for connecting untrusted clients to
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283 your account.
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284
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285 As a first step, the `xmpp` scope is supported, and corresponds to
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286 whatever permissions the user would have when logged in over XMPP.
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287
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288 Further, known Prosody roles can be used as scopes.
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289
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290 OpenID scopes such as `openid` and `profile` can be used for "Login
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291 with XMPP" without granting access to more than limited profile details.
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292
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293 ## Compatibility
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294
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295 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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296 earlier.