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mod_http_oauth2: Guard against malformed authorization header Prevent error on calling :lower() afterwards
author Kim Alvefur <zash@zash.se>
date Mon, 15 Jul 2024 20:02:25 +0200
parents 761142ee0ff2
children
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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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20
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21 With this module deployed, software that supports OAuth can obtain
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22 "access tokens" from Prosody which can then be used to connect to XMPP
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23 accounts using the [OAUTHBEARER SASL mechanism][rfc7628] or via non-XMPP
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24 interfaces such as [mod_rest].
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25
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26 Although this module has been around for some time, it has recently been
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27 significantly extended and largely rewritten to support OAuth/OIDC more fully.
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29 As of April 2023, it should be considered **alpha** stage. It works, we have
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30 tested it, but it has not yet seen wider review, testing and deployment. At
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31 this stage we recommend it for experimental and test deployments only. For
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32 specific information, see the [deployment notes section](#deployment-notes)
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33 below.
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34
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35 Known client implementations:
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36
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37 - [example shell script for mod_rest](https://hg.prosody.im/prosody-modules/file/tip/mod_rest/example/rest.sh)
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38 - *(we need you!)*
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39
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40 Support for [OAUTHBEARER][rfc7628] has been added to the Lua XMPP
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41 library, [verse](https://code.matthewwild.co.uk/verse). If you know of
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42 additional implementations, or are motivated to work on one, please let
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43 us know! We'd be happy to help (e.g. by providing a test server).
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44
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45 ## Standards support
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46
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47 Notable supported standards:
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48
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49 - [RFC 6749: The OAuth 2.0 Authorization Framework](https://www.rfc-editor.org/rfc/rfc6749)
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50 - [RFC 7009: OAuth 2.0 Token Revocation](https://www.rfc-editor.org/rfc/rfc7009)
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51 - [RFC 7591: OAuth 2.0 Dynamic Client Registration](https://www.rfc-editor.org/rfc/rfc7591.html)
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52 - [RFC 7628: A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth](https://www.rfc-editor.org/rfc/rfc7628)
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53 - [RFC 7636: Proof Key for Code Exchange by OAuth Public Clients](https://www.rfc-editor.org/rfc/rfc7636)
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54 - [RFC 7662: OAuth 2.0 Token Introspection](https://www.rfc-editor.org/rfc/rfc7662)
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55 - [RFC 8628: OAuth 2.0 Device Authorization Grant](https://www.rfc-editor.org/rfc/rfc8628)
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56 - [RFC 9207: OAuth 2.0 Authorization Server Issuer Identification](https://www.rfc-editor.org/rfc/rfc9207.html)
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57 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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58 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html) (_partial, e.g. missing JWKS_)
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59 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html)
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60
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61 ## Configuration
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62
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63 ### Interface
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64
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65 The module presents a web page to users to allow them to authenticate when
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66 a client requests access. Built-in pages are provided, but you may also theme
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67 or entirely override them.
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68
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69 This module honours the `site_name` configuration option that is also used by
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70 a number of other modules:
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71
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72 ```lua
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73 site_name = "My XMPP Server"
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74 ```
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75
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76 To provide custom templates, specify the path to the template directory:
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77
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78 ```lua
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79 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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80 ```
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81
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82 If you know what features your templates use use you can adjust the
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83 `Content-Security-Policy` header to only allow what is needed:
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84
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85 ```lua
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86 oauth2_security_policy = "default-src 'self'" -- this is the default
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87 ```
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88
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89 ### Token parameters
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90
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91 The following options configure the lifetime of tokens issued by the module.
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92 The defaults are recommended.
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93
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94 ```lua
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95 oauth2_access_token_ttl = 3600 -- one hour
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96 oauth2_refresh_token_ttl = 604800 -- one week
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97 ```
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98
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99 ### Dynamic client registration
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100
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101 To allow users to connect any compatible software, you should enable dynamic
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102 client registration.
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103
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104 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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105 defaults to *HS256*, lifetime defaults to forever.
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106
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107 ```lua
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108 oauth2_registration_key = "securely generated JWT key here"
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109 oauth2_registration_algorithm = "HS256"
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110 oauth2_registration_ttl = nil -- unlimited by default
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111 ```
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112
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113 Registering a client is described in
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114 [RFC7591](https://www.rfc-editor.org/rfc/rfc7591.html).
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115
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116 In addition to the requirements in the RFC, the following requirements
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117 are enforced:
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118
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119 `client_name`
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120 : **MUST** be present, is shown to users in consent screen.
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121
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122 `client_uri`
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123 : **MUST** be present and **MUST** be a `https://` URL.
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124
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125 `redirect_uris`
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126
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127 : **MUST** contain at least one valid URI. Different rules apply
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128 depending on the value of `application_type`, see below.
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129
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130 `application_type`
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131
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132 : Optional, defaults to `web`. Determines further restrictions for
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133 `redirect_uris`. The following values are supported:
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134
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135 `web` *(default)*
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136 : For web clients. With this, `redirect_uris` **MUST** be
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137 `https://` URIs and **MUST** use the same hostname part as the
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138 `client_uri`.
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139
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140 `native`
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141 : For native e.g. desktop clients etc. `redirect_uris` **MUST**
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142 match one of:
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143
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144 - Loopback HTTP URI, e.g. `http://127.0.0.1/` or
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145 `http://[::1]`
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146 - Application-specific scheme, e.g. `com.example.app:/`
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147 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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148
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149 `tos_uri`, `policy_uri`
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150 : Informative URLs pointing to Terms of Service and Service Policy
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151 document **MUST** use the same scheme (i.e. `https://`) and hostname
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152 as the `client_uri`.
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153
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154 #### Registration Examples
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155
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156 In short registration works by POST-ing a JSON structure describing your
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157 client to an endpoint:
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158
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159 ``` bash
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160 curl -sSf https://xmpp.example.net/oauth2/register \
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161 -H Content-Type:application/json \
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162 -H Accept:application/json \
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163 --data '
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164 {
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165 "client_name" : "My Application",
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166 "client_uri" : "https://app.example.com/",
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167 "redirect_uris" : [
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168 "https://app.example.com/redirect"
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169 ]
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170 }
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171 '
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172 ```
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173
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174 Another example with more fields:
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175
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176 ``` bash
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177 curl -sSf https://xmpp.example.net/oauth2/register \
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178 -H Content-Type:application/json \
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179 -H Accept:application/json \
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180 --data '
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181 {
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182 "application_type" : "native",
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183 "client_name" : "Desktop Chat App",
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184 "client_uri" : "https://app.example.org/",
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185 "contacts" : [
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186 "support@example.org"
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187 ],
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188 "policy_uri" : "https://app.example.org/about/privacy",
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189 "redirect_uris" : [
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190 "http://localhost:8080/redirect",
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191 "org.example.app:/redirect"
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192 ],
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193 "scope" : "xmpp",
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194 "software_id" : "32a0a8f3-4016-5478-905a-c373156eca73",
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195 "software_version" : "3.4.1",
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196 "tos_uri" : "https://app.example.org/about/terms"
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197 }
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198 '
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199 ```
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200
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201 ### Supported flows
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202
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203 - Authorization Code grant, optionally with Proof Key for Code Exchange
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204 - Device Authorization Grant
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205 - Resource owner password grant *(disabled by default)*
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206 - Implicit flow *(disabled by default)*
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207 - Refresh Token grants
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208
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209 Various flows can be disabled and enabled with
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210 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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211
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212 ```lua
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213 -- These examples reflect the defaults
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214 allowed_oauth2_grant_types = {
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215 "authorization_code"; -- authorization code grant
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216 "device_code";
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217 -- "password"; -- resource owner password grant disabled by default
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218 }
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219
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220 allowed_oauth2_response_types = {
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221 "code"; -- authorization code flow
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222 -- "token"; -- implicit flow disabled by default
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223 }
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224 ```
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225
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226 The [Proof Key for Code Exchange][RFC 7636] mitigation method is
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227 required by default but can be made optional:
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228
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229 ```lua
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230 oauth2_require_code_challenge = false -- default is true
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231 ```
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232
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233 Further, individual challenge methods can be enabled or disabled:
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234
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235 ```lua
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236 -- These reflects the default
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237 allowed_oauth2_code_challenge_methods = {
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238 -- "plain"; -- insecure but backwards-compatible
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239 "S256";
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240 }
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241 ```
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242
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243 ### Policy documents
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244
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245 Links to Terms of Service and Service Policy documents can be advertised
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246 for use by OAuth clients:
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247
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248 ```lua
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249 oauth2_terms_url = "https://example.com/terms-of-service.html"
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250 oauth2_policy_url = "https://example.com/service-policy.pdf"
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251 -- These are unset by default
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252 ```
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253
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254 ## Deployment notes
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parents:
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255
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256 ### Access management
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257
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258 This module does not provide an interface for users to manage what they have
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259 granted access to their account! (e.g. to view and revoke clients they have
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260 previously authorized). It is recommended to join this module with
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261 [mod_client_management] to provide such access. However, at the time of writing,
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262 no XMPP clients currently support the protocol used by that module. We plan to
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263 work on additional interfaces in the future.
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264
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265 ### Scopes
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266
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267 OAuth supports "scopes" as a way to grant clients limited access.
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268
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269 There are currently no standard scopes defined for XMPP. This is
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270 something that we intend to change, e.g. by definitions provided in a
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271 future XEP. This means that clients you authorize currently have to
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272 choose between unrestricted access to your account (including the
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273 ability to change your password and lock you out!) and zero access. So,
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274 for now, while using OAuth clients can prevent leaking your password to
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275 them, it is not currently suitable for connecting untrusted clients to
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276 your account.
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277
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278 As a first step, the `xmpp` scope is supported, and corresponds to
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279 whatever permissions the user would have when logged in over XMPP.
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280
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281 Further, known Prosody roles can be used as scopes.
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282
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283 OpenID scopes such as `openid` and `profile` can be used for "Login
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284 with XMPP" without granting access to more than limited profile details.
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285
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286 ## Compatibility
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287
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288 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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289 earlier.