annotate mod_http_oauth2/README.markdown @ 5502:fd4d89a5b8db

mod_http_oauth2: Add provisions for dynamically adding simple scopes This lets additional modules define what scopes they might add to the userinfo endpoint, or other things.
author Kim Alvefur <zash@zash.se>
date Thu, 01 Jun 2023 18:16:13 +0200
parents 1bcf755c7bae
children efe9e741f222
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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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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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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` and `client_uri` **MUST** be present.
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117 - `client_uri` **MUST** be a `https://` URL.
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118 - `redirect_uris` **MUST** contain at least one valid URI.
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119 - If `application_type` equals `web` (or is not included) then all
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120 `redirect_uris` **MUST** be `https://` URIs and **MUST** use the
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121 same hostname part as the `client_uri`.
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122 - If `application_type` equals `native` then all `redirect_uris`
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123 **MUST** match one of:
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124 - Loopback `http://` URI, e.g. `https://127.0.0.1:8080/`
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125 - Application-specific scheme, e.g. `com.example.app:/`
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126 - The special OOB URI `urn:ietf:wg:oauth:2.0:oob`
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127 - Informative URIs such as policy and terms of service **MUST** use
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128 the same scheme (i.e. `https://`) and hostname as the `client_uri`.
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129
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130 #### Registration Example
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131
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132 In short registration works by POST-ing a JSON structure describing your
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133 client to an endpoint:
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134
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135 ``` bash
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136 curl -sSf https://xmpp.example.net/oauth2/register \
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137 -H Content-Type:application/json \
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138 -H Accept:application/json \
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139 --data '
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140 {
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141 "client_name" : "My Application",
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142 "client_uri" : "https://app.example.com/",
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143 "redirect_uris" : [
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144 "https://app.example.com/redirect"
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145 ]
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146 }
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147 '
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148 ```
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149
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150 ### Supported flows
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151
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152 Various flows can be disabled and enabled with
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153 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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154
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155 ```lua
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156 allowed_oauth2_grant_types = {
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157 "authorization_code"; -- authorization code grant
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158 "password"; -- resource owner password grant
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159 }
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160
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161 allowed_oauth2_response_types = {
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162 "code"; -- authorization code flow
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163 -- "token"; -- implicit flow disabled by default
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164 }
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165 ```
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166
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167 The [Proof Key for Code Exchange][RFC 7636] mitigation method can be
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168 made required:
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169
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170 ```lua
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171 oauth2_require_code_challenge = true
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172 ```
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173
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174 Further, individual challenge methods can be enabled or disabled:
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175
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176 ```lua
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177 allowed_oauth2_code_challenge_methods = {
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178 "plain"; -- the insecure one
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179 "S256";
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180 }
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181 ```
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182
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183 ### Policy documents
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184
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185 Links to Terms of Service and Service Policy documents can be advertised
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186 for use by OAuth clients:
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187
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188 ```lua
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189 oauth2_terms_url = "https://example.com/terms-of-service.html"
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190 oauth2_policy_url = "https://example.com/service-policy.pdf"
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191 ```
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192
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193 ## Deployment notes
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194
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195 ### Access management
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196
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197 This module does not provide an interface for users to manage what they have
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198 granted access to their account! (e.g. to view and revoke clients they have
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199 previously authorized). It is recommended to join this module with
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200 mod_client_management to provide such access. However, at the time of writing,
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201 no XMPP clients currently support the protocol used by that module. We plan to
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202 work on additional interfaces in the future.
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203
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204 ### Scopes
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205
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206 OAuth supports "scopes" as a way to grant clients limited access.
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207
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208 There are currently no standard scopes defined for XMPP. This is
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209 something that we intend to change, e.g. by definitions provided in a
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210 future XEP. This means that clients you authorize currently have to
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211 choose between unrestricted access to your account (including the
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212 ability to change your password and lock you out!) and zero access. So,
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213 for now, while using OAuth clients can prevent leaking your password to
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214 them, it is not currently suitable for connecting untrusted clients to
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215 your account.
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216
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217 As a first step, the `xmpp` scope is supported, and corresponds to
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218 whatever permissions the user would have when logged in over XMPP.
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219
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220 Further, known Prosody roles can be used as scopes.
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221
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222 OpenID scopes such as `openid` and `profile` can be used for "Login
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223 with XMPP" without granting access to more than limited profile details.
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224
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225 ## Compatibility
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226
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227 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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228 earlier.