annotate mod_http_oauth2/README.markdown @ 5447:aa4828f040c5

mod_http_oauth2: Enforce client scope restrictions in authorization When registering a client, a scope field can be included as a promise to only ever use those. Here we enforce that promise, if given, ensuring a client can't request or be granted a scope it didn't provide in its registration. While currently there is no restrictions at registration time, this could be changed in the future in various ways.
author Kim Alvefur <zash@zash.se>
date Thu, 11 May 2023 19:33:44 +0200
parents 2393dbae51ed
children 2a11f590c5c8
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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 7628: A Set of Simple Authentication and Security Layer (SASL) Mechanisms for OAuth](https://www.rfc-editor.org/rfc/rfc7628)
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50 - [RFC 7636: Proof Key for Code Exchange by OAuth Public Clients](https://www.rfc-editor.org/rfc/rfc7636)
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51 - [OpenID Connect Core 1.0](https://openid.net/specs/openid-connect-core-1_0.html)
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52 - [OpenID Connect Dynamic Client Registration 1.0](https://openid.net/specs/openid-connect-registration-1_0.html) & [RFC 7591: OAuth 2.0 Dynamic Client Registration](https://www.rfc-editor.org/rfc/rfc7591.html)
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53 - [OpenID Connect Discovery 1.0](https://openid.net/specs/openid-connect-discovery-1_0.html)
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54
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55 ## Configuration
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56
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57 ### Interface
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58
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59 The module presents a web page to users to allow them to authenticate when
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60 a client requests access. Built-in pages are provided, but you may also theme
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61 or entirely override them.
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62
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63 This module honours the 'site_name' configuration option that is also used by
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64 a number of other modules:
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65
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66 ```lua
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67 site_name = "My XMPP Server"
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68 ```
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69
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70 To provide custom templates, specify the path to the template directory:
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71
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72 ```lua
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73 oauth2_template_path = "/etc/prosody/custom-oauth2-templates"
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74 ```
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75
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76 Some templates support additional variables, that can be provided by the
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77 'oauth2_template_style' option:
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79 ```lua
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80 oauth2_template_style = {
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81 background_colour = "#ffffff";
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82 }
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83 ```
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84
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85 ### Token parameters
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86
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87 The following options configure the lifetime of tokens issued by the module.
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88 The defaults are recommended.
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89
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90 ```lua
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91 oauth2_access_token_ttl = 86400 -- 24 hours
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92 oauth2_refresh_token_ttl = nil -- unlimited unless revoked by the user
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93 ```
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94
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95 ### Dynamic client registration
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96
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97 To allow users to connect any compatible software, you should enable dynamic
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98 client registration.
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99
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100 Dynamic client registration can be enabled by configuring a JWT key. Algorithm
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101 defaults to *HS256* lifetime defaults to forever.
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102
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103 ```lua
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104 oauth2_registration_key = "securely generated JWT key here"
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105 oauth2_registration_algorithm = "HS256"
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106 oauth2_registration_ttl = nil -- unlimited by default
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107 ```
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108
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109 ### Supported flows
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110
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111 Various flows can be disabled and enabled with
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112 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`:
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113
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114 ```lua
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115 allowed_oauth2_grant_types = {
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116 "authorization_code"; -- authorization code grant
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117 "password"; -- resource owner password grant
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118 }
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119
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120 allowed_oauth2_response_types = {
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121 "code"; -- authorization code flow
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122 -- "token"; -- implicit flow disabled by default
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123 }
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124 ```
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125
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126 The [Proof Key for Code Exchange][RFC 7636] mitigation method can be
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127 made required:
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128
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129 ```lua
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130 oauth2_require_code_challenge = true
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131 ```
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132
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133 Further, individual challenge methods can be enabled or disabled:
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134
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135 ```lua
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136 allowed_oauth2_code_challenge_methods = {
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137 "plain"; -- the insecure one
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138 "S256";
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139 }
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140 ```
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141
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142 ### Policy documents
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143
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144 Links to Terms of Service and Service Policy documents can be advertised
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145 for use by OAuth clients:
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146
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147 ```lua
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148 oauth2_terms_url = "https://example.com/terms-of-service.html"
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149 oauth2_policy_url = "https://example.com/service-policy.pdf"
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150 ```
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151
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152 ## Deployment notes
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153
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154 ### Access management
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155
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156 This module does not provide an interface for users to manage what they have
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157 granted access to their account! (e.g. to view and revoke clients they have
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158 previously authorized). It is recommended to join this module with
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159 mod_client_management to provide such access. However, at the time of writing,
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160 no XMPP clients currently support the protocol used by that module. We plan to
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161 work on additional interfaces in the future.
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162
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163 ### Scopes
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164
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165 OAuth supports "scopes" as a way to grant clients limited access.
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166
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167 There are currently no standard scopes defined for XMPP. This is something
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168 that we intend to change, e.g. by definitions provided in a future XEP. This
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169 means that clients you authorize currently have unrestricted access to your
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170 account (including the ability to change your password and lock you out!). So,
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171 for now, while using OAuth clients can prevent leaking your password to them,
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172 it is not currently suitable for connecting untrusted clients to your account.
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173
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174 ## Compatibility
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175
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176 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or
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177 earlier.