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mod_http_oauth2/README.markdown

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mod_http_oauth2/README.markdown @ 5416:2393dbae51ed

mod_http_oauth2: Add option for specifying TTL of registered clients Meant to simplify configuration, since TTL vs ignoring expiration is expected to be the main thing one would want to configure. Unsure what the implications of having unlimited lifetime of clients are, given no way to revoke them currently, short of rotating the signing secret. On one hand, it would be annoying to have the client expire. On the other hand, it is trivial to re-register it.
author Kim Alvefur <zash@zash.se>
date Thu, 04 May 2023 18:41:33 +0200
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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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78
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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.