Mercurial > prosody-modules
annotate mod_http_oauth2/README.markdown @ 5548:fd3c12c40cd9
mod_http_oauth2: Disable CORS for authorization endpoint
Per recommendation in draft-ietf-oauth-security-topics-23
Hopefully it is enough to return an error status, since mod_http will
add CORS headers from a handler with higher priority, even for OPTIONS.
author | Kim Alvefur <zash@zash.se> |
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date | Fri, 16 Jun 2023 00:05:57 +0200 |
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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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28 |
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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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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`: |
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135 |
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136 `web` |
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137 : `redirect_uris` **MUST** be `https://` URIs and **MUST** use the |
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138 same hostname part as the `client_uri`. |
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139 |
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140 `native` |
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141 |
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142 : `redirect_uris` **MUST** 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 `application_type` |
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150 |
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151 : Optional, defaults to `web`. Determines further restrictions for |
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152 `redirect_uris`. The following values are supported: |
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153 |
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154 `web` *(default)* |
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155 : For web clients. |
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156 |
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157 `native` |
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158 : For native e.g. desktop clients etc. |
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159 |
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160 `tos_uri`, `policy_uri` |
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161 : Informative URLs pointing to Terms of Service and Service Policy |
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162 document **MUST** use the same scheme (i.e. `https://`) and hostname |
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163 as the `client_uri`. |
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164 |
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165 #### Registration Example |
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166 |
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167 In short registration works by POST-ing a JSON structure describing your |
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168 client to an endpoint: |
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169 |
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170 ``` bash |
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171 curl -sSf https://xmpp.example.net/oauth2/register \ |
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172 -H Content-Type:application/json \ |
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173 -H Accept:application/json \ |
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174 --data ' |
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175 { |
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176 "client_name" : "My Application", |
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177 "client_uri" : "https://app.example.com/", |
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178 "redirect_uris" : [ |
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179 "https://app.example.com/redirect" |
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180 ] |
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181 } |
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182 ' |
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183 ``` |
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184 |
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185 ### Supported flows |
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186 |
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187 - Authorization Code grant, optionally with Proof Key for Code Exchange |
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188 - Resource owner password grant |
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189 - Implicit flow *(disabled by default)* |
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190 - Refresh Token grants |
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191 |
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192 Various flows can be disabled and enabled with |
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193 `allowed_oauth2_grant_types` and `allowed_oauth2_response_types`: |
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194 |
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195 ```lua |
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196 -- These examples reflect the defaults |
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197 allowed_oauth2_grant_types = { |
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198 "authorization_code"; -- authorization code grant |
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199 "password"; -- resource owner password grant |
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200 } |
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201 |
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202 allowed_oauth2_response_types = { |
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203 "code"; -- authorization code flow |
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204 -- "token"; -- implicit flow disabled by default |
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205 } |
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206 ``` |
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207 |
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208 The [Proof Key for Code Exchange][RFC 7636] mitigation method is |
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209 optional by default but can be made required: |
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210 |
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211 ```lua |
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212 oauth2_require_code_challenge = true -- default is false |
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213 ``` |
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214 |
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215 Further, individual challenge methods can be enabled or disabled: |
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216 |
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217 ```lua |
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218 -- These reflects the default |
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219 allowed_oauth2_code_challenge_methods = { |
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220 "plain"; -- the insecure one |
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221 "S256"; |
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222 } |
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223 ``` |
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224 |
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225 ### Policy documents |
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226 |
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227 Links to Terms of Service and Service Policy documents can be advertised |
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228 for use by OAuth clients: |
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229 |
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230 ```lua |
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231 oauth2_terms_url = "https://example.com/terms-of-service.html" |
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232 oauth2_policy_url = "https://example.com/service-policy.pdf" |
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233 -- These are unset by default |
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234 ``` |
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235 |
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236 ## Deployment notes |
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237 |
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238 ### Access management |
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239 |
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240 This module does not provide an interface for users to manage what they have |
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241 granted access to their account! (e.g. to view and revoke clients they have |
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242 previously authorized). It is recommended to join this module with |
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243 [mod_client_management] to provide such access. However, at the time of writing, |
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244 no XMPP clients currently support the protocol used by that module. We plan to |
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245 work on additional interfaces in the future. |
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246 |
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247 ### Scopes |
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248 |
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249 OAuth supports "scopes" as a way to grant clients limited access. |
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250 |
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251 There are currently no standard scopes defined for XMPP. This is |
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252 something that we intend to change, e.g. by definitions provided in a |
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253 future XEP. This means that clients you authorize currently have to |
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254 choose between unrestricted access to your account (including the |
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255 ability to change your password and lock you out!) and zero access. So, |
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256 for now, while using OAuth clients can prevent leaking your password to |
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257 them, it is not currently suitable for connecting untrusted clients to |
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258 your account. |
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259 |
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260 As a first step, the `xmpp` scope is supported, and corresponds to |
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261 whatever permissions the user would have when logged in over XMPP. |
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262 |
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263 Further, known Prosody roles can be used as scopes. |
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264 |
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265 OpenID scopes such as `openid` and `profile` can be used for "Login |
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266 with XMPP" without granting access to more than limited profile details. |
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267 |
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268 ## Compatibility |
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269 |
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270 Requires Prosody trunk (April 2023), **not** compatible with Prosody 0.12 or |
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271 earlier. |