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mod_http_oauth2: Link to RFC 7009: OAuth 2.0 Token Revocation
author Kim Alvefur <zash@zash.se>
date Tue, 02 May 2023 19:06:17 +0200
parents ac9710126e1a
children 92ad8f03f225
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1 ---
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2 summary: Authenticate against an external OAuth 2 IdP
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3 labels:
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4 - Stage-Alpha
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5 ---
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6
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7 This module provides external authentication via an external [AOuth
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8 2](https://datatracker.ietf.org/doc/html/rfc7628) authorization server
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9 and supports the [SASL OAUTHBEARER authentication][rfc7628]
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10 mechanism as well as PLAIN for legacy clients (this is all of them).
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11
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12 # How it works
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13
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14 Clients retrieve tokens somehow, then show them to Prosody, which asks
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15 the Authorization server to validate them, returning info about the user
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16 back to Prosody.
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17
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18 Alternatively for legacy clients, Prosody receives the users username
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19 and password and retrieves a token itself, then proceeds as above.
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20
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21 # Configuration
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22
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23 ## Example
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24
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25 ```lua
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26 -- authentication = "oauth_external"
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27
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28 oauth_external_discovery_url = "https//auth.example.com/auth/realms/TheRealm/.well-known/openid-configuration"
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29 oauth_external_token_endpoint = "https//auth.example.com/auth/realms/TheRealm/protocol/openid-connect/token"
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30 oauth_external_validation_endpoint = "https//auth.example.com/auth/realms/TheRealm/protocol/openid-connect/userinfo"
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31 oauth_external_username_field = "xmpp_username"
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32 ```
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33
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34
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35 ## Common
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36
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37 `oauth_external_issuer`
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38 : Optional URL string representing the Authorization server identity.
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39
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40 `oauth_external_discovery_url`
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41 : Optional URL string pointing to [OAuth 2.0 Authorization Server
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42 Metadata](https://oauth.net/2/authorization-server-metadata/). Lets
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43 clients discover where they should retrieve access tokens from if
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44 they don't have one yet. Default based on `oauth_external_issuer` is
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45 set, otherwise empty.
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46
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47 `oauth_external_validation_endpoint`
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48 : URL string. The token validation endpoint, should validate the token
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49 and return a JSON structure containing the username of the user
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50 logging in the field specified by `oauth_external_username_field`.
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51 Commonly the [OpenID `UserInfo`
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52 endpoint](https://openid.net/specs/openid-connect-core-1_0.html#UserInfo)
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53
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54 `oauth_external_username_field`
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55 : String. Default is `"preferred_username"`. Field in the JSON
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56 structure returned by the validation endpoint that contains the XMPP
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57 localpart.
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58
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59 ## For SASL PLAIN
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60
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61 `oauth_external_resource_owner_password`
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62 : Boolean. Defaults to `true`. Whether to allow the *insecure*
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63 [resource owner password
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64 grant](https://oauth.net/2/grant-types/password/) and SASL PLAIN.
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65
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66 `oauth_external_token_endpoint`
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67 : URL string. OAuth 2 [Token
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68 Endpoint](https://www.rfc-editor.org/rfc/rfc6749#section-3.2) used
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69 to retrieve token in order to then retrieve the username.
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70
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71 `oauth_external_client_id`
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72 : String. Client ID used to identify Prosody during the resource owner
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73 password grant.
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74
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75 # Compatibility
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76
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77 ## Prosody
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78
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79 Version Status
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80 --------- ---------------
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81 trunk works
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82 0.12.x does not work
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83 0.11.x does not work
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84
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85 ## Identity Provider
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86
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87 Tested with
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88
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89 - [KeyCloak](https://www.keycloak.org/)
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90
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91 # Future work
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92
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93 - Automatically discover endpoints from Discovery URL
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94 - Configurable input username mapping (e.g. user → user@host).
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95 - [SCRAM over HTTP?!][rfc7804]