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mod_auth_oauth_external: Linkify password grant
author Kim Alvefur <zash@zash.se>
date Sat, 15 Apr 2023 10:46:04 +0200
parents a0074038696f
children ac9710126e1a
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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 `oauth_external_issuer`
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24 : Optional URL string representing the Authorization server identity.
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25
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26 `oauth_external_discovery_url`
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27 : Optional URL string pointing to [OAuth 2.0 Authorization Server
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28 Metadata](https://oauth.net/2/authorization-server-metadata/). Lets
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29 clients discover where they should retrieve access tokens from if
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30 they don't have one yet. Default based on `oauth_external_issuer` is
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31 set, otherwise empty.
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32
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33 `oauth_external_validation_endpoint`
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34 : URL string. The token validation endpoint, should validate the token
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35 and return a JSON structure containing the username of the user
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36 logging in the field specified by `oauth_external_username_field`.
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37 Commonly the [OpenID `UserInfo`
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38 endpoint](https://openid.net/specs/openid-connect-core-1_0.html#UserInfo)
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39
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40 `oauth_external_username_field`
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41 : String. Default is `"preferred_username"`. Field in the JSON
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42 structure returned by the validation endpoint that contains the XMPP
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43 localpart.
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44
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45 ## For SASL PLAIN
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46
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47 `oauth_external_resource_owner_password`
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48 : Boolean. Defaults to `true`. Whether to allow the *insecure*
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49 [resource owner password
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50 grant](https://oauth.net/2/grant-types/password/) and SASL PLAIN.
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51
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52 `oauth_external_token_endpoint`
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53 : URL string. OAuth 2 [Token
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54 Endpoint](https://www.rfc-editor.org/rfc/rfc6749#section-3.2) used
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55 to retrieve token in order to then retrieve the username.
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56
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57 `oauth_external_client_id`
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58 : String. Client ID used to identify Prosody during the resource owner
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59 password grant.
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60
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61 # Compatibility
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62
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63 ## Prosody
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64
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65 Version Status
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66 --------- ---------------
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67 trunk works
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68 0.12.x does not work
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69 0.11.x does not work
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70
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71 ## Identity Provider
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72
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73 Tested with
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74
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75 - [KeyCloak](https://www.keycloak.org/)
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76
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77 # Future work
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78
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79 - Automatically discover endpoints from Discovery URL
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80 - Configurable input username mapping (e.g. user → user@host).
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81 - [SCRAM over HTTP?!][rfc7804]