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DSL-AshAuthentication.Strategy.Oidc.md

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DSL: AshAuthentication.Strategy.Oidc

Strategy for authentication using an OpenID Connect compatible server as the source of truth.

This strategy builds on-top of AshAuthentication.Strategy.OAuth2 and assent.

In order to use OIDC you need to provide the following minimum configuration:

  • client_id - The client id, required
  • site - The OIDC issuer, required
  • openid_configuration_uri - The URI for OpenID Provider, optional, defaults to /.well-known/openid-configuration
  • client_authentication_method - The Client Authentication method to use, optional, defaults to client_secret_basic
  • client_secret - The client secret, required if :client_authentication_method is :client_secret_basic, :client_secret_post, or :client_secret_jwt
  • openid_configuration - The OpenID configuration, optional, the configuration will be fetched from :openid_configuration_uri if this is not defined
  • id_token_signed_response_alg - The id_token_signed_response_alg parameter sent by the Client during Registration, defaults to RS256
  • id_token_ttl_seconds - The number of seconds from iat that an ID Token will be considered valid, optional, defaults to nil
  • nonce - The nonce to use for authorization request, optional, MUST be session based and unguessable.

Nonce

nonce can be set in the provider config. The nonce will be returned in the session_params along with state. You can use this to store the value in the current session e.g. a httpOnly session cookie.

A random value generator can look like this:

16
|> :crypto.strong_rand_bytes()
|> Base.encode64(padding: false)

AshAuthentication will dynamically generate one for the session if nonce is set to true.

More documentation:

authentication.strategies.oidc

oidc name \\ :oidc

Provides an OpenID Connect authentication strategy.

This strategy is built using the :oauth2 strategy, and thus provides all the same configuration options should you need them.

More documentation:

Arguments

Name Type Default Docs
name{: #authentication-strategies-oidc-name .spark-required} atom Uniquely identifies the strategy.

Options

Name Type Default Docs
client_id{: #authentication-strategies-oidc-client_id .spark-required} (any, any -> any) | module | String.t The OAuth2 client ID. Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
base_url{: #authentication-strategies-oidc-base_url .spark-required} (any, any -> any) | module | String.t The base URL of the OAuth2 server - including the leading protocol (ie https://). Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
redirect_uri{: #authentication-strategies-oidc-redirect_uri .spark-required} (any, any -> any) | module | String.t The callback URI base. Not the whole URI back to the callback endpoint, but the URI to your AuthPlug. Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
site{: #authentication-strategies-oidc-site } (any, any -> any) | module | String.t Deprecated: Use base_url instead.
prevent_hijacking?{: #authentication-strategies-oidc-prevent_hijacking? } boolean true Requires a confirmation add_on to be present if the password strategy is used with the same identity_field.
auth_method{: #authentication-strategies-oidc-auth_method } nil | :client_secret_basic | :client_secret_post | :client_secret_jwt | :private_key_jwt :client_secret_post The authentication strategy used, optional. If not set, no authentication will be used during the access token request.
client_secret{: #authentication-strategies-oidc-client_secret } (any, any -> any) | module | String.t The OAuth2 client secret. Required if :auth_method is :client_secret_basic, :client_secret_post or :client_secret_jwt. Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
trusted_audiences{: #authentication-strategies-oidc-trusted_audiences } (any, any -> any) | module | list(any) | nil A list of audiences which are trusted. Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
private_key{: #authentication-strategies-oidc-private_key } (any, any -> any) | module | String.t The private key to use if :auth_method is :private_key_jwt. Takes either a module which implements the AshAuthentication.Secret behaviour, a 2 arity anonymous function or a string.
authorization_params{: #authentication-strategies-oidc-authorization_params } keyword [] Any additional parameters to encode in the request phase. eg: authorization_params scope: "openid profile email"
registration_enabled?{: #authentication-strategies-oidc-registration_enabled? } boolean true If enabled, new users will be able to register for your site when authenticating and not already present. If not, only existing users will be able to authenticate.
register_action_name{: #authentication-strategies-oidc-register_action_name } atom The name of the action to use to register a user, if registration_enabled? is true. Defaults to register_with_<name> See the "Registration and Sign-in" section of the strategy docs for more.
sign_in_action_name{: #authentication-strategies-oidc-sign_in_action_name } atom The name of the action to use to sign in an existing user, if sign_in_enabled? is true. Defaults to sign_in_with_<strategy>, which is generated for you by default. See the "Registration and Sign-in" section of the strategy docs for more information.
identity_resource{: #authentication-strategies-oidc-identity_resource } module | false false The resource used to store user identities, or false to disable. See the User Identities section of the strategy docs for more.
identity_relationship_name{: #authentication-strategies-oidc-identity_relationship_name } atom :identities Name of the relationship to the provider identities resource
identity_relationship_user_id_attribute{: #authentication-strategies-oidc-identity_relationship_user_id_attribute } atom :user_id The name of the destination (user_id) attribute on your provider identity resource. Only necessary if you've changed the user_id_attribute_name option of the provider identity.
openid_configuration_uri{: #authentication-strategies-oidc-openid_configuration_uri } String.t "/.well-known/openid-configuration" The URI for the OpenID provider
client_authentication_method{: #authentication-strategies-oidc-client_authentication_method } "client_secret_basic" | "client_secret_post" | "client_secret_jwt" | "private_key_jwt" "client_secret_basic" The client authentication method to use.
openid_configuration{: #authentication-strategies-oidc-openid_configuration } map %{} The OpenID configuration. If not set, the configuration will be retrieved from openid_configuration_uri.
id_token_signed_response_alg{: #authentication-strategies-oidc-id_token_signed_response_alg } "HS256" | "HS384" | "HS512" | "RS256" | "RS384" | "RS512" | "ES256" | "ES384" | "ES512" | "PS256" | "PS384" | "PS512" | "Ed25519" | "Ed25519ph" | "Ed448" | "Ed448ph" | "EdDSA" "RS256" The id_token_signed_response_alg parameter sent by the Client during Registration.
id_token_ttl_seconds{: #authentication-strategies-oidc-id_token_ttl_seconds } nil | pos_integer The number of seconds from iat that an ID Token will be considered valid.
nonce{: #authentication-strategies-oidc-nonce } boolean | (any, any -> any) | module | String.t true A function for generating the session nonce, true to automatically generate it with AshAuthentication.Strategy.Oidc.NonceGenerator, or false to disable.

Introspection

Target: AshAuthentication.Strategy.OAuth2

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