OpenID Connect

Authelia can operate as an OpenID Connect provider. This section describes how to configure this.

Authelia currently supports the OpenID Connect OP role as a beta feature. The OP role is the OpenID Connect Provider role, not the Relying Party or RP role. This means other applications that implement the OpenID Connect RP role can use Authelia as an authentication and authorization backend similar to how you may use social media or development platforms for login.

The Relying Party role is the role which allows an application to use GitHub, Google, or other OpenID Connect providers for authentication and authorization. We do not intend to support this functionality at this moment in time.

More information about the beta can be found in the roadmap.

Configuration

The following snippet provides a sample-configuration for the OIDC identity provider explaining each field in detail.

identity_providers:
  oidc:
    hmac_secret: this_is_a_secret_abc123abc123abc
    issuer_private_key: |
      -----BEGIN RSA PRIVATE KEY-----
      MXIEogIB$AKCAQEAxZVJP3WF//PG2fLQoEC9DtdiFG/+00vqlbVzz47nyxKONIPI
      lmL3UdmqpGTKMe/5Brqse4ZAKlQHiDbwzK9ypnfigtHuvh/JO0S7ChP70RC67ed1
      HV1nyfz5eW3llbtGJPrlYLqITNgctHp6zmRUFtSzPj9qFvozI93LJi492yL1+vu8
      Un3Dm8+Qq6XM2tPdEcldB/dtBwOWoF+8eOOVsu0TDuB5bwlhBVGJuSAuzBPRS2bF
      Ga4uk0JDdkDOMCEQxC5uWDFxgfERSMFyfLVWD47woDbuWEBq10c0z+dpWPMp7Ain
      YnnkqicwCN88Z0zid6MmMQ65F4+9Hc+qC/p6xwIDAQABAoIBAGlhaAHKor+Su3o/
      AXqXTL5/rbYMzbLQiLt0XeJT69jpeqMTroZXHmWvXE3128mqnf0yzw/K2Ko6yxGh
      i+j/onya8FqpsVYCCgfsbn2/js1AyRJeIp6Y1ORsYnqbXJnxmkXa80AV/OBPW2/+
      60TtSdQrebY3iFPc+i2k+9bPTvpyyDLKlz8UwdZG+k5uyYNIyQTccz+PjwsIvDij
      7tKYamhhLN3QXt3/aZTFpjTgezP4WyriZxjWrddHowc47q2rwNS95ND39JcysJAc
      0Pcbu8A5lVa7Fx33uOtzDfKWIW7xVEN+OtPgN+FbTjXcXk5IZedl+pW5lU5P++G/
      ZPvz+WECgYEA9g6HwdODW3e68bOqsFoKg35+vfUFMzlyMF8HFylNVfnLpTEDr637
      owzMFvcUxVd71b+gV5nnnbI+riUFIgyR8vhCjhy4moopDPahC4/KwN4NG6uz+i1h
      AB6D5+zn2BjnO/5xMMFGlApWtRNmJVGYlNDj3bXKh2VXzzy03VNeD8kCgYEAzZFL
      OlzoRB1HKpTWIECcuvxofMxLOLb3zs0k2t/FYNYIpovmGWCCAULz13y53e5+/+5m
      7I9VUZJFaIhaZ36qVBApCKdru69pZMkWCcQO9jELFcx51Ez7OgJWzu7GS1QJCPKC
      fEDxI0rZK21j93/Sl/nUnEir7CYpQ+wvCaGuHg8CgYAXgbncfY1+DokwkB6NbHy2
      pT4Mfbz6cNGE538w6kQ2I4AeDvmwLentYMqaow478CinegAiflSPTzkHwAemghbr
      ZGZPV1UXhn13fJRUG2+eT1hnPVcbXnx223N0k8Bud6qXo65CnyRT/kzcTbcjd5Eh
      Hne2daicmMTzynPo9Q72aQKBgBmobO9X8VWvIdbaxO85oVZlctVA2pK1o7CYQmVf
      UM+JZ4MCKzI3rYJizPS0iK5+ujNPmmEkcs2/qBIoEsCgOrpLWhPOcc/3UPxXbPzD
      D+sCrBOIdhxdj23qJNOnUfDNCGOpgUfpAzAYg4q8GKInvi1h7XukRnEvQi9MJ4LY
      P1dZAoGASGcGnTMkmeSXP8ux+dvQJAiJskn/sJIgBZ5uq5GRCeLBUosRSVxM75UK
      vAh/c/RBj+pYXVKuPuHGZCQJxsdcRXzXNGouUtgbaYML5Me/Hagt20QzDRBfuGBg
      qeZBJaXhjElvw6PUWtg4x+LYRCBpq/bS3LK3ozZrSTukVkKDegw=
      -----END RSA PRIVATE KEY-----
    access_token_lifespan: 1h
    authorize_code_lifespan: 1m
    id_token_lifespan: 1h
    refresh_token_lifespan: 90m
    enable_client_debug_messages: false
    enforce_pkce: public_clients_only
    cors:
      endpoints:
        - authorization
        - token
        - revocation
        - introspection
      allowed_origins:
        - https://example.com
      allowed_origins_from_client_redirect_uris: false
    clients:
      - id: myapp
        description: My Application
        secret: this_is_a_secret
        sector_identifier: ''
        public: false
        authorization_policy: two_factor
        pre_configured_consent_duration: ''
        audience: []
        scopes:
          - openid
          - groups
          - email
          - profile
        redirect_uris:
          - https://oidc.example.com:8080/oauth2/callback
        grant_types:
          - refresh_token
          - authorization_code
        response_types:
          - code
        response_modes:
          - form_post
          - query
          - fragment
        userinfo_signing_algorithm: none

Options

hmac_secret

string required

Important Note: This can also be defined using a secret which is strongly recommended especially for containerized deployments.

The HMAC secret used to sign the JWT’s. The provided string is hashed to a SHA256 (RFC6234) byte string for the purpose of meeting the required format.

It’s strongly recommended this is a Random Alphanumeric String with 64 or more characters.

issuer_private_key

string required

Important Note: This can also be defined using a secret which is strongly recommended especially for containerized deployments.

The private key in DER base64 (RFC4648) encoded PEM format used to encrypt the OpenID Connect JWT’s. The key must be generated by the administrator and can be done by following the Generating an RSA Keypair guide.

access_token_lifespan

duration 1h not required

The maximum lifetime of an access token. It’s generally recommended keeping this short similar to the default. For more information read these docs about token lifespan.

authorize_code_lifespan

duration 1m not required

The maximum lifetime of an authorize code. This can be rather short, as the authorize code should only be needed to obtain the other token types. For more information read these docs about token lifespan.

id_token_lifespan

duration 1h not required

The maximum lifetime of an ID token. For more information read these docs about token lifespan.

refresh_token_lifespan

string 90m not required

The maximum lifetime of a refresh token. The refresh token can be used to obtain new refresh tokens as well as access tokens or id tokens with an up-to-date expiration. For more information read these docs about token lifespan.

A good starting point is 50% more or 30 minutes more (which ever is less) time than the highest lifespan out of the access token lifespan, the authorize code lifespan, and the id token lifespan. For instance the default for all of these is 60 minutes, so the default refresh token lifespan is 90 minutes.

enable_client_debug_messages

boolean false not required

Allows additional debug messages to be sent to the clients.

minimum_parameter_entropy

integer 8 not required

This controls the minimum length of the nonce and state parameters.

Security Notice: Changing this value is generally discouraged, reducing it from the default can theoretically make certain scenarios less secure. It is highly encouraged that if your OpenID Connect RP does not send these parameters or sends parameters with a lower length than the default that they implement a change rather than changing this value.

enforce_pkce

string public_clients_only not required

Proof Key for Code Exchange enforcement policy: if specified, must be either never, public_clients_only or always.

If set to public_clients_only (default), PKCE will be required for public clients using the Authorization Code Flow.

When set to always, PKCE will be required for all clients using the Authorization Code flow.

Security Notice: Changing this value to never is generally discouraged, reducing it from the default can theoretically make certain client-side applications (mobile applications, SPA) vulnerable to CSRF and authorization code interception attacks.

enable_pkce_plain_challenge

boolean false not required

Allows PKCE plain challenges when set to true.

Security Notice: Changing this value is generally discouraged. Applications should use the S256 PKCE challenge method instead.

cors

Some OpenID Connect Endpoints need to allow cross-origin resource sharing, however some are optional. This section allows you to configure the optional parts. We reply with CORS headers when the request includes the Origin header.

endpoints

list(string) not required

A list of endpoints to configure with cross-origin resource sharing headers. It is recommended that the userinfo option is at least in this list. The potential endpoints which this can be enabled on are as follows:

  • authorization
  • token
  • revocation
  • introspection
  • userinfo

allowed_origins

list(string) not required

A list of permitted origins.

Any origin with https is permitted unless this option is configured or the allowed_origins_from_client_redirect_uris option is enabled. This means you must configure this option manually if you want http endpoints to be permitted to make cross-origin requests to the OpenID Connect endpoints, however this is not recommended.

Origins must only have the scheme, hostname and port, they may not have a trailing slash or path.

In addition to an Origin URI, you may specify the wildcard origin in the allowed_origins. It MUST be specified by itself and the allowed_origins_from_client_redirect_uris MUST NOT be enabled. The wildcard origin is denoted as *. Examples:

identity_providers:
  oidc:
    cors:
      allowed_origins: "*"
identity_providers:
  oidc:
    cors:
      allowed_origins:
        - "*"

allowed_origins_from_client_redirect_uris

boolean false not required

Automatically adds the origin portion of all redirect URI’s on all clients to the list of allowed_origins, provided they have the scheme http or https and do not have the hostname of localhost.

clients

list required

A list of clients to configure. The options for each client are described below.

id

string required

The Client ID for this client. It must exactly match the Client ID configured in the application consuming this client.

description

string *same as id* not required

A friendly description for this client shown in the UI. This defaults to the same as the ID.

secret

string situational

The shared secret between Authelia and the application consuming this client. This secret must match the secret configured in the application. Currently this is stored in plain text.

This secret must be generated by the administrator and can be done by following the Generating a Random Alphanumeric String guide.

This must be provided when the client is a confidential client type, and must be blank when using the public client type. To set the client type to public see the public configuration option.

sector_identifier

string not required

Important Note: because adjusting this option will inevitably change the sub claim of all tokens generated for the specified client, changing this should cause the relying party to detect all future authorizations as completely new users.

Must be an empty string or the host component of a URL. This is commonly just the domain name, but may also include a port.

Authelia utilizes UUID version 4 subject identifiers. By default the public Subject Identifier Type is utilized for all clients. This means the subject identifiers will be the same for all clients. This configuration option enables Pairwise Identifier Algorithm for this client, and configures the sector identifier utilized for both the storage and the lookup of the subject identifier.

  1. All clients who do not have this configured will generate the same subject identifier for a particular user regardless of which client obtains the ID token.
  2. All clients which have the same sector identifier will:
    1. have the same subject identifier for a particular user when compared to clients with the same sector identifier.
    2. have a completely different subject identifier for a particular user whe compared to:
      1. any client with the public subject identifier type.
      2. any client with a differing sector identifier.

In specific but limited scenarios this option is beneficial for privacy reasons. In particular this is useful when the party utilizing the Authelia OpenID Connect Authorization Server is foreign and not controlled by the user. It would prevent the third party utilizing the subject identifier with another third party in order to track the user.

Keep in mind depending on the other claims they may still be able to perform this tracking and it is not a silver bullet. There are very few benefits when utilizing this in a homelab or business where no third party is utilizing the server.

public

bool false not required

This enables the public client type for this client. This is for clients that are not capable of maintaining confidentiality of credentials, you can read more about client types in RFC6749 Section 2.1. This is particularly useful for SPA’s and CLI tools. This option requires setting the client secret to a blank string.

In addition to the standard rules for redirect URIs, public clients can use the urn:ietf:wg:oauth:2.0:oob redirect URI.

authorization_policy

string two_factor not required

The authorization policy for this client: either one_factor or two_factor.

duration not required

Note: This setting uses the duration notation format. Please see the common options documentation for information on this format.

Configuring this enables users of this client to remember their consent as a pre-configured consent. The period of time dictates how long a users choice to remember the pre-configured consent lasts.

Pre-configured consents are only valid if the subject, client id are exactly the same and the requested scopes/audience match exactly with the granted scopes/audience.

audience

list(string) not required

A list of audiences this client is allowed to request.

scopes

list(string) openid, groups, profile, email not required

A list of scopes to allow this client to consume. See scope definitions for more information. The documentation for the application you want to use with Authelia will most-likely provide you with the scopes to allow.

redirect_uris

list(string) required

A list of valid callback URIs this client will redirect to. All other callbacks will be considered unsafe. The URIs are case-sensitive and they differ from application to application - the community has provided a list of URL´s for common applications.

Some restrictions that have been placed on clients and their redirect URIs are as follows:

  1. If a client attempts to authorize with Authelia and its redirect URI is not listed in the client configuration the attempt to authorize wil fail and an error will be generated.
  2. The redirect URIs are case-sensitive.
  3. The URI must include a scheme and that scheme must be one of http or https.
  4. The client can ignore rule 3 and use urn:ietf:wg:oauth:2.0:oob if it is a public client type.

grant_types

list(string) refresh_token, authorization_code not required

A list of grant types this client can return. It is recommended that this isn’t configured at this time unless you know what you’re doing. Valid options are: implicit, refresh_token, authorization_code, password, client_credentials.

response_types

list(string) code not required

A list of response types this client can return. It is recommended that this isn’t configured at this time unless you know what you’re doing. Valid options are: code, code id_token, id_token, token id_token, token, token id_token code.

response_modes

list(string) form_post, query, fragment not required

A list of response modes this client can return. It is recommended that this isn’t configured at this time unless you know what you’re doing. Potential values are form_post, query, and fragment.

userinfo_signing_algorithm

string none not required

The algorithm used to sign the userinfo endpoint responses. This can either be none or RS256.

Integration

To integrate Authelia’s OpenID Connect implementation with a relying party please see the integration docs.