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default OpenID Connect Identity Providers Configuration 2

OpenID Connect

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: |
      --- KEY START
      --- KEY END      
    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
        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

type: string {: .label .label-config .label-purple } required: yes {: .label .label-config .label-red }

The HMAC secret used to sign the OpenID Connect JWT's. The provided string is hashed to a SHA256 byte string for the purpose of meeting the required format. You must generate this option yourself.

Should be defined using a secret which is the recommended for containerized deployments.

issuer_private_key

type: string {: .label .label-config .label-purple } required: yes {: .label .label-config .label-red }

The private key in DER base64 encoded PEM format used to encrypt the OpenID Connect JWT's.¹ You must generate this option yourself. To create this option, use docker run -u "$(id -u):$(id -g)" -v "$(pwd)":/keys authelia/authelia:latest authelia rsa generate --dir /keys to generate both the private and public key in the current directory. You can then paste the private key into your configuration.

Should be defined using a secret which is the recommended for containerized deployments.

access_token_lifespan

type: duration {: .label .label-config .label-purple } default: 1h {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: duration {: .label .label-config .label-purple } default: 1m {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: duration {: .label .label-config .label-purple } default: 1h {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

refresh_token_lifespan

type: string {: .label .label-config .label-purple } default: 90m {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: boolean {: .label .label-config .label-purple } default: false {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

Allows additional debug messages to be sent to the clients.

minimum_parameter_entropy

type: integer {: .label .label-config .label-purple } default: 8 {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: string {: .label .label-config .label-purple } default: public_clients_only {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: boolean {: .label .label-config .label-purple } default: false {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: list(string) {: .label .label-config .label-purple } default: empty {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: list(string) {: .label .label-config .label-purple } default: empty {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: boolean {: .label .label-config .label-purple } default: false {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

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

id

type: string {: .label .label-config .label-purple } required: yes {: .label .label-config .label-red }

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

description

type: string {: .label .label-config .label-purple } default: *same as id* {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

secret

type: string {: .label .label-config .label-purple } required: situational {: .label .label-config .label-yellow }

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. You must generate this option yourself.

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

type: string {: .label .label-config .label-purple } default: '' {: .label .label-config .label-blue } required: no {: .label .label-config .label-red }

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 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

type: bool {: .label .label-config .label-purple } default: false {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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. 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

type: string {: .label .label-config .label-purple } default: two_factor {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

audience

type: list(string) {: .label .label-config .label-purple } required: no {: .label .label-config .label-green }

A list of audiences this client is allowed to request.

scopes

type: list(string) {: .label .label-config .label-purple } default: openid, groups, profile, email {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: list(string) {: .label .label-config .label-purple } required: yes {: .label .label-config .label-red }

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

type: list(string) {: .label .label-config .label-purple } default: refresh_token, authorization_code {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: list(string) {: .label .label-config .label-purple } default: code {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: list(string) {: .label .label-config .label-purple } default: form_post, query, fragment {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

type: string {: .label .label-config .label-purple } default: none {: .label .label-config .label-blue } required: no {: .label .label-config .label-green }

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

Generating a random secret

If you must provide a random secret in configuration, you can generate a random string of sufficient length. The command

LENGTH=64
tr -cd '[:alnum:]' < /dev/urandom | fold -w "${LENGTH}" | head -n 1 | tr -d '\n' ; echo

prints such a string with a length in characters of ${LENGTH} on stdout. The string will only contain alphanumeric characters. For Kubernetes, see this section too.

Scope Definitions

openid

This is the default scope for openid. This field is forced on every client by the configuration validation that Authelia does.

Important Note: The subject identifiers or sub claim has been changed to a RFC4122 UUID V4 to identify the individual user as per the Subject Identifier Types specification. Please use the claim preferred_username instead.

Claim JWT Type Authelia Attribute Description
sub string username A RFC4122 UUID V4 linked to the user who logged in
scope string scopes Granted scopes (space delimited)
scp array[string] scopes Granted scopes
iss string hostname The issuer name, determined by URL
at_hash string N/A Access Token Hash
aud array[string] N/A Audience
exp number N/A Expires
auth_time number N/A The time the user authenticated with Authelia
rat number N/A The time when the token was requested
iat number N/A The time when the token was issued
jti string(uuid) N/A A JWT Identifier in the form of a RFC4122 UUID V4
amr array[string] N/A An RFC8176 list of authentication method reference values

groups

This scope includes the groups the authentication backend reports the user is a member of in the token.

Claim JWT Type Authelia Attribute Description
groups array[string] groups List of user's groups discovered via authentication

email

This scope includes the email information the authentication backend reports about the user in the token.

Claim JWT Type Authelia Attribute Description
email string email[0] The first email address in the list of emails
email_verified bool N/A If the email is verified, assumed true for the time being
alt_emails array[string] email[1:] All email addresses that are not in the email JWT field

profile

This scope includes the profile information the authentication backend reports about the user in the token.

Claim JWT Type Authelia Attribute Description
preferred_username string username The username the user used to login with
name string display_name The users display name

Authentication Method References

Authelia currently supports adding the amr claim to the ID Token utilizing the RFC8176 Authentication Method Reference values.

The values this claim has are not strictly defined by the OpenID Connect specification. As such, some backends may expect a specification other than RFC8176 for this purpose. If you have such an application and wish for us to support it then you're encouraged to create an issue.

Below is a list of the potential values we place in the claim and their meaning:

Value Description Factor Channel
mfa User used multiple factors to login (see factor column) N/A N/A
mca User used multiple channels to login (see channel column) N/A N/A
user User confirmed they were present when using their hardware key N/A N/A
pin User confirmed they are the owner of the hardware key with a pin N/A N/A
pwd User used a username and password to login Know Browser
otp User used TOTP to login Have Browser
hwk User used a hardware key to login Have Browser
sms User used Duo to login Have External

Endpoint Implementations

The following section documents the endpoints we implement and their respective paths. This information can traditionally be discovered by relying parties that utilize discovery, however this information may be useful for clients which do not implement this.

The endpoints can be discovered easily by visiting the Discovery and Metadata endpoints. It is recommended regardless of your version of Authelia that you utilize this version as it will always produce the correct endpoint URLs. The paths for the Discovery/Metadata endpoints are part of IANA's well known registration but are also documented in a table below.

These tables document the endpoints we currently support and their paths in the most recent version of Authelia. The paths are appended to the end of the primary URL used to access Authelia. The tables use the url https://auth.example.com as an example of the Authelia root URL which is also the OpenID Connect issuer.

Well Known Discovery Endpoints

These endpoints can be utilized to discover other endpoints and metadata about the Authelia OP.

Endpoint Path
OpenID Connect Discovery https://auth.example.com/.well-known/openid-configuration
OAuth 2.0 Authorization Server Metadata https://auth.example.com/.well-known/oauth-authorization-server

Discoverable Endpoints

These endpoints implement OpenID Connect elements.

Endpoint Path Discovery Attribute
JSON Web Key Sets https://auth.example.com/jwks.json jwks_uri
Authorization https://auth.example.com/api/oidc/authorization authorization_endpoint
Token https://auth.example.com/api/oidc/token token_endpoint
Userinfo https://auth.example.com/api/oidc/userinfo userinfo_endpoint
Introspection https://auth.example.com/api/oidc/introspection introspection_endpoint
Revocation https://auth.example.com/api/oidc/revocation revocation_endpoint