Module oidc

Last modified 07 May 2024 11:15 +02:00
Since 4.5
This functionality is available since version 4.5.

OIDC authentication module supports authentication via Identity provider that supports OpenID connect.

OIDC Authentication module contains two different types of configuration:

  1. GUI with channel http://midpoint.evolveum.com/xml/ns/public/common/channels-3#user, that was defined by attribute client,

  2. REST with channel http://midpoint.evolveum.com/xml/ns/public/common/channels-3#rest, that was defined by attribute resourceServer.

Configuration for GUI

Configuration for GUI is provided via attribute client, that is type OidcClientAuthenticationModuleType. Client supports only grand type Authorization code. We need to configure client properties for client authentication and configuration of OpenID provider for provide identity for identification of midpoint focus.

Client contains following attributes:

Name Description Required Type

registrationId

Unique identifier of the client. RegistrationId is used in url path, so it has to contain only correct symbols.

true

String

clientId

OAuth 2.0 Client Identifier valid at the Authorization Server.

true

String

clientSecret

OAuth 2.0 Client Secret valid at the Authorization Server.

false

ProtectedStringType

clientAuthenticationMethod

Define client authentication method. Possible values is clientSecretBasic, clientSecretPost, clientSecretJwt and privateKeyJwt.

false

OidcClientAuthenticationMethodType

clientSigningAlgorithm

Required node group. Identifier of algorithm for digitally sign or create a MAC of the content. (RFC7518 section-3.1)

false

String

scope

OpenID Connect Clients use scope values as defined in 3.3 of OAuth 2.0 [RFC6749] to specify what access privileges are being requested for Access Tokens. Scope contains 'openid', so we don’t need set it. Scope is multivalue attribute, so please set every value of scope to separate tags.

false

String

clientName

Human friendly name of client.

false

String

nameOfUsernameAttribute

Name of attribute in response, which value define name of user in Midpoint. Default value is 'sub'.

false

String

openIdProvider

OpenID Provider.

false

OidcOpenIdProviderType

simpleProofKey

Key used for sign with privateKeyJwt. Choice simpleProofKey or keyStoreProofKey.

false

AbstractSimpleKeyType

keyStoreProofKey

Key from key store used for sign with privateKeyJwt. Choice simpleProofKey or keyStoreProofKey.

false

AbstractKeyStoreKeyType

AbstractSimpleKeyType

AbstractSimpleKeyType contains following attributes:

Name Description Required Type

privateKey

Private key.

true

ProtectedStringType

passphrase

Password.

true

ProtectedStringType

certificate

Certificate of key.

true

ProtectedStringType

AbstractKeyStoreKeyType

AbstractKeyStoreKeyType contains following attributes:

Name Description Required Type

keyStorePath

Path to KeyStore.

true

String

keyStorePassword

Password of KeyStore.

true

ProtectedStringType

keyAlias

Alias of private key in KeyStore.

true

ProtectedStringType

keyPassword

Password of private key with alias ‘keyAlias’ in KeyStore.

true

ProtectedStringType

OidcOpenIdProviderType

Definition for OpenID Provider. Possible attributes are:

Name Description Required Type

issuerUri

Issuer identifier uri for the OpenID Connect provider.

true

String

authorizationUri

Uri for the authorization endpoint.

false

String

tokenUri

Uri for the token endpoint.

false

String

userInfoUri

Uri for user info endpoint.

false

String

endSessionUri

Uri for logout endpoint.

false

String

jwkSetUri

Uri for JSON web key set endpoint. Available from midPoint 4.8.

false

String

Required attribute is only issuerUri, because midPoint gets configuration for all other URIs from 'issuerUri'/.well-known/openid-configuration. MidPoint can write error to log file that some from optional configuration URIs is null and required. This error we can see when 'issuerUri'/.well-known/openid-configuration is unavailable.

Examples

The following example shows a simple client secret based authentication against Keycloak.

What is needed to make it work:

  1. Installed Keycloak e.g. from the Docker image. In the following we assume it’s running on http://192.168.4.100:8080/

  2. Created client midpoint (in Keycloak), with client authentication turned on and our midPoint URL (e.g., http://localhost:8080/midpoint/*) set as "Valid redirect URI".

  3. A sample user (e.g. jack) created in Keycloak, with a password set.

  4. The same user created in midPoint, with no password, but some roles (e.g. End user) allowing them to log in.

Example of client configuration with client authentication using client secret
<securityPolicy>
    <authentication>
        <modules>
            ...
            <loginForm> (1)
                <identifier>loginForm</identifier>
            </loginForm>
            ...
            <oidc> (2)
                <identifier>gui-oidc</identifier>
                <client>
                    <registrationId>oidc-registration</registrationId> (3)
                    <clientId>midpoint</clientId> (4)
                    <clientSecret>
                        <t:clearValue>RwdBxRhOggkDCr321SzyGwkEVvRHd7g1</t:clearValue> (5)
                    </clientSecret>
                    <clientAuthenticationMethod>clientSecretBasic</clientAuthenticationMethod>
                    <nameOfUsernameAttribute>preferred_username</nameOfUsernameAttribute>
                    <openIdProvider>
                        <issuerUri>http://192.168.4.100:8080/realms/master</issuerUri> (6)
                    </openIdProvider>
                </client>
            </oidc>
            ...
        </modules>
        ...
        <sequence> (2)
            <identifier>gui-oidc</identifier>
            <channel>
                <channelId>http://midpoint.evolveum.com/xml/ns/public/common/channels-3#user</channelId>
                <default>true</default>
                <urlSuffix>gui-oidc</urlSuffix>
            </channel>
            <module>
                <identifier>gui-oidc</identifier>
            </module>
        </sequence>
        ...
        <sequence> (1)
            <identifier>gui-login-form</identifier>
            <channel>
                <channelId>http://midpoint.evolveum.com/xml/ns/public/common/channels-3#user</channelId>
                <urlSuffix>gui-login-form</urlSuffix>
            </channel>
            <module>
                <identifier>loginForm</identifier>
            </module>
        </sequence>
        ...
    </authentication>
</securityPolicy>
1 To allow logging in for users that have no accounts in Keycloak (e.g., default midPoint administrator). Not strictly necessary.
2 OpenID Connect login for ordinary users.
3 Technical information that may be basically anything legal for inclusion into URI.
4 ID of the client as registered in Keycloak.
5 Secret of the client as generated by Keycloak (or provided manually).
6 URL at which Keycloak runs.

Administrator logs in at http://localhost:8080/midpoint/auth/gui-login-form. Ordinary users log in at http://localhost:8080/midpoint (the default authentication).

More advanced example

The following is a more advanced example using JWT-based authentication method.

Example of client configuration with client authentication for client signed JWT
<securityPolicy>
    <authentication>
        ...
        <modules>
            <oidc>
                <identifier>oidcKeycloak</identifier>
                <client>
                    <registrationId>keycloak</registrationId>
                    <clientId>account</clientId>
                    <clientSecret>
                        <clearValue>'client_secret'</clearValue>
                    </clientSecret>
                    <clientAuthenticationMethod>privateKeyJwt</clientAuthenticationMethod>
                    <nameOfUsernameAttribute>preferred_username</nameOfUsernameAttribute>
                    <openIdProvider>
                        <issuerUri>https://keycloak.lab.evolveum.com/auth/realms/test</issuerUri>
                    </openIdProvider>
                    <keyStoreProofKey>
                        <keyStorePath>/home/user/keystore.jks</keyStorePath>
                        <keyStorePassword>
                            <clearValue>password</clearValue>
                        </keyStorePassword>
                        <keyAlias>account</keyAlias>
                        <keyPassword>
                            <clearValue>password</clearValue>
                        </keyPassword>
                    </keyStoreProofKey>
                    <scope>profile</scope>
                    <scope>user</scope>
                </client>
            </oidc>
        </modules>
        <sequence>
            <identifier>admin-gui-default</identifier>
            <channel>
                <channelId>http://midpoint.evolveum.com/xml/ns/public/common/channels-3#user</channelId>
                <default>true</default>
                <urlSuffix>defaultGui</urlSuffix>
            </channel>
            <module>
                <identifier>oidcKeycloak</identifier>
                <order>10</order>
                <necessity>sufficient</necessity>
            </module>
        </sequence>
        ...
    </authentication>
</securityPolicy>
Since version 4.8, the flow for identifying a user logged in via the GUI has been changed. MidPoint uses the claim value with the name from the nameOfUsernameAttribute. The claim is primarily obtained from the ID token. When a claim is missing in the ID token, midPoint looks for it in the access token. Finally, if the claim is missing in the access token, midPoint uses the user info endpoint to retrieve the claim. Only the last step applies to Midpoint 4.7

If Midpoint is located behind a reverse proxy it may be useful to set the publicHttpUrlPattern setting to the right value in order for the OIDC Redirect URI to point to a valid public URL (see below).

Example of public URL configuration
<systemConfiguration>
    .
    .
    .
    <infrastructure>
        <publicHttpUrlPattern>https://public.url.local/midpoint</publicHttpUrlPattern>
    </infrastructure>
    .
    .
    .
</systemConfiguration>

Configuration for REST

Configuration for REST is provided via attribute resourceServer, that is type OidcResourceServerAuthenticationModuleType. When we want to use OIDC module for REST, midPoint works as resource server. REST request has to contain WWW-Authentication header with syntax Authorization: Bearer {token}.

Resource server contains following attributes:

Name Description Required Type Note

jwt

Define that resource server expect token in format JWT.

false

JwtOidcResourceServerType

Since midPoint 4.8.

opaqueToken

Define that resource server expect opaque token, which have to be verified by user info endpoint.

false

OpaqueTokenOidcResourceServerType

Since midPoint 4.8.

realm

Realm which midPoint use for WWW-Authentication header.

false

String

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

issuerUri

Issuer identifier URI for the OpenID Connect provider.

false

String

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

jwkSetUri

URI for the JSON Web Key (JWK) Set endpoint.

false

String

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

nameOfUsernameClaim

Name of claim in JWT, which value define name of user in midPoint.

false

String

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

singleSymmetricKey

Trusting a Single Asymmetric Key.

false

ProtectedStringType

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

trustedAlgorithm

Trusted Algorithms. (RFC7518 section-3.1).

false

String

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

trustingAsymmetricCertificate

Certificate of trusting a single asymmetric RSA public key.

false

ProtectedStringType

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

keyStoreTrustingAsymmetricKey

Key store with trusting a single asymmetric RSA public key.

false

AbstractKeyStoreKeyType

Deprecated since midPoint 4.8. Use attribute in token definition instead.
Planned removal in midPoint 4.9.

Until version 4.8 midPoint needs a JWT to authenticate and identify the midpoint. The configuration attributes used are directly in the OidcResourceServerAuthenticationModuleType.

Since version 4.8, midPoint supports two token formats, JWT (JwtOidcResourceServerType) and opaque token (OpaqueTokenOidcResourceServerType).

JWT format

When we choose the configuration for jwt(JwtOidcResourceServerType) midPoint obtains a claim, with the name from the nameOfUsernameClaim attribute, from the jwt that is contained in the request.

We have four choices for verification JWT, using issuerUri, JWKSetUri, singleSymmetricKey or using public key, by trustingAsymmetricCertificate or keyStoreTrustingAsymmetricKey.

JwtOidcResourceServerType contains following attributes:

Name Description Required Type

realm

Realm which Midpoint use for WWW-Authentication header.

false

String

issuerUri

Issuer identifier URI for the OpenID Connect provider.

false

String

jwkSetUri

URI for the JSON Web Key (JWK) Set endpoint.

false

String

nameOfUsernameClaim

Name of claim in JWT, which value define name of user in midPoint.

String

singleSymmetricKey

Trusting a Single Asymmetric Key.

false

ProtectedStringType

trustedAlgorithm

Trusted Algorithms. (RFC7518 section-3.1).

false

String

trustingAsymmetricCertificate

Certificate of trusting a single asymmetric RSA public key.

false

ProtectedStringType

keyStoreTrustingAsymmetricKey

Opaque token format

When we select the configuration for the opaqueToken(OpaqueTokenOidcResourceServerType) midPoint, we get the claim with the name from the nameOfUsernameClaim attribute from the user info endpoint.

OpaqueTokenOidcResourceServerType contains following attributes:

Name Description Required Type

realm

Realm which Midpoint use for WWW-Authentication header.

false

String

issuerUri

Issuer identifier URI for the OpenID Connect provider.

false

String

nameOfUsernameClaim

Name of claim in JWT, which value define name of user in midPoint.

String

userInfoUri

Example of Resource server configuration with issuerUri.
<securityPolicy>
    <authentication>
        ...
        <modules>
            <oidc>
                <identifier>oidcResourceServer</identifier>
                <resourceServer>
                    <jwt(or opaqueToken)>
                        <issuerUri>https://keycloak.lab.evolveum.com/auth/realms/test</issuerUri>
                        <nameOfUsernameClaim>preferred_username</nameOfUsernameClaim>
                    </jwt(or opaqueToken)>
                </resourceServer>
            </oidc>
        </modules>
        <sequence>
            <identifier>rest</identifier>
            <channel>
                <channelId>http://midpoint.evolveum.com/xml/ns/public/common/channels-3#rest</channelId>
                <default>true</default>
                <urlSuffix>rest-default</urlSuffix>
            </channel>
            <module>
                <identifier>oidcResourceServer</identifier>
                <order>10</order>
                <necessity>sufficient</necessity>
            </module>
        </sequence>
        ...
    </authentication>
</securityPolicy>
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