Authelia

1. Generate a client secret:

   authelia crypto hash generate pbkdf2 --variant sha512 --random --random.length 72 --random.charset rfc3986
   

   Random Password goes to Trilium, Digest (the $pbkdf2-sha512$…string) goes to Authelia.

2. Add a client under identity_providers.oidc.clients in Authelia's configuration.yml, replacing <server>with the URL of your Trilium instance:

   identity_providers:
     oidc:
       clients:
         - client_id: 'trilium'
           client_name: 'Trilium'
           client_secret: '<Digest>'
           public: false
           authorization_policy: 'two_factor'
           redirect_uris:
             - 'https://<server>/callback'
           scopes:
             - 'openid'
             - 'profile'
             - 'email'

   Unlike GitLab, client_id is a name you choose rather than one the provider generates.

3. Restart Authelia.

Adjust config.ini, using the Random Password from step 1:

[MultiFactorAuthentication]
oauthBaseUrl=https://<server>
oauthClientId=<ClientId>
oauthClientSecret=<RandomPassword>
oauthIssuerBaseUrl=https://<server>
oauthIssuerName=Authelia

GitLab (self-hosted or cloud)

1. Go to user settings on gitlab.com or your own self-hosted instance.
2. Press Add new application.
3. Give it a name (e.g. Trilium).
4. Set Redirect URI to https://<server>/callback
5. Make sure Confidential is checked and Device authorization grant is unchecked.
6. Under scopes, check openid, profile and email (they should be near the end).
7. Save the application and copy the Application ID and Secret.

Adjust config.ini as follows, replacing <ApplicationId>and <Secret> with the values from the last step as well as the <server> with a URL to your Trilium instance.

[MultiFactorAuthentication]
oauthBaseUrl=https://<server>
oauthClientId=<ApplicationId>
oauthClientSecret=<Secret>
oauthIssuerBaseUrl=https://gitlab.com
oauthIssuerName=GitLab
oauthClientAuthMethod=client_secret_post

Kanidm

1. Create the client, add the redirect URL and grant the scopes, replacing <server>with the URL of your Trilium instance and <group> with an existing Kanidm group whose members may sign in:

   kanidm system oauth2 create trilium "Trilium" "https://<server>"
   kanidm system oauth2 add-redirect-url trilium "https://<server>/callback"
   kanidm system oauth2 update-scope-map trilium <group> openid profile email

   The openid scope is mandatory; without it Kanidm treats the client as plain OAuth 2.0.

2. Read the client secret:

   kanidm system oauth2 show-basic-secret trilium

Adjust config.ini as follows, replacing <idm>with the URL of your Kanidm instance and <BasicSecret> with the value from step 2:

[MultiFactorAuthentication]
oauthBaseUrl=https://<server>
oauthClientId=trilium
oauthClientSecret=<BasicSecret>
oauthIssuerBaseUrl=https://<idm>/oauth2/openid/trilium
oauthIssuerName=Kanidm

The client name you chose in step 1 is both the client ID and the last path segment of the issuer URL, so the two must match.

Pocket ID

1. Sign in to Pocket ID as an administrator and go to OIDC Clients → Add OIDC Client.
2. Give it a name (e.g. Trilium).
3. Set Callback URLs to https://<server>/callback, replacing <server> with the URL of your Trilium instance.
4. Save, then copy the Client ID, Client Secret and OIDC Discovery URL.

Adjust config.ini as follows, using the values from step 4:

[MultiFactorAuthentication]
oauthBaseUrl=https://<server>
oauthClientId=<ClientID>
oauthClientSecret=<ClientSecret>
oauthIssuerBaseUrl=<OIDCDiscoveryURL>
oauthIssuerName=Pocket ID

GitHub

GitHub cannot be used as an identity provider because it is plain OAuth 2.0 and not OpenID Connect, so it will fail with OAUTH_RESPONSE_IS_NOT_CONFORM.

Google

1. Go to Google Cloud's Clients dashboard and select Create client.
2. For Application type, select Web application.
3. In Authorized redirect URIs, set  https://<server>/callback.
4. Press Create and copy Client ID and Client secret.

Adjust config.ini as follows, replacing <ClientID>and <ClientSecret> with the values from the last step as well as the <server> with a URL to your Trilium instance.

[MultiFactorAuthentication]
oauthBaseUrl=https://<server>
oauthClientId=<ClientID>
oauthClientSecret=<ClientSecret>