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Single Sign-On (SSO) Authentication

GPUStack supports Single Sign-On (SSO) authentication methods such as OIDC and SAML. This allows users to log in using their existing credentials from an external identity provider.

OIDC

Any authentication provider that supports OIDC can be configured. The email, name and picture claims are used if available. The allowed redirect URI should include <server-url>/auth/oidc/callback.

If your OIDC provider uses a certificate issued by a private or corporate CA, see Additional Trusted CAs for how to mount CA certificates into the GPUStack container.

The following CLI flags are available for OIDC configuration:

Flag
 Description
--oidc-issuer OIDC issuer URL. OIDC discovery under <issuer>/.well-known/openid-configuration will be used to discover the OIDC configuration.
--oidc-client-id OIDC client ID.
--oidc-client-secret OIDC client secret.
--oidc-redirect-uri The redirect URI configured in your OIDC application. This must be set to <server-url>/auth/oidc/callback.
--external-auth-name (Optional) Mapping of OIDC user information to username, e.g., preferred_username. By default, the email claim is used if available.
--external-auth-full-name (Optional) Mapping of OIDC user information to user's full name. Multiple elements can be combined, e.g., name or firstName+lastName. By default, the name claim is used.
--external-auth-avatar-url (Optional) Mapping of OIDC user information to user's avatar URL. By default, the picture claim is used if available.
--external-auth-default-inactive (Optional) Prevents new SSO users from being activated by default.
--external-auth-post-logout-redirect-key (Optional) Generic parameter name for post-logout redirection across different IdPs (e.g., Auth0 returnTo). Applied to both OIDC and SAML.

You can also set these options via environment variables instead of CLI flags:

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GPUSTACK_OIDC_ISSUER="your-oidc-issuer-url"
GPUSTACK_OIDC_CLIENT_ID="your-client-id"
GPUSTACK_OIDC_CLIENT_SECRET="your-client-secret"
GPUSTACK_OIDC_REDIRECT_URI="{your-server-url}/auth/oidc/callback"
# Optional
GPUSTACK_EXTERNAL_AUTH_NAME="email"
GPUSTACK_EXTERNAL_AUTH_FULL_NAME="name"
GPUSTACK_EXTERNAL_AUTH_AVATAR_URL="picture"
GPUSTACK_EXTERNAL_AUTH_DEFAULT_INACTIVE="true"
GPUSTACK_EXTERNAL_AUTH_POST_LOGOUT_REDIRECT_KEY="returnTo"  # e.g., for Auth0

Example: Integrate with Auth0 OIDC

To configure GPUStack with Auth0 as the OIDC provider:

  1. Go to auth0 and create a new application with type Regular Web Applications.

create-oidc-app

  1. Get the Domain, Client ID, and Client Secret from the application settings.

auth0-app

  1. Add <your-server-url>/auth/oidc/callback in the Allowed Callback URLs. Adapt the URL to match your server's URL.

  2. In Allowed Logout URLs, add <your-server-url>/ (or your desired post-logout URL).

auth0-callback

Then, run GPUStack with relevant OIDC configuration. The following example uses Docker with CUDA:

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sudo docker run -d --name gpustack \
    --restart=unless-stopped \
    --privileged \
    --network=host \
    --volume /var/run/docker.sock:/var/run/docker.sock \
    --volume gpustack-data:/var/lib/gpustack \
    --volume /path/to/custom-root-ca.crt:/usr/local/share/ca-certificates/custom-root-ca.crt:ro \
    --runtime nvidia \
    -e GPUSTACK_OIDC_ISSUER="https://<your-auth0-domain>" \
    -e GPUSTACK_OIDC_CLIENT_ID="<your-client-id>" \
    -e GPUSTACK_OIDC_CLIENT_SECRET="<your-client-secret>" \
    -e GPUSTACK_OIDC_REDIRECT_URI="<your-server-url>/auth/oidc/callback" \
    gpustack/gpustack

Note

The custom CA certificate mount is only required when your OIDC provider is signed by a private CA. Public OIDC providers such as Auth0 typically do not require it.

SAML

GPUStack supports SAML authentication for Single Sign-On (SSO). This allows users to log in using their existing credentials from an external identity provider that supports SAML.

The following CLI flags are available for SAML configuration:

Flag
 Description
--saml-idp-server-url SAML Identity Provider server URL.
--saml-idp-entity-id SAML Identity Provider entity ID.
--saml-idp-x509-cert SAML Identity Provider X.509 certificate.
--saml-sp-entity-id SAML Service Provider entity ID.
--saml-sp-acs-url SAML Service Provider Assertion Consumer Service URL. It should be set to <gpustack-server-url>/auth/saml/callback.
--saml-sp-x509-cert SAML Service Provider X.509 certificate.
--saml-sp-private-key SAML Service Provider private key.
--saml-idp-logout-url (Optional) SAML Identity Provider Single Logout endpoint URL.
--saml-sp-slo-url (Optional) SAML Service Provider Single Logout Service callback URL (e.g., <server-url>/auth/saml/logout/callback).
--saml-sp-attribute-prefix (Optional) SAML Service Provider attribute prefix, which is used for fetching the attributes that are specified by --external-auth-*. e.g., 'http://schemas.auth0.com/'.
--saml-security (Optional) SAML security settings in JSON format.
--external-auth-name (Optional) Mapping of SAML user information to username. You must configure the full attribute name like 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/emailaddress' or simplify with 'emailaddress' by '--saml-sp-attribute-prefix'.
--external-auth-full-name (Optional) Mapping of SAML user information to user's full name. Multiple elements can be combined. You must configure the full attribute name like 'http://schemas.xmlsoap.org/ws/2005/05/identity/claims/name' or simplify with 'name' by '--saml-sp-attribute-prefix'.
--external-auth-avatar-url (Optional) Mapping of SAML user information to user's avatar URL. You must configure the full attribute name like 'http://schemas.auth0.com/picture' or simplify with 'picture' by '--saml-sp-attribute-prefix'.
--external-auth-default-inactive (Optional) Prevents new SSO users from being activated by default.

You can also set these options via environment variables instead of CLI flags:

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GPUSTACK_SAML_IDP_SERVER_URL="https://idp.example.com"
GPUSTACK_SAML_IDP_ENTITY_ID="your-idp-entity-id"
GPUSTACK_SAML_IDP_X509_CERT="your-idp-x509-cert"
GPUSTACK_SAML_SP_ENTITY_ID="your-sp-entity-id"
GPUSTACK_SAML_SP_ACS_URL="{your-server-url}/auth/saml/callback"
GPUSTACK_SAML_SP_X509_CERT="your-sp-x509-cert"
GPUSTACK_SAML_SP_PRIVATE_KEY="your-sp-private-key"
# Optional
GPUSTACK_SAML_SP_ATTRIBUTE_PREFIX="http://schemas.auth0.com/"
GPUSTACK_SAML_SECURITY="{}"
GPUSTACK_EXTERNAL_AUTH_NAME="emailaddress"
GPUSTACK_EXTERNAL_AUTH_FULL_NAME="name"
GPUSTACK_EXTERNAL_AUTH_AVATAR_URL="picture"
GPUSTACK_EXTERNAL_AUTH_DEFAULT_INACTIVE="true"
GPUSTACK_SAML_IDP_LOGOUT_URL="https://idp.example.com/saml/slo"  # if IdP supports SLO
GPUSTACK_SAML_SP_SLO_URL="{your-server-url}/auth/saml/logout/callback"
GPUSTACK_EXTERNAL_AUTH_POST_LOGOUT_REDIRECT_KEY="returnTo"  # optional, adds a post-logout parameter for compatible IdPs

Example: Integrate with Auth0 SAML

To configure GPUStack with Auth0 as the SAML provider:

  1. Go to auth0 and create a new application with type Regular Web Applications.

create-saml-app

  1. Get the Domain from the application settings and add <your-server-url>/auth/saml/callback in the Allowed Callback URLs. Adapt the URL to match your server's URL.

auth0-saml-callback

  1. In Advanced Settings → Certificates, copy the IdP X.509 Certificate.

auth0-saml-cert

  1. In Endpoints tab, find the SAML Protocol URL, which is your IdP server URL.

auth0-saml-url

  1. Generate SP certificate and private key:
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openssl req -x509 -newkey rsa:2048 -keyout myservice.key -out myservice.cert -days 365 -nodes -subj "/CN=myservice.example.com"

Note

myservice.cert and myservice.key will be used for the SP configuration.

  1. Run GPUStack with relevant SAML configuration. The following example uses Docker with CUDA:
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SP_CERT="$(cat myservice.cert)"
SP_PRIVATE_KEY="$(cat myservice.key)"
SP_ATTRIBUTE_PREFIX="http://schemas.auth0.com/"

sudo docker run -d --name gpustack \
    --restart=unless-stopped \
    --privileged \
    --network=host \
    --volume /var/run/docker.sock:/var/run/docker.sock \
    --volume gpustack-data:/var/lib/gpustack \
    --runtime nvidia \
    -e GPUSTACK_SAML_IDP_SERVER_URL="<auth0-saml-protocol-url>" \
    -e GPUSTACK_SAML_IDP_ENTITY_ID="urn:<auth0-domain>" \
    -e GPUSTACK_SAML_IDP_X509_CERT="<auth0-x509-cert>" \
    -e GPUSTACK_SAML_SP_ENTITY_ID="urn:gpustack:sp" \
    -e GPUSTACK_SAML_SP_ACS_URL="<your-gpustack-server-url>/auth/saml/callback" \
    -e GPUSTACK_SAML_SP_X509_CERT="$SP_CERT" \
    -e GPUSTACK_SAML_SP_PRIVATE_KEY="$SP_PRIVATE_KEY" \
    -e GPUSTACK_SAML_SP_ATTRIBUTE_PREFIX="$SP_ATTRIBUTE_PREFIX" \
    -e GPUSTACK_SAML_IDP_LOGOUT_URL="<idp-slo-url-if-available>" \
    -e GPUSTACK_SAML_SP_SLO_URL="<your-gpustack-server-url>/auth/saml/logout/callback" \
    -e GPUSTACK_EXTERNAL_AUTH_POST_LOGOUT_REDIRECT_KEY="returnTo" \
    gpustack/gpustack

Note

Not all IdPs provide standard SAML Single Logout (SLO). Auth0 SAML connections commonly do not expose singleLogoutService. If unavailable, GPUStack will still clear local sessions on logout; for full browser sign-out with Auth0, consider using its OIDC v2/logout with client_id and returnTo allowed.