LangSmith Self-Hosted provides SSO via OAuth2.0 and OIDC. This will delegate authentication to your Identity Provider (IdP) to manage access to LangSmith. Our implementation supports almost anything that is OIDC compliant, with a few exceptions. Once configured, you will see a login screen like this: LangSmith UI with OAuth SSO By default, LangSmith Self-Hosted supports the Authorization Code flow with Client Secret. In this version of the flow, your client secret is stored security in the LangSmith platform (not on the frontend) and used for authentication and establishing auth sessions.

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Requirements

You may upgrade a basic auth installation to this mode, but not a none auth installation. In order to upgrade, simply remove the basic auth configuration and add the required configuration parameters as shown below. Users may then login via OAuth only. In order to maintain access post-upgrade, you must have access to login via OAuth using an email address that previously logged in via basic auth.
LangSmith does not support moving from SSO to basic auth mode in self-hosted at the moment. We also do not support moving from OAuth Mode with client secret to OAuth mode without a client secret and vice versa. Finally, we do not support having both basic auth and OAuth at the same time. Ensure you disable the basic auth configuration when enabling OAuth.
  • Your IdP must support the Authorization Code flow with Client Secret.
  • Your IdP must support using an external discovery/issuer URL. We will use this to fetch the necessary routes and keys for your IdP.
  • You must provide the OIDC, email, and profile scopes to LangSmith. We use these to fetch the necessary user information and email for your users.
  • You will need to set the callback URL in your IdP to https://<host>/api/v1/oauth/custom-oidc/callback, where host is the domain or IP you have provisioned for your LangSmith instance. This is where your IdP will redirect the user after they have authenticated.
  • You will need to provide the oauthClientId, oauthClientSecret, hostname, and oauthIssuerUrl in your values.yaml file. This is where you will configure your LangSmith instance.
  • Note: Langsmith SSO is only supported through https.
config:
  authType: mixed
  hostname: https://langsmith.example.com
  oauth:
    enabled: true
    oauthClientId: <YOUR CLIENT ID>
    oauthClientSecret: <YOUR CLIENT SECRET>
    oauthIssuerUrl: <YOUR DISCOVERY URL>
    oauthScopes: "email,profile,openid"

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Session length controls

All of the environment variables in this section are for the platform-backend service and can be added using platformBackend.deployment.extraEnv in Helm.
  • By default, session length is controlled by the expiration of the identity token returned by the identity provider
  • Most setups should use refresh tokens to enable session length extension beyond the identity token expiration up to OAUTH_SESSION_MAX_SEC, which may require including the offline_access scope by adding to oauthScopes (Helm) or OAUTH_SCOPES (Docker)
  • OAUTH_SESSION_MAX_SEC (default 1 day) can be overridden to a maximum of one week (604800)
  • For identity provider setups that don’t support refresh tokens, setting OAUTH_OVERRIDE_TOKEN_EXPIRY="true" will take OAUTH_SESSION_MAX_SEC as the session length, ignoring the identity token expiration

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Identity Provider (IdP) Setup

Google Workspace You can use Google Workspace as a single sign-on (SSO) provider using OAuth2.0 and OIDC without PKCE.
You must have administrator-level access to your organization’s Google Cloud Platform (GCP) account to create a new project, or permissions to create and configure OAuth 2.0 credentials for an existing project. We recommend that you create a new project for managing access, since each GCP project has a single OAuth consent screen.
  1. Create a new GCP project, see the Google documentation topic creating and managing projects
  2. After you have created the project, open the Credentials page in the Google API Console (making sure the project in the top left corner is correct)
  3. Create new credentials: Create Credentials → OAuth client ID
  4. Choose Web application as the Application type and enter a name for the application e.g. LangSmith
  5. In Authorized Javascript origins put the domain of your LangSmith instance e.g. https://langsmith.yourdomain.com
  6. In Authorized redirect URIs put the domain of your LangSmith instance followed by /api/v1/oauth/custom-oidc/callback e.g. https://langsmith.yourdomain.com/api/v1/oauth/custom-oidc/callback
  7. Click Create, then download the JSON or copy and save the Client ID (ends with .apps.googleusercontent.com) and Client secret somewhere secure. You will be able to access these later if needed.
  8. Select OAuth consent screen from the navigation menu on the left
    1. Choose the Application type as Internal. If you select Public, anyone with a Google account can sign in.
    2. Enter a descriptive Application name. This name is shown to users on the consent screen when they sign in. For example, use LangSmith or <organization_name> SSO for LangSmith.
    3. Verify that the Scopes for Google APIs only lists email, profile, and openid scopes. Only these scopes are required for single sign-on. If you grant additional scopes it increases the risk of exposing sensitive data.
  9. (Optional) control who within your organization has access to LangSmith: https://admin.google.com/ac/owl/list?tab=configuredApps. See Google’s documentation for additional details.
  10. Configure LangSmith to use this OAuth application. For examples, here are the config values that would be used for Kubernetes configuration:
    1. oauthClientId: Client ID (ends with .apps.googleusercontent.com)
    2. oauthClientSecret: Client secret
    3. hostname: the domain of your instance e.g. https://langsmith.yourdomain.com (no trailing slash)
    4. oauthIssuerUrl: https://accounts.google.com
    5. oauth.enabled: true
    6. authType: mixed

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Without Client Secret (PKCE) (Deprecated)

We recommend running with a Client Secret if possible (previously we didn’t support this). However, if your IdP does not support this, you can use the Authorization Code with PKCE flow. This flow does not require a Client Secret - see the flow above for the alternative that does.

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Requirements

There are a couple of requirements for using OAuth SSO with LangSmith:
  • Your IdP must support the Authorization Code with PKCE flow (Google does not support this flow for example, but see below for an alternative configuration that Google supports). This is often displayed in your OAuth Provider as configuring a “Single Page Application (SPA)”
  • Your IdP must support using an external discovery/issuer URL. We will use this to fetch the necessary routes and keys for your IdP.
  • You must provide the OIDC, email, and profile scopes to LangSmith. We use these to fetch the necessary user information and email for your users.
  • You will need to set the callback URL in your IdP to http://<host>/oauth-callback, where host is the domain or IP you have provisioned for your LangSmith instance. This is where your IdP will redirect the user after they have authenticated.
  • You will need to provide the oauthClientId and oauthIssuerUrl in your values.yaml file. This is where you will configure your LangSmith instance.
config:
  oauth:
    enabled: true
    oauthClientId: <YOUR CLIENT ID>
    oauthIssuerUrl: <YOUR DISCOVERY URL>