Auth0 + Box integration
Set up Auth0 as the identity provider for Box via SAML — for B2B SaaS products needing customer-facing Box integrations.
- Auth0 tenant admin
- Box co-admin
1. Create a new SAML 2.0 application in Auth0
In the Auth0 admin console, create a new SAML 2.0 application. Choose "Web Application" type. Note the placeholders for ACS URL + Entity ID — you'll get these from Box in step 3.
2. Get the SAML metadata URL from Auth0
Auth0 exposes the IdP metadata at a stable URL. Copy this URL — you'll paste it into Box's SSO configuration. Alternatively, download the metadata XML if Box doesn't support URL-based metadata.
3. Configure SSO in Box
In Box's admin → security → SSO settings, paste the Auth0 metadata URL (or upload the XML). Box will display the ACS URL + Entity ID it expects — copy these.
4. Return to Auth0 + complete the SAML app config
Paste Box's ACS URL into the Auth0 app's Single Sign-On URL field. Paste the Entity ID into the Audience URI field. Set the NameID format to EmailAddress (or persistent if Box expects that).
5. Configure attribute mapping
Map the attributes the SP expects (see the Attribute Mapping section below). At minimum, email is required. Most apps also expect firstName + lastName.
6. Assign users + groups
In Auth0, assign the SAML app to users or groups that should have access. Test with a pilot group before broad rollout.
7. Test end-to-end
Sign in to Box via the IdP-initiated link (from Auth0 dashboard) AND via SP-initiated (direct Box login URL). Both should work. Check the SAML Tracer browser extension or SAML decoder to inspect the assertion if anything fails.
What flows from where.
| Source (Auth0) | Target (Box) | Note |
|---|---|---|
| user.email | NameID | — |
| user.email | — |
- Clock skew: Auth0 and Box clocks must be within ~5 minutes. NTP-sync both. SAML's NotBefore + NotOnOrAfter are strict.
- NameID format mismatches are the most common failure. Box typically wants EmailAddress; Auth0 defaults vary. Mismatch → cryptic "invalid assertion" errors.
- Just-in-time (JIT) provisioning vs SCIM: many apps support both. SAML JIT creates the user on first SSO; SCIM creates them ahead of time. Pick one — both can cause attribute drift.
- Audience restriction: Box's expected Audience URI must match exactly what the IdP sends. Trailing slashes + protocol (http vs https) matter.
- Signed Response vs signed Assertion: many SPs require the Assertion to be signed (not just the Response envelope). Check the SP's docs.
- Box file-level permissions don't flow via SCIM — that's a Box API job.
- IdP-initiated SSO works (sign in from the IdP dashboard)
- SP-initiated SSO works (visit Box directly + get redirected to IdP)
- User attributes flow through correctly (email, name, groups)
- Logout (single logout if supported) works as expected
- Step-up MFA fires when policy requires it
- Unauthorized users (not assigned to the app) get a clean denied message
- Capture a successful SAML response and inspect it (use the SAML decoder tool)
For the latest vendor-side configuration changes, refer to:
Box SSO →