You can use your Okta credentials to sign in to HackerOne. To set up SSO via SAML for Okta:
Log in to Okta.
Click the Applications > Applications
Click Create App Integration
Select SAML 2.0 and click Next
Give the APP a name and optionally a logo and click Next
Fill in the next SAML Settings values
Single sign-on URL: https://hackerone.com/users/saml/auth
Audience URI (SP Entity ID): hackerone.com
Name ID format: EmailAddress
Application username: Email
Add the following three Attribute Statements
User.firstName, Unspecified, user.firstName
User.lastName, Unspecified, user.lastName
User.email, Unspecified, user.email
Update application username on: Create and update
Click Next
On step 3 select: This is an internal app that we have created.
Click Finish.
Click View SAML setup instructions on the Sign On tab to see the SAML 2.0 config values. Keep this page open for setting up SAML for HackerOne in the later steps.
Open HackerOne in a new tab.
Follow the SAML setup instructions here.
Copy the Single Sign-On URL and the Signing Certificate from the “Sign On settings” page that you accessed in step 10 and paste them into the corresponding fields during setup.
In OKTA you can Assign the HackerOne application to the people or groups that should have access to the application on the Assignments tab.